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Studies on the Control over Coal-Conveyance of Power Plants

Author: SunHongGang
Tutor: ZhengZongHe；WangLiMin
School: Tianjin University
Course: Thermal Power Engineering
Keywords: coal-conveyance control systems process control programmable logic controllers (PLC) process control systems(PCS7)
CLC: TM621.7
Type: Master's thesis
Year: 2009
Downloads: 68
Quote: 0
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Abstract


Coal, which is the most important element for thermal power plant, can not be lacking even for one minute. Traditional coal-conveyance systems of power plants are based on relay contactors and artificially manual semi-automatic systems. Due to the adverse circumstances at the coal-conveyance spots, the workers’health is greatly harmed. What’s more, because power plants occupy a large area, it is often seen deviation and crack of belts, as well as coal drop-tube plug. Thus, the productivity of power plants is greatly reduced. However, the increasing capacity of power plants, together with the consideration of those factors, such as sources, coal varieties and climatic conditions, ect, and increasing configuration scales of those thermal power plants and coal-conveying systems, traditional coal-conveying system can not satisfy the needs of those power plants. In order to reduce the labor intensity for operating workers, enhance the efficiency and the secure operation level, the installation of whole coal automation control devices, consisting of transmission and distribution systems will be imperative.This paper gives full consideration of the effect and running reliability of coal-conveyance systems. Taking full account of the belt-conveyers’failures and the reliability factors, a more than two segmented mutual back-up system is designed based on practices, which structurally ensures the running reliability of the coal-conveyance systems. The control of the coal-conveyance systems, with a characteristic of big delay of the objects, belongs to the automated process control field. In this paper, the process control system and associated control technology and control systems (such as: the operation control system, direct digital control system, computer supervision and control system and distributed control system) are analyzed. Besides, a series of related control theories, such as the adaptive control, fuzzy control, forecasting control and humanoid intelligent control are introduced.In this paper, detailed analysis is made on the coal-conveyance and control system of Hongwei coal power plant of Daqing Group. Then, the existing problems and failed function of present coal control system are posted. Targeted on the development of Hongwei’s program-controlled coal-conveyance technology, the author analyzed the functional demand for program-controlled coal-conveyance system, studied the overall proposal of the improvement of program-controlled coal-conveyance system and designed a program-controlled system of the coal-conveyance program. The program not only greatly enhances the reliability and maintainability of the process, reducing maintenance workload, but also provides conditions for future upgrades and the realization of optimal control of coal-conveyance systems.

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CLC: > Industrial Technology > Electrotechnical > Power generation, power plants > Power plant > Thermal power plants, thermal power stations > Auxiliary equipment
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