Fully automatic pulverized coal flow rate regulating valve installed on the pulverized pipeline of pulverizing system

Abstract

The invention discloses a full-automatic pulverized coal flow speed adjusting valve installed on a powder conveying pipeline of a powder manufacturing system. The full-automatic pulverized coal flow speed adjusting valve comprises a valve body and a valve element arranged in the valve body. The valve element comprises an upper semi-body, a lower semi-body, a drive device and a detection device, wherein the upper semi-body is of a sleeve shape with the upper end closed, the outer wall of the upper semi-body is fixed to the inner wall of the valve body through a plurality of supports arranged in the circumferential direction, the upper end of the lower semi-body is fixedly provided with an outer sleeve arranged on the outer wall of the upper semi-body in a sleeved mode, the drive device is used for driving the lower semi-body to vertically move, and the detection device is used for detecting the position of the lower semi-body. The lower semi-body of the valve element vertically slides in the valve body, the flow area between the bottom face of the lower semi-body and the inner wall of the valve body changes in a gradually-contracting mode from bottom to top until the portion with the minimum throttling area is reached, and finally the effect of adjusting the resistance of the pulverized coal conveying pipeline system is achieved by changing the air flow speed of pulverized coal.

Description

technical field [0001] The invention relates to the field of combustion control of pulverized coal boilers in large-scale coal-fired power plants, in particular to a fully automatic pulverized coal flow velocity regulating valve installed on a pulverized powder conveying pipeline of a pulverizing system. Background technique [0002] The coal pulverizer of the pulverized coal boiler of a large coal-fired power plant generally adopts a direct blowing pulverizing system to provide pulverized coal for the burner, and the number of burners in each group is 4 to 8. According to boiler design codes and standards, the deviation of pulverized coal mass flow distribution between each group of burners should be less than ±10% (ratio to the average value of all pulverized coal tubes). The main factors that determine the distribution deviation of pulverized coal are the deviation of flow resistance between pulverized coal pipes, the deviation of pulverized coal concentration, the finene...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to solve the problem that the pulverized coal flow velocity deviation in the coal pulverized pipe of the coal mill is relatively large

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