CN107029531A - The desulfurization of industrial smoke, dedusting denitrification integral handling process - Google Patents
The desulfurization of industrial smoke, dedusting denitrification integral handling process Download PDFInfo
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- CN107029531A CN107029531A CN201710332667.5A CN201710332667A CN107029531A CN 107029531 A CN107029531 A CN 107029531A CN 201710332667 A CN201710332667 A CN 201710332667A CN 107029531 A CN107029531 A CN 107029531A
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- dedusting
- flue gas
- desulfurization
- flue
- denitrification integral
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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
- B01D53/75—Multi-step processes
-
- 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
- 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
- B01D53/80—Semi-solid phase processes, i.e. by using slurries
-
- 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
- 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
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
A kind of desulfurization of industrial smoke disclosed by the invention, dedusting denitrification integral handling process, it is characterised in that comprise the following steps：(1) desulfurization process：160~240 DEG C of flue gas is directly entered in desulfurizing tower under air-introduced machine effect by flue, carries out desulphurization reaction, removes SO2, the flue gas after desulfurization is into modular radial dedusting Benitration reactor, and desulfurizing tower on the connection flue of modular radial dedusting Benitration reactor with being provided with spray ammonia system；(2) dedusting denitrification integral is handled：The ammonia that ammonia system ejection is sprayed on flue gas and flue after desulfurization is mixed into modular radial dedusting Benitration reactor, then carries out dedusting denitration；(3) flue gas up to standard after desulfurization, dedusting, denitration process is pumped to smoke stack emission through air-introduced machine, this invention simplifies handling process, reduce plant investment and floor space, alleviate influence of the dust to catalyst, extend catalyst service life, operating cost is reduced, resource utilization is improved.
Description
Technical field
The present invention relates to filed of flue gas purification, specifically a kind of desulfurization of industrial smoke, dedusting denitrification integral processing work
Skill.
Background technology
China is coal-fired big country, and the production process such as fire coal, coking, glass can all produce a certain amount of dust, SO2, nitrogen oxygen
Compound and harmful metal elements etc., NO in flue gasXDischarge compare SO2Harm to environment is even more serious, the row of a large amount of nitrogen oxides
The a series of environmental problem such as acid rain, photochemical fog, depletion of the ozone layer and greenhouse effects can be caused by putting, particularly national in recent years
Serious " haze " phenomenon that most of place occurs, it has its source in the discharge of nitrogen oxides, control NO_x in Air Environment
Discharge causes the concern in the whole world, while being also the emphasis and difficult point protected in the current atmospheric environment of China, therefore, NOXPlace
Reason is particularly important.
According to current market trend, desulfurization is divided into dry method, semidry method and wet method, is promoted in national long-term environmental protection policy
Under, its most of technique is all very ripe, stable；Denitration is main based on SCR (SCR) technology, its technology into
It is ripe, efficiently and be widely used.
Domestic at present there are many flue gas desulfurization and denitrification residual heat integrative processing systems, its technical process be by denitration,
Waste heat, desulfurization unit are together in series, to reach the purpose of the comprehensive regulation.But all many problems of generally existing：
1st, SCR denitration can be divided into high temperature catalyst (300~400 DEG C), middle low temperature catalyst (180~300 DEG C)
Two kinds：High temperature catalyst is widely used in power industry at present, and technology is highly developed；Middle low temperature catalyst is currently only used for Jiao
The minority industry such as change, glass, is remained in certain technical risk, the problems such as principal risk is the anti-dust of catalyst, sulfur resistive, simultaneously
Traditional SCR denitration typically uses honeycomb bulk-mode, modularization assembling, and denitrification apparatus takes up an area big, one-time investment height, separately
Outer air speed is low, and catalyst amount is big, and utilization rate is relatively low.
2nd, wet desulphurization effect preferably, is widely applied to industry-by-industry, but can cause secondary dirt in sulfur removal technology
Dye, severe corrosion equipment, water consumption is high, floor space is big, and investment operating cost is high；Country can also enter to the accounting of wet desulphurization
The certain control of row.Semi-dry desulphurization technology is also ripe, will slowly replace wet desulphurization.
Although there is the technique administered to smoke comprehensive at present, from using, in terms of investment for also have many problems to need
Solve.
The content of the invention
It is an object of the invention to provide a kind of desulfurization of industrial smoke, dedusting denitrification integral handling process, to solve
The problem of being proposed in above-mentioned background technology.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：
The desulfurization of industrial smoke, dedusting denitrification integral handling process, it is characterised in that comprise the following steps：
(1) desulfurization process：Using semi-dry desulphurization technology, 160~240 DEG C of flue gas is straight by flue under air-introduced machine effect
Tap into desulfurizing tower, after flue gas is uniformly mixed with desulfurizing agent, process water, remove SO2, flue gas after desulfurization enters combined type footpath
To dedusting Benitration reactor, desulfurizing tower on the connection flue of modular radial dedusting Benitration reactor with being provided with spray ammonia system；
(2) dedusting denitrification integral is handled：The ammonia that ammonia system ejection is sprayed on flue gas and flue after desulfurization is mixed into
In modular radial dedusting Benitration reactor, high temperature resistant cloth bag is first passed around, by the dust carried secretly in flue gas, micro sulphur ammonium salt
And heavy metallic oxide is filtered in cloth bag smooth surface, the NO that the flue gas after dedusting enters in beds, flue gasXWith
Ammonia carries out the NO in denitration reaction, removing flue gas in the presence of the graininess low-temperature SCR catalyst in bedsX；
(3) flue gas up to standard after desulfurization, dedusting, denitration process is pumped to smoke stack emission through air-introduced machine.
It is preferred that, when flue-gas temperature is higher than 240 DEG C in step (1), flue gas enters waste-heat recovery device by flue so that cigarette
Then the temperature control of gas is entered flue gas in desulfurizing tower by waste-heat recovery device at 160~240 DEG C.
It is preferred that, the spray ammonia system in step (2) includes ammonia-spraying grid, static mixer, dilution air.
It is preferred that, a process water part for technique water system is mixed for desulfurizing agent with flue gas in step (1), another part
Humidity and temperature for adjusting flue gas.
It is preferred that, desulfurizing tower shares Desulphurization conveying device with modular radial dedusting Benitration reactor.
It is preferred that, modular radial dedusting Benitration reactor is to integrate dedusting, two kinds of functions of denitration in step (2)
Equipment.
It is preferred that, catalyst uses low-temperature SCR in graininess to urge in modular radial dedusting Benitration reactor in step (2)
Agent, flue gas passes through beds in a radial manner.
The beneficial effects of the invention are as follows：
The desulfurization for the industrial smoke that present invention process is provided, dedusting denitrification integral handling process, this process route is by original
Three processes come are reduced to two processes, cancel traditional SCR denitration reactor, substantially reduce project one-time investment expense,
Installation area is reduced, while the cost in terms of later stage operation maintenance can also decline to a great extent；When flue gas passes through high temperature cloth bag,
The dust carried secretly in flue gas, micro sulphur ammonium salt and heavy metallic oxide etc. are filtered down in cloth bag smooth surface, so
Flue gas after filtering influences very little to the catalyst after cloth bag, is effectively protected catalyst；Using pellet type catalyst, it has
There are the characteristics such as mechanical strength height, service life is long, and specific surface area is big, reaction motive force is big, while denitration efficiency is ensured,
Catalyst amount can be reduced again；Because flue gas through cloth bag has flow velocity slow, the characteristic such as smoke distribution is uniform, same flue gas exists
Into also having the characteristics such as flow velocity is slow, smoke distribution is uniform during beds, there is very big benefit to denitration reaction.So
Flow field simulation need not be done relative to traditional SCR denitration reactor, it is not necessary to increase flue gas even distribution device, ensureing denitration efficiency
While, reduce investment and occupation area of equipment；Change used honeycombed catalyst in the past, using pellet type catalyst, flue gas
Flow pattern is from being axially changed into radially, and flue gas carries out pellet type catalyst bed with the flow pattern of radial direction, its turbulent flow flowed
Degree and with the impact severity of catalyst relative in honeycomb catalyst bed layer, axially flowing can all be significantly increased, so meeting
Reduction denitrating catalyst usage amount simultaneously extends catalyst usage cycles, the characteristics of being provided simultaneously with not parking more catalyst changeout.
Brief description of the drawings
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description.
Fig. 1 is the process chart of the present invention.
In figure：1st, desulfurizing tower, 2, void tower structure, 3, venturi section, 4, three Fluid sprayers, 5, absorbent preparation system, 6,
Compressed air system, 7, technique water system, 8, modular radial dedusting Benitration reactor, 9, ammonia-spraying grid, 10, static mixing
Device, 11, dilution air, 12, Desulphurization conveying device, 13, air-introduced machine.
Embodiment
Technical scheme is clearly and completely described below in conjunction with accompanying drawing, it is clear that described implementation
Example is a part of embodiment of the invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill
The every other embodiment that personnel are obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
As shown in figure 1, the desulfurization for the industrial smoke that the present invention is provided, dedusting denitrification integral handling process, its feature exist
In comprising the following steps：
1) desulfurization process：Using semi-dry desulphurization technology, semi-dry desulfurizing process includes CFB methods and SDA methods, the present embodiment
By taking CFB methods as an example, if flue-gas temperature is higher than 240 DEG C, flue gas enters waste-heat recovery device by flue so that the temperature of flue gas
Then control entered flue gas in desulfurizing tower 1 by waste-heat recovery device, if 160~240 DEG C of flue gas is drawing at 160~240 DEG C
Blower fan 13 is directly entered 1 in desulfurizing tower under acting on by flue, and the desulfurizing tower 1 includes void tower structure 2, venturi section 3 and three
Fluid sprayer 4, three Fluid sprayer 4 respectively connected absorbent preparation system 5 outside desulfurizing tower 1, compressed air system
6th, technique water system 7, the venturi section 3 that flue gas first passes through the lower end of desulfurizing tower 1 accelerates, then passes through three with absorbent preparation system 5
The desulfurizing agent and technique water system 7 that Fluid sprayer 4 sprays are sprayed in the presence of compressed air system 6 by three Fluid sprayers 4
The process water mixing gone out, then forms recirculating fluidized bed in void tower structure 2, carries out desulphurization reaction, remove SO2, reaction generation
Product and dust go out with flue gas from desulfurizing tower top row, into modular radial dedusting Benitration reactor 8, desulfurizing tower 1 is with combining
Spray ammonia system is provided with the connection flue of formula radial direction dedusting Benitration reactor 8；
(2) dedusting denitrification integral is handled：The ammonia that ammonia system ejection is sprayed on flue gas and flue after desulfurization is mixed into
In modular radial dedusting Benitration reactor 8, high temperature resistant cloth bag is first passed around, by the dust carried secretly in flue gas, micro sulphur ammonium
Salt and heavy metallic oxide are filtered in cloth bag smooth surface, the NO that the flue gas after dedusting enters in beds, flue gasX
With being carried out in the presence of graininess low-temperature SCR catalyst of the ammonia in beds in denitration reaction, removing flue gas
NOX；
(3) flue gas up to standard after desulfurization, dedusting, denitration process is pumped to smoke stack emission through air-introduced machine 13.
Spray ammonia system in step (2) includes ammonia-spraying grid 9, static mixer 10, dilution air 11, and the external world is for next ammonia
Gas enters in static mixer 10, and the cold air sent into dilution air 11 is sufficiently mixed, and concentration is down to its explosion limit
Hereinafter, then the mixed gas of ammonia and air is uniformly sprayed into flue gas by ammonia-spraying grid 9.
A process water part for technique water system 7 is mixed for desulfurizing agent with flue gas in step (1), and another part is used to adjust
The humidity and temperature of flue gas are saved, smoke moisture is bigger, and its desulfurized effect is better.
Desulfurizing tower 1 shares Desulphurization conveying device 12, Desulphurization conveying device with modular radial dedusting Benitration reactor 8
12 mainly collect the Desulphurization that the bottom of desulfurizing tower 1 and modular radial dedusting Benitration reactor 8 are discharged, the Desulphurization one of collection
Part returns to continue cycling through in desulfurizing tower 1 and used, and another part is delivered to ash silo and sent outside, and Desulphurization conveying device purpose is to set up steady
Fixed fluid bed, reduction absorbent consumption, the need for meeting desulphurization reaction.
Modular radial dedusting Benitration reactor 8 is to integrate dedusting, the equipment of two kinds of functions of denitration in step (2).
Catalyst uses low-temperature SCR catalyst in graininess in modular radial dedusting Benitration reactor 8 in step (2),
Flue gas passes through beds in a radial manner.
The embodiments of the present invention described above are not intended to limit the scope of the present invention, any in the present invention
Spirit and principle within the modifications, equivalent substitutions and improvements made etc., should be included in the claim protection model of the present invention
Within enclosing.
Claims (7)
1. the desulfurization of industrial smoke, dedusting denitrification integral handling process, it is characterised in that comprise the following steps：
(1) desulfurization process：Using semi-dry desulphurization technology, 160~240 DEG C of flue gas is directly entered under air-introduced machine effect by flue
Enter in desulfurizing tower, after flue gas is uniformly mixed with desulfurizing agent, process water, remove SO2, the flue gas after desulfurization removes into modular radial
Dirt Benitration reactor, desulfurizing tower on the connection flue of modular radial dedusting Benitration reactor with being provided with spray ammonia system；
(2) dedusting denitrification integral is handled：Flue gas after desulfurization is mixed into the ammonia that spray ammonia system sprays on flue to be combined
In formula radial direction dedusting Benitration reactor, first pass around high temperature resistant cloth bag, by the dust carried secretly in flue gas, micro sulphur ammonium salt and
Heavy metallic oxide is filtered in cloth bag smooth surface, the NO that the flue gas after dedusting enters in beds, flue gasXWith ammonia
The NO in denitration reaction, removing flue gas is carried out in the presence of graininess low-temperature SCR catalyst in bedsX；
(3) flue gas up to standard after desulfurization, dedusting, denitration process is pumped to smoke stack emission through air-introduced machine.
2. the desulfurization of industrial smoke, dedusting denitrification integral handling process according to claim 1, it is characterised in that described
When flue-gas temperature is higher than 240 DEG C in step (1), flue gas enters waste-heat recovery device by flue so that the temperature control of flue gas exists
160~240 DEG C, then flue gas is entered in desulfurizing tower by waste-heat recovery device.
3. the desulfurization of industrial smoke, dedusting denitrification integral handling process according to claim 1, it is characterised in that described
Spray ammonia system in step (2) includes ammonia-spraying grid, static mixer, dilution air.
4. the desulfurization of industrial smoke, dedusting denitrification integral handling process according to claim 1, it is characterised in that described
A process water part for technique water system is mixed for desulfurizing agent with flue gas in step (1), and another part is used to adjust flue gas
Humidity and temperature.
5. the desulfurization of industrial smoke, dedusting denitrification integral handling process according to claim 1, it is characterised in that described
Desulfurizing tower shares Desulphurization conveying device with modular radial dedusting Benitration reactor.
6. the desulfurization of industrial smoke, dedusting denitrification integral handling process according to claim 1, it is characterised in that described
Modular radial dedusting Benitration reactor is to integrate dedusting, the equipment of two kinds of functions of denitration in step (2).
7. the desulfurization of industrial smoke, dedusting denitrification integral handling process according to claim 1, it is characterised in that described
Catalyst uses low-temperature SCR catalyst in graininess in modular radial dedusting Benitration reactor in step (2), and flue gas is with radially
Mode passes through beds.
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| CN201710332667.5A CN107029531A (en) | 2017-05-12 | 2017-05-12 | The desulfurization of industrial smoke, dedusting denitrification integral handling process |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109663496A (en) * | 2017-10-17 | 2019-04-23 | 中国石油化工股份有限公司 | A method of removing sulfureous in flue gas oxide and/or nitrogen oxides |
| CN111036072A (en) * | 2019-12-13 | 2020-04-21 | 西安润川环保科技有限公司 | Flue gas treatment system |
| CN114471113A (en) * | 2022-03-09 | 2022-05-13 | 山东康源环保科技有限公司 | Integrated synergistic treatment process for smoke dust, nitrate and sulfur NMHC in coking industry |
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| CN106582232A (en) * | 2017-02-08 | 2017-04-26 | 江苏佳鑫环保工程有限公司 | Synergistic removal tending to zero discharge purification process and equipment for multicomponent pollutants in flue gas |
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| CN202683052U (en) * | 2012-06-26 | 2013-01-23 | 无锡高达环境科技有限公司 | Front semi-dry gas desulfurization system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109663496A (en) * | 2017-10-17 | 2019-04-23 | 中国石油化工股份有限公司 | A method of removing sulfureous in flue gas oxide and/or nitrogen oxides |
| CN109663496B (en) * | 2017-10-17 | 2021-09-07 | 中国石油化工股份有限公司 | Method for removing sulfur oxides and/or nitrogen oxides in flue gas |
| CN111036072A (en) * | 2019-12-13 | 2020-04-21 | 西安润川环保科技有限公司 | Flue gas treatment system |
| CN114471113A (en) * | 2022-03-09 | 2022-05-13 | 山东康源环保科技有限公司 | Integrated synergistic treatment process for smoke dust, nitrate and sulfur NMHC in coking industry |
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Application publication date: 20170811 |