ANALYSE AND DESIGN OF WHOLE-PROCESS FEEDWATER CONTROL PROGRAMME FOR 300MW UNITS
Abstract
With the development of the technology, the automation level of thermal power plants has been raised. The automation of whole-process feedwater control is one of a representative
This paper described a 300 MW unit of whole-process feedwater control system, Stability of the drum water level is an important indicator of safe operation for drum boiler. This paper analysis of the operating trait of the water control targets at first, and elicit the basic programmer of the boiler feedwater control system: When in the low-load, we regulate the feedwater by changing the bypass control valve, controlling the level of the drum using one-element system. When in the high-load we change the feed capacity by changing the rev of the feedwater pump, controlling the level of the drum by using three-element system. Among the various systems, pumps and valves can be switch over in no interference; at the same time the controller of the drum water level, steam flux and feedwater flow are controlled by computer. We analyze the SAMA Fig of whole-process feedwater control system by linking up with Henan Hebi Wanhe power generation limited liability Company; and do the in-fi90 configuration for main feed water control system.
Keywords: whole-process feedwater; one-element control; three-element control；drum water level.
