It would be a return, in a way, to a time when older steam engines once worked in the fields.
从某种程度上说，人们可能会回到旧蒸汽机工作在田野上的时代。
When the system pressure drops to the return pressure, the security valve will be closed and stop discharging, in the way of which the pipelines and equipments of the steam system will be protected.
当系统运行压力降低至安全阀的回座压力时，主蒸汽安全阀自行关闭，停止排放，从而对主蒸汽系统的管道和设备起安全保护作用。
SED recovery column reboiler temperature flow cascade control for steam condensate return.
抽提回收塔底蒸汽凝液温度流量串级控制。
The bottom of the water tank is connected with a water return pipe which is provided with a water return valve and is communicated with the steam pipe.
水箱底部连接有回水管，回水管上装有回水阀并且和蒸汽管连通。
This steam is then collected for use in other heat exchangers or discharged to the condensate return line.
这部分蒸汽会用于其他热交换器或者排放到凝结水回水管线中。
The trap remains closed until the steam cools and condenses into water. The bellows retracts to allow the water into the return piping.
疏水阀处于关闭状态，直到蒸汽足够冷却到凝结为凝结水。这时膜盒重新回缩并让水流进回路管道。
The plate falling film evaporator has advantages of high capacity, less steam consumption and high return water ratio but is not suitable for evaporation of solution with crystal liberation.
板式降膜蒸发器具有蒸水能力大、汽耗低、回水比高等优点，但不宜蒸发有结晶析出的溶液。 山西铝厂拜尔法母液中碳碱含量高，在蒸发过程中易析出。
The plate falling film evaporator has advantages of high capacity, less steam consumption and high return water ratio but is not suitable for evaporation of solution with crystal liberation.
板式降膜蒸发器具有蒸水能力大、汽耗低、回水比高等优点，但不宜蒸发有结晶析出的溶液。 山西铝厂拜尔法母液中碳碱含量高，在蒸发过程中易析出。
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