外文翻譯---三坐標測量機測頭的誤差校準-其他專業(yè)-展示頁
2025-01-31 09:17本頁面
【正文】 have quick realtime response and high reliability 。manmachine interface must be good at the operator station including operating terminal and largearea display that provides synthetic menus and information about the whole production process for the operators. Structure of Automation Control system of the power unit The design of automation control system of thermal power unit mainly includes control, alarm monitor, protect etc . In accordance with the above analysis .So we divide the plex system into several subsystems in order to make the whole system optimal . （ 1.） Data acquisition system(DAS):It is information center of whole system and provides credible rapid objective operating records ,which is the base of safe and economical operating of equipments .Function of ,print of accident list and incident review ,property calculate ,operate guidance etc… （ 2） Boiler control system :Boiler control system such as boiler bustion ,steam temperature ,feedwater ,auxiliary control system and the boiler safe supervisory system and boiler bustion management system. There subsystem coordinate each other and make boiler operate in safe ,efficient and steady state to satisfy the load instruction of power work in various operating modes . （ 3.） Steam turbine control system :Steam turbine control system realizes load control and rotative velocity control of steam turbine by DEH (Digital ElectroHydraulic ).In addition ,the auxiliary system of steam turbine include the deoxygenation water lever control ,deoxygenation pressure control ,the condenser hot well water level control and the heater water lever control etc （ 4.） Auxiliary system :Besides the main systems mentioned above ,the auxiliary system also has bypass control system etc… The main system and auxiliary system are a anic whole through close connection of information munication work .They are interpermeable and .Interdependent so as to form the main part of the automation control system of the largescale unit. Design of Automation Control System of the Thermal Power Unit From the system point of view, we analyze and study the principle of two basic feedback control method early that “boiler follows steam turbine” and “steam turbine follows boiler” in order to find out the existent problem ad be able to design more reasonable control method. Boiler follows steam turbine mode This kind of control mode is first to let steam turbine trail the needs of power work load ,then let boiler trail steam turbine .Its advantage is to be able to fully use the heat accumulation of boiler ,make the unit meet the change of power work load paratively quickly.. But because the inertia and delay of boiler are greater ,the regulation of former turbine pressure pt cannot follow the speed of load regulation, thus pt has greater fluctuation, which is disadvantageous to the steady operation of boiler .The range and speed change of the unit’s output must be restricted . . Steam turbine follows boiler mode This kind of control mode is first to let boiler train the needs of power work load, then let steam turbine train boiler .It can be better to maintain steam pressure stabilize and beneficial to boiler steady operation .But it do not fully utilize the heat accumulation f boiler to re
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