Pulverized coal conveying quantity control system for steel ball mill

Abstract

The invention belongs to the field of coal mill equipment, particularly relates to a pulverized coal conveying quantity control system for a steel ball mill, and the pulverized coal conveying quantity control system is used for controlling the pulverized coal flow rate in a plurality of pulverized coal conveying pipelines connected to a pulverized coal mother pipe. The steel ball mill coal quantity conveying control system comprises a plurality of connection seats, a plurality of fixing covers and rotating shafts; the plurality of connection seats are symmetrically and fixedly connected to the side wall of the pulverized coal mother pipe, one end of each connection seat communicates with the inner side of the pulverized coal mother pipe, and an opening in the other end of each connection seat is provided with a connection edge; the end of each fixing cover is connected with the connection edge on the opening of the corresponding connection seat; two rotating shafts are rotatably assembled between the two sides walls of each fixing cover, the rotating shafts are perpendicular to the axis of the pulverized coal mother pipe, the rotating shafts are fixedly connected with baffles, at least one ends of the rotating shafts stretch out of the outer sides of the side walls of the fixing covers, and the stretching-out ends of the rotating shafts are fixedly connected with shifting pieces. The pulverized coal conveying quantity control system is simple in structure, convenient to operate and capable of reducing the deviation of the pulverized coal conveying quantity of all the pulverized coal conveying pipes and reducing the deviation of heat provided by all combustors.

Description

technical field [0001] The invention belongs to the field of coal pulverizer equipment, and in particular relates to a steel ball pulverized coal delivery control system. Background technique [0002] At present, steel ball mills are widely used in the pulverizing system of power plants. Each steel ball mill is provided with multiple powder conveying pipelines, which respectively supply multiple burners to work at the same time. Due to the different resistance characteristics of each powder conveying pipeline, it is common There is the problem of uneven powder volume in each powder delivery pipeline and large deviation of heat provided by each burner, which leads to the deviation of the center of the boiler flame, which will cause a large deviation of smoke temperature between the left and right and front and back of the boiler, and the water wall is not heated. Even, in serious cases, it will destroy the normal water circulation, causing the water wall tube to overheat, exp...

AI Technical Summary

Problems solved by technology

[0002] At present, steel ball mills are widely used in the pulverizing system of power plants. Each steel ball mill is provided with multiple powder conveying pipelines, which respectively supply multiple burners to work at the same time. Due to the different resistance characteristics of each powder conveying pipeline, it is common There is the problem of uneven powder volume in each powder delivery pipeline and large deviation of heat provided by each burner, which leads to the deviation of the center of the boiler flame, which will cause a large deviation of smoke temperature between the left and right and front and back of the boiler, and the water wall is not heated. Even, in serious cases, it will destroy the normal water circulation, causing the water wall tube to overheat, expand or burst; the center of the flame is deflected, and the temperature difference between the left and right sides of the furnace outlet will be large, which will cause the local temperature of the superheater tube to be too high. In severe cases, there will be a tube burst phenomenon; the uneven heat load of the furnace will cause the local temperature in the furnace to be too high, so that the NO x The amount of formation increases, and it will also cause high temperature corrosion

In addition, the uneven load of the burner will have a great impact on the safety, economy and environmental protection indicators of the boiler operation.

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