CN209386821U - A kind of production system of pelletizing flue gas ultra-low NOx emission - Google Patents
A kind of production system of pelletizing flue gas ultra-low NOx emission Download PDFInfo
- Publication number
- CN209386821U CN209386821U CN201821581531.4U CN201821581531U CN209386821U CN 209386821 U CN209386821 U CN 209386821U CN 201821581531 U CN201821581531 U CN 201821581531U CN 209386821 U CN209386821 U CN 209386821U
- Authority
- CN
- China
- Prior art keywords
- gas
- sections
- transmission pipeline
- production system
- gas transmission
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000003546 flue gas Substances 0.000 title claims abstract description 65
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 64
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 52
- 238000005453 pelletization Methods 0.000 title claims abstract description 44
- 239000007789 gas Substances 0.000 claims abstract description 165
- 238000001035 drying Methods 0.000 claims abstract description 74
- 230000005540 biological transmission Effects 0.000 claims description 83
- 238000000034 method Methods 0.000 claims description 27
- 238000000605 extraction Methods 0.000 claims description 20
- 239000012190 activator Substances 0.000 claims description 17
- 238000005422 blasting Methods 0.000 claims description 17
- 239000002351 wastewater Substances 0.000 claims description 16
- 239000007921 spray Substances 0.000 claims description 6
- 238000011144 upstream manufacturing Methods 0.000 claims description 5
- 239000000779 smoke Substances 0.000 claims description 4
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 claims description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 83
- 239000000126 substance Substances 0.000 abstract description 5
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 238000006722 reduction reaction Methods 0.000 description 26
- 238000006243 chemical reaction Methods 0.000 description 13
- 239000008188 pellet Substances 0.000 description 7
- 239000003638 chemical reducing agent Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000006477 desulfuration reaction Methods 0.000 description 4
- 230000023556 desulfurization Effects 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000002918 waste heat Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010410 dusting Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
Landscapes
- Treating Waste Gases (AREA)
Abstract
The utility model discloses a kind of production system of pelletizing flue gas ultra-low NOx emission, the air outlet of down-draft drying zone and/or preheated one-section is connected to cold three sections of the air inlet of ring by first gas conveyance conduit by the system, the flue gas that down-draft drying zone and/or preheated one-section are discharged is by sinter processing hot on ring cold machine, the nitrogen oxides in discharge flue gas is handled using reducing substances, reduces the content of discharge nitrogen oxides in effluent.To realize the minimum discharge of pelletizing flue gas NOx, the above-mentioned technical problem faced is solved with this, there is " energy conservation, emission reduction and ultralow NOxThe characteristics of production ".
Description
Technical field
The utility model relates to the productions of the low NOx of grate-kiln pelletizing (nitrogen oxides), and in particular to a kind of pelletizing
The production system of flue gas ultra-low NOx emission belongs to engineering grate-kiln pelletizing production technical field.
Background technique
Pellet is the main iron-containing charge of China's blast furnace ironmaking, and China's pellet yield in 2015 is 128,000,000 tons.Phase
Than sinter, since low energy consumption, environment is relatively friendly for pelletizing production process, and product is with intensity is good, grade is high, metallurgical performance
Good advantage, increasing And Coke-saving can be played, improve ironmaking technology economic indicator, reduce pig iron cost, mention by being applied in blast furnace process
The effect of high economic benefit, therefore pellet is greatly developed recent years in China.
For China's pelletizing production based on grate kiln technique, yield accounts for 60% or more of pelletizing total output.In recent years
Come, with increasingly sophisticated, the raising (maturing temperature is caused to increase) of bloodstone ratio, low-rank fuel of iron ore raw material and fuel
Scale utilize, the application of the nitrogenous coke-stove gas of gas base rotary kiln etc. so that many enterprises' pelletizing production process NOx emission concentration
It is in rising trend；What Environmental Protection in China required in addition is increasingly harsh, and NOx emission is included into the checking system of discharge, from 2015,
Pelletizing production NOx is (with NO2Meter) emission limit 300mg/m3, so that this Some Enterprises needs to add denitration facility and is just able to satisfy state
The discharge standard of family.In June, 2017, State Ministry of Environmental Protection issued " steel sintering, pelletizing industrial air pollution object discharge standard "
Revision bulletin, by NOx (with NO2Meter) emission limit is from 300mg/Nm3It is adjusted downward to 100mg/Nm3, it is sintered and pellet roasting flue gas base
Quasi- oxygen content is 16%.
Although a large amount of work has been done in environmental protection by pelletizing enterprise, dedusting and desulfurization have obtained effective control, Neng Gouman
Sufficient emission request, but NOx removal is at high cost at present, complex process, under the environment of steel form depression, this gives pelletizing industry
Bring new challenge, Some Enterprises are had to a large amount of underproduction because NOx is exceeded, or even are faced and shut down.From current most of ball
From the point of view of group's condition of production, NOx generally discharges exceeded 30~100mg/m3, if can reduce NOx from source and process and produce
It is raw, so as to meet emission request, end denitration cleaning equipment can be saved, meaning is produced to grate-kiln pelletizing
It is great, be conducive to the vitality and competitiveness that further increase pelletizing enterprise.
The method of existing removing nitrogen oxides in effluent mainly selective catalytic reduction technique (SCR) and selectively non-is urged
Change reduction technique (SNCR).Wherein, temperature plays a leading role to SNCR denitration technology.It is generally acknowledged that temperature range be 800 DEG C~
1100 DEG C are more suitable for, when the temperature is excessively high, NH3Oxidation generates NO, and the concentration that may cause NO increases, and leads to the removing of NOx
Rate reduces；When the temperature is too low, NH3Reaction rate decline, NOx removal rate can also decline, while NH3Escape amount can also increase
Add.Usually the temperature range of two sections of preheating is 850 DEG C~1000 DEG C, meets the condition of SNCR denitration method, but needs to optimize control
System can be only achieved optimal emission reduction effect.
The selectivity of SCR denitration technology refers in the effect of catalyst and under oxygen existence condition, NH3Preferential and NOx
Reduction elimination reaction occurs, generates N2And H2O, and the oxygen in flue gas of getting along well carries out oxidation reaction.
In the prior art, due to there is no systematic research and the low NOx of reliable grate-kiln pelletizing production process
Generation and control technology, pelletizing plant's production process NOx emission one of ultimate challenge not up to standard faced as normality and enterprise.For
This, enterprise can only reduce coal gas or coal dust straying quatity, reduce pellet strength requirement, reduce back by reducing pellet yield
Rotary Kiln Temperature and the generation that NOx is reduced using modes such as the raw material of lower NOx and fuel.These modes are not only in yield and matter
Pellet production is affected in amount, it is also very high to the quality requirement of crude fuel, the increase of cost is caused, and cannot be fundamentally
Solve the problems, such as the low NOx production of pelletizing.In addition to this, denitrification apparatus is added after main exhauster, such as uses selective catalysis
Reduction technique (SCR) and selective non-catalytic reduction technology (SNCR), although can achieve the requirement of low NOx drainage, due to
Its cost of investment is high, equipment requirement is high, energy consumption is high, denitration is at high cost and there are secondary pollutions, is not pushed away in pelletizing enterprise
Wide application, pelletizing plant's NOx control mode mainly or by process control is realized both at home and abroad at present.
In order to meet the requirement of grate-kiln pelletizing production process NOx emission, the energy-saving and emission-reduction for responding country are called,
It the characteristics of designing more advanced air circulation, while utilize system itself, must be realized low from process flow
NOx pelletizing production.
Utility model content
For above-mentioned defect existing in the prior art and deficiency, the utility model passes through optimization grate kiln system
The process flow of system proposes a kind of production system of pelletizing flue gas ultra-low NOx emission.The system by down-draft drying zone and/or
The air outlet of preheated one-section is connected to cold three sections of the air inlet of ring by first gas conveyance conduit, by down-draft drying zone and/or
The flue gas of preheated one-section discharge handles discharge using the reducing substances in heat sinter by sinter processing hot on ring cold machine
Nitrogen oxides in flue gas reduces the content of discharge nitrogen oxides in effluent.To realize the minimum discharge of pelletizing flue gas NOx,
The above-mentioned technical problem faced is solved with this, there is " energy conservation, emission reduction and ultralow NOxThe characteristics of production ".
According to embodiment provided by the utility model, a kind of production system of pelletizing flue gas ultra-low NOx emission is provided.
A kind of production system of pelletizing flue gas ultra-low NOx emission, the production system include that drying grate, rotary kiln and ring are cold
Machine.It is moved towards according to technique, the drying grate is successively arranged two sections of blasting drying period, down-draft drying zone, preheated one-section and preheating.Ring
Cold be successively arranged ring is one section cold, ring is two sections cold, cold three sections and cold four sections of ring of ring.The preheating of the tail end connection drying grate of rotary kiln
Two sections connect cold one section of ring of ring cold machine with the other end.The air outlet of down-draft drying zone and/or preheated one-section passes through first gas
Conveyance conduit is connected to cold three sections of the air inlet of ring.
In the present invention, cold one section of the air outlet of ring is connected to rotary kiln front end via second gas conveyance conduit
Air inlet.Cold two sections of the air outlet of ring is connected to the air inlet of preheated one-section via third gas conveyance conduit.Cold three sections of ring
Air outlet is connected to the air inlet of the bottom bellows of blasting drying period via the 4th gas transmission pipeline.The air outlet of two sections of preheating
The air inlet of down-draft drying zone is connected to by the 5th gas transmission pipeline.
Preferably, the 4th gas transmission pipeline is equipped with the first SCR processing system.Reduction activator is at cold three sections of ring
It is sprayed at air outlet or the air intake vent of the first SCR processing system.
Preferably, being equipped with the first reduction activator jetting device in cold three sections of ring.The setting of reduction activator jetting device
At the bellows of the cold three sections of lower sections of ring, reduction activator sprays at cold three sections of the entrance of ring (or outlet of corresponding blower)
Enter.
Preferably, the 5th gas transmission pipeline is equipped with the 2nd SCR processing system.
Preferably, be additionally provided with the first dust-extraction unit on the 5th gas transmission pipeline, and the first dust-extraction unit is located at the
The upstream of two SCR processing systems.
Preferably, being equipped with the second reduction activator jetting device in two sections of preheating.
Preferably, the 5th gas transmission pipeline is equipped with the first residual heat using device, and residual heat using device is located at
Between first dust-extraction unit and the 2nd SCR processing system.
Preferably, cold four sections of the air outlet of ring is connect with the 8th gas transmission pipeline.
Preferably, the 8th gas transmission pipeline is equipped with the second residual heat using device, alternatively, the 8th gas transmission pipeline
It is connected to chimney.
In the present invention, the first residual heat using device and the second residual heat using device are that heat exchanger and/or waste water spray
Enter device.
Preferably, heat exchanger is pipe heat exchanger.Waste water jetting device is atomizer, and atomizer enters equipped with flue gas
Mouth, exhanst gas outlet, waterwater entrance.
Preferably, first gas conveyance conduit is equipped with the second dust-extraction unit and/or desulfurizer.
Preferably, the air outlet of down-draft drying zone or preheated one-section is by passing through the 6th gas transmission pipeline after valve
It is connected to chimney.
In the present invention, the air outlet of blasting drying period is connected to chimney by the 7th gas transmission pipeline.
Preferably, the 6th gas transmission pipeline and the 7th gas transmission pipeline are connected to chimney after merging.
In the present invention, the air outlet of down-draft drying zone and/or preheated one-section is connected by first gas conveyance conduit
It is connected to cold three sections of the air inlet of ring.The technical solution realizes that the flue gas that down-draft drying zone and/or preheated one-section are discharged passes through ring
Hot sinter processing in cold utilizes the nitrogen oxides in the reducing substances processing discharge flue gas in heat sinter, the row of reduction
The content of nitrogen oxides in effluent out.In the prior art, pass through desulfurization place from the gas that down-draft drying zone and preheated one-section are discharged
Direct emission after reason, and the content of nitrogen oxides is still higher in the portion gas, does not meet new discharge standard；The application is new
The portion gas is delivered in cold three sections of ring by type, due to still higher (the generally 300- of temperature of sinter in cold three sections of ring
400 DEG C), and contain reducing agent in sinter in itself, using the technical solution of the utility model, utilize the reduction in sinter
Agent and hot conditions, so that the gas of down-draft drying zone and/or preheated one-section discharge after the section, removes in the portion gas
Nitrogen oxides, to reduce the total emission volumn of the concentration of nitrogen oxides and nitrogen oxides in discharge gas.
In the present invention, preferably, the 4th gas transmission pipeline is equipped with the first SCR processing system.It will
The merging flue gas of down-draft drying zone and preheated one-section discharge is delivered to cold three sections of the air inlet of ring of ring cold machine, due in ring cold machine
The temperature of the cold three sections of internal oxidition pelletizings of ring reaches 300~400 DEG C, sprays into reducing agent in the bellows of the cold three sections of bottoms of ring, reduction
After agent is mixed with flue gas, using the cold three sections of internal oxidition pelletizings of ring as reaction bedding, reducing agent and the nitrogen oxides in flue gas
(NOx) SCR denitration reaction occurs, nitrogen is generated, to dispose the NO in flue gasx.In the prior art, from down-draft drying zone and
The merging flue gas of preheated one-section discharge direct emission, the utility model after desulfurization process and dust removal process change this skill
A part in this partial fume is delivered to cold three sections of ring, while spraying into reducing agent by art, utilizes the cold three sections of internal oxidition pelletizings of ring
Hot environment, realize SCR denitration, reduce the content of nitrogen oxides in effluent.At cold three sections of ring by SCR treated flue gas
It is recycled to blasting drying period, treated, and flue gas had not only been used as cold three sections of the cooling wind of ring, but also utilized the cold three sections of internal oxidition balls of ring
Nitrogen oxides in the high-temperature process flue gas of group, after blasting drying period, the content of the nitrogen oxides in effluent of discharge is lower than
50mg/Nm3Below.
In the present invention, the 5th gas transmission pipeline is equipped with the 2nd SCR processing system.Flue gas is arranged from two sections of preheating
500 DEG C of temperature < after multi-tube dusting of gas out meet the temperature condition that SCR method takes off NOx.Nitrogen oxides in flue gas is main
Generated in drying grate, the high flue gas of amount of nitrogen oxides enter preheating two sections, the utility model by from preheating two sections discharge
Gas is handled by SCR, removes the nitrogen oxides in flue gas.
In the present invention, it preheats and is equipped with the second reduction activator jetting device in two sections.In the present invention, in advance
The temperature range of two sections of heat is generally 850 DEG C~1000 DEG C, meets the temperature condition that SNCR takes off NOx method.It is pre- when drying grate
When two sections of heat is equipped with changeover portion between rotary kiln, the temperature range of changeover portion is generally 950 DEG C~1100 DEG C, can also be in mistake
Section setting reducing agent jetting device is crossed, de- NOx processing is carried out to flue gas by SNCR method.
Generally, the content of NOx is 400-700mg/m from the pelletizing flue gas that rotary kiln comes out3(such as 500mg/
m3).In the present invention, when flue gas flows through two sections of preheating of drying grate, flue gas and the reducing agent that two sections of preheating is set
The reducibility gas that jetting device inversely sprays is mixed, and the NOx in flue gas occurs with reducibility gas rapidly at high temperature
Reduction reaction generates N2, the content of the NOx in flue gas is reduced to 300mg/m3Below.Flue gas after reaction is from two sections of preheating of bottom
The air outlet of portion's bellows is discharged, and enters in SCR system after multi-tube dusting, after SCR is handled, the content of the NOx in flue gas
It is further decreased to 50mg/m3Hereinafter, and at this time in flue gas oxygen concentration < 16%, meet the requirement of minimum discharge.In this way,
The requirement of minimum discharge then may be implemented in the discharge of entire pelletizing system NOx.
It in the present invention, can when special circumstances occur and causing flue-gas temperature higher and SCR reaction condition is not achieved
It is equipped with the first residual heat using device by five gas transmission pipelines, collect or utilizes partial heat, so that flue-gas temperature is adjusted
Then section carries out SCR processing to flue gas again at 280-430 DEG C.
In the present invention, cold four sections of the air outlet of ring is connect with the 8th gas transmission pipeline, the 8th air shooter
Road is equipped with the second residual heat using device, collects the waste heat of gas in the 8th gas transmission pipeline L8.
In the present invention, the gas of down-draft drying zone or preheated one-section discharge can convey a part therein
To the cold three sections of processing of ring, another part reduces the total emission volumn of nitrogen oxides by smoke stack emission；It can also all be delivered to
Cold three sections of ring are handled.For example, by a part (such as volume ratio 10- in down-draft drying zone or preheated one-section discharge gas
90%) cold three sections of ring are delivered to, remaining gas is delivered to chimney.
The gas of down-draft drying zone or preheated one-section discharge selects to be delivered to cold three sections of ring by first gas conveyance conduit,
Or selection is delivered to chimney by the 6th gas transmission pipeline, has the valve being arranged on respective conveyance conduit control, simultaneously
The conveying capacity of the gas of down-draft drying zone and preheated one-section discharge can also be controlled each independently.
In the present invention, residual heat using device can be waste water jetting device, and the waste water that other techniques are generated sprays
Enter in the atomizer being arranged on the 5th gas transmission pipeline or the 8th gas transmission pipeline, waste water be atomized, is mixed with flue gas,
Handle waste water.Using the heat of gas transmission pipeline conveying gas, waste water is handled；Meanwhile reducing gas transmission pipeline conveying
Gas temperature makes it be more suitable SNCR or SCR denitration reaction.Residual heat using device is also possible to heat exchanger, and heat exchanger is collected
The waste heat of gas in 5th gas transmission pipeline or the 8th gas transmission pipeline is used for other purposes, such as pneumatic conveying.
In addition, the gas that is conveyed in the 8th gas transmission pipeline and the 6th gas transmission pipeline and can be closed with other gases
And since the gas temperature conveyed in the gas transmission pipeline is relatively high, after merging with the lower gas of other temperature, mention
The temperature of high entirety discharge gas, plays the role of taking off white.
The art of this patent is equally applicable to pelletizing belt type roasting machine and other Pelletizing Process with the technical characterstic.
In the present invention, the length of drying grate is usually 20-80 meters, preferably 30-70 meters, 40-60 meters more preferable.
The length of rotary kiln is usually 20-60 meters, preferably 25-50 meters, 30-45 meters more preferable, such as 35 or 40 meters.
In this application, described " upstream " or " downstream " are the concepts relative to the trend of flue gas in pipeline.
Compared with prior art, the utility model has the following beneficial effects:
1, in the utility model, the air outlet of down-draft drying zone and/or preheated one-section is connected by first gas conveyance conduit
It is connected to cold three sections of the air inlet of ring.The technical solution realizes that the flue gas that down-draft drying zone and/or preheated one-section are discharged passes through ring
Hot sinter processing in cold utilizes the nitrogen oxides in the reducing substances processing discharge flue gas in heat sinter, the row of reduction
The content of nitrogen oxides in effluent out.
2, in the utility model, it is equipped with SCR processing system on the 4th gas transmission pipeline or is set in cold three sections of ring
There is reduction activator jetting device, makes gas therein that SCR denitration reaction occur, reduce the content of nitrogen oxides in effluent.
3, in the utility model, it is equipped with residual heat using device, the heat of gas in conveyance conduit, lower gas can be collected
Temperature, make it suitable for carrying out SNCR or SCR denitration reaction；Meanwhile the heat of collection can be used for gas and convey, at waste water
It manages, take off the purposes such as white.
4, the utility model combination SCR method denitration technology, at the air outlet of two sections of preheating of drying grate of bottom bellows
SCR system is set, further reduced the concentration of emission of NOx in flue gas.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of the production system of pelletizing flue gas ultra-low NOx emission of the utility model；
Fig. 2 is that the first SCR processing system is equipped in a kind of production system of pelletizing flue gas ultra-low NOx emission of the utility model
Structural schematic diagram；
Fig. 3 is that residual heat using device is equipped in a kind of production system of pelletizing flue gas ultra-low NOx emission of the utility model
Structural schematic diagram；
Fig. 4 is down-draft drying zone and preheating one in a kind of production system of pelletizing flue gas ultra-low NOx emission of the utility model
Discharge gas in section part is delivered to the structural schematic diagram of chimney；
Fig. 5 is that flue gas is incorporated into a chimney in a kind of production system of pelletizing flue gas ultra-low NOx emission of the utility model
The structural schematic diagram of discharge.
Appended drawing reference:
1: drying grate；UDD: blasting drying period；DDD: down-draft drying zone；TPH: preheated one-section；PH: two sections of preheating；
Kiln: rotary kiln；C: ring cold machine；C1: cold one section of ring；C2: cold two sections of ring；C3: cold three sections of ring；C4: cold four sections of ring；L1: the first
Gas transmission pipeline；L2: second gas conveyance conduit；L3: third gas conveyance conduit；L4: the four gas transmission pipeline；L5:
5th gas transmission pipeline；L6: the six gas transmission pipeline；L7: the seven gas transmission pipeline；L8: the eight gas transmission pipeline；
2: the one SCR processing systems；3: the two SCR processing systems；401: the first dust-extraction units；402: the second dust-extraction units；501: the
One reduction activator jetting device；502: the second reduction activator jetting devices；6: desulfurizer；701: the first UTILIZATION OF VESIDUAL HEAT INs dress
It sets；702: the second residual heat using devices；8: chimney 9: valve.
Specific embodiment
According to embodiment provided by the utility model, a kind of production system of pelletizing flue gas ultra-low NOx emission is provided.
A kind of production system of pelletizing flue gas ultra-low NOx emission, the production system include drying grate 1, rotary kiln Kiln and
Ring cold machine C.It is moved towards according to technique, the drying grate 1 is successively arranged blasting drying period UDD, down-draft drying zone DDD, preheated one-section
Two sections of PH of TPH and preheating.Ring cold machine C is successively arranged the cold one section of C1 of ring, the cold two sections of C2 of ring, the cold three sections of C3 of ring and the cold four sections of C4 of ring.
The cold one section of C1 of ring that two sections of PH of preheating of the tail end connection drying grate 1 of rotary kiln Kiln connect ring cold machine C with the other end.Exhausting is dry
The air outlet of dry section of DDD and/or preheated one-section TPH is connected to the air inlet of the cold three sections of C3 of ring by first gas conveyance conduit L1
Mouthful.
In the present invention, the air outlet of the cold one section of C1 of ring is connected to rotary kiln via second gas conveyance conduit L2
The air inlet of the front end Kiln.The air outlet of the cold two sections of C2 of ring is connected to preheated one-section TPH's via third gas conveyance conduit L3
Air inlet.The air outlet of the cold three sections of C3 of ring is connected to the bottom bellows of blasting drying period UDD via the 4th gas transmission pipeline L4
Air inlet.The air outlet for preheating two sections of PH is connected to the air inlet of down-draft drying zone DDD by the 5th gas transmission pipeline L5.
Preferably, the 4th gas transmission pipeline L4 is equipped with the first SCR processing system 2.
Preferably, being equipped with the first reduction activator jetting device 501 in the cold three sections of C3 of ring.
Preferably, the 5th gas transmission pipeline L5 is equipped with the 2nd SCR processing system 3.
Preferably, being additionally provided with the first dust-extraction unit 401 on the 5th gas transmission pipeline L5, and the first dust-extraction unit
401 are located at the upstream of the 2nd SCR processing system 3.
Preferably, being equipped with the second reduction activator jetting device 502 in two sections of PH of preheating.
Preferably, the 5th gas transmission pipeline L5 is equipped with the first residual heat using device 701, and residual heat using device
701 between the first dust-extraction unit 401 and the 2nd SCR processing system 3.
Preferably, the air outlet of the cold four sections of C4 of ring is connect with the 8th gas transmission pipeline L8.
Preferably, the 8th gas transmission pipeline L8 is equipped with the second residual heat using device 702, alternatively, the 8th gas is defeated
Pipeline L8 is sent to be connected to chimney 8.
In the present invention, the first residual heat using device 701 and the second residual heat using device 702 be heat exchanger and/or
Waste water jetting device.
Preferably, heat exchanger is pipe heat exchanger.Waste water jetting device is atomizer, and atomizer enters equipped with flue gas
Mouth, exhanst gas outlet, waterwater entrance.
Preferably, first gas conveyance conduit L1 is equipped with the second dust-extraction unit 402 and/or desulfurizer 6.
Preferably, after the air outlet of down-draft drying zone DDD or preheated one-section TPH pass through valve 9, it is defeated by the 6th gas
Pipeline L6 is sent to be connected to chimney 8.
In the present invention, the air outlet of blasting drying period UDD is connected to chimney by the 7th gas transmission pipeline L7
8。
Preferably, the 6th gas transmission pipeline L6 and the 7th gas transmission pipeline L7 is connected to chimney 8 after merging.
Embodiment 1
As shown in Figure 1, a kind of production system of pelletizing flue gas ultra-low NOx emission, which includes drying grate 1, returns
Rotary kiln Kiln and ring cold machine C.It is moved towards according to technique, the drying grate 1 is successively arranged blasting drying period UDD, down-draft drying zone
DDD, preheated one-section TPH and two sections of PH of preheating.Ring cold machine C be successively arranged the cold one section of C1 of ring, the cold two sections of C2 of ring, the cold three sections of C3 of ring and
The cold four sections of C4 of ring.The ring cold one that two sections of PH of preheating of the tail end connection drying grate 1 of rotary kiln Kiln connect ring cold machine C with the other end
Section C1.The air outlet of down-draft drying zone DDD and/or preheated one-section TPH are connected to ring cold three by first gas conveyance conduit L1
The air inlet of section C3.
The air outlet of the cold one section of C1 of ring is connected to the air inlet of the front end rotary kiln Kiln via second gas conveyance conduit L2.
The air outlet of the cold two sections of C2 of ring is connected to the air inlet of preheated one-section TPH via third gas conveyance conduit L3.The cold three sections of C3 of ring
Air outlet be connected to via the 4th gas transmission pipeline L4 blasting drying period UDD bottom bellows air inlet.Two sections of preheating
The air outlet of PH is connected to the air inlet of down-draft drying zone DDD by the 5th gas transmission pipeline L5.
In the present invention, the flue gas of down-draft drying zone DDD and/or preheated one-section TPH discharge is by warm on ring cold machine C
Sinter processing, using in heat sinter reducing substances processing discharge flue gas in nitrogen oxides, reduce discharge flue gas in
The content of nitrogen oxides.
Embodiment 2
As shown in Fig. 2, repeating embodiment 1, only the 4th gas transmission pipeline L4 is equipped with the first SCR processing system 2.
The gas of the cold three sections of C3 discharge of ring is handled by the first SCR processing system 2 by SCR, and denitration reaction occurs, removes
Nitrogen oxides in gas.
Embodiment 3
As shown in Fig. 2, repeating embodiment 1, the first reduction activator jetting device 501 is only equipped in the cold three sections of C3 of ring.
The flue gas of down-draft drying zone DDD and/or preheated one-section TPH discharge is delivered to the cold three sections of C3 of ring, in the cold three sections of C3 of ring
It is interior, the reduction activators such as ammonia are sprayed into, denitration reaction occurs in the cold three sections of C3 of ring, remove the nitrogen oxides in gas.
Embodiment 4
As shown in figure 3, repeating embodiment 2, only the 5th gas transmission pipeline L5 is equipped with the 2nd SCR processing system 3.The
The first dust-extraction unit 401 is additionally provided on five gas transmission pipeline L5, and the first dust-extraction unit 401 is located at the 2nd SCR processing system
The upstream of system 3.
It is handled from the gas of two sections of discharges of preheating by the 2nd SCR processing system 3, denitration reaction occurs, removed in gas
Nitrogen oxides, be then delivered to down-draft drying zone DDD.
Embodiment 5
As shown in figure 3, repeating embodiment 4, only preheats and be equipped with the second reduction activator jetting device 502 in two sections of PH.
The gas given off from rotary kiln Kiln, into two sections of PH of preheating, by spraying into the reduction activators such as ammonia,
It preheats and SNCR denitration reaction treatment occurs in two sections of PH, SNCR denitration reaction efficiency is high, removes most nitrogen oxidation in flue gas
Object.
Embodiment 6
As shown in figure 4, repeating embodiment 5, only the 5th gas transmission pipeline L5 is equipped with the first residual heat using device
701, and residual heat using device 701 is between the first dust-extraction unit 401 and the 2nd SCR processing system 3.First UTILIZATION OF VESIDUAL HEAT IN
Device 701 is waste water jetting device.If the mist on the 5th gas transmission pipeline L5 is arranged in the waste water that other techniques generate
Change in device, waste water is atomized, is mixed with flue gas, handles waste water.
Embodiment 7
As shown in figure 4, repeating embodiment 5, only the air outlet of the cold four sections of C4 of ring is connect with the 8th gas transmission pipeline L8,
Eight gas transmission pipeline L8 are equipped with the second residual heat using device, and the second residual heat using device 702 is heat exchanger.
Heat exchanger collects the waste heat of gas in the 8th gas transmission pipeline L8, is used for pneumatic conveying.
Embodiment 8
As shown in figure 5, repeating embodiment 5, only the air outlet of the cold four sections of C4 of ring is connect with the 8th gas transmission pipeline L8,
8th gas transmission pipeline L8 is connected to chimney 8.
The gas temperature conveyed in 8th gas transmission pipeline L8 is relatively high, which is delivered to chimney, in chimney
The direct heat exchange of the gas of itself improves the temperature of smoke stack emission gas, plays the role of taking off white.
Embodiment 9
Embodiment 7 is repeated, only first gas conveyance conduit L1 is equipped with the second dust-extraction unit 402 and/or desulfurizer
6.It is cold that the flue gas of down-draft drying zone DDD and/or preheated one-section TPH discharge is delivered to ring again after dedusting and/or desulfurization process
Three sections of C3.
Embodiment 10
Embodiment 8 is repeated, only the air outlet of down-draft drying zone DDD or preheated one-section TPH is by after valve 9, by the
Six gas transmission pipeline L6 are connected to chimney 8.The air outlet of blasting drying period UDD is connected to by the 7th gas transmission pipeline L7
Chimney 8.
A part (such as volume ratio 70%) in down-draft drying zone DDD or preheated one-section TPH discharge gas is delivered to ring
Cold three sections of C3, remaining gas are delivered to chimney 8.
Embodiment 11
Embodiment 9 is repeated, only the 6th gas transmission pipeline L6 and the 7th gas transmission pipeline L7 is connected to after merging
Chimney 8.
The gas temperature of 6th gas transmission pipeline L6 conveying is relatively high, and the gas and the 7th gas transmission pipeline L7 are defeated
The gas sent passes through the direct heat exchange of gas in smoke stack emission, with the 7th gas transmission pipeline L7 again after merging, improve cigarette
The temperature of chimney discharge gas plays the role of taking off white.
Claims (20)
1. a kind of production system of pelletizing flue gas ultra-low NOx emission, which includes drying grate (1), rotary kiln (Kiln)
With ring cold machine (C)；It is moved towards according to technique, the drying grate (1) is successively arranged blasting drying period (UDD), down-draft drying zone
(DDD), two sections (PH) of preheated one-section (TPH) and preheating；Ring cold machine (C) be successively arranged ring cold one section (C1), ring cold two sections (C2),
Cold three sections of tetra- sections of (C3) He Huanleng (C4) of ring；The tail end connection two sections of preheating (PH) of drying grate (1) of rotary kiln (Kiln) and separately
The ring that one end connects ring cold machine (C) is cold one section (C1)；It is characterized by: down-draft drying zone (DDD) and/or preheated one-section (TPH)
Air outlet the air inlet of ring cold three sections (C3) is connected to by first gas conveyance conduit (L1).
2. production system according to claim 1, it is characterised in that: the air outlet of ring cold one section (C1) is via second gas
Conveyance conduit (L2) is connected to the air inlet of the front end rotary kiln (Kiln)；The air outlet of ring cold two sections (C2) is defeated via third gas
The air inlet for sending pipeline (L3) to be connected to preheated one-section (TPH)；The air outlet of ring cold three sections (C3) is via the 4th air shooter
Road (L4) is connected to the air inlet of the bottom bellows of blasting drying period (UDD)；The air outlet for preheating two sections (PH) passes through the 5th gas
Body conveyance conduit (L5) is connected to the air inlet of down-draft drying zone (DDD)；4th gas transmission pipeline (L4) is equipped with the first SCR
Processing system (2)；And/or
The first reduction activator jetting device (501) is equipped in ring cold three sections (C3).
3. production system according to claim 2, it is characterised in that: the 5th gas transmission pipeline (L5) is equipped with second
SCR processing system (3).
4. production system according to claim 3, it is characterised in that: be additionally provided with first on the 5th gas transmission pipeline (L5)
Dust-extraction unit (401), and the first dust-extraction unit (401) is located at the upstream of the 2nd SCR processing system (3).
5. production system described in any one of -4 according to claim 1, it is characterised in that: be equipped with second in two sections of preheating (PH)
Reduction activator jetting device (502).
6. production system according to claim 4, it is characterised in that: the 5th gas transmission pipeline (L5) is equipped with more than first
Heat utilization device (701), and residual heat using device (701) is located at the first dust-extraction unit (401) and the 2nd SCR processing system
(3) between.
7. production system described in any one of -4,6 according to claim 1, it is characterised in that: the air outlet of ring cold four sections (C4)
It is connect with the 8th gas transmission pipeline (L8).
8. production system according to claim 5, it is characterised in that: the air outlet and the 8th gas of ring cold four sections (C4) are defeated
Pipeline (L8) is sent to connect.
9. production system according to claim 7, it is characterised in that: the 8th gas transmission pipeline (L8) is equipped with more than second
Heat utilization device (702), alternatively, the 8th gas transmission pipeline (L8) is connected to chimney (8).
10. production system according to claim 8, it is characterised in that: the 8th gas transmission pipeline (L8) is equipped with second
Residual heat using device (702), alternatively, the 8th gas transmission pipeline (L8) is connected to chimney (8).
11. production system according to claim 9 or 10, it is characterised in that: the first residual heat using device (701) and second
Residual heat using device (702) is heat exchanger and/or waste water jetting device.
12. production system according to claim 11, it is characterised in that: heat exchanger is pipe heat exchanger；Waste water sprays into dress
It is set to atomizer, atomizer is equipped with smoke inlet, exhanst gas outlet, waterwater entrance.
13. according to claim 1-4,6, production system described in any one of 8-10,12, it is characterised in that: first gas is defeated
Pipeline (L1) is sent to be equipped with the second dust-extraction unit (402) and/or desulfurizer (6).
14. production system according to claim 5, it is characterised in that: first gas conveyance conduit (L1) is equipped with second
Dust-extraction unit (402) and/or desulfurizer (6).
15. production system according to claim 7, it is characterised in that: first gas conveyance conduit (L1) is equipped with second
Dust-extraction unit (402) and/or desulfurizer (6).
16. according to claim 1-4,6, production system described in any one of 8-10,12,14-15, it is characterised in that: exhausting
After the air outlet of dryer section (DDD) or preheated one-section (TPH) passes through valve (9), connected by the 6th gas transmission pipeline (L6)
To chimney (8)；And/or
The air outlet of blasting drying period (UDD) is connected to chimney (8) by the 7th gas transmission pipeline (L7).
17. production system according to claim 5, it is characterised in that: down-draft drying zone (DDD) or preheated one-section (TPH)
Air outlet by being connected to chimney (8) by the 6th gas transmission pipeline (L6) after valve (9)；And/or
The air outlet of blasting drying period (UDD) is connected to chimney (8) by the 7th gas transmission pipeline (L7).
18. production system according to claim 7, it is characterised in that: down-draft drying zone (DDD) or preheated one-section (TPH)
Air outlet by being connected to chimney (8) by the 6th gas transmission pipeline (L6) after valve (9)；And/or
The air outlet of blasting drying period (UDD) is connected to chimney (8) by the 7th gas transmission pipeline (L7).
19. according to the production system described in claim 16, it is characterised in that: the 6th gas transmission pipeline (L6) and the 7th gas are defeated
Chimney (8) are connected to after sending pipeline (L7) to merge.
20. according to production system described in claim 17 or 18, it is characterised in that: the 6th gas transmission pipeline (L6) and the 7th gas
Body conveyance conduit (L7) is connected to chimney (8) after merging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821581531.4U CN209386821U (en) | 2018-09-27 | 2018-09-27 | A kind of production system of pelletizing flue gas ultra-low NOx emission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821581531.4U CN209386821U (en) | 2018-09-27 | 2018-09-27 | A kind of production system of pelletizing flue gas ultra-low NOx emission |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209386821U true CN209386821U (en) | 2019-09-13 |
Family
ID=67869990
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821581531.4U Active CN209386821U (en) | 2018-09-27 | 2018-09-27 | A kind of production system of pelletizing flue gas ultra-low NOx emission |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209386821U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111151129A (en) * | 2020-02-21 | 2020-05-15 | 中冶大地工程咨询有限公司 | A kind of pellet flue gas denitrification treatment device and treatment method thereof |
| CN113483573A (en) * | 2021-08-04 | 2021-10-08 | 中冶北方（大连）工程技术有限公司 | Hot air recycling system of chain grate machine-circular cooler |
| CN113941243A (en) * | 2021-11-29 | 2022-01-18 | 中冶南方都市环保工程技术股份有限公司 | Pelletizing flue gas desulfurization, denitration and dust removal integrated treatment system and treatment method |
| CN114413641A (en) * | 2022-01-29 | 2022-04-29 | 中国科学院过程工程研究所 | A process and system of pellet flue gas circulation and waste heat utilization |
-
2018
- 2018-09-27 CN CN201821581531.4U patent/CN209386821U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111151129A (en) * | 2020-02-21 | 2020-05-15 | 中冶大地工程咨询有限公司 | A kind of pellet flue gas denitrification treatment device and treatment method thereof |
| CN113483573A (en) * | 2021-08-04 | 2021-10-08 | 中冶北方（大连）工程技术有限公司 | Hot air recycling system of chain grate machine-circular cooler |
| CN113941243A (en) * | 2021-11-29 | 2022-01-18 | 中冶南方都市环保工程技术股份有限公司 | Pelletizing flue gas desulfurization, denitration and dust removal integrated treatment system and treatment method |
| CN114413641A (en) * | 2022-01-29 | 2022-04-29 | 中国科学院过程工程研究所 | A process and system of pellet flue gas circulation and waste heat utilization |
| CN114413641B (en) * | 2022-01-29 | 2022-12-23 | 中国科学院过程工程研究所 | A pellet flue gas circulation and waste heat utilization process and its system |
| US12253310B2 (en) | 2022-01-29 | 2025-03-18 | Institute Of Process Engineering, Chinese Academy Of Sciences | Pellet flue gas circulation and waste heat utilization process and system thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN209197491U (en) | A kind of production system of pelletizing flue gas ultra-low NOx emission | |
| CN109373767A (en) | A production process and system for ultra-low NOx emission from pellet flue gas | |
| CN109136544B (en) | Grate-rotary kiln pellet low NOxProduction process and system thereof | |
| CN109136545B (en) | Grate-rotary kiln pellet low NOxProduction process and system thereof | |
| CN109055721B (en) | Grate-rotary kiln pellet low NOxProduction process and system | |
| CN209386821U (en) | A kind of production system of pelletizing flue gas ultra-low NOx emission | |
| CN101559323B (en) | Digestive circulating fluid bed flue gas desulfurization method and device | |
| CN209854219U (en) | Grate-rotary kiln pellet low NOx emission system | |
| CN109141028B (en) | Chain grate machine-rotary kiln pellet low NOx production device and pellet production method | |
| CN211367682U (en) | Grate-rotary kiln system | |
| CN213132673U (en) | Grate-rotary kiln pelletizing flue gas classification denitrification facility | |
| CN105080332A (en) | Resource utilization system for pellet sintering waste gas and method | |
| CN110894574A (en) | A kind of chain grate machine, chain grate machine rotary kiln oxidation pellet denitrification system and method | |
| CN110180349A (en) | A kind of grate-kiln pelletizing flue gas minimum discharge system | |
| CN207163232U (en) | The low NOx process units of grate-kiln pelletizing process | |
| CN209386820U (en) | A kind of production system of pelletizing flue gas ultra-low NOx emission | |
| CN201427021Y (en) | Flue gas desulfurization device for digestive and circulating fluidized bed | |
| CN207342475U (en) | A kind of steel sintering machine flue gas desulfurization and denitrification equipment | |
| CN108931141A (en) | A kind of technique for realizing inexpensive denitration using sinter waste-heat sintered discharge gas | |
| CN107321174B (en) | A self-catalytic denitrification process of sintering fume by coupling and utilizing the waste heat of sintering fume | |
| CN107029554B (en) | Flue gas circulation denitration system based on sintering flue gas autocatalysis | |
| CN209188501U (en) | The system of NOx in a kind of efficient removal pelletizing flue gas | |
| CN111729482A (en) | A kiln tail gas dust removal, desulfurization and denitration system | |
| CN111841271A (en) | Flue gas desulfurization and denitrification method and system by utilizing co-treatment of carbon monoxide | |
| CN209960990U (en) | Grate-rotary kiln pellet low NOx production system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |