Smoke classifying and inner circulating type low-NOx and high-calorific-value fuel gas combustion device

Abstract

The invention relates to a smoke classifying and inner circulating type low-NOx and high-calorific-value fuel gas combustion device. The device is characterized in that a device body comprises a combustor throat port, a central barrel, a flame stabilizer or a cyclone, a combustion supporting air channel which consists of a direct-flow air channel and a spiral-flow air channel, and a plurality of inner fuel gas guns and outer fuel gas guns, wherein gun heads of the plurality of inner fuel gas guns and the outer fuel gas guns are arranged at the outer side of the combustor throat port in an extending manner; a plurality of front fuel gas injecting holes, side injecting holes and inclined injecting holes are formed in the plurality of inner fuel gas guns and the outer fuel gas guns. When in work, fuel gas is injected out in different directions by class through the front fuel gas injecting holes, the side injecting holes and the inclined injecting holes and is fully uniformly mixed with combustion supporting air to realize combustion, and thus the distribution uniformity and the fullness of flame can be improved; relatively-high-pressure high-temperature smoke produced by combusting close to the gun heads can flow back to a combustion supporting air area under the sucking effect of low-air-pressure combustion supporting air at the upstream and is mixed to obtain low-oxygen-contentcombustion supporting air, and the combustion supporting air is used in following uniformly-distributed flame combustion, and thus the inner smoke circulation with the same effect as an outer smoke circulating technology can be achieved on the premise that any smoke circulating facilities are not increased. The device is simple and reasonable in structure, is low in cost, and is innovation in thefield of low-NOx combustion devices.

Description

technical field [0001] The invention relates to the technical field of emission reduction devices for industrial boilers, in particular to a flue gas classification internal circulation type low NOx high calorific value gas combustion device. Background technique [0002] With the continuous increase of national environmental protection control in recent years, the environmental protection standards for NOx emissions of gas-fired boilers have become increasingly strict. For this reason, the industry is actively exploring low-nitrogen combustion technologies and transforming gas-fired boilers. At present, in terms of low nitrogen emission of high calorific value natural gas boilers, it has been proposed that the NOx emission value be reduced to 30mg / Nm 3 target requirements. In practice, it has been found that when upgrading a gas-fired boiler, in addition to the need to replace the low-nitrogen burner, it is also necessary to supplement the flue gas external circulation com...

AI Technical Summary

Problems solved by technology

However, with the passage of application time, some shortcomings have been gradually discovered in practice: First, because the low-temperature flue gas participating in the external circulation needs to be introduced from the tail of the boiler to the front of the burner throat, a special flue gas needs to be installed. Gas recirculation pipe, smoke mixing box, recirculation fan and other necessary smoke circulation components, so the structure is relatively complicated, and the installation cost is high; second, due to the large temperature difference, it is easy to generate condensed water and affect the thermal efficiency

Therefore, from the perspective of economy and practicality, it is not yet ideal.

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