CN106178864A - A kind of flue gases of cock oven low-temperature denitration desulfurizer and technique - Google Patents
A kind of flue gases of cock oven low-temperature denitration desulfurizer and technique Download PDFInfo
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- CN106178864A CN106178864A CN201610786898.9A CN201610786898A CN106178864A CN 106178864 A CN106178864 A CN 106178864A CN 201610786898 A CN201610786898 A CN 201610786898A CN 106178864 A CN106178864 A CN 106178864A
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- 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
- B01D53/60—Simultaneously removing sulfur oxides and nitrogen oxides
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- 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
- B01D53/76—Gas phase processes, e.g. by using aerosols
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- 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
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- 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
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8628—Processes characterised by a specific catalyst
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- 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
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2067—Urea
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2256/00—Main component in the product gas stream after treatment
- B01D2256/10—Nitrogen
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Abstract
A kind of flue gases of cock oven low-temperature denitration desulfurizer and technique, belong to coking industry flue gases of cock oven pollutant control technical field.Device mainly includes Benitration reactor, reheater, air-introduced machine, desulfurizing tower, desulfurization absorbing liquid heat exchanger, ammonium sulfate liquor groove, ammonium sulfate liquor circulating pump, doctor solution circulating pump and doctor solution metering conveying pump.Flue gases of cock oven carries out denitration respectively through Benitration reactor, reheater carries out the heat exchange of high/low temperature flue gases of cock oven, desulfurizing tower carries out desulfurization, is finally completed flue gases of cock oven low-temperature denitration desulfurizing and purifying and processes.Advantage is, makes full use of coke-oven plant's own resource, it is achieved the theory of " treatment of wastes with processes of wastes against one another ", checks, while the operating mode and denitration desulfurization meeting flue gases of cock oven requires, it is ensured that the continuous and stable production of coke oven through pilot scale and industrial applications.
Description
Technical field
The invention belongs to coking industry flue gases of cock oven pollutant control technical field, particularly to a kind of flue gases of cock oven
Low-temperature denitration desulfurizer and technique.Refer more particularly to the nitrogen oxides (NOx) in flue gases of cock oven, sulfur dioxide (SO2)
Processing method.
Background technology
According to the NO in coking by coke oven principle and flue gases of cock ovenX、SO2Deng the mechanism of production of pollutant, analyze and understand, burnt
NO in stove flue gasX、SO2Deng pollutant load, can only control to reduce producing, and cannot avoid producing.Meet " coking
Learn emission of industrial pollutants standard " (GB16171-2012) middle regulation emission request, it is necessary to the NO in flue gases of cock ovenX、SO2
Denitration desulfurizing and purifying process is carried out Deng pollutant, could qualified discharge.
In recent years, the improvement of flue gases of cock oven pollutant increasingly comes into one's own, and denitration sulfur removal technology technical research is also got over
Come the hottest, according to the result of study to flue gases of cock oven denitration sulfur removal technology technology announced at present it can be seen that coke oven flue
QI prostration nitre sulfur removal technology technology is the most still referred from Technology and the experience of other industry denitrating flue gas desulfurized treatment, by it
It is grafted onto coking industry, to the NO in flue gases of cock ovenX、SO2Carry out denitration desulfurization process, do not account for flue gases of cock oven with
Other industry Gas phase Smoke ratio has: temperature is low, NOXContent is high, SO2Content is low, moisture content is high, exhaust gas volumn fluctuation is big and coke oven is protected
Demonstrate,prove the features such as continuous production, and the flue gases of cock oven denitration sulfur removal technology technology that they announce is not through pilot scale or industrialization
Can application demonstration, meet the feature of flue gases of cock oven and stablize coke oven and produce continuously and also need to actual test through production
Card.
The shortcomings and deficiencies existed in view of existing flue gases of cock oven denitration sulfur removal technology technology, develop a kind of new coke oven cigarette
Road gas low-temperature denitration desulfurizer and technique.
Summary of the invention
Present invention aim at providing a kind of flue gases of cock oven low-temperature denitration desulfurizer and technique, solve coke oven flue
NO in gasX、SO2Discharge problem the most up to standard.Realize the NO in flue gases of cock ovenX、SO2Deng the process of pollutant, solve this work
Skill is based on coking system engineering, makes full use of the own resource of coke-oven plant, it is achieved the theory of " treatment of wastes with processes of wastes against one another ", to coke oven
While flue gas carries out denitration desulfurization process, utilize the thermograde of flue gases of cock oven, flue gases of cock oven after desulfurization heated up,
Discharge in former coke oven chimney, solve the hot standby problem of coke oven chimney, stablize coke oven and produce required heat buoyancy continuously.
A kind of flue gases of cock oven low-temperature denitration desulfurizer, including Benitration reactor 2, reheater 3, air-introduced machine 4, desulfurizing tower
5, desulfurization absorbing liquid heat exchanger 8, ammonium sulfate liquor groove 11, ammonium sulfate liquor circulating pump 10, doctor solution circulating pump 9 and doctor solution metering are defeated
Send pump 7.Benitration reactor 2, reheater 3, air-introduced machine 4 and desulfurizing tower 5 pass sequentially through flue gas duct and realize seamless link；Desulfurization
Connect doctor solution metering conveying pump 7, doctor solution circulating pump 9 and desulfurization by spray desulfurization absorbing liquid pipeline respectively on tower 5 to absorb
Liquid heat exchanger 8；Ammonium sulfate liquor groove 11 and ammonium sulfate liquor circulating pump 10 is connected by ammonium sulfate liquor pipeline above desulfurizing tower 5.
The denitration sulfur removal technology of a kind of above-mentioned flue gases of cock oven low-temperature denitration desulfurizer, concrete technology step and parameter are such as
Under:
1, after flue gases of cock oven mixes with denitrification reducing agent, by equipped with in the Benitration reactor 2 of denitrating catalyst,
In the presence of catalyst, to the NO in flue gases of cock ovenXCarry out catalytic oxidation-reduction reaction, produce nitrogen (N2) and water (H2O), stay
In flue gas, reach to remove NO in flue gases of cock ovenXPurpose；
2, in desulfurizing tower 5, by spray desulfurization absorbing liquid and SO in flue gases of cock oven2Carry out reverse haptoreaction, de-
Sulfur optimal reaction temperature 40～60 DEG C, generate ammonium salt, stay in desulfurization absorbing liquid, reaches to remove SO in flue gases of cock oven2Mesh
's；
3, for realize denitration desulfurization process flue gases of cock oven return coke oven smoke stack emission, in reheater 3 by desulfurization after 40
～the high temperature coke oven flue gas of 190 DEG C～320 DEG C carries out heat exchange after low temperature flue gases of cock oven and the denitration of 60 DEG C, it is achieved right
High-temperature flue gas is lowered the temperature, the purpose heating up low temperature flue gas, the thermograde of Appropriate application flue gases of cock oven.
Denitrating catalyst described in step 1 uses the low temperature catalyst being suitable for the features such as flue gases of cock oven low temperature, catalyst
Optimal reaction temperature window is 190 DEG C～350 DEG C；Described denitrification reducing agent is that liquefied ammonia, ammonia, carbamide or coke-oven plant are through processing
After ammonia；In described Benitration reactor 2, denitrating catalyst, according to NOx content in flue gases of cock oven and denitration efficiency requirement, is adopted
With N+1 layer arrangement form.
Desulfurizing tower 5 described in step 2 uses stagewise internal structure, from bottom to up, is that doctor solution caches section, desulfurization respectively
Cooling spray section, fine de-sulfur spray section, prevent the escaping of ammonia section and mist catching section；Described doctor solution caching section is according to handled coke oven cigarette
Road tolerance and SO2Content determines the height of doctor solution caching section；Described desulfurization cooling spray section enters tower temperature according to flue gases of cock oven
Degree, SO2Content, desulphurization reaction time and sprinkle density determine the height of desulfurization cooling spray section；Described fine de-sulfur spray section root
The height of fine de-sulfur spray section is determined according to the entrance flue-gas temperature of fine de-sulfur spray section, desulphurization reaction time and sprinkle density；Institute
State desulfurization cooling spray section and fine de-sulfur spray section uses sky spray tower structure；Described prevent the escaping of ammonia section according to process coke oven flue
Tolerance and ammonium sulfate liquor circulating load determine the height preventing the escaping of ammonia section, prevent the escaping of ammonia section from using plate column structure；Described catch
Arrange in mist section and catch the cyclone type mist eliminator that fog effect is higher；Described desulfurization absorbing liquid is the remained ammonia containing free ammonia and takes off
The mixture of sulfur liquid composition；Doctor solution, by doctor solution metering conveying pump 7, is sent to coke-oven plantization by pipeline and produces by described doctor solution
Ammonia still process is gone in workshop, and the remained ammonia amount that conveying capacity and coke-oven plant send here matches, it is ensured that the water balance of ammonia still process treating capacity；Described de-
Desulfurization absorbing liquid, through doctor solution circulating pump 9, is carried out heat exchange at desulfurization absorbing liquid heat exchanger 8 and recirculated cooling water by sulfur absorbing liquid
Cooling, the mist that the desulfurization absorbing liquid after cooling is arranged by the desulfurization cooling spray section of pipeline and desulfurizing tower 5, fine de-sulfur spray section
Change nozzle to connect, after atomization, absorb SO in reaction flue gas2, carry out desulfurization；Described general in doctor solution circulating pump 9 import preceding pipeline
The remained ammonia that coke-oven plant comes is added in doctor solution；Described ammonium sulfate liquor prevents ammonia ammonium sulfate liquor groove 11 and desulfurizing tower 5
Escaping intersegmental, be circulated use by ammonium sulfate liquor circulating pump 10, ammonium sulfate liquor is sent by pipeline by Hua Chan workshop, coke-oven plant
In ammonium sulfate liquor groove 11, when ammonium sulfate liquor is after absorbing ammonia, after reaching certain saturation, then produce car through sending back to of piping
Between use, new ammonium sulfate liquor is added in ammonium sulfate liquor groove 11 simultaneously.
Reheater described in step 3 uses the tubular structure that heat exchange efficiency is higher.
Flue gases of cock oven successively in step 1, step 3, step 2 complete flue gases of cock oven in NOX、SO2Deng pollution
Thing carries out denitration desulfurizing and purifying process, it is achieved qualified discharge.
It is an advantage of the current invention that and make full use of coke-oven plant's own resource, it is achieved the theory of " treatment of wastes with processes of wastes against one another ", through pilot scale
And industrial applications inspection, fully meet the operating mode of flue gases of cock oven and while denitration desulfurization requires, it is ensured that coke oven continuous
Steady production.This technique requires in the operating mode and denitration desulfurization meeting flue gases of cock oven compared with announcing denitration sulfur removal technology
Simultaneously, it is ensured that the continuous and stable production of coke oven, have that denitration desulfuration efficiency is high, it is little to take up an area, investment, operating cost low, without secondary
The features such as pollution.
Accompanying drawing explanation
Fig. 1 is the use structure graph of the flue gases of cock oven low-temperature denitration sulfur removal technology device of the present invention.Wherein, high temperature
Flue gases of cock oven 1, Benitration reactor 2, reheater 3, air-introduced machine 4, desulfurizing tower 5, low temperature flue gases of cock oven 6, doctor solution metering is defeated
Send pump 7, desulfurization absorbing liquid heat exchanger 8, doctor solution circulating pump 9, ammonium sulfate liquor circulating pump 10, ammonium sulfate liquor groove 11, ammonium sulfate liquor
12, recirculated cooling water 13, remained ammonia 14, doctor solution 15, denitrification reducing agent 16.
Detailed description of the invention
Denitrating catalyst uses the low temperature catalyst being suitable for the features such as flue gases of cock oven low temperature, catalyst optimal reaction temperature
Window is 190 DEG C～350 DEG C；The reducing agent that denitration uses is ammonia, can select to be suitable for oneself according to coke-oven plant's practical situation
Denitrification reducing agent.
Desulfurization absorbing liquid is the remained ammonia 14 containing free ammonia and the mixture of doctor solution 15 composition, remained ammonia 14
Coming from coke-oven plant's remained ammonia groove, doctor solution 14 derives from desulfurizing tower 5 bottom doctor solution caching section.
The cooling of desulfurization absorbing liquid uses coke-oven plant's recirculated cooling water 13 as low-temperature receiver, lowers the temperature desulfurization absorbing liquid, protects
Low temperature environment needed for card ammonia process and guarantee desulfuration efficiency.
The ammonium sulfate liquor 12 preventing the escaping of ammonia derives from the sulfur ammonium saturator of coke-oven plant, is sent to ammonium sulfate liquor groove 11 and stores,
When, after ammonium sulfate liquor 12 absorbing ammonia, reaching to send back to during finite concentration the ammonium sulfate workshop section of coke-oven plant.
Flue gases of cock oven system dynamic has air-introduced machine 4 to provide.
Being further elucidated with the present invention below in conjunction with the accompanying drawings, detailed description of the invention is under premised on technical solution of the present invention
Carry out implementing.
As shown in Figure 1: a kind of flue gases of cock oven low-temperature denitration sulfur removal technology and device mainly include Benitration reactor 2, again
Hot device 3, air-introduced machine 4, desulfurizing tower 5, doctor solution metering conveying pump 8, doctor solution heat exchanger 9, doctor solution circulating pump 10, ammonium sulfate liquor
Circulating pump 11, ammonium sulfate liquor groove 12.Reheater 3 is tubular structure, and desulfurizing tower 5 is stagewise internal structure, from bottom to up, point
It not doctor solution caching section, desulfurization cooling spray section, fine de-sulfur spray section, prevent the escaping of ammonia section, mist catching section, wherein desulfurization cooling
Spray section, fine de-sulfur spray section use sky spray tower structure, prevent the escaping of ammonia section from arranging in using plate column structure, mist catching section and catch mist
The cyclone type mist eliminator that effect is higher.
In conjunction with Fig. 1, the flue gases of cock oven low-temperature denitration sulfur removal technology of the present invention is described further.Produced by air-introduced machine 4
Raw suction, draws high temperature coke oven flue gas 1 from coke oven underground main chimney flue, with denitrification reducing agent 16 in flue fully
After mixing, enter into equipped with in the Benitration reactor of denitrating catalyst, in the presence of catalyst, in flue gases of cock oven NOx with
Denitrification reducing agent NH3There is catalytic oxidation-reduction reaction, NOx conversion is become N2And H2O, enters in flue gas, reaches the mesh of denitration
's；After denitration, high temperature coke oven flue gas 1 is through reheater 3, air-introduced machine 4, enters on the doctor solution caching section liquid level of desulfurizing tower 5
Portion, after denitration, after high temperature coke oven flue gas 1 and desulfurization, low temperature flue gases of cock oven 6 carries out heat exchange, to denitration in reheater 3
Rear high temperature coke oven flue gas 1 is lowered the temperature so that it is before entering desulfurizing tower 5, flue-gas temperature ＜ 140 DEG C, to low temperature coke oven after desulfurization
Flue gas 6 heats up so that it is entering coke oven chimney is flue-gas temperature ＞ 120 DEG C；The flue gas entering desulfurizing tower 5 flows up,
Respectively through desulfurization cooling spray section, the fine de-sulfur spray section within desulfurizing tower 5, prevent the escaping of ammonia section, mist catching section, through de-
During sulfur cooling spray section, fine de-sulfur spray section, SO in flue gas2Carry out absorbing reaction with spray desulfurization absorbing liquid, generate ammonium salt, stay
In doctor solution, and then SO in removing flue gas2, reaching the purpose of desulfurization, the flue gas after desulfurization processes continues to ascend into
Prevent the escaping of ammonia section, the ammonia process of desulfurization higher owing to using desulfuration efficiency, flue gas can be mingled with more or less a small amount of
Ammonia, in order to avoid ammonia escape pollute environment, prevent the escaping of ammonia section use ammonium sulfate liquor 12 ammonia is absorbed, through over cure
Ammonium mother solution 12 absorbs except the flue gas of ammonia continues to ascend into mist catching section, removes flue fog drip, processes coalitenessity through desulfurizing tower 5
Stove flue gas 6 is discharged by tower top, after reheated device 3 heats up, by coke oven smoke stack emission.The doctor solution caching section of desulfurizing tower 5 bottom
The doctor solution 15 of certain altitude to be retained, its objective is to ensure circulation consumption and the response time of doctor solution, by remained ammonia 14
With the desulfurization absorbing liquid of doctor solution 15 composition, pipe-line blending before entering doctor solution circulating pump 9, it is ensured that desulfurization absorbing liquid is swum
From the concentration of ammonia, favorably providing desulfuration efficiency, reduce the circulating load of doctor solution 15, desulfurization absorbing liquid is through desulfurization absorbing liquid heat exchange
After device 8 and recirculated cooling water 13 carry out heat exchange, the mist arranged with desulfurization cooling spray section, fine de-sulfur spray section by pipeline
Change nozzle to connect, after atomization, absorb SO in reaction flue gas2, carry out desulfurization, in order to ensure that the doctor solution of desulfurizing tower 5 bottom caches section
Liquid level equilibrium, it is desirable to the amount of supplementary remained ammonia 14, is sent to Hua Chan workshop, coke-oven plant with through doctor solution metering conveying pump 7
The amount of the doctor solution 15 of ammonia still process, keeps balance.Ammonium sulfate liquor 12 amount prevented in the escaping of ammonia section of desulfurizing tower 5, female by sulfur ammonium
Liquid circulating pump 10, in preventing the escaping of ammonia section and between ammonium sulfate liquor groove 11, is circulated use, keeps the dynamic of ammonium sulfate liquor 12 amount
State balances, and ammonium sulfate liquor 12 is sent in ammonium sulfate liquor groove 11 by pipeline by Hua Chan workshop, coke-oven plant, when ammonium sulfate liquor 12 is being inhaled
Receive after ammonia, after reaching certain saturation, then produce workshop use through sending back to of piping, new ammonium sulfate liquor 12 is supplemented simultaneously
In ammonium sulfate liquor groove 11.
Utilizing this technique, after purified treatment, flue gases of cock oven disclosure satisfy that " coking chemistry emission of industrial pollutants standard "
(GB16171-2012) Special section of regulation, NO in flue gases of cock oven inX、SO2Emission request, the coke oven flue i.e. discharged
NO in gasXContent is less than 150mg/m3、SO2Content is less than 30mg/m3, ensureing that the escaping of ammonia is less than 3ppm simultaneously, this technique also overcomes
Other technique produces waste water, waste residue problem.
Claims (5)
1. a flue gases of cock oven low-temperature denitration desulfurizer, it is characterised in that include Benitration reactor (2), reheater (3),
Air-introduced machine (4), desulfurizing tower (5), desulfurization absorbing liquid heat exchanger (8), ammonium sulfate liquor groove (11), ammonium sulfate liquor circulating pump (10), de-
Sulfur liquid circulating pump (9) and doctor solution metering conveying pump (7)；Benitration reactor (2), reheater (3), air-introduced machine (4) and desulfurizing tower
(5) pass sequentially through flue gas duct and realize seamless link；Connect de-by spray desulfurization absorbing liquid pipeline respectively on desulfurizing tower (5)
Sulfur liquid metering conveying pump (7), doctor solution circulating pump (9) and desulfurization absorbing liquid heat exchanger (8)；Desulfurizing tower (5) top is by sulfur ammonium
Mother solution pipeline connects ammonium sulfate liquor groove (11) and ammonium sulfate liquor circulating pump (10).
2. the technique of device described in a claim 1, it is characterised in that concrete steps and parameter are as follows:
1) after flue gases of cock oven mixes with denitrification reducing agent, by equipped with in the Benitration reactor (2) of denitrating catalyst, urging
In the presence of agent, to the NO in flue gases of cock ovenXCarry out catalytic oxidation-reduction reaction, produce nitrogen and water, stay in flue gas, reach
NO in removing flue gases of cock ovenXPurpose；
2) in desulfurizing tower (5), by spray desulfurization absorbing liquid and SO in flue gases of cock oven2Carrying out reverse haptoreaction, desulfurization is
Good reaction temperature 40～60 DEG C, generate ammonium salt, stay in desulfurization absorbing liquid, reaches to remove SO in flue gases of cock oven2Purpose；
3) for realize denitration desulfurization process flue gases of cock oven return coke oven smoke stack emission, in reheater (3) by desulfurization after 40～
After the low temperature flue gases of cock oven of 60 DEG C and denitration, the high temperature coke oven flue gas of 190 DEG C～320 DEG C carries out heat exchange, it is achieved to height
Temperature flue gas is lowered the temperature, the purpose heating up low temperature flue gas.
Technique the most according to claim 2, it is characterised in that step 1) described in denitrating catalyst reaction temperature be 190
DEG C～350 DEG C；Described denitrification reducing agent is liquefied ammonia, ammonia, carbamide or coke-oven plant ammonia after treatment；Described denitration reaction
In device (2), denitrating catalyst, according to NOx content in flue gases of cock oven and denitration efficiency requirement, uses N+1 layer arrangement form.
Technique the most according to claim 2, it is characterised in that step 2) described in desulfurizing tower (5) use inside stagewise
Structure, from bottom to up, is doctor solution caching section, desulfurization cooling spray section, fine de-sulfur spray section respectively, prevents the escaping of ammonia section and catch
Mist section；Doctor solution caching section is according to handled coke oven flue tolerance and SO2Content determines the height of doctor solution caching section；Desulfurization is dropped
Temperature spray section is according to flue gases of cock oven inlet temperature of stabilizer, SO2Content, desulphurization reaction time and sprinkle density determine desulfurization cooling spray
The height of section；Fine de-sulfur spray section is true according to entering the flue-gas temperature of fine de-sulfur spray section, desulphurization reaction time and sprinkle density
Determine the height of fine de-sulfur spray section；Desulfurization cooling spray section and fine de-sulfur spray section use sky spray tower structure；Prevent the escaping of ammonia section
Determine the height preventing the escaping of ammonia section according to process coke oven flue tolerance and ammonium sulfate liquor circulating load, prevent the escaping of ammonia section from using plate
Formula tower structure；Cyclone type mist eliminator is set in mist catching section；Desulfurization absorbing liquid is the remained ammonia containing free ammonia and doctor solution group
The mixture become；Doctor solution, by doctor solution metering conveying pump (7), is sent to Hua Chan workshop, coke-oven plant by pipeline and goes to steam by doctor solution
Ammonia, the remained ammonia amount that conveying capacity and coke-oven plant send here matches, it is ensured that the water balance of ammonia still process treating capacity；Desulfurization absorbing liquid is passed through
Doctor solution circulating pump (9), carries out heat exchange cooling by desulfurization absorbing liquid at desulfurization absorbing liquid heat exchanger (8) and recirculated cooling water, cold
But the desulfurization absorbing liquid after is sprayed by desulfurization cooling spray section, the atomization of fine de-sulfur spray section setting of pipeline with desulfurizing tower (5)
Mouth connects, and absorbs SO in reaction flue gas after atomization2, carry out desulfurization；By coke-oven plant in doctor solution circulating pump (9) import preceding pipeline
The remained ammonia come is added in doctor solution；Ammonium sulfate liquor prevents the escaping of ammonia section ammonium sulfate liquor groove (11) and desulfurizing tower (5)
Between, it being circulated use by ammonium sulfate liquor circulating pump (10), ammonium sulfate liquor is sent to sulfur by Hua Chan workshop, coke-oven plant by pipeline
In ammonium mother liquor tank (11), when ammonium sulfate liquor is after absorbing ammonia, after reaching certain saturation, then produce workshop through sending back to of piping
Use, new ammonium sulfate liquor is added in ammonium sulfate liquor groove (11) simultaneously.
Technique the most according to claim 2, it is characterised in that step 3) described in reheater (3) use tubular structure.
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Cited By (8)
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| CN106693695A (en) * | 2016-12-30 | 2017-05-24 | 湖州鼎诚环保科技有限公司 | Energy-saving type flue gas treating system |
| CN108686505A (en) * | 2018-07-26 | 2018-10-23 | 南京东大能源工程设计院有限公司 | A kind of flue gases of cock oven low temperature SCR denitration and waste heat recovery integrated apparatus and technique |
| CN108704455A (en) * | 2018-07-05 | 2018-10-26 | 安徽顺达环保科技股份有限公司 | A kind of flue gas desulfurization denitration dust-removing technique |
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| CN109529575B (en) * | 2018-12-26 | 2023-09-26 | 宁波大学 | Desulfurization and denitrification system for civil heating boiler |
| CN110307148A (en) * | 2019-06-27 | 2019-10-08 | 唐钢美锦（唐山）煤化工有限公司 | A kind of coking desulfurization systems pumps cooling water emergency treatment device and technique |
| CN112844041A (en) * | 2021-01-27 | 2021-05-28 | 太原理工大学 | Process for desulfurization and denitrification of coking wastewater |
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