CN108931141A

CN108931141A - A kind of technique for realizing inexpensive denitration using sinter waste-heat sintered discharge gas

Info

Publication number: CN108931141A
Application number: CN201710367513.XA
Authority: CN
Inventors: 周志安; 王兆才; 谭诚; 李文林; 储太山; 贺新华; 代友训; 李康
Original assignee: Zhongye Changtian International Engineering Co Ltd
Current assignee: Zhongye Changtian International Engineering Co Ltd
Priority date: 2017-05-23
Filing date: 2017-05-23
Publication date: 2018-12-04
Anticipated expiration: 2037-05-23
Also published as: CN108931141B

Abstract

The present invention provides a process for using sinter waste heat to heat sinter waste gas to realize low-cost denitrification. The flue gas with high _NOx concentration in the flue gas of the sintering machine is input into the cooling system as a cooling medium to cool the sintering ore. This part of the flue gas of the sintering machine After passing through the cooling system, the temperature can be raised to 260-480°C, and then this part of the flue gas is input into the denitrification system for denitrification treatment, and then waste heat utilization, dust removal, and desulfurization treatment are performed to meet the emission requirements; at the same time, the concentration of _NOx in the flue gas of the sintering machine The lower flue gas can directly meet the emission requirements after waste heat utilization, dust removal and desulfurization treatment, thereby reducing the flue gas treatment capacity of the denitrification system. The system of the present invention effectively utilizes the waste heat of the sintering ore in the cooling system, makes the sintering flue gas reach the temperature required in the denitrification system, realizes energy saving and emission reduction, and simultaneously realizes the operating cost of sintering flue gas treatment.

Description

A kind of technique for realizing inexpensive denitration using sinter waste-heat sintered discharge gas

Technical field

The present invention relates to a kind of sintering flue gas denitrating techniques, and in particular to a kind of to utilize sinter waste-heat sintered discharge gas The technique for realizing inexpensive denitration belongs to sinter sintering, field of waste heat utilization.

Background technique

Steel and iron industry is basis and the pillar industry of Chinese national economy, and China's smelting iron and steel is with " sintering (pelletizing) is burnt Based on the long process of change-blast furnace-converter ", 75% or more blast furnace burden derives from sinter, and annual output has reached nearly 1,000,000,000 Ton, it is seen that sintering production plays a crucial role in terms of raw material preparation before ironmaking.Meanwhile sintering process is also steel stream Link is concentrated in high energy consumption, high pollution in journey, and energy consumption accounts for the 10% of Ferrous Metallurgy total energy consumption, and it is total that the exhausted air quantity of discharge accounts for steel and iron industry The 50% of exhausted air quantity, micron order particle dust, SO in exhaust gas_x、NO_x, persistent organism, the pollutants such as heavy metal discharge Occupy steel and iron industry first place.

Substantially sintering plant all has been provided with desulphurization system at present, but denitrating system improves or compare not enough desulfurization skill Art is not mature enough.Gas denitrifying technology is mainly by NO_xIt is handled, makes water and nitrogen or to NO_xAdsorbed, Minimizing processing.Denitration technology is divided into dry and wet, mainly there is gas-phase reaction method, liquid adsorption method, absorption method, liquid film Method, microbial method etc..What wherein denitration efficiency highest, technology were the most mature is selective catalytic reduction (SCR) process, selectivity Catalytic reduction method (SCR) is a kind of effective flue-gas denitration process, and system run all right, denitration efficiency is up to 90%.SCR Technique is to spray into ammonia containing NO_xIn flue gas, under the effect of the catalyst by toxic NO_xIt is reduced to nontoxic N₂.But SCR skill The suitable reaction temperature window that art needs is 260~480 DEG C, and reaction temperature is excessively high, and catalyst can generate crystalline polamer and be poisoned Failure；Reaction temperature is too low, catalyst it is active and lower.Because of the limitation of temperature, the SCR catalyst of present broad commercial applications Reactor is arranged in front of deduster, but because of dust impurities toxic action, leads to the service life serious curtailment of catalyst.And When flue-gas temperature is lower, it is necessary to be handled after being heated to flue gas using SCR, since exhaust gas volumn is huge, in denitration Mine per ton about needs 3.81kg mark coal for heating flue gas in journey, and operating cost is higher.

The sintering flue gas temperature that sintering machine generates is generally 130-180 DEG C, and requiring heat to 260~480 DEG C just can enter To denitrating system, need to consume a large amount of energy.About 700 DEG C of mean temperature of heat sinter of sintering machine firing is broken via single roller Enter ring type after broken or straight line cooler carries out air blast or exhausting is cooling, cooling procedure generates a large amount of hot waste gas, cooling system A large amount of cooling medium is needed, cooling medium carries out heat exchange after cooling system, with sinter, can achieve 400 DEG C of left sides The right side, in order to cool down sinter, it is desirable to provide a large amount of cooling medium.

Summary of the invention

In order to reduce sintering flue gas end treatment total amount, utilization rate of complementary energy in sintering system is improved, SCR technology application is solved In the high hard nut to crack of sintering denitration operating cost, the present invention provides a kind of utilization sinter waste-heat sintered discharge gas realization The technique of denitration, by NO in sintering device flue gas_xThe higher flue gas of concentration inputs cooling system, cooling sintering as cooling medium Mine, this partially sinters machine flue gas can be warming up to 260~480 DEG C after cooling system, then this part of smoke is inputted and is taken off Denitration process is carried out in nitre system, UTILIZATION OF VESIDUAL HEAT IN, dedusting, desulfurization process is then carried out, to reach emission request；It is sintered simultaneously NO in machine flue gas_xAfter the lower flue gas of concentration carries out desulfurization process after UTILIZATION OF VESIDUAL HEAT IN, dedusting, it directly can achieve discharge and want It asks, to reduce the treating capacity of denitrating system.The waste heat of sinter in cooling system is effectively utilized in system of the invention, So that sintering flue gas reaches the temperature required in desulphurization system, smoke gas treatment cost has been saved while realizing energy-saving and emission-reduction.

In this application, " optional " expression carries out or without or indicating to be with or without.

The first embodiment provided according to the present invention provides a kind of utilization sinter waste-heat sintered discharge gas realization The system of inexpensive denitration.

A kind of system for realizing inexpensive denitration using sinter waste-heat sintered discharge gas, the system include：

The trolley lower section of sintering machine, the sintering machine is equipped with multiple bellows；

The non-denitration flue and denitration flue being equipped with below sintering machine,

Cooling system, and

Denitrating system；

Wherein, the direction according to mineral aggregate operation on sintering machine, these bellows of sintering machine are divided into 5 sections, first area Section includes 2-4 bellows, and second section includes 2-3 bellows, and third section includes 8-22 bellows (preferably 12-18 It is a), the 4th section includes 2-3 bellows, and the 5th section includes 4-6 bellows；

Each bellows for belonging to first section are connected to non-denitration flue by respective wind box branch pipe, belong to second Each bellows of a section are respectively connected to non-denitration in a manner of changeable respective wind box branch pipe and respective switching valve Flue or denitration flue, each bellows for belonging to third section are connected to denitration flue gas by respective wind box branch pipe Pipeline, each bellows for belonging to the 4th section are distinguished in a manner of changeable respective wind box branch pipe and respective switching valve It is connected to non-denitration flue or denitration flue, each bellows for belonging to the 5th section are connected by respective wind box branch pipe It is connected to non-denitration flue；

Non- denitration flue is after the first deduster, by the cigarette for being connected to the first desulphurization system after the first exhaust fan Gas entrance, the exhanst gas outlet of the first desulphurization system are connected to the first chimney；

After denitration flue passes through the second deduster, the air inlet of cooling system is connected to by the first smoke conveying duct Mouthful, the air outlet of cooling system is connected to the smoke inlet of denitrating system by the second smoke conveying duct；

The exhanst gas outlet of denitrating system is connected to the smoke inlet of the first waste-heat recovery device, the first waste-heat recovery device Exhanst gas outlet is connected to the smoke inlet of the first desulphurization system or the second desulphurization system, the second desulfurization system after third deduster The exhanst gas outlet of system is connected to the first chimney or the second chimney.

In the present invention, the number of the bellows of sintering machine n=18-38, preferably n=22-34, more preferable n=26-30 It is a.

Preferably, the number of the bellows of sintering machine n=28, first section includes 3 bellows, second section packet 2 bellows are included, third section includes 16 bellows, and the 4th section includes 2 bellows, and the 5th section includes 5 bellows.

In the present invention, the cooling system is vertical cooling machine.

Preferably, the first smoke conveying duct is equipped with the second exhaust fan and the first air blower.Preferably, it second takes out Blower and the first air blower are successively set on the first smoke conveying duct after the second deduster.

In the present invention, the cooling system is circular cooler.Circular cooler includes high temperature section, middle-temperature section and low temperature Section.After denitration flue passes through the second deduster, it is connected to the air inlet of circular cooler high temperature section.It is set above high temperature section There is ring cold machine high temperature section fan housing.The smoke inlet of the air outlet connection denitrating system of ring cold machine high temperature section fan housing.

Preferably, the first smoke conveying duct is equipped with third exhaust fan.

Preferably, seal closure is equipped with above the trolley of sintering machine.Generally, seal closure is arranged on the igniting of sintering machine After area.The air inlet of circular cooler low-temperature zone is communicated with atmosphere.The top of low-temperature zone is equipped with ring cold machine low-temperature zone fan housing.Ring The air inlet of formula cooler middle-temperature section communicates with atmosphere and/or by ring cold machine low-temperature zone flue and ring cold machine low-temperature zone wind The air outlet of cover connects.The top of middle-temperature section is equipped with ring cold machine middle-temperature section fan housing.The air outlet of ring cold machine middle-temperature section fan housing passes through Ring cold machine middle-temperature section flue is connected to the seal closure above sintering machine or communicates with atmosphere.When sintering machine break down or its His situation, when the flue gas of ring cold machine middle-temperature section cannot be delivered to sintering machine, the air outlet of ring cold machine middle-temperature section fan housing and big gas phase It is logical, guarantee the normal operation of ring cold machine.

Preferably, seal closure is equipped with skylight.When ring cold machine failure or other situations, ring cold machine middle-temperature section do not have When cooling medium is discharged, the skylight above seal closure is opened, guarantees that sintering machine operates normally.

Preferably, the second smoke conveying duct is equipped with the 4th deduster.

Preferably, the flue gas that the second smoke conveying duct is connected to denitrating system after third waste-heat recovery device enters Mouthful.After sintering flue gas carries out heat exchange with sinter in a cooling system, when the temperature of sintering flue gas is more than 480 DEG C, the temperature Degree has been more than the best catalytic temperature of catalyst in denitrating system, this can be partially sintered to flue gas and first carry out UTILIZATION OF VESIDUAL HEAT IN, so It is transported to denitrating system again afterwards.Heat can be recycled in this way and protects the catalyst in denitrating system.When sintering flue gas is cold But after carrying out heat exchange with sinter in system, when the temperature of sintering flue gas is no more than 480 DEG C, it is direct that this is partially sintered into flue gas It is transported to denitrating system.

Preferably, non-denitration flue is equipped with the first temperature monitor and concentration detector.Denitration flue It is equipped with second temperature detector.

Preferably, the exhanst gas outlet of the first waste-heat recovery device is connected after third deduster by the 5th exhaust fan To the smoke inlet of the first desulphurization system or the second desulphurization system.

Preferably, the wind box branch pipe connecting with each bellows for belonging to the 5th section is all connected directly to the conveying of third flue gas Pipeline, via being connected to non-denitration flue after the 4th exhaust fan.

Preferably, third smoke conveying duct is equipped with the second waste-heat recovery device.

Preferably, the second smoke conveying duct is equipped with third temperature monitor.

Preferably, the first deduster and third deduster are electric precipitator.Second deduster is multi-tube dust cleaner.4th Deduster is hot precipitator.

Preferably, the system includes 2-5 root denitration flue.Every denitration flue is via the second deduster Afterwards, the air inlet of cooling system is connected to by the first smoke conveying duct, the air outlet of cooling system is defeated by the second flue gas Send the smoke inlet of pipeline connection denitrating system；The flue gas that the exhanst gas outlet of denitrating system is connected to the first waste-heat recovery device enters Mouthful, the exhanst gas outlet of the first waste-heat recovery device is connected to the first desulphurization system or the second desulphurization system after third deduster Smoke inlet, the exhanst gas outlet of the second desulphurization system is connected to the first chimney or the second chimney.

Second of the embodiment provided according to the present invention provides a kind of utilization sinter waste-heat sintered discharge gas realization The technique of inexpensive denitration.

A kind of technique for realizing inexpensive denitration using sinter waste-heat sintered discharge gas, which includes following step Suddenly：

1) cloth, igniting：The mixture prepared is packed on sintering pallet and is lighted a fire, starts to be sintered；

2) multi-steps sintering：Sinter carries out multi-steps sintering on sintering machine；Multiple wind are equipped with below the trolley of the sintering machine Case, sintering machine lower section are equipped with non-denitration flue and denitration flue, according to the direction of mineral aggregate operation on sintering machine, sintering These bellows of machine are divided into 5 sections, and first section includes 2-4 bellows, and second section includes 2-3 bellows, third A section includes 8-22 bellows (preferably 12-18), and the 4th section includes 2-3 bellows, and the 5th section includes 4-6 Bellows；

The flue gas for belonging to each bellows of first section is delivered to non-denitration flue by respective wind box branch pipe, belongs to Distinguished in a manner of changeable in the flue gas of each bellows of second section respective wind box branch pipe and respective switching valve It is delivered to non-denitration flue or denitration flue, the flue gas for belonging to each bellows of third section passes through respective bellows Branch pipe is delivered to denitration flue, belongs to the flue gases of each bellows of the 4th section and passes through respective wind box branch pipe and respective Switching valve is delivered to non-denitration flue or denitration flue in a manner of changeable respectively, belongs to each of the 5th section The flue gas of bellows is delivered to non-denitration flue by respective wind box branch pipe；

3) sinter is cooling：Cooling system is transported to by the sintered sinter of sintering machine to be cooled down；

4) non-denitration flue fume treatment：Flue gas in non-denitration flue passes through the first deduster dedusting, by First exhaust fan is delivered to the first desulphurization system and carries out desulfurization, and the flue gas after desulfurization passes through from the exhanst gas outlet of the first desulphurization system First smoke stack emission；

5) denitration flue fume treatment：Flue gas in denitration flue passes through after the second deduster dedusting First smoke conveying duct is delivered to cooling system and is cooled down, in cooling system, flue gas in denitration flue with it is cold But the sinter in system carries out heat exchange, so that the partial fume heats up, (temperature reaches 260- to the flue gas after being heated up 480 DEG C), the flue gas after heating, which enters, carries out denitration in denitrating system, the flue gas after denitration is arranged from the exhanst gas outlet of denitrating system It out and is delivered in the first waste-heat recovery device by the second smoke conveying duct and carries out UTILIZATION OF VESIDUAL HEAT IN, the cigarette after UTILIZATION OF VESIDUAL HEAT IN is complete Gas is then sent to the first desulphurization system or the second desulphurization system carries out desulfurization process optionally past third deduster dedusting, Flue gas after desulfurization is from from the first chimney or the second smoke stack emission.

Preferably, the cooling system is vertical cooling machine.

Preferably, the cooling system is circular cooler.Circular cooler includes high temperature section, middle-temperature section and low temperature Section.It is cold that flue gas in denitration flue is delivered to ring type after the second deduster dedusting, through the first smoke conveying duct But the air inlet of machine high temperature section.The top of high temperature section is equipped with ring cold machine high temperature section fan housing.After high temperature section, flue gas is from ring cold machine The air outlet of high temperature section fan housing is discharged and is transported to the smoke inlet of denitrating system.

Preferably, the first smoke conveying duct is equipped with third exhaust fan.

Preferably, being equipped with seal closure above the trolley of sintering machine.Generally, seal closure is arranged on after seed region.It is low The top of temperature section is equipped with ring cold machine low-temperature zone fan housing.The top of middle-temperature section is equipped with ring cold machine middle-temperature section fan housing.Cooling wind is from ring type The air inlet of cooler low temperature section enters low-temperature zone.It is discharged and leads to from the air outlet of ring cold machine low-temperature zone fan housing after cooling wind heat exchange Cross the air inlet that ring cold machine low-temperature zone flue is delivered to circular cooler middle-temperature section.Cooling wind is cold from ring after middle-temperature section The air outlet of machine middle-temperature section fan housing be discharged and pass through seal closure that ring cold machine middle-temperature section flue is delivered to above sintering machine or It is communicated with atmosphere.When sintering machine failure or other situations, when the flue gas of ring cold machine middle-temperature section cannot be delivered to sintering machine, ring The air outlet of cold middle-temperature section fan housing is communicated with atmosphere, guarantees the normal operation of ring cold machine.

Preferably seal closure is equipped with skylight.When ring cold machine failure or other situations, ring cold machine middle-temperature section do not have When cooling medium is discharged, the skylight above seal closure is opened, guarantees that sintering machine operates normally.

Preferably, ring cold machine low-temperature zone flue is equipped with cold air inlet.Optionally from cold air inlet toward ring cold machine Low-temperature zone flue input air.

Preferably, the second smoke conveying duct is equipped with the 4th deduster.It is discharged from the exhanst gas outlet of cooling system Flue gas is taken off by the smoke inlet that the second smoke conveying duct is delivered to denitrating system again after the 4th deduster dedusting Nitre processing.

Preferably, the second smoke conveying duct is equipped with third waste-heat recovery device.When sintering flue gas is in cooling system In with sinter carry out heat exchange after, when the temperature of sintering flue gas is more than 480 DEG C, which has been more than catalyst in denitrating system Best catalytic temperature, this can be partially sintered to flue gas and first carry out UTILIZATION OF VESIDUAL HEAT IN, be then transported to denitrating system again.So both Heat can be recycled, and the catalyst in denitrating system can be protected.When sintering flue gas carries out hot friendship with sinter in a cooling system After changing, when the temperature of sintering flue gas is no more than 480 DEG C, this is partially sintered into flue gas and is delivered directly to denitrating system.

Preferably, non-denitration flue is equipped with the first temperature monitor and concentration detector.First temperature detection Instrument detects the temperature of non-denitration flue flue gas.Concentration detector detects the NO of non-denitration flue flue gas_xConcentration.Denitration Flue is equipped with second temperature detector.The temperature of flue gas in second temperature detector test denitration flue.

Preferably, the flue gas for belonging to each bellows of the 5th section is directly transported by the wind box branch pipe connected on each bellows To third smoke conveying duct, it is conveyed through after the 4th exhaust fan by third smoke conveying duct and is transported to non-denitration flue gas Pipeline.

Preferably, third smoke conveying duct is equipped with the second waste-heat recovery device.The cigarette of each bellows of 5th section Gas is delivered to non-denitration flue after the second waste-heat recovery device UTILIZATION OF VESIDUAL HEAT IN.

Preferably, the second smoke conveying duct is equipped with third temperature monitor.Third temperature monitor detection second The temperature of flue gas in smoke conveying duct.

Preferably, the technique uses 2-5 root denitration flue.The flue gas of every denitration flue is removed by second After dirt device, the air inlet of cooling system is delivered to by the first smoke conveying duct, the cigarette being discharged from the air outlet of cooling system Gas is delivered to the smoke inlet of denitrating system by the second smoke conveying duct；The flue gas being discharged from the exhanst gas outlet of denitrating system It is transported to the smoke inlet of the first waste-heat recovery device, the flue gas being discharged from the exhanst gas outlet of the first waste-heat recovery device passes through The smoke inlet of the first desulphurization system or the second desulphurization system is transported to after third deduster, from the first desulphurization system or second The flue gas of the exhanst gas outlet discharge of desulphurization system is transported to the first chimney or the second chimney.

Preferably, being additionally provided with control system.Control system connects and controls switching valve, the first temperature monitor, second Temperature monitor, third temperature monitor, concentration detector.

In the present invention, control system controls：The temperature of flue gas is 100-160 DEG C in non-denitration flue, preferably 110-150 DEG C, more preferably 120-140 DEG C.

In the present invention, control system controls：The NO of non-denitration flue flue gas_xConcentration is less than 200mg/m³, preferably Less than 180mg/m³, more preferably less than 150mg/m³。

In the present invention, control system controls：The temperature of flue gas is 80-150 DEG C in denitration flue, preferably 90- 140 DEG C, more preferably 100-120 DEG C.

In the present invention, control system controls：The temperature of flue gas is 260-480 DEG C in second smoke conveying duct, preferably It is 300-460 DEG C, more preferably 320-450 DEG C.

In the present invention, belong to each bellows of second section by respective wind box branch pipe and respectively by the way that control is discharged Switching valve be respectively connected to non-denitration flue or denitration flue in a manner of changeable, and, belong to the 4th area Each bellows of section are respectively connected to non-denitration flue gas in a manner of changeable respective wind box branch pipe and respective switching valve Pipeline or denitration flue, guarantee following purpose：(1) guarantee that denitration flue flue-gas temperature is not less than 80 DEG C；If denitration cigarette Road flue-gas temperature is lower than 80 DEG C, adjusts each bellows branch of the switching valve and the 4th section on each wind box branch pipe of second section Switching valve on pipe, successively increasing the flue gas in bellows from sintering device handpiece and/or tail direction and enter denitration independently Flue, to enter the raising that denitration flue realizes flue-gas temperature by increasing high-temperature flue gas, so that denitration flue flue-gas temperature Not less than 80 DEG C.Due to containing a small amount of SO in denitration flue flue gas₂, the temperature of flue gas in denitration flue is controlled, acid dew is higher than Point, it is ensured that denitration flue does not condense.(2) guarantee NO in non-denitration flue flue gas_xConcentration≤200mg/m³；It is non-de- in order to make Flue gas in smoke of gunpowder road can achieve the requirement of direct emission after desulfurization process, it is necessary to control in non-denitration flue flue gas NO_xConcentration≤200mg/m³；If NO in non-denitration flue flue gas_xConcentration is higher than 200mg/m³, adjust each wind of second section Switching valve on case branch pipe and the switching valve on each wind box branch pipe of the 4th section, independently successively from sintering device handpiece And/or tail direction reduces the flue gas in bellows and enters non-denitration flue, to realize reduction containing NO_xHighly concentrated flue gas enters Non- denitration flue, so that NO in non-denitration flue flue gas_xConcentration is lower than 200mg/m³.(3) guarantee sintering flue gas as thermal sintering cake After cooling medium, heatrejection be in 260-480 DEG C, in cooling system sintering flue gas by with after sinter heat exchange, Temperature reaches 260-480 DEG C, this temperature is the temperature of catalyst denitrating flue gas in optimum and denitrating system.(4) guarantee Total system air balance；By the circulation of cooling medium in control cooling system, control sintering device flue gas enters cooling system Air quantity realizes cooling system zero-emission.(5) guarantee that non-denitration flue flue-gas temperature is not higher than 160 DEG C；Belong to each of the 5th section The flue gas of bellows is then connected to non-denitration flue after the second waste-heat recovery device, so that non-denitration flue flue-gas temperature Not higher than 160 DEG C, while protecting desulphurization system, increase UTILIZATION OF VESIDUAL HEAT IN, save the cost.(6) guarantee when entering cooling system de- Smoke of gunpowder road flue-gas temperature is not higher than 150 DEG C (preferably 130 DEG C), it is ensured that cooling effect of the sinter in cooling system.

In the present invention, it is calculated through air balance and concentration balance, it is in the case where meeting above-mentioned design premises, conventional sintering is double Flue is changed to three flues or Multi-flue, 31% low NO_xFlue gas is into non-denitration flue, then after electric precipitator, desulphurization system By chimney outlet；The high NO of residue 69%_xThen the flue gas mean allocation denitration flue parallel to other two is used as thermal sintering The cooling medium of cake, through heat exchange heating after enter denitrating system, and after after residual neat recovering system, electric precipitator, desulphurization system By chimney outlet.

In the present invention, be respectively set at the top of circular cooler ring cold machine high temperature section fan housing, ring cold machine middle-temperature section fan housing, Ring cold machine low-temperature zone fan housing, it is ensured that ring cold machine does not leak out, and three sections of flue gas carries out UTILIZATION OF VESIDUAL HEAT IN respectively on ring cold machine, Realize the zero-emission of ring cold machine.

In the present invention, it is equipped with the 4th deduster before denitrating system SCR device, reduces the dust carried in flue gas, subtracts What the catalyst in few SCR was subject to washes away and wears.

In the present invention, multiple bellows are set gradually under sintering machine from firing tip to tail end, due under ignition furnace sintering and Sintering at sintering machine tail end, generate flue gas in NO_xLess (partial fume account for about amount of flue gas emission 30%), in Being will be non-de- by one positioned at the flue gas in several bellows at the flue gas and sintering machine tail end in several bellows below ignition furnace Smoke of gunpowder road is taken away by blower, and wherein the flue gas at sintering machine tail end in several bellows first passes through a waste-heat recovery device and dropped Temperature, then again with the flue gas in several bellows below ignition furnace together after electric precipitator, desulphurization system by chimney outlet (NO_xConcentration is less than 200mg/m³)；By the flue gas distribution (preferably mean allocation) in the bellows of the remaining interlude of sintering machine to two A denitration flue (flue is preferably arranged in parallel) is taken away by blower.

In the present invention, will be taken away through denitration flue and flue gas after dedusting sinter is carried out as cooling medium it is cold But, which is blasted in sintering ore cooling device by air blower, the flue gas is while cooling sinter, own temperature quilt It increases, sintering ore cooling device exhanst gas outlet keeps tiny structure at this time, and adds petticoat pipe, and the flue gas after being warmed is needed from sintering Mine cooling device exhanst gas outlet is pumped.

In the present invention, the first smoke conveying duct is equipped with the second exhaust fan and the first air blower, avoids delivery pipe The problem of causing flue gas conveying to be obstructed greatly due to pressure difference in road.

In the present invention, the air outlet of ring cold machine middle-temperature section fan housing is connected to sintering by ring cold machine middle-temperature section flue Seal closure above machine enters the flue gas of ring cold machine middle-temperature section in sintering machine, is further reduced whole system exhaust gas Outer discharge capacity, while using the sensible heat of ring cold machine middle-temperature section flue gas, increase the utilization rate of thermal energy.

Compared with prior art, the present invention has following advantageous effects：

1, using technique of the invention, sintering flue gas enters back into denitration system after cooling system and sinter are exchanged heat System does not have to containing NO_xFlue gas is additionally heated, and is reduced using SCR denitration cost；

2, in present invention process, sintering flue gas is used as cooling medium cold sinter in cooling system, contains NO_xFlue gas exists It is heated while cooling sinter, improves sinter utilization rate of waste heat；

3, it is equipped with the 4th deduster before denitrating system SCR device, the service life of catalyst in SCR denitration system can be extended；

4, when being cooled down using perpendicular cold to sinter, sintering ore cooling device smoke outlet setting petticoat pipe is simultaneously kept Tiny structure, the cooling air leak rate of air curtain of sinter is greatly reduced, while being also conducive to contain NO_xNO is not present in the heating of flue gas_xAnd SO₂Inorganization The problem of discharge, not will cause environmental pollution；

5, in present invention process, the flue gas in the bellows of sintering machine tail portion carries out UTILIZATION OF VESIDUAL HEAT IN by waste-heat recovery device, Flue gas after denitration simultaneously carries out UTILIZATION OF VESIDUAL HEAT IN also by waste-heat recovery device, and UTILIZATION OF VESIDUAL HEAT IN is further greatly improved in this way Rate；

6, in present invention process, since sintering machine sintering process is divided into three sections, the selection of corresponding each section of blower is more For miniaturization, full factory's whole power consumption is reduced and capital investment of founding the factory；

7, when being cooled down using ring cold machine to sinter, the cooling medium after heat exchange can be all of realization The zero-emission of ring cold machine.

Detailed description of the invention

Fig. 1 is that the present invention is illustrated using the process of the technique of the inexpensive denitration of sinter waste-heat sintered discharge gas realization Figure；

Fig. 2 is the structural schematic diagram that cooling system is vertical cooling machine in present system；

Fig. 3 is the structural schematic diagram that cooling system is circular cooler in present system；

Fig. 4 is another design for the system that the present invention realizes inexpensive denitration using sinter waste-heat sintered discharge gas Structural schematic diagram；

Fig. 5 is smoke components and content characteristics figure in each bellows of sintering machine in the prior art；

Fig. 6 is the partial enlargement diagram of sintering machine in the present invention；

Fig. 7 is control system control schematic diagram of the present invention.

Appended drawing reference：1：Sintering machine；101：Bellows；102：Wind box branch pipe；103：Seal closure；201：First deduster； 202：Second deduster；203：Third deduster；204：4th deduster；301：First exhaust fan；302：Second exhaust fan； 303：Third exhaust fan；304：4th exhaust fan；305：5th exhaust fan；401：First desulphurization system；402：Second desulfurization system System；501：First chimney；502：Second chimney；6：Cooling system；601：The air inlet of cooling system；602：Cooling system goes out Air port：7：Denitrating system；701：The smoke inlet of denitrating system；702：The exhanst gas outlet of denitrating system；8：Vertical cooling machine；9： Circular cooler；901：High temperature section；902：Middle-temperature section；903：Low-temperature zone；904：Ring cold machine high temperature section fan housing；905：In ring cold machine Temperature section fan housing；906：Ring cold machine low-temperature zone fan housing；1001：First air blower；11：First waste-heat recovery device；1101：More than first The smoke inlet of heat recovery apparatus；1102：The exhanst gas outlet of first waste-heat recovery device；1103：Second waste-heat recovery device； 1104：Third waste-heat recovery device；12：Skylight；13：Switching valve；1401：First temperature monitor；1402：Second temperature detection Instrument；1403：Third temperature monitor；15：Concentration detector；16：Cold air inlet；L1：Non- denitration flue；L2：Denitration cigarette Feed channel；L3：First smoke conveying duct；L4：Second smoke conveying duct；L5：Ring cold machine low-temperature zone flue；L6：Ring Cold middle-temperature section flue；L7：Third smoke conveying duct；T1：The temperature of flue gas in non-denitration flue；T2：Denitration The temperature of flue gas in flue；T3：The temperature of flue gas in second smoke conveying duct；P：Flue gas in non-denitration flue NO_xConcentration；K：Control system.

Specific embodiment

It should be noted that in the accompanying drawings in order to be conducive to see clearly important feature part and the process in attached drawing, attached drawing 1-4 In sintering machine wind box number using simplified signal diagramatic way, the specific number of practical upper bellows should be more.

The trolley lower section of sintering machine 1, the sintering machine 1 is equipped with multiple bellows 101；

The non-denitration flue L1 and denitration flue L2 being equipped with below sintering machine 1,

Cooling system 6, and

Denitrating system 7；

Wherein, the direction according to mineral aggregate operation on sintering machine 1, these bellows of sintering machine 1 are divided into 5 sections, and first Section includes 2-4 bellows, and second section includes 2-3 bellows, and third section includes 8-22 bellows (preferably 12-18 It is a), the 4th section includes 2-3 bellows, and the 5th section includes 4-6 bellows；

Each bellows 101 for belonging to first section are connected to non-denitration flue L1 by respective wind box branch pipe 102, Belong to each bellows 101 of second section respective wind box branch pipe 102 and respective switching valve 13 in a manner of changeable It is respectively connected to non-denitration flue L1 or denitration flue L2, each bellows 101 for belonging to third section pass through respectively Wind box branch pipe 102 be connected to denitration flue L2, belong to each bellows 101 of the 4th section and pass through respective wind box branch pipe 102 and respective switching valve 13 be respectively connected to non-denitration flue L1 or denitration flue L2 in a manner of changeable, Each bellows 101 for belonging to the 5th section are connected to non-denitration flue L1 by respective wind box branch pipe 102；

Non- denitration flue L1 is after the first deduster 201, by being connected to the first desulfurization after the first exhaust fan 301 The smoke inlet of system 401, the exhanst gas outlet of the first desulphurization system 401 are connected to the first chimney 501；

After denitration flue L2 passes through the second deduster 202, cooling system is connected to by the first smoke conveying duct L3 The air inlet 601 of system 6, the air outlet 602 of cooling system 6 are connected to the cigarette of denitrating system 7 by the second smoke conveying duct L4 Gas entrance 701；

The exhanst gas outlet 702 of denitrating system 7 is connected to the smoke inlet 1101 of the first waste-heat recovery device 11, the first waste heat The exhanst gas outlet 1102 of recyclable device 11 is connected to the first desulphurization system 401 or the second desulfurization system after third deduster 203 The smoke inlet of system 402, the exhanst gas outlet of the second desulphurization system 402 are connected to the first chimney 501 or the second chimney 502.

In the present invention, the number of the bellows 101 of sintering machine 1 n=18-38, preferably n=22-34, more preferable n= 26-30.

Preferably, the number of the bellows 101 of sintering machine 1 n=28, first section includes 3 bellows, second area Section includes 2 bellows, and third section includes 16 bellows, and the 4th section includes 2 bellows, and the 5th section includes 5 Bellows.

In the present invention, the cooling system 6 is vertical cooling machine 8.

Preferably, the first smoke conveying duct L3 is equipped with the second exhaust fan 302 and the first air blower 1001.Preferably It is that the second exhaust fan 302 and the first air blower 1001 are successively set on the first smoke conveying duct after the second deduster 202 On L3.

In the present invention, the cooling system 6 is circular cooler 9.Circular cooler 9 includes high temperature section 901, middle-temperature section 902 and low-temperature zone 903.After denitration flue L2 passes through the second deduster 202, it is connected to 9 high temperature section 901 of circular cooler Air inlet.The top of high temperature section 901 is equipped with ring cold machine high temperature section fan housing 904.The air outlet of ring cold machine high temperature section fan housing 904 connects The smoke inlet 701 of denitrating system 7.

Preferably, the first smoke conveying duct L3 is equipped with third exhaust fan 303.

Preferably, seal closure 103 is equipped with above the trolley of sintering machine.Generally, seal closure 103 is arranged on sintering machine Seed region after.The air inlet of 9 low-temperature zone 903 of circular cooler is communicated with atmosphere.The top of low-temperature zone 903 is equipped with ring cold machine Low-temperature zone fan housing 906.The air inlet of 9 middle-temperature section 902 of circular cooler communicates with atmosphere and/or by ring cold machine low-temperature zone flue gas Pipeline L5 is connect with the air outlet of ring cold machine low-temperature zone fan housing 906.The top of middle-temperature section 902 is equipped with ring cold machine middle-temperature section fan housing 905.The air outlet of ring cold machine middle-temperature section fan housing 905 is connected to 1 top of sintering machine by ring cold machine middle-temperature section flue L6 Seal closure 103 is communicated with atmosphere.When sintering machine failure or other situations, the flue gas of ring cold machine middle-temperature section cannot be delivered to When sintering machine, the air outlet of ring cold machine middle-temperature section fan housing is communicated with atmosphere, guarantees the normal operation of ring cold machine.

Preferably, the second smoke conveying duct L4 is equipped with the 4th deduster 204.

Preferably, the second smoke conveying duct L4 is connected to denitrating system 7 after third waste-heat recovery device 1104 Smoke inlet 701.After sintering flue gas carries out heat exchange with sinter in a cooling system, the temperature of sintering flue gas is more than At 480 DEG C, which has been more than the best catalytic temperature of catalyst in denitrating system, this can be partially sintered to flue gas and first carried out Then UTILIZATION OF VESIDUAL HEAT IN is transported to denitrating system again.Heat can be recycled in this way and protects the catalyst in denitrating system.When After sintering flue gas carries out heat exchange with sinter in a cooling system, when the temperature of sintering flue gas is no more than 480 DEG C, by this part Sintering flue gas is delivered directly to denitrating system.

Preferably, non-denitration flue L1 is equipped with the first temperature monitor 1401 and concentration detector 15.Denitration Flue L2 is equipped with second temperature detector 1402.

Preferably, the exhanst gas outlet 1102 of the first waste-heat recovery device 11 passes through the 5th after third deduster 203 Exhaust fan 305 is connected to the smoke inlet of the first desulphurization system 401 or the second desulphurization system 402.

Preferably, the wind box branch pipe 102 connecting with each bellows 101 for belonging to the 5th section is all connected directly to third cigarette Letter shoot road L7, via being connected to non-denitration flue L1 after the 4th exhaust fan 304.

Preferably, third smoke conveying duct L7 is equipped with the second waste-heat recovery device 1103.

Preferably, the second smoke conveying duct L4 is equipped with third temperature monitor 1403.

Preferably, the first deduster 201 and third deduster 203 are electric precipitator.Second deduster 202 removes for multitube Dirt device.4th deduster 204 is hot precipitator.

Preferably, the system includes 2-5 root denitration flue L2.Every denitration flue L2 is via the second dedusting After device 202, the air inlet 601 of cooling system 6, the air outlet 602 of cooling system 6 are connected to by the first smoke conveying duct L3 Pass through the smoke inlet 701 of the second smoke conveying duct L4 connection denitrating system 7；The exhanst gas outlet 702 of denitrating system 7 is connected to The exhanst gas outlet 1102 of the smoke inlet 1101 of first waste-heat recovery device 11, the first waste-heat recovery device 11 passes through third dedusting The smoke inlet of the first desulphurization system 401 or the second desulphurization system 402, the flue gas of the second desulphurization system 402 are connected to after device 203 Outlet is connected to the first chimney 501 or the second chimney 502.

Second of the embodiment provided according to the present invention provides a kind of utilization sinter waste-heat sintered discharge gas realization The technique of denitration.

1) cloth, igniting：The mixture prepared is packed on 1 trolley of sintering machine and is lighted a fire, starts to be sintered；

2) multi-steps sintering：Sinter carries out multi-steps sintering on sintering machine 1；It is equipped with below the trolley of the sintering machine 1 multiple Bellows 101 are equipped with non-denitration flue L1 and denitration flue L2 below sintering machine 1, according to mineral aggregate operation on sintering machine 1 Direction, these bellows of sintering machine 1 are divided into 5 sections, and first section includes 2-4 bellows, and second section includes 2-3 A bellows, third section include 8-22 bellows (preferably 12-18), and the 4th section includes 2-3 bellows, the 5th area Section includes 4-6 bellows；

The flue gas for belonging to each bellows 101 of first section is delivered to non-denitration flue gas by respective wind box branch pipe 102 Pipeline L1, belong to the flue gases of each bellows 101 of second section by respective wind box branch pipe 102 and respective switching valve 13 with Changeable mode is delivered to non-denitration flue L1 or denitration flue L2 respectively, belongs to each bellows of third section 101 flue gas is delivered to denitration flue L2 by respective wind box branch pipe 102, belongs to each bellows 101 of the 4th section Flue gas non-denitration flue gas is delivered in a manner of changeable respective wind box branch pipe 102 and respective switching valve 13 respectively Pipeline L1 or denitration flue L2, the flue gas for belonging to each bellows 101 of the 5th section are defeated by respective wind box branch pipe 102 It send to non-denitration flue L1；

3) sinter is cooling：Cooling system 6 is transported to by the sintered sinter of sintering machine 1 to be cooled down；

4) non-denitration flue fume treatment：Flue gas in non-denitration flue L1 is removed by the first deduster 201 Dirt is delivered to the first desulphurization system 401 by the first exhaust fan 301 and carries out desulfurization, and flue gas after desulfurization is from the first desulphurization system 401 Exhanst gas outlet pass through the first chimney 501 discharge；

5) denitration flue fume treatment：Flue gas in denitration flue L2 after 202 dedusting of the second deduster, It is delivered to cooling system 6 by the first smoke conveying duct L3 to be cooled down, in cooling system 6, in denitration flue L2 Flue gas and cooling system 6 in sinter carry out heat exchange so that the partial fume heats up, flue gas after being heated up is (warm Degree reaches 260-480 DEG C), the flue gas after heating, which enters, carries out denitration in denitrating system 7, the flue gas after denitration is from denitrating system 7 Exhanst gas outlet 702 be discharged and be delivered in the first waste-heat recovery device 11 that carry out waste heat sharp by the second smoke conveying duct L4 With the flue gas after UTILIZATION OF VESIDUAL HEAT IN is complete is dusted optionally past third deduster 203, is then sent to the first desulphurization system 401 or second desulphurization system 402 carry out desulfurization process, flue gas after desulfurization is from from 502 row of the first chimney 501 or the second chimney It puts.

Preferably, the cooling system 6 is vertical cooling machine 8.

Preferably, the first smoke conveying duct L3 is equipped with the second exhaust fan 302 and the first air blower 1001.Preferably It is that the second exhaust fan 302 and the first air blower 1001 are successively set on the first smoke conveying duct after the second deduster 202 Upper L3.

Preferably, the cooling system 6 is circular cooler 9.Circular cooler 9 includes high temperature section 901, middle-temperature section 902 and low-temperature zone 903.Flue gas in denitration flue L2 is conveyed after 202 dedusting of the second deduster by the first flue gas Pipeline L3 is delivered to the air inlet of 9 high temperature section 901 of circular cooler.The top of high temperature section 901 is equipped with ring cold machine high temperature section fan housing 904.After high temperature section 901, flue gas is discharged from the air outlet of ring cold machine high temperature section fan housing 904 and is transported to denitrating system 7 Smoke inlet 701.

Preferably, being equipped with seal closure 103 above the trolley of sintering machine 1.Generally, seal closure 103 is arranged on sintering machine Seed region after.The top of low-temperature zone 903 is equipped with ring cold machine low-temperature zone fan housing 906.The top of middle-temperature section 902 is equipped with ring cold machine Middle-temperature section fan housing 905.Cooling wind enters low-temperature zone 903 from the air inlet of 9 low-temperature zone 903 of circular cooler.After cooling wind heat exchange It is discharged from the air outlet of ring cold machine low-temperature zone fan housing 906 and passes through ring cold machine low-temperature zone flue L5 and be delivered to circular cooler The air inlet of 9 middle-temperature sections 902.Cooling wind is discharged and leads to from the air outlet of ring cold machine middle-temperature section fan housing 905 after middle-temperature section 902 Ring cold machine middle-temperature section flue L6 is crossed to be delivered to the seal closure 103 of 1 top of sintering machine or communicate with atmosphere.When sintering machine occurs Failure or other situations, when the flue gas of ring cold machine middle-temperature section cannot be delivered to sintering machine, the air outlet of ring cold machine middle-temperature section fan housing It is communicated with atmosphere, guarantees the normal operation of ring cold machine.

Preferably seal closure is equipped with skylight 12.When ring cold machine failure or other situations, ring cold machine middle-temperature section do not have When having cooling medium discharge, the skylight above seal closure is opened, guarantees that sintering machine operates normally.

Preferably, ring cold machine low-temperature zone flue L5 is equipped with cold air inlet 16.It is optionally past from cold air inlet 16 Ring cold machine low-temperature zone flue L5 input air.

Preferably, the second smoke conveying duct L4 is equipped with the 4th deduster 204.From the exhanst gas outlet of cooling system 6 The flue gas of 602 discharges is delivered to denitrating system 7 by the second smoke conveying duct L4 again after 204 dedusting of the 4th deduster Smoke inlet 701 carries out denitration process.

Preferably, the second smoke conveying duct L4 is equipped with third waste-heat recovery device 1104.When sintering flue gas is cold But after carrying out heat exchange with sinter in system, when the temperature of sintering flue gas is more than 480 DEG C, which has been more than in denitrating system This can be partially sintered flue gas and first pass through the progress waste heat benefit of third waste-heat recovery device 1104 by the best catalytic temperature of catalyst With being then transported to the smoke inlet 701 of denitrating system 7 again.Heat can be recycled in this way and protects urging in denitrating system Agent.After sintering flue gas carries out heat exchange with sinter in a cooling system, when the temperature of sintering flue gas is no more than 480 DEG C, This is partially sintered into the smoke inlet 701 that flue gas is delivered directly to denitrating system 7.

Preferably, non-denitration flue L1 is equipped with the first temperature monitor 1401 and concentration detector 15.First Temperature monitor 1401 detects the temperature T of non-denitration flue L1 flue gas₁.Concentration detector 15 detects non-denitration flue The NO of L1 flue gas_xConcentration P.Denitration flue L2 is equipped with second temperature detector 1402.Second temperature detector 1402 is examined Survey the temperature T of flue gas in denitration flue L2₂。

Preferably, the flue gas for belonging to each bellows 101 of the 5th section passes through the wind box branch pipe connected on each bellows 101 102 are fed directly to third smoke conveying duct L7, then through third smoke conveying duct L7 after the 4th exhaust fan 304 It is transported to non-denitration flue L1.

Preferably, third smoke conveying duct L7 is equipped with the second waste-heat recovery device 1103.Each wind of 5th section The flue gas of case 101 is delivered to non-denitration smoke of gunpowder feed channel L1 after 1103 UTILIZATION OF VESIDUAL HEAT IN of the second waste-heat recovery device.

Preferably, the second smoke conveying duct L4 is equipped with third temperature monitor 1403.Third temperature monitor The temperature T of flue gas in 1403 the second smoke conveying duct L4 of detection₃。

Preferably, the technique uses 2-5 root denitration flue L2.The flue gas of every denitration flue L2 passes through the After two dedusters 202, the air inlet 601 of cooling system 6 is delivered to by the first smoke conveying duct L3, from cooling system 6 The flue gas that air outlet 602 is discharged is transported to the smoke inlet 701 of denitrating system 7 by the second smoke conveying duct L4；From de- The flue gas that the exhanst gas outlet 702 of nitre system 7 is discharged is transported to the smoke inlet 1101 of the first waste-heat recovery device 11, from first The flue gas that the exhanst gas outlet 1102 of waste-heat recovery device 11 is discharged is via being transported to the first desulfurization after 203 dedusting of third deduster The smoke inlet of system 401 or the second desulphurization system 402 goes out from the flue gas of the first desulphurization system 401 or the second desulphurization system 402 The flue gas of mouth discharge is transported to the first chimney 501 or the second chimney 502.

Preferably, being additionally provided with control system K.Control system K connects and controls switching valve 13, the first temperature monitor 1401, second temperature detector 1402, third temperature monitor 1403, concentration detector 15.

In the present invention, control system K is controlled：The temperature T of flue gas in non-denitration smoke of gunpowder feed channel L1₁It is 100-160 DEG C, Preferably 110-150 DEG C, more preferably 120-140 DEG C.

In the present invention, control system K is controlled：The NO of non-denitration flue L1 flue gas_xConcentration P is less than 200mg/m³, excellent It is selected as being less than 180mg/m³, more preferably less than 150mg/m³。

In the present invention, control system K is controlled：The temperature T of flue gas in denitration flue L2₂It is 80-150 DEG C, preferably It is 90-140 DEG C, more preferably 100-120 DEG C.

In the present invention, control system K is controlled：The temperature T of flue gas in second smoke conveying duct L4₃It is 260-480 DEG C, Preferably 300-460 DEG C, more preferably 320-450 DEG C.

Embodiment 1

The trolley lower section of sintering machine 1, the sintering machine 1 is equipped with 28 bellows 101；

Cooling system 6, and

Denitrating system 7；

Wherein, the direction according to mineral aggregate operation on sintering machine 1, these bellows of sintering machine 1 are divided into 5 sections, and first Section includes 3 bellows, and second section includes 2 bellows, and third section includes 16 bellows, and the 4th section includes 2 A bellows, the 5th section include 5 bellows；

The exhanst gas outlet 702 of denitrating system 7 is connected to the smoke inlet 1101 of the first waste-heat recovery device 11, the first waste heat The exhanst gas outlet 1102 of recyclable device 11 is connected to the smoke inlet of the second desulphurization system 402 after third deduster 203, the The exhanst gas outlet of two desulphurization systems 402 is connected to the second chimney 502.

6 vertical cooling machines 8 of cooling system.First smoke conveying duct L3 is equipped with the second exhaust fan 302 and the first drum Blower 1001.Second exhaust fan and the first air blower are successively set on the first smoke conveying duct after the second deduster.

Embodiment 2

Embodiment 1 is repeated, only the second smoke conveying duct L4 is equipped with the 4th deduster 204.Second flue gas delivery pipe Road L4 is connected to the smoke inlet 701 of denitrating system 7 after third waste-heat recovery device 1104.On non-denitration flue L1 Equipped with the first temperature monitor 1401 and concentration detector 15.Denitration flue L2 is equipped with second temperature detector 1402. The exhanst gas outlet 1102 of first waste-heat recovery device 11 is connected to the by the 5th exhaust fan 305 after third deduster 203 The smoke inlet of two desulphurization systems 402.The wind box branch pipe 102 connecting with each bellows 101 for belonging to the 5th section is all directly connected to To third smoke conveying duct L7, via being connected to non-denitration flue L1 after the 4th exhaust fan 304.Third flue gas delivery pipe Road L7 is equipped with the second waste-heat recovery device 1103.Second smoke conveying duct L4 is equipped with third temperature monitor 1403.The One deduster 201 and third deduster 203 are electric precipitator.Second deduster 202 is multi-tube dust cleaner.4th deduster 204 For hot precipitator.The system includes 2 denitration flue L2.Every denitration flue L2 is via the second deduster 202 Afterwards, the air inlet 601 of vertical cooling machine 8, the air outlet 602 of vertical cooling machine 8 are connected to by the first smoke conveying duct L3 Pass through the smoke inlet 701 of the second smoke conveying duct L4 connection denitrating system 7；The exhanst gas outlet 702 of denitrating system 7 is connected to The exhanst gas outlet 1102 of the smoke inlet 1101 of first waste-heat recovery device 11, the first waste-heat recovery device 11 passes through third dedusting The smoke inlet of the second desulphurization system 402 is connected to after device 203, the exhanst gas outlet of the second desulphurization system 402 is connected to the second cigarette Chimney 502.

Embodiment 3

Embodiment 2 is repeated, only substitutes vertical cooling machine 8 with circular cooler 9.Circular cooler 9 includes high temperature section 901, middle-temperature section 902 and low-temperature zone 903.After denitration flue L2 passes through the second deduster 202, it is connected to circular cooler 9 The air inlet of high temperature section 901.The top of high temperature section 901 is equipped with ring cold machine high temperature section fan housing 904.Ring cold machine high temperature section fan housing 904 Air outlet connection denitrating system 7 smoke inlet 701.First smoke conveying duct L3 is equipped with third exhaust fan 303.It is burning Seal closure 103 is equipped with above the trolley of knot machine.The air inlet of 9 low-temperature zone 903 of circular cooler is communicated with atmosphere.Low-temperature zone 903 Top be equipped with ring cold machine low-temperature zone fan housing 906.The air inlet of 9 middle-temperature section 902 of circular cooler communicates with atmosphere and passes through ring Cold low-temperature zone flue L5 is connect with the air outlet of ring cold machine low-temperature zone fan housing 906.It is cold that the top of middle-temperature section 902 is equipped with ring Machine middle-temperature section fan housing 905.The air outlet of ring cold machine middle-temperature section fan housing 905 is connected to burning by ring cold machine middle-temperature section flue L6 The seal closure 103 of 1 top of knot machine.

Embodiment 4

Embodiment 3 is repeated, only seal closure is equipped with skylight 12.The air outlet of ring cold machine middle-temperature section fan housing passes through ring cold machine Middle-temperature section flue is connected to the seal closure above sintering machine or communicates with atmosphere.

Use embodiment 1

Using the system of embodiment 2, a kind of technique for realizing this denitration of bottom using sinter waste-heat sintered discharge gas, The technique includes the following steps：

2) multi-steps sintering：Sinter carries out multi-steps sintering on sintering machine 1；28 are equipped with below the trolley of the sintering machine 1 Bellows 101 are equipped with non-denitration flue L1 and denitration flue L2 below sintering machine 1, according to mineral aggregate operation on sintering machine 1 Direction, these bellows of sintering machine 1 are divided into 5 sections, and first section includes 3 bellows, and second section includes 2 wind Case, third section include 16 bellows, and the 4th section includes 2 bellows, and the 5th section includes 5 bellows；

5) denitration flue fume treatment：Flue gas in denitration flue L2 after 202 dedusting of the second deduster, It is delivered to cooling system 6 by the first smoke conveying duct L3 to be cooled down, in cooling system 6, in denitration flue L2 Flue gas and cooling system 6 in sinter carry out heat exchange so that the partial fume heat up, the flue gas after being heated up, liter Flue-gas temperature after temperature is 260-480 DEG C, and the flue gas after heating, which enters, carries out denitration in denitrating system 7, the flue gas after denitration from The exhanst gas outlet 702 of denitrating system 7 is discharged and is delivered in the first waste-heat recovery device 11 by the second smoke conveying duct L4 UTILIZATION OF VESIDUAL HEAT IN is carried out, the flue gas after UTILIZATION OF VESIDUAL HEAT IN is complete is dusted by third deduster 203, is then transferred to the second desulfurization System 402 carries out desulfurization process, and the flue gas after desulfurization is discharged from from the second chimney 502.

The cooling system 6 is vertical cooling machine 8.First smoke conveying duct L3 is equipped with the second exhaust fan 302 and the One air blower 1001.Second exhaust fan and the first air blower are successively set on the first smoke conveying duct after the second deduster On.The flue gas being discharged from the exhanst gas outlet 602 of cooling system 6 is defeated by the second flue gas again after 204 dedusting of the 4th deduster It send pipeline L4 to be delivered to denitrating system 7 and carries out denitration process.Second smoke conveying duct is equipped with third waste-heat recovery device.When After sintering flue gas carries out heat exchange with sinter in a cooling system, when the temperature of sintering flue gas is more than 480 DEG C, which is more than This, can be partially sintered flue gas and first carry out UTILIZATION OF VESIDUAL HEAT IN by the best catalytic temperature of catalyst in denitrating system, then defeated again It is sent to denitrating system.Heat can be recycled in this way and protects the catalyst in denitrating system.When sintering flue gas is in cooling system In carry out heat exchange with sinter after, when the temperature of sintering flue gas is no more than 480 DEG C, this is partially sintered into flue gas and is delivered directly to Denitrating system.First temperature monitor 1401 detects the temperature T of non-denitration flue L1 flue gas₁.Concentration detector 15 detects The NO of non-denitration flue L1 flue gas_xConcentration P.Second temperature detector 1402 detects the temperature of flue gas in denitration flue L2 Spend T₂.Belong in the wind box branch pipe 102 that the flue gases of each bellows 101 of the 5th section is connected by each bellows 101 through third cigarette Letter shoot road L7 is delivered to non-denitration flue L1 after the 4th exhaust fan 304.It is set on third smoke conveying duct L7 There is the second waste-heat recovery device 1103.The flue gas of each bellows 101 of 5th section passes through 1103 waste heat of the second waste-heat recovery device Non- denitration flue L1 is delivered to after utilization.Third temperature monitor 1403 detects flue gas in the second smoke conveying duct L4 Temperature T₃.It is additionally provided with control system K.Control system K connects and controls switching valve 13, first the 1401, second temperature of temperature monitor Spend detector 1402, third temperature monitor 1403, concentration detector 15.

Control system K control：The temperature T of flue gas in non-denitration flue L1₁It is 100-160 DEG C；Non- denitration fume pipe The NO of road L1 flue gas_xConcentration P is less than 200mg/m³；The temperature T of flue gas in denitration flue L2₂It is 80-150 DEG C；Second flue gas The temperature T of flue gas in conveyance conduit L4₃It is 260-480 DEG C.

Use embodiment 2

Using the system of embodiment 3, embodiment 1 is reused, only the cooling system 6 is circular cooler 9.Ring type Cooler 9 includes high temperature section 901, middle-temperature section 902 and low-temperature zone 903.Flue gas in denitration flue L2 passes through the second dedusting After 202 dedusting of device, the air inlet of 9 high temperature section 901 of circular cooler is delivered to by the first smoke conveying duct L3.High temperature section 901 top is equipped with ring cold machine high temperature section fan housing 904.After high temperature section 901, flue gas is from ring cold machine high temperature section fan housing 904 Air outlet is discharged and is transported to the smoke inlet 701 of denitrating system 7.First smoke conveying duct L3 is equipped with third exhaust fan 303.Seal closure 103 is equipped with above the trolley of sintering machine 1.The top of low-temperature zone 903 is equipped with ring cold machine low-temperature zone fan housing 906.In The top of temperature section 902 is equipped with ring cold machine middle-temperature section fan housing 905.Cooling wind enters from the air inlet of 9 low-temperature zone 903 of circular cooler Low-temperature zone 903.It is discharged after cooling wind heat exchange from the air outlet of ring cold machine low-temperature zone fan housing 906 and passes through ring cold machine low-temperature zone flue gas Pipeline L5 is delivered to the air inlet of 9 middle-temperature section 902 of circular cooler.Cooling wind is after middle-temperature section 902 from ring cold machine middle-temperature section The air outlet of fan housing 905 is discharged and passes through the seal closure 103 that ring cold machine middle-temperature section flue L6 is delivered to 1 top of sintering machine. Ring cold machine low-temperature zone flue L5 is equipped with cold air inlet 16.It is defeated from cold air inlet 16 toward ring cold machine low-temperature zone flue L5 Enter air.

Use embodiment 3

Embodiment 2 is reused, only cooling wind is after middle-temperature section 902 from the outlet air of ring cold machine middle-temperature section fan housing 905 Mouth discharge is simultaneously delivered to the seal closure 103 of 1 top of sintering machine by ring cold machine middle-temperature section flue L6 or communicates with atmosphere.When Sintering machine breaks down or other situations, when the flue gas of ring cold machine middle-temperature section cannot be delivered to sintering machine, ring cold machine middle-temperature section wind The air outlet of cover is communicated with atmosphere, guarantees the normal operation of ring cold machine.

Seal closure is equipped with skylight 12.When ring cold machine failure or other situations, ring cold machine middle-temperature section is cooling to be situated between When matter is discharged, the skylight above seal closure is opened, guarantees that sintering machine operates normally.

Use embodiment 4

Embodiment 1 is reused, only control system K is controlled：The temperature T of flue gas in non-denitration flue L1₁For 110-150℃；The NO of non-denitration flue L1 flue gas_xConcentration P is less than 180mg/m³；The temperature of flue gas in denitration flue L2 Spend T₂It is 90-140 DEG C；The temperature T of flue gas in second smoke conveying duct L4₃It is 300-450 DEG C.

Compared with prior art cost：Denitration cost presses 6 yuan/kgNO_xMeter, the heating of prior art SCR denitration process flue gas Heat dissipation 3.81kg marks coal/t sinter.

1 denitration Cost comparisons of table

Note：In the prior art, flue gas is through 37 DEG C of heat exchanger and the total temperature drop of SCR.

The comparison of 2 operating cost of table

Note：Commercial power price presses 0.8 yuan/kWh, and grid-connected electricity price presses 0.5 yuan/kWh, and mark coal price lattice press 800 yuan/t.

Claims

1. A process for utilizing sinter waste heat to heat sinter waste gas to realize low-cost denitrification, the process comprises the following steps:

1) Fabrication and ignition: put the prepared mixture into the sintering machine (1) trolley to ignite and start sintering;

2) Segmented sintering: the sintered ore is sintered in segments on the sintering machine (1); a plurality of bellows (101) are installed under the trolley of the sintering machine (1), and a non-denitrification fume is installed under the sintering machine (1). Gas pipeline (L1) and denitrification flue gas pipeline (L2), according to the direction of mineral material running on the sintering machine (1), these bellows of the sintering machine (1) are divided into 5 sections, the first section includes 2- 4 bellows, the second section includes 2-3 bellows, the third section includes 8-22 bellows (preferably 12-18), the fourth section includes 2-3 bellows, the fifth Section includes 4-6 bellows;

The flue gas of each wind box (101) belonging to the first section is transported to the non-denitration flue gas pipeline (L1) through its respective wind box branch pipe (102), and the flue gas of each wind box (101) belonging to the second section passes through The respective bellows branch pipes (102) and the respective switching valves (13) are respectively transported to the non-denitration flue gas pipeline (L1) or the denitrification flue gas pipeline (L2) in a switchable manner, and each bellows belonging to the third section ( The flue gas of 101) is transported to the denitrification flue gas pipeline (L2) through the respective air box branch pipes (102), and the flue gas of each wind box (101) belonging to the fourth section passes through the respective air box branch pipes (102) and their respective switching The valve (13) is switchably delivered to the non-denitration flue gas pipeline (L1) or the denitrification flue gas pipeline (L2), and the flue gas of each bellows (101) belonging to the fifth section passes through the respective bellows branch pipes ( 102) transported to the non-denitration flue gas pipeline (L1);

3) Cooling of sintered ore: the sintered ore sintered by the sintering machine (1) is transported to the cooling system (6) for cooling;

4) Flue gas treatment in the non-denitration flue gas pipeline: the flue gas in the non-denitrative flue gas pipeline (L1) is dedusted by the first dust collector (201), and is transported to the first desulfurization system (401) by the first exhaust fan (301) Desulfurization is carried out, and the flue gas after desulfurization is discharged through the first chimney (501) from the flue gas outlet of the first desulfurization system (401);

5) Flue gas treatment in the denitrification flue gas pipeline: the flue gas in the denitrification flue gas pipeline (L2) is dedusted by the second dust collector (202), and then transported to the cooling system (6) through the first flue gas delivery pipeline (L3) for further processing. Cooling, in the cooling system (6), the flue gas in the denitrification flue gas pipeline (L2) exchanges heat with the sinter in the cooling system (6), so that the temperature of this part of the flue gas is increased, and the heated flue gas is obtained, and the temperature is increased The exhausted flue gas enters the denitrification system (7) for denitrification, and the denitrified flue gas is discharged from the flue gas outlet (702) of the denitrification system (7) and transported to the first waste heat through the second flue gas pipeline (L4). Waste heat is utilized in the recovery device (11), and the flue gas after the waste heat utilization is optionally passed through the third dust collector (203) for dedusting, and then sent to the first desulfurization system (401) or the second desulfurization system (402) for dedusting. For desulfurization treatment, the flue gas after desulfurization is discharged from the first chimney (501) or the second chimney (502).

2. The process according to claim 1, characterized in that: the cooling system (6) is a vertical cooling machine (8); preferably, the first flue gas delivery pipe (L3) is provided with a second draft The machine (302) and the first blower (1001), the second exhaust fan (302) and the first blower (1001) are sequentially arranged on the first flue gas delivery pipe (L3) after the second dust collector (202).

3. The process according to claim 1, characterized in that: the cooling system (6) is an annular cooler (9), and the annular cooler (9) includes a high temperature section (901), a medium temperature section (902) and the low-temperature section (903), the flue gas in the denitrification flue gas pipeline (L2) is dedusted by the second dust collector (202), and then transported to the high-temperature section of the ring cooler (9) through the first flue gas delivery pipeline (L3) (901) air inlet, the top of the high temperature section (901) is provided with the high temperature section wind cover (904) of the ring cooler, after passing through the high temperature section (901), the flue gas is discharged from the high temperature section wind cover (904) of the ring cooler The tuyere is discharged and transported to the flue gas inlet (701) of the denitrification system (7); preferably, a third exhaust fan (303) is provided on the first flue gas delivery pipe (L3).

4. The process according to claim 3, characterized in that: a sealing cover (103) is provided above the trolley of the sintering machine (1), and a wind cover (906) for the low temperature section of the ring cooler (903) is provided above the low temperature section (903). ), the top of the middle temperature section (902) is provided with the air cover (905) of the middle temperature section of the annular cooler; the cooling air enters the low temperature section (903) from the air inlet of the low temperature section (903) of the annular cooler (9), and the cooling air After heating, it is discharged from the air outlet of the low-temperature section wind hood (906) of the annular cooler and transported to the air inlet of the middle-temperature section (902) of the annular cooler (9) through the flue gas pipe (L5) of the low-temperature section of the annular cooler. After passing through the middle temperature section (902), it is discharged from the air outlet of the middle temperature section wind hood (905) of the ring cooler and transported to the sealing cover (103) above the sintering machine (1) or It communicates with the atmosphere; it is preferable that a skylight (12) is provided on the sealing cover (103); (16) Input air into the flue gas pipe (L5) of the low temperature section of the annular cooler.

5. The process according to any one of claims 1-4, characterized in that: the second flue gas delivery pipeline (L4) is provided with a fourth dust collector (204), and the flue gas from the cooling system (6) The flue gas discharged from the outlet (602) is dedusted by the fourth dust collector (204), and then transported to the flue gas inlet (701) of the denitrification system (7) through the second flue gas delivery pipeline (L4) for denitration treatment; and/or

A third waste heat recovery device (1104) is provided on the second flue gas delivery pipeline (L4), and the flue gas in the second flue gas delivery pipeline (L4) is heated by the third waste heat recovery device (1104) after heat exchange The flue gas inlet (701) delivered to the denitrification system (7).

6. The process according to any one of claims 1-5, characterized in that: the non-denitration flue gas pipeline (L1) is provided with a first temperature detector (1401) and a concentration detector (15), the first The temperature detector (1401) detects the temperature T ₁ of the flue gas in the non-denitration flue gas pipeline (L1), and the concentration detector (15) detects the _NOx concentration P of the flue gas in the non-denitration flue gas pipeline (L1); the denitrification flue gas pipeline ( L2) is provided with a second temperature detector (1402), and the _second temperature detector (1402) detects the temperature T2 of the flue gas in the denitration flue gas pipeline (L2).

7. The process according to any one of claims 1-6, characterized in that: the flue gas of each bellows (101) belonging to the fifth section passes directly through the bellows branch pipes (102) connected on each bellows (101) transported to the third flue gas delivery pipeline (L7), transported through the third flue gas delivery pipeline (L7) to the non-denitration flue gas pipeline (L1) after passing through the fourth exhaust fan (304); preferably, the third flue gas A second waste heat recovery device (1103) is installed on the flue gas conveying pipe (L7), and the flue gas from each bellows (101) in the fifth section passes through the waste heat of the second waste heat recovery device (1103) and is transported to the non-denitrative flue gas duct (L1); and/or

The second flue gas delivery pipeline (L4) is provided with a third temperature detector (1403), and the _third temperature detector (1403) detects the temperature T3 of the flue gas in the second flue gas delivery pipeline (L4).

8. The process according to any one of claims 1-7, characterized in that: the process uses 2-5 denitrification flue gas pipes (L2), and the flue gas of each denitrification flue gas pipe (L2) passes through the first After the second dust collector (202), it is transported to the air inlet (601) of the cooling system (6) through the first flue gas delivery pipe (L3), and the flue gas discharged from the air outlet (602) of the cooling system (6) passes through the second The flue gas delivery pipe (L4) is transported to the flue gas inlet (701) of the denitrification system (7); the flue gas discharged from the flue gas outlet (702) of the denitrification system (7) is transported to the first waste heat recovery device ( 11) the flue gas inlet (1101), the flue gas discharged from the flue gas outlet (1102) of the first waste heat recovery device (11) is transported to the first desulfurization system (401) after dedusting by the third dust collector (203) ) or the flue gas inlet of the second desulfurization system (402), the flue gas discharged from the flue gas outlet of the first desulfurization system (401) or the second desulfurization system (402) is transported to the first chimney (501) or the second chimney (502).

9. according to the described technology in any one of claim 1-9, it is characterized in that: also be provided with control system (K), control system (K) is connected and controls switching valve (13), the first temperature detector ( 1401), a second temperature detector (1402), a third temperature detector (1403), and a concentration detector (15).

10. The process according to claim 9, characterized in that: the control system (K) controls:

The temperature T1 _of the flue gas in the non-denitration flue gas pipeline (L1) is 100-160°C, preferably 110-150°C, more preferably 120-140°C; and/or

The NO _x concentration P of the non-denitration flue gas pipeline (L1) is less than 200 mg/m ³ , preferably less than 180 mg/m ³ , more preferably less than 150 mg/m ³ ; and/or

_The temperature T2 of the flue gas in the denitrification flue gas pipeline (L2) is 80-150°C, preferably 90-140°C, more preferably 100-120°C; and/or

The temperature T3 of the flue gas in the second flue gas delivery pipeline (L4) is _260-480 °C, preferably 300-460°C, more preferably 320-450°C.