CN102489143A - Flue-gas desulphurization system and flue-gas desulphurization method - Google Patents
Flue-gas desulphurization system and flue-gas desulphurization method Download PDFInfo
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- CN102489143A CN102489143A CN2011104313571A CN201110431357A CN102489143A CN 102489143 A CN102489143 A CN 102489143A CN 2011104313571 A CN2011104313571 A CN 2011104313571A CN 201110431357 A CN201110431357 A CN 201110431357A CN 102489143 A CN102489143 A CN 102489143A
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- gypsum
- dewatering screen
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Abstract
The invention relates to a flue-gas desulphurization system and a flue-gas desulphurization method. The flue-gas desulphurization system comprises a desulphurization absorbing tower connected with a limestone slurry feeding pipe, a flue-gas pipeline, a cloth-bag dust remover, a two-stage mist remover, a blower, a slurry discharging pump I and a hydraulic cyclone connected with the slurry discharging pump I, and is characterized in that the hydraulic cyclone is also connected with a slurry discharging pump II and a filtering machine; and the slurry discharging pump II is also connected with a dewatering screen which is also respectively connected with the filtering machine and a gypsum stockpile. The flue-gas desulphurization method comprises the following steps that: flue gas is dissolved in limestone slurry and then oxidized and crystallized to form gypsum slurry; and the gypsum slurry is concentrated by the hydraulic cyclone, the underflow of the hydraulic cyclone is pumped into the dewatering screen for dewatering by the slurry discharging pump II, and the overflow of the hydraulic cyclone is fed into the filtering machine for filtering. According to the flue-gas desulphurization system and the flue-gas desulphurization method, since the filtering machine and the dewatering screen are additionally arranged behind the hydraulic cyclone of the flue-gas desulphurization system and the dewatering screen is adopted for dewatering, so that the problem of difficult dewatering of the gypsum is effectively solved and the additional value of a gypsum product is high.
Description
Technical field
The invention belongs to the flue gases purification field, especially relate to a kind of flue gas desulphurization system and fume desulphurization method.
Background technology
In order to prevent that the flue gas desulphurization from causing atmosphere pollution, need carry out flue gas desulfurization.At present, often adopt wet desulphurization and dry desulfurizing process.Its wet desulfurizing process: agstone gets into the slurrying pond through batcher at the bottom of the lime stone storehouse, is made into lime stone slurry, adds stock pump through lime stone again and delivers to desulfuration absorbing tower.Slurries are circulation up and down in the absorption tower; Flue gas gets into the absorption tower after the sack cleaner dedusting, the reverse absorbing contact of flue gas and slurries in the absorption tower, and the oxidation trough flue gas is dissolved in the lime stone slurry in the bottom, absorption tower; Be oxidized to calcium sulfite by air blast, crystallization generates gypsum.After the top flue gas after desulfurization is through the dehumidifying of two-stage demister, enter flue.Slurry pump is discharged gypsum slurries from the oxidation trough of absorption tower, after hydrocyclone concentrates, deliver to the dehydration of vacuum adhesive tape dewaterer, and dehydration back by-produced gypsum is stored in the gypsum storehouse.Because gypsum is more sticking, be not easy dehydration with vacuum adhesive tape dewaterer, be not easy to produce and satisfy the byproduct that dehydration requires, form secondary pollution easily.
Summary of the invention
The purpose of this invention is to provide effective flue gas desulphurization system of a kind of flue gas desulfurization and method, make the by-produced gypsum of flue gas desulfurization can satisfy the dehydration requirement, can not form secondary pollution.
The objective of the invention is to realize through following technical proposals:
Flue gas desulphurization system of the present invention; Comprise the desulfuration absorbing tower that is connected with the lime stone slurry feed pipe, the flue gas pipeline that is located at this desulphurization absorption tower system top; The sack cleaner that is connected of flue gas pipeline therewith, this sack cleaner is connected with desulfuration absorbing tower, therewith the two-stage demister, air blast, the slurry pump I that are connected of desulfuration absorbing tower; The hydrocyclone that is connected of slurry pump I therewith; It is characterized in that described hydrocyclone also is connected with filter with the slurry pump II, described slurry pump II also is connected with dewatering screen, and described dewatering screen also is connected with the gypsum storehouse with filter respectively.
Described dewatering screen is a high-frequency dewatering screen.
Described filter is a plate and frame filter press.
A kind of method of utilizing above-mentioned flue gas desulphurization system to carry out flue gas desulfurization is characterized in that comprising the following steps:
1) carries lime stone slurry circulation up and down in desulfuration absorbing tower of coming from the lime stone slurry feed pipe; Flue gas gets into desulfuration absorbing tower after the flue gas pipeline is sent into the sack cleaner dedusting; Flue gas and the reverse absorbing contact of lime stone slurry in the desulfuration absorbing tower; Flue gas is dissolved in the lime stone slurry in the oxidation trough of desulfuration absorbing tower bottom, and air blast is air blast in desulfuration absorbing tower, and lime stone slurry is oxidized to calcium sulfite; Crystallization generates gypsum slurries, and the flue gas after the desulfurization enters flue after dehumidifying through top two-stage demister;
2) the slurry pump I is discharged gypsum slurries from the oxidation trough on absorption tower; Being condensed into concentration through hydrocyclone is 40%～60% slurries; The underflow density of its hydrocyclone is that 40%～60% slurries pump into dewatering screen with the slurry pump II and dewater; The overflow of its hydrocyclone feeds filter and filters; The gypsum of oversize moisture content＜15% of described dewatering screen is stored in the gypsum storehouse, and the minus mesh of hydrocyclone overflow and few partial dehydration sieve is filtered the back siccative with filter and is stored in the gypsum storehouse, and clear water recycles.
Advantage of the present invention: the present invention has increased filter and dewatering screen in the back of the hydrocyclone of flue gas desulphurization system; Owing to adopted the dewatering screen dehydration, solved gypsum effectively and be difficult for dehydration problem, and product gypsum added value is high; Water recycles, using water wisely.
Description of drawings
Fig. 1 is a flue gas desulphurization system block diagram of the present invention.
The specific embodiment
Below in conjunction with the description of drawings specific embodiment of the present invention.
As shown in Figure 1: flue gas desulphurization system of the present invention; Comprise the desulfuration absorbing tower 5 that is connected with lime stone slurry feed pipe 1, the flue gas pipeline 2 that is located at these desulfuration absorbing tower 5 system tops; The sack cleaner 3 that is connected of flue gas pipeline 2 therewith; This sack cleaner 3 is connected with desulfuration absorbing tower 5, the two-stage demister 4, air blast 7, the slurry pump I 6 that are connected of desulfuration absorbing tower 5 therewith, the hydrocyclone 8 that is connected of slurry pump I 6 therewith; It is characterized in that described hydrocyclone 8 also is connected with filter 11 with slurry pump II 9, described filter 11 adopts plate and frame filter press; Described slurry pump II 9 also is connected with dewatering screen 10, and its high-frequency dewatering screen 10 is a high-frequency dewatering screen, and described high-frequency dewatering screen 10 also is connected with the gypsum storehouse with plate and frame filter press 11 respectively.
Adopt the method for carrying out flue gas desulfurization of flue gas desulphurization system of the present invention, comprise the following steps:
1) carries lime stone slurry circulation up and down in desulfuration absorbing tower 5 of coming from lime stone slurry feed pipe 1; Flue gas gets into desulfuration absorbing tower 5 after flue gas pipeline 2 is sent into sack cleaner 3 dedustings; Flue gas and the reverse absorbing contact of lime stone slurry in the desulfuration absorbing tower 5; Flue gas is dissolved in the lime stone slurry in the oxidation trough of desulfuration absorbing tower 5 bottoms, air blast 7 air blast in desulfuration absorbing tower 5, and lime stone slurry is oxidized to calcium sulfite; Crystallization generates gypsum slurries, and the flue gas after the desulfurization enters flue after dehumidifying through top two-stage demister 4;
2) slurry pump I 6 is discharged gypsum slurries from the oxidation trough on absorption tower 5; Being condensed into concentration through hydrocyclone 8 is 40%～60% slurries; The underflow density of its hydrocyclone 8 is that 40%～60% slurries pump into high-frequency dewatering screen 10 with slurry pump II 9 and dewater; The overflow of its hydrocyclone 8 feeds plate and frame filter press 11 press filtrations; The gypsum of oversize moisture content＜15% of described high-frequency dewatering screen 10 is stored in the gypsum storehouse, the minus mesh of the overflow of hydrocyclone 8 and few part high-frequency dewatering screen 10 with plate and frame filter press 11 press filtrations after siccative be stored in the gypsum storehouse, clear water recycles.
The present invention has increased plate and frame filter press and high-frequency dewatering screen owing to be employed in the back of the hydrocyclone of flue gas desulphurization system; Adopted the high-frequency dewatering screen dehydration; Solved gypsum effectively and be difficult for dehydration problem, and product gypsum added value is high, water recycles; Using water wisely can not form secondary pollution.
Claims (4)
1. flue gas desulphurization system; Comprise the desulfuration absorbing tower that is connected with the lime stone slurry feed pipe, the flue gas pipeline that is located at this desulphurization absorption tower system top; The sack cleaner that is connected of flue gas pipeline therewith, this sack cleaner is connected with desulfuration absorbing tower, therewith the two-stage demister, air blast, the slurry pump I that are connected of desulfuration absorbing tower; The hydrocyclone that is connected of slurry pump I therewith; It is characterized in that described hydrocyclone also is connected with filter with the slurry pump II, described slurry pump II also is connected with dewatering screen, and described dewatering screen also is connected with the gypsum storehouse with filter respectively.
2. flue gas desulphurization system according to claim 1 is characterized in that described dewatering screen is a high-frequency dewatering screen.
3. flue gas desulphurization system according to claim 1 is characterized in that described filter is a plate and frame filter press.
4. a method of utilizing the described flue gas desulphurization system of claim 1 to carry out flue gas desulfurization is characterized in that comprising the following steps:
1) carries lime stone slurry circulation up and down in desulfuration absorbing tower of coming from the lime stone slurry feed pipe; Flue gas gets into desulfuration absorbing tower after the flue gas pipeline is sent into the sack cleaner dedusting; Flue gas and the reverse absorbing contact of lime stone slurry in the desulfuration absorbing tower; Flue gas is dissolved in the lime stone slurry in the oxidation trough of desulfuration absorbing tower bottom, and air blast is air blast in desulfuration absorbing tower, and lime stone slurry is oxidized to calcium sulfite; Crystallization generates gypsum slurries, and the flue gas after the desulfurization enters flue after dehumidifying through top two-stage demister;
2) the slurry pump I is discharged gypsum slurries from the oxidation trough on absorption tower; Being condensed into concentration through hydrocyclone is 40%～60% slurries; The underflow density of its hydrocyclone is that 40%～60% slurries pump into dewatering screen with the slurry pump II and dewater; The overflow of its hydrocyclone feeds filter and filters; The gypsum of oversize moisture content＜15% of described dewatering screen is stored in the gypsum storehouse, and the minus mesh of hydrocyclone overflow and few partial dehydration sieve is filtered the back siccative with filter and is stored in the gypsum storehouse, and clear water recycles.
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| CN2011104313571A CN102489143A (en) | 2011-12-21 | 2011-12-21 | Flue-gas desulphurization system and flue-gas desulphurization method |
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| CN2011104313571A CN102489143A (en) | 2011-12-21 | 2011-12-21 | Flue-gas desulphurization system and flue-gas desulphurization method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104707466A (en) * | 2015-03-30 | 2015-06-17 | 赵民 | Water-balance energy-saving and water-saving system for wet desulphurization of limestone/lime |
| CN105314905A (en) * | 2014-07-21 | 2016-02-10 | 上海境闲机械设备制造有限公司 | Dewatering technology for desulfurized gypsum |
| CN109647101A (en) * | 2019-02-01 | 2019-04-19 | 国投钦州发电有限公司 | Wet method fume desulfurizing system based on four absorption towers |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1803689A (en) * | 2005-12-19 | 2006-07-19 | 北京朗新明环保科技有限公司 | Dehydration method and apparatus of flue gas desulfurization gypsum slurry |
| CN101229964A (en) * | 2008-02-01 | 2008-07-30 | 国电环境保护研究院 | Gypsum dehydration method for smoke-gas wet desulfurization |
| CN201304321Y (en) * | 2008-02-19 | 2009-09-09 | 孙伟杰 | A closed cycle desulphurization denitration and sulphur reclamation device |
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2011
- 2011-12-21 CN CN2011104313571A patent/CN102489143A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1803689A (en) * | 2005-12-19 | 2006-07-19 | 北京朗新明环保科技有限公司 | Dehydration method and apparatus of flue gas desulfurization gypsum slurry |
| CN101229964A (en) * | 2008-02-01 | 2008-07-30 | 国电环境保护研究院 | Gypsum dehydration method for smoke-gas wet desulfurization |
| CN201304321Y (en) * | 2008-02-19 | 2009-09-09 | 孙伟杰 | A closed cycle desulphurization denitration and sulphur reclamation device |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105314905A (en) * | 2014-07-21 | 2016-02-10 | 上海境闲机械设备制造有限公司 | Dewatering technology for desulfurized gypsum |
| CN105314905B (en) * | 2014-07-21 | 2020-05-12 | 上海国惠环保科技集团有限公司 | Desulfurization gypsum dehydration process |
| CN104707466A (en) * | 2015-03-30 | 2015-06-17 | 赵民 | Water-balance energy-saving and water-saving system for wet desulphurization of limestone/lime |
| CN109647101A (en) * | 2019-02-01 | 2019-04-19 | 国投钦州发电有限公司 | Wet method fume desulfurizing system based on four absorption towers |
| CN109647101B (en) * | 2019-02-01 | 2024-02-06 | 国投钦州发电有限公司 | Wet flue gas desulfurization system based on four absorption towers |
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Application publication date: 20120613 |