Multi-channel active protection control system based on plc and dcs

Abstract

The invention relates to a multi-channel active protection control system for an industrial-boiler pulverized coal storage and supply system. The multi-channel active protection control system comprises a sequential generator, a function generator, a square-wave generator, an output channel selector and a digital signal output unit; the output bit of the sequential generator is stared and stoppedbit by bit in accordance with the specified timing sequence through the sequential generator according to time cycle requirements and work sequence requirements; an input signal of the function generator is a duty ratio of the current load to the standard, the output control duty ratio is transmitted to the square-wave generator through multiplication, and the square-wave generator is used for adjusting and controlling the jetting working time and the jetting suspend time in the jetting cycle of compressed air and inert gas in the pulverized coal storage and supply system; the output channel selector receives the square-wave sequence from the sequential generator and the square-wave with the adjustable duty ratio; and the digital signal output unit is an external output channel of the control system. The multi-channel active protection control system can be highly integrated with a boiler thermal control system and reduce the number of field hardware controllers.

Description

technical field [0001] The invention relates to a boiler pulverized coal storage and supply control system, in particular to a multi-channel active protection control system based on PLC and DCS. It belongs to the technical field of boiler control systems. Background technique [0002] Industrial pulverized coal boilers use pulverized coal as fuel. The storage and delivery of fuel is a complex process. Due to the special physical and chemical characteristics of pulverized coal used in industrial boilers, the pulverized coal storage and supply system for industrial pulverized coal boilers must solve the problem of safe storage. Also need to solve the problem of stable delivery. [0003] The conditions for spontaneous combustion of pulverized coal are: 1. There is oxygen in the pulverized coal bin; [0004] The characteristics that exist in the combustion process of industrial pulverized coal boilers are: ①There is a dead angle in the pulverized coal storage and supply syste...

AI Technical Summary

Problems solved by technology

[0004] The characteristics that exist in the combustion process of industrial pulverized coal boilers are: ①There are dead corners in the pulverized coal storage and supply system, and the pulverized coal is easy to accumulate and volatilize, and the temperature rises, which is easy to cause spontaneous combustion; Changes in storage bulk density affect the stability and continuity of unloading, etc.

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