WO2020029501A1 - 一种防冷凝燃气壁挂炉及其防冷凝方法 - Google Patents

一种防冷凝燃气壁挂炉及其防冷凝方法 Download PDF

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WO2020029501A1
WO2020029501A1 PCT/CN2018/121293 CN2018121293W WO2020029501A1 WO 2020029501 A1 WO2020029501 A1 WO 2020029501A1 CN 2018121293 W CN2018121293 W CN 2018121293W WO 2020029501 A1 WO2020029501 A1 WO 2020029501A1
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gas
temperature
valve
wall
water
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PCT/CN2018/121293
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English (en)
French (fr)
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张霞
郭特特
陈佳峰
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珠海格力电器股份有限公司
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Publication of WO2020029501A1 publication Critical patent/WO2020029501A1/zh

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H8/00—Fluid heaters characterised by means for extracting latent heat from flue gases by means of condensation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/0005—Details for water heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/18—Arrangement or mounting of grates or heating means
    • F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
    • F24H9/1832—Arrangement or mounting of combustion heating means, e.g. grates or burners
    • F24H9/1836—Arrangement or mounting of combustion heating means, e.g. grates or burners using fluid fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
    • F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]

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  • the present disclosure relates to the field of gas-fired heating equipment, and in particular, to an anti-condensation gas wall-hung boiler and an anti-condensation method thereof.
  • Gas wall-hung boilers are increasingly accepted by customers and have become an important part of household heating in the north.
  • the largest non-condensing gas wall-hung boiler in the market has a gap of more than 5% in thermal efficiency between the minimum load and the maximum load. The reason is that when the load is small, because the fan does not change speed, too much excess air brings out a lot of heat.
  • the present disclosure provides an anti-condensation gas-hung boiler and a method for preventing condensation thereof.
  • An anti-condensation gas-fired wall-hanging furnace includes a heat exchanger and a heat exchange pipe passing through the heat exchanger, and further includes at least one shunt pipe and an electric valve.
  • the electric valve is arranged outside the heat exchanger, and two ends of the shunt tube are connected in parallel with the heat exchange tubes at the two ends of the heat exchanger, respectively.
  • a detection device is further included, and the detection device is signal-connected to the electric valve for detecting a load working state of the gas wall-mounted boiler and controlling opening and closing of the electric valve.
  • a burner and a gas valve are arranged below the heat exchanger, the burner burns gas to generate high-temperature flue gas, and the gas valve regulates the combustion power of the burner.
  • the detection device is a gas valve opening detection device, and the gas valve opening detection device detects an opening range of the gas valve.
  • the detection device is one or more of a flame temperature detection device or a flame electron flow detection device connected to a burner.
  • the heat exchange pipe includes a water inlet end and a water outlet end, the water inlet end is connected with a circulation pump, and the water outlet end is used for connecting a radiator that radiates the heat of the water in the heat exchange tube to the room.
  • the heat exchange tube is connected to a circulation pump through a radiator to form a circulating water path.
  • the detection device is a water outlet temperature detection device, and the water outlet temperature detection device detects a water outlet temperature at a water end.
  • a smoke collecting hood and a fan are provided above the heat exchanger, the fan is provided on the smoke collecting hood, the smoke collecting hood is provided with a smoke exhaust port, and the fan outlet is directly opposite the smoke exhaust mouth.
  • the detection device is a smoke exhaust temperature detection device, and the smoke exhaust temperature detection device detects a smoke temperature of a smoke exhaust port.
  • the electric valve is an electric shut-off valve.
  • the electric valve is an electric regulating valve.
  • the present disclosure also provides the above-mentioned anti-condensation method for a gas wall-hung boiler, the method comprising:
  • the electric valve is an electric shut-off valve, and the valve port of the electric shut-off valve is opened under a light load working state, and the valve port of the electric shut-off valve is closed under a heavy load working state.
  • the electric valve is an electric regulating valve, and the valve port of the electric regulating valve is increased in a low-load working state, and the valve port of the electric shut-off valve is reduced in a high-load working state.
  • the determination condition is a range of the opening degree of the gas valve. If the opening degree is less than 1/3 of the total opening degree, it is determined that the gas wall-hung boiler is in a low-load working state, otherwise it is a high-load working state.
  • the determination condition is the outlet temperature at the water outlet.
  • the outlet temperature is detected to be lower than the first predetermined temperature, it is determined that the gas wall-hung boiler is in a low-load working state.
  • the outlet temperature is detected to be higher than the second predetermined temperature, When the temperature is reached, it is determined that the gas-fired wall-hung boiler is in a heavy-load working state.
  • the first predetermined temperature is in a range of 30 to 45 ° C; or, the second predetermined temperature is in a range of 45 to 60 ° C.
  • the determination condition is a flame temperature.
  • the flame temperature is detected to be lower than a preset value, it is determined that the gas wall-hung boiler is in a low-load working state.
  • the flame temperature is detected to be higher than a preset value, That is, it is determined that the gas-fired wall-hung boiler is in a high-load working state.
  • the determination condition is a flame electron flow.
  • the flame electron flow is detected to be lower than a preset value, it is determined that the gas wall-hung boiler is in a low-load working state.
  • the flame temperature is detected to be higher than a certain Set the value, that is, determine that the gas wall-hung boiler is in a large load working state.
  • the determination condition is the temperature of the flue gas.
  • the flue gas temperature is detected to be lower than a preset value, it is determined that the gas wall-hung boiler is in a low-load working state.
  • a preset value that is, to judge that the gas wall-hung boiler is in a heavy load working state.
  • the gas-fired wall-mounted boiler of the present disclosure adds shunt tubes at both ends of the heat exchanger, and an electric valve is provided on the shunt tube to allow the electric valve to open the flow path of the shunt tube.
  • an electric valve is provided on the shunt tube to allow the electric valve to open the flow path of the shunt tube.
  • the final water outlet is a mixture of cold water and hot water, so the temperature of the water flowing through the heat exchanger needs to be higher than the water outlet temperature.
  • the flue gas temperature will be higher than when there is no split.
  • the temperature of the water vapor in the flue gas is higher than the condensation temperature, so no condensation occurs.
  • an electric shut-off valve or an electric regulating valve is provided on the shunt pipe.
  • the valve opening of the electric shut-off valve is opened or the valve opening of the electric regulating valve is enlarged, so that a part of the water flows from the shunt pipe.
  • the heat absorbed by the low-temperature water in the flue gas is reduced, and the temperature of the flue gas is increased.
  • the temperature of the water outlet is constant, the water flow is used. It is a mixture of cold water and hot water, so the temperature of the water flowing through the heat exchanger needs to be higher than the temperature of the water outlet.
  • FIG. 1 is a schematic structural diagram of an anti-condensation gas wall-hung boiler in an embodiment of the present disclosure
  • FIG. 2 is a schematic structural diagram of a circulating water channel in an embodiment of the present disclosure
  • FIG. 3 is a schematic diagram of a connection between a detection device and an electric valve according to an embodiment of the present disclosure
  • FIG. 4 is a schematic structural diagram of a circulating water channel in another embodiment of the present disclosure.
  • FIG. 5 is a partial structural schematic diagram of another embodiment of the present disclosure.
  • an anti-condensing gas wall-hung boiler includes a heat exchanger 1 and heat exchange tubes 2 passing through the heat exchanger 1.
  • the anti-condensing gas wall-mounted boiler further includes at least one branch pipe 3 and an electric valve 31 provided on the branch pipe 3.
  • the shunt tube 3 is disposed outside the heat exchanger 1, and two ends of the shunt tube 3 are respectively connected to the heat exchange tubes 2 at both ends of the heat exchanger 1 in parallel.
  • a burner 4 and a gas valve are arranged below the heat exchanger 1. The gas valve regulates the combustion power of the burner 4.
  • a smoke collecting hood 5 and a fan 6 are arranged above the heat exchanger 1. The fan 6 is disposed on the smoke collecting hood 5.
  • the smoke collecting hood 5 is provided with a smoke exhaust port 51.
  • the air outlet of the fan 6 is directly opposite the smoke exhaust port 51.
  • the heat exchange tube 2 includes a water inlet end 21 and a water outlet end 22.
  • a circulating pump 7 is connected to the water inlet end 21, and a radiator 8 is provided at the water outlet end 22.
  • the heat exchange tube 2 is connected to a circulation pump 7 through a radiator 8 to form a circulating water channel.
  • the anti-condensing gas wall-hung boiler also includes a detection device 9 which is signal-connected to the electric valve 31 and is used to detect the load working state of the gas wall-hung boiler and control the opening and closing of the electric valve 31.
  • the detection device 9 is a gas valve opening degree detection device.
  • the gas valve opening degree detection device detects an opening range of the gas valve.
  • the electric valve 31 is an electric shut-off valve.
  • the burner 4 burns gas to generate a large amount of high-temperature flue gas, and the flue gas contains a large amount of water vapor.
  • the high-temperature flue gas passes through the cold water in the heat exchanger 1 and the heat exchange pipe 2, which heats the cold water in the heat exchange pipe 2, and the flue gas It is collected in the smoke collecting hood 5 and is quickly discharged from the smoke exhaust port 51 by the fan 6.
  • the water in the heat exchange tube 2 flows through the heat exchanger 1 under the action of the circulation pump 7 to exchange heat with the high temperature flue gas.
  • the cold water is heated to hot water, and then flows through the radiator 8 to dissipate the heat into the room.
  • the radiated hot water becomes cold, and then flows back to the circulation pump 7 to continuously circulate to heat the indoor air.
  • the flue gas contains a large amount of water vapor
  • the heat exchanged with the cold water through the heat exchanger 1 is excessive, the temperature of the flue gas may be lower than the condensation temperature, and a condensation phenomenon may occur.
  • the gas-fired wall-hung boiler is in a low-load working state, since the combustion power of the burner 4 is small, the amount and temperature of the flue gas are small, so it is easy to cause condensation during the heat exchange process.
  • the present disclosure also provides the anti-condensation method of the gas-fired wall-hung boiler, which is:
  • the opening degree detection device of the gas valve is used to detect the opening degree of the gas valve to determine the load working state of the gas wall-mounted boiler. If the opening degree is lower than 1/3 of the total opening degree, it is determined that the gas wall-mounted furnace is in a low-load working state, and vice versa Heavy load working condition.
  • the detection device 9 is a water outlet temperature detection device, the water outlet temperature detection device detects a water outlet temperature of the water end 22, and the water outlet temperature detection device may be a temperature set at the water outlet end 22 sensor.
  • the load working state of the gas wall-mounted boiler is determined. If the water outlet temperature is lower than 45 ° C, it is determined that the gas wall-mounted boiler is in a low-load working state. When the water outlet temperature is higher than 45 ° C, the gas Wall-hung boilers are under heavy load.
  • the detection method of this embodiment is more accurate than the first embodiment, but the structure is more complicated than that of the first embodiment. This embodiment can also achieve good results on a gas water heater.
  • the detection device 9 is a flame temperature detection device connected to the burner 4.
  • the judgment condition for judging the load working state of the gas wall-hung boiler is flame temperature.
  • a preset value it is judged that the gas wall-hung boiler is in a low-load operation state.
  • Value the gas wall-hung boiler is in a state of heavy load operation.
  • the detection device 9 is a flame electron flow detection device connected to the burner 4.
  • the judgment condition for judging the load working state of the gas wall-hung boiler is flame electron flow.
  • the flame electron flow is detected to be lower than a preset value, it is determined that the gas wall-hung boiler is in a low-load working state.
  • the flame temperature is detected to be higher than a certain value, By default, the gas wall-hung boiler is in a heavy-load working state.
  • the detection device 9 is a smoke exhaust temperature detection device, the smoke exhaust temperature detection device detects a smoke temperature of the smoke exhaust port 51, and the smoke exhaust temperature detection device may be a temperature provided at the smoke exhaust port 51 sensor.
  • the judgment condition for judging the load working state of the gas wall-hung boiler is the temperature of the flue gas.
  • a preset value it is judged that the gas wall-hung boiler is in a low-load working state.
  • a certain preset value the gas wall-hung boiler is in a heavy load working state.
  • the gas wall-mounted boiler has two diverter pipes 3.
  • the flexibility of the gas wall-hung boiler of the present disclosure can be improved, and the adjustable range of the gas wall-hung boiler of the present disclosure can be made wider.
  • the electric valve 31 is an electric regulating valve. In a low-load operating state, the valve opening of the electric regulating valve is increased, and in a high-load operating state, the valve opening of the electric shut-off valve is reduced.
  • the use of an electric control valve can flexibly adjust the water flow rate through the diverter pipe 3 according to the detection information of the detection device 9, which can improve the accuracy of the gas wall-hung boiler of the present disclosure, and at the same time, make the gas wall-hung boiler of the present disclosure more adjustable. .
  • the gas-fired wall-mounted boiler of the present disclosure adds shunt pipes 3 at both ends of the heat exchanger 1, and an electric valve 31 is provided on the shunt pipe 3, so that the electric valve 31 opens the flow path of the shunt pipe 3, and a part of the water flows from the shunt pipe 3.
  • the heat absorbed by the low-temperature water in the flue gas is reduced, and the temperature of the flue gas is increased.
  • the temperature of the water outlet 22 is constant, the water flow is used, so the final water
  • the end 22 is a mixture of cold water and hot water, so the temperature of the water flowing through the heat exchanger 1 needs to be higher than the temperature of the outlet end 22, so that when the set temperature of the unit is the same, the flue gas temperature will be higher than when there is no split, under this dual effect , So that the temperature of the water vapor in the flue gas is higher than the condensation temperature, so no condensation occurs.
  • the electric valve 31 close the flow path of the diverter pipe 3 to increase the flow of water through the main heat exchanger 1 and improve thermal efficiency.

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Abstract

本公开涉及燃气供热设备领域，特别涉及到一种防冷凝燃气壁挂炉及其防冷凝方法。该种防冷凝燃气壁挂炉，包括换热器以及穿过换热器的换热管，还包括至少一条分流管和电动阀，所述分流管设于换热器外、且分流管的两端分别与换热器两端的换热管并接，所述电动阀设置于分流管上。本公开的燃气壁挂炉在换热器两端增设了分流管，并在分流管上设有电动阀，让电动阀开启分流管流道，使一部分水从分流管流过，以减少通过换热器的水流量，烟气被低温水吸收的热量减少，烟气的温度升高，使烟气中的水蒸气的温度高于冷凝温度，因此不会发生冷凝现象，当处于大负荷工作状态，让电动阀关闭分流管流道，以增加通过主换热器的水流量，提高热效率。

Description

一种防冷凝燃气壁挂炉及其防冷凝方法
相关申请
本申请是以申请号为201810886236.8，申请日为2018年8月6日，发明名称为“一种防冷凝燃气壁挂炉及其防冷凝方法”的中国专利申请为基础，并主张其优先权，该中国专利申请的公开内容在此作为整体引入本申请中。
技术领域
本公开涉及燃气供热设备领域，特别涉及到一种防冷凝燃气壁挂炉及其防冷凝方法。
背景技术
燃气壁挂炉越来越多的为广大用户所接受，已经成为北方家庭采暖的重要组成部分。然而目前市场上使用量最大的非冷凝燃气壁挂炉，存在着最小负荷与最大负荷在热效率方面存在5％以上差距的现象。究其原因，是因为小负荷时，由于风机不变速，过多的过剩空气带出了大量的热量。
采暖过程中，机组多数时间是运行在小负荷阶段，所以提高小负荷阶段的热效率可以减少能源浪费。目前传统的机型做法只有两条方案：增加主换热器换热能力，降低烟温，减少热散失；降低过剩空气系数，减少烟量。但是两者都有缺陷，前者烟温降低，小负荷时，烟温很容易到冷凝温度。后者过剩空气减少，烟气冷凝温度增加，小负荷时，烟温也很容易到冷凝温度，这样使得燃烧过后，部分烟气在主换热器上发生了冷凝现象，进而腐蚀主换热器。
另外，即使不进行小负荷热效提升，当机组运行在零下20℃时，由于进气温度低，也会使小负荷功率下，烟罩局部区域烟气也会出现冷凝现象。如此，极大的限制了壁挂炉的使用区域。我国广大的地区如东北，西北地区，有大量使用燃气壁挂炉的需要，大多数燃气壁挂炉存在小负荷冷凝腐蚀问题。
发明内容
为解决上述燃气壁挂炉容易出现的冷凝腐蚀问题，本公开提供了一种防冷凝燃气壁挂炉及其防冷凝方法。
为实现上述目的，本公开的技术方案如下：一种防冷凝燃气壁挂炉，包括换热器以及穿过换热器的换热管，还包括至少一条分流管和电动阀，所述分流管设于换热器外、且分流管的两端分别与换热器两端的换热管并接，所述电动阀设置于分流管上。
在一些实施例中，还包括检测装置，该检测装置与电动阀信号连接，用于检测燃气壁挂炉的负荷工作状态并控制电动阀的启闭。
在一些实施例中，所述换热器下方设置有燃烧器与燃气阀，所述燃烧器燃烧燃气产生高温烟气，所述燃气阀调节燃烧器的燃烧功率。
在一些实施例中，所述检测装置为燃气阀开度检测装置，该燃气阀开度检测装置检测燃气阀的开度范围。
在一些实施例中，所述检测装置为与燃烧器连接的火焰温度检测装置或火焰电子流检测装置中的一种或者多种。
在一些实施例中，所述换热管包括进水端、出水端，所述进水端连接有循环泵，所述出水端用于连接将换热管中水的热量散发到室内的暖气片以使所述换热管通过暖气片与循环泵连接形成循环水路。
在一些实施例中，所述检测装置为出水温度检测装置，所述出水温度检测装置检测出水端的出水温度。
在一些实施例中，所述换热器上方设置有集烟罩与风机，所述风机设置于集烟罩上，所述集烟罩设置有排烟口，所述风机出风口正对排烟口。
在一些实施例中，所述检测装置为排烟温度检测装置，所述排烟温度检测装置检测排烟口的烟气温度。
在一些实施例中，所述电动阀为电动截止阀。
在一些实施例中，所述电动阀为电动调节阀。
本公开还提供上述燃气壁挂炉的防冷凝方法，该方法包括：
检测燃气壁挂炉的负荷工作状态，并根据判断条件进行判断；
当处于小负荷工作状态，让电动阀开启分流管流道，使一部分水从分流管流过，以减少通过换热器的水流量，烟气被低温水吸收的热量减少，烟气的温度升高，使烟气中的水蒸气的温度高于冷凝温度；
当处于大负荷工作状态，让电动阀关闭分流管流道，以增加通过换热器的水流量，提高热效率。
在一些实施例中，所述电动阀为电动截止阀，小负荷工作状态下，开启电动截止 阀的阀口，大负荷工作状态下，关闭电动截止阀的阀口。
在一些实施例中，所述电动阀为电动调节阀，小负荷工作状态下，增大电动调节阀的阀口，大负荷工作状态下，减小电动截止阀的阀口。
在一些实施例中，所述判断条件为燃气阀的开度范围，若开度低于总开度的1/3，即判定燃气壁挂炉处于小负荷工作状态，反之为大负荷工作状态。
在一些实施例中，所述判断条件为出水端的出水温度，当检测到出水温度低于第一预定温度时，即判定燃气壁挂炉处于小负荷工作状态，当检测到出水温度高于第二预定温度时，即判定燃气壁挂炉处于大负荷工作状态。
在一些实施例中，所述第一预定温度在30～45℃范围内；或，所述第二预定温度在45～60℃范围内。
在一些实施例中，所述判断条件为火焰温度，当检测到火焰温度低于某个预设值，即判定燃气壁挂炉处于小负荷工作状态，当检测到火焰温度高于某个预设值，即判定燃气壁挂炉处于大负荷工作状态。
在一些实施例中，所述判断条件为火焰电子流，当检测到火焰电子流低于某个预设值，即判定燃气壁挂炉处于小负荷工作状态，当检测到火焰温度高于某个预设值，即判定燃气壁挂炉处于大负荷工作状态。
在一些实施例中，所述判断条件为烟气温度大小，当检测到烟气温度低于某个预设值，即判定燃气壁挂炉处于小负荷工作状态，当检测到烟气温度高于某个预设值，即判定燃气壁挂炉处于大负荷工作状态。
由上述对本公开的描述可知，与现有技术相比，本公开的燃气壁挂炉在换热器两端增设了分流管，并在分流管上设有电动阀，让电动阀开启分流管流道，使一部分水从分流管流过，以减少通过换热器的水流量，烟气被低温水吸收的热量减少，烟气的温度升高，同时，在出水端温度一定的情况下，采用水分流，那么最后的出水端是冷水和热水混合，所以流经换热器的水温需要高于出水端温度，这样在机组设定温度相同时，烟气温度会比没分流时高，在这双重作用下，使烟气中的水蒸气的温度高于冷凝温度，因此不会发生冷凝现象。当处于大负荷工作状态，让电动阀关闭分流管流道，以增加通过主换热器的水流量，提高热效率。
在一些实施例中，在分流管上设有电动截止阀或电动调节阀，在小负荷工作状态下，开启电动截止阀的阀口或增大电动调节阀的阀口，使一部分水从分流管流过，以减少通过换热器的水流量，烟气被低温水吸收的热量减少，烟气的温度升高，同时， 在出水口温度一定的情况下，采用水分流，那么最后的出水口是冷水和热水混合，所以流经换热器的水温需要高于出水口温度，这样在机组设定温度相同时，烟气温度会比没分流时高，在这双重作用下，使烟气中的水蒸气的温度高于冷凝温度，因此不会发生冷凝现象，当处于大负荷工作状态，关闭电动截止阀的阀口或减小电动调节阀的阀口，以增加通过主换热器的水流量，提高热效率。
附图说明
图1为本公开一实施例中防冷凝燃气壁挂炉的结构示意图；
图2为本公开一实施例中循环水路的结构示意图；
图3为本公开一实施例中检测装置与电动阀连接示意图；
图4为本公开另一实施例中循环水路的结构示意图；
图5为本公开另一实施例的部分结构示意图。
实施方式
下面将结合本公开实施例中的附图，对本公开中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅是本公开的一部分实施例，而不是全部的实施例。
在一些实施例中，参照图1、2、3所示，一种防冷凝燃气壁挂炉包括换热器1以及穿过换热器1的换热管2。防冷凝燃气壁挂炉还包括至少一条分流管3和设置于分流管3上的电动阀31。所述分流管3设于换热器1外、且分流管3的两端分别与换热器1两端的换热管2并接。所述换热器1下方设置有燃烧器4与燃气阀。所述燃气阀调节燃烧器4的燃烧功率。所述换热器1上方设置有集烟罩5与风机6。所述风机6设置于集烟罩5上。所述集烟罩5设置有排烟口51。所述风机6出风口正对排烟口51。所述换热管2包括进水端21、出水端22。所述进水端21连接有循环泵7，所述出水端22设置有暖气片8。所述换热管2通过暖气片8与循环泵7连接，形成循环的水路。该种防冷凝燃气壁挂炉还包括检测装置9，该检测装置9与电动阀31信号连接，用于检测燃气壁挂炉的负荷工作状态并控制电动阀31的启闭。检测装置9为燃气阀开度检测装置，该燃气阀开度检测装置检测燃气阀的开度范围，所述电动阀31为电动截止阀。
燃烧器4燃烧燃气产生大量高温烟气，烟气中含有大量水蒸气，高温烟气经过换热器1与换热管2中的冷水换热，即对换热管2的冷水加热，烟气在集烟罩5中汇集 并通过风机6快速从排烟口51排出。
换热管2中的水在循环泵7的作用下，先流过换热器1，与高温烟气换热，冷水被加热成热水，然后流过暖气片8将热量散发到室内，被散热的热水变冷，再重新流回循环泵7，不断循环，对室内空气加热。在循环过程中，由于烟气中含有大量水蒸气，若通过换热器1与冷水交换的热量过多，烟气的温度可能低于冷凝温度，进而发生冷凝现象。特别是在燃气壁挂炉处于小负荷工作状态时，由于燃烧器4的燃烧功率小，烟气的量与温度就小，因此很容易在换热过程中发生冷凝现象。
本公开还提供上述燃气壁挂炉的防冷凝方法，该方法为：
检测燃气壁挂炉的负荷工作状态，并根据判断条件进行判断；当处于小负荷工作状态，让电动截止阀开启分流管3流道，使一部分水从分流管3流过，以减少通过换热器1的水流量，烟气被低温水吸收的热量减少，烟气的温度升高，使烟气中的水蒸气的温度高于冷凝温度，因此不会发生冷凝现象；当处于大负荷工作状态，让电动截止阀关闭分流管3流道，以增加通过换热器1的水流量，提高热效率。
通过燃气阀开度检测装置检测燃气阀的开度大小，判定燃气壁挂炉的负荷工作状态，若开度低于总开度的1/3，即判定燃气壁挂炉处于小负荷工作状态，反之为大负荷工作状态。
参照图4所示，在一些实施例中，所述检测装置9为出水温度检测装置，所述出水温度检测装置检测出水端22的出水温度，出水温度检测装置可为设置于出水端22的温度传感器。
通过检测出水端22的出水温度大小，判定燃气壁挂炉的负荷工作状态，若出水温度低于45℃，即判定燃气壁挂炉处于小负荷工作状态，当监测到出水温度高于45℃时，燃气壁挂炉处于大负荷工作状态。
本实施例的检测方法比实施例一更准确，但是结构比实施例一较为复杂，本实施例在燃气热水器上也能取得很好的效果。
在一些实施例中，所述检测装置9为与燃烧器4连接的火焰温度检测装置。
判定燃气壁挂炉的负荷工作状态的判断条件为火焰温度，当检测到火焰温度低于某个预设值，即判定燃气壁挂炉处于小负荷工作状态，当检测到火焰温度高于某个预设值，燃气壁挂炉处于大负荷工作状态。
在一些实施例中，所述检测装置9为与燃烧器4连接的火焰电子流检测装置。
判定燃气壁挂炉的负荷工作状态的判断条件为火焰电子流，当检测到火焰电子流 低于某个预设值，即判定燃气壁挂炉处于小负荷工作状态，当检测到火焰温度高于某个预设值，燃气壁挂炉处于大负荷工作状态。
在一些实施例中，所述检测装置9为排烟温度检测装置，所述排烟温度检测装置检测排烟口51的烟气温度，排烟温度检测装置可为设置于排烟口51的温度传感器。
判定燃气壁挂炉的负荷工作状态的判断条件为烟气温度大小，当检测到烟气温度低于某个预设值，即判定燃气壁挂炉处于小负荷工作状态，当检测到烟气温度高于某个预设值，燃气壁挂炉处于大负荷工作状态。
在一些实施例中，参照图5所示，燃气壁挂炉具有两条分流管3。通过设置两条分流管3能提高本公开的燃气壁挂炉的灵活性，使本公开的燃气壁挂炉的可调节范围更广。
在一些实施例中，所述电动阀31为电动调节阀，在小负荷工作状态下，增大电动调节阀的阀口，在大负荷工作状态下，减小电动截止阀的阀口。采用电动调节阀可根据检测装置9的检测信息灵活调节通过分流管3的水流量，可提高本公开的燃气壁挂炉调节的准确度，同时，使本公开的燃气壁挂炉的可调节范围更广。
本公开的燃气壁挂炉在换热器1两端增设了分流管3，并在分流管3上设有电动阀31，让电动阀31开启分流管3流道，使一部分水从分流管3流过，以减少通过换热器1的水流量，烟气被低温水吸收的热量减少，烟气的温度升高，同时，在出水端22温度一定的情况下，采用水分流，那么最后的出水端22是冷水和热水混合，所以流经换热器1的水温需要高于出水端22温度，这样在机组设定温度相同时，烟气温度会比没分流时高，在这双重作用下，使烟气中的水蒸气的温度高于冷凝温度，因此不会发生冷凝现象。当处于大负荷工作状态，让电动阀31关闭分流管3流道，以增加通过主换热器1的水流量，提高热效率。
可以理解，本公开是通过一些实施例进行描述的，本领域技术人员知悉的，在不脱离本公开的精神和范围的情况下，可以对这些特征和实施例进行各种改变或等效替换。另外，在本公开的教导下，可以对这些特征和实施例进行修改以适应的情况及材料而不会脱离本公开的精神和范围。因此，本公开不受此处所公开的实施例的限制，所有落入本申请的权利要求范围内的实施例都属于本公开所保护的范围内。

Claims (20)

  1. 一种防冷凝燃气壁挂炉，包括换热器以及穿过换热器的换热管，其中，还包括至少一条分流管和电动阀，所述分流管设于换热器外、且分流管的两端分别与换热器两端的换热管并接，所述电动阀设置于分流管上。
  2. 根据权利要求1所述的防冷凝燃气壁挂炉，其中，还包括检测装置，该检测装置与电动阀信号连接，用于检测燃气壁挂炉的负荷工作状态并控制电动阀的启闭。
  3. 根据权利要求2所述的防冷凝燃气壁挂炉，其中，所述换热器下方设置有燃烧器与燃气阀，所述燃烧器燃烧燃气产生高温烟气，所述燃气阀调节燃烧器的燃烧功率。
  4. 根据权利要求3所述的防冷凝燃气壁挂炉，其中，所述检测装置为燃气阀开度检测装置，所述燃气阀开度检测装置检测燃气阀的开度范围。
  5. 根据权利要求3所述的防冷凝燃气壁挂炉，其中，所述检测装置为与燃烧器连接的火焰温度检测装置或火焰电子流检测装置中的一种或者多种。
  6. 根据权利要求2所述的防冷凝燃气壁挂炉，其中，所述换热管包括进水端、出水端，所述进水端连接有循环泵，所述出水端用于连接将换热管中水的热量散发到室内的暖气片以使所述换热管通过暖气片与循环泵连接形成循环水路。
  7. 根据权利要求6所述的防冷凝燃气壁挂炉，其中，所述检测装置为出水温度检测装置，所述出水温度检测装置检测出水端的出水温度。
  8. 根据权利要求2所述的防冷凝燃气壁挂炉，其中，所述换热器上方设置有集烟罩与风机，所述风机设置于集烟罩上，所述集烟罩设置有排烟口，所述风机出风口正对排烟口。
  9. 根据权利要求8所述的防冷凝燃气壁挂炉，其中，所述检测装置为排烟温度检 测装置，所述排烟温度检测装置检测排烟口的烟气温度。
  10. 根据权利要求1所述的防冷凝燃气壁挂炉，其中，所述电动阀为电动截止阀。
  11. 根据权利要求1所述的防冷凝燃气壁挂炉，其中，所述电动阀为电动调节阀。
  12. 一种燃气壁挂炉的防冷凝方法，其特征在于，所述方法包括：
    检测燃气壁挂炉的负荷工作状态，并根据判断条件进行判断；
    当燃气壁挂炉处于小负荷工作状态，让电动阀开启，使一部分水从分流管流过，以减少通过换热器的水流量，烟气被低温水吸收的热量减少，烟气的温度升高，使烟气中的水蒸气的温度高于冷凝温度；
    当燃气壁挂炉处于大负荷工作状态，让电动阀关闭分流管流道，以增加通过换热器的水流量，提高热效率。
  13. 根据权利要求12所述的燃气壁挂炉的防冷凝方法，其中，所述电动阀为电动截止阀，小负荷工作状态下，开启电动截止阀的阀口，大负荷工作状态下，关闭电动截止阀的阀口。
  14. 根据权利要求12所述的燃气壁挂炉的防冷凝方法，其中，所述电动阀为电动调节阀，小负荷工作状态下，增大电动调节阀的阀口，大负荷工作状态下，减小电动截止阀的阀口。
  15. 根据权利要求12所述的燃气壁挂炉的防冷凝方法，其中，所述判断条件为燃气阀的开度范围，若开度低于总开度的1/3，即判定燃气壁挂炉处于小负荷工作状态，反之为大负荷工作状态。
  16. 根据权利要求12所述的燃气壁挂炉的防冷凝方法，其中，所述判断条件为出水端的出水温度，当检测到出水温度低于第一预定温度时，即判定燃气壁挂炉处于小负荷工作状态，当检测到出水温度高于第二预定温度时，即判定燃气壁挂炉处于大负荷工作状态。
  17. 根据权利要求16所述的燃气壁挂炉的防冷凝方法，其中，
    所述第一预定温度在30～45℃范围内；或，
    所述第二预定温度在45～60℃范围内。
  18. 根据权利要求12所述的燃气壁挂炉的防冷凝方法，其中，所述判断条件为火焰温度，当检测到火焰温度低于某个预设值，即判定燃气壁挂炉处于小负荷工作状态，当检测到火焰温度高于某个预设值，即判定燃气壁挂炉处于大负荷工作状态。
  19. 根据权利要求12所述的燃气壁挂炉的防冷凝方法，其中，所述判断条件为火焰电子流，当检测到火焰电子流低于某个预设值，即判定燃气壁挂炉处于小负荷工作状态，当检测到火焰温度高于某个预设值，即判定燃气壁挂炉处于大负荷工作状态。
  20. 根据权利要求12所述的燃气壁挂炉的防冷凝方法，其中，所述判断条件为烟气温度大小，当检测到烟气温度低于某个预设值，即判定燃气壁挂炉处于小负荷工作状态，当检测到烟气温度高于某个预设值，即判定燃气壁挂炉处于大负荷工作状态。
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CN109489241B (zh) * 2018-11-29 2023-11-07 艾欧史密斯(中国)热水器有限公司 燃气热水装置及其控制方法
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