Non-premixed air classification low-NOx combustor

An air classification and burner technology, applied in the direction of gas fuel burner, burner, combustion type, etc., can solve the problem that the emission value of ordinary gas-fired boilers cannot meet the emission requirements, so as to reduce the residence time, improve the mixing degree, and reduce the The effect of NOx combustion

Pending Publication Date: 2022-05-06
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In recent years, with the promulgation of my country's air pollutant emission standards, as well as the strengthening of environmental protection and the deepening of energy-saving and emission-reduction policies, the requirements for NOx emission indicators are also increasing. The emission values ​​​​of ordinary gas-fired boilers used in the past have not reached to national emission requirements

Method used

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  • Non-premixed air classification low-NOx combustor
  • Non-premixed air classification low-NOx combustor
  • Non-premixed air classification low-NOx combustor

Examples

Experimental program
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Effect test

Embodiment

[0039] A non-premixed air staged low NOx burner 1 such as Figure 1-8 As shown, it includes a non-premixed passage 2 arranged inside the burner 1 and a secondary air passage 6 arranged on the side wall of the burner 1; the non-premixed passage 2 includes a gas passage 4 and an air passage 3; the air passage 3 and the The non-premixed channel 2 is coaxially arranged, the gas channel 4 is the annular gap between the air channel 3 and the non-premixed channel 2; there are several secondary air channels 6, which are arranged at the outlet of the non-premixed channel 2 along the circumferential direction On the side wall of the burner 1 at the front end.

[0040] More specifically, in this example:

[0041] The amount of air entering the burner 1 through the air passage 3 is 80% of the theoretical air amount of the complete combustion of the gas, so that the flame temperature generated by the combustion of the gas is lower, thereby reducing the emission of thermal NOx; at the same...

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Abstract

The invention relates to a low-NOx combustor, in particular to a non-premixed air classification low-NOx combustor which comprises a non-premixed channel arranged in the combustor and a secondary air channel arranged on the side wall of the combustor. The non-premixing channel comprises a fuel gas channel and an air channel; the air channel and the non-premixing channel are coaxially arranged, and the gas channel is an annular gap between the air channel and the non-premixing channel; and a plurality of secondary air channels are arranged on the side wall of the combustor at the front end of the outlet of the non-premixing channel along the circumferential direction. Compared with the prior art, air classification is combined, a high gas flow speed structure is designed, the combustion flame temperature is effectively reduced, the gas residence time is effectively shortened, then generation of NOx is restrained, and low-NOx combustion is achieved.

Description

technical field [0001] The invention relates to a low NOx burner, in particular to a non-premixed air staged low NOx burner. Background technique [0002] Among atmospheric pollutants, NOx is the main cause of acid rain. Naturally emitted NOx mainly comes from the decomposition of organic matter in the soil and ocean, which belongs to the natural nitrogen cycle process; most of the NOx emitted by human activities comes from the combustion process of fossil fuels, such as the combustion process of automobiles, aircraft, internal combustion engines and industrial kilns ; Also from the production and use of nitric acid, such as nitrogen fertilizer plants, organic intermediate plants, non-ferrous and ferrous metal smelters, etc. Under high-temperature combustion conditions, NOx mainly exists in the form of NO, and NO accounts for about 95% of the initially emitted NOx. However, NO can easily react with oxygen in the air in the atmosphere to form NO 2 , so NOx in the atmospher...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23D14/20F23D14/70F23D14/60F23D14/82F23L9/00
CPCF23D14/20F23D14/70F23D14/60F23D14/82F23L9/00
Inventor 王清成张子函
Owner SHANGHAI INST OF TECH
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