CN109908736B - Limestone gypsum wet desulfurization device - Google Patents
Limestone gypsum wet desulfurization device Download PDFInfo
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- CN109908736B CN109908736B CN201910261463.6A CN201910261463A CN109908736B CN 109908736 B CN109908736 B CN 109908736B CN 201910261463 A CN201910261463 A CN 201910261463A CN 109908736 B CN109908736 B CN 109908736B
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- slurry
- gypsum
- overflow
- thick liquid
- flow back
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- 239000010440 gypsum Substances 0.000 title claims abstract description 41
- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 41
- 235000019738 Limestone Nutrition 0.000 title claims abstract description 12
- 239000006028 limestone Substances 0.000 title claims abstract description 12
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 11
- 230000023556 desulfurization Effects 0.000 title claims abstract description 11
- 238000010521 absorption reaction Methods 0.000 claims abstract description 22
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 17
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 17
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000004571 lime Substances 0.000 claims abstract description 17
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 17
- 239000001301 oxygen Substances 0.000 claims abstract description 17
- 230000003647 oxidation Effects 0.000 claims abstract description 7
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims description 16
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 6
- 239000003546 flue gas Substances 0.000 claims description 6
- 239000002002 slurry Substances 0.000 abstract description 59
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 abstract description 14
- 230000000694 effects Effects 0.000 abstract description 3
- 101100399296 Mus musculus Lime1 gene Proteins 0.000 abstract 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 12
- 238000010992 reflux Methods 0.000 description 11
- 239000013078 crystal Substances 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 6
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- 230000002745 absorbent Effects 0.000 description 4
- 239000002250 absorbent Substances 0.000 description 4
- 230000018044 dehydration Effects 0.000 description 4
- 238000006297 dehydration reaction Methods 0.000 description 4
- 239000000428 dust Substances 0.000 description 4
- GBAOBIBJACZTNA-UHFFFAOYSA-L calcium sulfite Chemical compound [Ca+2].[O-]S([O-])=O GBAOBIBJACZTNA-UHFFFAOYSA-L 0.000 description 3
- 235000010261 calcium sulphite Nutrition 0.000 description 3
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 230000003009 desulfurizing effect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000007790 solid phase Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 239000011550 stock solution Substances 0.000 description 1
Abstract
The invention discloses a limestone gypsum wet desulfurization device which comprises an absorption tower, a slurry pond, a gypsum cyclone, a dehydrator and an oxidation fan, wherein the slurry pond is arranged in the absorption tower and is provided with a lime slurry inlet, a overflow flow-back opening and an oxygen inlet, and overflow of the gypsum cyclone flows into the slurry pond from the overflow flow-back opening. The device can ensure the activity of lime slurry, ensure the absorption rate of sulfur dioxide and is easy to implement.
Description
Technical Field
The invention relates to a desulfurization device, in particular to a limestone gypsum wet desulfurization device.
Background
The main principle of wet desulfurizing limestone gypsum is to use limestone or lime as desulfurizing absorbent, the limestone is crushed and ground into powder, and the powder is mixed with water to form absorbent slurry. In the absorption tower, the absorption slurry is contacted and mixed with the flue gas, sulfur dioxide in the flue gas is subjected to chemical reaction with calcium carbonate in the slurry and blown oxidized air so as to be removed, and the final reaction product is gypsum.
The existing limestone gypsum wet desulphurization device comprises an absorption tower, a slurry pond, a demister, a gypsum cyclone and a dehydrator, wherein the absorption tower is of a countercurrent spray empty tower structure, the absorption and oxidation functions are integrated, the upper part is an absorption area, the lower part is a slurry pond, and flue gas after dust removal is in countercurrent contact with circulating slurry in the absorption tower. The upper part of the absorption zone is provided with a demister, and the free moisture in the flue gas at the outlet of the demister is not more than 75mg/Nm3. The slurry after absorbing SO 2 enters a slurry pool for cyclic oxidation, and calcium sulfite is oxidized into gypsum crystals by blown air in the slurry pool. And discharging the slurry generated in the slurry pond reaction to a gypsum cyclone when the slurry reaches a certain density, discharging the gypsum cyclone, dehydrating the discharged material in a dehydrator, and refluxing the overflow of the gypsum cyclone to the slurry pond.
In the prior art, an overflow process pipeline of the gypsum cyclone and a replenishing liquid inlet pipeline of a slurry pond are arranged in the same layer, and overflow of the gypsum cyclone participates in a reaction process of new liquid, but the reflux liquid mainly uses heavy metals such as unreacted sufficient sulfite and dust, so that the dust can destroy the reaction. In addition, at this time, calcium sulfite hemihydrate is used for most of the slurry, so that calcium sulfate in the slurry is difficult to grow and dehydrate, a large amount of slurry is supplied for ensuring that the outlet sulfur dioxide reaches the standard, and a large amount of calcium sulfate hemihydrate and calcium sulfate which cannot be dehydrated in the slurry can prevent decomposition of calcium carbonate and absorption of sulfur dioxide, so that the activity of the slurry is greatly reduced, and the situation is the most complex and difficult to treat.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a limestone gypsum wet desulphurization device which solves the problems of low reactivity of slurry in a slurry pond and reduced absorption rate of sulfur dioxide.
The technical scheme of the invention is as follows: the utility model provides a limestone gypsum wet flue gas desulfurization device, includes absorption tower, thick liquid pond, gypsum swirler, hydroextractor and oxidation fan, the thick liquid pond set up in the absorption tower, the thick liquid pond is equipped with lime slurry entry, overflow flow back mouth and oxygen entry, the overflow of gypsum swirler is followed overflow flow back mouth flows in the thick liquid pond, the setting height of lime slurry entry is higher than overflow flow back mouth and oxygen entry, overflow flow back mouth and oxygen entry set up the difference in height be not more than 0.5m, the lime slurry entry with overflow flow back mouth set up the difference in height be more than 1m.
Further, the overflow return port is arranged at a height not less than 2.5m from the bottom of the slurry tank.
Preferably, the overflow reflux opening is arranged at a height of 2.8-3.1 m from the bottom of the slurry pool.
Preferably, the side wall of the slurry tank is provided with a side stirrer, the rotating shaft of the side stirrer is in a horizontal direction, the setting height difference between the side stirrer and the oxygen inlet is not more than 0.5m, and the setting height difference between the side stirrer and the overflow reflux port is not more than 0.5m.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
The gypsum cyclone containing sulfite and dust overflows and flows back to the slurry pool and then can fully contact with oxygen to react to generate calcium sulfate, so that the calcium sulfate can be prevented from directly contacting with lime slurry stock solution in the slurry pool, the system balance of lime and sulfur dioxide is destroyed, the activity of the lime slurry is ensured, and the absorption rate of the sulfur dioxide is ensured to meet the desulfurization requirement. The device is easy to be modified based on the existing limestone gypsum wet desulphurization device, and has the advantages of less modification equipment, low manufacturing cost and contribution to popularization and implementation.
Drawings
Fig. 1 is a schematic structural view of a limestone-gypsum wet desulfurization apparatus.
Detailed Description
The present application is further described below with reference to examples, which are to be construed as merely illustrative of the present application and not a limitation of the scope of the present application, since various modifications to the equivalent arrangements of the present application will become apparent to those skilled in the art upon reading the present application, which are intended to be within the scope of the appended claims.
Referring to fig. 1, the limestone-gypsum wet desulfurization device according to this embodiment includes an absorption tower 1, a slurry tank 2, a gypsum cyclone 3, a vacuum dewatering belt conveyor 4 and an oxidation fan 5, wherein a demister 6, a spray layer 7 and the slurry tank 2 are sequentially disposed in the absorption tower 1 from top to bottom. The bottom of the slurry pond 2 is connected with a gypsum pump 8 through a pipeline 9. The reacted calcium sulfate slurry and the unreacted small amount of calcium sulfite slurry and other impurities in the absorption tower 1 are pumped into the gypsum cyclone 3 through the pipeline 9 by the gypsum pump 8. The gypsum cyclone 3 concentrates and grades the slurry pumped by the gypsum pump 8, the dilute overflow returns to the absorption tower 1 through the overflow pipeline 10, enters the slurry tank 2 from the overflow reflux port 2a, and the concentrated underflow is sent to the vacuum dehydration belt conveyor 4 for gypsum dehydration. Lime slurry is replenished in the slurry tank 2 through a lime slurry inlet 2b, and an oxidation fan 5 is connected to an oxygen inlet 2c of the slurry tank 2 through an air pipeline to replenish oxygen to the slurry in the slurry tank 2. On the slurry tank 2, the setting height of the lime slurry inlet 2b is higher than the setting height of the overflow reflux port 2a and the oxygen inlet 2c, the setting height difference of the overflow reflux port 2a and the oxygen inlet 2c is not more than 0.5m, the setting height difference of the lime slurry inlet 2b and the overflow reflux port 2a is more than 1m, the setting height of the overflow reflux port 2a is 2.8-3.1 m away from the bottom of the slurry tank 2, and the setting height of the overflow reflux port is about 3 m. In addition, a side stirrer 11 is arranged on the side wall of the slurry pond 2, the rotating shaft of the side stirrer 11 is in the horizontal direction, the setting height difference between the side stirrer 11 and the oxygen inlet 2c is not more than 0.5m, and the setting height difference between the side stirrer 11 and the overflow reflux port 2a is not more than 0.5m. The arrangement is such that the side agitators 11, the oxygen inlet 2c and the overflow return port 2a are located at substantially the same reaction level of the slurry in the slurry tank 2 below the level of fresh lime slurry. The overflow solid content of the gypsum cyclone 3 is generally about 1-3% (mass content), and the solid phase particles are fine and mainly comprise an absorbent which is not completely reacted, gypsum small crystals and the like. The absorbent which is not fully reacted continuously participates in the desulfurization reaction, and the gypsum small crystals are used as crystal nucleus with large crystal growth in the slurry tank, so that the formation of the gypsum large crystals in the next stage is influenced. So that the middle part of the slurry pool 2 which is refluxed is contacted and reacted with the supplementary oxygen under the action of the side stirrer 11 to oxidize into sulfate radical until qualified calcium sulfate is produced, and gypsum dehydration is performed again. The underflow solid content of the gypsum cyclone 3 is generally about 45-50% (mass content), the solid phase is mainly coarse gypsum crystals, and the purpose of the vacuum dehydration belt conveyor 4 is to remove free water among the large crystal particles.
Claims (1)
1. The utility model provides a limestone gypsum wet flue gas desulfurization device, includes absorption tower, thick liquid pond, gypsum swirler, hydroextractor and oxidation fan, the thick liquid pond set up in the absorption tower, the thick liquid pond is equipped with lime thick liquid entry, overflow flow back mouth and oxygen entry, the overflow of gypsum swirler is followed overflow flow back mouth flows in the thick liquid pond, its characterized in that, lime thick liquid entry set up the high being higher than overflow flow back mouth and oxygen entry, overflow flow back mouth and oxygen entry set up the difference in height be not more than 0.5m, lime thick liquid entry with overflow flow back mouth set up the difference in height be more than 1m, overflow flow back mouth set up the high distance the bottom of thick liquid pond is 2.8 ~ 3.1m, the lateral wall of thick liquid pond is equipped with the side agitator, the side agitator pivot is the horizontal direction, the difference in height be not more than 0.5m with the oxygen entry, the difference in height be not more than 0.5m with the overflow flow back mouth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910261463.6A CN109908736B (en) | 2019-04-02 | 2019-04-02 | Limestone gypsum wet desulfurization device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910261463.6A CN109908736B (en) | 2019-04-02 | 2019-04-02 | Limestone gypsum wet desulfurization device |
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| Publication Number | Publication Date |
|---|---|
| CN109908736A CN109908736A (en) | 2019-06-21 |
| CN109908736B true CN109908736B (en) | 2024-04-30 |
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| CN201910261463.6A Active CN109908736B (en) | 2019-04-02 | 2019-04-02 | Limestone gypsum wet desulfurization device |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5308509A (en) * | 1993-03-08 | 1994-05-03 | The Babcock & Wilcox Company | FGD performance enhancement by hydroclone and recycling steps |
| CN1745881A (en) * | 2005-08-16 | 2006-03-15 | 孙克勤 | Gypsum pulp dewatering device and method for wetting smoke desulfurizing system |
| JP2009220021A (en) * | 2008-03-17 | 2009-10-01 | Babcock Hitachi Kk | Wet-type flue gas desulfurization apparatus |
| CN102921287A (en) * | 2012-10-30 | 2013-02-13 | 北京国电龙源环保工程有限公司 | Double-tower double-circulation limestone wet method desulfurization device and method |
| CN103599690A (en) * | 2013-11-12 | 2014-02-26 | 山东中实易通集团有限公司 | Composite limestone/calcium hydroxide gypsum wet desulfurization device and technique |
| CN204034553U (en) * | 2014-08-19 | 2014-12-24 | 北京禹泰环保工程有限公司 | Lime-gypsum method tower outer circulation desulphurization plant |
| CN205760582U (en) * | 2016-06-27 | 2016-12-07 | 山东淙汇工业科技有限公司 | Limestone-plaster wet desulfurizing system |
| CN205903789U (en) * | 2016-03-25 | 2017-01-25 | 杨生玉 | Concentrated oxidative desulfurization device of carbide ash or carbide slag two -stage |
| CN210009826U (en) * | 2019-04-02 | 2020-02-04 | 江苏鑫华能环保工程股份有限公司 | Limestone gypsum wet desulphurization device |
-
2019
- 2019-04-02 CN CN201910261463.6A patent/CN109908736B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5308509A (en) * | 1993-03-08 | 1994-05-03 | The Babcock & Wilcox Company | FGD performance enhancement by hydroclone and recycling steps |
| CN1745881A (en) * | 2005-08-16 | 2006-03-15 | 孙克勤 | Gypsum pulp dewatering device and method for wetting smoke desulfurizing system |
| JP2009220021A (en) * | 2008-03-17 | 2009-10-01 | Babcock Hitachi Kk | Wet-type flue gas desulfurization apparatus |
| CN102921287A (en) * | 2012-10-30 | 2013-02-13 | 北京国电龙源环保工程有限公司 | Double-tower double-circulation limestone wet method desulfurization device and method |
| CN103599690A (en) * | 2013-11-12 | 2014-02-26 | 山东中实易通集团有限公司 | Composite limestone/calcium hydroxide gypsum wet desulfurization device and technique |
| CN204034553U (en) * | 2014-08-19 | 2014-12-24 | 北京禹泰环保工程有限公司 | Lime-gypsum method tower outer circulation desulphurization plant |
| CN205903789U (en) * | 2016-03-25 | 2017-01-25 | 杨生玉 | Concentrated oxidative desulfurization device of carbide ash or carbide slag two -stage |
| CN205760582U (en) * | 2016-06-27 | 2016-12-07 | 山东淙汇工业科技有限公司 | Limestone-plaster wet desulfurizing system |
| CN210009826U (en) * | 2019-04-02 | 2020-02-04 | 江苏鑫华能环保工程股份有限公司 | Limestone gypsum wet desulphurization device |
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| CN109908736A (en) | 2019-06-21 |
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