The function of mechanical seal sealing water of circulating feed water pump
(1) Although the high-pressure water in the circulating feed water pump passes through the seal, it still has a certain pressure. In order to prevent the water in the feed pump from leaking through the gap between the shaft and the seal, it is removed from the condensate pump outlet or demineralized water. The main pipe uses water as sealing water.
(2) The water in the circulating feed water pump is water with a certain temperature. The high-temperature water transfers heat to the bearing through the pump shaft or the metal of the pump body, which increases the bearing temperature. In order to control the heat transfer, the sealing water also plays a cooling role.
(3) When the sealing water passes through the seal, the water forms a water film between the shaft and the seal to prevent the gap between the shaft and the seal from leaking, causing a large amount of working fluid loss; at the same time, high temperature feed water will pass through The pump shaft and pump body metal transfer heat to the bearing to increase the bearing temperature. In severe cases, the bearing will be burnt; the gap between the high-speed rotating shaft and the seal is very small. When the sealing water is lost, the water film here is also destroyed, and the shaft and the seal are likely to be rubbed. The vibration of the water pump increases, which will cause equipment damage in severe cases. The return water of the sealing water is generally introduced into the condenser with a multi-stage water sealing pipe.
