Automatic control system of coal bed loads of thermal power generating unit

Abstract

The invention provides an automatic control system of coal bed loads of a thermal power generating unit. The automatic control system comprises six layers of coal beds, a processing module, a coal bed commissioning sequence module and a coal bed decommissioning sequence module and is characterized in that: in a loading-up process, the processing module is used for commissioning the coal beds in sequence according to five load sections; and in a loading-down process, the processing module is used for decommissioning the coal beds in sequence through three load sections. According to the automatic control system, the automation control level of coordination control can be greatly increased, the loading-up speed and the loading-down speed are accelerated, human misoperation is reduced, the safety is improved, and a foundation is laid for unit-level automatic control.

Description

technical field [0001] The invention relates to a distributed control technology for a thermal power unit, in particular to an automatic control system for coal seam load of a unit. Background technique [0002] For coal-fired thermal power units, coal seam control including coal feeder and coal mill control in the distributed control system (DCS) is realized in the furnace safety control system (FSSS). At present, the coal seam sequence control is considered in the domestic DCS design, that is, the start-stop control of a single coal seam is automatically completed by the program, but due to factors such as equipment reliability and design perfection, few users actually use it frequently. As for the automatic control of coal seam load, that is, the function of automatically throwing and withdrawing coal seam according to the load command, there is no practical example in China before this. details as follows: [0003] 1. Single coal seam sequence control problem [0004]...

AI Technical Summary

Problems solved by technology

In the previous control, because the automatic coal seam switching control was not considered, the relationship between the measured coal volume and the actual pulverized coal volume blown out of the coal mill was not carefully considered when starting, stopping, tripping, and starting the coal seam. When cutting the coal seam, it has an impact on the actual fuel control

[0005] Disadvantages: The imperfect sequential control of single-layer coal seam will increase the running time of switching coal seam, and more importantly, it will interfere with fuel control, which will have a greater impact on supercritical units that need to emphasize coal-water ratio control

[0008] Disadvantages: manual input and withdrawal of coal seams will affect the response speed of load commands, and also affect the stability of system operation

Images