Gas back-jetting pre-mixing low-NOx combustion apparatus and combustion method of combustion apparatus

Abstract

The invention discloses a gas back-jetting pre-mixing low-NOx combustion apparatus and a combustion method of the combustion apparatus, which belongs to the technical field of a high-power industrial combustor. The combustion apparatus is characterized in that: a centre cylinder is axially arranged at a throat opening centre; the end part of the centre cylinder is connected with a whirlcone which is coaxially arranged; an inner diameter and an outer diameter of the centre cylinder are consistent with the inner diameter and the outer diameter of an inner ring of the whirlcone; a peripheral axial wind channel is arranged between the periphery of the outer ring of the whirlcone and the inner wall of a throat opening; back-jetting hammer gas guns are radically distributed on the throat opening. The combustion method of the combustion apparatus is characterized in that: the gas is divided into two parts, namely the gas which is jet from a straight back-jetting hole, is backwards jet in an axial direction and rushes with axial wind at the periphery oppositely, and gas which is jet from an inclined back-jetting hole and rushes tangentially with swirl wind, after the gas enters the channel from a combustible gas hammer-type gas gun. The gas back-jetting pre-mixing low-NOx combustion apparatus disclosed by the invention has the beneficial effects that: the gas and the air are jet and oppositely rushed to be fully and uniformly mixed, so that a little of NOx smaller than 29ppm is generated without generation of CO (carbonic oxide). The combustion is stable and reliable, and the highest power of a single machine can be up to over 70MW.

Description

technical field [0001] The invention relates to a gas burner technology for a high-power industrial burner, in particular to a low-emission high-power premixed burner with gas back-spraying, a flame evenly distributed throughout the entire space of the furnace, and a uniform temperature field. Background technique [0002] With the improvement of domestic environmental protection requirements, the introduction and application of low-carbon, low-emission, energy-saving and emission-reduction policies have put forward higher requirements for high-power gas burners in terms of safety and environmental protection. The power of traditional domestic gas burners generally does not exceed 21MW, and there are problems such as unstable combustion and large emissions. Most domestic and foreign gas burners use diffusion (non-premixed) combustion technology, especially gas burners above 7MW, that is, gas and combustion-supporting air flow into the combustion chamber through different cha...

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Problems solved by technology

The combustion temperature of this type of burner is balanced, the excess air coefficient is extremely small, and the combustion is carried out evenly in the entire space of the combustion chamber, and the amount of NOx produced is much lower than that of the diffusion type burner. It is easy to produce serious problems such as tempering or even explosion, which seriously hinders the development and application of this technology, so foreign advanced burner manufacturers only produce such low-power (below 6MW) gas burners

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