CN101900347A - System for high-grade recycling waste heat of smoke discharged from boiler of power station - Google Patents

System for high-grade recycling waste heat of smoke discharged from boiler of power station Download PDF

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Publication number
CN101900347A
CN101900347A CN201010242930XA CN201010242930A CN101900347A CN 101900347 A CN101900347 A CN 101900347A CN 201010242930X A CN201010242930X A CN 201010242930XA CN 201010242930 A CN201010242930 A CN 201010242930A CN 101900347 A CN101900347 A CN 101900347A
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China
Prior art keywords
waste heat
air
heat exchanger
communicated
smoke
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CN201010242930XA
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CN101900347B (en
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黄新源
马阳
刘金庭
姜培鹏
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SHANDONG HONGAO ELECTRIC POWER TECHNOLOGY Co Ltd
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SHANDONG HONGAO ELECTRIC POWER TECHNOLOGY Co Ltd
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Priority to CN201010242930XA priority Critical patent/CN101900347B/en
Publication of CN101900347A publication Critical patent/CN101900347A/en
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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
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

Abstract

The invention discloses a system for high-grade recycling waste heat of smoke discharged from a boiler of a power station, belonging to the technical field of energy saving. A secondary heat exchanger for smoke waste heat recovery and a primary heat exchanger for smoke waste heat recovery are installed on a flue is sequence along the moving direction of smoke, a primary heat exchanger for air preheating is installed on a connecting duct between an air blower and an air preheater, and the primary heat exchanger for air preheating, the primary heat exchanger for smoke waste heat recovery and a primary circulating water pump form a closed water circulation loop. In the system, the smoke temperature at an outlet of the air preheater is increased by increasing the air temperature at an inlet of the air preheater, and higher smoke waster heat recovery temperature can be obtained; the waste heat can be used for heating feed water, and the high-grade recycling of the smoke waste heat can be realized.

Description

Station boiler smoke discharging residual heat high-grade recycling system
(1) technical field
The invention belongs to field of energy-saving technology, particularly a kind of station boiler waste heat high-grade recycling system.
(2) background technology
The best flue-gas temperature of station boiler sweetening process is at 80～90 ℃, but because a variety of causes, the station boiler exhaust gas temperature is at 120～150 ℃ at present, can't further reduce, so the station boiler smoke evacuation will seek out desulfurized effect preferably, flue gas will be lowered the temperature before advancing desulphurization system, promptly there is the higher energy loss of a large amount of grades in this mode, has also increased auxiliary power consumption.
Contain heat energy in the flue gas about how reclaiming, existing at present ripe flue gas waste heat recovery heat exchanger is just utilizing aspect the fume afterheat, unsatisfactory.About how utilizing after this part waste heat recovery in the boiler exhaust gas, a plurality of patents all have narration, but all be to be used to heat condenser condensed water after the boiler exhaust gas waste heat recovery or to be used for external heat supply, for example patent 200910014905.3 disclosed a kind of systems that utilize are used to the boiler exhaust gas waste heat to heat condenser condensed water exactly and are used for external heat supply.
Because the acting ability that low-pressure heater is bled is very low, fume afterheat replaces the part low-pressure heater and bleeds after the mode of heat-setting water enters thermodynamic system of steam tur, overwhelming majority energy will be lost in the environment in cold deep loss mode, and comprehensive utilization ratio is lower.For this mode of external heat supply, be subjected to the restriction of thermic load and heating parameter, be difficult to find appropriate thermal user and thermic load stable throughout the year, lasting.
(3) summary of the invention
The present invention provides a kind of fume afterheat that makes full use of in order to remedy the deficiencies in the prior art, the station boiler smoke discharging residual heat high-grade recycling system of energy-saving and emission-reduction.
The present invention is achieved through the following technical solutions:
A kind of station boiler waste heat high-grade recycling system, comprise air preheater that is communicated with boiler flue gas outlet and the air-blaster that is communicated with air preheater, the exhanst gas outlet of air preheater is communicated with chimney by flue, it is characterized in that: by the flue gas trend flue gas waste heat recovery secondary heat exchange device and heat exchanger of flue gas waste heat recovery are installed successively on the described flue, heat exchanger of air preheat is installed, heat exchanger of air preheat on the connecting pipe of air-blaster and air preheater, heat exchanger of flue gas waste heat recovery and a water circulating pump are formed a sealing water circulation road.
The present invention plan as a whole in the whole boiler of thermal power plant, the turbine system thermal energy transfer, utilize process, flue-gas temperature is dropped to below 90 ℃, and the temperature of recovery waste heat is brought up to more than 150 ℃, it is used as the heat exchange energy.
Waste heat recovery form of the present invention has two kinds:
A kind of is that steam type reclaims, and the water inlet of flue gas waste heat recovery secondary heat exchange device is communicated with the drain port of high-pressure heater, and its steam (vapor) outlet is communicated with the import of bleeding of oxygen-eliminating device;
Another kind is that hot-water type reclaims, and the water inlet of fume afterheat secondary heat exchange device is communicated with the feed pump delivery port, and its delivery port is communicated with the high-pressure heater delivery port.
Above-mentioned dual mode is used to replace the part oxygen-eliminating device with the waste heat that reclaims bleeds, or replaces the part high-pressure heater and bleed, and comes heated feed water, even can suitably improve the air preheater air exit temp, further improves boiler efficiency.
The present invention provides the air preheater exit gas temperature by improving air preheater intake air temperature, thereby obtains higher flue gas waste heat recovery temperature, accomplishes the recycling of fume afterheat high-grade.
(4) description of drawings
The present invention is further illustrated below in conjunction with accompanying drawing.
The system schematic that Fig. 1 reclaims for steam type of the present invention;
The system schematic that Fig. 2 reclaims for hot-water type of the present invention.
Among the figure, 1 air preheater, 2 air-blasters, 3 flues, 4 chimneys, 5 flue gas waste heat recovery secondary heat exchange devices, heat exchanger of 6 flue gas waste heat recoveries, heat exchanger of 7 air preheats, No. 8 water circulating pumps, 9 high-pressure heaters, 10 oxygen-eliminating devices, 11 feed pumps, 12 boilers.
(5) specific embodiment
Accompanying drawing is a kind of specific embodiment of the present invention.This embodiment comprises air preheater 1 that is communicated with boiler 12 exhanst gas outlets and the air-blaster 2 that is communicated with air preheater 1, the exhanst gas outlet of air preheater 1 is communicated with chimney 4 by flue 3, by the flue gas trend flue gas waste heat recovery secondary heat exchange device 5 and heat exchanger 6 of flue gas waste heat recovery are installed successively on the described flue 3, on the connecting pipe of air-blaster 2 and air preheater 1 heat exchanger 7 of air preheat is installed, heat exchanger 7 of air preheat, heat exchanger 6 of flue gas waste heat recovery and 8 one-tenth one sealing of water circulating pump group water circulation road.
Heat exchanger 7 of air preheater, primary side water circulating pump 8, heat exchanger of flue gas waste heat recovery 6 are formed a sealing water circulation road.Heat exchanger 6 of flue gas waste heat recovery is reduced to flue-gas temperature below 90 ℃, and obtains the hot water of proper temperature, under the effect of side water circulating pump 8 successively, hot water is delivered to heat exchanger 7 of air preheat then, and heating enters the air before the air preheater 1.Raise the also corresponding lifting of the exhanst gas outlet temperature of air preheater 1 owing to enter the air themperature of air preheater 1.Flue gas waste heat recovery secondary heat exchange device 5 fume side temperature can improve greatly thus.
Flue gas waste heat recovery secondary heat exchange device 5 heating high-pressure heaters 9 are hydrophobic, and produce the above steam of 0.5MPa, supply with oxygen-eliminating device 10 and utilize, and replace part oxygen-eliminating device 10 and bleed, thereby obtain energy-saving effect.
In addition, but also heated feed water pump 11 exit portion feedwater of flue gas waste heat recovery secondary heat exchange device 5 returns the feedwater of temperature rise to the reasonable temperature to high-pressure heater 9 exits then.Reduce owing to enter the feedwater of high-pressure heater 9, high-pressure heater 9 is bled and also can correspondingly be reduced, thereby obtains energy-saving effect.

Claims (3)

1. station boiler waste heat high-grade recycling system, comprise air preheater (1) that is communicated with boiler (12) exhanst gas outlet and the air-blaster (2) that is communicated with air preheater (1), the exhanst gas outlet of air preheater (1) is communicated with chimney (4) by flue (3), it is characterized in that: described flue (3) is gone up by the flue gas trend flue gas waste heat recovery secondary heat exchange device (5) and a heat exchanger of flue gas waste heat recovery (6) is installed successively, a heat exchanger of air preheat (7) is installed, a heat exchanger of air preheat (7) on the connecting pipe of air-blaster (2) and air preheater (1), a heat exchanger of flue gas waste heat recovery (6) and a water circulating pump (8) are formed a sealing water circulation road.
2. station boiler waste heat high-grade recycling system according to claim 1, it is characterized in that: the water inlet of described flue gas waste heat recovery secondary heat exchange device (5) is communicated with the drain port of high-pressure heater (9), and its steam (vapor) outlet is communicated with the import of bleeding of oxygen-eliminating device (10).
3. station boiler waste heat high-grade recycling system according to claim 1, it is characterized in that: the water inlet of described fume afterheat secondary heat exchange device (5) is communicated with feed pump (11) delivery port, and its delivery port is communicated with high-pressure heater (9) delivery port.
CN201010242930XA 2010-08-03 2010-08-03 System for high-grade recycling waste heat of smoke discharged from boiler of power station Active CN101900347B (en)

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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102183007A (en) * 2011-04-11 2011-09-14 广西志远节能环保设备有限公司 Waste heat recovering system of boiler
CN102330967A (en) * 2011-10-24 2012-01-25 中国电力工程顾问集团华东电力设计院 Flue gas energy cascade utilization system
CN102537997A (en) * 2012-02-17 2012-07-04 燕守志 Isentropic air heat exchanger of boiler
CN102607011A (en) * 2012-03-22 2012-07-25 济南达能动力技术有限责任公司 Multi-stage utilization system for transferring exhaust afterheat energy of power station boiler
CN102913897A (en) * 2011-08-05 2013-02-06 上海金布梯环保科技发展有限公司 Tail gas treatment device
CN103032867A (en) * 2011-05-19 2013-04-10 中国电力工程顾问集团华东电力设计院 Multilevel efficient replaceable type smoke waste heat using system
CN103471083A (en) * 2013-10-10 2013-12-25 中兴能源（唐山）节能有限公司 Boiler exhaust smoke waste heat utilization system and control method thereof
CN104930496A (en) * 2015-06-06 2015-09-23 山东泓奥电力科技有限公司 Combined air supply heating depth waste heat recycling system of low-low-temperature economizer of coal-fired unit
CN105650620A (en) * 2016-03-17 2016-06-08 马维珍 Layer-burning boiler flue gas recirculation free of recirculation fan drive and regulation control system of flue gas recirculation
CN106439780A (en) * 2015-08-10 2017-02-22 江苏海德节能科技有限公司 Novel boiler flue gas waste heat recovery system
CN106439781A (en) * 2015-08-10 2017-02-22 江苏海德节能科技有限公司 Combined boiler smoke waste heat recycling system
CN106439782A (en) * 2015-08-10 2017-02-22 江苏海德节能科技有限公司 Novel combined boiler smoke waste heat recycling system
CN106439878A (en) * 2016-05-17 2017-02-22 山东泓奥电力科技有限公司 Flue gas waste heat utilizing system of condensed water heating boiler for air supply
RU2620619C1 (en) * 2016-04-20 2017-05-29 федеральное государственное бюджетное образовательное учреждение высшего образования "Самарский государственный технический университет" Work method of boiler plant
CN110925744A (en) * 2019-12-11 2020-03-27 中国能源建设集团广东省电力设计研究院有限公司 System for recycling bypass flue gas heat from heat conducting oil of cold flue gas recirculation unit and control method
CN110925745A (en) * 2019-12-11 2020-03-27 中国能源建设集团广东省电力设计研究院有限公司 Novel efficiency improving system of cold smoke recycling unit and control method

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CN2417388Y (en) * 2000-05-12 2001-01-31 上海华力燃烧设备有限公司 Non low temp. corrosion type air preheater
CN201251371Y (en) * 2008-10-17 2009-06-03 华润电力投资有限公司 Flue gas pre-cooling system with highly-effective water and energy conservation
CN101709879A (en) * 2009-09-27 2010-05-19 西安交通大学 System for deep cooling and waste heat recovery of smoke gas in boiler
CN101737766A (en) * 2010-01-22 2010-06-16 西安热工研究院有限公司 Coal-water boiler exhaust gas residual heat recovery device
CN201779684U (en) * 2010-08-03 2011-03-30 山东泓奥电力科技有限公司 High-grade recycling system for exhaust heat of power station boiler

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2417388Y (en) * 2000-05-12 2001-01-31 上海华力燃烧设备有限公司 Non low temp. corrosion type air preheater
CN201251371Y (en) * 2008-10-17 2009-06-03 华润电力投资有限公司 Flue gas pre-cooling system with highly-effective water and energy conservation
CN101709879A (en) * 2009-09-27 2010-05-19 西安交通大学 System for deep cooling and waste heat recovery of smoke gas in boiler
CN101737766A (en) * 2010-01-22 2010-06-16 西安热工研究院有限公司 Coal-water boiler exhaust gas residual heat recovery device
CN201779684U (en) * 2010-08-03 2011-03-30 山东泓奥电力科技有限公司 High-grade recycling system for exhaust heat of power station boiler

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102183007A (en) * 2011-04-11 2011-09-14 广西志远节能环保设备有限公司 Waste heat recovering system of boiler
CN103032867A (en) * 2011-05-19 2013-04-10 中国电力工程顾问集团华东电力设计院 Multilevel efficient replaceable type smoke waste heat using system
CN102913897A (en) * 2011-08-05 2013-02-06 上海金布梯环保科技发展有限公司 Tail gas treatment device
CN102330967A (en) * 2011-10-24 2012-01-25 中国电力工程顾问集团华东电力设计院 Flue gas energy cascade utilization system
CN102537997A (en) * 2012-02-17 2012-07-04 燕守志 Isentropic air heat exchanger of boiler
CN102607011A (en) * 2012-03-22 2012-07-25 济南达能动力技术有限责任公司 Multi-stage utilization system for transferring exhaust afterheat energy of power station boiler
CN103471083A (en) * 2013-10-10 2013-12-25 中兴能源（唐山）节能有限公司 Boiler exhaust smoke waste heat utilization system and control method thereof
CN103471083B (en) * 2013-10-10 2015-06-17 中兴能源（唐山）节能有限公司 Boiler exhaust smoke waste heat utilization system and control method thereof
CN104930496A (en) * 2015-06-06 2015-09-23 山东泓奥电力科技有限公司 Combined air supply heating depth waste heat recycling system of low-low-temperature economizer of coal-fired unit
CN106439780A (en) * 2015-08-10 2017-02-22 江苏海德节能科技有限公司 Novel boiler flue gas waste heat recovery system
CN106439781A (en) * 2015-08-10 2017-02-22 江苏海德节能科技有限公司 Combined boiler smoke waste heat recycling system
CN106439782A (en) * 2015-08-10 2017-02-22 江苏海德节能科技有限公司 Novel combined boiler smoke waste heat recycling system
CN106439781B (en) * 2015-08-10 2019-05-28 江苏海德节能科技有限公司 A kind of composite boiler flue gas waste heat recovery system
CN106439780B (en) * 2015-08-10 2019-05-28 江苏海德节能科技有限公司 A kind of New-type boiler flue gas waste heat recovery system
CN106439782B (en) * 2015-08-10 2019-05-28 江苏海德节能科技有限公司 A kind of composite boiler flue gas waste heat recovery system
CN105650620A (en) * 2016-03-17 2016-06-08 马维珍 Layer-burning boiler flue gas recirculation free of recirculation fan drive and regulation control system of flue gas recirculation
RU2620619C1 (en) * 2016-04-20 2017-05-29 федеральное государственное бюджетное образовательное учреждение высшего образования "Самарский государственный технический университет" Work method of boiler plant
CN106439878A (en) * 2016-05-17 2017-02-22 山东泓奥电力科技有限公司 Flue gas waste heat utilizing system of condensed water heating boiler for air supply
CN110925744A (en) * 2019-12-11 2020-03-27 中国能源建设集团广东省电力设计研究院有限公司 System for recycling bypass flue gas heat from heat conducting oil of cold flue gas recirculation unit and control method
CN110925745A (en) * 2019-12-11 2020-03-27 中国能源建设集团广东省电力设计研究院有限公司 Novel efficiency improving system of cold smoke recycling unit and control method
CN110925744B (en) * 2019-12-11 2021-09-17 中国能源建设集团广东省电力设计研究院有限公司 System for recycling bypass flue gas heat from heat conducting oil of cold flue gas recirculation unit and control method

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Inventor after: Huang Xinyuan

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