CN105233656A - Process used for removing sulfur trioxide in flue gas of coal-fired power plant - Google Patents
Process used for removing sulfur trioxide in flue gas of coal-fired power plant Download PDFInfo
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- CN105233656A CN105233656A CN201510730821.5A CN201510730821A CN105233656A CN 105233656 A CN105233656 A CN 105233656A CN 201510730821 A CN201510730821 A CN 201510730821A CN 105233656 A CN105233656 A CN 105233656A
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- flue gas
- sulfur trioxide
- absorbent
- coal
- absorbent solution
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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
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Abstract
The invention discloses a process used for removing sulfur trioxide in flue gas of a coal-fired power plant. According to concentration of sulfur trioxide in the flue gas in a flue, absorbent particles and demineralized water are introduced into a dissolving tank to prepare an absorbent solution; and under action of compressed air, the prepared absorbent solution is atomized sprayed into the flue through an injection unit to generate a chemical reaction with sulfur trioxide in the flue gas, so that the sulfur trioxide in the flue gas is removed. The process can guarantee that the absorbent solution and the flue gas are sufficiently and uniformly mixed, so that dosage of the absorbent particles is effectively reduced, operation cost is reduced, concentration of the sulfur trioxide in the flue gas is reduced to the greatest extent, and new atmospheric pollution and equipment problems are avoided while emissions of SO2, NOx and particular matters (PM) of the coal-fired power plant is reduced.
Description
Technical field
The present invention relates to atmosphere pollution and administer field, particularly a kind of technique for removing sulfur trioxide in coal-fired plant flue gas.
Background technology
At present, China's thermoelectricity installed capacity reaches 900,000,000 kilowatts, accounts for more than 60% of national generate output, and thermoelectricity remains the generating main force of China.Thermal power plant coal can produce NO in combustion
x, SO
2, SO
3deng pollutant, along with the increasingly stringent of national environmental standard, the pollutant that the concentration of emission in coal-fired plant flue gas is large, as NO
x, SO
2, flue dust etc. obtained effective control, but pollutants that in flue gas, some exist on a small quantity are as SO
3deng but being removed efficiently.
SO
3toxicity be about SO
210 times, be very easily combined with water and form H
2sO
4acid mist, this acid mist in an atmosphere diffusion can bring serious destruction to the respiratory tract of people, and also can form acid rain, damage capability is very big simultaneously.Because of SO in flue gas
3existence, can improve on the one hand the acid dew point of flue gas, condense in walling of flue and causing boiler flue corrosion, need improve boiler emission temperature for avoiding sour gas, cause boiler exhaust gas loss to increase, boiler efficiency declines; On the other hand, when flue gas is by wet-type absorption tower, flue-gas temperature reduces rapidly, SO in flue gas
3be combined with water and form H
2sO
4mist droplet, and absorption tower is to H
2sO
4droplet to remove ability low, phenomenon that chimney breast often occurs " Lan Yu ".
Along with popularizing of coal-burning power plant's SCR denitration system, under the effect of denitrating catalyst, about there is the SO of 0.4% ~ 1.6%
2be converted into SO
3, add SO in flue gas
3concentration.SO
3with steam, NH
3reaction generates NH
4hSO
4and H
2sO
4be deposited on hydrogen-catalyst reactor and the air preheater surfaces of SCR denitration system, cause catalyst failure and air preheater blocking, thus make coal unit occur that underload compels series of problems such as moving back, air preheater burn into catalyst life is short after installation SCR denitration device, have a strong impact on coal-burning power plant's denitration efficiency and unit normally runs.
The patent No. be 201310044506.8 Chinese patent disclose one and utilize trona effectively to remove flue gas SO
3device and technique, but absorbent consumption is high, trona and SO
3mol ratio up to 9:1, to SO
3removal efficiency only have 87%, cost is higher, and extrusion rate is lower, and removal effect is poor.
Therefore, urgent need exploitation is a kind of can ensure full and uniform the mixing of absorbent and flue gas, effectively reduces the consumption of absorbent, reduces operating cost, at utmost to reduce the concentration of sulfur trioxide in flue gas, realizes at minimizing coal-burning power plant SO
2, NO
xthe technique for removing sulfur trioxide in coal-fired plant flue gas of new atmosphere pollution and plant issue is not produced while discharging with particle (PM).
Summary of the invention
In view of this, the object of the present invention is to provide a kind of technique for removing sulfur trioxide in coal-fired plant flue gas, full and uniform the mixing of absorbent solution and flue gas can be ensured, effectively reduce the consumption of absorbent granules, reduce operating cost, at utmost to reduce the concentration of sulfur trioxide in flue gas, realize at minimizing coal-burning power plant SO
2, NO
xnew atmosphere pollution and plant issue is not produced while discharging with particle (PM).
Technique for removing sulfur trioxide in coal-fired plant flue gas of the present invention, comprises the following steps:
A. absorbent granules and the demineralized water for solution absorption agent particle is prepared;
B. according to the concentration of sulfur trioxide in the flue gas in flue, absorbent granules and demineralized water are passed into dissolve in case and is mixed with absorbent solution, wherein the mol ratio of absorbent granules and sulfur trioxide is 1.5 ~ 3, and in absorbent solution, the mass concentration of absorbent granules is 10% ~ 30%;
C. by the absorbent solution prepared in step b under compressed-air actuated effect, through injection unit to the atomization injection of flue, the sulfur trioxide generation chemical reaction with flue gas, removes the sulfur trioxide in flue gas.
Further, described absorbent granules is the one in sodium carbonate, sodium hydrogensulfite, sodium acid carbonate, calcium oxide.
Further, described absorbent granules is sodium carbonate or sodium hydrogensulfite.
Further, described absorbent granules and demineralized water are stored in absorbent storage bin and demineralized water storage bin respectively, and described absorbent storage bin is communicated with dissolving case respectively by transfer pipeline with demineralized water storage bin.
Further, be provided with heating and heat-insulating device in described dissolving case, the operating temperature of this heating and heat-insulating device is 30 DEG C ~ 50 DEG C.
Further, described absorbent solution is 150% ~ 200% by injection unit to the coverage rate of the atomization injection of flue.
Further, the eject position of described injection unit is SCR denitration system gas approach or SCR denitration system exhaust pass or air preheater exhaust pass or wet desulphurization absorption tower gas approach.
Further, described injection unit is the blender for carrying out atomized spray to absorbent solution, the entrance point of described blender is provided with for passing into absorbent solution and compressed air and the atomizer be atomized absorbent solution, the port of export of blender is connected with injection grid by pipeline, and the absorbent solution after blender is atomization is sprayed in flue by spraying grid under compressed-air actuated effect.
Further, described injection unit for for passing into absorbent solution and compressed-air actuated spray gun, enter absorbent solution in spray gun under compressed-air actuated effect by the pressure atomized fog jet of spray gun rifle head to the atomization injection of flue.
Further, when the eject position of described spray gun is SCR denitration system gas approach, this spray gun is provided with the cooling-air protection system for preventing absorbent solution from solidifying before not spraying.
Beneficial effect of the present invention: the technique for removing sulfur trioxide in coal-fired plant flue gas of the present invention, absorbent granules is mixed with certain density absorbent solution by demineralized water, absorbent solution is under compressed-air actuated effect, through injection unit to the atomization injection of flue, the sulfur trioxide in flue gas is removed.This technique can ensure full and uniform the mixing of absorbent solution and flue gas, effectively reduce the consumption of absorbent granules, reduce operating cost, at utmost to reduce the concentration of sulfur trioxide in flue gas, the removal efficiency testing sulfur trioxide through applicant can reach 90% ~ 99%, realizes at minimizing coal-burning power plant SO
2, NO
xnew atmosphere pollution and plant issue is not produced while discharging with particle (PM).
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described:
Fig. 1 is process chart of the present invention;
Fig. 2 is a kind of embodiment of injection unit of the present invention;
Fig. 3 is the another kind of embodiment of injection unit of the present invention;
Fig. 4 is another embodiment of injection unit of the present invention.
Detailed description of the invention
Fig. 1 is process chart of the present invention, Fig. 2 is a kind of embodiment of injection unit of the present invention, Fig. 3 is the another kind of embodiment of injection unit of the present invention, Fig. 4 is another embodiment of injection unit of the present invention, as shown in the figure: the technique for removing sulfur trioxide in coal-fired plant flue gas of the present embodiment, comprises the following steps:
A. absorbent granules and the demineralized water for solution absorption agent particle is prepared;
B. according to the concentration of sulfur trioxide in the flue gas in flue, absorbent granules and demineralized water are passed into dissolve in case 3 and is mixed with absorbent solution, wherein the mol ratio of absorbent granules and sulfur trioxide is 1.5 ~ 3, and in absorbent solution, the mass concentration of absorbent granules is 10% ~ 30%;
C. by the absorbent solution prepared in step b under the effect of compressed air 4, through injection unit to the atomization injection of flue 5, with the sulfur trioxide generation chemical reaction in flue gas, sulfur trioxide in flue gas is removed, this technique is enable to ensure full and uniform the mixing of absorbent solution and flue gas, effectively reduce the consumption of absorbent granules, reduce operating cost, and the removal efficiency of sulfur trioxide can reach 90% ~ 99%.
In the present embodiment, described absorbent granules is the one in sodium carbonate, sodium hydrogensulfite, sodium acid carbonate, calcium oxide.
In the present embodiment, described absorbent granules is sodium carbonate or sodium hydrogensulfite, absorbent granules preferentially selects sodium carbonate or sodium hydrogensulfite, absorbent granules particle diameter≤the 20mm of the present embodiment, if absorbent granules particle diameter > is 20mm, then need configuration absorbent grinding system, to ensure that absorbent granules is even, improve the dissolution velocity of absorbent granules.
In the present embodiment, described absorbent granules and demineralized water are stored in absorbent storage bin 1 and demineralized water storage bin 2 respectively, described absorbent storage bin 1 is communicated with dissolving case 3 respectively by transfer pipeline with demineralized water storage bin 2, by arranging absorbent storage bin 1 and demineralized water storage bin 2, so that the storage of absorbent granules and demineralized water and supply.
In the present embodiment, be provided with heating and heat-insulating device in described dissolving case 3, the operating temperature of this heating and heat-insulating device is 30 DEG C ~ 50 DEG C, and the temperature for controlling absorbent solution remains on 30 DEG C ~ 50 DEG C, ensure the amount of solute in absorbent solution, prevent Yin Wendu from reducing and causing the problems such as crystallization.
In the present embodiment, described absorbent solution is 150% ~ 200% by injection unit to the coverage rate of the atomization injection of flue 5, to ensure full and uniform the mixing of absorbent solution and flue gas to greatest extent, improves removal effect.
In the present embodiment, the eject position of described injection unit is SCR denitration system gas approach or SCR denitration system exhaust pass or air preheater exhaust pass or wet desulphurization absorption tower gas approach.
In the present embodiment, as shown in Figure 2, described injection unit can be the blender 6 for carrying out atomized spray to absorbent solution, the entrance point of described blender 6 is provided with for passing into absorbent solution and compressed air and the atomizer 7 be atomized absorbent solution, the port of export of blender 6 is connected with by pipeline and sprays grid 8, absorbent solution after blender 6 is atomization is sprayed by spraying grid 8, to realize removing sulfur trioxide in flue gas under compressed-air actuated effect in flue 5.
In the present embodiment, as shown in Figure 3, described injection unit also can be for passing into absorbent solution and compressed-air actuated spray gun 9, enter absorbent solution in spray gun 9 under compressed-air actuated effect by the pressure atomized fog jet 9a of spray gun 9 rifle head to the atomization injection of flue 5, to realize removing sulfur trioxide in flue gas.
In the present embodiment; as shown in Figure 4; when the eject position of described spray gun 9 is SCR denitration system gas approach; this spray gun 9 is provided with the cooling-air protection system 10 for preventing absorbent solution from solidifying before not spraying; cooling-air is passed into spray gun 9 by cooling-air protection system 10; to prevent absorbent solution from not spraying front solidification, ensure atomised jet effect.
What finally illustrate is, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (10)
1. for removing a technique for sulfur trioxide in coal-fired plant flue gas, it is characterized in that, comprising the following steps:
A. absorbent granules and the demineralized water for solution absorption agent particle is prepared;
B. according to the concentration of sulfur trioxide in the flue gas in flue, absorbent granules and demineralized water are passed into dissolve in case and is mixed with absorbent solution, wherein the mol ratio of absorbent granules and sulfur trioxide is 1.5 ~ 3, and in absorbent solution, the mass concentration of absorbent granules is 10% ~ 30%;
C. by the absorbent solution prepared in step b under compressed-air actuated effect, through injection unit to the atomization injection of flue, the sulfur trioxide generation chemical reaction with flue gas, removes the sulfur trioxide in flue gas.
2. the technique for removing sulfur trioxide in coal-fired plant flue gas according to claim 1, is characterized in that: described absorbent granules is the one in sodium carbonate, sodium hydrogensulfite, sodium acid carbonate, calcium oxide.
3. the technique for removing sulfur trioxide in coal-fired plant flue gas according to claim 2, is characterized in that: described absorbent granules is sodium carbonate or sodium hydrogensulfite.
4. the technique for removing sulfur trioxide in coal-fired plant flue gas according to claim 1, it is characterized in that: described absorbent granules and demineralized water are stored in absorbent storage bin and demineralized water storage bin respectively, described absorbent storage bin is communicated with dissolving case respectively by transfer pipeline with demineralized water storage bin.
5. the technique for removing sulfur trioxide in coal-fired plant flue gas according to claim 4, is characterized in that: be provided with heating and heat-insulating device in described dissolving case, and the operating temperature of this heating and heat-insulating device is 30 DEG C ~ 50 DEG C.
6. the technique for removing sulfur trioxide in coal-fired plant flue gas according to claim 1, is characterized in that: described absorbent solution is 150% ~ 200% by injection unit to the coverage rate of the atomization injection of flue.
7. the technique for removing sulfur trioxide in coal-fired plant flue gas according to claim 6, is characterized in that: the eject position of described injection unit is SCR denitration system gas approach or SCR denitration system exhaust pass or air preheater exhaust pass or wet desulphurization absorption tower gas approach.
8. the technique for removing sulfur trioxide in coal-fired plant flue gas according to claim 7, it is characterized in that: described injection unit is the blender for carrying out atomized spray to absorbent solution, the entrance point of described blender is provided with for passing into absorbent solution and compressed air and the atomizer be atomized absorbent solution, the port of export of blender is connected with injection grid by pipeline, and the absorbent solution after blender is atomization is sprayed in flue by spraying grid under compressed-air actuated effect.
9. the technique for removing sulfur trioxide in coal-fired plant flue gas according to claim 7, it is characterized in that: described injection unit for for passing into absorbent solution and compressed-air actuated spray gun, enter absorbent solution in spray gun under compressed-air actuated effect by the pressure atomized fog jet of spray gun rifle head to the atomization injection of flue.
10. the technique for removing sulfur trioxide in coal-fired plant flue gas according to claim 9; it is characterized in that: when the eject position of described spray gun is SCR denitration system gas approach, this spray gun is provided with the cooling-air protection system for preventing absorbent solution from solidifying before not spraying.
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| CN201510730821.5A CN105233656A (en) | 2015-11-02 | 2015-11-02 | Process used for removing sulfur trioxide in flue gas of coal-fired power plant |
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| CN201510730821.5A CN105233656A (en) | 2015-11-02 | 2015-11-02 | Process used for removing sulfur trioxide in flue gas of coal-fired power plant |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105477995A (en) * | 2016-01-18 | 2016-04-13 | 北京清新环境技术股份有限公司 | Method for removing sulfur trioxide from coal-fired flue gas |
| CN105854557A (en) * | 2016-04-21 | 2016-08-17 | 上海迪夫格环境科技有限公司 | Method and device for evenly spraying alkali liquor to remove sulfur trioxide in exhaust gas |
| CN105854565A (en) * | 2016-06-01 | 2016-08-17 | 中电投远达环保工程有限公司 | Combined removal method for SO3 and Hg in flue gas of coal-fired power plant |
| CN105879641A (en) * | 2016-06-02 | 2016-08-24 | 北京国电龙源环保工程有限公司 | Device and method for removing sulfur trioxide through alkali liquor jet atomization |
| CN106039967A (en) * | 2016-07-19 | 2016-10-26 | 中国华电科工集团有限公司 | Device and method for removing SO3 in flue gas of coal-fired unit |
| CN106090967A (en) * | 2016-05-30 | 2016-11-09 | 杨天宇 | A kind of boiler energy-saving environment protection method and device |
| CN106178904A (en) * | 2016-09-09 | 2016-12-07 | 成都九十度工业产品设计有限公司 | A kind of emission-control equipment and waste gas processing method |
| CN106955565A (en) * | 2017-03-20 | 2017-07-18 | 中信戴卡股份有限公司 | A kind of device for being used to handle salt fog machine waste gas |
| CN111167293A (en) * | 2020-01-07 | 2020-05-19 | 无锡市华星电力环保修造有限公司 | Method and equipment for FWGD cooperative fine particulate matter and SO3 removal |
| CN111318142A (en) * | 2020-02-20 | 2020-06-23 | 中国神华能源股份有限公司国华电力分公司 | Sulfur trioxide removing device for coal combustion system |
| CN111905542A (en) * | 2020-08-26 | 2020-11-10 | 西安热工研究院有限公司 | Pre-oxidation and wet catalysis combined desulfurization and denitrification system and method |
| CN113457405A (en) * | 2021-08-06 | 2021-10-01 | 润电能源科学技术有限公司 | Device and method for cooperatively removing sulfur trioxide and hydrogen chloride in coal-fired flue gas |
| CN113813779A (en) * | 2021-09-03 | 2021-12-21 | 国家电投集团远达环保工程有限公司重庆科技分公司 | Sulfur trioxide removal equipment and method for flue gas purification facility comprising SCR denitration system |
| CN114522531A (en) * | 2022-02-23 | 2022-05-24 | 河北华硕化工助剂有限公司 | Efficient composite desulfurization and denitrification absorbent |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105477995B (en) * | 2016-01-18 | 2019-03-19 | 北京清新环境技术股份有限公司 | A kind of method of sulfur trioxide in removing coal-fired flue-gas |
| CN105477995A (en) * | 2016-01-18 | 2016-04-13 | 北京清新环境技术股份有限公司 | Method for removing sulfur trioxide from coal-fired flue gas |
| CN105854557A (en) * | 2016-04-21 | 2016-08-17 | 上海迪夫格环境科技有限公司 | Method and device for evenly spraying alkali liquor to remove sulfur trioxide in exhaust gas |
| CN106090967A (en) * | 2016-05-30 | 2016-11-09 | 杨天宇 | A kind of boiler energy-saving environment protection method and device |
| CN105854565A (en) * | 2016-06-01 | 2016-08-17 | 中电投远达环保工程有限公司 | Combined removal method for SO3 and Hg in flue gas of coal-fired power plant |
| CN105879641A (en) * | 2016-06-02 | 2016-08-24 | 北京国电龙源环保工程有限公司 | Device and method for removing sulfur trioxide through alkali liquor jet atomization |
| CN106039967A (en) * | 2016-07-19 | 2016-10-26 | 中国华电科工集团有限公司 | Device and method for removing SO3 in flue gas of coal-fired unit |
| CN106178904A (en) * | 2016-09-09 | 2016-12-07 | 成都九十度工业产品设计有限公司 | A kind of emission-control equipment and waste gas processing method |
| CN106955565A (en) * | 2017-03-20 | 2017-07-18 | 中信戴卡股份有限公司 | A kind of device for being used to handle salt fog machine waste gas |
| CN111167293A (en) * | 2020-01-07 | 2020-05-19 | 无锡市华星电力环保修造有限公司 | Method and equipment for FWGD cooperative fine particulate matter and SO3 removal |
| CN111318142A (en) * | 2020-02-20 | 2020-06-23 | 中国神华能源股份有限公司国华电力分公司 | Sulfur trioxide removing device for coal combustion system |
| CN111905542A (en) * | 2020-08-26 | 2020-11-10 | 西安热工研究院有限公司 | Pre-oxidation and wet catalysis combined desulfurization and denitrification system and method |
| CN113457405A (en) * | 2021-08-06 | 2021-10-01 | 润电能源科学技术有限公司 | Device and method for cooperatively removing sulfur trioxide and hydrogen chloride in coal-fired flue gas |
| CN113813779A (en) * | 2021-09-03 | 2021-12-21 | 国家电投集团远达环保工程有限公司重庆科技分公司 | Sulfur trioxide removal equipment and method for flue gas purification facility comprising SCR denitration system |
| CN114522531A (en) * | 2022-02-23 | 2022-05-24 | 河北华硕化工助剂有限公司 | Efficient composite desulfurization and denitrification absorbent |
| CN114522531B (en) * | 2022-02-23 | 2023-10-13 | 河北华硕化工助剂有限公司 | High-efficiency composite desulfurization and denitrification absorbent |
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Application publication date: 20160113 |
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| RJ01 | Rejection of invention patent application after publication |