外文翻譯--蒸汽發(fā)生器水位模糊控制研究-文庫吧
2025-04-17 05:57 本頁面
【正文】 y(s)=GW(s)QW(s)+GS(s)QS(s) （ 1） where y is the steam generator water level。 QW for the water flow。 QS for the steam flow。 GW (s) for the impact of the water flow to the steam generator water level。 GS (s) for the effect of the steam flow (load) to the steam generator water level. The balance of the steam generator water level is maintained through the match between the water flow and steam flow. The process that water level changes with the steam flow or water flow changing can be regarded as a simple integration process, but impact of the water flow and steam flow ?s change on water level is different. A. Dynamics Characteristics under Water Flow Disturbance Suppose steam flow GS remains unchanged, and water flow GW step increases, on the one hand because the temperature of feed water is much lower than the temperature of saturated water in the steam generator, so that , when feed water entering, it will absorb a lot of extra heat, the vapor phase bubble contents will reduce, resulting in water level decreasing。 on the other hand, the increase in water flow GW made it greater than steam load, and cause water level increases linearly. Comprehensive two factors, after the step increase of the water flow, the water level rise has a time delay process, showing a down then up. B. Dynamic Characteristics under Steam Load Disturbance Suppose feed water flow GW remains unchanged, and steam load GS step increases, on the one hand the water level will flow down because the steam flow rate is greater than the water flow rate. On the other hand, as the steam load increased, vapor pressure is reduced。 the bubble volume on the liquid surface increases, causing the water level increased. Comprehensive two factors, after the step increase of the steam flow rate, the water level down has a time delay process, showing a up then down. The impact on the water level of water flow or steam flow stepping decreased has similar principle as above. As analysis can be seen as above, when the water flow or steam load change, the water level did not follow the change immediate
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