CN109316962A - Middle low temperature SCR denitration urea pyrolysis and catalyst regeneration integral process - Google Patents
Middle low temperature SCR denitration urea pyrolysis and catalyst regeneration integral process Download PDFInfo
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- CN109316962A CN109316962A CN201811380706.XA CN201811380706A CN109316962A CN 109316962 A CN109316962 A CN 109316962A CN 201811380706 A CN201811380706 A CN 201811380706A CN 109316962 A CN109316962 A CN 109316962A
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- flue
- urea
- flue gas
- scr denitration
- low temperature
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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
-
- 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
- B01D53/88—Handling or mounting catalysts
-
- 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
- B01D53/90—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
- B01D53/96—Regeneration, reactivation or recycling of reactants
-
- 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
-
- 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
The invention discloses a kind of middle low temperature SCR denitration urea pyrolysis and catalyst regeneration integral process, the SCR denitration uses Benitration reactor, the Benitration reactor includes flue, the urea pyrolysis burns to generate in high-temperature flue gas in combustion furnace to carry out, it is characterised in that includes the following steps: to extract the flue gas after the desulfurization of flue inner part 1), using blower system and burns in afterburner system as oxidant；2), the high-temperature flue gas that burning generates is mixed with the urea liquid that urea injection system is sprayed；3) after, being mixed by flue gas hybrid system with original flue gas, enter as denitrification reducing agent and carry out denitration in SCR reactor.The process equipment dosage is few, effectively reduces energy consumption.
Description
Technical field
The present invention relates to a kind of middle low temperature SCR denitration urea pyrolysis and catalyst regeneration integral process.
Background technique
Raising with country to environmental requirement, existing steel plant's vent gas treatment is using wet desulphurization+burner+urea heat
Solve the mode denitration of (hydrolysis)+middle low temperature SCR denitration.Wherein urea pyrolysis generallys use electric heating or steam-heated mode will
Air blower bring heat medium temperature, which is promoted to 650 DEG C, enters pyrolysis oven, injects urea solution into heat by urea injection system
It solves in furnace, urea liquid encounters direct boiling after high-temperature gas and is pyrolyzed into ammonia, generates ammonia and is entered in flue by pipeline
It is mixed after ammonia-spraying grid with flue gas, with flue gas into denitration in middle low-temperature SCR reactor.After wet desulphurization, flue-gas temperature
It is universal relatively low, SCR reactor is unable to satisfy to temperature requirement, therefore flue-gas temperature is improved by afterburner again.Its afterburner is general
Using blast furnace gas or oven gas as fuel, as combustion adjuvant, the high-temperature flue gas after burning is mixed with desulfidation tail gas to be risen air
Requirement of the warm guarantee system to temperature.Because can generate hydrogen sulfate ammonia under middle low temperature (180-220 DEG C) environment is attached to catalyst
Surface causes catalyst activity to fail, and catalyst, which needs to regenerate, to be used, and needs catalyst to return factory's regeneration, seriously affects and be
System production.Disadvantage that there is only process routes is complicated for this original technology, equipment is more, site requirements is big, energy consumption is high, and catalysis
Agent regenerative process is complicated, system need to shut down processing, is affected to production process.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of middle low temperature SCR denitration urea pyrolysis and catalyst regenerations one
Body chemical industry skill, the process equipment dosage is few, effectively reduces energy consumption.
In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:
A kind of middle low temperature SCR denitration urea pyrolysis and catalyst regeneration integral process provided by the invention, the SCR denitration
Using Benitration reactor, the Benitration reactor includes flue, and the urea pyrolysis burns in combustion furnace to be generated in high-temperature flue gas
It carries out, includes the following steps:
1) flue gas after, extracting the desulfurization of flue inner part using blower system is as oxidant in afterburner system internal combustion
It burns；
2), the high-temperature flue gas that burning generates is mixed with the urea liquid that urea injection system is sprayed；
3) after, being mixed by flue gas hybrid system with original flue gas, enter in SCR reactor as denitrification reducing agent and taken off
Nitre.
As further improvement of the invention: the blower system will using the first booster fan and the second booster fan
Blast furnace gas or oven gas, which are sent into, mends burning in gas burning system.
As further improvement of the invention: first booster fan and the second booster fan are used and are connected in parallel.
As further improvement of the invention: the blower system is connected to by first pipe with desulfurization rear pass.
As further improvement of the invention: pressing volume percentage, the flue gas oxygen content of the desulfurization rear pass is 16%
More than.
Improved as of the invention further: by afterburner system will be promoted in the flue-gas temperature short time to 280 DEG C with
On, after realizing catalyst regeneration, then adjust afterburner system operational parameters.
As further improvement of the invention: the urea injection system includes spray gun, compressed air line, wash tub pipe
Road returns to urea liquid storage box pipeline；The urea liquid sprays into the height mended and generated in gas burning system in burning using spray gun
Pyrolysis is at ammonia in 900 DEG C or so of warm flue-gas temperature.
As further improvement of the invention:
Burner noz(zle) and urea nozzle are provided in the afterburner system；
The blower system is connected with afterburner system by burner noz(zle)；The urea injection system and afterburner system
It is connected by urea nozzle, the afterburner system is connected with flue；The flue gas hybrid system is arranged in inside flue.
As further improvement of the invention: the flue gas hybrid system is the flue mixer being set in flue, institute
Stating flue mixer is static mixer.
A kind of middle low temperature SCR denitration urea pyrolysis and catalyst regeneration integral process provided by the invention, in afterburning
Flue gas heating and urea pyrolysis are realized in device system, reduce pyrolysis oven in traditional handicraft, heater, air blower, ammonia-spraying grid
Etc. equipment, be effectively simplified equipment, reduce energy consumption.Original burner and urea pyrolysis furnace are organically combined.Utilize burning
The high-temperature flue gas heat of device is for being pyrolyzed urea liquid.Original burner cooks combustion adjuvant using air, and original system will increase
Exhaust gas volumn increases place capacity.Now using original flue gas as combustion adjuvant, flue gas is taken from also in flue gas, is not increased additionally
Flue gas flow facilitates energy saving.Oxygen content in flue gas is further decreased, the pollutant of present steel plant is required to by 16%
Conversion, can further decrease oxygen content in flue gas using the technique, be more advantageous to the control of pollutant.
Detailed description of the invention
Fig. 1 is that a kind of middle low temperature SCR denitration urea pyrolysis and catalyst regeneration integral process provided by the invention are former
Manage structure chart.
Fig. 2 is a kind of middle low temperature SCR denitration urea pyrolysis and catalyst regeneration integral process provided by the invention
Afterburning gas system construction drawing.
In figure: 1- afterburner system；2- urea injection system；3- flue gas hybrid system；4- blower system；5-SCR are anti-
Answer device；A, compressed air；B, flushing water；C, urea liquid storage box is returned；D, urea injection system；E, the first booster fan；
F, the second booster fan；G, the blast furnace gas or oven gas come；H, spray gun.
Specific embodiment
Below by way of specific embodiment to a kind of middle low temperature SCR denitration urea pyrolysis provided by the invention and catalyst
Regeneration integral process does further more detailed description:
Embodiment 1
The middle low temperature SCR denitration urea pyrolysis and catalyst regeneration integral process of the present embodiment, the SCR denitration is using de-
Nitre reactor, the Benitration reactor include that urea pyrolysis described in flue carries out in combustion furnace burning generation high-temperature flue gas, are asked
Referring to shown in Fig. 1, include the following steps:
1) flue gas after, extracting the desulfurization of flue inner part using blower system 4 is as oxidant in 1 internal combustion of afterburner system
It burns；
2), the high-temperature flue gas that burning generates is mixed with the urea liquid that urea injection system 2 is sprayed；
3) after, being mixed by flue gas hybrid system 3 with original flue gas, enter in SCR reactor as denitrification reducing agent and taken off
Nitre.
The blower system 4 is sent blast furnace gas or oven gas g using the first booster fan e and the second booster fan f
Enter to mend burning in gas burning system.
The first booster fan e and the second booster fan f is used and is connected in parallel.
The blower system 4 is connected to by first pipe with desulfurization rear pass.
By volume percentage, the flue gas oxygen content of the desulfurization rear pass is 16% or more.
It will be promoted in the flue-gas temperature short time to 280 DEG C or more by afterburner system 1, after realizing catalyst regeneration, then
Adjust 1 operating parameter of afterburner system.
The urea injection system 2 includes spray gun h, compressed air line, flushing water b pipeline, returns to urea liquid storage
Case c pipeline, the urea liquid is sprayed into using spray gun h to be mended in gas burning system 1 on 900 DEG C of left sides of high-temperature flue-gas that burning generates
Pyrolysis is at ammonia in right.
Burner noz(zle) and urea nozzle are provided in the afterburner system 1；
The blower system 4 is connected with afterburner system 1 by burner noz(zle)；The urea injection system 2 and afterburner
System 1 is connected by urea nozzle, and the afterburner system 1 is connected with flue；The flue gas hybrid system 3 is arranged in flue
Portion.
The flue gas hybrid system is the flue mixer being set in flue, and the flue mixer is static mixing
Device.Static mixer is the conventional equipment of the art.
In figure: 1- afterburner system；2- urea injection system；3- flue gas hybrid system；4- blower system；5-SCR are anti-
Answer device；A, compressed air；B, flushing water；C, urea liquid storage box is returned；D, urea injection system；E, the first booster fan；
F, the second booster fan；G, the blast furnace gas or oven gas come；H, spray gun.
Principle: at the same according to hydrogen sulfate ammonia at 280 DEG C resolvent characteristic, when catalyst activity reduces to a certain extent
When, the smoke temperature short time is promoted to 280 DEG C or more using afterburner, hydrogen sulfate ammonia encounters pyrolytic, realizes catalyst again
It is raw, afterburner operating parameter is adjusted again after the completion of regeneration, is operated normally.In catalyst regeneration process, without shutting down, denitrating system
Also it can operate normally, be not in NOx excessive problem.When catalyst regeneration, it is only necessary to 1 operating parameter of afterburner system is adjusted,
Most total smoke temperature is promoted to 280 DEG C or more, operation a period of time, adjusts afterburner operating parameter again after the completion of regeneration, it is normal to transport
Row.
Operating process: the characteristics of utilizing steel industry flue gas oxygen content higher (16% or more) is taken out using blower system 4
Flue gas after taking the desulfurization of part, come the blast furnace gas that burns, burns as oxidant in afterburner system 1, the height for generation of burning
After warm flue gas is mixed with the urea liquid that urea injection system 2 is sprayed, urea pyrolysis generates ammonia, passes through flue gas hybrid system 3
After being sufficiently mixed with original flue gas, enter denitration in SCR reactor 5 as denitrification reducing agent.
It should be appreciated that the purposes of these embodiments is merely to illustrate the present invention and is not intended to limit protection model of the invention
It encloses.In addition, it should also be understood that, after reading the technical contents of the present invention, those skilled in the art can make the present invention each
Kind change, modification and/or variation, all these equivalent forms equally fall within guarantor defined by the application the appended claims
Within the scope of shield.
As known by the technical knowledge, the present invention can pass through the embodiment party of other essence without departing from its spirit or essential feature
Case is realized.Therefore, embodiment disclosed above, in all respects are merely illustrative, not the only.Institute
Have within the scope of the present invention or is included in the invention in the change being equal in the scope of the present invention.
Claims (10)
- Low temperature SCR denitration urea pyrolysis and catalyst regeneration integral process in 1., the SCR denitration use denitration reaction Device, the Benitration reactor include flue, and the urea pyrolysis burns to generate in high-temperature flue gas in combustion furnace to carry out, and feature exists In including the following steps:1) flue gas after, extracting the desulfurization of flue inner part using blower system is as oxidant in afterburner system internal combustion It burns；2), the high-temperature flue gas that burning generates is mixed with the urea liquid that urea injection system is sprayed；3) after, being mixed by flue gas hybrid system with original flue gas, enter in SCR reactor as denitrification reducing agent and taken off Nitre.
- 2. middle low temperature SCR denitration urea pyrolysis according to claim 1 and catalyst regeneration integral process, feature Be: blast furnace gas or oven gas are sent into afterburning gas using the first booster fan and the second booster fan by the blower system Burning in system.
- 3. middle low temperature SCR denitration urea pyrolysis according to claim 2 and catalyst regeneration integral process, feature Be: first booster fan and the second booster fan are used and are connected in parallel.
- 4. middle low temperature SCR denitration urea pyrolysis according to claim 1 and catalyst regeneration integral process, feature Be: the blower system is connected to by first pipe with desulfurization rear pass.
- 5. middle low temperature SCR denitration urea pyrolysis according to claim 1 and catalyst regeneration integral process, feature Be: by volume percentage, the flue gas oxygen content of the desulfurization rear pass is 16% or more.
- 6. middle low temperature SCR denitration urea pyrolysis according to claim 1 and catalyst regeneration integral process, feature It is: will be promoted in the flue-gas temperature short time to 280 DEG C or more by afterburner system, after realizing catalyst regeneration, then adjusted Afterburner system operational parameters.
- 7. middle low temperature SCR denitration urea pyrolysis according to claim 1 and catalyst regeneration integral process, feature Be: the urea injection system includes spray gun, compressed air line, flushing pipe, returns to urea liquid storage box pipeline； The urea liquid using spray gun spray into mend gas burning system in burning generate 900 DEG C of high-temperature flue-gas or so in pyrolysis at Ammonia.
- 8. middle low temperature SCR denitration urea pyrolysis according to claim 1 and catalyst regeneration integral process, feature It is:Burner noz(zle) and urea nozzle are provided in the afterburner system；The blower system is connected with afterburner system by burner noz(zle)；The urea injection system and afterburner system It is connected by urea nozzle, the afterburner system is connected with flue；The flue gas hybrid system is arranged in inside flue.
- 9. middle low temperature SCR denitration urea pyrolysis and catalyst regeneration integral process according to claim 1 or 8, Be characterized in that: the flue gas hybrid system is the flue mixer being set in flue, and the flue mixer is static mixing Device.
- 10. low temperature SCR denitration urea pyrolysis ammonia system according to claim 1, it is characterised in that: afterburning gas system System includes combustion furnace and is set to burning furnace bottom for urea pyrolysis and mixed device, the urea pyrolysis and mixed dress The combustion zone including being set to lowermost end is set, mixed zone is set to above the combustion zone, and in the bottom sides of combustion zone It is provided with burner noz(zle).
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| CN201811380706.XA CN109316962A (en) | 2018-11-20 | 2018-11-20 | Middle low temperature SCR denitration urea pyrolysis and catalyst regeneration integral process |
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| CN201811380706.XA CN109316962A (en) | 2018-11-20 | 2018-11-20 | Middle low temperature SCR denitration urea pyrolysis and catalyst regeneration integral process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114405265A (en) * | 2021-12-31 | 2022-04-29 | 新兴铸管股份有限公司 | Coke oven flue desulfurization and denitrification system |
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| US20100055014A1 (en) * | 2000-12-01 | 2010-03-04 | Fuel Tech, Inc. | Selective Catalytic Reduction of NOx Enabled by Urea Decomposition Heat-Exchanger Bypass |
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| CN114405265A (en) * | 2021-12-31 | 2022-04-29 | 新兴铸管股份有限公司 | Coke oven flue desulfurization and denitrification system |
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