Low-emission gas combustion furnace and combustion air preparation method thereof

Abstract

The invention provides a low-emission gas combustion furnace and a combustion air preparation method thereof and relates to the technical field of combustion equipment. The technical purpose of NOx emission reduction is achieved. A first cyclone, a middle barrel and a second cyclone are sequentially and coaxially arranged in a throat of the gas combustion furnace in a sleeving manner from outside to inside. Multiple flame stabilizing boards are symmetrically arranged between the outer ring of the first cyclone and the inner wall of the throat. Multiple L-shaped gas guns and inclined-port gas guns which are arranged between the flame stabilizing boards are fixedly distributed around the axis of the throat at equal diameter. Forward spray holes, radial spray holes, return spray holes and multiple side spray holes are formed in the L-shaped gas guns. Multiple inclined spray holes are formed in the inclined-port gas guns. All the gas spray directions incline outwards in a scattered manner without mutual interference. Combustion air enters the throat through a center combustion air channel in the middle barrel and a second combustion air channel outside the middle barrel, and the combustion air entering the throat from the second combustion air channel accounts for 80% to 95% of the total amount of the combustion air. By the adoption of the gas combustion furnace, the NOx emission is low.

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 15ppm, which belongs to the technical field of industrial boilers. Background technique [0002] Environmental problems, especially air pollution caused by NOx emissions from industrial boilers, have seriously affected people's lives and health. NOx emissions lead to the formation of acid rain and the generation of smog in the air, which have been paid more and more attention by the government and the people. In the field of industrial boilers and power plant boilers, the country has issued almost stringent standards and regulations, and the NOx emissions have not met the national standard of 100ppm. Since 2015, cities such as Beijing have required NOx emissions to be less than 40ppm. New boilers require NOx emission is less than 15ppm. At the same time, Tianjin, Urumqi and some gas heating companies have propo...

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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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