外文翻譯---plc在蒸汽鍋爐汽包液位pid控制系統(tǒng)的應(yīng)用分析-全文預(yù)覽
【正文】 es, causes to close slightly for the water regulating valve. Otherwise, when the water level reduces, the adjustment module output value increases, causes to open in a big way to the water valve. The practice proved three impulses can maintain the water level for the water single pole regulator system stably, also gives the water regulating valve movement to be steady. The boiler also has a quite important control loop for the aqueous system in is for the hydraulic pressure return route, because the steam drum internal pressure is higher, must make up the water to the boiler to have to provide a higher pressure, enhances the hydraulic pressure for the hydraulic pressure return route function, enables the water normally to pour into the steam drum. But in the steam current capacity had not achieved when full load, to gives the water current capacity the request not to be high. Generally uses the feed pump in the old style boiler system continuously by the labor frequency way revolution, reduces the hydraulic pressure with the return valve to prevent the cartridge igniter, now generally uses through the frequency changer constant pressure water supply way control hydraulic pressure. Boiler to water volume through steam drum fluid position adjustment. The steam drum fluid position survey selects floats the tube liquidometer. For the effective use transformation waste heat, reduces the consumption, decreases the labor intensity, is advantageous is stable to the overall craft, requests the steam drum fluid position automatic control, when regular production the undulation should be smaller than 177。 But the water level excessively low can destroy the soft drink circulation, is serious when causes the explosion of a boiler, therefore the boiler steam drum water level must strictly control. In order to guarantee the boiler to produce stable, reliable and the economical movement, we designed use the performance to be advanced the boiler PID automatic control system which forever great automatic equipment and so on FBsPLC, frequency conversion velometer, puter application will pose. This control system through examination water vapor pressure, temperature, movement physical quan
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