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Pipe cooling type fuel gas premixing ultra-low nitrogen combustor and premixing method

A low-nitrogen burner and gas premixing technology, applied in combustion methods, gas fuel burners, burners, etc., can solve the problems of complex structure, large volume, and difficulty in miniaturization, and achieve less NOX generation and mixing uniformity. Good results

Inactive Publication Date: 2021-06-22
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the former is larger in size and relatively more complex in structure.
The latter adds a solid blunt body to the nozzle, and the structure is relatively complicated, and it is relatively difficult to miniaturize

Method used

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  • Pipe cooling type fuel gas premixing ultra-low nitrogen combustor and premixing method
  • Pipe cooling type fuel gas premixing ultra-low nitrogen combustor and premixing method
  • Pipe cooling type fuel gas premixing ultra-low nitrogen combustor and premixing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Such as figure 1 As shown, this embodiment is a tube-cooled gas premixed ultra-low nitrogen burner according to the present invention, which includes a burner body. The burner body is provided with a gas inlet 1 and an auxiliary gas inlet 2. The burner body There is an inner cavity inside, and the inner cavity is divided into a premixing chamber 4, a tube-cooled mixing chamber 5 and a combustion chamber 6 in sequence along the airflow direction; the gas inlet 1 and the auxiliary gas inlet 2 are respectively connected with the premixing chamber 4, and the auxiliary gas inlet 2 There is a flow equalizing plate 3 inside, the flow equalizing plate 3 closes the gas-supporting gas inlet 2, and a number of flow-balancing holes are arranged on the flow-balancing plate 3, and the flow-balancing holes pass through the gas-supporting gas inlet 2 and the premixing chamber 4; the premixing chamber 4 is provided with A safety valve interface 12, the safety valve interface 12 is conne...

Embodiment 2

[0048] Such as figure 1 As shown, this embodiment is a tube-cooled gas premixed ultra-low nitrogen burner according to the present invention, which includes a burner body. The burner body is provided with a gas inlet 1 and an auxiliary gas inlet 2. The burner body There is an inner cavity inside, and the inner cavity is divided into a premixing chamber 4, a tube-cooled mixing chamber 5 and a combustion chamber 6 in sequence along the airflow direction; the gas inlet 1 and the auxiliary gas inlet 2 are respectively connected with the premixing chamber 4, and the auxiliary gas inlet 2 There is a flow equalizing plate 3 inside, the flow equalizing plate 3 closes the gas-supporting gas inlet 2, and a number of flow-balancing holes are arranged on the flow-balancing plate 3, and the flow-balancing holes pass through the gas-supporting gas inlet 2 and the premixing chamber 4; the premixing chamber 4 is provided with A safety valve interface 12, the safety valve interface 12 is conne...

Embodiment 3

[0054] Such as figure 1 As shown, this embodiment is a tube-cooled gas premixed ultra-low nitrogen burner according to the present invention, which includes a burner body. The burner body is provided with a gas inlet 1 and an auxiliary gas inlet 2. The burner body There is an inner cavity inside, and the inner cavity is divided into a premixing chamber 4, a tube-cooled mixing chamber 5 and a combustion chamber 6 in sequence along the airflow direction; the gas inlet 1 and the auxiliary gas inlet 2 are respectively connected with the premixing chamber 4, and the auxiliary gas inlet 2 A flow equalizer 3 is provided inside, and the flow equalizer 3 closes the gas-supporting gas inlet 2, and a number of flow-uniform holes are arranged on the flow uniformity plate 3, and the flow uniformity holes penetrate through the gas-supporting inlet 2 and the premixing chamber 4; the premixing chamber 4 is provided with There is a safety valve interface 12, and the safety valve interface 12 i...

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Abstract

A pipe cooling type fuel gas premixing ultra-low nitrogen combustor comprises a combustor body, wherein a fuel gas inlet and a combustor-supporting gas inlet are formed in the combustor body, an inner cavity is formed in the combustor body, and the inner cavity is sequentially divided into a premixing cavity, a pipe cooling mixing chamber and a combustion chamber in the airflow direction; the fuel gas inlet and the combustion-supporting gas inlet respectively communicate with the premixing cavity, and a flow equalizing plate is arranged in the combustion-supporting gas inlet; a cooling pipe bundle is arranged in the pipe cooling mixing chamber and comprises a plurality of cooling pipes, a gap is formed between every two adjacent cooling pipes and forms a premixed gas channel, and the premixed gas channels communicate with the premixing cavity and the combustion chamber. The invention further provides a premixing method of the pipe cooling type fuel gas premixing ultra-low nitrogen combustor. Two low-nitrogen premixing combustor key elements including gas backdraft control and complete mixing of gas and combustion-supporting gas are integrated, gas and combustion-supporting gas are mixed in two stages, media in pipes are cooled, the mixing characteristic is good, the environment temperature is low, the airflow velocity is high, safety is achieved, backfire is avoided, combustion is sufficient, and ultra-low nitrogen emission is achieved.

Description

technical field [0001] The invention relates to a gas ultra-low nitrogen emission burner, in particular to a tube-cooled gas premixed ultra-low nitrogen burner and a premixing method. Background technique [0002] The nitrogen oxides produced by combustion will be dissolved in water to form acid rain, which will bring extensive harm to the environment and cause huge economic losses. In 2015, the Beijing Municipal Environmental Protection Bureau promulgated the "Boiler Air Pollutant Emission Standard", which stipulates that: from April 1, 2017, the nitrogen oxide emission of newly built boilers shall not exceed 30mg / m 3 , the nitrogen oxide emission of boilers in use shall not be higher than 80mg / m 3 . At present, low-nitrogen burners mainly include fuel-staged burners, air-staged burners, flue gas recirculation burners, high-temperature air burners, porous media burners and composite burners. For gas-fired boilers, there are three main technologies to achieve low-nitrogen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23D14/02F23D14/46F23D14/62F23D14/70
CPCF23D14/02F23D14/46F23D14/62F23D14/70F23D2203/007
Inventor 程乐鸣邱坤赞周劲松张维国王勤辉方梦祥余春江郑成航肖刚高翔骆仲泱倪明江
Owner ZHEJIANG UNIV
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