CN101879379A - A system and method for recycling lithium bromide to recover water from desulfurization system exhaust - Google Patents
A system and method for recycling lithium bromide to recover water from desulfurization system exhaust Download PDFInfo
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- CN101879379A CN101879379A CN 201010223991 CN201010223991A CN101879379A CN 101879379 A CN101879379 A CN 101879379A CN 201010223991 CN201010223991 CN 201010223991 CN 201010223991 A CN201010223991 A CN 201010223991A CN 101879379 A CN101879379 A CN 101879379A
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- lithium bromide
- water
- heat exchanger
- pipeline
- surface heat
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- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 title claims abstract description 80
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 72
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 30
- 230000023556 desulfurization Effects 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000004064 recycling Methods 0.000 title claims abstract 4
- 239000003546 flue gas Substances 0.000 claims abstract description 30
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 29
- 238000000605 extraction Methods 0.000 claims description 9
- 238000011084 recovery Methods 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 7
- 230000005611 electricity Effects 0.000 abstract description 3
- 230000003009 desulfurizing effect Effects 0.000 description 11
- 238000009833 condensation Methods 0.000 description 7
- 230000005494 condensation Effects 0.000 description 7
- 238000001816 cooling Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000002242 deionisation method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000005619 thermoelectricity Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Treating Waste Gases (AREA)
Abstract
一种溴化锂循环回收脱硫系统排气含水的系统及方法，在烟囱进口前段加装一表面换热器；将汽轮机低压段抽汽送入溴化锂制冷机获得冷水；将溴化锂制冷机出来的冷水送入表面换热器与烟气进行换热，使烟气中的水蒸气凝结；表面换热器上设置有收集凝结水的槽型通道。本发明对电厂中节水有重要意义。尤其对北方水资源较为缺乏的干旱地区更是如此。本方法用蒸汽直接制冷，而不是用电制冷，省去了由“汽”转换为“电”再转换为“冷”带来的损失。
A system and method for recycling lithium bromide to recover water from desulfurization system exhaust. A surface heat exchanger is installed in the front section of the chimney inlet; The surface heat exchanger exchanges heat with the flue gas to condense the water vapor in the flue gas; the surface heat exchanger is provided with a groove channel for collecting condensed water. The invention has great significance for water saving in power plants. This is especially true for arid areas in the north where water resources are relatively scarce. The method uses steam to directly refrigerate instead of using electricity to refrigerate, which saves the loss caused by converting "steam" to "electricity" and then to "cold".
Description
Technical field
The invention belongs to the energy-saving and emission-reduction field, relate to the moisture system and method for lithium bromide circulation recovery desulphurization system exhaust in a kind of large-scale power station.
Background technology
China's thermal power output accounts for national gross generation more than 80%, and the water consumption in thermal power plant is huge.Whole nation water resource communique and industry statistic show: national thermoelectricity water consumption accounts for 45% of industrial water consumption.According to statistics, the average water consumption of power plants is 3.1～3.5kg/ (kw.h), and the electrical generation water of developed country consumption is 2.52kg/ (kWh), and water consumption in power plant, South Africa only is 1.25kg/ (kWh), therefore, be still an engineering of shouldering heavy responsibilities at the power plants water-saving engineering.Especially now large thermal power plant adopts wet desulfurization system mostly, and flue gas after desulfurization carries a large amount of steam and enters flue and chimney, causes power plant's water consumption huge.The dry method desulfuration system that operating cost is higher, desulfuration efficiency is lower but can economize on water is often had to adopt in the water shortage in north china area.
Water use sector in the typical case power plant is divided into recirculating cooling water system, chemical deionization water system (boiler feed water system), lime-ash water system, industrial cooling circulating water system, life and fire fighting water system, miscellaneous water system and desulfurization water system.Thermal power plant will economize on water, and then must start with from these several respects.
Mainly contain following several water saving measures at present: (1) waste water is recycled, and realizes full factory waste water zero discharge; (2) improve the recirculated water concentration rate; (3) improvement of ash disposal system; (4) adopt air cooling technique; (5) the watermeter scale being installed also regularly monitors water quality; (6) water-steam system optimization; (7) reducing power plant effluent produces.
An important performance assessment criteria of power plant is a desulfuration efficiency now, requires to be not less than 90%.So wet desulphurization technology is efficiently adopted by increasing large power plant, the desulfurization water consumption also accounts for most of power plant's water consumption.The recovery of desulfurization water now mainly is to be undertaken by circulation in the desulfurizing tower, but through the steam in the flue gas after the wet desulphurization, the never measure of reclaiming.Flue gas after the desulfurization carries the steam more than 30%, does not discharge in the middle of the atmosphere if do not add to reclaim directly, will cause huge water resource waste.
Summary of the invention
The object of the present invention is to provide a kind of northern area that can be implemented in to adopt wet desulphurization, the moisture system and method for desulphurization system exhaust is reclaimed in the discharging of realization utmost point low water consumption, the lithium bromide circulation that desulfurization is efficient, operating cost is lower.
For achieving the above object, system of the present invention comprises desulfurizing tower and the chimney that is connected with the exhaust gases passes of boiler, in the gas approach of chimney, be furnished with surface exchanger, described surface exchanger is connected with lithium bromide refrigerator by pipeline and constitutes the closed loop, this surface exchanger is provided with the grooved passage of collecting condensate water, the inlet of described lithium bromide refrigerator is connected with the low pressure stage extraction opening of steam turbine by the road, the outlet of steam turbine and be connected with hot well by the road through the condensate water of lithium bromide refrigerator condensation.
Described flue gas is sent into desulfurizing tower through the condensed condensate water of surface exchanger by grooved passage and pipeline, and also is provided with the condensate water valve on this pipeline.
Also be provided with pressure-reducing valve on described steam turbine and the pipeline that lithium bromide refrigerator is connected.
The leaving water temperature that described and surface exchanger constitutes the lithium bromide refrigerator of closed-loop path is 6～20 ℃.
Method of the present invention is: 1) at first, the steam inlet of lithium bromide refrigerator is linked to each other with the low pressure stage extraction opening of steam turbine, the condensate water that steam forms behind lithium bromide refrigerator links to each other with hot well by the road;
2) secondly, in the gas approach of chimney, arrange and have the surface exchanger of collecting condensate water grooved passage, then surface exchanger being connected with lithium bromide refrigerator by pipeline constitutes the closed loop, and the cold water that lithium bromide refrigerator comes out is sent into surface exchanger and carried out heat exchange;
3) flue gas in the boiler enters desulfurizing tower through pipeline, enter the surface exchanger that is provided with in the chimney by the flue gas after the desulfurizing tower desulfurization, by surface exchanger flue gas is carried out condensation, condensed condensed water reclaims by heat exchanger grooved passage or directly sends into desulfurizing tower through pipeline.
The present invention can make full use of the power plant steam turbine low-pressure steam and bleed, and adopts the lithium bromide refrigerating principle to realize that the exhaust of refrigeration recovery desulphurization system is moisture.This is significant to the water saving of existing wet desulfurization system power plant, and can be implemented in northern area employing wet desulfurization system, realizes that utmost point low water consumption is discharged, desulfurization is efficient, operating cost is lower.Other water-saving methods of this programme and power plant are different, directly utilize the band water in the lithium bromide refrigerating principle recovery flue gas; Surface exchanger is increased in before the chimney in the flue, and cold working medium and flue gas carry out heat exchange in surface exchanger, and the water in the flue gas obtains through condensing reclaiming; This scheme is changed under the little prerequisite at equipment, can realize that high efficiency water resource reclaims.
Description of drawings
Fig. 1 is an overall structure schematic diagram of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail.
Referring to Fig. 1, the present invention includes the desulfurizing tower 2 and the chimney 4 that are connected with the exhaust gases passes of boiler 1, in the gas approach of chimney 4, be furnished with surface exchanger 3, described surface exchanger 3 is connected with lithium bromide refrigerator 5 by pipeline and constitutes the closed loop, the leaving water temperature of lithium bromide refrigerator 5 is 6～20 ℃, this cold water is sent into surface exchanger 3 and flue gas, and to carry out heat exchange condensation flue gas moisture, this surface exchanger 3 is provided with the grooved passage of collecting condensate water, flue gas is sent into desulfurizing tower 2 through surface exchanger 3 condensed condensate water by grooved passage and pipeline, and also is provided with condensate water valve 8 on this pipeline; The steam inlet of described lithium bromide refrigerator 5 is connected with the low pressure stage extraction opening of steam turbine 7 by the road, and on this pipeline, also be provided with pressure-reducing valve 9, utilize the extraction opening of steam turbine 7 that steam is extracted out, by pressure-reducing valve 9 steam of extracting out is reduced to lithium bromide refrigerator 5 required pressure and send into lithium bromide refrigerator 5; The outlet of steam turbine 7 and be connected with hot well 6 by the road through the condensate water of lithium bromide refrigerator 5 condensations.
Its process is:
1) at first, the steam inlet of lithium bromide refrigerator 5 is linked to each other with the low pressure stage extraction opening of steam turbine 7, the condensate water that steam forms behind lithium bromide refrigerator 5 links to each other with hot well 6 by the road;
2) secondly, in the gas approach of chimney 4, arrange and have the surface exchanger 3 of collecting condensate water grooved passage, then surface exchanger 3 is constituted the closed loop by pipeline and being connected of lithium bromide refrigerator 5, the cold water that lithium bromide refrigerator 5 comes out is sent into surface exchanger 3 and is carried out heat exchange;
3) flue gas in the boiler 1 carries out desulfurizing tower 2 through pipeline, enter the surface exchanger 3 that is provided with in the chimney 4 by the flue gas after desulfurizing tower 2 desulfurization, carry out condensation by 3 pairs of flue gases of surface exchanger, condensed condensed water reclaims by heat exchanger grooved passage or directly sends into desulfurizing tower 2 through pipeline.
Through the flue gas behind the wet desulfurization system, wherein moisture is bigger, so the recovery of moisture in the flue gas after desulfurization, and the shortage of alleviating the arid area water resource is had significance; The not electricity consumption of condensation flue gas with water, and with the low-pressure pumping steam of steam turbine, condensation efficiency height.
The present invention must not increase other extraction openings aspect extracted steam from turbine, existing extraction opening gets final product; In the native system, flue gas is a flue gas after desulfurization, can not cause corrosion to equipment;
Native system, steam 60%～80% in the recyclable flue gas.
Working medium in the surface heat exchanging organ pipe of the present invention is cold water, and pipe is outer to be flue gas.
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102239911A CN101879379B (en) | 2010-07-12 | 2010-07-12 | A system and method for recycling lithium bromide to recover water from desulfurization system exhaust |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102239911A CN101879379B (en) | 2010-07-12 | 2010-07-12 | A system and method for recycling lithium bromide to recover water from desulfurization system exhaust |
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| Publication Number | Publication Date |
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| CN101879379A true CN101879379A (en) | 2010-11-10 |
| CN101879379B CN101879379B (en) | 2012-05-23 |
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| CN2010102239911A Expired - Fee Related CN101879379B (en) | 2010-07-12 | 2010-07-12 | A system and method for recycling lithium bromide to recover water from desulfurization system exhaust |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102494349A (en) * | 2011-12-16 | 2012-06-13 | 亿恒节能科技江苏有限公司 | Blowing, dehumidifying and heating steam boiler system |
| CN102519068A (en) * | 2011-12-02 | 2012-06-27 | 西安交通大学 | Smoke water condensing and waste heat recovering device |
| CN103463832A (en) * | 2013-10-09 | 2013-12-25 | 吉首大学 | Tail gas refrigeration recycling processing device |
| CN103505901A (en) * | 2013-09-28 | 2014-01-15 | 昆山市周市溴化锂溶液厂 | Lithium bromide cycle collection based smoke exhaust and desulfurization system |
| CN103528044A (en) * | 2013-09-28 | 2014-01-22 | 昆山市周市溴化锂溶液厂 | Heat recovery system of smoke exhaust gas desulfurization device |
| CN103806964A (en) * | 2012-11-06 | 2014-05-21 | 蓝瑚科技有限公司 | Method and system for comprehensively utilizing steam turbine dead steam latent heat |
| CN105134316A (en) * | 2015-08-19 | 2015-12-09 | 安徽新宁能源科技有限公司 | Lithium bromide refrigeration and power generation system |
| CN110645587A (en) * | 2019-11-01 | 2020-01-03 | 浙江城建煤气热电设计院有限公司 | Flue gas takes off white device condensate waste heat recovery and utilizes system |
Citations (5)
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|---|---|---|---|---|
| JPH06134255A (en) * | 1992-10-22 | 1994-05-17 | Mitsubishi Heavy Ind Ltd | Wet treatment of flue gas |
| JPH0810552A (en) * | 1994-06-27 | 1996-01-16 | Chugoku Electric Power Co Inc:The | Method for dehumidifying waste gas and dehumidifier |
| CN1327871A (en) * | 2000-06-14 | 2001-12-26 | 王宇 | Wet dusting and desulfurizing process |
| CN1408464A (en) * | 2002-09-09 | 2003-04-09 | 华东理工大学 | Removing and recovering process and device for SO2 in flue gas |
| CN1435271A (en) * | 2003-02-27 | 2003-08-13 | 佛山市环境保护研究所 | Flue gas treating method |
-
2010
- 2010-07-12 CN CN2010102239911A patent/CN101879379B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06134255A (en) * | 1992-10-22 | 1994-05-17 | Mitsubishi Heavy Ind Ltd | Wet treatment of flue gas |
| JPH0810552A (en) * | 1994-06-27 | 1996-01-16 | Chugoku Electric Power Co Inc:The | Method for dehumidifying waste gas and dehumidifier |
| CN1327871A (en) * | 2000-06-14 | 2001-12-26 | 王宇 | Wet dusting and desulfurizing process |
| CN1408464A (en) * | 2002-09-09 | 2003-04-09 | 华东理工大学 | Removing and recovering process and device for SO2 in flue gas |
| CN1435271A (en) * | 2003-02-27 | 2003-08-13 | 佛山市环境保护研究所 | Flue gas treating method |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102519068A (en) * | 2011-12-02 | 2012-06-27 | 西安交通大学 | Smoke water condensing and waste heat recovering device |
| CN102519068B (en) * | 2011-12-02 | 2015-08-05 | 西安交通大学 | A kind of flue gas condensed water, waste-heat recovery device |
| CN102494349A (en) * | 2011-12-16 | 2012-06-13 | 亿恒节能科技江苏有限公司 | Blowing, dehumidifying and heating steam boiler system |
| CN103806964A (en) * | 2012-11-06 | 2014-05-21 | 蓝瑚科技有限公司 | Method and system for comprehensively utilizing steam turbine dead steam latent heat |
| CN103505901A (en) * | 2013-09-28 | 2014-01-15 | 昆山市周市溴化锂溶液厂 | Lithium bromide cycle collection based smoke exhaust and desulfurization system |
| CN103528044A (en) * | 2013-09-28 | 2014-01-22 | 昆山市周市溴化锂溶液厂 | Heat recovery system of smoke exhaust gas desulfurization device |
| CN103463832A (en) * | 2013-10-09 | 2013-12-25 | 吉首大学 | Tail gas refrigeration recycling processing device |
| CN105134316A (en) * | 2015-08-19 | 2015-12-09 | 安徽新宁能源科技有限公司 | Lithium bromide refrigeration and power generation system |
| CN110645587A (en) * | 2019-11-01 | 2020-01-03 | 浙江城建煤气热电设计院有限公司 | Flue gas takes off white device condensate waste heat recovery and utilizes system |
| CN110645587B (en) * | 2019-11-01 | 2023-11-17 | 浙江城建煤气热电设计院有限公司 | Condensate water waste heat recycling system of flue gas whitening device |
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| Publication number | Publication date |
|---|---|
| CN101879379B (en) | 2012-05-23 |
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