CN203853017U - Desulfurization and denitrification device for low-temperature waste gas of flue of coke oven - Google Patents
Desulfurization and denitrification device for low-temperature waste gas of flue of coke oven Download PDFInfo
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- CN203853017U CN203853017U CN201420109139.5U CN201420109139U CN203853017U CN 203853017 U CN203853017 U CN 203853017U CN 201420109139 U CN201420109139 U CN 201420109139U CN 203853017 U CN203853017 U CN 203853017U
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- ammonia
- unit
- desulfurization
- coke oven
- denitration
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- 239000000571 coke Substances 0.000 title claims abstract description 49
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 44
- 230000023556 desulfurization Effects 0.000 title claims abstract description 44
- 239000002912 waste gas Substances 0.000 title claims abstract description 28
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 242
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 107
- 239000003054 catalyst Substances 0.000 claims abstract description 91
- 239000000843 powder Substances 0.000 claims abstract description 29
- 235000011114 ammonium hydroxide Nutrition 0.000 claims abstract description 17
- 239000003546 flue gas Substances 0.000 claims description 64
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 47
- 239000002245 particle Substances 0.000 claims description 35
- 239000007789 gas Substances 0.000 claims description 31
- 238000005507 spraying Methods 0.000 claims description 29
- 238000006243 chemical reaction Methods 0.000 claims description 14
- 238000007664 blowing Methods 0.000 claims description 12
- 230000001939 inductive effect Effects 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 8
- 230000003068 static effect Effects 0.000 claims description 8
- 239000002131 composite material Substances 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 20
- 230000008569 process Effects 0.000 abstract description 14
- 239000000203 mixture Substances 0.000 abstract description 5
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000010531 catalytic reduction reaction Methods 0.000 abstract description 3
- 238000004939 coking Methods 0.000 abstract description 3
- 238000003860 storage Methods 0.000 abstract description 3
- 238000005243 fluidization Methods 0.000 abstract description 2
- 239000000779 smoke Substances 0.000 abstract description 2
- 230000006698 induction Effects 0.000 abstract 2
- 239000013618 particulate matter Substances 0.000 abstract 2
- 238000002360 preparation method Methods 0.000 abstract 2
- 150000001875 compounds Chemical class 0.000 abstract 1
- 239000000428 dust Substances 0.000 description 11
- 239000011734 sodium Substances 0.000 description 10
- 238000010438 heat treatment Methods 0.000 description 7
- 230000003009 desulfurizing effect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 239000002918 waste heat Substances 0.000 description 3
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- BIGPRXCJEDHCLP-UHFFFAOYSA-N ammonium bisulfate Chemical compound [NH4+].OS([O-])(=O)=O BIGPRXCJEDHCLP-UHFFFAOYSA-N 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 235000011130 ammonium sulphate Nutrition 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 125000001741 organic sulfur group Chemical group 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 210000001138 tear Anatomy 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
The utility model relates to a desulfurization and denitrification device for low-temperature waste gas of a flue of a coke oven. The desulfurization and denitrification device comprises an air induction unit, a desulfurization unit, an ammonia preparation unit, a denitrification and ammonia removal unit, a compressed air unit and a particulate matter conveying unit, wherein the air induction unit is composed of equipment including an induced draft fan and the like; the desulfurization unit is composed of equipment including dry powder fluidization equipment and the like; the ammonia preparation unit is composed of equipment including an ammonia water storage tank and the like; the denitrification and ammonia removal unit is composed of equipment including a denitrification catalyst layer, an ammonia removal catalyst layer and the like; the compressed air unit is composed of a compressed air storage tank and a connection pipeline; the particulate matter conveying unit is composed of equipment including a scraper plate conveyor and the like. Compared with the prior art, the desulfurization and denitrification device has the beneficial effects that residual ammonia water of a coking plant is sufficiently utilized; equipment composition is reasonably configured by a process combining dry desulfurization and denitrification of an SCR (Selective Catalytic Reduction) method; compound type desulfurization and ammonia removal equipment combining a denitrification catalyst and an ammonia removal catalyst is adopted to realize efficient desulfurization and denitrification on the low-temperature smoke of the coke oven.
Description
Technical field
The utility model relates to coke oven flue waste gas innoxious process for treating field, relates in particular to a kind of low temperature coke oven flue gas desulfurization systems denitrification apparatus.
Background technology
Coke-oven plant's coke oven flue waste gas has following characteristics:
1. stack gases temperature is lower, generally between 180 DEG C～250 DEG C.
2. for the coke-oven plant taking coke-stove gas as thermal source, the SO in its stack gases
2content is generally at 100～150mg/Nm
3between, for the higher enterprise of organic sulfur content in feed coal, the SO in its coke oven flue waste gas
2content can reach 350mg/Nm
3.
3. for newly-built coke-oven plant, can be by NO by means such as exhaust gas recirculation, heat stepwise technology
xcontent is effectively controlled at <500mg/Nm
3.For existing enterprise or regional especially, cannot meet NO by improving coke oven heating process
xdischarge standard requirement, must take denitrification after flue gas.
4. the oxygen content in coke oven flue waste gas is lower, is about 6%.Water content is the difference with the difference of coke oven heat medium, while adopting coke-stove gas heating, is about 17.25%, while adopting mixed gas heating, is about 6.6%.
The industries such as electric power, cement, glass are quite ripe to the treatment process of oxynitrides, but the coke oven flue EGT of coke-oven plant's discharge is relatively low, NO
x, SO
2content is relatively high, if adopt traditional denitrating technique, must be subject to that flue-gas temperature is low, SO
2the restriction of the factors such as content height, cannot meet coking industry NO
xdischarge standard requirement.If in order to reduce SO
2on the impact of low-temperature denitration of flue gas efficiency, and in denitrating technique preposition traditional sulfur removal technology, because flue-gas temperature decreases, can further reduce denitration efficiency.Although can solve this problem by heating coke oven flue waste gas, can cause energy waste, increase once investment and operating cost simultaneously.
At present, that coking industry does not also have is a kind of economical, desulfurizing and denitrifying process is applied in production reality reliably, therefore, develops a kind of desulfurizing and denitrifying process for coke oven flue waste gas and device is very necessary, is a good environmental protection subject yet.
Summary of the invention
The utility model overcomes provides a kind of coalitenessity kiln gas high-efficiency desulfurization denitrification apparatus, make full use of coke-oven plant's remained ammonia, the technique reasonable disposition equipment composition combining with SCR method (selective catalytic reduction) denitration according to dry desulfurization, adopt denitrating catalyst and remove the combined type denitration ammonia removal equipment that ammonia catalyst is combined, realize to coalitenessity kiln gas is carried out high-efficiency desulfurization denitration and removes ammonia.
In order to achieve the above object, the utility model is realized by the following technical solutions:
A kind of low temperature coke oven flue gas desulfurization systems denitrification apparatus, comprises that air inducing unit, desulfurization unit, ammonia are prepared unit, denitration removes ammonia unit, compressed air unit, particle supply unit; Described desulfurization unit, ammonia are prepared unit, denitration removes ammonia unit and is successively set on along on the flue gas main pipeline of airflow direction, the air-introduced machine of air inducing unit is located near denitration except near the flue outlet of ammonia unit, the chain-linked conveyer of particle supply unit is arranged on the below of denitration except ammonia unit grain thing collecting bin, and the air reservoir in compressed air unit is communicated with respectively the dry powder fluidizing apparatus of denitration except the catalyst back-blowing device of ammonia unit, airtight discharge lock gas equipment and desulfurization unit by connecting pipe.
Described air inducing unit also comprises waste gas inlet volume damper, is located on the flue of coke oven chimney bottom both sides;
Described desulfurization unit is made up of dry powder storagetank, frequency conversion dosing equipment, dry powder fluidizing apparatus; Dry powder storagetank is located at ammonia to be prepared by unit flue before, and bottom arranges frequency conversion dosing equipment and dry powder fluidizing apparatus, dry powder fluidizing apparatus other end access flue;
Described ammonia is prepared unit and is made up of tank used for storing ammonia, ammoniacal liquor weight feed pump, ammonia spraying evaporator, ammonia surge tank, ammonia-flue gas blender, ammonia-spraying grid, static mixer; Ammoniacal liquor weight feed pump is established in tank used for storing ammonia exit, and be communicated with successively ammonia spraying evaporator, ammonia surge tank, ammonia-flue gas blender by pipeline, desulphurization denitration flue after treatment is accessed by pipeline in the two ends of ammonia spraying evaporator, form loop, it is positioned at pipeline before ammonia spraying evaporator separately establishes a pipeline branch road and is communicated with successively ammonia-flue gas blender and is arranged on denitration except the ammonia-spraying grid on ammonia unit inlet duct, and static mixer is arranged on ammonia-spraying grid and is arranged in the flue in flue gas throughput direction front;
Described denitration is except ammonia unit is by denitrating catalyst layer, except ammonia catalyst layer, catalyst back-blowing device, airtight discharge are locked gas equipment, particle collecting bin forms, denitration is composite construction except ammonia unit is inner: bottom is denitrating catalyst layer, it on it, is catalyst back-blowing device, top layer is for except ammonia catalyst layer, and it is lower is particle collecting bin and airtight discharge lock gas equipment;
Described particle supply unit is made up of drag conveyor, chain bucket elevator, particle bunker, screw push-pull valve; Drag conveyor is positioned at the below of particle collecting bin, and its afterbody accesses chain bucket elevator bottom by pipeline, the top connection chain bucket elevator of particle bunker, and below discharging opening is provided with screw push-pull valve.
Described denitrating catalyst layer is filter tubular structure, and its version is similar to the filter bag in sack cleaner, and its filter cylinder is processed by catalyst, and catalyst pores is PM2.5.
Described except ammonia catalyst layer be V-shape structure, its inner stuffing is that graininess is removed ammonia catalyst.
Compared with prior art, the beneficial effects of the utility model are:
1) desulfurization and denitrification integral
Before denitration, first remove the SO in flue gas
2, can reduce SO
2outer row's concentration, prevent SO simultaneously
2under denitrating catalyst effect, change into SO
3thereby, prevent SO
3with NH
3reaction generates blocking catalyst after ammonium sulfate deliquescence, can further ensure the service life of denitration efficiency, extending catalyst.
2) new in structure, denitration efficiency is higher
Denitrating catalyst adopts filter tubular structure, the versions such as the honeycomb type that traditional catalyst adopts, template, ripple type are changed, in traditional structure, flue gas flow regime in catalyst is laminar flow shape, flue gas is that surface contact reacts with catalyst, if catalyst surface covers dust or the catalyst surface that weares and teares because kind of dust is too high, all can make the service life of catalyst and denitration efficiency reduce.And flue gas is enforceable filtration, infiltration type reaction with reacting of catalyst in filter tubular structure, hole is only PM2.5, nano level catalyst pores not only can high-efficient filter chalk dust removing and particle, simultaneously because cartridge structure itself is made up of catalyst, even so filter cylinder outer surface is worn and torn by dust, what expose remains catalyst layer, and flue gas is filtered, is infiltrated into the process of filter cylinder inner surface from filter cylinder outer surface by enforceable, can fully contact, react with catalyst, have higher denitration efficiency, service life is also more permanent.Filter tubular structure simultaneously and have certain resistance, voltage regulation result is obvious, is more conducive in equipment airflow field uniform.
3) except ammonia catalyst further improves denitration efficiency
Be provided with except ammonia catalyst structure layer on denitrating catalyst structure sheaf top, under catalyst action, NH
3preferential and NO
xetc. strong reacted, not only can effectively reduce the concentration of escape ammonia, make emission intensity concentration meet discharging standards requirement, further reduce the NO in flue gas simultaneously
xconcentration, improves denitration efficiency, and the denitration efficiency of low-temperature flue gas is reached more than 90%.
4) save the energy, reduce operating cost and once investment
Adopt desulfurization and denitrification integral process, can efficiently remove the SO in flue gases of cock oven
2, by SO in low-temperature flue gas
2content is down to minimum on the impact of denitration efficiency, denitrating catalyst structure sheaf is combined with removing ammonia catalyst structure layer simultaneously, efficiently removes the NO in flue gases of cock oven
x, do not need low temperature coke oven stack gases to take heating measure, save the energy, reduce operating cost and once investment.
5) fully recycle the remained ammonia in gas purification process
The concentration producing in employing gas purification ammonia still process workshop section is about 15%～18% remained ammonia as reducing agent, reduces pollution discharging substrate concentration outside coke-oven plant, reduces simultaneously and processes pollutant operating cost and once investment.
6) fully recycle waste heat
Ammonia evaporation and ammonia mix the coke oven flue waste gas all adopting after denitration, fully recycle the waste heat of stack gases, do not need to set up in addition to add heating agent, greatly save the energy.
7) deashing pattern is simple, convenient
Denitrating catalyst structure sheaf adopts pulse of compressed air deashing, the sodium sulphate that desulphurization system generates can be filtered at catalyst coating while passing through denitration reaction device, utilize compressed air system reverse gas cleaning, the dust stratification of blowing down and particle are sent into dust storehouse through ash-transmission system, centralized recovery is taken out, and improves system benefit.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model.
Fig. 2 is except ammonia catalyst structure sketch in the utility model.
Fig. 3 is denitrating catalyst structure diagram in the utility model.
In figure: 1. volume damper 2. desulfurization unit 2a. frequency conversion dosing equipment 2b. dry powder fluidizing apparatus 2c. dry powder storagetank 3. ammonia in air inducing unit 1a. air-introduced machine 1b. waste gas inlet are prepared unit 3a. ammoniacal liquor basin 3b. ammoniacal liquor supply pump 3c. ammonia spraying evaporator 3d. ammonia surge tank 3e. ammonia-flue gas blender 3f. ammonia-spraying grid 3g. static mixer 4. denitrations except ammonia unit 4a. denitrating catalyst layer 4b. is except the airtight discharge lock of ammonia catalyst layer 4c. catalyst back-blowing device 4d. gas equipment 4e. particle collecting bin 5. compressed air cell compression air reservoir 6. particle supply unit 6a. drag conveyor 6b. chain bucket elevator 6c. particle bunker 6d. screw push-pull valves.
Detailed description of the invention
Below in conjunction with accompanying drawing, detailed description of the invention of the present utility model is described further:
Seeing Fig. 1, is the structural representation of a kind of low temperature coke oven of the utility model flue gas desulfurization systems denitrification apparatus, comprises that air inducing unit 1, desulfurization unit 2, ammonia are prepared unit 3, denitration removes ammonia unit 4, compressed air unit 5, particle supply unit 6; This device is recycled coke-oven plant's remained ammonia to combine with coke oven flue exhuast gas desulfurization denitrating technique, first carries out dry desulfurization before denitration; The ammonia that the remained ammonia that adopts ammonia still process workshop section of coke-oven plant to produce is evaporated, as reducing agent, utilizes the denitration operation principle of selective catalytic reduction to carry out denitration; Adopt denitrating catalyst and the device that carries out denitration except ammonia catalyst integrated apparatus, can NO_x Reduction by Effective, desulfurization.
Described air inducing unit 1 is made up of air-introduced machine 1a, waste gas inlet volume damper 1b, for attracting and loopback coke oven flue waste gas; Air-introduced machine 1a is arranged near denitration and removes near the flue 4 outlets of ammonia unit, and waste gas inlet volume damper 1b is located at waste gas inlet place, coke oven chimney bottom both sides;
Described desulfurization unit 2 is made up of dry powder storagetank 2c, frequency conversion dosing equipment 2a, dry powder fluidizing apparatus 2b, for providing fluidised desulfurizing agent dry powder to coke oven flue waste gas pipeline road; Dry powder storagetank 2c is located at ammonia to be prepared by unit flue before, and bottom arranges frequency conversion dosing equipment 2a and dry powder fluidizing apparatus 2b, dry powder fluidizing apparatus 2b other end access flue.
Described ammonia is prepared unit 3 and is made up of tank used for storing ammonia 3a, ammoniacal liquor weight feed pump 3b, ammonia spraying evaporator 3c, ammonia surge tank 3d, ammonia-flue gas blender 3e, ammonia-spraying grid 3f, static mixer 3g, be used for storing ammonia solution and prepare ammonia, and ammonia is mixed with coke oven flue waste gas, send into stack gases conveyance conduit by ammonia-spraying grid 3f; Tank used for storing ammonia 3a establishes in exit ammoniacal liquor weight feed pump 3b, and be communicated with successively ammonia spraying evaporator 3c, ammonia surge tank 3d, ammonia-flue gas blender 3e by pipeline, desulphurization denitration flue after treatment is accessed by pipeline in the two ends of ammonia spraying evaporator 3c, form loop, it is positioned at pipeline before ammonia spraying evaporator 3c separately establishes a pipeline branch road and is communicated with successively ammonia-flue gas blender 3e and is arranged on denitration except the ammonia-spraying grid 3f on ammonia unit 4 inlet ducts, and static mixer 3g is arranged on ammonia-spraying grid 3f and is arranged in the flue in flue gas throughput direction front.
Described denitration forms by denitrating catalyst layer 4a, except ammonia catalyst layer 4b, catalyst back-blowing device 4c, airtight discharge lock gas equipment 4d, particle collecting bin 4e except ammonia unit 4, denitration is composite construction except ammonia unit 4 is inner: bottom is filter cylinder shape denitrating catalyst layer 4a, it on it, is catalyst back-blowing device, top layer is that V-shape removes ammonia catalyst layer 4b, and it is lower is particle collecting bin 4e and airtight discharge lock gas equipment 4d.
Described compressed air unit is made up of air reservoir 5 and connecting pipe, open and close compressed air used for delivery of equipment deashing, the fluidization of desulfurizing agent dry powder, airtight discharge lock gas equipment, and constant compression air pressure, air reservoir 5 is communicated with respectively catalyst back-blowing device 4c, dry powder fluidizing apparatus 2b and airtight discharge lock gas equipment 4d by connecting pipe;
Described particle supply unit 6 is made up of drag conveyor 6a, chain bucket elevator 6b, particle bunker 6c, screw push-pull valve 6d, for delivery of also collect particle and the dust separated from coke oven flue waste gas; Drag conveyor 6a is positioned at the below of particle collecting bin 6c, and its afterbody accesses chain bucket elevator 6b bottom by pipeline, the top connection chain bucket elevator 6b of particle bunker 6c, and below discharging opening is provided with screw push-pull valve 6d.Particle supply unit can be adjusted with process equipment deployment scenarios, and compressed Air Reverse is blown down the Na coming
2sO
3be transported to particle bunker 6c storage in powder by drag conveyor 6a and chain bucket elevator 6b, regularly outward transport.
The course of work of a kind of low temperature coke oven of the utility model flue gas desulfurization systems denitrification apparatus is as follows: coke oven flue waste gas, under air-introduced machine 1a effect, from the sucking-off of coke oven chimney root, and is carried by pipeline; Air-introduced machine 1a is furnished with variable-frequency motor, by air-introduced machine 1 is carried out to frequency control, and regulate waste gas inlet volume damper 1b, and both can ensure the needed negative pressure value of the normal production of coke oven, also can ensure the needed force value of the normal work of desulfurizing and denitrifying process system.
According to the SO in coke oven flue waste gas
2concentration, variable frequency adjustment feeding device 2a feeding coal, utilizes compressed air, by fluidizing apparatus 2b, by fluidised NaHCO
3fine powder is sent in coke oven flue waste gas pipeline road.In flue gas course of conveying, will there is following chemical reaction: 2NaHCO
3->Na
2cO
3+ H
2o+CO
2; Na
2cO
3+ SO
2->Na
2sO
3+ CO
2; 2NaHCO
3+ SO
2->Na
2sO
3+ H
2o+2CO
2.NaHCO
3fine powder decomposes the Na that generation fineness is less, specific area is larger, activity degree is higher in hot flue gas
2cO
3, improve SO
2removal efficiency.The Na that desulfurization generates
2sO
3can reclaim take-away.
Before denitration, first remove the SO in flue gas
2, can reduce SO
2outer row's concentration, prevent SO simultaneously
2under denitrating catalyst effect, change into SO
3thereby, prevent SO
3with NH
3reaction generates viscosity hydrogen sulfate ammonia blocking catalyst, can further ensure the service life of denitration efficiency, extending catalyst.
The remained ammonia that the concentration that gas purification process ammonia still process produces is 15～18% is transported in ammoniacal liquor basin 3a and is stored by pipeline, can stablize denitrating system ammoniacal liquor flow and concentration; According to the NO in coke oven flue waste gas
xcontent, variable ratio frequency changer regulates the quantity delivered of ammoniacal liquor supply pump 3b; Ammoniacal liquor weight feed pump 3b sprays into ammonia spraying evaporator 3c by the ammoniacal liquor in ammoniacal liquor basin 3a and evaporates, after evaporation, the ammonia of certain pressure is introduced into an ammonia surge tank 3d, then entering ammonia-flue gas blender 3e mixes with the exhaust after a part of denitration, mixed ammonia is evenly sprayed in the coke oven flue gas pipeline after desulfurization by the ammonia-spraying grid 3f designing after analogue simulation, and static mixer 3g can make ammonia further fully mix with flue gases of cock oven.
The coke oven flue waste gas of the thermal source of ammonia spraying evaporator 3c after from denitration, makes full use of the waste heat of flue gas, does not need to set up in addition heating system.
Ammonia-flue gas blender 3e plays dilution ammonia concentration, improves the effect of ammonia temperature, can make the ammonia spraying into better mix with flue gases of cock oven, and reduces because ammonia sprays into the flue-gas temperature decline causing.The medium mixing with ammonia adopts the stack gases through desulphurization denitration processing.
Seeing Fig. 3, is denitrating catalyst structure diagram; Denitrating catalyst layer 4a is filter tubular structure, and its version is similar to the filter bag in sack cleaner, and its filter cylinder is processed by catalyst, and catalyst pores is PM2.5.Through desulfurizing agent desulfurization and with the even mixed coke oven flue waste gas of ammonia, bottom enters denitration except ammonia unit 4 from the side, first by denitrating catalyst layer 4a.The Na generating when desulfurization
2sO
3fine powder, the NaHCO that participation is reacted
3and Na
2cO
3the dust containing in fine powder, flue gas is all filtered to the outer surface of filter cylinder shape denitrating catalyst layer 4a, flue gas is under the suction function of air-introduced machine 1a, enter filter cylinder shape denitrating catalyst layer 4a inner surface by the mandatory infiltration of layer outer surface of filter cylinder shape denitrating catalyst and through catalyst layer, in this process, low temperature coke oven stack gases fully contacts with denitrating catalyst, the NO in flue gas
xunder catalyst action, be reduced into N by ammonia
2, when flue gas is through denitrating catalyst layer outer surface dust layer simultaneously, the SO in flue gas
2meeting and NaHCO
3and Na
2cO
3fine powder continues reaction, further removes the SO in coke oven flue waste gas
2.The denitration efficiency of denitrating catalyst layer 4a changes with the variation of flue-gas temperature, and for coke-oven plant's flue-gas temperature operating mode, its denitration efficiency is about 60～80%.
Seeing Fig. 2, is except ammonia catalyst structure sketch; Except ammonia catalyst layer 4b is V-shape structure, its inner stuffing is that graininess is removed ammonia catalyst.In flue gas after denitrating catalyst layer 4a denitration, still there is certain NO
xand escape ammonia.Above-mentioned flue gas, under the vacuum suction of air-introduced machine 1a, continues across except ammonia catalyst layer 4b.Flue gas is the reaction of penetration Surface Contact with removing reacting of ammonia catalyst layer 4b.Removing under the effect of ammonia catalyst NH
3preferential and NO
xetc. strong reacted, further by NO
xbe reduced into N
2.Except ammonia catalyst layer 4b to the removal efficiency of escape ammonia up to more than 98%, simultaneously to NO
xremoval efficiency also up to more than 90%.
Flow out except 4 tops, ammonia unit or top-side from denitration except the flue gas after ammonia through denitration, and be recycled to coke oven chimney root and arrange outward.Outer coke discharging stove stack gases must ensure to have certain temperature, to ensure that coke oven chimney is all the time in hot standby state.
Along with the increase of operation hours, the equipment running resistance that denitration removes ammonia unit 4 also can progressively increase, in the time that this resistance reaches certain numerical value, catalyst back-blowing device 4c is by pulse of compressed air blowback, removing covers particle and the dust of filter cylinder outer surface, and particle and dust are blown off to particle collecting bin 4e.
Denitration has certain resistance except the denitrating catalyst layer 4a in ammonia unit 4 and except ammonia catalyst layer 4b, all presses effectively, is beneficial to device interior airflow field and temperature field uniform.
Denitration is established airtight discharge lock gas equipment 4d except ammonia unit 4 particle collecting bin 4e discharging openings, prevents because outdoor air is penetrated into and reduced smoke treatment temperature in equipment by discharging opening.
Coke oven flue waste gas pipeline road, denitration remove ammonia unit 4, ammonia spraying evaporator 3c, ammonia surge tank 3d, ammonia-flue gas blender 3e, ammonia conveyance conduit etc. and all take Insulation, prevent that temperature drop from appearring in flue gas and ammonia in course of conveying, affects denitration efficiency.
Claims (7)
1. a low temperature coke oven flue gas desulfurization systems denitrification apparatus, is characterized in that, comprises that air inducing unit, desulfurization unit, ammonia are prepared unit, denitration removes ammonia unit, compressed air unit, particle supply unit; Described desulfurization unit, ammonia are prepared unit, denitration removes ammonia unit and is successively set on along on the flue gas main pipeline of airflow direction, the air-introduced machine of air inducing unit is located near denitration except near the flue outlet of ammonia unit, the chain-linked conveyer of particle supply unit is arranged on the below of denitration except ammonia unit grain thing collecting bin, and the air reservoir in compressed air unit is communicated with respectively the dry powder fluidizing apparatus of denitration except the catalyst back-blowing device of ammonia unit, airtight discharge lock gas equipment and desulfurization unit by connecting pipe.
2. a kind of low temperature coke oven flue gas desulfurization systems denitrification apparatus according to claim 1, is characterized in that, described air inducing unit also comprises waste gas inlet volume damper, is located on the flue of coke oven chimney bottom both sides.
3. a kind of low temperature coke oven flue gas desulfurization systems denitrification apparatus according to claim 1, is characterized in that, described desulfurization unit is made up of dry powder storagetank, frequency conversion dosing equipment, dry powder fluidizing apparatus; Dry powder storagetank is located at ammonia to be prepared by unit flue before, and bottom arranges frequency conversion dosing equipment and dry powder fluidizing apparatus, dry powder fluidizing apparatus other end access flue.
4. a kind of low temperature coke oven flue gas desulfurization systems denitrification apparatus according to claim 1, it is characterized in that, described ammonia is prepared unit and is made up of tank used for storing ammonia, ammoniacal liquor weight feed pump, ammonia spraying evaporator, ammonia surge tank, ammonia-flue gas blender, ammonia-spraying grid, static mixer; Ammoniacal liquor weight feed pump is established in tank used for storing ammonia exit, and be communicated with successively ammonia spraying evaporator, ammonia surge tank, ammonia-flue gas blender by pipeline, desulphurization denitration flue after treatment is accessed by pipeline in the two ends of ammonia spraying evaporator, form loop, it is positioned at pipeline before ammonia spraying evaporator separately establishes a pipeline branch road and is communicated with successively ammonia-flue gas blender and is arranged on denitration except the ammonia-spraying grid on ammonia unit inlet duct, and static mixer is arranged on ammonia-spraying grid and is arranged in the flue in flue gas throughput direction front.
5. a kind of low temperature coke oven flue gas desulfurization systems denitrification apparatus according to claim 1, it is characterized in that, described denitration is except ammonia unit is by denitrating catalyst layer, except ammonia catalyst layer, catalyst back-blowing device, airtight discharge are locked gas equipment, particle collecting bin forms, denitration is composite construction except ammonia unit is inner: bottom is denitrating catalyst layer, it on it, is catalyst back-blowing device, top layer is for except ammonia catalyst layer, and it is lower is particle collecting bin and airtight discharge lock gas equipment.
6. a kind of low temperature coke oven flue gas desulfurization systems denitrification apparatus according to claim 1, is characterized in that, described particle supply unit is made up of drag conveyor, chain bucket elevator, particle bunker, screw push-pull valve; Drag conveyor is positioned at the below of particle collecting bin, and its afterbody accesses chain bucket elevator bottom by pipeline, the top connection chain bucket elevator of particle bunker, and below discharging opening is provided with screw push-pull valve.
7. a kind of low temperature coke oven flue gas desulfurization systems denitrification apparatus according to claim 1 or 5, is characterized in that, described except ammonia catalyst layer be V-shape structure, its inner stuffing is that graininess is removed ammonia catalyst.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420109139.5U CN203853017U (en) | 2014-03-11 | 2014-03-11 | Desulfurization and denitrification device for low-temperature waste gas of flue of coke oven |
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| CN201420109139.5U CN203853017U (en) | 2014-03-11 | 2014-03-11 | Desulfurization and denitrification device for low-temperature waste gas of flue of coke oven |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104729309A (en) * | 2015-04-15 | 2015-06-24 | 南京工业大学 | High-efficiency back-flushing decoking method for flue gas waste heat recovery system |
| CN107930367A (en) * | 2017-12-01 | 2018-04-20 | 江苏新中金环保科技股份有限公司 | A kind of coke oven flue gas denitrating technique and coke oven flue gas denitrating system |
-
2014
- 2014-03-11 CN CN201420109139.5U patent/CN203853017U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104729309A (en) * | 2015-04-15 | 2015-06-24 | 南京工业大学 | High-efficiency back-flushing decoking method for flue gas waste heat recovery system |
| CN107930367A (en) * | 2017-12-01 | 2018-04-20 | 江苏新中金环保科技股份有限公司 | A kind of coke oven flue gas denitrating technique and coke oven flue gas denitrating system |
| CN107930367B (en) * | 2017-12-01 | 2023-11-03 | 江苏新中金低碳科技股份有限公司 | Coke oven flue gas denitration process and coke oven flue gas denitration system |
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Effective date of registration: 20180829 Address after: 116085 128 high energy street, Qixian Ling high tech Industrial Park, Dalian, Liaoning Patentee after: ACRE COKING & REFRACTORY ENGINEERING CONSULTING CORPORATION (DALIAN), MCC Address before: 116085 128 high energy street, Qixian Ling high tech Industrial Park, Dalian, Liaoning Patentee before: ACRE COKING & REFRACTORY ENGINEERING CONSULTING CORPORATION, MCC |
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