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Waste heat recovering system of boiler

A technology for recovering waste heat from systems and boilers, applied to preheating, feed water heaters, lighting and heating equipment, etc., can solve the problems of inconvenient maintenance and low waste heat recovery rate, and achieve high recovery rate

Inactive Publication Date: 2011-09-14
GUANGXI ZHIYUAN ENERGY SAVING & ENVIRONMENTAL PROTECTION EQUIP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The problem to be solved by the present invention is to provide a boiler waste heat recovery system, which can solve the problems of low waste heat recovery rate and inconvenient maintenance of the existing boiler waste heat recovery system, and the need to stop the operation of the boiler when the boiler flue gas waste heat recovery device fails. problems with repairs

Method used

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Embodiment Construction

[0018] Below in conjunction with accompanying drawing and embodiment the present invention is further described:

[0019] figure 1 The boiler waste heat recovery system shown has a gas-fired boiler 1, and the main flue from the smoke outlet of the gas-fired boiler 1 to the smoke outlet of the chimney 2 is connected with a bypass flue at the lower part of the chimney 2. This bypass flue The duct is composed of a flue valve 4, a boiler flue gas waste heat recovery device 6, an induced draft fan 7, and a flue valve 8 in series through the air pipe 5, and is installed between the two interfaces of the bypass flue and the main flue at the lower part of the chimney 2 There is switching valve 3. Close the flue valves 4 and 8, and open the switch valve 3, which can control the flue gas of the gas boiler 1 to be discharged directly from the chimney 2 to the air. 6 for maintenance; open the flue valves 4 and 8, and close the switch valve 3, so that the flue gas from the gas boiler 1 c...

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Abstract

The invention discloses a waste heat recovering system of a boiler, which comprises the boiler (1), a chimney (2), a main flue and a smoke waste heat recovering device (6) of the boiler, wherein the main flue is from a smoke outlet of the boiler (1) to a smoke outlet of the chimney (2), a cooling water tank is arranged in the smoke waste heat recovering device (6) of the boiler, a bypass flue is connected to the main flue, a draught fan (7) and the smoke waste heat recovering device (6) of the boiler are connected in series to the bypass flue, and a switching valve (3) used for selecting one of the main flue and the bypass flue for the smoke of the boiler is arranged on the main flue. Compared with the traditional waste heat recovering system of the boiler, the waste heat recovering system disclosed by the invention can be used for solving the problems of low waste heat recovery rate, inconvenience for maintenance, and need of stopping the boiler for maintenance when the smoke waste heat recovering device of the boiler is in failure.

Description

technical field [0001] The invention relates to the technical field of heat exchange equipment manufacture and application, in particular to a gas boiler flue gas waste heat recovery system. Background technique [0002] The fuel of gas-fired boilers is usually natural gas, and its main component is methane. After combustion, a large amount of water vapor is generated. The water content of the flue gas is about 20%. The heat loss of the exhaust gas not only has a large amount of sensible heat loss, but also the latent heat of vaporization of water vapor. loss. The tail of small and medium-sized gas-fired boilers is usually not equipped with heat exchange equipment, and the exhaust gas temperature is generally 170-210°C. The waste heat recovery potential is great, but it is still difficult to popularize and apply the waste heat recovery of gas-fired boilers. There are two main reasons for this; one is that the recovery efficiency of the waste heat recovery device is not high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22D1/02F23J15/06
CPCY02E20/30
Inventor 钟德鸿黄家祺古善全赵海勇
Owner GUANGXI ZHIYUAN ENERGY SAVING & ENVIRONMENTAL PROTECTION EQUIP
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