[go: up one dir, main page]

WO2013040977A1 - System for improving utilization grade of waste heat of flue gas - Google Patents

System for improving utilization grade of waste heat of flue gas Download PDF

Info

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
Other languages
French (fr)
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/en

Links

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.

Landscapes

  • 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

A system for improving the utilization grade of waste heat of flue gas comprises: an air preheater (2) arranged at a tail part of a boiler flue (1), a flue gas waste heat utilization device (3) and an inlet air preheating device. The inlet air preheating device comprises a heat absorption section (4) and a heat release section (7) connected with each other. The flue gas waste heat utilization device (3) and the heat absorption section (4) of the inlet air preheating device are sequentially arranged in the boiler flue (1) and are located at the back of the air preheater (2). The heat release section (7) is arranged in an air inlet passage (8) of the air preheater (2). By using the system, under the condition that the output of the boiler is not affected, the temperature of emitted flue gas is lowered, the utilization grade of the waste heat of the flue gas at the back of the air preheater (2) is improved, and the waste heat of the flue gas at the tail part of the boiler is safely recovered.

Description

提高烟气余热利用品位的系统  System for improving the utilization level of flue gas waste heat
技术领域 Technical field
本发明涉及锅炉排烟的余热回收利用， 特别涉及一种提高烟气余热利用品位的系统。 背景技术  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
锅炉排放的烟气中含有酸性气体， 烟温高时它们会以气态的形式流经锅炉各受热面直 至到脱硫塔里被除去。 当烟温低于某一温度时， 它们会与烟气中的水蒸气结合成硫酸而腐 蚀换热设备。 低温腐蚀通常出现在空气预热器的冷端以及给水温度低的省煤器中。 当受热 面的温度低于烟气的酸露点时， 烟气中的水蒸气和煤燃烧后所生成的三氧化硫 （只是硫的 燃料产物的很少一部分） 结合成的硫酸会凝结在受热面上， 严重腐蚀受热面。 为避免锅炉 尾部受热面的酸露腐蚀， 通常锅炉排烟温度设计较高， 新锅炉 140°C左右， 运行一段时间后 往往会高达 160°C， 这部分烟气的直接排放造成了很大的能源浪费。  The flue gas emitted by the boiler contains acid gas. 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. When 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. In order to avoid acid dew corrosion on the heating surface of the boiler tail, 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.
限于烟气自身的热能品位较低， 现有对这部分烟气余热回收主要为热管换热器， 单纯 地把这部分烟气余热用来加热锅炉的给风或给水。 热管换热器是依靠自身内部工作液体相变 来实现传热的元件。 热管可分为蒸发段、 冷凝段两个部分， 当热源在蒸发段对其供热时， 工 质自热源吸热汽化变为蒸汽， 蒸汽在压差的作用下沿中间通道高速流向另一端， 蒸汽在冷凝 段向冷源放出潜热后冷凝成液体； 工质在蒸发段蒸发时， 其气液交界面下凹， 形成许多弯月 形液面， 产生毛细压力， 液态工质在管芯毛细压力和重力等的回流动力作用下又返回蒸发 段， 继续吸热蒸发， 如此循环往复， 工质的蒸发和冷凝便把热量不断地从热端传递到冷端。 由于热管是利用工质的相变换热来传递热量， 因此热管具有很大的传热能力和传热效率， 加 之设备本身制造工艺简单， 因此在中小型工业锅炉上用途较广。 中国实用新型专利 CN201107005Y 公开一种带中低压蒸发器的复合相变换热器， 通过复合相变换热器吸收空气 预热器后方的烟气余热来加热锅炉给风。  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. When the heat source supplies heat to the evaporation section, the working fluid is heated and vaporized by the heat source to become steam, and the steam flows to the other end along the intermediate channel under the pressure difference. 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. Since the heat pipe uses the phase change heat of the working fluid to transfer heat, the heat pipe has a large heat transfer capacity and heat transfer efficiency, and the manufacturing process of the device itself is simple, so it is widely used in small and medium industrial boilers. 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.
而在某些大的电站锅炉或热电联产锅炉上， 低压省煤器技术应用更加广泛， 它安装在锅 炉尾部烟道中， 利用汽轮机回热系统中的低压加热器水侧的凝结水而非高压给水来冷却烟 气， 其换热条件类似于省煤器， 但水侧的压力远远低于省煤器的压力， 故称其低压省煤器。 低压省煤器的安装使得汽轮机换热系统得到一份外来热量， 节省了一部分抽汽， 很好的回收 排烟热损失， 提高了全厂的热效率。  On some large power station boilers or cogeneration boilers, 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.
然而以上种种都是基于用户有这种低温热能需求才能进行改造的， 由于烟气温度相对较 低， 其热能品位有时无法满足有些用户的用热要求， 特别是需要用余热产生蒸汽的用户， 因 此以上技术并不能完全解决锅炉尾部烟气余热回收利用的问题。 发明内容 However, all of the above are based on the user's low-temperature thermal energy requirements. Because the temperature of the flue gas is relatively low, the thermal energy grade sometimes cannot meet the heat requirements of some users, especially those who need to generate steam with waste heat. This technology does not completely solve the problem of waste heat recovery and utilization in the boiler tail. Summary of the invention
本发明所要解决的问题是提供一种提高烟气余热利用品位的系统， 克服现有技术中存在 的上述问题。  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.
本发明一种提高烟气余热利用品位的系统， 包括设在锅炉烟道尾部的空气预热器， 还包 括烟气余热利用装置和进风预热装置， 进风预热装置包括相连的吸热段和放热段， 烟气余热 利用装置和进风预热装置的吸热段前后排列在锅炉烟道内并位于所述空气预热器的后方， 所 述放热段置于空气预热器的进风通道中。  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.
本发明还包括控制系统， 所述吸热段上设有温度传感器， 所述空气预热器进风通道的旁 路管道中设有风门调节阀， 温度传感器和风门调节阀与控制系统相连。  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.
本发明还包括控制系统， 所述吸热段上设有温度传感器， 在所述烟气余热利用装置的进 口管道上设有流量调节阀， 温度传感器和流量调节阀与控制系统相连。  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.
本发明所述锅炉烟道内还设有除尘脱硫装置， 所述吸热段设于除尘脱硫装置之前。 本发明所述烟气余热利用装置为余热蒸发器、 导热油加热器或热水加热器。  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.
通过以上技术方案， 本发明提高烟气余热利用品位的系统， 通过加装在进风通道中的进 风预热装置的放热段， 使进空气预热器的一二次风温度升高， 从而使空气与烟气温差减小， 换热量减小， 空气预热器出口处温度升高， 一般可升高 30°C左右。 空气预热器进口风温升 高后， 虽然空气预热器换热量减少， 但空气预热器出口风温没有降低， 因此该系统在不影响 锅炉出力的情况下， 降低排烟温度， 同时提高空气预热器后方烟气余热利用品位， 并且安全 回收该部分烟气余热。 回收的烟气余热部分加热了锅炉的给风， 利用品味被提高的烟气余热 可用来产生低压饱和蒸汽， 也可用来加热热水或加热导热油， 同时保证各个设备不受酸露腐 蚀影响， 提高了烟气余热利用率。 附图说明  Through the above technical solution, 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. After the inlet air temperature of the air preheater is increased, although the heat exchange amount of the air preheater is reduced, the air temperature at the outlet of the air preheater is not lowered, so 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. DRAWINGS
图 1本发明提高烟气余热利用品位的系统一实施例结构图。  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.
图 2本发明提高烟气余热利用品位的系统另一实施例结构图。  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.
具体实施方式 如图 1 所示， 本发明一种提高烟气余热利用品位系统的一实施例， 其包括设在锅炉烟 道尾部的空气预热器 2， 还包括烟气余热利用装置 3和进风预热装置， 进风预热装置包括相 连的吸热段 4和放热段 7， 烟气余热利用装置 3和进风预热装置的吸热段前后排列在锅炉烟 道 1内并位于空气预热器 2的后方， 其中放热段 7置于空气预热器的进风通道 8中。 detailed description As shown in FIG. 1, 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 device, 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.
本发明通过进风预热装置吸热段 4吸收部分烟气余热， 并将这部分余热通过放热段 7用 于加热锅炉一二次风， 一二次风温度升高后， 使得空气预热器 2内烟与风的传热温差减小， 传热量变小， 因此空气预热器 2出口处的烟温能提高到 18CTC左右， 可使烟气余热利用装置 3 进口烟温提高 30°C左右， 提高了进烟气余热利用装置 3 的烟气温度， 即提高了其利用品 位。 烟气余热利用装置 3位于空气预热器 2和吸热段 4之间， 吸收从空气预热器 2出来提高 了利用品位的烟气余热。  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.
为避免各个设备受到酸露腐蚀， 本发明还包括控制系统， 空气预热器的进风通道 8的旁 路中设有风门调节阀 6， 在吸热段 4上设有温度传感器 5， 温度传感器 5和风门调节阀 6与 控制系统相连。 控制系统接收温度传感器 5测得的吸热段上的壁温， 根据壁温的高低实时调 节风门调节阀 6， 以此调节空气预热器的进风风量， 确保各个设备不受酸露腐蚀。  In order to avoid the acid corrosion of each device, 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.
在锅炉烟道 1内还设有除尘脱硫装置， 吸热段 4设于除尘脱硫装置之前， 烟气经过除尘 脱硫装置后流入烟肉排出。  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.
空气预热器出口烟温一般在 150°C左右， 此烟温不能被吸收用来产生低压饱和蒸汽， 本 发明在空气预热器后方的锅炉烟道中加设烟气余热利用装置和进风预热装置， 烟气的余热经 进风预热装置的吸热段吸热， 通过放热段 7在空气预热器进风通道中把热量传递给进入空气 预热器的冷风， 冷风吸收热量后风温提高， 使得空气预热器 2内烟与风的传热温差减小， 传 热量变小， 因此空气预热器 2出口处的烟温能提高到 180°C左右， 使得烟气余热利用装置 3 进口烟温提高了 30°C左右， 因此该烟温可被吸收用于产生低压饱和蒸汽， 同时空气预热器 传热量虽然减小， 但是由于空气预热器 2进风温度比原来的有所提高， 空气预热器出口风温 并不会降低。  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. Therefore, 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.
如图 2所示， 本发明提高烟气余热利用品位系统的另一实施例， 与上述实施例不同之处 在于控制系统的具体设计， 在吸热段 4上设有温度传感器 5， 在烟气余热利用装置 3的进口 管道上设有流量调节阀 9， 温度传感器 5和流量调节阀 9与控制系统相连。 控制系统接收温 度传感器 5测得的吸热段上的壁温， 根据壁温的高低实时调节流量调节阀， 以此调节烟气余 热利用装置的流量来控制其吸收烟气的温度， 确保各个设备不受酸露腐蚀。  As shown in 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.
本发明在锅炉烟道 1中加设烟气余热利用装置 3， 用来吸收提高了品位的烟气余热， 烟 气余热利用装置 3为烟气余热蒸发器用来产生低压饱和蒸汽。 也可以按客户要求上述烟气余 热利用装置 3为冷水加热器或导热油加热器， 来加热热水或者导热油。 温度传感器 5测量吸 热段 4上的壁面温度， 当壁面温度小于烟气的酸露点温度时， 温度传感器 5将信号传至控制 系统， 控制系统控制流量调节阀或风门调节阀， 以此来调节吸热段的壁温， 使其始终高于酸 露点温度， 确保各个受热面不受酸露腐蚀影响。 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. When the wall temperature is lower than the acid dew point temperature of the flue gas, 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.

Claims

权利要求书 Claim
1. 一种提高烟气余热利用品位的系统， 包括设在锅炉烟道尾部的空气预热器 （2)， 其特征 在于， 还包括烟气余热利用装置 （3) 和进风预热装置， 进风预热装置包括相连的吸热段 A system for improving the utilization level of flue gas waste heat, comprising an air preheater (2) disposed at the tail of the boiler flue, characterized in that it further comprises a flue gas waste heat utilization device (3) and an inlet air preheating device, Intake preheating device including connected heat absorption section
(4) 和放热段 （7 )， 烟气余热利用装置 （3) 和进风预热装置的吸热段 （4) 前后排列在 锅炉烟道 （1 ) 内并位于所述空气预热器 （2) 的后方， 所述放热段 （7) 置于空气预热器 的进风通道 （8) 中。 (4) and the heat release section (7), the flue gas waste heat utilization device (3) and the heat absorption section (4) of the intake air preheating device are arranged in the boiler flue (1) before and after the air preheater Behind (2), the heat release section (7) is placed in the air inlet passage (8) of the air preheater.
2. 根据权利要求 1 所述提高烟气余热利用品位的系统， 其特征在于， 还包括控制系统， 所 述吸热段 （4) 上设有温度传感器 （5 )， 所述空气预热器的进风通道 （8) 的旁路管道中 设有风门调节阀 （6)， 温度传感器和风门调节阀 （6) 与控制系统相连。  2. The system for improving the utilization level of flue gas waste heat according to claim 1, further comprising a control system, wherein the heat absorption section (4) is provided with a temperature sensor (5), the air preheater A damper regulating valve (6) is provided in the bypass duct of the air inlet passage (8), and the temperature sensor and the damper regulating valve (6) are connected to the control system.
3. 根据权利要求 1 所述提高烟气余热利用品位的系统， 其特征在于， 还包括控制系统， 所 述吸热段 （4) 上设有温度传感器 （5 )， 在所述烟气余热利用装置 （3 ) 的进口管道上设 有流量调节阀 （9)， 温度传感器 （5) 和流量调节阀 （9) 与控制系统相连。  3. The system for improving the utilization level of flue gas waste heat according to claim 1, further comprising a control system, wherein the heat absorption section (4) is provided with a temperature sensor (5) for utilizing the waste heat of the flue gas A flow regulating valve (9) is arranged on the inlet pipe of the device (3), and the temperature sensor (5) and the flow regulating valve (9) are connected to the control system.
4. 根据权利要求 1所述提高烟气余热利用品位的系统， 其特征在于， 所述锅炉烟道 （1 ) 内 还设有除尘脱硫装置， 所述吸热段 （4) 设于除尘脱硫装置之前。  4. The system for improving the utilization level of flue gas waste heat according to claim 1, wherein the boiler flue (1) is further provided with a dust removal and desulfurization device, and the heat absorption section (4) is disposed in the dust removal and desulfurization device. prior to.
5. 根据权利要求 1 所述提高烟气余热利用品位的系统， 其特征在于， 所述烟气余热利用装 置为余热蒸发器。  5. The system for improving the utilization level of flue gas waste heat according to claim 1, wherein the flue gas waste heat utilization device is a waste heat evaporator.
6. 根据权利要求 1 所述提高烟气余热利用品位的系统， 其特征在于， 所述烟气余热利用装 置为导热油加热器。  6. The system for improving the utilization level of flue gas waste heat according to claim 1, wherein the flue gas waste heat utilization device is a heat transfer oil heater.
7. 根据权利要求 1 所述提高烟气余热利用品位的系统， 其特征在于， 所述烟气余热利用装 置为热水加热器。  7. The system for improving the utilization level of flue gas waste heat according to claim 1, wherein the flue gas waste heat utilization device is a hot water heater.
PCT/CN2012/080624 2011-09-19 2012-08-27 System for improving utilization grade of waste heat of flue gas WO2013040977A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2011102790491A CN102997262A (en) 2011-09-19 2011-09-19 System for improving utilization grade of flue gas afterheat
CN201110279049.1 2011-09-19

Publications (1)

Publication Number Publication Date
WO2013040977A1 true WO2013040977A1 (en) 2013-03-28

Family

ID=47913867

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2012/080624 WO2013040977A1 (en) 2011-09-19 2012-08-27 System for improving utilization grade of waste heat of flue gas

Country Status (3)

Country Link
CN (1) CN102997262A (en)
TW (1) TW201319499A (en)
WO (1) WO2013040977A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108443904A (en) * 2018-04-19 2018-08-24 北京中矿赛力贝特节能科技有限公司 A kind of power-plant flue gas based on heat pipe heat exchanging technology disappears white system

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103344140B (en) * 2013-06-26 2014-04-09 山东荷能节能环保科技有限公司 Device and method for exhaust steam waste heat recovery and pollution abatement in aluminum oxide production
CN104728826A (en) * 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 Constant temperature economizer
KR101682229B1 (en) * 2016-07-11 2016-12-02 박인규 Heat exchanger using waste heat
CN106764995A (en) * 2016-12-13 2017-05-31 中海油节能环保服务有限公司 A kind of heat pipe type waste heat reclaiming device
CN106765288B (en) * 2017-03-03 2023-07-18 山西大学 A graded heat exchange system for a rotary air preheater of a utility boiler
CN109882877B (en) * 2018-04-14 2020-04-28 青岛科技大学 Flue gas waste heat utilization and automatic pollutant control system
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
CN110925745B (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 Novel efficiency improving system of cold smoke recycling unit and control method
CN112097230A (en) * 2019-12-19 2020-12-18 上海志筠环保科技有限公司 Controllable biphase heat medium waste heat boiler system
CN111238039B (en) * 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 Device for preventing boiler low-temperature corrosion by heat conduction oil heat storage and working method
CN112344751A (en) * 2020-10-28 2021-02-09 杭州瑞思新材料有限公司 Industrial kiln waste heat recovery device
CN112555882B (en) * 2020-11-25 2023-05-09 希斯芮环境设备工程(连云港)有限公司 Energy-saving heat exchange device for chimney
CN112944902B (en) * 2021-02-01 2023-05-30 湖北中超化工科技有限公司 A kind of sintering furnace which is convenient for the reuse of residual temperature and its utilization method
CN114892287B (en) * 2022-06-10 2023-05-23 浙江锦盛控股集团有限公司 Production method and processing equipment of ultra-soft superfine denier nylon FDY porous yarn

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1359572A1 (en) * 1985-12-09 1987-12-15 Белорусское Отделение Всесоюзного Государственного Научно-Исследовательского И Проектно-Конструкторского Института Энергетической Промышленности Air heater
CN1477333A (en) * 2002-08-21 2004-02-25 杨本洛 Mixed composite phase change heat exchanger
CN201107005Y (en) * 2007-09-28 2008-08-27 杨本洛 Composite phase change heat exchanger with middle and low voltage evaporator
CN101398267A (en) * 2007-09-28 2009-04-01 杨本洛 Internal circulation composite phase change heat exchanger
CN101634457A (en) * 2009-08-19 2010-01-27 深圳中兴科扬节能环保股份有限公司 Flue-gas waste heat reclaiming system
CN202274500U (en) * 2011-09-19 2012-06-13 上海康洪精密机械有限公司 System for improving utilization grade of waste heat of flue gas

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1920387A (en) * 2006-09-05 2007-02-28 山东大学 Low-pressure coal saver for boiler

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1359572A1 (en) * 1985-12-09 1987-12-15 Белорусское Отделение Всесоюзного Государственного Научно-Исследовательского И Проектно-Конструкторского Института Энергетической Промышленности Air heater
CN1477333A (en) * 2002-08-21 2004-02-25 杨本洛 Mixed composite phase change heat exchanger
CN201107005Y (en) * 2007-09-28 2008-08-27 杨本洛 Composite phase change heat exchanger with middle and low voltage evaporator
CN101398267A (en) * 2007-09-28 2009-04-01 杨本洛 Internal circulation composite phase change heat exchanger
CN101634457A (en) * 2009-08-19 2010-01-27 深圳中兴科扬节能环保股份有限公司 Flue-gas waste heat reclaiming system
CN202274500U (en) * 2011-09-19 2012-06-13 上海康洪精密机械有限公司 System for improving utilization grade of waste heat of flue gas

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108443904A (en) * 2018-04-19 2018-08-24 北京中矿赛力贝特节能科技有限公司 A kind of power-plant flue gas based on heat pipe heat exchanging technology disappears white system

Also Published As

Publication number Publication date
TW201319499A (en) 2013-05-16
CN102997262A (en) 2013-03-27

Similar Documents

Publication Publication Date Title
WO2013040977A1 (en) System for improving utilization grade of waste heat of flue gas
CN102997267B (en) Smoke reheating device of combining phase-change heat exchanger with net gas heater
CN102734787B (en) Concurrent recycling system for boiler smoke afterheat
JP2015525863A (en) Co-current boiler flue gas residual heat recovery system
CN105889897B (en) A kind of thermal power plant residual heat integrative recycling system and method
CN202177093U (en) Multi-level efficient displacement type fume waste-heat utilization system
CN201973697U (en) System capable of generating low-pressure steam by utilizing flue gas afterheat
CN103216972A (en) Novel gas-fired boiler smoke discharging and heat recovery method
CN114111094B (en) A desulfurization slurry waste heat recovery device using unit extraction and absorption heat pump
WO2011020333A1 (en) System for recovering waste heat from flue gas
CN209181272U (en) A kind of flue gas waste heat recovery apparatus
CN105277027A (en) Phase-change heat exchanger and heat exchange method thereof
CN103292303B (en) A Latent Heat Recovery System for Water Vapor in Tail Gas of Sleep Activation Furnace
CN204421044U (en) Based on the flue gas waste heat utilization device of cold and heat combined supply
CN202274500U (en) System for improving utilization grade of waste heat of flue gas
CN100520268C (en) Fume-fume hot pipe heater exchanger for fume desulphurization in heat-engine plant
CN102042581A (en) System for generating low-pressure steam by utilizing flue gas waste heat
CN105089729B (en) System and method for recycling waste heat of two-stage efficient circulation evaporation organic Rankine cycle coal-fired flue gas
CN100572920C (en) Evaporative cooling flue gas heater
CN2444189Y (en) Clausilium type heat energy recover using flue gas cooling
CN202692016U (en) Flue gas waste heat recovery system for concurrent boiler
CN206919052U (en) A kind of electric reheating type residual heat from boiler fume depth retracting device
CN109798583A (en) A kind of heat pump heat distribution system comprehensively utilizing flue gas and exhaust steam residual heat
CN104929707B (en) Power plant exhaust steam latent heat and smoke exhaust waste heat combined power generation system and optimal operation method
CN104864383B (en) Ultra-low temperature coal economizer for secondary reheat unit

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 12832852

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 12832852

Country of ref document: EP

Kind code of ref document: A1