In recent years, a dry vacuum system has been developed, which uses dry mechanical pump to make up the system. The dry system is energy-saving, environmentally friendly, safe and does not use steam. The steam jet pump was used as the vacuum equipment in Baotou Steel Plant, which was also widely used in the world at that time. However, it has great shortcomings. Therefore, many companies want to reform the VD vacuum system.
The biggest disadvantage of steam jet pump as vacuum pumping equipment is high operating cost, high steam consumption and high energy cost. And every time before the formal use must try to pump a few heats to achieve the vacuum degree, just cleaned up the tank situation is more serious. In addition, due to the influence of superheated steam quality fluctuation, it is difficult to control the system working state and process stability. Especially in winter, there are many steam users, and the unstable temperature and pressure often cause the problem that the vacuum degree can not be reached; the maintenance cost of the vacuum equipment of the steam jet pump is also very high, so it is often necessary to remove the nozzle for cleaning. In order to reduce the temperature of steam pumps at all levels, a large amount of circulating cooling water is needed, and the power consumption is prominent.
dry vacuum system principle and composition
Dry vacuum pump system is composed of dry mechanical pump system, so it does not need steam and a lot of water, and its operation cost is very low. In order to meet the environmental requirements of the pump group, the dry-type vacuum pump system needs a dust collector to filter out the particle dust entering the mechanical pump group.
EVP vacuum pump manufacturer is recommended to select screw vacuum pump and roots vacuum pump matching combination of vacuum system in VD production of Baotou Steel. The principles of the two are introduced below.
The principle of screw vacuum pump is that two screw rotors rotate in opposite direction to complete the process of suction and exhaust. It has the following characteristics: in the internal compressed gas, the compression ratio is high (more than 100), it can operate in high pressure difference (0 ~ 100KPA), can be used alone, directly discharged to the atmosphere, and the pumping speed is relatively low. But because of the slow pumping speed of screw pump, it is rarely used alone, generally more than two are used together to improve the pressurization effect.
Roots vacuum pump is a positive displacement vacuum pump, also known as mechanical booster pump. Its working principle is to use two 8-shaped rotors to do synchronous rotation in the pump shell, so as to complete the process of suction and exhaust. It has the following characteristics: no internal compression, low compression ratio (0 ~ 10), can not work under high pressure difference, can not work alone, and has high pumping speed.
The application of vacuum system in VD of Baotou Steel shows that it can not only meet the requirements of production process, but also achieve outstanding energy saving effect. The operation of the system is stable, the time to reach deep vacuum is less than 5min, the mass fraction of hydrogen in molten steel is less than 0.00025%, which meets the requirements of many high quality steel production specifications including heavy rail steel. In addition, the maintenance amount of dry vacuum system after operation is very small, only daily spot inspection is needed. And it is maintenance free, greatly reducing the labor intensity of workers.
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