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Method for reducing nitrogen oxide emission of wall-hanging stove and fuel gas wall-hanging stove

A gas-fired wall-hung boiler and nitrogen oxide technology, which is applied in the field of natural gas combustion, can solve the problems of limited application scope, high cost, and difficulty in reaching the fourth-level emission of the wall-hung boiler, and achieves the effects of low cost, small structural changes, and reduced emission concentration.

Pending Publication Date: 2019-08-20
MACRO THERMAL ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the mainstream conventional atmospheric wall-hung boilers in the existing market are concentrated in the third-level emission, and it is difficult to meet the requirements of the fourth-level emission, which limits the scope of application of the wall-hung boiler equipped with atmospheric burners
[0003] Existing gas appliances adopt thick and thin burners, water-cooled burners, and full premixed combustion methods to meet the requirements of low nitrogen oxide emissions, and the cost is high

Method used

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  • Method for reducing nitrogen oxide emission of wall-hanging stove and fuel gas wall-hanging stove
  • Method for reducing nitrogen oxide emission of wall-hanging stove and fuel gas wall-hanging stove
  • Method for reducing nitrogen oxide emission of wall-hanging stove and fuel gas wall-hanging stove

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Embodiment 1

[0032] According to the applicant's literature review and research practice, it is found that the nitrogen oxides generated by the combination of the existing wall-hung boiler structure and the atmospheric burner mainly include the following types:

[0033] 1. A small amount of fuel-type NOx. Fuel-type NOx is produced by the oxidation of nitrogen atoms present in the fuel in the form of compounds. After the purification process, the content of nitrogen compounds in the gaseous fuel for civil use is very small, and the fuel type NOx has the characteristics of medium temperature generation, and its generation temperature is 600-900 ° C, while the combustion temperature of the existing atmospheric burner is generally higher than this Therefore, atmospheric combustion produces almost no fuel-type NOx.

[0034] 2. About 10% fast NOx, fast NOx is a unique phenomenon when hydrocarbon-rich fuels are burned under the condition of too rich fuel (α<1.0), and it is generated on the inner ...

Embodiment 2

[0042] like figure 1As shown, a gas wall-hung boiler includes a wall-hung furnace body 1, a burner 2, a heat exchanger 3, a smoke collection hood 4 installed in the wall-hung furnace body 1 from bottom to top, and a The blower fan 5 on the smoke hood 4; it is characterized in that a smoke collection hood baffle plate 6 is provided in the smoke collection hood 4, and the surroundings of the smoke collection hood baffle plate 6 are in contact with the inner wall of the smoke collection hood 4, Several air holes 7 are arranged on the baffle plate 6 of the smoke collecting hood.

[0043] Among them, such as figure 2 As shown, the ventilation holes 7 include two square holes and several circular holes, the two square holes are located on the front side of the smoke hood baffle plate 6, and have different sizes; the circular holes are randomly distributed in the collection On the fume hood baffle plate 6, there are at least two kinds of holes with different apertures. The openin...

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Abstract

The invention discloses a method for reducing nitrogen oxide emission of a wall-hanging stove. The method is characterized in that flow guiding plates are arranged at the left side and the right sideof a burner; a smoke collecting hood baffle is arranged between a heater exchanger and a smoke collecting hood; the airflow structure is changed through the flow guiding plates and the smoke collecting hood baffle, so that flue gas in a combustion chamber is uniform in flow velocity; and thus, the temperatures and excess air coefficients of all local points of the burner basically maintain the same, and the purpose of inhibiting generation of heating power type NOx is achieved. By means of the method, the emission concentration of the heating power type NOx of a mainstream conventional atmosphere type burner product which is configured at present can be lowered, and thus, the purpose of lowering the emission concentration of nitrogen oxide of the wall-hanging stove is achieved; and the whole structure is changed slightly, and the cost is low. The invention further provides the fuel gas wall-hanging stove.

Description

technical field [0001] The invention relates to the technical field of natural gas combustion, in particular to a method for reducing the emission of nitrogen oxides from a wall-hung boiler and a gas-fired wall-hung boiler. Background technique [0002] With the strengthening of national energy conservation and environmental protection requirements, more and more regions have become more and more strict about the flue gas emission of wall-hung boilers. According to the test method of GB25034-2010 "Gas Heating Water Heater", the emission concentration of nitrogen oxides is required to meet energy saving and environmental protection (the requirement for nitrogen oxides is less than 120mg / kw*h), or even level 4 emission (the requirement for nitrogen oxides is lower than 100mg / kw*h). Most of the mainstream conventional atmospheric wall-hung boilers in the existing market are concentrated in the third-level emission, and it is difficult to meet the requirements of the fourth-lev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24D15/00F24D19/00
CPCF24D15/00F24D19/00
Inventor 黄志飞汪为彪
Owner MACRO THERMAL ENERGY TECH
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