CN102494329A - Device for utilizing flue gas waste heat of boiler comprehensively - Google Patents

Device for utilizing flue gas waste heat of boiler comprehensively Download PDF

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Publication number
CN102494329A
CN102494329A CN2011104331103A CN201110433110A CN102494329A CN 102494329 A CN102494329 A CN 102494329A CN 2011104331103 A CN2011104331103 A CN 2011104331103A CN 201110433110 A CN201110433110 A CN 201110433110A CN 102494329 A CN102494329 A CN 102494329A
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flue gas
water
heat exchange
heat
air heater
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CN102494329B (en
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王俊杰
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POLYTRON TECHNOLOGIES Inc
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Abstract

The invention discloses a device for utilizing the flue gas waste heat of a boiler comprehensively. According to the device, condensation water or water in a heating network is used as a heat transfer medium to absorb the flue gas waste heat; one part of flue gas waste heat is used as a heat source of an air heater to heat cold air in a recycling mode, so that the temperature of the cold air is improved to prevent a preheater from being corroded at low temperature, and water temperature at an inlet of a flue gas heat exchanger is improved to prevent the heat exchanger from being corroded at the low temperature; and the residual flue gas waste heat replaces steam extraction to heat the condensation water or the water in the heating network. By the device for utilizing the flue gas waste heat of the boiler comprehensively, the waste heat in the flue gas of the boiler can be recovered and converted into the heat source for heating the condensation water or the water in the heating network; and when the air heater runs, part of waste heat is converted into the heat source of the air heater, so that the heat extraction amount of a heat regenerative system of a steam turbine is reduced, the efficiency of a unit is improved, the generated output is increased, and the coal consumption for power generation is reduced.

Description

The residual heat from boiler fume comprehensive utilization device
Technical field
The present invention relates to a kind of residual heat from boiler fume comprehensive utilization device, relate generally to residual heat from boiler fume and utilize technical field.
Background technology
The heat that fuel combustions such as coal, oil, natural gas, living beings or other heat energy are discharged passes to the water of purification through metal heated face, is heated the water of certain pressure and temperature or the heat transmission equipment of steam, is called boiler.Steam after station boiler will heat is sent to the steam turbine acting, and steam turbine passes to generator for electricity generation with energy, accomplishes conversion process of energy with this.Wherein the boiler aspect can improve boiler efficiency owing to improve the intake air temperature, and steam turbine increases reheat system and water supply heat back system improves System Turbine Relative Internal Efficiency.Heat loss due to exhaust gas is to occupy very big proportion in boiler each item heat loss; Owing to receive the restriction of air preheater cold end corrosion; Usually the exhaust gas temperature design load is higher; Utilize condensate or hot net water to absorb fume afterheat as low-temperature receiver, condensate refers to the condensate that steam turbine volume condenser comes out here, and hot net water refers to be used to winter the required hot water that heats.Because this device flue gas heat exchange device inlet water temperature is higher than air preheater cold wind temperature, thus effectively can avoid the cold end corrosion phenomenon, thus reduce exhaust gas temperature; Improve boiler efficiency; Reduce the amount of drawing gas of Steam Turbine Regenerative System, increase generated output, reduce gross coal consumption rate.
Flue gas heat exchange device inlet water temperature can not be too low, otherwise can cause the cold end corrosion of flue gas heat exchange device, is provided with recirculation pump in the present invention, and flue gas heat exchange device outlet heating back water is introduced flue gas heat exchange device inlet to improve inlet water temperature.When boiler actual motion ambient temperature is low; Cause cold end corrosion for avoiding air preheater inlet cold wind temperature to hang down; Need to drop into steam air heater heats cold air; The general mode of drawing gas that adopts heats cold wind, and water heated cold wind after the present invention used recirculation pump to quote flue gas heat exchange device outlet heating, made steam air heater institute calorific requirement replaced by fume afterheat fully.
Summary of the invention
The present invention is the residual heat from boiler fume comprehensive utilization device; Condensate or hot net water absorb smoke exhaust heat in the flue gas heat exchange device of this device; Reduce exhaust gas temperature; Self be heated, return steam turbine low-pressure heater or heat network system again after the temperature that raises, the effect of instead of part low-pressure heater and heat supply network heat exchanger is a part of thermodynamic system of steam tur.Under the constant situation of Fuel Consumption, this device will be saved the regenerative steam or the heat supply of part steam turbine and draw gas, under the constant situation of steam turbine throttle flow; Drawing gas of saving continues to do work at steam turbine; Improve unit efficiency, increase generated output, reduce gross coal consumption rate.Any position before the desulphurization system behind preheater, this device flue gas heat exchange device installation site, installation direction can horizontal arrangement or vertical the layout.This device flue gas heat exchange device is installed in original exhaust gases passes, can original flue be transformed, and increases the device actual internal area, utilizes homogenizing plate or other current-sharing modes that flue gas flow rate is averaged distribution, reduces flue gas flow rate.For preventing the wearing and tearing of this device flue gas heat exchange device, this device flue gas heat exchange device smoke inlet position can increase shoe.Because this device flue gas heat exchange device exists cold end corrosion dangerous, the serious zone of flue gas heat exchange device cold end corrosion can be selected the high material of corrosion-resistant grade for use, the available conventional material of other parts.
Apparatus of the present invention flue gas heat exchange device outlet high-temperature water; Partly or entirely can get into this device flue gas heat exchange device water side entrance through the company's of inlet case or other hybrid modes through mode and this device flue gas heat exchange device inlet water at low temperature of recirculation; Control flue gas heat exchange device inlet water temperature through the recirculation water yield, the heat exchanger entrance water temperature is avoided cold end corrosion in the raising flue gas.
Apparatus of the present invention flue gas heat exchange device outlet high-temperature water; Partly or entirely can pass through the thermal source heating cold wind of the mode of recirculation as steam air heater; Connect case or this device of other hybrid modes entering flue gas heat exchange device water side entrance with this device flue gas heat exchange device inlet water at low temperature through inlet, reduce other modes of steam air heater and heat heat.Control flue gas heat exchange device inlet water temperature and steam air heater outlet wind-warm syndrome through the recirculation water yield and the water yield of the steam air heater of flowing through.On the one hand improve the cold wind temperature and avoid the preheater cold end corrosion, improve in the flue gas heat exchanger entrance water temperature on the other hand and avoid cold end corrosion.
Description of drawings
Fig. 1 is a system schematic of the present invention.
Digitized representation is following in Fig. 1: 1. tail flue gas passage, 2. flue gas heat exchange device, 3. flue gas heat exchange device influent header, 4. steam air heater outlet water valve; 5. steam air heater, 6. steam air heater inlet water valve, 7 flue gas heat exchange device condensate outlet water valve, 8. flue gas heat exchange device condensate inlet water valve; 9. flue gas heat exchange device hot net water inlet water valve, 10. flue gas heat exchange device outlet water valve, 11. recirculation pump outlet portals, 12. recirculation pumps; 13. the recirculation pump entrance door, 14. steam turbines, 15. low-pressure heaters, 16. condensers.
The specific embodiment
Shown in figure; Condensate or hot net water return original pipeline after absorbing fume afterheat as low-temperature receiver, and the flue gas heat exchange device of this device and former having heaters can parallelly connected or series operations, with the flue gas heat exchange device instead of part heat exchanger function of drawing gas; Reduce the amount of drawing gas of extracted steam from turbine system; Improve unit efficiency, increase generated output, reduce gross coal consumption rate.
Condensate or hot net water absorb smoke exhaust heat in the flue gas heat exchange device of this device, reduce exhaust gas temperature, self are heated, return steam turbine low-pressure heater or heat network system again after the temperature that raises.Flue gas heat exchange device 2 exit portion water are introduced recirculation pump 12 through the recirculation pump entrance door 13 control water yields, introduce flue gas heat exchange device influent header 3 through the recirculation pump outlet portal 11 control water yields.Control flue gas heat exchange device inlet water temperature through the recirculation water yield, the heat exchanger entrance water temperature is avoided cold end corrosion in the raising flue gas.
When the low need of boiler operatiopn ambient temperature drop into steam air heater; Recirculation pump exit portion water is introduced steam air heater 5 through the steam air heater inlet water valve 6 control water yields serve as thermal source heating cold wind; Substitute original steam air heater heating thermal source, get into flue gas heat exchange device influent header 3 through steam air heater outlet water valve 4 behind this part water heating cold wind.Add the hot water amount through steam air heater inlet water valve 6 with steam air heater outlet water valve 4 apertures control steam air heater 5 during boiler operatiopn and regulate the cold wind heating-up temperature.

Claims (9)

1. residual heat from boiler fume comprehensive utilization device; It is characterized in that: condensate or hot net water return original pipeline after absorbing fume afterheat as low-temperature receiver; Or series operation parallelly connected with former having heaters; With the flue gas heat exchange device instead of part heat exchanger function of drawing gas, reduce the amount of drawing gas of Steam Turbine Regenerative System, condensate or hot net water absorb smoke exhaust heat in the heat exchange of heat pipe of this device; Reduce exhaust gas temperature; Self be heated, return steam turbine low-pressure heater or heat network system again after the temperature that raises, flue gas heat exchange device (2) exit portion water is introduced recirculation pump (12) through recirculation pump entrance door (13) the control water yield, introduces flue gas heat exchange device influent header (3) through recirculation pump outlet portal (11) the control water yield.Control flue gas heat exchange device inlet water temperature through the recirculation water yield, the heat exchanger entrance water temperature is avoided cold end corrosion in the raising flue gas.When the low need of boiler operatiopn ambient temperature drop into steam air heater; Recirculation pump exit portion water is introduced steam air heater (5) and served as thermal source heating cold wind through steam air heater water valve (6) the control water yield that enters the mouth; Substitute original steam air heater heating thermal source, get into flue gas heat exchange device influent header (3) through steam air heater outlet water valve (4) behind this part water heating cold wind.Add the hot water amount through steam air heater inlet water valve (6) and steam air heater outlet water valve (4) aperture control steam air heater (5) during boiler operatiopn and regulate the cold wind heating-up temperature.
2. residual heat from boiler fume comprehensive utilization device according to claim 1 is characterized in that: adopt the flue gas heat exchange device instead of part heat exchanger function of drawing gas, reduce the amount of drawing gas of extracted steam from turbine system.
3. residual heat from boiler fume comprehensive utilization device according to claim 1 is characterized in that: adopt recirculation pump exit portion water to substitute original steam air heater heating thermal source.
4. residual heat from boiler fume comprehensive utilization device according to claim 1 is characterized in that: this device can independent utility after removing recirculating system.
5. residual heat from boiler fume comprehensive utilization device according to claim 1 is characterized in that: any position before the desulphurization system behind preheater, this device flue gas heat exchange device installation site, installation direction are arranged horizontally or vertically arrange.
6. residual heat from boiler fume comprehensive utilization device according to claim 1; It is characterized in that: this device flue gas heat exchange device is installed in original exhaust gases passes; Can original flue be transformed; Increase the device actual internal area and reduce flue gas flow rate, utilize homogenizing plate or other current-sharing modes that flue gas flow rate is averaged distribution.
7. residual heat from boiler fume comprehensive utilization device according to claim 1 is characterized in that: this device flue gas heat exchange device smoke inlet position can increase shoe.
8. residual heat from boiler fume comprehensive utilization device according to claim 1 is characterized in that: this device flue gas heat exchange device heat-setting water is taken from any position of former unit condensate line according to the unit situation.
9. residual heat from boiler fume comprehensive utilization device according to claim 1; It is characterized in that: this device flue gas heat exchange device exists cold end corrosion dangerous; The high material of corrosion-resistant grade is selected in the serious zone of flue gas heat exchange device cold end corrosion for use, the available conventional material of other parts.
CN201110433110.3A 2011-12-21 2011-12-21 Device for utilizing flue gas waste heat of boiler comprehensively Active CN102494329B (en)

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CN102494329B CN102494329B (en) 2014-02-12

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102777876A (en) * 2012-07-27 2012-11-14 江苏科技大学 Exhaust gas waste heat steam producing system of marine diesel generating set
WO2014005476A1 (en) * 2012-07-06 2014-01-09 上海伏波环保设备有限公司 Flue gas waste heat recovery system for concurrent boiler
CN105423325A (en) * 2015-12-24 2016-03-23 哈尔滨锅炉厂有限责任公司 Steam cooling system for low-temperature smoke and working method
CN106642689A (en) * 2015-11-02 2017-05-10 中国石油化工股份有限公司 Heat medium heating furnace

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4244969A1 (en) * 1992-07-14 1998-04-09 Gea Luftkuehler Happel Gmbh Arrangement for using exhaust heat from boiler of coal-fired power station for preheating boiler feed water and primary air
CN2555468Y (en) * 2002-08-05 2003-06-11 涂建华 Medium heat exchanger with split-flow and hybrid temp regulation
CN101140072A (en) * 2007-10-25 2008-03-12 上海外高桥第三发电有限责任公司 Desulfurize flue gas waste heat recovery system used in fire coal electric generating set
US20090272113A1 (en) * 2004-11-29 2009-11-05 Yasuhiro Takeuchi Heat recovery equipment
CN102230615A (en) * 2011-06-20 2011-11-02 中国华能集团清洁能源技术研究院有限公司 Combined type flue gas residual heat comprehensive utilization system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4244969A1 (en) * 1992-07-14 1998-04-09 Gea Luftkuehler Happel Gmbh Arrangement for using exhaust heat from boiler of coal-fired power station for preheating boiler feed water and primary air
CN2555468Y (en) * 2002-08-05 2003-06-11 涂建华 Medium heat exchanger with split-flow and hybrid temp regulation
US20090272113A1 (en) * 2004-11-29 2009-11-05 Yasuhiro Takeuchi Heat recovery equipment
CN101140072A (en) * 2007-10-25 2008-03-12 上海外高桥第三发电有限责任公司 Desulfurize flue gas waste heat recovery system used in fire coal electric generating set
CN102230615A (en) * 2011-06-20 2011-11-02 中国华能集团清洁能源技术研究院有限公司 Combined type flue gas residual heat comprehensive utilization system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014005476A1 (en) * 2012-07-06 2014-01-09 上海伏波环保设备有限公司 Flue gas waste heat recovery system for concurrent boiler
CN102777876A (en) * 2012-07-27 2012-11-14 江苏科技大学 Exhaust gas waste heat steam producing system of marine diesel generating set
CN106642689A (en) * 2015-11-02 2017-05-10 中国石油化工股份有限公司 Heat medium heating furnace
CN105423325A (en) * 2015-12-24 2016-03-23 哈尔滨锅炉厂有限责任公司 Steam cooling system for low-temperature smoke and working method

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