The Study And Implementation Of Control System Of Coal-fired Steam Boiler Of Oil Fields

Steam drive oil recovery is the method in which high pressure steam with suitable dryness fraction is injected into heavy oil stratum. Crude oil and nature gas are the main burning material of steam-injection boiler in the past. In order to reduce the fuel cost, Many kinds of steam-injec--tion boiler burning pulverized coal has been developed, after the project of "replace oil with coal" in our country. There are still many important condition needed to be solved because of the changing of burning mode. It is based on the steam-injection boiler burning pulverized coal Liaohe oil field. Plenty of research has been done aim at improving automatic level of the control system.Based on the systematic expatiation on technologic process of steam-injection boiler,this paper analyzes the control effects that the control system of steam-injection boiler must achieve and puts forth the difficulties that control system may encounter. Dryness fraction and steam pressure are the important parameters of steam-injection boiler. They are bottlenecks that hamper the safe and economical operation of steam-injection boiler too.So,steam pressure,the scale of wind and coal fuzzy control system has been designed based on the colected real-time data due to many variation and random disturbance. The constant pressure control strategy has been design in dryness fraction control.Dryness fraction is measured by detecting inlet water and output water conductor analysis during the implementation of dryness fraction control strategy. Feedforward-feedback control technology that is good for engineering has been adapted to the system based on analysis of its primary efect. Good resolution and stability has been obtained. Besides, the hardware of the control system are achieved and some of the monitor and control software has been programmed.The control system of steam-injection boiler propose in this paper has been applied in steam-injection boiler of Liaohe oil field successfully. This control system has enchanced the steam quality to large extent ane has reduced the consumption of energy. It han an excellent control performance.