WO2022088687A1 - Air and coal gas parallel connection integrated flue gas temperature reducing and energy saving device for coal gas boiler - Google Patents

Air and coal gas parallel connection integrated flue gas temperature reducing and energy saving device for coal gas boiler Download PDF

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Publication number
WO2022088687A1
WO2022088687A1 PCT/CN2021/099377 CN2021099377W WO2022088687A1 WO 2022088687 A1 WO2022088687 A1 WO 2022088687A1 CN 2021099377 W CN2021099377 W CN 2021099377W WO 2022088687 A1 WO2022088687 A1 WO 2022088687A1
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Prior art keywords
flue gas
gas
air
boiler
heat exchanger
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PCT/CN2021/099377
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French (fr)
Chinese (zh)
Inventor
宋自新
王小龙
邵雁
刘立新
余永江
朱能闯
韩力
占成伟
黄永和
张行
张单
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Wisd City Environment Protection Engineering Co Ltd
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Wisd City Environment Protection Engineering Co Ltd
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    • 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
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
    • 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 technical field of gas-fired power generation, in particular to a gas boiler air-gas parallel integrated flue gas temperature reduction and energy saving device.
  • the common measure to reduce the exhaust gas temperature at the tail of the boiler is to increase the area of the air preheater. This measure can reduce the exhaust gas temperature and increase the air temperature entering the furnace.
  • the exhaust gas temperature after the economizer is ⁇ 300 °C.
  • the flue gas temperature is still ⁇ 200 °C, so it is necessary to reduce the flue gas temperature through the air preheater. Measures have limited effect.
  • the commonly used measure is to connect the flue gas-gas heat exchanger in series after the air preheater.
  • the flue gas temperature is still as high as about 160°C after passing through the flue gas-gas heat exchanger; or adopt measures to introduce other cold sources to cool the flue gas, such as setting up a condensate heat exchanger, but this scheme will This increases the heat consumption of the turbine and affects the overall economy of the unit.
  • the purpose of the present invention is to provide a gas boiler air-gas parallel integrated flue gas temperature reduction and energy-saving device, which only relies on the air and fuel required for boiler combustion without using additional cold sources. Reduce the temperature of the flue gas at the tail of the boiler and improve the efficiency of the boiler, thereby improving the overall economy of the unit.
  • the technical scheme of the present invention is a gas boiler air and gas parallel integrated flue gas temperature reduction and energy saving device, including a boiler flue gas system, an air system, a gas system, an air preheater and a flue gas-gas heat exchanger;
  • the air preheater is arranged in parallel with the flue gas-gas heat exchanger, and the flue gas inlet of the air preheater and the flue gas inlet of the flue gas-gas heat exchanger are both connected to the boiler flue gas system.
  • the flue gas outlet of the air preheater and the flue gas outlet of the flue gas-gas heat exchanger are both communicated with the induced draft fan; the air inlet of the air preheater is communicated with the air system, and the air preheater is in communication with the air system.
  • the air outlet of the heat exchanger communicates with the boiler burner; the gas inlet of the flue gas-gas heat exchanger communicates with the gas system, and the gas outlet of the flue gas-gas heat exchanger communicates with the boiler burner.
  • the flue gas inlet of the air preheater is communicated with the boiler flue gas system through the first flue gas intake pipe, and the flue gas inlet of the flue gas-gas heat exchanger is connected to the boiler through the second flue gas intake pipe.
  • the boiler flue gas system is connected; the first flue gas intake pipe and the second flue gas intake pipe are both provided with flue gas regulating dampers.
  • the flue gas outlet of the air preheater is communicated with the induced draft fan through the first flue gas outlet pipe, and the flue gas outlet of the flue gas-gas heat exchanger is connected to the induced draft fan through the second flue gas outlet pipe.
  • the fan is connected; the first flue gas outlet pipe and the second flue gas outlet pipe are both provided with flue gas temperature sensors.
  • the flue gas regulating damper is interlocked with the flue gas temperature sensor.
  • the flue gas-gas heat exchanger adopts the heat pipe type, and the heat pipes are arranged vertically, the upper side is the gas flow, the lower side is the flue gas flow, and the middle is separated by a partition; the flue gas-gas heat exchanger
  • the heat pipe adopts finned tube.
  • the heat pipes on the gas inlet side and the flue gas outlet side of the flue gas-gas heat exchanger are made of ND steel.
  • the air preheater adopts a tubular type, and adopts a horizontal arrangement, and the flue gas flows through the outer flow of the tube, and the air flows through the inner flow of the tube.
  • the heat exchange tube of the air preheater is plated with enamel, and the heat exchange tube on the air inlet side of the air preheater is made of ND steel.
  • the air preheater adopts a heat pipe type, and the upper side is an air flow, the lower layer is a flue gas flow, and the middle is separated by a partition, and the heat exchange tube of the air preheater adopts a fin tube; Or the air heat exchange unit adopts a plate heat exchange type.
  • the present invention has the following beneficial effects:
  • the air preheater and the flue gas-gas heat exchanger are connected in parallel to reduce the exhaust gas temperature at the tail of the boiler.
  • the flue gas is only carried out by relying on the air and fuel required for the boiler combustion. Cooling, further reducing flue gas temperature, thereby improving boiler efficiency and increasing the overall economy of the unit;
  • the inlet of the hollow preheater and the flue gas-gas heat exchanger of the present invention is provided with a flue gas regulating damper, and the outlet is provided with a temperature sensor, which can monitor the flue gas temperature through the temperature sensor, and then adjust the opening of the flue gas regulating damper to ensure Air preheater and flue gas-gas heat exchanger can efficiently exchange heat and reduce flue gas temperature;
  • the hollow preheater and the flue gas gas heat exchanger of the present invention can select different heat exchange surface types according to specific conditions, so as to ensure the recovery of the waste heat of the flue gas and at the same time improve the service life of the equipment.
  • FIG. 1 is a schematic diagram of a gas boiler air-gas parallel integrated flue gas temperature reduction and energy-saving device provided by an embodiment of the present invention
  • Boiler flue gas system 2. Air system; 3. Gas system; 4. Air preheater; 5. Flue gas-gas heat exchanger; 6. Flue gas regulating damper; 7. Flue gas temperature sensor.
  • first and second are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined with “first” and “second” may expressly or implicitly include one or more of the features; in the description of the present invention, unless otherwise specified, the meaning of "multiple” is two or more.
  • this embodiment provides a gas boiler air and gas parallel integrated flue gas temperature reduction and energy saving device, including a boiler flue gas system 1, an air system 2, a gas system 3, an air preheater 4 and a flue gas-gas exchange Heater 5; the air preheater 4 is arranged in parallel with the flue gas-gas heat exchanger 5, and the flue gas inlet of the air preheater 4 and the flue gas inlet of the flue gas-gas heat exchanger 5 Both are communicated with the boiler flue gas system 1, and the flue gas outlet of the air preheater 4 and the flue gas outlet of the flue gas-gas heat exchanger 5 are both communicated with the induced draft fan; the air of the air preheater 4 The inlet is communicated with the air system 2, the air outlet of the air preheater 4 is communicated with the boiler burner; the gas inlet of the flue gas-gas heat exchanger 5 is communicated with the gas system 3, and the flue gas- The gas outlet of the gas heat exchange
  • the air preheater 4 and the flue gas-gas heat exchanger 5 are connected in parallel to reduce the exhaust gas temperature at the tail of the boiler.
  • the air and fuel required for the boiler combustion are only used to further reduce the temperature. flue gas temperature, thereby improving boiler efficiency and increasing unit economy.
  • the air system 2 adopts the blower to supply air during normal operation, and the induced draft fan adopted for the boiler flue gas system 1 exhausts smoke during normal operation; After the gas is mixed, it is pressurized by the induced draft fan and then discharged through the chimney; the air preheater 4 can use a tubular heat exchange surface or a heat pipe heat exchange surface, and the flue gas-gas heat exchanger 5 adopts a heat pipe heat exchange surface.
  • the flue gas inlet of the air preheater 4 is communicated with the boiler flue gas system 1 through the first flue gas inlet pipe, and the flue gas inlet of the flue gas-gas heat exchanger 5 is connected through the second flue gas inlet pipe.
  • the pipe is communicated with the boiler flue gas system 1 ; the first flue gas intake pipe and the second flue gas intake pipe are both provided with a flue gas regulating damper 6 .
  • a flue gas regulating damper 6 is set before the air preheater 4 and the flue gas-gas heat exchanger 5 respectively.
  • the heat exchanger 4 and the flue gas-gas heat exchanger 5 can pass through the flue gas adjusting damper 6 to adjust the distribution of flue gas volume.
  • the flue gas outlet of the air preheater 4 is communicated with the induced draft fan through the first flue gas outlet pipe, and the flue gas outlet of the flue gas-gas heat exchanger 5 is communicated with the induced draft fan through the second flue gas outlet pipe.
  • the induced draft fan is connected; the first flue gas outlet pipe and the second flue gas outlet pipe are both provided with a flue gas temperature sensor 7 .
  • a flue gas temperature sensor 7 is arranged after the air preheater 4 and after the flue gas-gas heat exchanger 5 respectively, which is used to measure the temperature of the flue gas at the outlet of the air preheater 4 and the flue gas at the outlet of the flue gas-gas heat exchanger 5 . The temperature is monitored in real time, and the cooling effect is fed back in time, so as to facilitate the distribution of the flue gas through the flue gas adjustment damper 6 .
  • the flue gas regulating damper 6 is interlocked with the flue gas temperature sensor 7 .
  • the flue gas regulating damper 6 and/or the flue gas-gas exchange at the inlet of the air preheater 4 are adjusted.
  • the flue gas at the inlet of the heater 5 adjusts the opening of the damper 6 to ensure a reasonable distribution of the flue gas, so that the air preheater 4 and the flue gas-gas heat exchanger 5 can efficiently exchange heat, and the cooling effect of the flue gas reaches the required value.
  • the flue gas-gas heat exchanger 5 adopts a heat pipe type heat exchanger, and the heat pipes are arranged vertically, the upper side is the gas flow process, the lower side is the flue gas flow process, the middle is separated by a partition, and the flue gas-gas exchange is used.
  • the heat pipe of the heater 5 adopts a finned tube, which ensures the safety of the system while reducing the exhaust gas temperature.
  • the heat pipes on the gas inlet side and the flue gas outlet side of the flue gas-gas heat exchanger 5 are made of ND steel, which further improves the corrosion resistance of the heat exchange pipes and prolongs the use of the flue gas-gas heat exchanger 5. life.
  • the flue gas-gas heat exchanger 5 can also adopt a plate heat exchange type.
  • the air preheater 4 can be a tubular type air preheater, and the horizontal arrangement is adopted.
  • the flue gas goes outside the pipe and the air goes inside the pipe.
  • the investment cost of the overall system can be reduced.
  • the heat exchange tubes of the air preheater 4 are enamel-plated, and the air inlet side part of the heat exchange tubes of the air preheater 4 is made of ND steel, which further improves the corrosion resistance of the heat exchange tubes and prolongs the air preheater. the service life of the device 4.
  • the air preheater 4 can also adopt a heat pipe type, and the upper side is the air flow, the lower layer is the flue gas flow, and the middle is separated by a partition; the heat exchange tube of the air preheater 4 adopts fins Tube.
  • the hollow preheater 4 in this embodiment can also adopt a plate heat exchange type.
  • the temperature of boiler flue gas after heat exchange through the boiler economizer of boiler flue gas system 1 is ⁇ 300 °C.
  • the gas-gas heat exchanger 5 performs cooling and heat exchange, and distributes the amount of flue gas sent into the air preheater 4 and the flue gas-gas heat exchanger 5 through the first flue gas regulating damper 6;
  • the flue gas temperature sensor 7 is used to monitor the temperature of the flue gas at the outlet of the air preheater 4 and the flue gas-gas heat exchanger 5, so as to monitor the cooling effect of the air preheater 4 and the flue gas-gas heat exchanger 5 on the flue gas.
  • the signals are respectively fed back to the flue gas adjustment damper 6 after processing to adjust the amount of flue gas, so as to ensure that the distribution of flue gas is reasonable and the cooling effect of flue gas reaches the required value.
  • the temperature can be reduced to ⁇ 100°C, which can effectively recover the waste heat of the flue gas, which is relatively conventional.
  • the overall efficiency of the boiler can be increased by 2% to 3%.
  • the gas boiler air and gas parallel integrated flue gas temperature reduction and energy saving device of this embodiment is not limited to the tail gas treatment of gas boilers, and is also applicable to the tail gas treatment of boilers burning other fuels; and the gas boiler air
  • the gas parallel integrated flue gas temperature reduction and energy saving device is not limited to the use of air preheater and flue gas-gas heat exchanger for flue gas cooling, but also applies to systems with other cold sources for flue gas cooling treatment.

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Abstract

An air and coal gas parallel connection integrated flue gas temperature reducing and energy saving device for a coal gas boiler, the device comprising a boiler flue gas system (1), an air system (2), a coal gas system (3), an air preheater (4) and a flue gas-coal gas heat exchanger (5), wherein the air preheater (4) and the flue gas-coal gas heat exchanger (5) are arranged in parallel; a flue gas inlet of the air preheater (4) and a flue gas inlet of the flue gas-coal gas heat exchanger (5) are both in communication with the boiler flue gas system (1); and a flue gas outlet of the air preheater (4) and a flue gas outlet of the flue gas-coal gas heat exchanger (5) are both in communication with an induced draft fan. The air preheater (4) and the flue gas-coal gas heat exchanger (5) are connected in parallel so as to reduce the exhaust gas temperature at the tail of the boiler to improve the economical efficiency of a unit.

Description

一种煤气锅炉空气煤气并联一体化降烟温节能装置A gas boiler air gas parallel integrated flue gas temperature reduction and energy saving device 技术领域technical field

本发明涉及燃气发电技术领域，具体涉及一种煤气锅炉空气煤气并联一体化降烟温节能装置。The invention relates to the technical field of gas-fired power generation, in particular to a gas boiler air-gas parallel integrated flue gas temperature reduction and energy saving device.

背景技术Background technique

钢铁企业生产过程中有大量富余煤气产生，为了提高经济效益，改善环境，将富余煤气回收进行发电是钢铁较为常见的能源清洁利用措施。对于煤气锅炉而言，由于其自身特点，排烟热损失占锅炉热损失的80％以上，因而降低排烟热损失是提高煤气锅炉效率最有效的手段，而决定排烟热损失的最要因素是排烟温度，所以，提高锅炉热效率的主要途径是降低锅炉的排烟温度。In the production process of iron and steel enterprises, a large amount of surplus gas is produced. In order to improve economic benefits and improve the environment, recycling the surplus gas for power generation is a relatively common measure for clean energy utilization in iron and steel. For the gas boiler, due to its own characteristics, the heat loss of exhaust gas accounts for more than 80% of the heat loss of the boiler, so reducing the heat loss of exhaust gas is the most effective means to improve the efficiency of the gas boiler, and the most important factor to determine the heat loss of exhaust gas is the exhaust gas temperature, so the main way to improve the thermal efficiency of the boiler is to reduce the exhaust gas temperature of the boiler.

目前，常见的降低锅炉尾部排烟温度的措施是增加空气预热器的面积，此措施可降低排烟温度的同时可以提高进入炉膛的空气温度，但由于高炉煤气的燃料特性，其燃烧所需要的空气量很少，对于高参数机组而言，省煤器后排烟温度～300℃，经空预器降温后，烟气温度仍然有～200℃，因此通过空预器降低烟气温度的措施效果有限。为进一步降低烟气温度，目前常用的措施是在空预器后串联烟气-煤气换热器，通过烟气-煤气换热器后，烟气温度可进一步降低到140℃左右，但部分钢铁企业由于煤气温度较高，经过烟气-煤气换热器后烟气温度仍然高达160℃左右；或采用引入其他冷源的措施进行烟气降温，如设置凝结水换热器，但此方案将使得汽机热耗增加，影响机组整体经济性。At present, the common measure to reduce the exhaust gas temperature at the tail of the boiler is to increase the area of the air preheater. This measure can reduce the exhaust gas temperature and increase the air temperature entering the furnace. However, due to the fuel characteristics of blast furnace gas, its combustion requires The air volume is very small. For high-parameter units, the exhaust gas temperature after the economizer is ~300 °C. After cooling by the air preheater, the flue gas temperature is still ~200 °C, so it is necessary to reduce the flue gas temperature through the air preheater. Measures have limited effect. In order to further reduce the flue gas temperature, the commonly used measure is to connect the flue gas-gas heat exchanger in series after the air preheater. Due to the high gas temperature, the flue gas temperature is still as high as about 160°C after passing through the flue gas-gas heat exchanger; or adopt measures to introduce other cold sources to cool the flue gas, such as setting up a condensate heat exchanger, but this scheme will This increases the heat consumption of the turbine and affects the overall economy of the unit.

发明内容SUMMARY OF THE INVENTION

为了克服上述现有技术存在的不足，本发明的目的是提供一种煤气锅炉空 气煤气并联一体化降烟温节能装置，在不采用额外冷源前提下，仅依靠锅炉燃烧所需空气及燃料进一步降低锅炉尾部烟气温度，提高锅炉效率，从而提高机组整体经济性。In order to overcome the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a gas boiler air-gas parallel integrated flue gas temperature reduction and energy-saving device, which only relies on the air and fuel required for boiler combustion without using additional cold sources. Reduce the temperature of the flue gas at the tail of the boiler and improve the efficiency of the boiler, thereby improving the overall economy of the unit.

为实现上述目的，本发明的技术方案为一种煤气锅炉空气煤气并联一体化降烟温节能装置，包括锅炉烟气系统、空气系统、煤气系统、空预器和烟气-煤气换热器；所述空预器与所述烟气-煤气换热器并联设置，且所述空预器的烟气进口和所述烟气-煤气换热器的烟气进口均与所述锅炉烟气系统连通，所述空预器的烟气出口和所述烟气-煤气换热器的烟气出口均与引风机连通；所述空预器的空气进口与所述空气系统连通，所述空预器的空气出口与锅炉燃烧器连通；所述烟气-煤气换热器的煤气进口与所述煤气系统连通，所述烟气-煤气换热器的煤气出口与所述锅炉燃烧器连通。In order to achieve the above purpose, the technical scheme of the present invention is a gas boiler air and gas parallel integrated flue gas temperature reduction and energy saving device, including a boiler flue gas system, an air system, a gas system, an air preheater and a flue gas-gas heat exchanger; The air preheater is arranged in parallel with the flue gas-gas heat exchanger, and the flue gas inlet of the air preheater and the flue gas inlet of the flue gas-gas heat exchanger are both connected to the boiler flue gas system. The flue gas outlet of the air preheater and the flue gas outlet of the flue gas-gas heat exchanger are both communicated with the induced draft fan; the air inlet of the air preheater is communicated with the air system, and the air preheater is in communication with the air system. The air outlet of the heat exchanger communicates with the boiler burner; the gas inlet of the flue gas-gas heat exchanger communicates with the gas system, and the gas outlet of the flue gas-gas heat exchanger communicates with the boiler burner.

进一步地，所述空预器的烟气进口通过第一烟气进管与所述锅炉烟气系统连通，所述烟气-煤气换热器的烟气进口通过第二烟气进管与所述锅炉烟气系统连通；所述第一烟气进管和所述第二烟气进管上均设有烟气调节风门。Further, the flue gas inlet of the air preheater is communicated with the boiler flue gas system through the first flue gas intake pipe, and the flue gas inlet of the flue gas-gas heat exchanger is connected to the boiler through the second flue gas intake pipe. The boiler flue gas system is connected; the first flue gas intake pipe and the second flue gas intake pipe are both provided with flue gas regulating dampers.

进一步地，所述空预器的烟气出口通过第一烟气出管与所述引风机连通，所述烟气-煤气换热器的烟气出口通过第二烟气出管与所述引风机连通；所述第一烟气出管和所述第二烟气出管上均设有烟气温度传感器。Further, the flue gas outlet of the air preheater is communicated with the induced draft fan through the first flue gas outlet pipe, and the flue gas outlet of the flue gas-gas heat exchanger is connected to the induced draft fan through the second flue gas outlet pipe. The fan is connected; the first flue gas outlet pipe and the second flue gas outlet pipe are both provided with flue gas temperature sensors.

更进一步地，所述烟气调节风门与所述烟气温度传感器连锁。Further, the flue gas regulating damper is interlocked with the flue gas temperature sensor.

进一步地，所述烟气-煤气换热器采用热管型式，且热管垂直布置，上侧为煤气流程，下侧为烟气流程，中间采用隔板隔开；所述烟气-煤气换热器的热管采用翅片管。Further, the flue gas-gas heat exchanger adopts the heat pipe type, and the heat pipes are arranged vertically, the upper side is the gas flow, the lower side is the flue gas flow, and the middle is separated by a partition; the flue gas-gas heat exchanger The heat pipe adopts finned tube.

更进一步地，所述烟气-煤气换热器的煤气入口侧和烟气出口侧的热管采用ND钢材质。Further, the heat pipes on the gas inlet side and the flue gas outlet side of the flue gas-gas heat exchanger are made of ND steel.

作为一种实施方式，所述空预器采用管式型式，且采用卧式布置，烟气走管外流程，空气走管内流程。As an embodiment, the air preheater adopts a tubular type, and adopts a horizontal arrangement, and the flue gas flows through the outer flow of the tube, and the air flows through the inner flow of the tube.

更进一步地，所述空预器的换热管外镀搪瓷，且所述空预器的空气入口侧的换热管采用ND钢材质。Further, the heat exchange tube of the air preheater is plated with enamel, and the heat exchange tube on the air inlet side of the air preheater is made of ND steel.

作为另一种实施方式，所述空预器采用热管型式，且上侧为空气流程，下层为烟气流程，中间采用隔板隔开，所述空预器的换热管采用翅片管；或者所述空气换热单元采用板式换热型式。As another embodiment, the air preheater adopts a heat pipe type, and the upper side is an air flow, the lower layer is a flue gas flow, and the middle is separated by a partition, and the heat exchange tube of the air preheater adopts a fin tube; Or the air heat exchange unit adopts a plate heat exchange type.

与现有技术相比，本发明具有以下有益效果：Compared with the prior art, the present invention has the following beneficial effects:

(1)本发明中采用空预器和烟气-煤气换热器并联的方式来降低锅炉尾部排烟温度，在不采用额外冷源前提下，仅依靠锅炉燃烧所需空气及燃料进行烟气降温，进一步降低烟气温度，从而提高锅炉效率，增加机组整体经济性；(1) In the present invention, the air preheater and the flue gas-gas heat exchanger are connected in parallel to reduce the exhaust gas temperature at the tail of the boiler. On the premise that no additional cold source is used, the flue gas is only carried out by relying on the air and fuel required for the boiler combustion. Cooling, further reducing flue gas temperature, thereby improving boiler efficiency and increasing the overall economy of the unit;

(2)本发明中空预器和烟气-煤气换热器入口设置有烟气调节风门，出口设置有温度传感器，可通过温度传感器进行烟气温度监控，进而调节烟气调节风门开度，保证空预器和烟气-煤气换热器能高效进行换热，降低烟气温度；(2) The inlet of the hollow preheater and the flue gas-gas heat exchanger of the present invention is provided with a flue gas regulating damper, and the outlet is provided with a temperature sensor, which can monitor the flue gas temperature through the temperature sensor, and then adjust the opening of the flue gas regulating damper to ensure Air preheater and flue gas-gas heat exchanger can efficiently exchange heat and reduce flue gas temperature;

(3)本发明中空预器和烟气煤气换热器可根据具体情况选取不同的换热面型式，保证回收烟气余热的同时，提高设备的使用寿命。(3) The hollow preheater and the flue gas gas heat exchanger of the present invention can select different heat exchange surface types according to specific conditions, so as to ensure the recovery of the waste heat of the flue gas and at the same time improve the service life of the equipment.

附图说明Description of drawings

为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其它的附图。In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that are used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

图1为本发明实施例提供的煤气锅炉空气煤气并联一体化降烟温节能装置的示意图；1 is a schematic diagram of a gas boiler air-gas parallel integrated flue gas temperature reduction and energy-saving device provided by an embodiment of the present invention;

图中：1、锅炉烟气系统；2、空气系统；3、煤气系统；4、空预器；5、烟气-煤气换热器；6、烟气调节风门；7、烟气温度传感器。In the figure: 1. Boiler flue gas system; 2. Air system; 3. Gas system; 4. Air preheater; 5. Flue gas-gas heat exchanger; 6. Flue gas regulating damper; 7. Flue gas temperature sensor.

具体实施方式Detailed ways

下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其它实施例，都属于本发明保护的范围。The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

在本发明的描述中，需要理解的是，术语“中心”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。In the description of the present invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", The orientation or positional relationship indicated by "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying The device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention.

术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个该特征；在本发明的描述中，除非另有说明，“多个”的含义是两个或两个以上。The terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined with "first" and "second" may expressly or implicitly include one or more of the features; in the description of the present invention, unless otherwise specified, the meaning of "multiple" is two or more.

如图1所示，本实施例提供一种煤气锅炉空气煤气并联一体化降烟温节能装置，包括锅炉烟气系统1、空气系统2、煤气系统3、空预器4和烟气-煤气换热器5；所述空预器4与所述烟气-煤气换热器5并联设置，且所述空预器4的烟气进口和所述烟气-煤气换热器5的烟气进口均与所述锅炉烟气系统1连通，所述空预器4的烟气出口和所述烟气-煤气换热器5的烟气出口均与引风机连通；所述空预器4的空气进口与所述空气系统2连通，所述空预器4的空气出口与锅炉燃烧器连通；所述烟气-煤气换热器5的煤气进口与所述煤气系统3连通，所述烟气-煤气换热器5的煤气出口与所述锅炉燃烧器连通。本实施例通过采用空预器4和烟气-煤气换热器5并联的方式来降低锅炉尾部排烟温度，在不采用 额外冷源前提下，仅依靠锅炉燃烧所需空气及燃料，进一步降低烟气温度，从而提高锅炉效率，增加机组经济性。本实施例中空气系统2采用的是送风机正常运行时送风，锅炉烟气系统1采用的引风机正常运行时排烟；空预器4出口烟气和烟气-煤气换热器5出口烟气混合后通过引风机加压后经烟囱排放；空预器4可采用管式换热面，也可采用热管式换热面，烟气-煤气换热器5采用热管式换热面。As shown in FIG. 1 , this embodiment provides a gas boiler air and gas parallel integrated flue gas temperature reduction and energy saving device, including a boiler flue gas system 1, an air system 2, a gas system 3, an air preheater 4 and a flue gas-gas exchange Heater 5; the air preheater 4 is arranged in parallel with the flue gas-gas heat exchanger 5, and the flue gas inlet of the air preheater 4 and the flue gas inlet of the flue gas-gas heat exchanger 5 Both are communicated with the boiler flue gas system 1, and the flue gas outlet of the air preheater 4 and the flue gas outlet of the flue gas-gas heat exchanger 5 are both communicated with the induced draft fan; the air of the air preheater 4 The inlet is communicated with the air system 2, the air outlet of the air preheater 4 is communicated with the boiler burner; the gas inlet of the flue gas-gas heat exchanger 5 is communicated with the gas system 3, and the flue gas- The gas outlet of the gas heat exchanger 5 communicates with the boiler burner. In this embodiment, the air preheater 4 and the flue gas-gas heat exchanger 5 are connected in parallel to reduce the exhaust gas temperature at the tail of the boiler. On the premise of not using an additional cold source, the air and fuel required for the boiler combustion are only used to further reduce the temperature. flue gas temperature, thereby improving boiler efficiency and increasing unit economy. In this embodiment, the air system 2 adopts the blower to supply air during normal operation, and the induced draft fan adopted for the boiler flue gas system 1 exhausts smoke during normal operation; After the gas is mixed, it is pressurized by the induced draft fan and then discharged through the chimney; the air preheater 4 can use a tubular heat exchange surface or a heat pipe heat exchange surface, and the flue gas-gas heat exchanger 5 adopts a heat pipe heat exchange surface.

进一步地，所述空预器4的烟气进口通过第一烟气进管与所述锅炉烟气系统1连通，所述烟气-煤气换热器5的烟气进口通过第二烟气进管与所述锅炉烟气系统1连通；所述第一烟气进管和所述第二烟气进管上均设有烟气调节风门6。本实施例中分别在空预器4前和烟气-煤气换热器5前设置烟气调节风门6，烟气通过锅炉烟气系统1的锅炉省煤器后分两路，分别进入空预器4和烟气-煤气换热器5，可以通烟气调节风门6进行烟气量分配调节。Further, the flue gas inlet of the air preheater 4 is communicated with the boiler flue gas system 1 through the first flue gas inlet pipe, and the flue gas inlet of the flue gas-gas heat exchanger 5 is connected through the second flue gas inlet pipe. The pipe is communicated with the boiler flue gas system 1 ; the first flue gas intake pipe and the second flue gas intake pipe are both provided with a flue gas regulating damper 6 . In this embodiment, a flue gas regulating damper 6 is set before the air preheater 4 and the flue gas-gas heat exchanger 5 respectively. The heat exchanger 4 and the flue gas-gas heat exchanger 5 can pass through the flue gas adjusting damper 6 to adjust the distribution of flue gas volume.

进一步地，所述空预器4的烟气出口通过第一烟气出管与所述引风机连通，所述烟气-煤气换热器5的烟气出口通过第二烟气出管与所述引风机连通；所述第一烟气出管和所述第二烟气出管上均设有烟气温度传感器7。本实施例分别在空预器4后和烟气-煤气换热器5后设置烟气温度传感器7，用于对空预器4出口烟气和烟气-煤气换热器5出口烟气的温度进行实时监控，及时反馈降温效果，以便于通过烟气调节风门6进行烟气分配。Further, the flue gas outlet of the air preheater 4 is communicated with the induced draft fan through the first flue gas outlet pipe, and the flue gas outlet of the flue gas-gas heat exchanger 5 is communicated with the induced draft fan through the second flue gas outlet pipe. The induced draft fan is connected; the first flue gas outlet pipe and the second flue gas outlet pipe are both provided with a flue gas temperature sensor 7 . In this embodiment, a flue gas temperature sensor 7 is arranged after the air preheater 4 and after the flue gas-gas heat exchanger 5 respectively, which is used to measure the temperature of the flue gas at the outlet of the air preheater 4 and the flue gas at the outlet of the flue gas-gas heat exchanger 5 . The temperature is monitored in real time, and the cooling effect is fed back in time, so as to facilitate the distribution of the flue gas through the flue gas adjustment damper 6 .

更进一步地，所述烟气调节风门6与烟气温度传感器7连锁。本实施例根据烟气温度传感器检测的空预器4出口和烟气-煤气换热器5出口的烟气温度，调节空预器4进口的烟气调节风门6和/或烟气-煤气换热器5进口的烟气调节风门6的开度，保证烟气的分配合理，使空预器4和烟气-煤气换热器5能够高效进行换热，烟气的降温效果达到要求值。Furthermore, the flue gas regulating damper 6 is interlocked with the flue gas temperature sensor 7 . In this embodiment, according to the flue gas temperature detected by the flue gas temperature sensor at the outlet of the air preheater 4 and the outlet of the flue gas-gas heat exchanger 5, the flue gas regulating damper 6 and/or the flue gas-gas exchange at the inlet of the air preheater 4 are adjusted. The flue gas at the inlet of the heater 5 adjusts the opening of the damper 6 to ensure a reasonable distribution of the flue gas, so that the air preheater 4 and the flue gas-gas heat exchanger 5 can efficiently exchange heat, and the cooling effect of the flue gas reaches the required value.

进一步地，所述烟气-煤气换热器5采用热管型式换热器，且热管垂直布置， 上侧为煤气流程，下侧为烟气流程，中间采用隔板隔开，烟气-煤气换热器5的热管采用翅片管；在保证降低排烟温度的同时，保证系统安全。更进一步地，所述烟气-煤气换热器5的煤气入口侧和烟气出口侧的热管采用ND钢材质，进一步提高换热管耐腐蚀性能，延长烟气-煤气换热器5的使用寿命。本实施例中烟气-煤气换热器5也可以采用板式换热型式。Further, the flue gas-gas heat exchanger 5 adopts a heat pipe type heat exchanger, and the heat pipes are arranged vertically, the upper side is the gas flow process, the lower side is the flue gas flow process, the middle is separated by a partition, and the flue gas-gas exchange is used. The heat pipe of the heater 5 adopts a finned tube, which ensures the safety of the system while reducing the exhaust gas temperature. Further, the heat pipes on the gas inlet side and the flue gas outlet side of the flue gas-gas heat exchanger 5 are made of ND steel, which further improves the corrosion resistance of the heat exchange pipes and prolongs the use of the flue gas-gas heat exchanger 5. life. In this embodiment, the flue gas-gas heat exchanger 5 can also adopt a plate heat exchange type.

作为一种实施方式，所述空预器4可以采用管式型式空气预热器，且采用卧式布置，烟气走管外流程，空气走管内流程，在保证空预器4寿命的同时，可降低整体系统的投资成本。更进一步地，所述空预器4的换热管外镀搪瓷，且所述空预器4的空气入口侧部分换热管采用ND钢材质，进一步提高换热管耐腐蚀性能，延长空预器4的使用寿命。As an embodiment, the air preheater 4 can be a tubular type air preheater, and the horizontal arrangement is adopted. The flue gas goes outside the pipe and the air goes inside the pipe. The investment cost of the overall system can be reduced. Further, the heat exchange tubes of the air preheater 4 are enamel-plated, and the air inlet side part of the heat exchange tubes of the air preheater 4 is made of ND steel, which further improves the corrosion resistance of the heat exchange tubes and prolongs the air preheater. the service life of the device 4.

作为另一种实施方式，所述空预器4还可以采用热管型式，且上侧为空气流程，下层为烟气流程，中间采用隔板隔开；空预器4的换热管采用翅片管。本实施例中空预器4也可以采用板式换热型式。As another embodiment, the air preheater 4 can also adopt a heat pipe type, and the upper side is the air flow, the lower layer is the flue gas flow, and the middle is separated by a partition; the heat exchange tube of the air preheater 4 adopts fins Tube. The hollow preheater 4 in this embodiment can also adopt a plate heat exchange type.

采用本实施例的煤气锅炉烟气降温节能装置来降低锅炉尾部排烟温度的过程如下：The process of using the gas boiler flue gas cooling and energy saving device of the present embodiment to reduce the exhaust gas temperature at the tail of the boiler is as follows:

锅炉燃料燃烧所需空气通过送风机加压后，经空预器4送入锅炉燃烧器与经烟气-煤气换热器5送入锅炉燃烧器的煤气混合后进行燃烧，燃烧后的锅炉烟气送入本实施例的煤气锅炉烟气降温节能装置处理后通过引风机引至烟囱排放；After the air required for the combustion of the boiler fuel is pressurized by the blower, it is fed into the boiler burner through the air preheater 4 and mixed with the gas fed into the boiler burner through the flue gas-gas heat exchanger 5 for combustion. The burned boiler flue gas After being sent to the gas boiler flue gas cooling and energy saving device of the present embodiment, it is led to the chimney through the induced draft fan for discharge;

对于超高压及以上参数的机组，锅炉烟气经锅炉烟气系统1的锅炉省煤器换热后温度为～300℃，此时烟气分为两路，分别送入空预器4和烟气-煤气换热器5进行降温换热，通过第一烟气调节风门6对送入空预器4和烟气-煤气换热器5的烟气量进行分配；For units with ultra-high pressure and above parameters, the temperature of boiler flue gas after heat exchange through the boiler economizer of boiler flue gas system 1 is ~300 °C. The gas-gas heat exchanger 5 performs cooling and heat exchange, and distributes the amount of flue gas sent into the air preheater 4 and the flue gas-gas heat exchanger 5 through the first flue gas regulating damper 6;

同时采用烟气温度传感器7分别对空预器4和烟气-煤气换热器5出口的烟气温度进行监控，以对空预器4和烟气-煤气换热器5对烟气降温效果进行验证，信号经处理后分别反馈至烟气调节风门6对烟气量进行调节，保证烟气的分配合理，烟气的降温效果达到要求值。At the same time, the flue gas temperature sensor 7 is used to monitor the temperature of the flue gas at the outlet of the air preheater 4 and the flue gas-gas heat exchanger 5, so as to monitor the cooling effect of the air preheater 4 and the flue gas-gas heat exchanger 5 on the flue gas. After verification, the signals are respectively fed back to the flue gas adjustment damper 6 after processing to adjust the amount of flue gas, so as to ensure that the distribution of flue gas is reasonable and the cooling effect of flue gas reaches the required value.

经核算，对于燃用高炉煤气的锅炉，其排烟温度经本实施例提供的煤气锅炉烟气降温节能装置进行降温后，温度可降低至～100℃，可有效的回收烟气余热，相对常规方案，锅炉整体效率可提高2％～3％。After calculation, for the boiler burning blast furnace gas, after the exhaust gas temperature is cooled down by the gas boiler flue gas cooling and energy saving device provided in this embodiment, the temperature can be reduced to ~100°C, which can effectively recover the waste heat of the flue gas, which is relatively conventional. The overall efficiency of the boiler can be increased by 2% to 3%.

本实施例的煤气锅炉空气煤气并联一体化降烟温节能装置并不限定于煤气锅炉的尾部烟气处理，同样适用于燃用其他燃料的锅炉尾部烟气处理；且本实施例的煤气锅炉空气煤气并联一体化降烟温节能装置并不限定于采用空预器和烟气-煤气换热器进行烟气降温，同样适用于有其他冷源进行烟气降温处理的系统。The gas boiler air and gas parallel integrated flue gas temperature reduction and energy saving device of this embodiment is not limited to the tail gas treatment of gas boilers, and is also applicable to the tail gas treatment of boilers burning other fuels; and the gas boiler air The gas parallel integrated flue gas temperature reduction and energy saving device is not limited to the use of air preheater and flue gas-gas heat exchanger for flue gas cooling, but also applies to systems with other cold sources for flue gas cooling treatment.

以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (9)

一种煤气锅炉空气煤气并联一体化降烟温节能装置，其特征在于：包括锅炉烟气系统、空气系统、煤气系统、空预器和烟气-煤气换热器；所述空预器与所述烟气-煤气换热器并联设置，且所述空预器的烟气进口和所述烟气-煤气换热器的烟气进口均与所述锅炉烟气系统连通，所述空预器的烟气出口和所述烟气-煤气换热器的烟气出口均与引风机连通；所述空预器的空气进口与所述空气系统连通，所述空预器的空气出口与锅炉燃烧器连通；所述烟气-煤气换热器的煤气进口与所述煤气系统连通，所述烟气-煤气换热器的煤气出口与所述锅炉燃烧器连通。A gas boiler air and gas parallel integrated flue gas temperature reduction and energy saving device is characterized in that: it includes a boiler flue gas system, an air system, a gas system, an air preheater and a flue gas-gas heat exchanger; The flue gas-gas heat exchangers are arranged in parallel, and the flue gas inlet of the air preheater and the flue gas inlet of the flue gas-gas heat exchanger are both communicated with the boiler flue gas system, and the air preheater The flue gas outlet and the flue gas outlet of the flue gas-gas heat exchanger are both communicated with the induced draft fan; the air inlet of the air preheater is communicated with the air system, and the air outlet of the air preheater is connected to the boiler combustion The gas inlet of the flue gas-gas heat exchanger is communicated with the gas system, and the gas outlet of the flue gas-gas heat exchanger is communicated with the boiler burner. 如权利要求1所述的一种煤气锅炉空气煤气并联一体化降烟温节能装置，其特征在于：所述空预器的烟气进口通过第一烟气进管与所述锅炉烟气系统连通，所述烟气-煤气换热器的烟气进口通过第二烟气进管与所述锅炉烟气系统连通；所述第一烟气进管和所述第二烟气进管上均设有烟气调节风门。A gas boiler air-gas parallel integrated flue gas temperature reduction and energy saving device according to claim 1, characterized in that: the flue gas inlet of the air preheater communicates with the boiler flue gas system through the first flue gas inlet pipe , the flue gas inlet of the flue gas-gas heat exchanger is communicated with the boiler flue gas system through the second flue gas intake pipe; the first flue gas intake pipe and the second flue gas intake pipe are both provided with There is a smoke regulating damper. 如权利要求2所述的一种煤气锅炉空气煤气并联一体化降烟温节能装置，其特征在于：所述空预器的烟气出口通过第一烟气出管与所述引风机连通，所述烟气-煤气换热器的烟气出口通过第二烟气出管与所述引风机连通；所述第一烟气出管和所述第二烟气出管上均设有烟气温度传感器。The gas boiler air-gas parallel integrated flue gas temperature reduction and energy saving device according to claim 2, wherein the flue gas outlet of the air preheater is communicated with the induced draft fan through the first flue gas outlet pipe, so The flue gas outlet of the flue gas-gas heat exchanger is communicated with the induced draft fan through the second flue gas outlet pipe; the first flue gas outlet pipe and the second flue gas outlet pipe are both provided with flue gas temperature sensor. 如权利要求3所述的一种煤气锅炉空气煤气并联一体化降烟温节能装置，其特征在于：所述烟气调节风门与所述烟气温度传感器连锁。A gas boiler air-gas parallel integrated flue gas temperature reduction and energy saving device according to claim 3, characterized in that: the flue gas regulating damper is interlocked with the flue gas temperature sensor. 如权利要求1所述的一种煤气锅炉空气煤气并联一体化降烟温节能装置，其特征在于：所述烟气-煤气换热器采用热管型式，且热管垂直布置，上侧为煤气流程，下侧为烟气流程，中间采用隔板隔开；所述烟气-煤气换热器的热管采用翅片管。A gas boiler air-gas parallel integrated flue gas temperature reduction and energy-saving device as claimed in claim 1, characterized in that: the flue gas-gas heat exchanger adopts a heat pipe type, and the heat pipes are arranged vertically, and the upper side is the gas flow, The lower side is the flue gas flow process, and the middle is separated by a partition; the heat pipe of the flue gas-gas heat exchanger is a finned tube. 如权利要求5所述的一种煤气锅炉空气煤气并联一体化降烟温节能装置，其 特征在于：所述烟气-煤气换热器的煤气入口侧和烟气出口侧的热管采用ND钢材质。A gas boiler air-gas parallel integrated flue gas temperature reduction and energy saving device as claimed in claim 5, characterized in that: the heat pipes on the gas inlet side and the flue gas outlet side of the flue gas-gas heat exchanger are made of ND steel. . 如权利要求1所述的一种煤气锅炉空气煤气并联一体化降烟温节能装置，其特征在于：所述空预器采用管式型式，且采用卧式布置，烟气走管外流程，空气走管内流程。A gas boiler air-gas parallel integrated flue gas temperature reduction and energy saving device according to claim 1, characterized in that: the air preheater adopts a tubular type, and adopts a horizontal arrangement, the flue gas goes out of the pipe, and the air Process inside the tube. 如权利要求7所述的一种煤气锅炉空气煤气并联一体化降烟温节能装置，其特征在于：所述空预器的换热管外镀搪瓷，且所述空预器的空气入口侧的换热管采用ND钢材质。A gas boiler air-gas parallel integrated flue gas temperature reduction and energy-saving device according to claim 7, characterized in that: the heat exchange tube of the air preheater is plated with enamel, and the air inlet side of the air preheater is enamel-coated. The heat exchange tube is made of ND steel. 如权利要求1所述的一种煤气锅炉空气煤气并联一体化降烟温节能装置，其特征在于：所述空预器采用热管型式，且上侧为空气流程，下层为烟气流程，中间采用隔板隔开，所述空预器的换热管采用翅片管；或者所述空气换热单元采用板式换热型式。A gas boiler air-gas parallel integrated flue gas temperature reduction and energy saving device as claimed in claim 1, characterized in that: the air preheater adopts a heat pipe type, and the upper side is the air flow, the lower layer is the flue gas flow, and the middle adopts the heat pipe type. The partition plates are separated, and the heat exchange tube of the air preheater adopts a finned tube; or the air heat exchange unit adopts a plate heat exchange type.
PCT/CN2021/099377 2020-10-27 2021-06-10 Air and coal gas parallel connection integrated flue gas temperature reducing and energy saving device for coal gas boiler Ceased WO2022088687A1 (en)

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