... change of cross level 平面性 feed change level 进刀变速手柄 change in staffing level 员工级别变更 ...
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Procedure of manually combing large size unit's Feed water Pump is complex and easy to cause much change of drum level.
大机组给水泵手动并泵操作复杂，易造成汽包水位大幅波动。
At the high load condition, change the rotating speed of steam or electricity feed water pumps to ensure the water level of the drum.
高负荷时通过改变给水泵转速改变给水量，用三冲量系统控制汽包水位。
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