WO2013040977A1 - Procédé pour l'amélioration de la qualité d'utilisation de la chaleur perdue d'un gaz de combustion - Google Patents

Procédé pour l'amélioration de la qualité d'utilisation de la chaleur perdue d'un gaz de combustion Download PDF

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Publication number
WO2013040977A1
WO2013040977A1 PCT/CN2012/080624 CN2012080624W WO2013040977A1 WO 2013040977 A1 WO2013040977 A1 WO 2013040977A1 CN 2012080624 W CN2012080624 W CN 2012080624W WO 2013040977 A1 WO2013040977 A1 WO 2013040977A1
Authority
WO
WIPO (PCT)
Prior art keywords
flue gas
waste heat
heat
gas waste
utilization
Prior art date
Application number
PCT/CN2012/080624
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English (en)
Chinese (zh)
Inventor
程迪
Original Assignee
上海康洪精密机械有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 上海康洪精密机械有限公司 filed Critical 上海康洪精密机械有限公司
Publication of WO2013040977A1 publication Critical patent/WO2013040977A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L15/00—Heating of air supplied for combustion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
    • F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D21/0001—Recuperative heat exchangers
    • F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
    • 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

Definitions

  • the invention relates to the waste heat recovery and utilization of boiler exhaust, and particularly relates to a system for improving the utilization grade of flue gas waste heat. Background technique
  • the flue gas emitted by the boiler contains acid gas.
  • the temperature of the smoke When the temperature of the smoke is high, they will flow through the heating surfaces of the boiler to the desulfurization tower. When the temperature of the smoke is below a certain temperature, they combine with water vapor in the flue gas to form sulfuric acid and corrode the heat exchange equipment. Low temperature corrosion typically occurs in the cold end of the air preheater and in the economizer where the feed water temperature is low.
  • the temperature of the heated surface is lower than the acid dew point of the flue gas, the water vapor in the flue gas and the sulfuric acid formed by the combustion of the sulfur trioxide (only a small part of the sulfur fuel product) will condense on the heating surface. Upper, severely corroded heated surface.
  • the boiler exhaust gas temperature is usually designed to be high.
  • the new boiler is about 140 °C. After running for a period of time, it tends to be as high as 160 °C. The direct emission of this part of the flue gas causes a large Energy waste.
  • the heat energy grade limited to the flue gas itself is relatively low.
  • the existing waste heat recovery for this part of the flue gas is mainly a heat pipe heat exchanger, and the waste heat of the flue gas is simply used to heat the feed or feed water of the boiler.
  • Heat pipe heat exchangers are components that rely on their internal working liquid phase change to achieve heat transfer.
  • the heat pipe can be divided into two parts: the evaporation section and the condensation section.
  • the steam condenses into a liquid after releasing the latent heat to the cold source in the condensation section; when the working medium evaporates in the evaporation section, the gas-liquid interface is concave, forming a plurality of meniscus liquid surfaces, generating capillary pressure, and the liquid working medium is in the capillary capillary pressure Under the action of return flow such as gravity, it returns to the evaporation section, and continues to absorb heat and evaporate. In this way, the evaporation and condensation of the working fluid continuously transfer heat from the hot end to the cold end.
  • Chinese utility model patent CN201107005Y discloses a composite phase change heat exchanger with a medium and low pressure evaporator, which absorbs the waste heat of the flue gas behind the air preheater through a composite phase change heat device to heat the boiler feed air.
  • the low pressure economizer technology is more widely used. It is installed in the flue of the boiler tail, using the condensate on the water side of the low pressure heater in the steam turbine regenerative system instead of the high pressure. The water supply is used to cool the flue gas.
  • the heat exchange condition is similar to that of the economizer, but the pressure on the water side is much lower than that of the economizer, so it is called the low pressure economizer.
  • the installation of the low-pressure economizer allows the steam turbine heat exchange system to obtain an external heat, which saves a part of the extraction steam, and recovers the heat loss of the exhaust gas well, which improves the thermal efficiency of the whole plant.
  • the problem to be solved by the present invention is to provide a system for improving the utilization level of flue gas waste heat, overcoming the above problems in the prior art.
  • the invention relates to a system for improving the utilization grade of flue gas waste heat, comprising an air preheater disposed at the tail of the boiler flue, and further comprising a flue gas waste heat utilization device and an inlet air preheating device, wherein the inlet air preheating device comprises a connected endothermic device
  • the section and the heat release section, the heat absorption section of the flue gas waste heat utilization device and the inlet air preheating device are arranged in the boiler flue before and behind the air preheater, and the exothermic section is placed in the air preheater In the air inlet channel.
  • the invention further comprises a control system, wherein the heat absorption section is provided with a temperature sensor, a damper regulating valve is arranged in the bypass duct of the air preheater inlet passage, and the temperature sensor and the damper regulating valve are connected with the control system.
  • the invention further comprises a control system, wherein the heat absorption section is provided with a temperature sensor, and a flow regulating valve is arranged on the inlet pipe of the flue gas waste heat utilization device, and the temperature sensor and the flow regulating valve are connected to the control system.
  • the boiler flue of the invention is further provided with a dust removal and desulfurization device, and the heat absorption section is arranged before the dust removal and desulfurization device.
  • the flue gas waste heat utilization device of the present invention is a waste heat evaporator, a heat transfer oil heater or a hot water heater.
  • the system for improving the utilization grade of flue gas waste heat improves the temperature of a secondary air of the inlet air preheater by adding the heat release section of the air inlet preheating device in the air inlet passage. Therefore, the air-to-smoke temperature difference is reduced, the heat exchange amount is reduced, and the temperature at the air preheater outlet is increased, generally increasing by about 30 °C.
  • the system reduces the exhaust gas temperature without affecting the output of the boiler, and at the same time Improve the utilization level of flue gas residual heat behind the air preheater, and safely recover the residual heat of the flue gas.
  • the waste heat of the recovered flue gas heats the wind supply of the boiler, and the waste heat of the flue gas which is improved in taste can be used to generate low-pressure saturated steam, and can also be used to heat hot water or heat the heat-conducting oil, and at the same time ensure that each equipment is not affected by acid dew corrosion. Increased utilization of flue gas waste heat.
  • Fig. 1 is a structural view showing an embodiment of a system for improving the utilization level of flue gas waste heat of the present invention.
  • Fig. 2 is a structural view showing another embodiment of the system for improving the utilization level of flue gas waste heat of the present invention.
  • an embodiment of the present invention for improving a flue gas waste heat utilization grade system includes an air preheater 2 disposed at the tail of the boiler flue, and further includes a flue gas waste heat utilization device 3 and an intake preheating
  • the inlet preheating device comprises a connected heat absorption section 4 and a heat release section 7, and the flue gas waste heat utilization device 3 and the heat absorption section of the inlet air preheating device are arranged in the boiler flue 1 and in the air preheater At the rear of 2, the heat release section 7 is placed in the air inlet passage 8 of the air preheater.
  • the invention absorbs part of flue gas waste heat through the heat absorption section 4 of the air inlet preheating device, and uses the part of residual heat to pass through the heat release section 7 for heating the boiler to a secondary air, and after the temperature of the secondary air rises, the air is preheated.
  • the heat transfer temperature difference between the smoke and the wind in the device 2 is reduced, and the heat transfer amount is reduced. Therefore, the temperature of the smoke at the outlet of the air preheater 2 can be increased to about 18 CTC, so that the inlet smoke temperature of the flue gas waste heat utilization device 3 can be increased by 30 °C. Left and right, the flue gas temperature of the flue gas waste heat utilization device 3 is increased, that is, the utilization grade is improved.
  • the flue gas waste heat utilization device 3 is located between the air preheater 2 and the heat absorption section 4, and the absorption from the air preheater 2 improves the residual heat of the flue gas using the grade.
  • the invention further comprises a control system, a damper regulating valve 6 is arranged in the bypass of the air inlet passage 8 of the air preheater, and a temperature sensor 5 is provided on the heat absorption section 4, the temperature sensor The 5 and damper control valve 6 is connected to the control system.
  • the control system receives the wall temperature on the endothermic section measured by the temperature sensor 5, and adjusts the damper regulating valve 6 in real time according to the height of the wall temperature, thereby adjusting the air volume of the air preheater to ensure that each device is not corroded by acid dew.
  • a dust removal and desulfurization device is also arranged in the boiler flue 1, and the heat absorption section 4 is arranged before the dust removal and desulfurization device, and the flue gas flows into the bacon after passing through the dust removal and desulfurization device.
  • the air preheater outlet smoke temperature is generally around 150 ° C, and the smoke temperature cannot be absorbed to generate low pressure saturated steam.
  • the present invention adds a flue gas waste heat utilization device and an air intake pre-heat in the boiler flue behind the air preheater.
  • the heat device, the waste heat of the flue gas is absorbed by the heat absorption section of the air preheating device, and the heat is transmitted to the air preheater through the heat release section 7 in the air inlet passage of the air preheater, and the cold air absorbs the heat.
  • the air temperature is increased, so that the heat transfer temperature difference between the smoke and the wind in the air preheater 2 is reduced, and the heat transfer amount is reduced.
  • the temperature of the smoke at the outlet of the air preheater 2 can be increased to about 180 ° C, so that the waste heat utilization of the flue gas is utilized.
  • the temperature of the inlet smoke of the device 3 is increased by about 30 °C, so the temperature of the smoke can be absorbed for generating low-pressure saturated steam, while the heat transfer amount of the air preheater is reduced, but the air inlet temperature of the air preheater 2 is lower than the original The air temperature at the outlet of the air preheater will not decrease.
  • FIG. 2 another embodiment of the present invention for improving the flue gas waste heat utilization grade system differs from the above embodiment in the specific design of the control system.
  • the heat absorption section 4 is provided with a temperature sensor 5, in the flue gas.
  • a flow regulating valve 9 is disposed on the inlet pipe of the waste heat utilization device 3, and the temperature sensor 5 and the flow regulating valve 9 are connected to the control system.
  • the control system receives the wall temperature on the heat absorption section measured by the temperature sensor 5, and adjusts the flow regulating valve in real time according to the height of the wall temperature, thereby adjusting the flow rate of the flue gas waste heat utilization device to control the temperature of the smoke absorption, and ensuring each device Not subject to acid dew corrosion.
  • the invention adds a flue gas waste heat utilization device 3 in the boiler flue 1 for absorbing the flue gas residual heat of the improved grade, the smoke
  • the gas waste heat utilization device 3 is a flue gas waste heat evaporator for generating low pressure saturated steam. It is also possible to heat the hot water or the heat transfer oil by using the above-mentioned flue gas waste heat utilization device 3 as a cold water heater or a heat transfer oil heater according to the customer's request.
  • the temperature sensor 5 measures the wall temperature on the heat absorption section 4.
  • the temperature sensor 5 transmits a signal to the control system, and the control system controls the flow regulating valve or the damper regulating valve to adjust
  • the wall temperature of the endothermic section is always higher than the acid dew point temperature, ensuring that each heated surface is not affected by acid dew corrosion.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Air Supply (AREA)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)

Abstract

Un système pour l'amélioration de la qualité d'utilisation de la chaleur perdue d'un gaz de combustion comprend : un préchauffeur d'air (2) agencé au niveau d'une partie de queue d'un conduit de chaudière (1), un dispositif d'utilisation de la chaleur perdue d'un gaz de combustion (3) et un dispositif de préchauffage d'air d'admission. Le dispositif de préchauffage d'air d'admission comprend une section d'absorption de chaleur (4) et une section de libération de chaleur (7) raccordées l'une à l'autre. Le dispositif d'utilisation de la chaleur perdue d'un gaz de combustion (3) et la section d'absorption de chaleur (4) du dispositif de préchauffage d'air d'admission sont agencés séquentiellement dans le conduit de chaudière (1) et sont situés au niveau de l'arrière du préchauffeur d'air (2). La section de libération de chaleur (7) est agencée dans un passage d'admission d'air (8) du préchauffeur d'air (2). Grâce au système, à condition que le rendement de la chaudière ne soit pas affecté, la température du gaz de combustion émis est abaissée, la qualité d'utilisation de la chaleur perdue du gaz de combustion au niveau de l'arrière du préchauffeur d'air (2) est améliorée et la chaleur perdue du gaz de combustion au niveau de la partie de queue de la chaudière est récupérée en toute sécurité.
PCT/CN2012/080624 2011-09-19 2012-08-27 Procédé pour l'amélioration de la qualité d'utilisation de la chaleur perdue d'un gaz de combustion WO2013040977A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201110279049.1 2011-09-19
CN2011102790491A CN102997262A (zh) 2011-09-19 2011-09-19 提高烟气余热利用品位的系统

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WO2013040977A1 true WO2013040977A1 (fr) 2013-03-28

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CN (1) CN102997262A (fr)
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CN108443904A (zh) * 2018-04-19 2018-08-24 北京中矿赛力贝特节能科技有限公司 一种基于热管换热技术的电厂烟气消白系统

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CN103344140B (zh) * 2013-06-26 2014-04-09 山东荷能节能环保科技有限公司 氧化铝生产中废蒸汽余热回收及治理污染的装置及方法
CN104728826A (zh) * 2015-03-19 2015-06-24 中国华能集团清洁能源技术研究院有限公司 恒温省煤器
KR101682229B1 (ko) * 2016-07-11 2016-12-02 박인규 폐기열 회수 열교환기
CN106764995A (zh) * 2016-12-13 2017-05-31 中海油节能环保服务有限公司 一种热管式余热回收装置
CN106765288B (zh) * 2017-03-03 2023-07-18 山西大学 一种电站锅炉回转式空气预热器的分级换热系统
CN109882877B (zh) * 2018-04-14 2020-04-28 青岛科技大学 一种烟气余热利用及其自动控制污染物系统
CN110925745B (zh) * 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 一种新型冷烟再循环机组效率提升系统及控制方法
CN110925744B (zh) * 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 冷烟再循环机组导热油回收旁路烟气热量系统及控制方法
CN111238039B (zh) * 2020-03-17 2024-05-17 中国华能集团清洁能源技术研究院有限公司 一种导热油储热的防锅炉低温腐蚀装置及工作方法
CN112555882B (zh) * 2020-11-25 2023-05-09 希斯芮环境设备工程(连云港)有限公司 一种用于烟囱的节能换热装置
CN112944902B (zh) * 2021-02-01 2023-05-30 湖北中超化工科技有限公司 一种便于余温再利用的烧结炉及其利用方法
CN114892287B (zh) * 2022-06-10 2023-05-23 浙江锦盛控股集团有限公司 超柔软超细旦锦纶fdy多孔丝的生产方法及其加工设备

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CN108443904A (zh) * 2018-04-19 2018-08-24 北京中矿赛力贝特节能科技有限公司 一种基于热管换热技术的电厂烟气消白系统

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CN102997262A (zh) 2013-03-27

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