WO2023077613A1 - Dual-purpose heat exchange system for flue gas reheating and condensation - Google Patents

Dual-purpose heat exchange system for flue gas reheating and condensation Download PDF

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Publication number
WO2023077613A1
WO2023077613A1 PCT/CN2021/137006 CN2021137006W WO2023077613A1 WO 2023077613 A1 WO2023077613 A1 WO 2023077613A1 CN 2021137006 W CN2021137006 W CN 2021137006W WO 2023077613 A1 WO2023077613 A1 WO 2023077613A1
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dual
reheating
purpose heat
pipe
water supply
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French (fr)
Chinese (zh)
Inventor
赵明增
唐晓东
官广成
张周康
王超
王彦东
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Qingdao Enn Energy Co Ltd
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Qingdao Enn Energy 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
    • F23L15/04—Arrangements of recuperators
    • 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 utility model relates to the technical field of boiler flue gas reuse, in particular to a dual-purpose heat exchange system for flue gas reheating and condensation.
  • Gas-fired boilers include gas-fired boiling water boilers, gas-fired hot water boilers, gas-fired steam boilers, and gas-fired power generation boilers.
  • gas-fired boilers In winter, most people choose gas-fired boilers as boiler equipment for steam, heating, and bathing.
  • the simple air preheater can only partially eliminate the condensed water of the flue gas, especially in the cold winter conditions, it cannot realize the whitening of the smoke exhaust, and the reheater consumes a large amount of electric energy, which does not meet the requirements of energy saving.
  • the boiler needs to be constantly filled with fresh air. In cold climates, the temperature of the incoming air is low, which will affect the combustion and cause problems such as insufficient combustion. In order to further improve the boiler exhaust system and realize the whitening of exhaust smoke, it is necessary to further improve the existing smoke exhaust system.
  • the utility model provides a dual-purpose heat exchange system for flue gas reheating and condensation, and the specific technical scheme is as follows.
  • a flue gas reheating and condensing dual-purpose heat exchange system including a gas boiler, a connecting flue, a smoke exhaust channel, an induced draft fan, a dual-purpose heat exchanger, an air pre-air duct, a reheating water supply pipe, and a reheating return water pipe,
  • the gas boiler is connected to the connecting flue, and the connecting flue is connected to the smoke exhaust channel; the upper part of the smoke exhaust channel is provided with a dual-purpose heat exchanger, and the induced draft fan is arranged on the side of the smoke exhaust channel;
  • the dual-purpose heat exchanger It is connected to the induced draft fan and the air pre-air duct, and the reheat water supply pipe and the reheat return water pipe are also connected to the dual-purpose heat exchanger;
  • the gas boiler is connected to the primary network water supply pipe and the primary network return water pipe, and the reheat water supply pipe
  • the pipe is connected to the water supply pipe of the primary network, and the reheat return pipe is connected to the return water pipe of
  • the smoke exhaust channel is arranged vertically, and a sewage drain valve is provided at the bottom of the smoke exhaust channel.
  • the multiple gas-fired boilers are respectively connected through connecting flues and smoke exhaust channels.
  • the bottom of the smoke exhaust channel is in an inverted conical shape.
  • the height of the induced draft fan is flush with that of the dual-purpose heat exchanger, and valves are arranged on the air pre-air duct.
  • the air outlet of the empty pre-air duct is connected to a gas boiler.
  • pipeline valves are respectively arranged on the reheat water supply pipe and the reheat water return pipe.
  • the beneficial effect of the flue gas reheating and condensing dual-purpose heat exchange system is that the gas boiler is connected to the vertically arranged smoke exhaust channel to realize stable smoke exhaust, and the dual-purpose heat exchanger can realize one device with two functions, which can Realize boiler air preheating, and can take into account the needs of flue gas whitening.
  • the system can flexibly adjust the air-cooled air pre-condensation and the balance adjustment of reheating and heat exchange according to the change of outdoor ambient temperature. It has the advantages of flexible adjustment and simple structure.
  • Figure 1 is a schematic structural diagram of a dual-purpose heat exchange system for flue gas reheating and condensation
  • a flue gas reheating and condensation dual-purpose heat exchange system including a gas boiler 1, a connecting flue 2, a smoke exhaust channel 3, an induced draft fan 4, a dual-purpose heat exchanger 5, an air pre-air duct 6, and a reheating water supply pipe 7 and the reheating return pipe 8, the gas boiler burns and heats to provide hot water for the water supply pipe of the primary network.
  • the pre-air channel supplies fresh air to the gas boiler, and the reheating water supply pipe is connected to a dual-purpose heat exchanger.
  • the dual-purpose heat exchanger can heat the flue gas in the smoke exhaust channel and eliminate white smoke.
  • the gas boiler 1 is connected to the connecting flue 2, and the connecting flue 2 is connected to the smoke exhaust channel 3, and condensed water will be formed in the flue gas exhaust channel.
  • the upper part of the smoke exhaust channel 3 is provided with a dual-purpose heat exchanger 5, and the induced draft fan 4 is arranged on the side of the smoke exhaust channel.
  • the dual-purpose heat exchanger 5 is connected to the induced draft fan 4 and the air pre-air duct 6 .
  • the reheat water supply pipe 7 and the reheat return water pipe 8 are also connected with the dual-purpose heat exchanger 5 .
  • the gas boiler 1 is connected to the primary network water supply pipeline 9 and the primary network return water pipeline 10, the reheat water supply pipe 8 is connected to the primary network water supply pipeline, and the reheat return water pipe is connected to the primary network return water pipeline.
  • the smoke exhaust channel 3 is vertically arranged, and the bottom of the smoke exhaust channel 3 is provided with a sewage drain valve 11 to discharge condensed water and residue.
  • multiple dual-purpose heat exchangers 5 and air pre-air ducts 6 may also be provided, and the air pre-air ducts 6 supply gas to multiple gas-fired boilers respectively.
  • the bottom of the smoke exhaust channel 3 can be arranged in an inverted cone shape, so that it is more convenient to collect and discharge condensed water, and the sewage drain valve 11 is arranged at the tip of the inverted cone.
  • the setting height of the induced draft fan 4 is flush with the dual-purpose heat exchanger, and a valve is arranged on the air pre-air duct 4, and the natural wind can be sucked into the dual-purpose heat exchanger through the induced draft fan 4, and the heat of the flue gas can be used to realize the natural wind. preheating.
  • the preheated air is connected to the gas boiler through the air outlet of the air pre-air duct 6, so as to ensure the temperature of the air input into the gas boiler and improve the combustion efficiency.
  • the reheat water supply pipe 7 and the reheat return water pipe 8 are respectively provided with pipeline valves to control the reheat water supply pipe 7 and the reheat return water pipe 8 to supply and return water.
  • the use of the system is as follows: when the gas boiler needs to fill in the preheated air, close the valves on the reheating water supply pipe and the reheating return pipe, the induced draft fan will work, and the induced draft fan will suck the external fresh air into the dual-purpose heat exchanger.
  • the air passes through the internal pipes of the dual-purpose heat exchanger, and the exhausted hot flue gas passes through the external pipes of the dual-purpose heat exchanger, so that the fresh air can be preheated.
  • the gas-fired boiler of this system is connected to the vertically arranged smoke exhaust channel to achieve stable smoke exhaust.
  • the dual-purpose heat exchanger can realize one device with two functions, which can not only realize boiler air preheating, but also take into account the needs of flue gas whitening.
  • the system can According to the change of outdoor ambient temperature, it can flexibly adjust the air-cooled air pre-condensation and the balance adjustment of reheating and heat exchange, which has the advantages of flexible adjustment and simple structure.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Chimneys And Flues (AREA)
  • Air Supply (AREA)

Abstract

A dual-purpose heat exchange system for flue gas reheating and condensation, relating to the technical field of boiler flue gas recycling. The system comprises a gas-fired boiler (1), a connecting flue pipe (2), a fume exhaust channel (3), an induced draft fan (4), a dual-purpose heat exchanger (5), an air preheating duct (6), a reheating water supply pipe (7) and a reheating water return pipe (8); the gas-fired boiler (1) is connected to the connecting flue pipe (2); the connecting flue pipe (2) is communicated with the fume exhaust channel (3); the dual-purpose heat exchanger (5) is provided at the upper part of the fume exhaust channel (3); the induced draft fan (4) is provided on a side surface of the fume exhaust channel (3); a blowdown drain valve (11) is provided at the bottom of the fume exhaust channel (3). The dual-purpose heat exchanger (5) is connected to the induced draft fan (4) and the air preheating duct (6), and the reheating water supply pipe (7) and the reheating water return pipe (8) are also connected to the dual-purpose heat exchanger (5). The gas-fired boiler (1) is connected to a primary network water supply pipeline (9) and a primary network water return pipeline (10), the reheating water supply pipe (7) is connected to the primary network water supply pipeline (9), and the reheating water return pipe (8) is connected to the primary network water return pipeline (10). The system can achieve boiler air preheating, improve the boiler conversion efficiency, eliminate white fume of flue gas, and achieve flexible adjustment.

Description

一种烟气再热冷凝双用型换热系统A dual-purpose heat exchange system for flue gas reheating and condensation 技术领域technical field

本实用新型涉及锅炉烟气再利用技术领域，尤其是一种烟气再热冷凝双用型换热系统。 The utility model relates to the technical field of boiler flue gas reuse, in particular to a dual-purpose heat exchange system for flue gas reheating and condensation.

背景技术Background technique

燃气锅炉包括燃气开水锅炉、燃气热水锅炉、燃气蒸汽锅炉、燃气发电锅炉等，在冬季大多数人们都选择了燃气锅炉作为蒸汽、采暖、洗浴用的锅炉设备。燃气锅炉的烟气排放存在冷凝腐蚀的问题，以及白烟问题。对此单纯的空气预热器只能部分实现烟气冷凝水的消除，尤其是在冬季寒冷的条件下，无法实现排烟消白，并且再热器消耗大量的电能，不符合节能的要求。锅炉在燃烧过程中需要不断充入新鲜空气，在寒冷的气候条件下，由于进入的空气温度较低，会影响燃烧，造成燃烧不充分等问题。为了进一步改善锅炉排气系统，实现排烟消白，需要对现有的排烟系统做进一步的改进。Gas-fired boilers include gas-fired boiling water boilers, gas-fired hot water boilers, gas-fired steam boilers, and gas-fired power generation boilers. In winter, most people choose gas-fired boilers as boiler equipment for steam, heating, and bathing. There are problems of condensation corrosion and white smoke in the flue gas emission of gas-fired boilers. In this regard, the simple air preheater can only partially eliminate the condensed water of the flue gas, especially in the cold winter conditions, it cannot realize the whitening of the smoke exhaust, and the reheater consumes a large amount of electric energy, which does not meet the requirements of energy saving. During the combustion process, the boiler needs to be constantly filled with fresh air. In cold climates, the temperature of the incoming air is low, which will affect the combustion and cause problems such as insufficient combustion. In order to further improve the boiler exhaust system and realize the whitening of exhaust smoke, it is necessary to further improve the existing smoke exhaust system.

技术解决方案technical solution

为了实现锅炉空气预热，提升锅炉转化效率，消除烟气的白烟，本实用新型提供了一种烟气再热冷凝双用型换热系统，具体技术方案如下。In order to realize boiler air preheating, improve boiler conversion efficiency, and eliminate white smoke of flue gas, the utility model provides a dual-purpose heat exchange system for flue gas reheating and condensation, and the specific technical scheme is as follows.

一种烟气再热冷凝双用型换热系统，包括燃气锅炉、连接烟道、排烟通道、引风机、双用换热器、空预风道、再热供水管和再热回水管，所述燃气锅炉与连接烟道相连，连接烟道连通排烟通道；所述排烟通道的上部设置有双用换热器，引风机设置在排烟通道的侧面；所述双用换热器与引风机、空预风道相连，所述再热供水管、再热回水管也与双用换热器相连接；所述燃气锅炉连接一次网供水管道和一次网回水管道，再热供水管和一次网供水管道相连，再热回水管和一次网回水管道相连。A flue gas reheating and condensing dual-purpose heat exchange system, including a gas boiler, a connecting flue, a smoke exhaust channel, an induced draft fan, a dual-purpose heat exchanger, an air pre-air duct, a reheating water supply pipe, and a reheating return water pipe, The gas boiler is connected to the connecting flue, and the connecting flue is connected to the smoke exhaust channel; the upper part of the smoke exhaust channel is provided with a dual-purpose heat exchanger, and the induced draft fan is arranged on the side of the smoke exhaust channel; the dual-purpose heat exchanger It is connected to the induced draft fan and the air pre-air duct, and the reheat water supply pipe and the reheat return water pipe are also connected to the dual-purpose heat exchanger; the gas boiler is connected to the primary network water supply pipe and the primary network return water pipe, and the reheat water supply pipe The pipe is connected to the water supply pipe of the primary network, and the reheat return pipe is connected to the return water pipe of the primary network.

优选的是，排烟通道竖直布置，排烟通道的底部设置有排污泄水阀。Preferably, the smoke exhaust channel is arranged vertically, and a sewage drain valve is provided at the bottom of the smoke exhaust channel.

优选的是，燃气锅炉设置有多个，多个燃气锅炉通分别通过连接烟道和排烟通道相连。Preferably, there are multiple gas-fired boilers, and the multiple gas-fired boilers are respectively connected through connecting flues and smoke exhaust channels.

还优选的是，排烟通道的底部呈倒圆锥形。It is also preferred that the bottom of the smoke exhaust channel is in an inverted conical shape.

还优选的是，引风机的设置高度和双用换热器齐平，所述空预风道上设置有阀门。It is also preferable that the height of the induced draft fan is flush with that of the dual-purpose heat exchanger, and valves are arranged on the air pre-air duct.

还优选的是，空预风道的出风口连接燃气锅炉。It is also preferable that the air outlet of the empty pre-air duct is connected to a gas boiler.

进一步优选的是，再热供水管和再热回水管上分别设置有管道阀门。Further preferably, pipeline valves are respectively arranged on the reheat water supply pipe and the reheat water return pipe.

有益效果Beneficial effect

本发明提供的一种烟气再热冷凝双用型换热系统有益效果是，燃气锅炉连通竖直布置的排烟通道实现稳定排烟，双用换热器可实现一器两用，既能实现锅炉空气预热，又能兼顾烟气消白需求，该系统可以根据室外环境温度变化，灵活调节风冷空预冷凝，以及再热换热的平衡调节，具有调解灵活，结构简单等优点。The beneficial effect of the flue gas reheating and condensing dual-purpose heat exchange system provided by the present invention is that the gas boiler is connected to the vertically arranged smoke exhaust channel to realize stable smoke exhaust, and the dual-purpose heat exchanger can realize one device with two functions, which can Realize boiler air preheating, and can take into account the needs of flue gas whitening. The system can flexibly adjust the air-cooled air pre-condensation and the balance adjustment of reheating and heat exchange according to the change of outdoor ambient temperature. It has the advantages of flexible adjustment and simple structure.

附图说明Description of drawings

图1是烟气再热冷凝双用型换热系统的结构示意图；Figure 1 is a schematic structural diagram of a dual-purpose heat exchange system for flue gas reheating and condensation;

图中：1-燃气锅炉，2-连接烟道，3-排烟通道，4-引风机，5-双用换热器，6-空预风道，7-再热供水管，8-再热回水管，9-一次网供水管道，10-一次网回水管道，11排污泄水阀。In the figure: 1- gas boiler, 2- connecting flue, 3- exhaust channel, 4- induced draft fan, 5- dual-purpose heat exchanger, 6- air pre-air duct, 7- reheating water supply pipe, 8- reheating Heat return pipe, 9-primary network water supply pipe, 10-primary network return water pipe, 11 sewage discharge valve.

本发明的实施方式Embodiments of the present invention

结合图1所示，对本实用新型提供的一种烟气再热冷凝双用型换热系统的具体实施方式进行说明。With reference to Fig. 1, the specific implementation of a flue gas reheating and condensing dual-purpose heat exchange system provided by the utility model will be described.

一种烟气再热冷凝双用型换热系统，包括燃气锅炉1、连接烟道2、排烟通道3、引风机4、双用换热器5、空预风道6、再热供水管7和再热回水管8，燃气锅炉燃烧加热为一次网供水管道提供热水，连接烟道和排烟通道可以实现顺利的排烟，引风机从外界吸入新鲜空气导入双用换热器，空预风道向燃气锅炉补入新鲜空气，再热供水管连接双用换热器，双用换热器可以加热排烟通道内的烟气，消除白烟。燃气锅炉1与连接烟道2相连，连接烟道2连通排烟通道3，烟气排烟通道内会形成冷凝水。排烟通道3的上部设置有双用换热器5，引风机4设置在排烟通道的侧面。双用换热器5与引风机4、空预风道6相连。再热供水管7、再热回水管8也与双用换热器5相连接。燃气锅炉1连接一次网供水管道9和一次网回水管道10，再热供水管8和一次网供水管道相连，再热回水管和一次网回水管道相连。A flue gas reheating and condensation dual-purpose heat exchange system, including a gas boiler 1, a connecting flue 2, a smoke exhaust channel 3, an induced draft fan 4, a dual-purpose heat exchanger 5, an air pre-air duct 6, and a reheating water supply pipe 7 and the reheating return pipe 8, the gas boiler burns and heats to provide hot water for the water supply pipe of the primary network. The pre-air channel supplies fresh air to the gas boiler, and the reheating water supply pipe is connected to a dual-purpose heat exchanger. The dual-purpose heat exchanger can heat the flue gas in the smoke exhaust channel and eliminate white smoke. The gas boiler 1 is connected to the connecting flue 2, and the connecting flue 2 is connected to the smoke exhaust channel 3, and condensed water will be formed in the flue gas exhaust channel. The upper part of the smoke exhaust channel 3 is provided with a dual-purpose heat exchanger 5, and the induced draft fan 4 is arranged on the side of the smoke exhaust channel. The dual-purpose heat exchanger 5 is connected to the induced draft fan 4 and the air pre-air duct 6 . The reheat water supply pipe 7 and the reheat return water pipe 8 are also connected with the dual-purpose heat exchanger 5 . The gas boiler 1 is connected to the primary network water supply pipeline 9 and the primary network return water pipeline 10, the reheat water supply pipe 8 is connected to the primary network water supply pipeline, and the reheat return water pipe is connected to the primary network return water pipeline.

排烟通道3竖直布置，排烟通道3的底部设置有排污泄水阀11，排出冷凝水和残渣。The smoke exhaust channel 3 is vertically arranged, and the bottom of the smoke exhaust channel 3 is provided with a sewage drain valve 11 to discharge condensed water and residue.

本实施例的另一变形例中燃气锅炉1设置有多个，多个燃气锅炉1通分别通过连接烟道2和排烟通道3相连，多个燃气锅炉1公用1个排烟通道实现排烟。多个燃气锅炉1设置时也可以设置多个双用换热器5和空预风道6，空预风道6分别为多个燃气锅炉供气。In another modified example of this embodiment, there are multiple gas boilers 1, and the multiple gas boilers are connected through the connecting flue 2 and the smoke exhaust channel 3 respectively, and the multiple gas boilers 1 share one smoke exhaust channel to realize smoke exhaust. . When multiple gas-fired boilers 1 are installed, multiple dual-purpose heat exchangers 5 and air pre-air ducts 6 may also be provided, and the air pre-air ducts 6 supply gas to multiple gas-fired boilers respectively.

排烟通道3的底部可以呈倒圆锥形布置，从而更加方便的收集排出冷凝水，排污泄水阀11设置在倒圆锥的尖端位置。引风机4的设置高度和双用换热器齐平，空预风道4上设置有阀门，通过引风机4可以将自然风吸入双用换热器中，利用烟气的热量可以实现自然风的预热。预热后的空气经过空预风道6的出风口连接燃气锅炉，从而保证输入燃气锅炉的空气温度，提高燃烧效率。再热供水管7和再热回水管8上分别设置有管道阀门，控制再热供水管7和再热回水管8供水和回水。The bottom of the smoke exhaust channel 3 can be arranged in an inverted cone shape, so that it is more convenient to collect and discharge condensed water, and the sewage drain valve 11 is arranged at the tip of the inverted cone. The setting height of the induced draft fan 4 is flush with the dual-purpose heat exchanger, and a valve is arranged on the air pre-air duct 4, and the natural wind can be sucked into the dual-purpose heat exchanger through the induced draft fan 4, and the heat of the flue gas can be used to realize the natural wind. preheating. The preheated air is connected to the gas boiler through the air outlet of the air pre-air duct 6, so as to ensure the temperature of the air input into the gas boiler and improve the combustion efficiency. The reheat water supply pipe 7 and the reheat return water pipe 8 are respectively provided with pipeline valves to control the reheat water supply pipe 7 and the reheat return water pipe 8 to supply and return water.

系统的使用具体是：当燃气锅炉需要补入预热的空气时，关闭再热供水管和再热回水管上的阀门，引风机工作，引风机将外部新鲜空气吸入双用换热器，新鲜空气通过双用换热器内部的管道，排放的热烟气通过双用换热器外部的管道，从而可以实现新鲜空气的预热，预热后的同期经过空预风道补入燃气锅炉。当需要消除白烟时，打开再热供水管和再热回水管上的阀门，关闭引风机和空预风道上的阀门，再热供水管向双用换热器供水，双用换热器可以实现对排放烟气的二次加热，从而消除白烟。The use of the system is as follows: when the gas boiler needs to fill in the preheated air, close the valves on the reheating water supply pipe and the reheating return pipe, the induced draft fan will work, and the induced draft fan will suck the external fresh air into the dual-purpose heat exchanger. The air passes through the internal pipes of the dual-purpose heat exchanger, and the exhausted hot flue gas passes through the external pipes of the dual-purpose heat exchanger, so that the fresh air can be preheated. When it is necessary to eliminate white smoke, open the valves on the reheat water supply pipe and the reheat return water pipe, close the valves on the induced draft fan and the air pre-air duct, and the reheat water supply pipe supplies water to the dual-purpose heat exchanger, and the dual-purpose heat exchanger can Realize the secondary heating of exhaust flue gas, so as to eliminate white smoke.

该系统的燃气锅炉连通竖直布置的排烟通道实现稳定排烟，双用换热器可实现一器两用，既能实现锅炉空气预热，又能兼顾烟气消白需求，该系统可以根据室外环境温度变化，灵活调节风冷空预冷凝，以及再热换热的平衡调节，具有调解灵活，结构简单等优点。The gas-fired boiler of this system is connected to the vertically arranged smoke exhaust channel to achieve stable smoke exhaust. The dual-purpose heat exchanger can realize one device with two functions, which can not only realize boiler air preheating, but also take into account the needs of flue gas whitening. The system can According to the change of outdoor ambient temperature, it can flexibly adjust the air-cooled air pre-condensation and the balance adjustment of reheating and heat exchange, which has the advantages of flexible adjustment and simple structure.

当然，上述说明并非是对本实用新型的限制，本实用新型也并不仅限于上述举例，本技术领域的技术人员在本实用新型的实质范围内所做出的变化、改型、添加或替换，也应属于本实用新型的保护范围。Of course, the above description is not a limitation of the present utility model, and the present utility model is not limited to the above-mentioned examples, and changes, modifications, additions or replacements made by those skilled in the art within the essential scope of the present utility model are also acceptable. Should belong to the protection scope of the utility model.

Claims (7)

一种烟气再热冷凝双用型换热系统，其特征在于，包括燃气锅炉、连接烟道、排烟通道、引风机、双用换热器、空预风道、再热供水管和再热回水管，所述燃气锅炉与连接烟道相连，连接烟道连通排烟通道；所述排烟通道的上部设置有双用换热器，引风机设置在排烟通道的侧面；所述双用换热器与引风机、空预风道相连，所述再热供水管、再热回水管也与双用换热器相连接；所述燃气锅炉连接一次网供水管道和一次网回水管道，再热供水管和一次网供水管道相连，再热回水管和一次网回水管道相连。A flue gas reheating and condensing dual-purpose heat exchange system is characterized in that it includes a gas boiler, a connecting flue, a smoke exhaust channel, an induced draft fan, a dual-purpose heat exchanger, an air pre-air duct, a reheating water supply pipe, and a reheating water supply pipe. The heat return pipe, the gas boiler is connected with the connecting flue, and the connecting flue is connected to the smoke exhaust channel; the upper part of the smoke exhaust channel is provided with a dual-purpose heat exchanger, and the induced draft fan is arranged on the side of the smoke exhaust channel; The heat exchanger is connected with the induced draft fan and the air pre-air duct, and the reheat water supply pipe and the reheat return water pipe are also connected with the dual-purpose heat exchanger; the gas boiler is connected with the primary network water supply pipe and the primary network return water pipe , the reheating water supply pipe is connected to the water supply pipe of the primary network, and the reheating water return pipe is connected to the return water pipe of the primary network. 根据权利要求1所述的一种烟气再热冷凝双用型换热系统，其特征在于，所述排烟通道竖直布置，排烟通道的底部设置有排污泄水阀。The flue gas reheating and condensing dual-purpose heat exchange system according to claim 1, wherein the smoke exhaust channel is vertically arranged, and a sewage drain valve is provided at the bottom of the smoke exhaust channel. 根据权利要求1所述的一种烟气再热冷凝双用型换热系统，其特征在于，所述燃气锅炉设置有多个，多个燃气锅炉通分别通过连接烟道和排烟通道相连。The flue gas reheating and condensing dual-purpose heat exchange system according to claim 1, characterized in that there are multiple gas-fired boilers, and the multiple gas-fired boilers are respectively connected through connecting flues and smoke exhaust channels. 根据权利要求3所述的一种烟气再热冷凝双用型换热系统，其特征在于，所述排烟通道的底部呈倒圆锥形。The flue gas reheating and condensing dual-purpose heat exchange system according to claim 3, wherein the bottom of the smoke exhaust channel is in an inverted conical shape. 根据权利要求4所述的一种烟气再热冷凝双用型换热系统，其特征在于，所述引风机的设置高度和双用换热器齐平，所述空预风道上设置有阀门。The flue gas reheating and condensing dual-purpose heat exchange system according to claim 4, characterized in that, the installation height of the induced draft fan is flush with the dual-purpose heat exchanger, and the air pre-air duct is provided with a valve . 根据权利要求1所述的一种烟气再热冷凝双用型换热系统，其特征在于，所述空预风道的出风口连接燃气锅炉。The flue gas reheating and condensing dual-purpose heat exchange system according to claim 1, wherein the air outlet of the air pre-air duct is connected to a gas boiler. 根据权利要求1所述的一种烟气再热冷凝双用型换热系统，其特征在于，所述再热供水管和再热回水管上分别设置有管道阀门。The flue gas reheating and condensing dual-purpose heat exchange system according to claim 1, wherein the reheating water supply pipe and the reheating return water pipe are respectively provided with pipe valves.
PCT/CN2021/137006 2021-11-04 2021-12-10 Dual-purpose heat exchange system for flue gas reheating and condensation Ceased WO2023077613A1 (en)

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