Swirl injection type pulverized fuel burner

Abstract

The invention discloses a swirl injection type pulverized fuel burner which is characterized by comprising a structure of an annular air passage (1), a mixed air passage (2) and a center air passage (3), which is composed of three layers of concentric sleeve pipes: an outer layer steel pipe (03), a middle layer steel pipe (04) and a center steel pipe (05).In the invention, the structure of the annular air passage, the mixed air passage and the center air passage which are distributed from the outside to the inside is adopted, a rotational flow wing panel is arranged at an outlet of the annular air passage, a cyclone opening is formed, a horn mouth shape pipe opening with a plurality of cone edges is arranged at the outlet end of the center air passage, the technical scheme of a flow expansion cone which is used as a center nozzle opening and the mixed air passage is adopted, and the problems and the defects in the prior art that the distance between flame and the nozzle opening is difficult to regulate, the temperature at the nozzle opening is overhigh, an ignition appliance needs to be specially arranged, and the burner is not adaptable to the small-and-medium-sized boilers are overcome.The swirl injection type pulverized fuel burner enables the pulverized fuel burner to achieve the aims that automatic ignition can be realized, the distance and volume of flame torch can be regulated, and the burner is adaptable to the small-and-medium-sized boilers.

Description

technical field [0001] The invention relates to a burner, in particular to a swirl injection pulverized coal burner used for injecting combustion air and pulverized coal mixed fluid. Background technique [0002] The swirl type pulverized coal burner of the prior art is composed of a primary air duct, a secondary air duct, primary and secondary air spouts, and a diffuser cone arranged in front of the primary air spout. The air that transports the pulverized coal is called primary air, and the mixture of pulverized coal and air is sprayed into the combustion chamber through the primary air nozzle of the burner for combustion. The air flow merges with the primary air at the outlet of the burner to form a rotating jet of combustion. The negative pressure formed in the center of the jet will suck the high-temperature smoke to the root of the flame. This part of the high-temperature smoke is the main heat source for the subsequent combustion of pulverized coal fluid. . The diff...

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Problems solved by technology

[0003] The swirl type pulverized coal burner in the prior art is usually suitable for large-scale combustion furnaces such as power plants and cement plants. The distance between the flame and the nozzle is relatively short, and it is difficult to adjust after setting. The temperature at the nozzle is too high, and expensive high-temperature-resistant It is made of high-quality materials and needs to be equipped with a special ignition device, which is not suitable for the problems and shortcomings of the application of small and medium boilers.

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