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Gas boiler waste heat recovery and purification system based on membrane humidification

A gas-fired boiler and waste heat recovery technology, applied in lighting and heating equipment, combustion methods, combustion equipment, etc., can solve the problems of heat waste and high nitrogen oxide emissions from gas-fired boilers, so as to facilitate waste heat recovery, and realize waste heat recovery and elimination. The effect of whitening and improving the service life

Active Publication Date: 2019-01-25
BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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Problems solved by technology

[0003] (1) The temperature of the flue gas discharged by the gas-fired hot water boiler is much higher than its dew point temperature, so that a large amount of latent heat of water vapor condensation is discharged with the high-temperature flue gas, resulting in a waste of heat
[0004] (2) The emission of nitrogen oxides from gas-fired boilers is high

Method used

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  • Gas boiler waste heat recovery and purification system based on membrane humidification

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Embodiment Construction

[0023] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0024] It should be noted that, in the description of the present invention, the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner" and "outer" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and Simplified descriptions, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and thus should not be construed as limiting the invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and should not be understood as indicating or implying relative importan...

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Abstract

The invention discloses a gas boiler waste heat recovery and purification system based on membrane humidification, which belongs to the technical field of flue gas waste heat recovery and purification. The system comprises a membrane type spray heat and mass transfer tower 7 and a flue gas recirculation device 2. The flue gas recirculation device 2 is respectively connected with a boiler 1 and themembrane type spray heat and mass transfer tower 7, after flue gas A passes through a fan 8, recirculation flue gas B is supplied to a draught fan, the recirculation flue gas B, and fuel gas I and high-temperature high-humidity combustion air H are introduced into the boiler 1 after mixed to supply gas J for the boiler so as to reduce NOx; the membrane type spray heat and mass transfer tower 7 isvertically divided into a liquid storage tank 11, a flue gas-medium circulating water heat transfer segment 3 and a flue gas-air heat and mass transfer segment 5 from bottom to top so as to be used for recycling the total heat of the flue gas. The system realizes the recycle of the total heat of flue gas waste heat, improves the heat efficiency of the boiler, and reduces the NOx emission of the boiler through the humidification of combustion air and the recirculation of the flue gas.

Description

technical field [0001] The invention belongs to the technical field of flue gas waste heat recovery and purification, and in particular relates to a gas boiler waste heat recovery and purification system based on membrane humidification. Background technique [0002] Natural gas is one of the main energy sources for heating in Beijing, but there are currently two problems that need to be solved urgently in gas-fired boilers: on the one hand, the waste heat of flue gas condensation emitted by gas-fired boilers has not been fully utilized; on the other hand, the nitrogen oxides emitted by gas-fired boilers It has not been well purified. If the gas-fired boiler waste heat utilization efficiency and flue gas purification effect are improved, it will have important engineering application value for realizing energy saving of central heating and clean air environment quality. At present, there are still the following technical problems in using natural gas as the main energy sour...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C9/06F23J15/04F23J15/06F23L15/04
CPCF23C9/06F23J15/04F23J15/06F23L15/04Y02E20/34
Inventor 张群力沈祺孙东晗
Owner BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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