CN103528044A - Heat recovery system of smoke exhaust gas desulfurization device - Google Patents
Heat recovery system of smoke exhaust gas desulfurization device Download PDFInfo
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- CN103528044A CN103528044A CN201310450834.8A CN201310450834A CN103528044A CN 103528044 A CN103528044 A CN 103528044A CN 201310450834 A CN201310450834 A CN 201310450834A CN 103528044 A CN103528044 A CN 103528044A
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- flue gas
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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Abstract
The invention discloses a heat recovery system of a smoke exhaust gas desulfurization device. The smoke exhaust gas desulfurization device comprises a desulfurizing tower (2) communicated with a smoke passage of a boiler (1), and a chimney (4), wherein a surface heat exchanger (3) is arranged between the desulfurizing tower (2) and the chimney (4), and the surface heat exchanger (3) is arranged at an inlet flue of the chimney (4). The heat recovery system is characterized in that a hot end outlet pipeline of the surface heat exchanger (3) is connected into a hot well (6) which is connected with a steam turbine (7), and the hot well (6) is connected into a high pressure section extraction opening of the steam turbine (7); a low pressure section extraction opening of the steam turbine (7) is in cascade connection with a plurality of lithium bromide units (5) respectively; a heating-up compression device (11) is arranged between adjacent lithium bromide units (5), and a condensate water outlet pipeline of the last lithium bromide unit (5) is connected into the surface heat exchanger (3) to form a closed circulation loop. By means of the heat recovery system, high-efficiency water resource recovery can be realized on the premise that equipment is not transformed greatly.
Description
Technical field
The invention belongs to energy-conservation recovery technology field, be specifically related to a kind of heat recovery system of flue gas exhaust desulfurizer.
Background technology
The appearance of steam turbine has promoted the development of power industry, and to 20 beginnings of the century, power station steam turbine single-machine capacity has reached 10 megawatts.Increasingly extensive along with electric power application, some metropolitan power station peakloads of the U.S. have approached 1000 megawatts in the twenties, if single-machine capacity only has 10 megawatts, need to install nearly hundred, therefore single-machine capacity just increases to 60 megawatts during the twenties, has occurred again the steam turbine of 165 megawatts and 208 megawatts the beginning of the thirties.After this outburst of economic recession and during World War II, makes the increase of the steam turbine single-machine capacity state that seizes up.The fifties, along with post-war economic development, electricity needs is advanced by leaps and bounds, and single-machine capacity starts again continuous increase, has occurred successively the large-size steam turbine of 325～600 megawatts; 1000 megawatt steam turbines have been made the sixties; The seventies, 1300 megawatt steam turbines have been made.The conventional single-machine capacity of present many countries is 300～600 megawatts.
Steam turbine is the external combustion rotary machinery that steam thermal energy can be converted into mechanical power, from the steam of boiler, enters after steam turbine, passes through successively nozzle and the movable vane of a series of loop configurations, the heat energy of steam is converted into the mechanical energy of turbine rotor rotation.Steam, in steam turbine, carries out power conversion by different way, has just formed the steam turbine of different operating principle.The exhaust steam pressure of steam turbine is lower, and the thermal efficiency of vapor recycle is just higher.But exhaust steam pressure mainly depends on the vacuum of condenser, vacuum depends on again the temperature of cooling water and the equipment vacuumizing, if adopt too low exhaust steam pressure, just need to increase cooling water flow, increase the heat-transfer surface of condenser cooling water and cooling medium, the temperature that reduces the cooling water being used and the equipment vacuumizing, longer exhaust stage blade, but the too low steam flow rate of steam turbine (low pressure (LP) cylinder) that can cause again of vacuum is accelerated simultaneously, make steam turbine (low pressure (LP) cylinder) differential expansion aggravation, jeopardize Turbine Safety running.For the heat energy of discharging can be used, and don't as for the too much reduction thermal efficiency, general steam turbine is to discharge 60 ℃ of upper and lower steam, the sensible heat that near steam this temperature wherein can be utilized is few, although wherein comprise a large amount of latent heat, but because latent heat is difficult to be utilized, therefore, the utilization ratio of the steam of the low-temperature heat source that steam turbine is discharged is always lower.In prior art, the exhaust steam that steam turbine is discharged is applied on one-level lithium bromide unit, after should being finished, being just discharged from and abandoning, and has wasted greatly the energy, has reduced the service efficiency of the energy.
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) electrical generation water of ，Er developed country consumption is 2.52kg/(kWh), water consumption in power plant, South Africa is only 1.25kg/(kWh), therefore, at power plants water-saving engineering, be still an engineering of shouldering heavy responsibilities.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 water shortage in north china area.
Water use sector in 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 must start with from these several respects.
Mainly contain at present following several water saving measures: (1) waste water is recycled, and realizes full factory waste water zero discharge; (2) improve recirculated water concentration rate; (3) improvement of ash disposal system; (4) adopt air cooling technique; (5) watermeter scale be installed and regularly water quality monitored; (6) water-steam system optimization; (7) reducing power plant effluent produces.
An important performance assessment criteria of power plant is desulfuration efficiency now, requires to be not less than 90%.So Wet Flue Gas Desulfurization Technique is adopted by increasing large power plant efficiently, most of desulfurization water consumption Ye Zhan power plant water consumption.The recovery of desulfurization water is mainly by looping in desulfurizing tower now, but the steam in the flue gas after wet desulphurization, the measure of never reclaiming.Flue gas after desulfurization carries more than 30% steam, if do not add to reclaim directly, does not discharge in the middle of atmosphere, will cause huge water resource waste.The present invention therefore.
Summary of the invention
The object of the invention is to provide a kind of heat recovery system of flue gas exhaust desulfurizer, well solve moisture in prior art and wasted serious problem, can realize especially at northern area and adopt wet desulphurization, realize the discharge of utmost point low water consumption, desulfurization is efficient, operating cost is lower.
In order to solve these problems of the prior art, technical scheme provided by the invention is:
A heat recovery system for flue gas exhaust desulfurizer, described flue gas exhaust desulfurizer comprises desulfurizing tower and the chimney being connected with the exhaust gases passes of boiler, between described desulfurizing tower and chimney, surface exchanger is set; Described surface exchanger is arranged in the gas approach place of chimney, and described surface exchanger hot junction export pipeline is connected into the hot well being connected with steam turbine, and described hot well is connected into the high pressure section extraction opening of steam turbine; The low pressure stage extraction opening of described steam turbine is several lithium bromide units of cascade respectively; Between adjacent lithium bromide unit, intensification compression set is set, the condensed water outlet pipeline of last lithium bromide unit is connected into formation closed loop in surface exchanger.
Preferred technical scheme is: on the pipeline that described steam turbine is connected with first lithium bromide unit, be also provided with pressure-reducing valve.
Preferred technical scheme is: the leaving water temperature that described and surface exchanger form the lithium bromide unit of closed-loop path is 6～20 ℃.
Preferred technical scheme is: the condensed water outlet pipeline of the outlet pipeline of desulfurizing tower, surface exchanger and enter between the pipeline of flue interlayer and be provided with condensate water three-way valve.
Preferred technical scheme is: on described surface exchanger, be provided with the grooved passage of collecting condensate water, described flue gas is connected into by pipeline by grooved passage and pipeline and sends in the flue interlayer arranging between desulfurizing tower and surface exchanger through the water outlet of the condensed condensate water of surface exchanger and desulfurizing tower.
Preferred technical scheme is: described intensification compression set comprises: condenser, is provided with heat-conducting liquid in described condenser; Vavuum pump, is connected with described condenser; Superheater, is connected with described condenser; Compressor, is connected with described superheater.
Preferred technical scheme is: described vavuum pump is steam-jet vacuum pump.
Preferred technical scheme is: the quantity of described lithium bromide unit is 4.
Preferred technical scheme is: described lithium bromide unit comprises: generator; Cooler, is connected with described generator; Evaporimeter, is connected with described condenser; Absorber, is all connected with described generator, described evaporimeter.
The present invention provides a kind of heat recovery method of flue gas exhaust desulphurization system in addition, it is characterized in that:
1) first, the steam inlet of lithium bromide unit is connected with the low pressure stage extraction opening of steam turbine, the condensate water that steam forms after lithium bromide unit is connected with hot well by the road;
2) secondly, in the gas approach of chimney, arrange with the surface exchanger of collecting condensate water grooved passage, then surface exchanger is connected with steam turbine, lithium bromide unit respectively and is formed closed loop by pipeline, lithium bromide unit cold water is out sent into surface exchanger and is carried out heat exchange;
3) flue gas in boiler enters desulfurizing tower through pipeline, flue gas after desulfurizing tower desulfurization enters the surface exchanger arranging in chimney, by surface exchanger, flue gas is carried out to condensation, condensed condensed water is by the recovery of heat exchanger grooved passage or in pipeline is directly sent into the flue interlayer between desulfurizing tower and surface exchanger.
Preferred technical scheme is: the condensed water outlet pipeline of the outlet pipeline of desulfurizing tower, surface exchanger and enter between the pipeline of flue interlayer and be provided with condensate water three-way valve.
Preferred technical scheme is: the leaving water temperature that described and surface exchanger form the lithium bromide unit of closed-loop path is 6～20 ℃.
The present invention can make full use of power plant steam turbine low-pressure steam and bleed, and adopts lithium bromide refrigerating principle to realize the exhaust of refrigeration recovery desulphurization system moisture.The present invention is in order to reduce the impact of the flue gas effects on surface heat exchanger of high heat, in flue interlayer before surface exchanger, be filled with condensed water, can carry out flue gas cooling in advance, this is significant to having the water saving of wet desulfurization system power plant, and can realize at northern area and adopt wet desulfurization system, realize the discharge of utmost point low water consumption, 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 lithium bromide refrigerating principle recovered flue gas; Surface exchanger is increased in before chimney in flue, and cold working medium and flue gas carry out heat exchange in surface exchanger, and the water in flue gas is recycled through condensing; This scheme is changed under little prerequisite at equipment, can realize high efficiency water resource and reclaim.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, be specifically described:
Fig. 1 is the overall structure schematic diagram of the heat recovery system of flue gas exhaust desulfurizer of the present invention.
The specific embodiment
Below in conjunction with specific embodiment, such scheme is described further.Should be understood that these embodiment are not limited to limit the scope of the invention for the present invention is described.The implementation condition adopting in embodiment can be done further adjustment according to the condition of concrete producer, and not marked implementation condition is generally the condition in normal experiment.
Embodiment
As shown in Figure 1, the heat recovery system of this flue gas exhaust desulfurizer, described flue gas exhaust desulfurizer comprises desulfurizing tower 2 and the chimney 4 being connected with the exhaust gases passes of boiler 1,4, described desulfurizing tower 2 and chimney arrange surface exchanger 3; Described surface exchanger 3 is arranged in the gas approach place of chimney 4, and described surface exchanger 3 hot junction export pipelines are connected into the hot well 6 being connected with steam turbine 7, and described hot well 6 is connected into the high pressure section extraction opening of steam turbine 7; The low pressure stage extraction opening of described steam turbine 7 is several lithium bromide units 5 of cascade respectively; 5 of adjacent lithium bromide units arrange intensification compression set 11, and the condensed water outlet pipeline of last lithium bromide unit 5 is connected into the interior formation of surface exchanger 3 closed loop.
On the pipeline that described steam turbine 7 is connected with first lithium bromide unit 5, be also provided with pressure-reducing valve 9.The described leaving water temperature that forms the lithium bromide units 5 of closed-loop paths with surface exchanger 3 is 6～20 ℃.The condensed water outlet pipeline of the outlet pipeline of desulfurizing tower 2, surface exchanger 3 and enter between the pipeline of flue interlayer 10 and be provided with condensate water three-way valve 8.
On described surface exchanger 3, be provided with the grooved passage of collecting condensate water, described flue gas is connected into by pipeline in the flue interlayer 10 of sending into desulfurizing tower 2 and 3 settings of surface exchanger by grooved passage and pipeline through the water outlet of the condensed condensate water of surface exchanger 3 and desulfurizing tower 2.
Described intensification compression set 11 comprises: condenser, vavuum pump, superheater and compressor, be provided with heat-conducting liquid in described condenser; Described vavuum pump is connected with described condenser; Described superheater is connected with described condenser; Described compressor is connected with described superheater.Described vavuum pump is steam-jet vacuum pump.The quantity of described lithium bromide unit is 4.Described lithium bromide unit 5 comprises: generator, cooler, evaporimeter and absorber, and described cooler is connected with described generator; Described evaporimeter is connected with described cooler; Described absorber is connected with described evaporimeter with described generator respectively.
Its process is:
1) first, the steam inlet of lithium bromide unit 5 is connected with the low pressure stage extraction opening of steam turbine 7, the condensate water that steam forms after lithium bromide unit 5 is connected with hot well 6 by the road;
2) secondly, in the gas approach of chimney 4, arrange with the surface exchanger 3 of collecting condensate water grooved passage, then surface exchanger 3 is formed to closed loop with steam turbine 7, lithium bromide unit 5, being connected of intensification compression set 11 respectively by pipeline, lithium bromide unit 5 cold water is out sent into surface exchanger 3 and is carried out heat exchange;
3) flue gas in boiler 1 enters desulfurizing tower 2 through pipeline, flue gas after desulfurizing tower 2 desulfurization enters the surface exchanger 3 arranging in chimney 4, by 3 pairs of flue gases of surface exchanger, carry out condensation, condensed condensed water is reclaimed or is directly sent into desulfurizing tower 2 through pipeline by heat exchanger grooved passage.
Flue gas after wet desulfurization system, wherein moisture is larger, so the recovery of moisture in flue gas after desulfurization, to alleviating the shortage important in inhibiting of Water Resources In Arid Regions; 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; In native system, flue gas is flue gas after desulfurization, can not cause corrosion to equipment.
Native system, in recyclable flue gas, steam 60%～80%.
Working medium in surface heat exchanging organ pipe of the present invention is cold water, and pipe is outer is flue gas.Owing to adopting cascade lithium bromide unit, and in every grade of lithium bromide unit, all add an intensification compression set, thereby can realize multistage lithium bromide unit, worked together, with less energy resource consumption, improved the service efficiency of thermal source.
Above-mentioned example is only explanation technical conceive of the present invention and feature, and its object is to allow person skilled in the art can understand content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalent transformations that Spirit Essence is done according to the present invention or modification, within all should being encompassed in protection scope of the present invention.
Claims (9)
1. the heat recovery system of a flue gas exhaust desulfurizer, described flue gas exhaust desulfurizer comprises desulfurizing tower (2) and the chimney (4) being connected with the exhaust gases passes of boiler (1), between described desulfurizing tower (2) and chimney (4), surface exchanger (3) is set; Described surface exchanger (3) is arranged in the gas approach place of chimney (4), it is characterized in that described surface exchanger (3) hot junction export pipeline is connected into the hot well (6) being connected with steam turbine (7), described hot well (6) is connected into the high pressure section extraction opening of steam turbine (7); The low pressure stage extraction opening of described steam turbine (7) is several lithium bromide units (5) of cascade respectively; Intensification compression set (11) is set between adjacent lithium bromide unit (5), and the condensed water outlet pipeline of last lithium bromide unit (5) is connected into formation closed loop in surface exchanger (3).
2. the heat recovery system of flue gas exhaust desulfurizer according to claim 1, is also provided with pressure-reducing valve (9) on the pipeline that the steam turbine (7) described in it is characterized in that is connected with first lithium bromide unit (5).
3. the heat recovery system of flue gas exhaust desulfurizer according to claim 1, is characterized in that the leaving water temperature that described and surface exchanger (3) form the lithium bromide unit (5) of closed-loop path is 6～20 ℃.
4. the heat recovery system of flue gas exhaust desulfurizer according to claim 1, is characterized in that the outlet pipeline of desulfurizing tower (2), the condensed water outlet pipeline of surface exchanger (3) and enter between the pipeline of flue interlayer (10) and be provided with condensate water three-way valve (8).
5. the heat recovery system of flue gas exhaust desulfurizer according to claim 1, it is characterized in that being provided with the grooved passage of collecting condensate water on described surface exchanger (3), described flue gas is connected into by pipeline in the flue interlayer (10) of sending into setting between desulfurizing tower (2) and surface exchanger (3) by grooved passage and pipeline through the water outlet of the condensed condensate water of surface exchanger (3) and desulfurizing tower (2).
6. the heat recovery system of flue gas exhaust desulfurizer according to claim 1, is characterized in that described intensification compression set (11) comprising: condenser, vavuum pump, superheater and compressor, be provided with heat-conducting liquid in described condenser; Described vavuum pump is connected with described condenser; Described superheater is connected with described condenser; Described compressor is connected with described superheater.
7. the heat recovery system of flue gas exhaust desulfurizer according to claim 6, is characterized in that described vavuum pump is steam-jet vacuum pump.
8. the heat recovery system of flue gas exhaust desulfurizer according to claim 1, the quantity that it is characterized in that described lithium bromide unit (5) is 4.
9. the heat recovery system of flue gas exhaust desulfurizer according to claim 1, is characterized in that described lithium bromide unit comprises: generator, cooler, evaporimeter and absorber, and described cooler is connected with described generator; Described evaporimeter is connected with described cooler; Described absorber is connected with described evaporimeter with described generator respectively.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104832939A (en) * | 2015-04-28 | 2015-08-12 | 杭州华电能源工程有限公司 | System and method for recovering water of smoke based on fluorine plastic heat exchanger |
| CN106440465A (en) * | 2016-08-31 | 2017-02-22 | 浙江浙能节能科技有限公司 | Energy-saving type thermal power plant flue gas moisture recovering system |
| CN107238227A (en) * | 2017-06-21 | 2017-10-10 | 燕山大学 | A kind of fume afterheat depth recovery system based on Absorption heat-transformer |
| CN107543194A (en) * | 2017-10-19 | 2018-01-05 | 淄博瑞能热电科技有限公司 | Deep condensation dust removal mist residual neat recovering system |
| CN109432935A (en) * | 2018-11-01 | 2019-03-08 | 中石化炼化工程（集团）股份有限公司 | A kind of system that depth eliminates wet desulfurization flue gas white cigarette |
| CN111520208A (en) * | 2020-04-29 | 2020-08-11 | 华能国际电力股份有限公司 | System and method for recovering flue gas waste heat and moisture by desulfurization slurry flash evaporation |
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| CN102444900A (en) * | 2011-11-30 | 2012-05-09 | 辽宁赛沃斯节能技术有限公司 | Coal power plant controllable type heat pipe flue gas waste heat recovery system and method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104832939A (en) * | 2015-04-28 | 2015-08-12 | 杭州华电能源工程有限公司 | System and method for recovering water of smoke based on fluorine plastic heat exchanger |
| CN106440465A (en) * | 2016-08-31 | 2017-02-22 | 浙江浙能节能科技有限公司 | Energy-saving type thermal power plant flue gas moisture recovering system |
| CN107238227A (en) * | 2017-06-21 | 2017-10-10 | 燕山大学 | A kind of fume afterheat depth recovery system based on Absorption heat-transformer |
| CN107543194A (en) * | 2017-10-19 | 2018-01-05 | 淄博瑞能热电科技有限公司 | Deep condensation dust removal mist residual neat recovering system |
| CN109432935A (en) * | 2018-11-01 | 2019-03-08 | 中石化炼化工程（集团）股份有限公司 | A kind of system that depth eliminates wet desulfurization flue gas white cigarette |
| CN109432935B (en) * | 2018-11-01 | 2021-04-27 | 中石化炼化工程（集团）股份有限公司 | System for deeply eliminating white smoke of wet desulphurization flue gas |
| CN111520208A (en) * | 2020-04-29 | 2020-08-11 | 华能国际电力股份有限公司 | System and method for recovering flue gas waste heat and moisture by desulfurization slurry flash evaporation |
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Application publication date: 20140122 |