Influence of cooling system temperature on the performance of vacuum pump unit

In summer, the temperature of closed water can reach 35 ℃. Therefore, it is difficult to guarantee the supercooling degree of 4.2 ℃ in the actual operation of vacuum pump. As the sealing water temperature approaches to saturation, its pumping capacity also decreases, until saturated vaporization and loss of working capacity.

The working pressure of the vacuum pump and the pressure of the condenser is a dynamic balance process. No matter how high or low the circulating water temperature is, the suction pressure of the vacuum pump must be lower than that of the condenser in order to pump the non condensable gas from the condenser. Therefore, the sealing water temperature of vacuum pump must be lower than the saturation temperature corresponding to the exhaust pressure.

The situation of vacuum drop is that the sealing water in the vacuum pump is vaporized because the water in the gas water separator is not changed in time. A few days later, the test was carried out on vacuum pump a of No.2 unit. After adding 16 ℃ cold water into pump a, the temperature of separator was 16.2 ℃. After starting pump a, the temperature rose to 24.5 ℃. With the increase of temperature, the vacuum decreased. When the water temperature was 30 ℃, the vacuum increased about 1kPa and the current of vacuum pump increased about 0.85a. When the working water temperature drops by 1 ℃, the vacuum increases by about 0.19kpa. It can be seen from the test that it is an important means to ensure the vacuum of the vacuum unit to ensure the lower temperature of the sealing water of the vacuum pump in summer.

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Unreasonable factors of process medium injection point of vacuum pump

In front of the first flange of the vacuum pump, the temperature of the gas inhaled is 238 ℃. The distance between the first flange and the rotor of the machine is not more than 400mm, and the gas flow rate is very fast and the time is very short. To reduce the process gas from 238 ℃ to 4.8 ℃, to meet the requirements of vacuum pump inlet temperature, the process design is to add a 1-inch pipe nozzle to the pump inlet flange, and inject ethylbenzene to achieve the cooling purpose.

The injection amount of ethylbenzene is regulated by the control valve on the pipeline. There are two problems: one is the unreasonable design of the injection point, which results in short cooling time and difficult to guarantee the suction temperature of the pump; the other is that once the control valve fails, the working temperature of the equipment will rise comprehensively, resulting in the pump failure.

In addition, before the vacuum pump is damaged, the contact wear between the rotor and the rotor and between the rotor and the shell has experienced a long time. During this period, abnormal temperature, abnormal sound and increased vibration occur. If the inspection personnel pay attention to it, the accident can also be avoided.

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