(完整 word)基于 PLC 控制的火电厂输煤系统设计
Abstract
Since 1996 our country's power is ranks second in the world ， and in my
country is rich in coal resources ， thermal power plants are mostly coal-fired
power plants， coal conveying system in thermal power plants is an important part
of it. Due to thermal power plants running in the environment and the intensity of
labor is big， we want to desperately want to work with a kind of human to replace
our human manual labor. Change this time is human invented the programmable logic
controller （ programmable logic controller ， PLC), according to the actual
situation of power plant， commonly used in automated reconstruction project of a
coal conveying system programmable logic controller to realize the automatic
detection and control of the production equipment. Power plant coal SPC system
generally includes coal unloading system， storage system， coal and coal blending
system parts ， composition of equipment and more dispersed, strong interlocking
relationship between equipment ， equipment operation safety conditions ，
reliability requirements of higher characteristic ， generally USES the
programmable controller (PLC ） as the main control equipment monitoring and
control system to implement the control of the entire process。
Based on the understanding of coal， on the basis of process and equipment，
through the flow chart of coal and coal conveying belt protection figure
statistics the number of devices, and statistics needed, the number of I/O points
of PLC selection。 Introduces the application of PLC in the coal conveying control
system， mainly through the coal conveying belt control, control of coal plough up
down and impeller coal feeder control, finally bring forward the control strategy
of a coal conveying system. Coal—fired power plants were improved working
environment， improve the efficiency of coal—fired power plants。
Key Words Coal Blending System，PLC,heat-engine plant
