CN105107349A - Coke oven flue gas desulfurization and denitrification purification process and device - Google Patents

Coke oven flue gas desulfurization and denitrification purification process and device Download PDF

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Publication number
CN105107349A
CN105107349A CN201510586987.4A CN201510586987A CN105107349A CN 105107349 A CN105107349 A CN 105107349A CN 201510586987 A CN201510586987 A CN 201510586987A CN 105107349 A CN105107349 A CN 105107349A
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China
Prior art keywords
flue
flue gas
ammonia
oven
dedusting
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CN201510586987.4A
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Chinese (zh)
Inventor
尹华
霍延中
王充
孙刚森
吕文彬
孙广明
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Acre Coking and Refractory Engineering Consulting Corp MCC
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Acre Coking and Refractory Engineering Consulting Corp MCC
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Priority to CN201510586987.4A priority Critical patent/CN105107349A/en
Publication of CN105107349A publication Critical patent/CN105107349A/en
Priority to PCT/CN2016/098981 priority patent/WO2017045602A1/en
Priority to KR1020177030475A priority patent/KR102003148B1/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
    • B01D46/023—Pockets filters, i.e. multiple bag filters mounted on a common frame
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
    • B01D47/06—Spray cleaning
    • B01D47/08—Spray cleaning with rotary nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/54—Nitrogen compounds
    • B01D53/56—Nitrogen oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/75—Multi-step processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—Liquid phase processes
    • B01D53/78—Liquid phase processes with gas-liquid contact
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—Liquid phase processes
    • B01D53/79—Injecting reactants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8637—Simultaneously removing sulfur oxides and nitrogen oxides

Abstract

The invention relates to a coke oven flue gas desulfurization and denitrification purification process and a device, wherein flue gas is effectively desulfurated at low temperature through a rotating spray semi-dry method before denitrating, then is denitrated by utilizing a selective catalytic reduction method and utilizing an ammonia gas which is obtained by evaporating surplus ammonia water in a coking plant steamed ammonia section as a reducing agent, a denitration process is completed in a dust removal denitration integration device, dust in flue gas is removed and particulate matter is filtered out before denitrating, and the particulate matters in flue gas which is filtered and reactants which are generated through desulfurization are conveyed into a circulating ash solution preparation unit which is arranged in a desulfurization system through a desulfurization ash collecting transportation device, and are conveyed to the top portion of a desulfurization tower through a solution transportation unit to participate in the flue gas desulfurization process after being prepared to be a circulating ash solution, thereby enabling unreacted desulfurizer to be fully utilized. The coke oven flue gas desulfurization and denitrification purification process and the device combine rotating spray drying desulfurization method and a low temperature selective catalytic reduction (SCR) denitrification, achieve efficient desulfurization and denitrification of coke oven flue gas, and are simple in technological process, small in floor space and less in equipment investment.

Description

A kind of flue gases of cock oven desulphurization denitration combined purifying technique and device
Technical field
The present invention relates to flue gases of cock oven purification techniques field, particularly relate to a kind of flue gases of cock oven desulphurization denitration combined purifying technique and device.
Background technology
In recent years, country to specify that in coking industry SO in flue gases of cock oven 2, NO xconcentration of emission index, require SO 2, NO xdischarge strictly control.Coal-fired plant flue gas amount is large, SO 2and NO xconcentration is high, serious to air environmental pollution, and desulphurization and denitration work is carried out early, and current technique is quite ripe, and desulfurization off sulfide effect is remarkable.But for flue gases of cock oven, due to himself, power plant desulfurization denitration technology the desulphurization denitration of inapplicable flue gases of cock oven, concrete reason is as follows:
(1) flue gases of cock oven temperature is lower, generally between 180 DEG C ~ 290 DEG C.
(2) for the coke-oven plant taking coke-stove gas as fuel, the SO in its flue gases of cock oven 2content is generally at 100 ~ 150mg/Nm 3, for the coke-oven plant that organic sulfur content in feed coal is higher, the SO in its flue gases of cock oven 2content can reach 350mg/Nm 3above.
(3) for newly-built coke-oven plant, can by NO by means such as exhaust gas recirculation, heat stepwise technology xcontent effectively controls at <500mg/Nm 3; But for existing enterprise or regional especially, NO cannot be met by improving coke oven heating technique xdischarge standard requirement, must take denitrification after flue gas.
(4) coke making process requires that coke oven chimney must remain hot standby state, to ensure that coke oven normal safe is produced; Flue gases of cock oven temperature after desulphurization denitration purification must higher than flue gas dew point temperature, and should not lower than 130 DEG C.
(5) coke oven practical operation situation shows, along with the growth in coke oven furnace life, furnace wall string inevitably occurs and leaks; The tar produced in carbonizing chamber can seal in the middle of coke oven flue gas, and tar is strong stickum, is potential threat, can causes permanent damage to catalyst to catalyst.
Because flue gases of cock oven temperature is lower than the serviceability temperature of power plant's conventional scr catalyst, and containing SO in flue gas 2, directly adopt power plant's conventional scr denitrating technique can generate a large amount of ammonium sulfate, blocking catalyst, and in flue gas, the sticky ingredient such as tar must stick to catalyst surface, causes possible permanent damage, normally cannot carry out denitration.Therefore directly adopt power plant's normal temperature wet desulphurization that flue gases of cock oven temperature can be caused not meet emission request.Although Low Temperature Problems can be solved by heating coke oven flue waste gas, can energy waste be caused, increase once investment and operating cost simultaneously.Therefore, desulphurization denitration process for purifying and the device of developing a kind of flue gases of cock oven are targetedly very necessary.
Summary of the invention
The invention provides a kind of flue gases of cock oven desulphurization denitration combined purifying technique and device, the desulfurization of rotary spraying and drying method is combined with low temperature SCR denitration, realize the high-efficiency desulfurization denitration to flue gases of cock oven, and technical process is simple, floor space is little, and equipment investment is few.
In order to achieve the above object, the present invention realizes by the following technical solutions:
A kind of flue gases of cock oven desulphurization denitration combined purifying technique, before denitrating flue gas, first carry out rotating spraying semidry method high efficient cryogenic fall desulfurization, the ammonia of the remained ammonia evaporation then adopting ammonia still process workshop section of coke-oven plant to produce is as reducing agent, selective catalytic reduction is utilized to carry out denitration, denitrification process carries out in dedusting denitrification integral equipment, first dust removal and filtration particle before denitration; Specifically comprise the steps:
1) flue gases of cock oven is under air-introduced machine effect, from the coke oven flue sucking-off of coke oven chimney root, delivers into desulphurization system by flue; Air-introduced machine is furnished with variable-frequency motor, by carrying out frequency control to air-introduced machine and regulating flue gases of cock oven arrival end flue gets wind electric control valve, can ensure that coke oven is normally produced required negative pressure value and desulfurization, dedusting denitrating system and normally to be worked required force value;
2) desulphurization system prepares unit by desulfurizing tower, desulfurizing agent solution, circulating ash solution prepares unit and solution supply unit forms, and prepares the standby Na of unit style by desulfurizing agent solution 2cO 3solution is delivered to the top tank at desulfurizing tower top by solution supply unit, and then desulfurizing agent solution gravity flow enters atomizer, and desulfurizing agent solution is atomized into 50 ~ 100 μm of particulates by atomizer;
3) by the smoke distributor at desulfurizing tower top, coke oven flue entraining air stream is uniformly distributed in desulfurizing tower, flue gases of cock oven fully mixes in desulfurizing tower with the desulfurizing agent particulate after atomization, SO 2with desulfurizing agent particulate generation physical-chemical reaction, generate sodium sulfite, remove the SO in flue gases of cock oven 2, powdery sodium sulfite enters dedusting denitrating system with the flue gas after coke oven flue desulfurization;
4) dedusting denitrating system is provided with dedusting denitrification integral equipment, ammonia dilution air, ammonia-flue gas blender and Desulphurization and collects conveying equipment; First flue gas enters the filter bag purification function section of dedusting denitrification integral equipment, and the dust in flue gas to be blocked on outside filter bag and to be attached to filter bag surface, and all pressures effect of resistance of the filter bag layer simultaneously makes flue gas uniform on filter course cross section;
5) flue gas after filtering mixes with the ammonia sprayed into through mixed pyrolysis regenerator section, and then enter denitrating catalyst functional section, the NOx in flue gas is reduced into N by ammonia under denitrating catalyst effect 2;
6) flue gas after dedusting denitration flows out from dedusting denitrification integral equipment top, is recycled to coke oven flue, is arranged outward by coke oven chimney through air-introduced machine, air-supply motor-driven valve;
7) reactant that the particle in the flue gas be filtered in dedusting denitrification integral equipment and desulfurization generate, the circulating ash solution be delivered in desulphurization system by Desulphurization collection conveying equipment prepares unit, be delivered to the top tank at desulfurizing tower top through solution supply unit after being mixed with circulating ash solution, participate in flue gases of cock oven sweetening process, unreacted desulfurizing agent is fully used.
In dedusting denitrating system, send in dedusting denitrification integral equipment after flue gas mixed diluting after the purification extracted with ammonia dilution air in ammonia-flue gas blender of ammonia of the remained ammonia evaporation produced from ammonia still process workshop section of coke-oven plant and carry out denitration reaction.
High temperature pyrolysis gassing body is regularly sent into the mixed pyrolysis regenerator section in dedusting denitrification integral equipment by described fuel gas hot-blast stove, impels denitrating catalyst to regenerate.
For realizing a kind of device of flue gases of cock oven desulphurization denitration combined purifying technique, comprise desulfurizing tower and dedusting denitrification integral equipment, dedusting denitrification integral equipment is provided with filter bag purification function section, mixed pyrolysis regenerator section and denitrating catalyst regenerator section from bottom to top; The flue of drawing from coke oven flue connects desulfurizing tower and dedusting denitrification integral equipment formation flue gas recirculation cleaning system successively, and the flue of dedusting denitrification integral equipment connection coke oven flue is provided with the air-introduced machine being equipped with variable-frequency motor; The atomizer at desulfurizing tower top is connected with top tank, and connect desulfurizing agent solution respectively by solution supply unit and prepare unit and circulating ash solution prepares unit, circulating ash solution is prepared unit and is collected by Desulphurization the bottom ash silo that conveying equipment connects dedusting denitrification integral equipment.
Flue between described coke oven flue and desulfurizing tower is provided with gets wind electric control valve, the flue between air-introduced machine and coke oven flue is established air-supply motor-driven valve.
The ammonia conveyance conduit of described dedusting denitrification integral equipment is provided with ammonia-flue gas blender, and its ammonia entrance connects ammonia outside line, and smoke inlet connects the flue after air-introduced machine by ammonia dilution air.
Described desulfurizing agent solution is prepared unit and is prepared unit with circulating ash solution and be connected steam, fresh water (FW) unit in addition.
Described desulfurizing tower top is provided with smoke distributor.
Filter bag in described dedusting denitrification integral equipment adopts pulse backblowing deashing, and its compressed air piping connects outside compressed air unit; Thermal desorption gas transmission pipeline in dedusting denitrification integral equipment mixed pyrolysis regenerator section connects outside fuel gas hot-blast stove.
Compared with prior art, the invention has the beneficial effects as follows:
1) first carry out desulfurization and dedusting before flue gases of cock oven denitration, remove SO 2and solve tar sticking problem; The desulfurization of rotary spraying and drying method can SO in efficient removal flue gas 2, effectively prevention generates ammonium sulfate blocking catalyst in denitration section; Desulfurization product is the dried particles thing of 50 ~ 100um, and particle enters dedusting section from desulfurizing tower, is attached to the outer surface of dedusting filtering bag, plays pre-spraying effect to filter bag, effectively can adsorb the adhesive contaminants such as the tar in flue gas, and play a protective role to catalyst;
2) in de-system, the desulfurizing agent of non-complete reaction is blocked and is attached to filter bag outer surface, with the SO in flue gas 2continue reaction, improve desulfuration efficiency further;
3) dedusting denitrification integral equipment can filter, collect Desulphurization, again sends into desulfurizing tower, realize after its secondary dosing Desulphurization and recycle, improves the utilization rate of desulfurizing agent;
4) first high-effective dust-removing before denitration, reduces dust to the wearing and tearing of denitrating catalyst, extending catalyst service life;
5) realize flue gas ash removal, denitrification integral, save and once invest, reduce operating cost, reduce floor space;
6) by all pressures effect of sock filtration layer and static pressure mixed layer, realize velocity of flue gas field, thermo parameters method more even, improve denitration efficiency further;
7) system temperature drop is low, can meet coke making process must remain hot standby state requirement to coke oven chimney.
Accompanying drawing explanation
Fig. 1 is the process chart of flue gases of cock oven desulphurization denitration combined purifying technique of the present invention.
In figure: 1a. air-introduced machine 1b. gets wind electric control valve 1c. motor-driven valve 1d. flue 2a. desulfurizing tower 2b. desulfurizing agent solution of blowing and prepares unit 2c. circulating ash solution and prepare unit 2d. solution supply unit 2e. smoke distributor 2f. and push up tank 2g. atomizer 3a. dedusting denitrification integral equipment 3b. ammonia dilution air 3c. ammonia-flue gas blender 3d. Desulphurization and collect conveying equipment 3e. fuel gas hot-blast stove 3f. filter bag purification function section 3g. mixed pyrolysis regenerator section 3h. denitrating catalyst functional section 4a. compressed air unit 4b. steam, fresh water (FW) unit 5. ammonia outside line 6. coke oven flue 7. coke oven chimney
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further:
Seeing Fig. 1, is process chart of the present invention.A kind of flue gases of cock oven desulphurization denitration combined purifying technique of the present invention, before denitrating flue gas, first carry out rotating spraying semidry method high efficient cryogenic fall desulfurization, the ammonia of the remained ammonia evaporation then adopting ammonia still process workshop section of coke-oven plant to produce is as reducing agent, selective catalytic reduction is utilized to carry out denitration, denitrification process carries out in dedusting denitrification integral equipment 3a, first dust removal and filtration particle before denitration; Specifically comprise the steps:
1) flue gases of cock oven is under air-introduced machine 1a effect, from coke oven flue 6 sucking-off of coke oven chimney 7 root, delivers into desulphurization system by flue 1d; Air-introduced machine 1a is furnished with variable-frequency motor, by carrying out frequency control to air-introduced machine 1a and regulating flue gases of cock oven arrival end flue 1d gets wind electric control valve 1b, can ensure that coke oven is normally produced required negative pressure value and desulfurization, dedusting denitrating system and normally to be worked required force value;
2) desulphurization system prepares unit 2b by desulfurizing tower 2a, desulfurizing agent solution, circulating ash solution prepares unit 2c and solution supply unit forms 2d, prepares Na prepared by unit 2b by desulfurizing agent solution 2cO 3solution is delivered to the top tank 2f at desulfurizing tower 2a top by solution supply unit 2d, and then desulfurizing agent solution gravity flow enters atomizer 2g, and desulfurizing agent solution is atomized into 50 ~ 100 μm of particulates by atomizer 2g;
3) by the smoke distributor 2e at desulfurizing tower 2a top, coke oven flue entraining air stream is uniformly distributed in desulfurizing tower 2a, flue gases of cock oven fully mixes in desulfurizing tower 2a with the desulfurizing agent particulate after atomization, SO 2with desulfurizing agent particulate generation physical-chemical reaction, generate sodium sulfite, remove the SO in flue gases of cock oven 2, powdery sodium sulfite enters dedusting denitrating system with the flue gas after coke oven flue desulfurization;
4) dedusting denitrating system is provided with dedusting denitrification integral equipment 3a, ammonia dilution air 3b, ammonia-flue gas blender 3c and Desulphurization and collects conveying equipment 3d; First flue gas enters the filter bag purification function section 3f of dedusting denitrification integral equipment 3a, and the dust in flue gas to be blocked on outside filter bag and to be attached to filter bag surface, and all pressures effect of resistance of the filter bag layer simultaneously makes flue gas uniform on filter course cross section;
5) flue gas after filtering mixes with the ammonia sprayed into through mixed pyrolysis regenerator section 3g, and then enter denitrating catalyst functional section 3h, the NOx in flue gas is reduced into N by ammonia under denitrating catalyst effect 2;
6) flue gas after dedusting denitration flows out from dedusting denitrification integral equipment 3a top, is recycled to coke oven flue 6, by the outer row of coke oven chimney 7 through air-introduced machine 1a, air-supply motor-driven valve 1c;
7) reactant that the particle in the flue gas be filtered in dedusting denitrification integral equipment 3a and desulfurization generate, the circulating ash solution be delivered in desulphurization system by Desulphurization collection conveying equipment 3d prepares unit 2c, be delivered to the top tank 2f at desulfurizing tower 2a top through solution supply unit 2d after being mixed with circulating ash solution, participate in flue gases of cock oven sweetening process, unreacted desulfurizing agent is fully used.
In dedusting denitrating system, send in dedusting denitrification integral equipment 3a after flue gas mixed diluting after the purification extracted with ammonia dilution air 3b in ammonia-flue gas blender 3c of ammonia of the remained ammonia evaporation produced from ammonia still process workshop section of coke-oven plant and carry out denitration reaction.
High temperature pyrolysis gassing body is regularly sent into the mixed pyrolysis regenerator section 3g in dedusting denitrification integral equipment 3a by described fuel gas hot-blast stove 3e, impels denitrating catalyst to regenerate.
For realizing a kind of device of flue gases of cock oven desulphurization denitration combined purifying technique, comprise desulfurizing tower 2a and dedusting denitrification integral equipment 3a, dedusting denitrification integral equipment 3a is provided with filter bag purification function section 3f, mixed pyrolysis regenerator section 3g and denitrating catalyst regenerator section 3h from bottom to top; The flue 1d drawn from coke oven flue 6 connects desulfurizing tower 2a and dedusting denitrification integral equipment 3a formation flue gas recirculation cleaning system successively, and the flue 1d that dedusting denitrification integral equipment 3a connects coke oven flue 6 is provided with the air-introduced machine 1a being equipped with variable-frequency motor; The atomizer 2g at desulfurizing tower 2a top is connected with top tank 2f, and connect desulfurizing agent solution respectively by solution supply unit 2d and prepare unit 2b and circulating ash solution prepares unit 2c, circulating ash solution is prepared unit 2c and is collected by Desulphurization the bottom ash silo that conveying equipment 3d connects dedusting denitrification integral equipment 3a.
Flue 1d between described coke oven flue 6 and desulfurizing tower 2a is provided with and gets wind electric control valve 1b, and the flue 1d between air-introduced machine 1a and coke oven flue 6 establishes the motor-driven valve 1c that blows.
The ammonia conveyance conduit of described dedusting denitrification integral equipment 3a is provided with ammonia-flue gas blender 3c, the ammonia entrance of ammonia-flue gas blender 3c connects ammonia outside line 5, and smoke inlet connects the flue 1d (along flue gas throughput direction) after air-introduced machine 1a by ammonia dilution air 3b.
Described desulfurizing agent solution is prepared unit 2b and is prepared unit 2c with circulating ash solution and be connected steam, fresh water (FW) unit 4b in addition.
Described desulfurizing tower 2a top is provided with smoke distributor 2e.
Filter bag in described dedusting denitrification integral equipment 3a adopts pulse backblowing deashing, and its compressed air piping connects outside compressed air unit 4a; Thermal desorption gas transmission pipeline in dedusting denitrification integral equipment mixed pyrolysis regenerator section 3g connects outside fuel gas hot-blast stove 3e.
A kind of flue gases of cock oven desulphurization denitration combined purifying device of the present invention is made up of induced draught system, desulphurization system, dedusting denitrating system and public auxiliary system, flue gases of cock oven circularly purifying, the flow path of flue gases of cock oven is coke oven flue 6 → desulfurizing tower 2a → dedusting denitrification integral equipment 3a → air-introduced machine 1a → coke oven flue 6 → coke oven chimney 7 → arrange outward.
Induced draught system comprises flue 1d, the air-introduced machine 1a be located on flue 1d, get wind electric control valve 1b and air-supply motor-driven valve 1c, for attracting and loopback flue gases of cock oven, for flue gases of cock oven circularly purifying provides power; Air-introduced machine 1a is arranged on the end of flue gases of cock oven circulating purification system, and desulfurizing tower 2a and dedusting denitrification integral equipment 3a is in negative pressure running status.Air-introduced machine 1a is furnished with variable-frequency motor, by carrying out frequency control to air-introduced machine 1a, regulating and get wind electric control valve 1b, can ensure that required negative pressure value normally produced by coke oven, also can ensure that desulfurization and dedusting denitrating system normally work required force value.
Desulphurization system comprises desulfurizing tower 2a, desulfurizing agent solution prepares unit 2b, circulating ash solution prepares unit 2c and solution supply unit 2d, for removing the SO in flue gases of cock oven 2; Desulfurizing tower 2a establishes at top flue gases of cock oven entrance, atomizer 2g, top tank 2f and smoke distributor 2e, and the liquid outlet of top tank 2f connects atomizer 2g, and inlet connection desulfurizing agent solution prepares unit 2b and circulating ash solution prepares unit 2c.
Desulfurizing agent solution is prepared unit 2b and is provided with desulfurizing agent warehouse, frequency conversion discharge valve, Weighing feeder, Agitation Tank, NaOH solution tank NaOH, heating water tank, in order to prepare certain density desulfurizing agent solution, for coke oven flue desulfurization.Circulating ash solution is prepared unit 2c and is provided with desulfurization ash silo, frequency conversion discharge valve, fixed discharge valve, Weighing feeder, circulating ash NaOH solution tank NaOH frequently, in order to the Desulphurization of collection is mixed with solution, and outer row again after recycling desulfurizing agent wherein.Solution supply unit 2d is provided with desulfurizing agent solution pump, circulating ash solution pump and solution delivery line, valve, in order to the qualified desulfurizing agent solution of preparation and circulating ash solution to be delivered in the top tank 2f at desulfurizing tower 2a top.
Exhanst gas outlet is established in the bottom of desulfurizing tower 2a, and taper ash bucket is established in bottom, and ash bucket outlet is provided with PS type lock gas discharge valve; Desulphurization is collected conveying equipment 3d and is comprised scrapper conveyor and bucket elevator, and the circulating ash solution that the Desulphurization in order to be discharged by dedusting denitrification integral equipment 2a is delivered to desulphurization system prepares unit 2c.
Dedusting denitrating system comprises dedusting denitrification integral equipment 3a, ammonia dilution air 3b, ammonia-flue gas blender 3c, Desulphurization collection conveying equipment 3d and fuel gas hot-blast stove 3e; Flue gas after desulfurization is first dust removal by filtration in dedusting denitrification integral equipment 3a, then mixing with the ammonia through diluting, entering catalyst layer; NO in flue gas xwith ammonia gas react under catalyst action, NO xbe reduced generation nitrogen.
Dedusting denitrification integral equipment 3a has particle purifying function, and first flue gas contacts with filter bag, stops dust to enter denitration layer, utilizes all pressures effect of resistance of the filter bag layer simultaneously, realize uniform on filter course cross section of flue gas; Unreacted desulfurizing agent is blocked and is attached to filter bag outer surface, with the SO in flue gas 2continue reaction, improve desulfuration efficiency further.Be disclose one " denitration of middle low-temperature flue gas desulfurization and dedusting and denitrating catalyst Thermal desorption integration apparatus " in the Chinese patent of 201410478420.0 (applying date is on September 18th, 2014) at application number, the version of dedusting denitrification integral equipment 3a of the present invention is substantially identical with this device, and its concrete structure does not add at this and repeats.
Public auxiliary system comprises compressed air unit 4a and steam, fresh water (FW) unit 4b, and compressed air is used for filter bag pulse dust cleaning; Steam and fresh water (FW) are in order to prepare desulfurizing agent solution and circulating ash solution; Some processes water is used for cooling and the backwash of desulphurization system.
Device of the present invention and flue are equipped with insulation material, ensure that system temperature drop is low, meet outside coke oven chimney 7 and arrange temperature requirement.

Claims (9)

1. a flue gases of cock oven desulphurization denitration combined purifying technique, it is characterized in that, before denitrating flue gas, first carry out rotating spraying semidry method high efficient cryogenic fall desulfurization, the ammonia of the remained ammonia evaporation then adopting ammonia still process workshop section of coke-oven plant to produce is as reducing agent, selective catalytic reduction is utilized to carry out denitration, denitrification process carries out in dedusting denitrification integral equipment, first dust removal and filtration particle before denitration; Specifically comprise the steps:
1) flue gases of cock oven is under air-introduced machine effect, from the coke oven flue sucking-off of coke oven chimney root, delivers into desulphurization system by flue; Air-introduced machine is furnished with variable-frequency motor, by carrying out frequency control to air-introduced machine and regulating flue gases of cock oven arrival end flue gets wind electric control valve, can ensure that coke oven is normally produced required negative pressure value and desulfurization, dedusting denitrating system and normally to be worked required force value;
2) desulphurization system prepares unit by desulfurizing tower, desulfurizing agent solution, circulating ash solution prepares unit and solution supply unit forms, and prepares the standby Na of unit style by desulfurizing agent solution 2cO 3solution is delivered to the top tank at desulfurizing tower top by solution supply unit, and then desulfurizing agent solution gravity flow enters atomizer, and desulfurizing agent solution is atomized into 50 ~ 100 μm of particulates by atomizer;
3) by the smoke distributor at desulfurizing tower top, coke oven flue entraining air stream is uniformly distributed in desulfurizing tower, flue gases of cock oven fully mixes in desulfurizing tower with the desulfurizing agent particulate after atomization, SO 2with desulfurizing agent particulate generation physical-chemical reaction, generate sodium sulfite, remove the SO in flue gases of cock oven 2, powdery sodium sulfite enters dedusting denitrating system with the flue gas after coke oven flue desulfurization;
4) dedusting denitrating system is provided with dedusting denitrification integral equipment, ammonia dilution air, ammonia-flue gas blender and Desulphurization and collects conveying equipment; First flue gas enters the filter bag purification function section of dedusting denitrification integral equipment, and the dust in flue gas to be blocked on outside filter bag and to be attached to filter bag surface, and all pressures effect of resistance of the filter bag layer simultaneously makes flue gas uniform on filter course cross section;
5) flue gas after filtering mixes with the ammonia sprayed into through mixed pyrolysis regenerator section, and then enter denitrating catalyst functional section, the NOx in flue gas is reduced into N by ammonia under denitrating catalyst effect 2;
6) flue gas after dedusting denitration flows out from dedusting denitrification integral equipment top, is recycled to coke oven flue, is arranged outward by coke oven chimney through air-introduced machine, air-supply motor-driven valve;
7) reactant that the particle in the flue gas be filtered in dedusting denitrification integral equipment and desulfurization generate, the circulating ash solution be delivered in desulphurization system by Desulphurization collection conveying equipment prepares unit, be delivered to the top tank at desulfurizing tower top through solution supply unit after being mixed with circulating ash solution, participate in flue gases of cock oven sweetening process, unreacted desulfurizing agent is fully used.
2. a kind of flue gases of cock oven desulphurization denitration combined purifying technique according to claim 1, it is characterized in that, in dedusting denitrating system, send in dedusting denitrification integral equipment after flue gas mixed diluting after the purification extracted with ammonia dilution air in ammonia-flue gas blender of ammonia of the remained ammonia evaporation produced from ammonia still process workshop section of coke-oven plant and carry out denitration reaction.
3. a kind of flue gases of cock oven desulphurization denitration combined purifying technique according to claim 1, it is characterized in that, high temperature pyrolysis gassing body is regularly sent into the mixed pyrolysis regenerator section in dedusting denitrification integral equipment by described fuel gas hot-blast stove, impels denitrating catalyst to regenerate.
4. for realizing the device of a kind of flue gases of cock oven desulphurization denitration combined purifying technique according to claim 1, it is characterized in that, comprise desulfurizing tower and dedusting denitrification integral equipment, dedusting denitrification integral equipment is provided with filter bag purification function section, mixed pyrolysis regenerator section and denitrating catalyst regenerator section from bottom to top; The flue of drawing from coke oven flue connects desulfurizing tower and dedusting denitrification integral equipment formation flue gas recirculation cleaning system successively, and the flue of dedusting denitrification integral equipment connection coke oven flue is provided with the air-introduced machine being equipped with variable-frequency motor; The atomizer at desulfurizing tower top is connected with top tank, and connect desulfurizing agent solution respectively by solution supply unit and prepare unit and circulating ash solution prepares unit, circulating ash solution is prepared unit and is collected by Desulphurization the bottom ash silo that conveying equipment connects dedusting denitrification integral equipment.
5. a kind of flue gases of cock oven desulphurization denitration combined purifying device according to claim 4, it is characterized in that, flue between described coke oven flue and desulfurizing tower is provided with gets wind electric control valve, the flue between air-introduced machine and coke oven flue is established air-supply motor-driven valve.
6. a kind of flue gases of cock oven desulphurization denitration combined purifying device according to claim 4, it is characterized in that, the ammonia conveyance conduit of described dedusting denitrification integral equipment is provided with ammonia-flue gas blender, its ammonia entrance connects ammonia outside line, and smoke inlet connects the flue after air-introduced machine by ammonia dilution air.
7. a kind of flue gases of cock oven desulphurization denitration combined purifying device according to claim 4, is characterized in that, described desulfurizing agent solution is prepared unit and prepared unit with circulating ash solution and be connected steam, fresh water (FW) unit in addition.
8. a kind of flue gases of cock oven desulphurization denitration combined purifying device according to claim 4, it is characterized in that, described desulfurizing tower top is provided with smoke distributor.
9. a kind of flue gases of cock oven desulphurization denitration combined purifying device according to claim 4, is characterized in that, the filter bag in described dedusting denitrification integral equipment adopts pulse backblowing deashing, and its compressed air piping connects outside compressed air unit; Thermal desorption gas transmission pipeline in dedusting denitrification integral equipment mixed pyrolysis regenerator section connects outside fuel gas hot-blast stove.
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