CN102210967A - Two-stage treatment wet desulphurization method for high-sulfur coal-fired flue gas - Google Patents
Two-stage treatment wet desulphurization method for high-sulfur coal-fired flue gas Download PDFInfo
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- CN102210967A CN102210967A CN2011100375225A CN201110037522A CN102210967A CN 102210967 A CN102210967 A CN 102210967A CN 2011100375225 A CN2011100375225 A CN 2011100375225A CN 201110037522 A CN201110037522 A CN 201110037522A CN 102210967 A CN102210967 A CN 102210967A
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- absorption tower
- horizontal flow
- flue gas
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- spray
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N carbon monoxide Chemical compound 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[O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 29
- 239000003546 flue gas Substances 0.000 title claims abstract description 29
- 239000011593 sulfur Substances 0.000 title abstract description 8
- 229910052717 sulfur Inorganic materials 0.000 title abstract description 8
- 238000010521 absorption reaction Methods 0.000 claims abstract description 120
- 239000007921 spray Substances 0.000 claims abstract description 77
- 239000002002 slurry Substances 0.000 claims abstract description 60
- 230000003647 oxidation Effects 0.000 claims abstract description 29
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 29
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound 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[C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 18
- 239000003245 coal Substances 0.000 claims description 18
- NINIDFKCEFEMDL-UHFFFAOYSA-N sulfur Chemical compound 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[S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 17
- 229910052602 gypsum Inorganic materials 0.000 claims description 16
- 239000010440 gypsum Substances 0.000 claims description 16
- 239000007789 gas Substances 0.000 claims description 13
- 239000005864 Sulphur Substances 0.000 claims description 12
- 238000006477 desulfuration reaction Methods 0.000 claims description 10
- 230000003009 desulfurizing Effects 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 4
- 230000035695 Efflux Effects 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 239000011505 plaster Substances 0.000 abstract description 2
- 239000006096 absorbing agent Substances 0.000 abstract 2
- 230000002745 absorbent Effects 0.000 description 18
- 239000002250 absorbent Substances 0.000 description 18
- RAHZWNYVWXNFOC-UHFFFAOYSA-N sulphur dioxide Chemical compound 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O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 16
- 238000005507 spraying Methods 0.000 description 9
- 239000000779 smoke Substances 0.000 description 6
- 230000000875 corresponding Effects 0.000 description 4
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- GBAOBIBJACZTNA-UHFFFAOYSA-L Calcium sulfite Chemical compound 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Abstract
The invention discloses a two-stage treatment wet desulphurization method for high-sulfur coal-fired flue gas. In the method, a horizontal flow absorption tower, a reverse flow spray absorber, an oxidation blower, a stock tank, a stirrer, a plaster discharge pump, an oxidation spray gun, a circulating slurry pump, a mechanical demister, and a spray layer device are arranged. Flue gas from a draught fan passes through the conventional flue, enters the horizontal flow absorption tower to be subjected to first-stage treatment, is washed, and enters the reverse flow spray absorber to be subjected to second-stage desulphurization; and the purified flue gas passes through the demister and is discharged through a chimney. The method is suitable for treating high-sulfur coal-fired flue gas, and has the characteristics of small occupied area, low investment, high desulphurization efficiency, low energy consumption, stable operation and the like.
Description
Technical field
The invention belongs to industrial waste gas purifying environmental protection and energy field, particularly bi-level treatment sulphur coal smoke-gas wet desulfurization method.
Background technology
Absorbent-gypsum wet sulfur removal technology is that current China uses at most, the most effective boiler fume desulfurizing method, and the design desulfuration efficiency is not less than 95%.But power plant produces with coal and can only determine that sulfur content significantly increases in the coal according to the market supply situation at present, makes burning coal and design ature of coal have bigger difference, and former design desulfurizer can not satisfy the sulfur dioxide (SO2) emissions requirement.In addition, some newly-built unit is subjected to the restriction of regional coal-fired ature of coal, and the design coal sulfur content just reaches 4% ~ 5%, if by existing process system design, will be difficult to realize the qualified discharge of sulfur dioxide.
At present, absorbent-gypsum wet sulfur removal technology is when handling the sulphur coal flue gas, and the pH value of loop slurry is restricting the absorption efficiency of sulfur dioxide and the oxidation efficiency of calcium sulfite simultaneously.Absorption efficiency height when loop slurry pH value is high but oxidation efficiency is low can accelerating oxidation when the pH value is low but absorption efficiency is low.Implement bi-level treatment sulphur coal flue gas wet desulphurization process, can take into account calcium sulfite oxidation efficient and sulfur dioxide absorption efficiency simultaneously.
Summary of the invention
The object of the present invention is to provide a kind of fume desulphurization method that is applicable to the sulphur coal boiler; Also be applicable to simultaneously the extending capacity reformation of original desulfurizer.
A kind of bi-level treatment sulphur coal smoke-gas wet desulfurization method of the present invention comprises horizontal flow absorption tower, countercurrent spray absorption tower, stock tank, agitator, oxidation spray gun, recycle slurry liquid pump, gypsum excavationg pump, demister, oxidation fan and spray equipment.This method step is:
(1) flue gas is after the pipeline air-introduced machine enters the horizontal flow absorption tower and handles, and series connection enters the countercurrent spray absorption tower and handles again;
(2) stock tank in horizontal flow absorption tower and countercurrent spray absorption tower is provided with agitator, carries out slurries and stirs, and simultaneously, with the oxidation spray gun oxidation air is sent into horizontal flow absorption tower and countercurrent spray absorption tower;
(3) in horizontal flow absorption tower and countercurrent spray absorption tower, be provided with spray equipment, by the recycle slurry liquid pump slurries in the stock tank are sent into spray equipment, respectively flue gas is washed absorption, the pH value of slurries is higher than the PH of slurries in the horizontal flow absorption tower in the countercurrent spray absorption tower;
(4) slurries in the countercurrent spray absorption tower enter the horizontal flow absorption tower by overflow pipe.The gypsum slurries of the generation in the horizontal flow absorption tower effluxes by the gypsum excavationg pump that is provided with for the horizontal flow absorption tower;
(5) behind the drop of flue gas after being purified in demister removal flue gas, discharge by the exhanst gas outlet baffle door.
Slurries in the countercurrent spray absorption tower are 5.8-6.5 at pH value, and slurries is 4.0-5.0 at pH value in the horizontal flow absorption tower.
Horizontal flow of the present invention absorption tower is provided with three layers of spraying layer, three circulating pumps, and the corresponding circulating pump of each layer spray also is provided with side-feeding mixer, oxidation spray gun, gypsum excavationg pump.
Countercurrent spray of the present invention absorption tower is provided with three layers of spraying layer, and three circulating pumps are set, and the corresponding circulating pump of each layer spray also is provided with side-feeding mixer, oxidation spray gun, demister and slurries overflow pipe.
Also be provided with absorbent for the slurry case in system of the present invention, and four absorbent slurry supply pumps, wherein two slurry supply pumps are for slurry feedwater smoothing absorbing tower, give the countercurrent spray absorption tower for slurry for two in addition.Fresh absorbent slurry joins separately absorption tower pump entry pipeline by separately absorbent slurry supply pump respectively, be the absorption efficiency of assurance sulfur dioxide and the oxidation efficiency of calcium sulfite, two absorption tower stock tanks move in suitable separately pH value scope.The sprayed slurry of each tower spraying layer is collected in the stock tank of its bottom, absorption tower, and feeds oxidation wind evenly mixing in stock tank of stock tank.The pH value on countercurrent spray absorption tower moves in 5.8-6.5 scope, the absorption of suitable sulfur dioxide; The pH value on horizontal flow absorption tower moves in 4.0-5.0 scope, is suitable for gypsum crystallization.The gypsum plasma discharge of whole absorption system is discharged by the gypsum excavationg pump that is provided with for the horizontal flow absorption tower.
Flue gas system of the present invention, export former flue by air-introduced machine, the import and export flue on horizontal flow absorption tower, the clean flue gas flue of horizontal flow absorption tower outlet, flue pipe nipple between outlet of horizontal flow adsorption tower smoke and the countercurrent spray adsorption tower smoke inlet, and the import and export flue on countercurrent spray absorption tower, the clean flue gas flue of countercurrent spray tower outlet is formed, wherein the gas approach on the exhaust pass on horizontal flow absorption tower and countercurrent spray absorption tower adopts cascaded structure, keeps the flue between the former smoke inlet on clean exhanst gas outlet in horizontal flow absorption tower and countercurrent spray absorption tower shorter as far as possible.Prevent the flue gas after the washing of horizontal flow absorption tower, through this section flue the time, the slurries drop that flue gas carries deposits in this section flue in a large number.
Adopt the present invention can realize that boiler uses sulphur coal flue gas desulfurization and handles, also the operation on horizontal flow absorption tower and the sulfur content signal of flue gas CMES system can be introduced DCS, carry out interlocked control.
The present invention is applicable to that the desulfurization of sulphur coal flue gas handles, and reduced investment, efficient height, energy consumption are low, stable.
Description of drawings
Fig. 1 is the schematic flow sheet of bi-level treatment sulphur coal smoke-gas wet desulfurization method, wherein:
1 is former smoke inlet baffle door, 2 is the horizontal flow absorption tower, 3 is horizontal flow absorption tower spraying layer, 4 is horizontal flow absorption tower circulating pump, 5 is horizontal flow absorption tower stock tank, 6 is the gypsum excavationg pump, 7 is horizontal flow absorption tower side-feeding mixer, and 8 is horizontal flow absorption tower oxidation spray gun, and 9 is oxidation fan, 10 is countercurrent spray absorption tower oxidation spray gun, 11 is countercurrent spray absorption tower side-feeding mixer, and 12 is countercurrent spray absorption tower stock tank, and 13 is countercurrent spray absorption tower circulating pump, 14 is countercurrent spray absorption tower overflow pipe, 15 is countercurrent spray absorption tower spraying layer, and 16 is the countercurrent spray absorption tower, and 17 is countercurrent spray absorption tower demisting device, 18 is clean exhanst gas outlet baffle door, 19 is absorption tower district melt pit, and 20 for absorbent supplies the slurry case, and 21 is horizontal flow absorptive tower absorbent slurry supply pump, 22 is countercurrent spray tower absorbent slurry supply pump, and 23 are absorbent confession slurry box mixer.
The specific embodiment
Below in conjunction with accompanying drawing enforcement of the present invention is described further.
The boiler smoke that uses sulphur coal is through boiler induced-draft fan, by former flue gas flue, enter horizontal flow absorption tower 2 through former smoke inlet baffle door 1, with horizontal flow absorption tower spraying layer 3, the spray slurry of ejection drenches slurries and reacts, loop slurry behind the absorption reaction is collected in the horizontal flow absorption tower stock tank 5, horizontal flow absorption tower spraying layer 3 is corresponding with horizontal flow absorption tower circulating pump 4, for preventing the deposition of slurries in the horizontal flow absorption tower, the slurries that the horizontal flow absorption tower is provided with in 7 pairs of stock tanks of side-feeding mixer 5 stir, this agitator not only can prevent the stock tank deposition in the stock tank, and can also the oxidation wind that be blown into through horizontal flow absorption tower oxidation spray gun 8 is uniform in the stock tank 5 of horizontal flow absorption tower.Oxidation wind is provided by oxidation fan 9.
Flue gas after 2 washings of horizontal flow absorption tower enters countercurrent spray absorption tower 16, with the sprayed slurry that countercurrent spray absorption tower spraying layer 15 sprays, carries out secondary washing and absorbs, and reacted loop slurry is collected in the countercurrent spray absorption tower stock tank 12.Countercurrent spray absorption tower spraying layer 15 is corresponding with countercurrent spray absorption tower circulating pump 13, for preventing the deposition of slurries in the countercurrent spray absorption tower, the slurries that the countercurrent spray absorption tower is provided with in 11 pairs of stock tanks of side-feeding mixer 12 stir, this agitator not only can prevent the stock tank deposition in the stock tank, and can also the oxidation wind that be blown in the countercurrent spray absorption tower 16 through countercurrent spray absorption tower oxidation spray gun 10 is uniform in the stock tank 12 of countercurrent spray absorption tower.Oxidation wind is provided by oxidation fan 9.
Slurries in horizontal flow absorption tower stock tank 5 and the countercurrent spray absorption tower stock tank 12 move in different pH value scopes, and the slurries pH value in the countercurrent spray absorption tower stock tank 12 remains in 5.8-6.5 scopes, to guarantee the abundant absorption of sulfur dioxide.Slurries pH value in the horizontal flow absorption tower stock tank 5 remains on 4.0-5.0, to guarantee effective generation of desulfurated plaster.Slurries in the countercurrent spray absorption tower 16 can enter horizontal flow absorption tower 2 by countercurrent spray absorption tower overflow pipe 14.The gypsum slurries that generates in horizontal flow absorption tower 2 is squeezed into follow-up gypsum dehydration treatment system through the gypsum excavationg pump 6 that is provided with for horizontal flow absorption tower 2.Clean flue gas up to standard fully after the desulfurization is removed the drop that carries in the flue gas through countercurrent spray absorption tower machinery demister 17, again through clean exhanst gas outlet baffle door 18, through the chimney qualified discharge.
The one-level of carrying out in the horizontal flow absorption tower 2 is handled, and the used absorbent of washing flue gas is provided by horizontal flow absorptive tower absorbent slurry supply pump 21.What carry out in the countercurrent spray absorption tower 16 is two stage treatment, and the used absorbent of washing flue gas is provided by countercurrent spray absorptive tower absorbent slurry supply pump 22.Horizontal flow absorptive tower absorbent slurry supply pump 21 and countercurrent spray absorptive tower absorbent slurry supply pump 22, with absorbent for the stored slurries of slurry case 20, squeeze into the inlet duct of horizontal flow absorption tower circulating pump 4 and the inlet duct of countercurrent spray absorption tower circulating pump 13 respectively.For preventing that absorbent slurry from depositing for starching in the case 20 at absorbent, be provided with absorbent for slurry box mixer 23.
Absorption tower district melt pit 19 is that the 16 liang of towers in horizontal flow absorption tower 2 and countercurrent spray absorption tower are shared.When two towers need overhaul, a spot of slurries and flushing water can enter in the absorption tower district melt pit 19 by the floss hole separately in the tower.
Claims (2)
1. a bi-level treatment sulphur coal smoke-gas wet desulfurization method comprises horizontal flow absorption tower, countercurrent spray absorption tower, stock tank, agitator, oxidation spray gun, recycle slurry liquid pump, gypsum excavationg pump, demister, oxidation fan and spray equipment.It is characterized in that this method step is:
(1) flue gas is after the pipeline air-introduced machine enters the horizontal flow absorption tower and handles, and series connection enters the countercurrent spray absorption tower and handles again;
(2) stock tank in horizontal flow absorption tower and countercurrent spray absorption tower is provided with agitator, carries out slurries and stirs, and simultaneously, with the oxidation spray gun oxidation air is sent into horizontal flow absorption tower and countercurrent spray absorption tower;
(3) in horizontal flow absorption tower and countercurrent spray absorption tower, be provided with spray equipment, by the recycle slurry liquid pump slurries in the stock tank are sent into spray equipment, respectively flue gas is washed absorption, the pH value of slurries is higher than the PH of slurries in the horizontal flow absorption tower in the countercurrent spray absorption tower;
(4) slurries in the countercurrent spray absorption tower enter the horizontal flow absorption tower by overflow pipe.The gypsum slurries of the generation in the horizontal flow absorption tower effluxes by the gypsum excavationg pump that is provided with for the horizontal flow absorption tower;
(5) behind the drop of flue gas after being purified in demister removal flue gas, discharge by the exhanst gas outlet baffle door.
2. bi-level treatment sulphur coal smoke-gas wet desulfurization method according to claim 1 is characterized in that the slurries in the countercurrent spray absorption tower are 5.8-6.5 at pH value, and slurries is 4.0-5.0 at pH value in the horizontal flow absorption tower.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103203170A (en) * | 2013-04-11 | 2013-07-17 | 周勇定 | Flue-gas cleaner |
| CN105214469A (en) * | 2015-08-31 | 2016-01-06 | 盐城市赛隆节能技术工程有限公司 | Advection adverse current composite desulfate absorption tower |
| CN105268306A (en) * | 2015-11-23 | 2016-01-27 | 金川集团股份有限公司 | Low-concentration sulfur dioxide smelting off-gas desulphurization device and method |
| CN105749730A (en) * | 2016-03-08 | 2016-07-13 | 北京峰业电力环保工程有限公司 | Absorbing tower slurry oxidation device |
| CN109939554A (en) * | 2019-03-19 | 2019-06-28 | 华北电力大学（保定） | A kind of white clay desulphurization system and its sulfur method |
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| CN201023021Y (en) * | 2007-01-17 | 2008-02-20 | 孙克勤 | U-shaped adsorbing area horizontal-flow adsorption tower |
| CN101927125A (en) * | 2010-09-10 | 2010-12-29 | 浙江浙大网新机电工程有限公司 | Dual-circulation absorption tower |
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| CN201023021Y (en) * | 2007-01-17 | 2008-02-20 | 孙克勤 | U-shaped adsorbing area horizontal-flow adsorption tower |
| CN101927125A (en) * | 2010-09-10 | 2010-12-29 | 浙江浙大网新机电工程有限公司 | Dual-circulation absorption tower |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103203170A (en) * | 2013-04-11 | 2013-07-17 | 周勇定 | Flue-gas cleaner |
| CN105214469A (en) * | 2015-08-31 | 2016-01-06 | 盐城市赛隆节能技术工程有限公司 | Advection adverse current composite desulfate absorption tower |
| CN105268306A (en) * | 2015-11-23 | 2016-01-27 | 金川集团股份有限公司 | Low-concentration sulfur dioxide smelting off-gas desulphurization device and method |
| CN105749730A (en) * | 2016-03-08 | 2016-07-13 | 北京峰业电力环保工程有限公司 | Absorbing tower slurry oxidation device |
| CN109939554A (en) * | 2019-03-19 | 2019-06-28 | 华北电力大学（保定） | A kind of white clay desulphurization system and its sulfur method |
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Application publication date: 20111012 |