CN208688275U - A kind of device reducing cement clinker burning system NOx - Google Patents
A kind of device reducing cement clinker burning system NOx Download PDFInfo
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- CN208688275U CN208688275U CN201821136449.0U CN201821136449U CN208688275U CN 208688275 U CN208688275 U CN 208688275U CN 201821136449 U CN201821136449 U CN 201821136449U CN 208688275 U CN208688275 U CN 208688275U
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Abstract
The utility model discloses a kind of devices for reducing cement clinker burning system NOx, it further include pipeline, electrically operated valve, the first agitating paddle, the second agitating paddle, safety valve, pressure gauge, the flowmeter etc. that raw material flows through based on agitator tank, weighing sensor, pipeline pump, surge tank, screw pump, spray gun, rotary kiln, dore furnace, smoke-box etc..Wherein spray gun is mounted on the top cylinder or dore furnace tapering surrounding of smoke-box；The coal dust inlet pipeline and water inlet pipeline of agitator tank are equipped with electrically operated valve, and agitator tank outside wall surface is equipped with weighing sensor, inside sets the first agitating paddle；Pipeline pump connects agitator tank and surge tank；The second agitating paddle is equipped in surge tank；The gas feed of dust-precipitator two branches in parallel, are separately connected agitator tank and surge tank.The utility model have it is adjustable it is controllable, can operate continuously, water-coal-slurry straying quatity is big, denitration efficiency is high, the ammonia volume that reduces SNCR, influences the advantages such as small to firing system.
Description
Technical field
The utility model relates to a kind of devices for reducing cement clinker burning system NOx, belong to field of environment protection.
Background technique
With the implementation of GB4915-2013 " cement industry atmosphere pollutants emission standards ", it is desirable that existing and newly-built cement
The NOx emission limit value of enterprise is by original 800mg/Nm3Drop to 400mg/Nm3(key area NOx emission limit value is 320mg/
Nm3), it is therefore desirable to mating equipment for denitrifying flue gas.Currently, most of cement production enterprises are using selective non-catalytic reduction method
(SNCR denitration technology), denitration efficiency 60%~80%, NOx emission can satisfy existing discharge standard.
In cement production enterprise, SNCR reducing agent (ammonium hydroxide) consumption in 2.3~4.6kg/t clinker, clinker denitration per ton at
2~5 yuan of this increase, enterprise increases production cost 300~8,000,000 yuan, heavy load every year.And during ammonium hydroxide transport, storage,
All there is certain potential risk, while also having a large amount of energy consumption and pollution in the production process of ammonium hydroxide, cement plant SNCR's makes
With exacerbating above-mentioned energy consumption and pollution.
The mature application in power plant of SCR denitration technology, but in cement plant, only external a small number of production lines are being run.
The denitration efficiency of SCR is high, but needs to install catalyst, and catalyst is easily poisoned, and service life is short, and operating cost is high, this
Outer SCR system takes up a large area, complex process, overhauls and safeguards and is more troublesome.Increase SCR denitration system in cement firing system
After system, system resistance increases, and need to check the ability of kiln tail high-temperature blower, also need to be transformed when fan capacity is inadequate.
Utility model content
Goal of the invention: in view of the problems of the existing technology, the purpose of the utility model is to provide a kind of reduction cement is ripe
Expect the device of firing system NOx, have it is adjustable it is controllable, can operate continuously, water-coal-slurry straying quatity is big, denitration efficiency is high, reduces
The ammonia volume of SNCR influences small advantage on firing system.
Technical solution: the utility model is achieved using following technical scheme:
A kind of device reducing cement clinker burning system NOx, including agitator tank, pipeline pump, surge tank, screw pump, peace
The pipeline that full valve, pressure gauge, flowmeter, spray gun, dust-precipitator, blower and raw material flow through；The spray gun is mounted on the top of smoke-box
Cylinder or dore furnace tapering surrounding, the upper end of the smoke-box connect dore furnace, and lower end connects rotary kiln；The coal dust of the agitator tank
Inlet pipeline is equipped with the first electrically operated valve, and water inlet pipeline is equipped with the second electrically operated valve, the tank wall of the agitator tank
Face is equipped with weighing sensor, is equipped with the first agitating paddle in tank body；One end of the pipeline pump connects agitator tank, and other end connection is slow
Rush tank；The second agitating paddle is equipped in the tank body of the surge tank；The gas feed of the dust-precipitator two branches in parallel, connect respectively
Agitator tank gas vent and surge tank gas vent are connect, the gas vent of dust-precipitator connects the blower；The water of the surge tank
Coal slurry exports the import of connecting screw pump, and the outlet of the screw pump two branches in parallel are separately connected safety valve import and pressure
One end of power table, the outlet of the safety valve connect surge tank, and the other end of the pressure gauge connects flowmeter, the flowmeter
Outlet be connected with the import of spray gun.
Preferably, the spray gun is multiple groups, it is evenly arranged on smoke-box top cylinder or dore furnace tapering surrounding.
Preferably, the material outlet connection agitator tank of the dust-precipitator or the material inlet of surge tank.
Preferably, being respectively equipped with blow valve and liquidometer on the agitator tank and surge tank.
In the specific implementation, what the coal dust inlet pipeline of the agitator tank was passed through can be single-phase coal dust powder or gas and
The fluid-mixing of coal dust.
Reaction principle: the utility model water-coal-slurry primary combustion reaction equation is as follows:
1. C (Gu)+H2O (gas) → CO (gas)+H2(gas)
2. 2C (Gu)+O2(gas) → 2CO (gas)
3. C (Gu)+CO2(gas) → 2CO (gas)
④2H2(gas)+O2(gas) → 2H2O (gas)
2CO 5. (gas)+O2(gas) → 2CO2(gas)
Water-coal-slurry denitration key reaction equation is as follows:
4CO 6. (gas)+2NO2(gas) → N2(gas)+4CO2(gas)
⑦4H2(gas)+2NO2(gas) → N2(gas)+4H2O (gas)
2CO 8. (gas)+2NO (gas) → N2(gas)+2CO2(gas)
⑨2H2(gas)+2NO (gas) → N2(gas)+2H2O (gas)
The utility model has the advantages that compared with prior art, the utility model has following advantage:
(1) most cement production enterprises are all to provide heat using coal as fuel for cement clinker burning system, therefore utilize
Existing coal milling grinding system, either single-phase coal dust powder, is also possible to the fluid of gas-particle two-phase, to produce water coal
Slurry reduces occupied area without wet processes pulping system, effectively save costs of investment such as newly-increased single rod mill or ball mills.
(2) if coal dust enters agitator tank in a manner of Dual-Phrase Distribution of Gas olid, it is in barotropic state in tank, will be stirred by blower
After mixing the gas suction in tank, dissolution of the coal dust in agitator tank is accelerated, water-coal-slurry is improved and produces rate, ensure that slurrying
The continuous-stable of system operates.
(3) system is fed using electrically operated valve, can control inlet amount, adjusts repulping rate；After the completion of slurrying, pipeline is utilized
Water-coal-slurry is pumped to surge tank storage rapidly by pump, continues slurrying convenient for agitator tank；Screw pump is adjusted using variable frequency pump, controls water
The straying quatity of coal slurry.Above-mentioned measure can effectively guarantee that system is controllable, operates continuously.
(4) in kiln tail smoke-box, the water-coal-slurry solution of penetrating carries out the evaporation of moisture first, which needs to absorb heat
Amount reduces the flame temperature of kiln tail burner to a certain extent, inhibits the generation of thermal NO x.
(5) evaporation of moisture absorbs heat in water-coal-slurry, reduces the temperature of dore furnace bottom cone and smoke-box, reduces skinning
Risk.
(6) in water-coal-slurry after moisture evaporation, volatile matter starts to be precipitated, and coke burning, part carbon and vapor occur
2. 3. 1. chemical reaction, generates the gas CO and H with electronation property2, these gases can under certain condition with flue gas
In NOx 7. 8. 9. react 6., be free of contamination N by NOx conversion2。
(7) coal dust in dore furnace is flameless combustion, and the control of no flame requires, spray gun be evenly arranged on smoke-box top cylinder or
Dore furnace tapering surrounding, influence of the water-coal-slurry to burning is smaller, and the mass flow for spraying into water-coal-slurry is big, will not influence rotary kiln
It operates normally.The water-coal-slurry of penetrating can not only reduce the NOx of rotary kiln generation, moreover it is possible to reduce the NOx of dore furnace generation, denitration effect
Rate is high.
Detailed description of the invention
Fig. 1 provides a kind of apparatus structure schematic diagram for reducing cement clinker burning system NOx for the utility model embodiment；
In figure: 1 first electrically operated valve, 2 second electrically operated valves, 3 first agitating paddles, 4 weighing sensors, 5 agitator tanks, 6
One blow valve, 7 first liquid level gauges, 8 pipeline pumps, 9 surge tanks, 10 second liquid level gauges, 11 second blow valves, 12 second agitating paddles,
13 screw pumps, 14 safety valves, 15 pressure gauges, 16 flowmeters, 17 spray guns, 18 smoke-boxes, 19 rotary kilns, 20 dore furnaces, 21 blowers, 22
Dust-precipitator.
Specific embodiment
The utility model is further elaborated now in conjunction with attached drawing 1 and specific embodiment.
As shown in Figure 1, a kind of device for reducing cement clinker burning system NOx disclosed in the utility model embodiment, with
Agitator tank 5, weighing sensor 4, pipeline pump 8, surge tank 9, screw pump 13, spray gun 17, rotary kiln 19, dore furnace 20, smoke-box 18,
Based on dust-precipitator 22, blower 21, further include raw material flow through pipeline, the first electrically operated valve 1, the second electrically operated valve 2, first stir
Mix paddle 3, first liquid level gauge 7, the first blow valve 6, the second agitating paddle 12, second liquid level gauge 10, the second blow valve 11, safety valve
14, pressure gauge 15, flowmeter 16.First electrically operated valve 1 is located on 5 coal dust inlet pipeline of agitator tank, and one end connects coal dust, another
End connection agitator tank 5, the second electrically operated valve 2 are located on the water inlet pipeline of agitator tank 5, and one end connects water, and other end connection is stirred
Mix tank 5；By electrically operated valve On-line Control and adjust the coal dust and water into agitator tank 5.The tank wall face of agitator tank 5 and title
It retransmits sensor 4 to connect, the weight of water and coal dust in agitator tank 5 is obtained by the metering of weighing sensor 4.One end of pipeline pump 8
Agitator tank 5 is connected, the other end connects surge tank 9, and agitator tank 5 is equipped with the first agitating paddle 3, the first blow valve 6, first liquid level gauge
7, surge tank 9 is equipped with the second agitating paddle 12, the second blow valve 11, second liquid level gauge 10.22 gas feed parallel connection two of dust-precipitator
A branch, is separately connected 9 gas vent of 5 gas vent of agitator tank and surge tank, 22 gas vent of dust-precipitator connect blower 21 into
Mouthful, 22 material outlet of dust-precipitator connects 9 material inlet of surge tank.Surge tank 9 exports the import of connecting screw pump 13, screw pump 13
Outlet two branches in parallel, be separately connected one end of safety valve 14 import and pressure gauge 15, the outlet connection of safety valve 14 is slow
Tank 9 is rushed, the other end of pressure gauge 15 connects flowmeter 16.The outlet of flowmeter 16 is connected with 17 import of spray gun, and spray gun 17 is installed
In the 20 tapering surrounding of top cylinder or dore furnace of smoke-box 18.The upper end of smoke-box 18 connects dore furnace 20, and lower end connects rotary kiln
19.Usually 1~4 group of spray gun 17 can be evenly distributed in 18 top cylinder of smoke-box or 20 tapering surrounding of dore furnace.Screw pump 13 uses frequency conversion
Device controls water-coal-slurry flow, 13 1~4MPa of outlet pressure of screw pump.Spray gun 17 can optionally use single fluid form or two-fluid
Atomization, inlet pressure are 0.1~2MPa.
The coal dust that the device of the present embodiment uses is the qualified products for going out mill after coal milling mill, either single-phase
Coal dust powder, be also possible to the fluid-mixing of gas and coal dust.Coal dust enters agitator tank 5 by the first electrically operated valve 1, and water passes through
Second electrically operated valve 2 enter agitator tank 5, at normal temperatures and pressures continuously in agitator tank 5 using the first agitating paddle 3 stirring 30~
The water-coal-slurry solution that meets the requirements of quality of pc concentration is made in 60min, by pipeline pump 8 by the water-coal-slurry solution in agitator tank 5
It is pumped to surge tank 9, is pressurizeed by screw pump 13, water-coal-slurry solution is delivered to spray gun 17, spray gun by 16 metered flow of flowmeter
17 are arranged in the 18 top cylinder of kiln tail smoke-box or dore furnace 20 of cement clinker burning system connection rotary kiln 19 and dore furnace 20
Tapering, water-coal-slurry solution are atomized into drop by spray gun 17 and spray into smoke-box 18 or dore furnace 20, realize denitration.
Use above-mentioned apparatus reduction cement clinker burning system NOx process are as follows: by mass concentration be 20%~
40%, the water-coal-slurry that mass flow is 1~3t/h is by being arranged in the spray of kiln tail smoke-box top cylinder or dore furnace tapering surrounding
Rifle, being atomized into diameter is that 10~60 micro droplets continuously spray into smoke-box or dore furnace, occurs one in the state of high temperature
The chemical reaction of series, generates the gas with electronation property, and NOx conversion can be under certain condition nothing by these gases
The N of pollution2。
Claims (5)
1. it is a kind of reduce cement clinker burning system NOx device, which is characterized in that including agitator tank, pipeline pump, surge tank,
The pipeline that screw pump, safety valve, pressure gauge, flowmeter, spray gun, dust-precipitator, blower and raw material flow through；The spray gun is mounted on cigarette
The top cylinder or dore furnace tapering surrounding of room, the upper end of the smoke-box connect dore furnace, and lower end connects rotary kiln；The stirring
The coal dust inlet pipeline of tank is equipped with the first electrically operated valve, and water inlet pipeline is equipped with the second electrically operated valve, the agitator tank
Tank wall face is equipped with weighing sensor, is equipped with the first agitating paddle in tank body；One end of the pipeline pump connects agitator tank, another
End connection surge tank；The second agitating paddle is equipped in the tank body of the surge tank；The gas feed of the dust-precipitator two branch in parallel
Road, is separately connected agitator tank gas vent and surge tank gas vent, and the gas vent of dust-precipitator connects the blower；It is described slow
The import of the water-coal-slurry outlet connecting screw pump of tank is rushed, the outlet of the screw pump two branches in parallel are separately connected safety valve
One end of import and pressure gauge, the outlet of the safety valve connect surge tank, and the other end of the pressure gauge connects flowmeter, institute
The outlet for stating flowmeter is connected with the import of spray gun.
2. a kind of device for reducing cement clinker burning system NOx according to claim 1, which is characterized in that the spray
Rifle is multiple groups, is evenly arranged on smoke-box top cylinder or dore furnace tapering surrounding.
3. a kind of device for reducing cement clinker burning system NOx according to claim 1, which is characterized in that the receipts
The material outlet connection agitator tank of dirt device or the material inlet of surge tank.
4. a kind of device for reducing cement clinker burning system NOx according to claim 1, which is characterized in that described to stir
It mixes and is respectively equipped with blow valve and liquidometer on tank and surge tank.
5. a kind of device for reducing cement clinker burning system NOx according to claim 1, which is characterized in that described to stir
Mix that the coal dust inlet pipeline of tank is passed through is the fluid-mixing of single-phase coal dust powder or gas and coal dust.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821136449.0U CN208688275U (en) | 2018-07-17 | 2018-07-17 | A kind of device reducing cement clinker burning system NOx |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821136449.0U CN208688275U (en) | 2018-07-17 | 2018-07-17 | A kind of device reducing cement clinker burning system NOx |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108731491A (en) * | 2018-07-17 | 2018-11-02 | 中国中材国际工程股份有限公司 | A kind of reduction cement clinker burning system NOxDevice and process |
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- 2018-07-17 CN CN201821136449.0U patent/CN208688275U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108731491A (en) * | 2018-07-17 | 2018-11-02 | 中国中材国际工程股份有限公司 | A kind of reduction cement clinker burning system NOxDevice and process |
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