Concentrated low-nitrogen dual channel swirl burner with central air

Abstract

The invention discloses a concentrated low-nitrogen dual channel swirl burner with central air. The burner comprises a dual channel swirl nozzle area with one communicating with a combustion furnace and comprising a central air channel, a primary air channel, an inner secondary air channel and an outer secondary air channel which are sequentially sleeved from inside to outside, an exhaust air channel with one end further communicating with the combustion furnace, and further provided with an air volume adjusting valve, and a pulverized coal concentration part, wherein a common inlet of pulverized coal primary air is formed in one end of the pulverized coal concentration part, and the other end of the pulverized coal concentration part communicates with the other ends of the primary air channel and the exhaust air channel separately. The burner disclosed by the invention is high in adaptability across coal types, high in combustion efficiency, good in stable combustion effect, good in low-nitrogen effect and good in anti-coking performance, and the win-win of environment and economic benefits is achieved.

Description

technical field [0001] The invention belongs to the technical field of burners, and relates to a concentrated double-air swirl low-nitrogen burner provided with central air. Background technique [0002] With the changes in the national power and coal market, in order to improve the economic benefits of enterprises, all power plants are committed to finding relatively cheap coal sources, so there is a phenomenon that the actual coal quality deviates from the design coal quality. Some of the bituminous coal-fired power plants began to burn lignite in a large proportion in order to reduce fuel costs. As a result, the primary air rate of the burner was much higher than the design value, the ratio of secondary air to primary air was out of balance, and the combustion organization was not good. , resulting in the increase of carbon content in boiler fly ash and large slag, the increase of NOx emission value at the outlet of economizer, the increase of CO emission value, the burni...

AI Technical Summary

Problems solved by technology

Some of the bituminous coal-fired power plants began to burn lignite in a large proportion in order to reduce fuel costs. As a result, the primary air rate of the burner was much higher than the design value, the ratio of secondary air to primary air was out of balance, and the combustion organization was not good. , resulting in the increase of carbon content in boiler fly ash and large slag, the increase of NOx emission value at the outlet of economizer, the increase of CO emission value, burner loss, coking and other problems

In order to solve the problem of the adaptability of the burner across coal types, the present invention proposes a low-nitrogen burner capable of simultaneously burning bituminous coal and lignite in power plants

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