The sealed water pump is to provide enough sealed cooling water for the vacuum pump. Under normal conditions, the water volume is 200 L / min, and the temperature is 10 ~ 30 ℃. The circulation process is: sealed water pump → sealed water cooler → vacuum pump → gas water separator → sealed water pump. The water storage capacity of the gas water separator and the whole system is 2 m3. The water replenishment and consumption of the unit in normal operation are less.
In the suction system of the vacuum unit, the air extractor has two air suction ports. When the vacuum pump is just started, the air in the vacuum system of the condenser enters the vacuum pump through the bypass of the air extractor, and then enters the steam water separator together with the working water. When the negative pressure at the inlet of the vacuum pump reaches 13.3kpa, the air extractor is actually started and put into operation, and the bypass valve of the air extractor is automatically closed. Under normal conditions, when the air extractor operates for 30min, the negative pressure in the vacuum system of the condenser can reach the required vacuum value.
The air leakage measurement system is set in the vacuum pump set, which can measure the air leakage into the vacuum system at any time safely and conveniently. The method is to change the status of the movable air converter of the ejector at the inlet of the driving air from the air flow direction to the direction of the separator, that is, the air in the separator is used as the driving air source of the ejector, and the air exhaust valve on the upper part of the tight air-water separator is closed, so that the true air system of the whole unit forms a closed system, at this time, all the leakage air flow measuring devices are opened The inlet valve can easily get the air leakage of the vacuum system. In this process, the vacuum pump group has been in normal operation, and the vacuum system of the whole unit is not affected. When the air leakage of air leakage measuring device is 5kg / h, the corresponding vacuum tightness is 26.66pa, and when the air leakage is 25kg / h, the corresponding vacuum tightness is 133.3pa. Therefore, as long as the air leakage is less than 25kg / h in each test, it can be considered that the vacuum system tightness test of condenser is qualified.
In addition, the ejector heater is also set in the system. When the temperature of the vacuum pump area is lower than 10 ℃, in order to ensure the stable operation of the system, the heater must be put into operation.