Low emission gas combustion furnace and its combustion air configuration method

Abstract

A low-emission gas combustion furnace and a combustion-supporting air configuration method thereof relate to the technical field of combustion equipment and solve the technical problem of reducing NOx emissions. In the throat of the gas combustion furnace, the first swirler, the middle cylinder, and the second swirler are coaxially sleeved in sequence from the outside to the inside; a plurality of stable blocks are arranged symmetrically between the outer ring of the first swirler and the inner wall of the throat. Flame plate; there are multiple L-shaped gas guns and oblique gas guns arranged and fixed around the axis of the throat with equal diameters between the flame-stabilizing plates. Fuel holes and multiple lateral gas holes; there are multiple oblique gas holes on the oblique gas gun, and the gas injection directions are all inclined outwards in a divergent state without interfering with each other. Combustion-supporting air enters the throat from the central combustion-supporting air passage in the middle cylinder and the second combustion-supporting air passage outside the middle cylinder, and the combustion-supporting air entering the throat from the second combustion-supporting air passage accounts for 80% to 95% of the total combustion-supporting air. The gas combustion furnace provided by the invention has low NOx emission.

Description

Technical field [0001] The invention relates to a gas combustion equipment, in particular to an ultra-low emission gas combustion furnace with NOx emission less than 15 ppm, belonging to the technical field of industrial boilers. Background technique [0002] Environmental problems, especially air pollution caused by NOx emissions from industrial boilers, have severely affected people's lives and health. NOx emissions have led to the formation of acid rain and the generation of smog in the air, which has attracted more and more attention from the government and people. In the field of industrial boilers and power station boilers, the country has issued nearly stringent standards and regulations, and the NOx emission is no longer satisfied with the national standard of 100ppm. Since 2015, Beijing and other cities have required NOx emissions to be less than 40ppm. New boilers are required NOx emissions are less than 15ppm. At the same time, Tianjin, Urumqi and some gas heating com...

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Problems solved by technology

However, this method is an auxiliary method for the burner, and the efficiency of reducing NOx is limited. It needs to increase the blower power and power consumption. At the same time, this method also increases the possibility of combustion instability, which is easy to cause surge; in the patent No. The Chinese patent document ZL201010283095.4 "Flue Gas Recirculation Technology and Burner Combustion Air and Circulating Flue Gas Premixing Device" has been elaborated

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