Pneumatic dust cleaning device of boiler

Abstract

The invention relates to a pneumatic dust cleaning device for cleaning accumulated dust in a coal-fired boiler furnace arch and a horizontal flue. The accumulated dust piling friction is overcome and a dust accumulation layer is in the fluidization state by utilizing pneumatic (steam-driving), moving beds and fluidization theory, and ultimately the accumulated dust flows back to a hearth or is raised by the fume to be discharged through a cold dust funnel and a tail part flue, thereby achieving the dust cleaning effect. The dust cleaning device consists of components of dust blowing tubes, dust blowing nozzles (hoods), a wearing plate, dust blowing medium conveying pipelines, adjusting valves, a temperature measuring device, a control system and the like, wherein the dust blowing tubes are clung to a wall-surrounding tube film and arranged regionally, then flexible control in dust blowing in different areas is realized; and the distances and the relative angles of the dust blowing nozzles and wall-surrounding tubes can be selected according to demands. By utilizing the pneumatic dust cleaning device, the accumulated dust in the coal-fired boiler furnace arch and the horizontal flue can be effectively eliminated, a heated surface is kept clean, the efficiency of the boiler is improved, and the safety in operation of the boiler is ensured.

Description

technical field [0001] The invention belongs to the technical field of boilers, and relates to a boiler ash removal device, in particular to a pneumatic ash removal device for coal-fired boiler refraction corners and horizontal flue ash deposits. Background technique [0002] Boiler heating area ash is unmelted solid ash deposited on the heating surface, mainly occurs on the heating surface of the boiler panel superheater, reheater, economizer and air preheater. The ash in the heated area has become an important factor hindering the safe and economical operation of coal-fired generating units. The load requirement needs to increase the amount of fuel to increase the heat transfer, which will eventually lead to an increase in coal consumption of the unit; (2) Ash and slagging on the heating area will accelerate the corrosion of the heating surface pipes and shorten the service life of the heating surface; (3) Ash accumulation on the heating area Severe slag will lead to equi...

AI Technical Summary

Problems solved by technology

At present, the common soot removal devices on coal-fired power plant boilers include steam soot blowers, sonic soot blowers, and gas pulse soot blowers, etc., but they all have their own shortcomings, such as steam soot blowers. The heating surface is damaged and the energy of soot blowing is limited. In particular, these soot blowing devices cannot effectively remove the soot deposits in the refraction angle and the horizontal flue.

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