CN105879620B - A kind of two-stage sulfur trioxide in flue gas removing means and method for gas cleaning - Google Patents
A kind of two-stage sulfur trioxide in flue gas removing means and method for gas cleaning Download PDFInfo
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- CN105879620B CN105879620B CN201610313045.3A CN201610313045A CN105879620B CN 105879620 B CN105879620 B CN 105879620B CN 201610313045 A CN201610313045 A CN 201610313045A CN 105879620 B CN105879620 B CN 105879620B
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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 present invention proposes a kind of two-stage sulfur trioxide in flue gas removing means for gas cleaning, is installed in a SCR denitration system, comprising: is set to a level-one absorber portion of a gas approach of SCR denitration system, including first order absorption agent injection apparatus；It is set to a second level absorber portion of an exhaust pass of SCR denitration system, including second level sorbent injection device.First order absorption agent is sprayed into flue gas in the upstream SCR, sulfur trioxide in flue gas is absorbed, reduce SCR denitration reaction device entrance sulfur trioxide concentration, second level absorbent is sprayed into SCR denitration exhaust pass, is removed to remaining sulfur trioxide and by the sulfur trioxide that SCR denitration oxidation generates.On the one hand it reduces ABS to generate, the burn into for reducing tail portion equipment and heat-transfer surface blocks risk, on the other hand reduces and discharges harmful components into atmosphere.The two-stage sulfur trioxide in flue gas removal methods for gas cleaning based on the device are provided simultaneously.
Description
Technical field
The present invention relates to environmental technology field, in particular to a kind of sulfur trioxide for coal-fired flue-gas deep purifying removes
A kind of device, and in particular to two-stage sulfur trioxide in flue gas removing means and method for gas cleaning.
Background technique
Currently, each department Air Pollutant Emission is already required to entirely according to overall control, especially fossil-fired unit
Face executes pollutant minimum discharge standard.The State Council of the PRC's standing meeting is held on December 2nd, 2015 to determine entirely
Coal-burning power plant's minimum discharge and reducing energy consumption are implemented in face, and coal consumption for power generation and disposal of pollutants is greatly reduced.Mean the coal-fired fire in China
The concentration of power plant emission nitrogen oxides in effluent will all be no more than 50mg/Nm3。
China's coal-fired flue gas denitration mainly takes SCR denitration technology, is presently the most common denitration technology, SCR denitration
Its principle of technology is by spraying into ammonia into flue gas as reducing agent, under the action of denitrating catalyst, by the nitrogen in flue gas
Oxide is reduced to N2.Into certain density sulfur trioxide is usually contained in the flue gas of SCR denitration system, it is de- to will lead to SCR
There is sour gas poisoning in denox catalyst.The sulfur trioxide as contained in the flue gas for entering SCR denitration reaction device will lead to SCR
Denitrating catalyst poisoning influences denitrating flue gas efficiency, and cooperatively forms ABS with the ammonia of SCR denitration system escape, causes
Back-end surfaces corrosion and blocking, can be more heated to tail portion after flue-gas temperature is down to dew point when sulfur trioxide concentration is higher
Face forms sour corrosion, seriously affects power station equipment safety in operation and economy.
In addition, in order to reach higher denitration efficiency, realizing that the depth of nitrogen oxides is de- according to SCR denitration reaction characteristic
It removes, needs to spray into a greater amount of ammonias into flue gas, to promote the progress of reduction reaction.When penetrating ammonia amount is excessively high, it is easy
Denitrating system rear portion amount of ammonia slip is caused to increase considerably, since there are certain density sulfur trioxides in flue gas, and in flue gas
Sulfur dioxide had after SCR denitration part be oxidized to sulfur trioxide, further increase ABS generate wind
Danger.In the presence of ammonia, ammonium hydrogen sulfate can be generated, flue gas upstream device is caused serious corrosion and blocking occur.Institute
With the contradiction between efficient SCR denitration in the urgent need to address and sulfur trioxide problem.
Summary of the invention
In view of the above problems, the purpose of the present invention is to propose to a kind of two-stage sulfur trioxide in flue gas removings for gas cleaning
Device and method sprays into dry powder absorbent into flue gas in the upstream SCR, using SCR inlet flue space to three oxygen in flue gas
Change sulphur to be absorbed, reduce SCR denitration reaction device entrance sulfur trioxide concentration, second level is sprayed into SCR denitration exhaust pass and is inhaled
Agent is received, for removing to remaining sulfur trioxide and by the sulfur trioxide that SCR denitration oxidation generates.By two
After grade absorption, sulfur trioxide concentration is significantly reduced in flue gas, is on the one hand reduced ABS and is generated, reduces tail portion equipment and heat-transfer surface
Burn into block risk, on the other hand reduce and discharge harmful components into atmosphere.The present apparatus gives full play to second level and absorbs to control
The flexibility of SCR denitration poisoning reduces serious ammonium hydrogen sulfate blocking and corrosion caused by SCR depth denitration and asks
Topic improves the safety of SCR denitration system upstream device.
In order to achieve the above object, the technical solution adopted by the present invention is that:
A kind of two-stage sulfur trioxide in flue gas removing means for gas cleaning, is installed in a SCR denitration system, packet
It includes:
It is set to a level-one absorber portion of a gas approach of SCR denitration system, including first order absorption agent injection apparatus；
It is set to a second level absorber portion of an exhaust pass of SCR denitration system, including second level sorbent injection device.
Further, further include conventional structure in SCR denitration system such as: inlet flue gas water conservancy diversion, ammonia-spraying grid, SCR are de-
Nitre reactor, denitration export water conservancy diversion, heat exchanger etc..
Flue gas carries out the level-one of sulfur trioxide by first order absorption agent injection before entering SCR denitration reaction device first
Removing, three oxidations after SCR denitration reaction device, using second level sorbent injection to SCR denitration oxidation generation
Sulphur carries out second level removing, reaches the deep purifying of sulfur trioxide, and the flue gas after the removing of sulfur trioxide two-stage flows through heat exchanger
Waste heat recycling is carried out, is then discharged by exhaust pass.
Further, first order absorption agent is uniformly sprayed into entrance cigarette by multiple nozzles by the first order absorption agent injection apparatus
In road；The second level sorbent injection device is uniformly sprayed into second level absorbent in exhaust pass by multiple nozzles.
Further, gas composition analysis detection device is disposed in gas approach and exhaust pass.
A kind of two-stage sulfur trioxide in flue gas removal methods for gas cleaning, comprising the following steps:
Before flue gas enters SCR denitration system, first passes around first order absorption section and spray into first order absorption agent into flue gas, it is right
Sulfur trioxide in flue gas carries out first order absorption；
In flue gas after SCR denitration system, in SCR denitration exhaust pass, second level is sprayed into flue gas
Absorbent carries out second level absorption to the sulfur trioxide in flue gas, while remaining sulfur trioxide in flue gas during first order absorption
And the sulfur trioxide that SCR catalyst oxidation generates.
Further, residence time of the first order absorption agent in first order absorption section and second level absorbent in second level absorber portion
(i.e. the ratio of process and flow velocity) is 0.5-1 seconds.
Further, during first order absorption, the equivalent proportion of first order absorption agent and sulfur trioxide reduces absorbent less than 1
Negative effect to SCR denitration.In second level absorption process, the equivalent proportion of second level absorbent and sulfur trioxide is 1.5-
2.5。
Further, first order absorption agent be dry powder-shaped, 30-80 microns of particle size range.It can using dry powder-shaped absorbent
To ensure denitrating system equipment safety.
Further, the ingredient of the first order absorption agent is selected from calcium hydroxide, calcium oxide, one of magnesia or more
Kind.
Further, second level absorbent is dry powder-shaped or droplet solution.
Further, the ingredient of the second level absorbent is selected from calcium hydroxide, calcium oxide, sodium carbonate, in sodium bicarbonate
It is one or more.
Further, the flow field deviation in the gas approach and in exhaust pass is less than 5%.
After two-stage absorbs, the sulfur trioxide ingredient in flue gas is significantly reduced, and is reduced and is discharged nocuousness into atmosphere
Gas, while reducing the appearance of ABS problem in flue gas system reduces back-end surfaces and the blocking of tail portion equipment, corrosion
Risk.
Detailed description of the invention
Fig. 1 is to illustrate in one embodiment of the invention for the two-stage sulfur trioxide in flue gas removing means of purifying coal-fired flue gas
Figure.
Description of symbols: 1-first order absorption section；2-second level absorber portions；3-gas approach；4-first order absorption agent spray
Injection device；5-inlet flue gas water conservancy diversion；6-ammonia-spraying grids；7-SCR denitration reaction devices；8-denitrations export water conservancy diversion；9-second levels are inhaled
Receive agent injection apparatus；10-exhaust pass；11-heat exchangers；12-end outlet flues.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Whole description, it is clear that the described embodiment is only a part of the embodiment of the present invention, instead of all the embodiments.Based on this
Embodiment in invention, every other reality obtained by those of ordinary skill in the art without making creative efforts
Example is applied, shall fall within the protection scope of the present invention.Cooperation institute's attached drawing elaborates to the features and advantages of the present invention below.
The two-stage sulfur trioxide in flue gas removing means of gas cleaning, installation are used for provided by the embodiment being painted such as Fig. 1
In a SCR denitration system, comprising:
It is set to 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 set to the second level absorber portion 2 of the exhaust pass 10 of SCR denitration system, including second level sorbent injection device 9.
Further include conventional structure in SCR denitration system such as: inlet flue gas water conservancy diversion 5, ammonia-spraying grid 6, SCR denitration reaction device
7, denitration exports water conservancy diversion 8, heat exchanger 11 and end outlet flue 12 etc..
Flue gas carries out sulfur trioxide by first order absorption agent injection apparatus 4 before entering SCR denitration reaction device 7 first
Level-one removing, after SCR denitration reaction device 7, using second level sorbent injection device 9 to SCR denitration aoxidize
The sulfur trioxide of generation carries out second level removing, reaches the deep purifying of sulfur trioxide, the cigarette after the removing of sulfur trioxide two-stage
Air-flow carries out waste heat recycling through heat exchanger 11, is then discharged by end outlet flue 12.
Specifically, first order absorption agent is uniformly sprayed into gas approach 3 by multiple nozzles by first order absorption agent injection apparatus 4
It is interior；Second level sorbent injection device 9 is uniformly sprayed into second level absorbent in exhaust pass 10 by multiple nozzles.
It, can be in gas approach 3, exhaust pass 10 and end outlet flue 12 for the ease of monitoring sulfur trioxide removal effect
Arrange gas composition analysis detection device (not shown).
The two-stage sulfur trioxide in flue gas removal methods for gas cleaning based on above-mentioned apparatus, realization process includes following
Step:
Before flue gas enters SCR denitration system, first passes around first order absorption section and spray into first order absorption agent into flue gas, it is right
Sulfur trioxide in flue gas carries out first order absorption；
In flue gas after SCR denitration system, in SCR denitration exhaust pass, second level is sprayed into flue gas
Absorbent carries out second level absorption to the sulfur trioxide in flue gas, while remaining sulfur trioxide in flue gas during first order absorption
And the sulfur trioxide that SCR catalyst oxidation generates.
Wherein, first order absorption agent (is flowed in the residence time of first order absorption section and second level absorbent in second level absorber portion
The ratio of journey and flow velocity) it is 0.5-1 seconds.
During first order absorption, the equivalent proportion of first order absorption agent and sulfur trioxide reduces absorbent to SCR denitration less than 1
The negative effect of catalyst.In second level absorption process, the equivalent proportion of second level absorbent and sulfur trioxide is 1.5-2.5.
First order absorption agent be dry powder-shaped, 30-80 microns of particle size range.Denitration may insure using dry powder-shaped absorbent
System equipment safety.
The ingredient of first order absorption agent is selected from calcium hydroxide, calcium oxide, one of magnesia or a variety of.
Second level absorbent is dry powder-shaped or droplet solution.When using dry powder-shaped second level absorbent, particle size range 20-
80 microns.
The ingredient of second level absorbent is selected from calcium hydroxide, calcium oxide, sodium carbonate, one of sodium bicarbonate or a variety of.
By installing flow-guiding structure, the flow field deviation in gas approach and in exhaust pass is less than 5%.
Two-stage sulfur trioxide in flue gas removing means of the present invention for gas cleaning, for the newest coal-fired flue-gas in China
Pollutant emission control requires, and comprehensively considers high denitration efficiency and the escaping of ammonia increases and ammonium hydrogen sulfate that SCR denitration system faces
Caused flue gas upstream device corrosion and blocking risk and SCR denitration poisoning risk.It is catalyzed first in SCR denitration
Agent upstream carries out the level-one removing of sulfur trioxide, and dry powder-shaped absorbent is sprayed into SCR denitration system gas approach, passes through control
Absorbent and sulfur trioxide equivalent proportion reduce the risk that absorbent is poisoned to SCR denitration.Pass through SCR denitration in flue gas
After, it in SCR denitration reaction device exhaust pass, arranges second level absorption system, dry powder or stripping liquid is sprayed into flue,
The sulfur trioxide generated to sulfur trioxide remaining in flue gas and SCR denitration oxidation absorbs.It is absorbed by second level
After, sulfur trioxide ingredient is remarkably decreased in flue gas, while back-end surfaces and equipment corrosion and blocking risk also obviously change
It is kind.
The present invention is to improve system operation reliability, and sorbent injection spray gun uses antifriction metal (AFM) material.To guarantee level-one
Absorber portion and second level absorber portion efficiency with higher, absorbent spout arrangement use multiinjector grid type arrangement, improve
The uniformity of sorbent injection.The present invention can configure smoke components measuring system and jet control system according to system needs,
Improve system automation level and the scope of application.
Oxidation of the present invention for sulphur in the newest environmental protection standard of China's coal-fired flue-gas Air Pollutant Emission and coal-fired flue-gas
Harm of the object to gas cleaning and heat exchange facilities.
Claims (5)
1. a kind of two-stage sulfur trioxide in flue gas removal methods for gas cleaning, comprising the following steps:
Before flue gas enters SCR denitration system, the first order absorption section being set in a gas approach is first passed around into flue gas
First order absorption agent is sprayed into, first order absorption is carried out to the sulfur trioxide in flue gas；
In flue gas after SCR denitration system, in an exhaust pass, second level absorbent is sprayed into flue gas, in flue gas
Sulfur trioxide carry out second level absorption, while absorbing during first order absorption remaining sulfur trioxide and SCR catalyst in flue gas
Aoxidize the sulfur trioxide generated；
During first order absorption, the equivalent proportion of first order absorption agent and sulfur trioxide is less than 1, and in second level absorption process, second level absorbs
The equivalent proportion of agent and sulfur trioxide is 1.5-2.5；
Flow field deviation in gas approach and in exhaust pass is less than 5%.
2. being used for the two-stage sulfur trioxide in flue gas removal methods of gas cleaning as described in claim 1, which is characterized in that level-one
Absorbent is 0.5-1 seconds in the residence time of first order absorption section and second level absorbent in second level absorber portion.
3. being used for the two-stage sulfur trioxide in flue gas removal methods of gas cleaning as described in claim 1, which is characterized in that level-one
Absorbent is dry powder-shaped, 30-80 microns of particle size range.
4. being used for the two-stage sulfur trioxide in flue gas removal methods of gas cleaning as described in claim 1, which is characterized in that second level
Absorbent is dry powder-shaped or droplet solution.
5. being used for the two-stage sulfur trioxide in flue gas removal methods of gas cleaning as described in claim 1, which is characterized in that described
The ingredient of first order absorption agent is selected from calcium hydroxide, calcium oxide, one of magnesia or a variety of；The ingredient of the second level absorbent
Selected from calcium hydroxide, calcium oxide, sodium carbonate, one of sodium bicarbonate or a variety of.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN106492603B (en) * | 2016-11-21 | 2019-03-01 | 西安交通大学 | It is a kind of for removing the device of sulfur trioxide before air preheater |
| US10661225B2 (en) * | 2016-12-07 | 2020-05-26 | Solvay Sa | Copper supported catalyst comprising a Ca-deficient hydroxyapatite for waste gas NOx removal |
| CN106582286B (en) * | 2017-01-23 | 2022-12-13 | 福建龙净脱硫脱硝工程有限公司 | Flue gas purification device and method |
| 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 |
| 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 |
| CN113842771A (en) * | 2017-11-14 | 2021-12-28 | 成都易态科技有限公司 | Smelting flue gas purification process |
| 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 |
| CN108905594B (en) * | 2018-09-14 | 2020-11-03 | 东北大学 | Method for inhibiting concentration of sulfur trioxide in lead smelting flue gas |
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| CA2193638C (en) * | 1995-06-28 | 2000-01-25 | Isao Mochida | Exhaust gas treating systems |
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| CN104190252A (en) * | 2014-08-20 | 2014-12-10 | 浙江大学 | Multistage pyrolysis coupled flue gas denitrification system with independent SCR (Selective Catalytic Reduction) ammonia-supplementing spray guns |
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