Development of water ring vacuum pump

Development of water ring vacuum pump

As we all know, water ring vacuum pump and water ring compressor are widely used in all walks of life because of their simple structure and convenient maintenance. Especially with the characteristics of isothermal compression, it is easy to pump and compress flammable and explosive gases.

In recent years, many large-scale capital construction and technological transformation projects have been launched in China. The real children of these projects need a lot of PVC materials. Especially the prosperity of real estate has promoted the development of PVC industry. According to the statistics of chlor alkali industry, China produced 4.1 million tons of PVC last year and imported 200 tons. According to the forecast of the industry, the national demand will reach 8 million tons in 2005, and 15 million tons in 2010. It is precisely because of the rapid increase in demand that the enterprises in the chlor alkali industry in China will be transformed and expanded, and many new enterprises have been established in the past one or two years. For the development of chlor alkali enterprises, water ring air pump and water ring compressor must be equipped. The largest water ring vacuum pump and water ring compressor used to pump and compress acetylene and hydrogen were only 30m3 / min in the past. However, the enterprises with an annual output of 100000 tons of caustic soda and 100000 tons of PVC now need more than 70m3 / min of water ring vacuum pump and water ring compressor.

For a long time, when the suction pressure is 1 atm or slightly lower than the upper pressure, the discharge pressure is 0.1MPa, that is, the compression ratio is 2. Some enterprises have produced water ring compressors with discharge pressure up to 25mpag, and only 1-2 specifications. In order to adapt to the production of polyvinyl chloride, 91 former State Council major equipment office put forward the research and development of vinyl chloride recovery water ring compressor in the "Eighth Five Year Plan" major technical equipment research and development of 4 tons of low polymerization degree PVC equipment. This kind of water ring compressor for recovery of vinyl chloride monomer requires that the discharge pressure be under normal pressure or micro negative pressure The force should reach 0.55-0.6mpag and the displacement should reach 700m3 / min.

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