2017-6-2 Purification Technology Edition Daily Question
Thread Content
1. The function of the pre-pump in the feed water pump set is ( ). 2. The feed water pump is not allowed to operate below (). 1. Increase the inlet pressure of the feed water pump to prevent cavitation in it. 2. Minimum flow rate. Note: Answers to this question must be submitted within three days! ! ! ! ! ! ! ! ! ! ! ! ! !
1. Increase the inlet pressure of the feed water pump to prevent cavitation in it. 2. Minimum flow rate
1. To improve the economic efficiency of the deaerator during variable-pressure operation, while ensuring the safe operation of the feed water pump, it operates in series with the feed water pump. 2. Minimum flow rate
1. Increase the inlet pressure of the feed water pump to prevent cavitation in it. 2. Minimum flow rate
1. To improve the economic efficiency of the deaerator during variable-pressure operation, while ensuring the safe operation of the feed water pump, it operates in series with the feed water pump. 2.25%—30%
1. Function of the feedwater pre-pump: To improve the economic efficiency of the deaerator during variable-pressure operation, while also ensuring the safe operation of the feedwater pump, it operates in series with the feedwater pump. (1) Due to the low operating speed of the feed pump, a smaller backflow height at the pump inlet is required (i.e., a lower cavitation margin), which reduces the installation height of the deaerator and saves on the construction costs of the main building ； (2) After being pressurized by the pre-pump, the outlet head of the feed water is higher than the required limited cavitation margin for the feed water pump as well as the additional vaporization head at low flow rates, effectively preventing cavitation in the feed water pump. 2. The feed water pump is not allowed to operate at flow rates below (minimum flow)
1. After being pressurized by the pre-pump, the outlet head of the feed water is higher than the required net positive suction head of the feed pump as well as the additional vaporization head at low flow rates, thereby effectively preventing cavitation in the feed pump. 2. Minimum flow rate
Preventing cavitation in the feed water pump: minimum flow rate
1. The function of the pre-pump in the feed water pump set is to (increase the pressure at the inlet of the feed water pump and prevent cavitation in it). 2. The feed water pump is not allowed to operate at a flow rate lower than (minimum flow).
1. Prevent cavitation in the feed water pump； 2. Minimum flow rate
1. Increase the inlet pressure of the feed water pump to prevent cavitation in it. 2. Minimum flow rate