CN101229964A - Gypsum dehydration method for smoke-gas wet desulfurization - Google Patents
Gypsum dehydration method for smoke-gas wet desulfurization Download PDFInfo
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- CN101229964A CN101229964A CNA200810018954XA CN200810018954A CN101229964A CN 101229964 A CN101229964 A CN 101229964A CN A200810018954X A CNA200810018954X A CN A200810018954XA CN 200810018954 A CN200810018954 A CN 200810018954A CN 101229964 A CN101229964 A CN 101229964A
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- gypsum
- liquid
- slurry
- cyclone
- absorption tower
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B11/00—Calcium sulfate cements
- C04B11/26—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke
- C04B11/262—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke waste gypsum other than phosphogypsum
- C04B11/264—Gypsum from the desulfurisation of flue gases
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to a method for dehydrating wet flue gas desulfurization gypsum, which consists of the following steps: sulfur in flue gas is sprayed and absorbed by limestone slurry and is oxidized to the gypsum by air; the gypsum slurry is absorbed by a slurry pump from an absorption tower; a large part of the slurry is reflux liquid and a small part is sent to a gypsum cyclone; a part of the superfluent liquid of the gypsum cyclone is the reflux liquid and another part is sent to a wastewater cyclone; underset concentration of the gypsum cyclone is put in a vacuum belt dehydrator to be dehydrated to obtain solid gypsum; the superfluent of the wastewater cyclone is sent to a wastewater treatment system; filtrate of the vacuum belt dehydrator, the underset slurry of the wastewater cyclone, the reflux liquid of the gypsum slurry extracted from the absorption tower and the superfluent reflux liquid of the cyclone are flowed together into a collecting tube; the liquid is guided in a trench through the collecting tube and is guided in a pit through the trench; the liquid is transported back to the absorption tower by a sump pump to be recycled as spraying slurry. The invention avoids a U-shaped bent design appearing in the process of construction design, thereby thoroughly solving the problems of undercapacity which affects the cyclone, blockage of the system pipeline and freezing in winter.
Description
Technical field
The present invention relates to a kind of gypsum dehydration method for smoke-gas wet desulfurization, specifically is the dewatering of limestone/gypsum wet process of FGD gypsum, belongs to the flue gas desulfurization field.
Background technology
Usually, power-plant flue gas must enter desulfurizer and remove wherein sulphur before discharging.At present, the limestone/gypsum wet method fume desulfurizing system is generally adopted in flue gas desulfurization, it is included in the absorption tower and is reacted into calcium sulfate gypsum slurry with the sulphur in the Wingdale solution absorption flue gas and with the airborne oxygen that blasts in the tower, at the bottom of tower, extract calcium plaster with shurry pump out, most of circulation is returned in the tower, small portion is sent into the gypsum swirler, go into after concentrating by eddy flow the vacuum belt water trap further dewater the solid gypsum, the liquid that cyclonic separation goes out is sent into the waste-water vortex device, eddy flow is told water and slurries, and water send Waste Water Treatment to handle again.In order to reduce wastewater discharge, the aborning rarer slurries of gypsum dehydration all return the absorption tower and spray.Wherein the gypsum swirler need be provided with spill box, filtrate box and return pump accordingly, and U type bend appears in pipeline trend, and U type turn of bilge flow velocity is slow in the operational process, stops up easily and causes and be short of power; Even more serious is to freeze at a whole set of pipeline system of northern area easy appearance in winter, thereby causes dewatering system to be stopped transport.
Summary of the invention
The gypsum dehydration method that the purpose of this invention is to provide a kind of smoke-gas wet desulfurization, it can guarantee that gypsum dehydration slurries return line is unimpeded, avoids obstruction that causes because of bend or the problem that is short of power.
Method of the present invention is as follows:
The atmospheric oxygen that is also blasted in the tower with the sulphur in the lime stone slurry spray absorption flue gas in the absorption tower changes into satinite cream slurry, at the bottom of tower, extract calcium plaster with shurry pump out, major part is the liquid that backflows, small portion is sent into the gypsum swirler, a gypsum swirler top flow liquid part is the liquid that backflows, another part is sent into the waste-water vortex device, gypsum swirler underflow enriched material by the vacuum belt water trap dewater the solid gypsum; The top flow point of waste-water vortex device send Waste Water Treatment from water outlet; The calcium plaster that the underflow slurries and the said absorption tower of the filtrate of vacuum belt water trap, waste-water vortex device are extracted out liquid, the swirler top stream liquid that backflows that backflows imports header in the lump, feed trench by header, feed in the melt pit by trench, return the absorption tower recovery by the sump pump conveying and make sprayed slurry.
The advantage of dewatering of the present invention is:
Desulfurated plaster slurries in a, the absorption tower are discharged the absorption tower through the desulfurated plaster slurry pump, and wherein a part enters the plaster serum rotational flow device, and another part returns the absorption tower by melt pit after return valve enters collector tube.The phenomenon that gypsum swirler eddy flow that this technology has avoided gypsum slurries directly to return the absorption tower appearance can not all put into operation is from the problem of source solution swirler undercapacity.
B, the liquid that returns the absorption tower all are introduced into collector tube, after trench enters melt pit, are delivered to the absorption tower by sump pump.This technology merges design with the liquid that backflows of the discharging of desulphurization system uptake zone and gypsum dehydration system, the curved design of the U type of having avoided the working design process to occur, solved from the source systematic pipeline blockage problem and winter frozen problem.
C, can save gypsum swirler spill box, filtrate box and return pump accordingly, simplify Processes and apparatus, reduce cost.
The explanation of accompanying drawing example
Accompanying drawing is an overall structure synoptic diagram of the present invention.
The 1-absorption tower, 1-1-mist eliminator, 1-2-smoke inlet, 1-3-exhanst gas outlet, the 2-sump pump, 3-melt pit, 4-trench, 5-slush pump, 6-slurries output tube, 7-slurry reflux variable valve, 8-gypsum swirler, 9-vacuum belt dewaterer, the 10-header, 11-gypsum swirler top flow liquid, 12-waste water variable valve, 13-waste-water vortex device, 14-Waste Water Treatment, I, III-return tube, II-vacuum belt dewaterer filtrate pipe, VI-waste-water vortex device underflow slurry pipe, the V-house steward of backflowing.
Embodiment
Dewatering below in conjunction with description of drawings smoke-gas wet desulfurization gypsum of the present invention.
Flue gas feeds absorption tower 1 and rises from inlet 1-2, and the lime stone slurry that the sulfide that wherein contains is sprayed in the tower absorbs, and flue gas continues to rise then, separates by mist eliminator 1-1 and discharges from exhanst gas outlet 1-3 after removing water droplet.Lime stone slurry absorb sulfur in smoke generate calcium sulfite and and then be oxidised with air to gypsum (calcium sulfate), the mixed serum of desulfurated plaster and Wingdale is settled down at the bottom of the tower.
Dewatering is as follows:
Desulfurated plaster slurries in a, the absorption tower 1 are extracted out through slush pump 5, and wherein small portion variable valve 7 enters plaster serum rotational flow device 8, and major part enters header 10 by return tube I, returns absorption tower 1 through trench 4, melt pit 3 through pump 2;
Top flow point two portions of b, gypsum swirler 8, a part directly enters header 10 after trench 4, melt pit 3 return absorption tower 1 from return tube III; Another part enters waste-water vortex device 13 through waste water variable valve 12, and waste-water vortex device 13 tops flow to into Waste Water Treatment or directly enter blowdown system discharging 14, and the underflow slurries enter header 10, trench 4, melt pit 3 retrieval system towers 1 through pipe VI;
The underflow of c, gypsum swirler 8 enters vacuum belt dewaterer 9, and gypsum is sent into the gypsum stockyard and deposited, and filtrate II is returned absorption tower 1 by header 10 through melt pit 3;
All liquid that return absorption tower 1 all are introduced into the liquid concentrate tube 10 that backflows after trench 4 enters melt pit 3, are delivered to absorption tower 1 by sump pump 2.This technology merges design with the discharging of the discharging of desulphurization system uptake zone and gypsum dehydration system, the curved design of the U type of having avoided the working drawing design process to occur, solved from the source systematic pipeline blockage problem and winter frozen problem.
Claims (1)
1. gypsum dehydration method for smoke-gas wet desulfurization, in the absorption tower, change into calcium plaster with sulphur in the lime stone slurry spray absorption flue gas and the atmospheric oxygen that is blasted in the tower, extract calcium plaster with shurry pump out from the absorption tower, major part is the liquid that backflows, small portion is sent into the gypsum swirler, a flow liquid part in gypsum swirler top is the liquid that backflows, and another part is sent into the waste-water vortex device, gypsum swirler underflow enriched material through the vacuum belt water trap dewater the solid gypsum; The top stream of waste-water vortex device send Waste Water Treatment; The calcium plaster that the underflow slurries and the absorption tower of the filtrate of vacuum belt water trap, waste-water vortex device are extracted out liquid, the swirler top stream liquid that backflows that backflows imports header in the lump, feed trench by header, feed in the melt pit by trench, return the absorption tower recovery by the sump pump conveying and make sprayed slurry.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200810018954XA CN101229964A (en) | 2008-02-01 | 2008-02-01 | Gypsum dehydration method for smoke-gas wet desulfurization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200810018954XA CN101229964A (en) | 2008-02-01 | 2008-02-01 | Gypsum dehydration method for smoke-gas wet desulfurization |
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| Publication Number | Publication Date |
|---|---|
| CN101229964A true CN101229964A (en) | 2008-07-30 |
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| CNA200810018954XA Pending CN101229964A (en) | 2008-02-01 | 2008-02-01 | Gypsum dehydration method for smoke-gas wet desulfurization |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102416295A (en) * | 2011-10-19 | 2012-04-18 | 中国神华能源股份有限公司 | Flue gas desulfurization system |
| CN102489143A (en) * | 2011-12-21 | 2012-06-13 | 鞍钢集团矿业公司 | Flue-gas desulphurization system and flue-gas desulphurization method |
| CN103272466A (en) * | 2013-05-02 | 2013-09-04 | 杭州蓝轩环保科技有限公司 | Flue gas desulphurization device and desulphurization method |
| CN103351066A (en) * | 2013-07-22 | 2013-10-16 | 中国大唐集团环境技术有限公司 | Novel wet flue gas desulfurization wastewater treatment method and system |
| CN109437627A (en) * | 2018-12-26 | 2019-03-08 | 北京国电龙源环保工程有限公司 | A kind of gypsum dehydration system of simplification |
| CN110723858A (en) * | 2019-11-22 | 2020-01-24 | 北京龙源环保工程有限公司 | Desulfurization wastewater zero-discharge treatment system and treatment process |
| CN111888906A (en) * | 2020-07-27 | 2020-11-06 | 国家能源集团谏壁发电厂 | Fault emergency processing system of limestone slurry supply system |
| CN115925293A (en) * | 2023-01-09 | 2023-04-07 | 西安热工研究院有限公司 | Vacuum dehydration system for desulfurized gypsum and working method thereof |
-
2008
- 2008-02-01 CN CNA200810018954XA patent/CN101229964A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102416295A (en) * | 2011-10-19 | 2012-04-18 | 中国神华能源股份有限公司 | Flue gas desulfurization system |
| CN102489143A (en) * | 2011-12-21 | 2012-06-13 | 鞍钢集团矿业公司 | Flue-gas desulphurization system and flue-gas desulphurization method |
| CN103272466A (en) * | 2013-05-02 | 2013-09-04 | 杭州蓝轩环保科技有限公司 | Flue gas desulphurization device and desulphurization method |
| CN103272466B (en) * | 2013-05-02 | 2015-09-16 | 杭州蓝轩环保科技有限公司 | A kind of flue gas desulfur device and sulfur method |
| CN103351066A (en) * | 2013-07-22 | 2013-10-16 | 中国大唐集团环境技术有限公司 | Novel wet flue gas desulfurization wastewater treatment method and system |
| CN109437627A (en) * | 2018-12-26 | 2019-03-08 | 北京国电龙源环保工程有限公司 | A kind of gypsum dehydration system of simplification |
| CN109437627B (en) * | 2018-12-26 | 2023-12-19 | 国能龙源环保有限公司 | Simplified gypsum dewatering system |
| CN110723858A (en) * | 2019-11-22 | 2020-01-24 | 北京龙源环保工程有限公司 | Desulfurization wastewater zero-discharge treatment system and treatment process |
| CN111888906A (en) * | 2020-07-27 | 2020-11-06 | 国家能源集团谏壁发电厂 | Fault emergency processing system of limestone slurry supply system |
| CN115925293A (en) * | 2023-01-09 | 2023-04-07 | 西安热工研究院有限公司 | Vacuum dehydration system for desulfurized gypsum and working method thereof |
| CN115925293B (en) * | 2023-01-09 | 2024-09-03 | 西安热工研究院有限公司 | Vacuum dehydration system for desulfurized gypsum and working method thereof |
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Open date: 20080730 |