Rotating type flameless burner capable of achieving ultralow NOx emissions

Abstract

The invention belongs to the field of flameless burning, and particularly discloses a rotating type flameless burner capable of achieving ultralow NOx emissions. A center gas spraying pipe of the burner is used for conveying and spraying gas, an air inlet straight pipe is used for conveying air into an air channel, air conditioning spraying openings are symmetrically formed in the wall face of the air channel, the counter-acting force is generated through sprayed-out air, the rotating type flameless burner is driven to rotate around the center axis, through moving of a first flow cutting ring, an air direct spraying pipe is controlled to be opened and closed, and therefore at the flameless combustion burning stage, air is sprayed; through moving of a second flow cutting ring, an air rotational flow spraying pipe is controlled to be opened and closed, and at the preheating burning stage, the air is sprayed. Counter-acting force generated by the air conditioning spraying openings is used for driving air and gas to rotate around the centre axis, gas and entrapped high temperature smoke are mixed in a whole hearth, the reaction area is expanded, the more uniform in-burner furnace temperature distribution is obtained, and the ultralow NOx emissions are achieved.

Description

technical field [0001] The invention belongs to the field of flameless combustion, and more specifically relates to a method for realizing ultra-low NO x Discharged rotary flameless burner. Background technique [0002] In recent years, with the advancement of a series of measures such as "coal to gas" in industrial and heating boilers, natural gas has been widely used in production and life, but the combustion of natural gas has become one of the main sources of pollutants such as nitrogen oxides in the atmosphere . In order to reduce environmental pollution, more stringent NO x Emission standards, taking Beijing as an example, the newly released "Emission Standards of Air Pollutants for Boilers" (DB11 / 139-2015) requires NO x Emission concentration should be lower than 30mg / m 3 , in order to meet this requirement, it is necessary to apply low-nitrogen combustion technology in natural gas combustion. Flameless combustion technology because of its high thermal efficiency...

AI Technical Summary

Problems solved by technology

CN201410020218.3 proposes a diagonal flow normal temperature flameless burner, and CN201410019516.0 proposes a direct injection gas flameless burner. Both of the above two patents use gas flow and air flow direct injection to achieve flameless Combustion, but does not consider the diversification of the direct jet flow, and the direct injection nozzle is fixed, the jet flow with conventional speed and momentum may not be able to achieve better temperature uniformity in the furnace, so higher jet velocity and momentum are required to achieve Good effect of flameless combustion, too high requirements on the pressure head of the air fan

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