Thread Content
The vaporization of vaporized water in a hydrophobic pump has a certain relationship with temperature and pressure. Under a certain pressure, when the temperature rises to or exceeds the saturation temperature at that pressure, water begins to vaporize; if at a certain temperature, the water also vaporizes when the pressure drops to the vaporization pressure corresponding to the temperature or below. If during the flow process, the pressure in a certain local area is equal to or lower than the vaporization pressure type corresponding to the water temperature, the water will vaporize there. The harm of vaporization in the hydrophobic pump will be great. The vaporization will cause great damage to the water pump. This damage is generally called "cavitation". When water vaporizes, a large number of bubbles are generated. When the bubbles enter the high-pressure parts of the pump with the water, they quickly condense and burst under the action of high pressure. At the same time, they produce noise and vibration, and corrode the materials of the components flowing through. This erosion is mainly caused by the physical impact in front of the chamber where the bubbles are condensed and broken, and the surrounding water quickly fills the original bubbles. The vaporization of the heating network dewatering pump not only produces noise and vibration, but also causes cavitation damage to the pump body components, and may even cause the heating network heater to detach. During the treatment process, it will also affect the operation of the lower-level heating network heaters. In severe cases, it will affect the operational safety of the entire heating network system. The reasons for the vaporization of the heating network drain pump are that the heating network heater drain volume is reduced or the air door of the pump is closed by mistake; the heating network heater inlet valve is mistakenly closed, the intake adjustment door is closed by mistake or is closed too quickly; the circulating water volume of the heating network increases too fast; the water temperature at the entrance of the heating network heater drops; the water level of the heating network heater is too low; a vortex forms at the inlet pipe; the inhaled gas is vaporized; the pump outlet pressure motor current swings and decreases; the pump outlet flow swings and decreases; The water level of the heating network heater changes drastically or is impacted; the pump casing generates heat and makes abnormal noises. To deal with the vaporization of the heating network drain pump, when there is a margin for the heating network inlet steam, open the steam inlet adjustment door appropriately or close the pressure regulator to increase the steam side pressure of the heater. Reduce the circulating water flow of the heating network appropriately to increase the steam side pressure of the heater. Check that the air door of the drain pump should not open. If allowed, the unit load can be increased and the heater steam side pressure can be increased. Close the drain pump outlet door. Replace the backup drain pump. Turn the dewatering pump frequency converter into manual mode to reduce the speed of the dewatering pump. After it becomes normal, gradually increase the speed until it returns to normal. When the variable frequency pump and the fixed speed pump are running at the same time, the fixed speed pump can be stopped first and then start again after the fixed speed pump runs normally. Open the water injection gate at the inlet of the hydrophobic pump and the peak inlet water temperature is low.