A pulverized coal swirl burner

Abstract

The invention discloses a coal powder turbulent burner comprising a pre-burning chamber and a burner body. The burner body comprises a central air pipe, a primary air pipe and a secondary air pipe. The front end of the burner body extends into the pre-burning chamber. By arranging a truncated-cone-type blunt body diverging in the airflow direction at a primary air outlet of the primary air pipe, the mixing time of secondary air airflow of the secondary air pipe and coal powder airflow is prolonged, the length of a flame formed by burning of coal powder at an opening of the primary air pipe isdecreased, and low-nitrogen burning is facilitated; meanwhile, by arranging the truncated-cone-type blunt body, the secondary air airflow of the secondary air pipe forms a strong backflow area at a secondary air outlet, the burning temperature in the pre-burning chamber is decreased, and the coking phenomenon in the pre-burning chamber is effectively avoided; and the truncated-cone-type blunt bodyand the pre-burning chamber are matched in use, therefore, the truncated-cone-type blunt body can suck high-temperature flue gas in a furnace in a rolling mode, the anti-interference capability of the pre-burning can be improved during burning, and accordingly the steady burning performance of the coal powder is improved.

Description

technical field [0001] The invention relates to a pulverized coal combustion device, in particular to a pulverized coal swirl burner. Background technique [0002] Pulverized coal combustion is mostly used in large boilers. Due to the large size of the furnace, the flame of the burner is long; and the heat load in the furnace of large boilers is relatively high, and the stable combustion ability is also strong. However, small boilers, especially industrial pulverized coal furnaces or industrial kilns, not only have poor combustion stability due to the small size of the combustion chamber, but also when ordinary burners are used for pulverized coal combustion, the burner flame is easy to wash the opposite wall, It will cause coking on the water wall of the boiler or even burn out and burst the tube, posing a safety hazard. Contents of the invention [0003] In order to solve the above technical problems, the present invention provides a pulverized coal swirl burner with sh...

AI Technical Summary

Problems solved by technology

However, small boilers, especially industrial pulverized coal furnaces or industrial kilns, not only have poor combustion stability due to the small size of the combustion chamber, but also when ordinary burners are used for pulverized coal combustion, the burner flame is easy to wash the opposite wall, Causes coking on the water wall of the boiler or even burns out the tube, posing a safety hazard

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