CN101879379B - Gas exhausting and water containing system and method for lithium bromide recycling desulfurization system - Google Patents

Gas exhausting and water containing system and method for lithium bromide recycling desulfurization system Download PDF

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Publication number
CN101879379B
CN101879379B CN2010102239911A CN201010223991A CN101879379B CN 101879379 B CN101879379 B CN 101879379B CN 2010102239911 A CN2010102239911 A CN 2010102239911A CN 201010223991 A CN201010223991 A CN 201010223991A CN 101879379 B CN101879379 B CN 101879379B
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China
Prior art keywords
lithium bromide
exchanger
water
pipeline
bromide refrigerator
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Expired - Fee Related
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CN2010102239911A
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Chinese (zh)
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CN101879379A (en
Inventor
谭厚章
司纪朋
王学斌
牛艳青
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Xian Jiaotong University
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Xian Jiaotong University
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Abstract

The invention relates to a gas exhausting and water containing system and a gas exhausting and water containing method for a lithium bromide recycling desulfurization system. The front section of the inlet of a chimney is provided with a surface heat exchanger; steam extracted from the low-pressure section of a steam turbine is delivered into a lithium bromide refrigerator to produce cold water; the cold water produced by the lithium bromide refrigerator is delivered into the surface heat exchanger to exchange heat with flue gas, so that water vapor in the flue gas is condensed; and the surface heat exchanger is provided with a groove-shaped passage for collecting condensed water. The system and the method have a great significance for water conservation in power plants, particularly northern arid regions lacking water resources. In the method, refrigeration is directly performed by using steam not electricity, so that loss caused by the transformation of steam to electricity to coldness is eliminated.

Description

The moisture system and method for desulphurization system exhaust is reclaimed in a kind of lithium bromide circulation
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 is merely 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 gets into 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 kinds of 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 carry out through circulation in the desulfurizing tower, but through the steam in the flue gas after the wet desulphurization, the measure of never 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 through pipeline and constitutes the closed loop; This surface exchanger is provided with the grooved passage of collecting condensate, and 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 of lithium bromide refrigerator condensation.
Described flue gas is sent into desulfurizing tower through the condensed condensate of surface exchanger through grooved passage and pipeline, and on this pipeline, also is provided with the condensate valve.
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 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 grooved passage; Then surface exchanger being connected with lithium bromide refrigerator through 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 gets into desulfurizing tower through pipeline; Get into 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 through 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 lithium bromide refrigerating principle to reclaim the band water in the 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 sketch map of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is done further explain.
Referring to Fig. 1; The present invention includes the desulfurizing tower 2 and 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 through pipeline and constitutes the closed loop, and 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, and flue gas is sent into desulfurizing tower 2 through surface exchanger 3 condensed condensate through grooved passage and pipeline, and on this pipeline, also is provided with condensate valve 8; 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, through 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 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 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 grooved passage; Then surface exchanger 3 is constituted the closed loop through 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; Get into 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 through 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 is high.
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 (4)

1. a lithium bromide circulates and reclaims the exhaust aqueous system of desulphurization system; Comprise the desulfurizing tower (2) and the chimney (4) that are connected with the exhaust gases passes of boiler (1); It is characterized in that: in the gas approach of chimney (4), be furnished with surface exchanger (3); Described surface exchanger (3) is connected with lithium bromide refrigerator (5) through pipeline and constitutes the closed loop; This surface exchanger (3) is provided with the grooved passage of collecting condensate, and the inlet of described lithium bromide refrigerator (5) is connected with the low pressure stage extraction opening of steam turbine (7) by the road, the outlet of steam turbine (7) and be connected with hot well (6) by the road through the condensate of lithium bromide refrigerator (5) condensation; Described flue gas is sent into desulfurizing tower (2) through the condensed condensate of surface exchanger (3) through grooved passage and pipeline, and on this pipeline, also is provided with condensate valve (8).
2. the exhaust aqueous system of desulphurization system is reclaimed in lithium bromide according to claim 1 circulation, it is characterized in that: also be provided with pressure-reducing valve (9) on described steam turbine (7) and the pipeline that lithium bromide refrigerator (5) is connected.
3. the exhaust aqueous system of desulphurization system is reclaimed in lithium bromide circulation according to claim 1, it is characterized in that: the leaving water temperature that described and surface exchanger (3) constitutes the lithium bromide refrigerator (5) of closed-loop path is 6~20 ℃.
4. a lithium bromide circulates and reclaims the exhaust aqueous methods of desulphurization system, it is characterized in that:
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 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 grooved passage; Then surface exchanger (3) being connected with lithium bromide refrigerator (5) through pipeline constitutes the closed loop, and the cold water that lithium bromide refrigerator (5) comes out is sent into surface exchanger (3) and carried out heat exchange;
3) flue gas in the boiler (1) gets into desulfurizing tower (2) through pipeline; Get into the surface exchanger (3) that is provided with in the chimney (4) by the flue gas after desulfurizing tower (2) desulfurization; By surface exchanger (3) flue gas is carried out condensation, condensed condensed water reclaims through heat exchanger grooved passage or directly sends into desulfurizing tower (2) through pipeline.
CN2010102239911A 2010-07-12 2010-07-12 Gas exhausting and water containing system and method for lithium bromide recycling desulfurization system Expired - Fee Related CN101879379B (en)

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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
CN102494349B (en) * 2011-12-16 2013-09-04 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
CN103463832B (en) * 2013-10-09 2016-03-30 吉首大学 The freezing recycling and processing device of tail gas
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

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JP3029928B2 (en) * 1992-10-22 2000-04-10 三菱重工業株式会社 Wet flue gas treatment method
JP2698967B2 (en) * 1994-06-27 1998-01-19 中国電力株式会社 Exhaust gas dehumidification method and dehumidifier
CN1327871A (en) * 2000-06-14 2001-12-26 王宇 Wet dusting and desulfurizing process
CN1178735C (en) * 2002-09-09 2004-12-08 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

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