A high-speed burner with large speed difference and low NOx

Abstract

The invention relates to a high-speed burner with a large speed difference and low nitrogen oxides, which is provided with a burner brick, air and gas inlet pipes, a burner shell, a gas nozzle, a pre-combustion chamber and an air distribution plate; the inner chamber of the burner brick It is a combustion chamber; a primary air inlet channel is arranged around the circular tube wall of the gas nozzle, and a pre-combustion chamber is arranged at the outlet of the gas nozzle, and a secondary air inlet channel is arranged on the circumference of the end of the pre-combustion chamber near the gas nozzle. There is an air distribution plate on the side of the outlet end of the chamber, and three air inlet passages are arranged on the circumference of the air distribution plate. The burner adopts three-time air intake structure and three-time air distribution method, and adopts the large speed difference between the incomplete combustion flue gas mixture discharged from the pre-combustion chamber and the combustion-supporting air flow of the three-time air intake channel, so that a The airflow recirculation zone, the airflow recirculation zone ensures the stable and complete combustion of the gas, reduces the highest temperature point of the flame during the gas combustion process, and makes the operation of the kiln meet the national and enterprise standards for low NOx emissions.

Description

technical field [0001] The invention relates to a partially premixed gas-fired kiln burner, in particular to a high-speed burner with large speed difference and low nitrogen oxides, belonging to the technical field of combustion equipment. Background technique [0002] Furnace is the most common important thermal equipment in industrial production. Various burners are its basic units. For furnaces such as coke ovens, blast furnaces, and converters that use gas as fuel, the nitrogen oxides generated by combustion are mainly Fuel and thermal NOx. For furnaces that use natural gas as fuel, due to the low content of nitrogen and compounds in natural gas, the NOx products generated by combustion are mainly thermal NOx; the amount of NOx products generated by furnace combustion is closely related to temperature, and furnaces The higher the internal temperature, the more NOx products are produced. At present, the NOx emission of natural gas burners used in China is generally high...

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Problems solved by technology

[0004] The purpose of the present invention is in order to solve the burner NO of the metallurgical kiln existing for a long time in the prior art X To solve the problem of high emissions, provide a high-speed burner with a large speed difference and low nitrogen oxides that is simple in structure, can ensure stable and complete combustion of fuel, achieve energy saving and consumption reduction in kiln operation, and meet national and enterprise standards for low NOx emissions.

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