Coal-fired boiler pneumatic soot blowing system with circular lower spray pipe type nozzle and soot blowing method

Abstract

The invention discloses a coal-fired boiler pneumatic soot blowing system with a circular lower spray pipe type nozzle and a soot blowing method. The coal-fired boiler pneumatic soot blowing system comprises a cylindrical air chamber, an air chamber seal head and a lower spray pipe, one end of the cylindrical air chamber is provided with a sunken interface for connecting a compressed air or steammedium pipeline, the air chamber seal head is welded to the other end of the cylindrical air chamber, a plurality of air ports are formed in the upper portion of the cylindrical air chamber, and the lower spray pipe is welded to the positions of the air ports in the outer wall of the cylindrical air chamber. The nozzle is arranged in an area where ash is easy to accumulate in horizontal and tail flues of a coal-fired boiler, compressed air or steam is used as a medium for blowing ash, enters from the cylindrical air chamber, flows into the lower spray pipe from an air hole in the upper portionof the air chamber, and is sprayed out from a nozzle of the lower spray pipe; and the medium is directionally sprayed towards the wall surface or the heat exchange surface of the flue through the nozzle of the lower spray pipe, accumulated ash in the flue is blown and fluidized, all-directional blowing around the nozzle is guaranteed, disturbance to the accumulated ash is enhanced through directional jet flow of the lower spray pipe, and the problem of accumulation of the accumulated ash in the flue is effectively solved.

Description

technical field [0001] The invention relates to a coal-fired boiler pneumatic soot blowing system with a circular downspray nozzle and a soot blowing method, which is mainly used for directional pneumatic soot blowing at the level and tail flue of a coal-fired boiler in a thermal power plant where ash is seriously accumulated. Effectively solve the problem of ash accumulation in the horizontal and tail flue of coal-fired boilers. Background technique [0002] When coal-fired boilers in large-scale thermal power plants are in operation, a large amount of ash deposits are usually generated in the horizontal and tail flues. safe operation of coal-fired boilers. [0003] When coal-fired boilers in large-scale thermal power plants are in operation, soot is easy to accumulate in the horizontal and tail flues. The horizontal flue forms a negative pressure recirculation zone in a certain area due to the flow of flue gas. As a result, the soot in this part of the flue cannot be carr...

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Problems solved by technology

Among them, the nozzle, as a key component, has a single structure, and there

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