Pulverized coal flow regulating valve of boiler air and powder pipeline and control method of pulverized coal flow regulating valve

Abstract

The invention provides a pulverized coal flow regulating valve of a boiler air and powder pipeline and a control method of the pulverized coal flow regulating valve. Pulverized coal flow regulating valves are arranged between a coal mill and a plurality of pulverized coal pipelines connected with the coal mill; each pulverized coal flow regulating valve comprises a regulating valve body, a permanent-magnet servo actuator and a straight-tooth speed reducer which are installed on an outer casing of the regulating valve body, a double-comb-tooth type valve plate rotationally connected inside theregulating valve body as well as bearing blocks installed on the regulating valve body and located on the two sides of the double-comb-tooth type valve plate, the permanent-magnet servo actuator drives the straight-tooth speed reducer, an output shaft of the straight-tooth speed reducer drives the double-comb-tooth type valve plate to rotate in the regulating valve body in the radial direction ofthe regulating valve body towards the axial direction, and the double-comb-tooth type valve plate is composed of a central blocking plate and a comb tooth plate integrally formed with the central blocking plate. The pulverized coal flow regulating valve has the advantages that the pulverized coal distribution balance of each conveying pipeline of a coal pulverizing system and the uniformity of airand powder in branch pipes are improved through the pulverized coal flow regulating valve, and good combustion conditions in a furnace can be formed.

Description

technical field [0001] The invention belongs to the technical field of pulverizing systems, and more specifically relates to a pulverized coal flow regulating valve and a control method for a pulverized coal pipeline of a boiler. Background technique [0002] The coal mill and several pulverized coal pipelines connected to it form a pulverizing system. The pulverizing system is responsible for grinding raw coal into pulverized coal with qualified fineness, and transporting it to the boiler for combustion. The distribution of pulverized coal in each conveying pipeline of the pulverizing system is unbalanced, the deviation of the pulverized coal in each branch pipe is large, and the air-to-coal ratio deviation is large, resulting in insufficient mixing of the pulverized air in the later stage, unsatisfactory combustion conditions, slow load response, and high combustibles in the furnace , the air powder in each branch pipe is uneven, and the rope winding phenomenon occurs. If ...

AI Technical Summary

Problems solved by technology

The distribution of pulverized coal in each conveying pipeline of the pulverizing system is unbalanced, the deviation of pulverized coal in each branch pipe is large, and the air-to-coal ratio deviation is large, resulting in insufficient mixing of pulverized air in the later stage, unsatisfactory combustion conditions, slow load response, and high combustibles in the furnace , the air powder in each branch pipe is not uniform, and the phenomenon of rope winding occurs. If the air and coal powder in the stratified state enter the burner, it will cause unstable flame, uneven combustion, increase of unburned carbon, slagging, and scour the furnace Phenomena such as wall, CO and O2 imbalance

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