CN105879620A - Two-stage flue gas sulphur trioxide removing device and method for flue gas purification - Google Patents
Two-stage flue gas sulphur trioxide removing device and method for flue gas purification Download PDFInfo
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- CN105879620A CN105879620A CN201610313045.3A CN201610313045A CN105879620A CN 105879620 A CN105879620 A CN 105879620A CN 201610313045 A CN201610313045 A CN 201610313045A CN 105879620 A CN105879620 A CN 105879620A
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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
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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
- B01D53/14—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 by absorption
- B01D53/1406—Multiple stage absorption
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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
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur 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
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
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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
- B01D2251/30—Alkali metal compounds
- B01D2251/304—Alkali metal compounds of sodium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
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- 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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Abstract
The invention provides a two-stage flue gas sulphur trioxide removing device for flue gas purification, which is mounted in an SCR (Selective Catalytic Reduction) denitrification system. The two-stage flue gas sulphur trioxide removing device comprises a first-stage absorption section which is arranged at an inlet flue of the SCR denitrification system and comprises a first-stage absorbent jetting device, and a second-stage absorption section which is arranged at an outlet flue of the SCR denitrification system and comprises a second-stage absorbent jetting device. A first-stage absorbent is jetted into flue gas from the upstream of the SCR to absorb sulphur trioxide in the flue gas so as to reduce the concentration of the sulphur trioxide at the inlet of an SCR denitrification reactor; a second-stage absorbent is jetted into an SCR denitrification outlet flue to remove the residual sulphur trioxide and the sulphur trioxide which is generated by the oxidation of an SCR denitrification catalyst. On one hand, the generation of ABS (Alkyl Benzene Sulfonate) is reduced, and the risks of the corrosion and the blockage of tail equipment and a heat exchange surface are reduced; on the other hand, harmful components emitted to the atmosphere are reduced. Meanwhile, the invention provides a two-stage flue gas sulphur trioxide removing method for the flue gas purification based on the device.
Description
Technical field
The present invention relates to environmental technology field, particularly to a kind of sulfur trioxide removing means for coal-fired flue-gas deep purifying,
It is specifically related to a kind of two-stage sulfur trioxide in flue gas removing means for gas cleaning and method.
Background technology
At present, each department Air Pollutant Emission is according to overall control, and particularly fossil-fired unit is already required to implement integrally
Pollutant minimum discharge standard.December in 2015 is held the State Council of the PRC's standing meeting on the 2nd and is determined to implement in full
Coal-burning power plant's minimum discharge and reducing energy consumption, be greatly reduced gross coal consumption rate and disposal of pollutants.Mean China's coal fired thermal power plant discharge
The concentration of nitrogen oxides in effluent all will be less than 50mg/Nm3。
China's coal-fired flue gas denitration mainly takes SCR denitration technology, is presently the most conventional denitration technology, SCR denitration technology
Its principle is by spraying into ammonia in flue gas as reducing agent, under the effect of denitrating catalyst, by the nitrogen oxides in flue gas
It is reduced to N2.Enter in the flue gas of SCR denitration system and usually contain certain density sulfur trioxide, SCR denitration can be caused to be catalyzed
Agent occurs that sour gas is poisoned.Owing to sulfur trioxide contained in the flue gas of entrance SCR denitration reactor can cause SCR denitration to be urged
Agent is poisoned, and affects denitrating flue gas efficiency, and the ammonia escaped with SCR denitration system cooperatively forms ABS, causes afterbody
Heated surface corrosion and blocking, when sulfur trioxide concentration is higher, after flue-gas temperature is down to dew point, can be to back-end surfaces shape
Become sour corrosion, have a strong impact on power station equipment safety in operation and economy.
It addition, according to SCR denitration response characteristic, in order to reach higher denitration efficiency, it is achieved the deep removal of nitrogen oxides,
Need in flue gas, to spray into more substantial ammonia, to promote the carrying out of reduction reaction.When spraying into ammonia amount and being too high, it is easily caused
Denitrating system rear portion amount of ammonia slip increases considerably, owing to flue gas existing certain density sulfur trioxide, and the dioxy in flue gas
Change sulfur and be oxidized to sulfur trioxide having part after SCR denitration, increase further ABS and generate risk.?
In the presence of ammonia, ammonium hydrogen sulfate can be produced, cause flue gas upstream device that serious corrosion and blocking occur.So it is urgent
Need to solve the contradiction between efficient SCR denitration and sulfur trioxide problem.
Summary of the invention
For problem above, the purpose of the present invention is to propose to a kind of two-stage sulfur trioxide in flue gas removing means for gas cleaning and
Method, sprays into dry powder absorbent in SCR upstream in flue gas, utilizes SCR inlet flue space to enter the sulfur trioxide in flue gas
Row absorbs, and reduces SCR denitration reactor inlet sulfur trioxide concentration, sprays into two grades of absorbent in SCR denitration exhaust pass,
For remaining sulfur trioxide and the sulfur trioxide generated through SCR denitration oxidation are removed.Through secondary absorption
After, in flue gas, sulfur trioxide concentration significantly reduces, and on the one hand reduces ABS and generates, reduces afterbody equipment and the burn into of heat-transfer surface
Blocking risk, on the other hand reduces and discharges harmful components in air.This device gives full play to two grades and absorbs controlling SCR denitration
The motility of catalyst poisoning, reduces serious ammonium hydrogen sulfate blocking and etching problem that SCR degree of depth denitration causes, improves SCR
The safety of denitrating system upstream device.
For reaching above-mentioned purpose, the technical solution used in the present invention is:
A kind of two-stage sulfur trioxide in flue gas removing means for gas cleaning, is installed in a SCR denitration system, including:
It is arranged at an one-level absorber portion of a gas approach of SCR denitration system, including first order absorption agent injection apparatus；
It is arranged at one or two grades of absorber portions of an exhaust pass of SCR denitration system, including two grades of sorbent injection devices.
Further, the conventional structure in SCR denitration system is also included such as: inlet flue gas water conservancy diversion, ammonia-spraying grid, SCR denitration
Reactor, denitration outlet water conservancy diversion, heat exchanger etc..
Flue gas is before entering SCR denitration reactor, and the one-level first being carried out sulfur trioxide by first order absorption agent injection is removed,
After SCR denitration reactor, the sulfur trioxide utilizing two grades of sorbent injections to generate SCR denitration oxidation is carried out
Two grades of removings, reach the deep purifying of sulfur trioxide, and the flue gas after sulfur trioxide two-stage removes flows through heat exchanger and carries out waste heat
Reclaim, then discharged by exhaust pass.
Further, first order absorption agent is uniformly sprayed in gas approach by described first order absorption agent injection apparatus by multiple nozzles；
Two grades of absorbent are uniformly sprayed in exhaust pass by described two grades of sorbent injection devices by multiple nozzles.
Further, it is disposed with gas composition analysis detection device at gas approach and exhaust pass.
A kind of two-stage sulfur trioxide in flue gas removal methods for gas cleaning, comprises the following steps:
Before flue gas enters SCR denitration system, first pass around first order absorption section and in flue gas, spray into first order absorption agent, to flue gas
In sulfur trioxide carry out first order absorption；
At flue gas after SCR denitration system, in SCR denitration exhaust pass, in flue gas, spray into two grades of absorptions
Agent, carries out two grades of absorptions, the sulfur trioxide simultaneously remained in flue gas during first order absorption and SCR to the sulfur trioxide in flue gas
The sulfur trioxide that catalyst oxidation generates.
Further, first order absorption agent in first order absorption section and two grades of absorbent the time of staying (the i.e. flow process in two grades of absorber portions
Ratio with flow velocity) it is the 0.5-1 second.
Further, during first order absorption, first order absorption agent is less than 1 with the equivalent proportion of sulfur trioxide, reduces absorbent to SCR
The negative effect of denitrating catalyst.In two grades of absorption processes, the equivalent proportion of two grades of absorbent and sulfur trioxide is 1.5-2.5.
Further, first order absorption agent is powdered, particle size range 30-80 micron.Employing powdered absorbent can be true
Protect denitrating system equipment safety.
Further, the composition of described first order absorption agent is selected from calcium hydroxide, calcium oxide, one or more in magnesium oxide.
Further, two grades of absorbent are powdered or droplet solution.
Further, the composition of described two grades of absorbent is selected from calcium hydroxide, calcium oxide, sodium carbonate, the one in sodium bicarbonate
Or it is multiple.
Further, the flow field deviation in described gas approach and in exhaust pass is less than 5%.
After two-stage absorbs, the sulfur trioxide composition in flue gas significantly reduces, and decreases discharge of noxious gases in air,
Reduce the appearance of ABS problem in flue gas system simultaneously, reduce back-end surfaces and the blocking of afterbody equipment, the risk of corrosion.
Accompanying drawing explanation
Fig. 1 is the two-stage sulfur trioxide in flue gas removing means schematic diagram in one embodiment of the invention for purifying coal-fired flue gas.
Description of reference numerals: 1 first order absorption section；2 two grades of absorber portions；3 gas approach；4 first order absorption agent injection dresses
Put；5 inlet flue gas water conservancy diversion；6 ammonia-spraying grids；7 SCR denitration reactors；8 denitration outlet water conservancy diversion；9 two grades of absorptions
Agent injection apparatus；10 exhaust pass；11 heat exchangers；12 end outlet flues.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete retouching
State, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Based in the present invention
Embodiment, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, all
Belong to the scope of protection of the invention.Coordinate institute's accompanying drawing that the features and advantages of the present invention are elaborated below.
The two-stage sulfur trioxide in flue gas removing means for gas cleaning that the embodiment illustrated such as Fig. 1 is provided, is installed on a SCR
In denitrating system, including:
It is arranged at the first order absorption section 1 of the gas approach 3 of SCR denitration system, including first order absorption agent injection apparatus 4；
It is arranged at two grades of absorber portions 2 of the exhaust pass 10 of SCR denitration system, including two grades of sorbent injection devices 9.
Also include the conventional structure in SCR denitration system such as: inlet flue gas water conservancy diversion 5, ammonia-spraying grid 6, SCR denitration reactor 7,
Denitration outlet water conservancy diversion 8, heat exchanger 11 and end outlet flue 12 etc..
Flue gas, before entering SCR denitration reactor 7, first carries out the one of sulfur trioxide by first order absorption agent injection apparatus 4
Level removing, after SCR denitration reactor 7, utilizes two grades of sorbent injection devices 9 raw to SCR denitration oxidation
The sulfur trioxide become carries out two grades of removings, reaches the deep purifying of sulfur trioxide, the flue gas stream after sulfur trioxide two-stage removes
Carry out waste heat recovery through heat exchanger 11, then discharged by end outlet flue 12.
Specifically, first order absorption agent is uniformly sprayed in gas approach 3 by first order absorption agent injection apparatus 4 by multiple nozzles；Two
Two grades of absorbent are uniformly sprayed in exhaust pass 10 by level sorbent injection device 9 by multiple nozzles.
For the ease of monitoring sulfur trioxide removal effect, can be at gas approach 3, exhaust pass 10 and end outlet flue 12 cloth
Put gas composition analysis detection device (not shown).
The two-stage sulfur trioxide in flue gas removal methods for gas cleaning based on said apparatus, it is achieved process comprises the following steps:
Before flue gas enters SCR denitration system, first pass around first order absorption section and in flue gas, spray into first order absorption agent, to flue gas
In sulfur trioxide carry out first order absorption；
At flue gas after SCR denitration system, in SCR denitration exhaust pass, in flue gas, spray into two grades of absorptions
Agent, carries out two grades of absorptions, the sulfur trioxide simultaneously remained in flue gas during first order absorption and SCR to the sulfur trioxide in flue gas
The sulfur trioxide that catalyst oxidation generates.
Wherein, first order absorption agent in first order absorption section and two grades of absorbent the time of staying (i.e. flow process and the stream in two grades of absorber portions
The ratio of speed) it is the 0.5-1 second.
During first order absorption, first order absorption agent is less than 1 with the equivalent proportion of sulfur trioxide, reduces absorbent and is catalyzed SCR denitration
The negative effect of agent.In two grades of absorption processes, the equivalent proportion of two grades of absorbent and sulfur trioxide is 1.5-2.5.
First order absorption agent is powdered, particle size range 30-80 micron.Powdered absorbent is used to may insure that denitrating system
Equipment safety.
The composition of first order absorption agent is selected from calcium hydroxide, calcium oxide, one or more in magnesium oxide.
Two grades of absorbent are powdered or droplet solution.When using two grades of absorbent of powdered, 20-80 is micro-for its particle size range
Rice.
The composition of two grades of absorbent is selected from calcium hydroxide, calcium oxide, sodium carbonate, one or more in sodium bicarbonate.
By the flow field deviation in installing flow-guiding structure, gas approach and in exhaust pass less than 5%.
Two-stage sulfur trioxide in flue gas removing means for gas cleaning of the present invention, for China's up-to-date coal-fired flue-gas pollutant
Emission control requirement, considers the cigarette that high denitration efficiency strengthens and ammonium hydrogen sulfate causes that SCR denitration system faces with the escaping of ammonia
The corrosion of gas upstream device and blocking risk, and SCR denitration poisoning risk.First enter in SCR denitration upstream
Row sulfur trioxide one-level removing, in SCR denitration system gas approach, spray into powdered absorbent, by control absorbent and
Sulfur trioxide equivalent proportion, reduces the risk that SCR denitration is poisoned by absorbent.At flue gas after SCR denitration,
In SCR denitration reactor outlet flue, arrange two grades of absorption systems, in flue, spray into dry powder or stripping liquid, to flue gas
The sulfur trioxide that the sulfur trioxide of middle residual and SCR denitration oxidation generate absorbs.After two grades absorb, cigarette
In gas, sulfur trioxide composition is remarkably decreased, and back-end surfaces and the corrosion of equipment and blocking risk are also obviously improved simultaneously.
The present invention is for improving system operation reliability, and sorbent injection spray gun uses antifriction metal (AFM) material.For ensureing first order absorption section
Having higher efficiency with two grades of absorber portions, absorbent spout is arranged and is used multiinjector grid type arrangement, improves absorbent spray
The uniformity penetrated.The present invention can configure smoke components and measure system and jet control system according to system needs, improve system
The gentle scope of application of Automated water.
The present invention is directed in China's up-to-date environmental protection standard of coal-fired flue-gas Air Pollutant Emission and coal-fired flue-gas sulfur oxide to flue gas
Purify and the harm of heat exchange facilities.
Claims (10)
1. the two-stage sulfur trioxide in flue gas removing means for gas cleaning, it is characterised in that be installed on a SCR denitration system
In, including:
It is arranged at an one-level absorber portion of a gas approach of SCR denitration system, including first order absorption agent injection apparatus；
It is arranged at one or two grades of absorber portions of an exhaust pass of SCR denitration system, including two grades of sorbent injection devices.
2. the two-stage sulfur trioxide in flue gas removing means for gas cleaning as claimed in claim 1, it is characterised in that also include:
One inlet flue gas water conservancy diversion, an ammonia-spraying grid, a SCR denitration reactor, denitration outlet water conservancy diversion and a heat exchanger.
3. the two-stage sulfur trioxide in flue gas removing means for gas cleaning as claimed in claim 1, it is characterised in that described
First order absorption agent is uniformly sprayed in gas approach by level sorbent injection device by multiple nozzles；Described two grades of sorbent injections dress
Put and by multiple nozzles, two grades of absorbent are uniformly sprayed in exhaust pass.
4. the two-stage sulfur trioxide in flue gas removing means for gas cleaning as claimed in claim 1, it is characterised in that at entrance
Flue and exhaust pass are disposed with gas composition analysis detection device.
5., for a two-stage sulfur trioxide in flue gas removal methods for gas cleaning, comprise the following steps:
Before flue gas enters SCR denitration system, first pass around first order absorption section and in flue gas, spray into first order absorption agent, to flue gas
In sulfur trioxide carry out first order absorption；
At flue gas after SCR denitration system, in an exhaust pass, in flue gas, spray into two grades of absorbent, in flue gas
Sulfur trioxide carry out two grades of absorptions, absorb sulfur trioxide and the SCR catalyst oxygen of residual in flue gas during first order absorption simultaneously
The sulfur trioxide that metaplasia becomes.
6. the two-stage sulfur trioxide in flue gas removal methods for gas cleaning as claimed in claim 5, it is characterised in that one-level is inhaled
The time of staying in two grades of absorber portions is the 0.5-1 second in first order absorption section and two grades of absorbent to receive agent.
7. the two-stage sulfur trioxide in flue gas removal methods for gas cleaning as claimed in claim 5, it is characterised in that one-level is inhaled
During receipts, first order absorption agent is less than 1 with the equivalent proportion of sulfur trioxide, in two grades of absorption processes, and two grades of absorbent and three oxidations
The equivalent proportion of sulfur is 1.5-2.5.
8. the two-stage sulfur trioxide in flue gas removal methods for gas cleaning as claimed in claim 5, it is characterised in that one-level is inhaled
Receipts agent is powdered, particle size range 30-80 micron.
9. the two-stage sulfur trioxide in flue gas removal methods for gas cleaning as claimed in claim 5, it is characterised in that two grades of suctions
Receiving agent is powdered or droplet solution.
10. the two-stage sulfur trioxide in flue gas removal methods for gas cleaning as claimed in claim 5, it is characterised in that described
The composition of level absorbent is selected from calcium hydroxide, calcium oxide, one or more in magnesium oxide；The one-tenth sorting of described two grades of absorbent
From calcium hydroxide, calcium oxide, sodium carbonate, one or more in sodium bicarbonate.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106334441A (en) * | 2016-10-12 | 2017-01-18 | 浙江大学 | Cascade and deep coal-fired flue gas SO<3> removal system and method |
| CN106492603A (en) * | 2016-11-21 | 2017-03-15 | 西安交通大学 | A kind of device for removing sulfur trioxide before air preheater |
| CN106582286A (en) * | 2017-01-23 | 2017-04-26 | 福建龙净脱硫脱硝工程有限公司 | Flue gas purifying device and method |
| CN106823788A (en) * | 2017-03-06 | 2017-06-13 | 北京清新环境技术股份有限公司 | A kind of device and method for removing sulfur trioxide |
| CN106861375A (en) * | 2017-04-25 | 2017-06-20 | 广州冉升环保工程有限公司 | The device and method that a kind of sulfur trioxide in flue gas is administered |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106823788A (en) * | 2017-03-06 | 2017-06-13 | 北京清新环境技术股份有限公司 | A kind of device and method for removing sulfur trioxide |
| CN106823788B (en) * | 2017-03-06 | 2024-01-16 | 北京清新环境技术股份有限公司 | Device and method for removing sulfur trioxide |
| CN107051173A (en) * | 2017-03-21 | 2017-08-18 | 华电电力科学研究院 | One kind utilizes SO in carbide slag removing boiler smoke3Structure and method |
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| CN107952342A (en) * | 2017-11-14 | 2018-04-24 | 成都易态科技有限公司 | Flue gas during smelting purification technique |
| CN108187463A (en) * | 2018-02-24 | 2018-06-22 | 厦门锐传科技有限公司 | The governing system and its administering method of FCC flue gases |
| CN110339686A (en) * | 2018-04-03 | 2019-10-18 | 中国电力工程顾问集团华北电力设计院有限公司 | By removing SO3It realizes full load denitration and improves the method and device of boiler efficiency |
| CN108905594A (en) * | 2018-09-14 | 2018-11-30 | 东北大学 | A kind of method of sulfur trioxide concentration in inhibition smelting lead |
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