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Natural gas condensing boiler system and method thereof for catalytic oxidation of fuel-rich combustion

A combustion catalytic and condensing boiler technology, which is applied in the field of fuel-rich combustion catalytic oxidation natural gas condensing boiler system, can solve the problem of high transformation cost and achieve the effect of avoiding ammonia escape

Inactive Publication Date: 2018-12-18
XI AN JIAOTONG UNIV
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Problems solved by technology

However, the transformation of the gas-fired boiler is mainly to transform the burner, and the transformation cost is relatively high.

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  • Natural gas condensing boiler system and method thereof for catalytic oxidation of fuel-rich combustion

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Embodiment Construction

[0035] In describing the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "inner", "outer", "side", "end", "side" etc. The indicated orientation or positional relationship 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 that the referred device or element must have a specific orientation, or in a specific orientation. construction and operation, therefore, should not be construed as limiting the invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the pr...

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Abstract

The invention discloses a natural gas condensing boiler system and a method thereof for catalytic oxidation of fuel-rich combustion. A combustor is successively connected with a fuel-rich combustion chamber, a second return flue pipe and a third return flue pipe to form three flue gas return paths. An excess air coefficient maintained in the fuel-rich combustion chamber is less than 1. 0, an unburnt gas catalytic oxidation device is arranged on the third return flue pipe, and flue gas passes through the three flue gas return paths and is connected with a chimney by passing through an energy saver and a condenser successively. According to the natural gas condensing boiler system, rapid combustion in a reducing atmosphere is achieved, and almost no NO<x> is generated by low-temperature oxidation in the unburnt gas catalytic oxidation device, thus the NO<x> emission level can be strictly controlled, and environmental pollution is reduced; according to the natural gas condensing boiler system and the method thereof for catalytic oxidation of fuel-rich combustion, NO<x> emission can be effectively decreased, meanwhile, the alteration cost is saved, and the heat is recycled; and the system has a wide application range, and is suitable for various heating condensing boilers.

Description

technical field [0001] The invention belongs to the technical field of natural gas boilers, and in particular relates to a fuel-rich combustion catalytic oxidation natural gas condensing boiler system and a method thereof. Background technique [0002] Nitrogen oxides mainly come from the burning of fossil fuels, which not only irritate the human respiratory organs, but also form pollution such as ozone, acid rain, and photochemical smog through chemical reactions. In recent years, the country has vigorously promoted the low-nitrogen transformation of gas-fired boilers, the main purpose of which is to reduce the emission of nitrogen oxides from the source. The latest national nitrogen oxide emission standard in 2018 is the national boiler air pollutant emission standard issued in 2014 and required to be implemented in July 2016. The emission standards of nitrogen oxides for gas-fired boilers are: 400mg for boilers in use, 200mg for newly built gas-fired boilers, and 150mg f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24H8/00F24H9/18
CPCF24H8/00F24H9/1836Y02B30/00
Inventor 刘银河张旭杨浩
Owner XI AN JIAOTONG UNIV
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