Due to the development of industries such as coal mines, chemical industry, pharmaceuticals, and papermaking, the requirements for water ring vacuum pumps have increasingly grown toward large-scale development. Before 2000, China was able to produce only 3-4 water ring vacuum pumps with pumping volumes of 100m3/min or more, and the annual output of the country was only a few dozen. Only three years later, in 2003, there were more than 10 manufacturers of large pumps capable of producing more than 100m3/min in the country (of which only 7-8 were in Zibo area). According to incomplete statistics, the country’s largest pump With a production capacity of several hundred units or more, these products are mainly used for:
(1) Coal mine industry As the country has strengthened the safety requirements for coal mines, the use of water ring vacuum pumps, especially large-scale water ring vacuum pumps, to remove gas from gas has become a necessary safety requirement for the coal industry, for example, ordered by a mining bureau in Shaanxi last year. Many super large-scale water ring vacuum pumps with pumping capacity up to 400m3/min are used to remove gas, and some large coal mines use 7~-8 large pumps with pump capacities of 100m3/min or more. As the country further strengthens its safety work, large-scale and super-sized water ring vacuum pumps will be increasingly used in coal mine systems.
In addition, due to the rapid increase in coal production, the vacuum filter used for coal washing and coal dressing has also grown to large scale. In the 1980s, most of them were SZ-4 water ring vacuum pumps with a suction capacity of 27m3/min. It was also larger at the time. In recent years, coal mine filter units have been equipped with large-scale water ring vacuum pumps with an air pumping capacity of 80-150m3/min, and some have reached 200m3/min or more, and there is a tendency for the air volume to continue to increase.
(2) Chlor-alkali industry In recent years, China has initiated many large-scale capital construction and technological transformation projects. The actual children of these projects need a lot of PVC materials, especially the booming of real estate, which further promotes the development of the PVC industry. According to statistics from the chlor-alkali industry, China produced 4.1 million tons of polyvinyl chloride last year and imported 200 tons. According to the forecast of the industry, the national demand in 2005 will reach 8 million tons, and by 2010 it will reach 15 million tons. It is precisely because of the rapid increase in demand that the enterprises in the chlor-alkali industry in China will increase their production capacity and expand production. In one or two years, many new businesses were introduced. The development of chlor-alkali enterprises must be matched with water-salinity pumps and water-ring compressors. The water ring vacuum pumps and water-ring compressors used to extract and compress acetylene and hydrogen have only reached 30m3/min in the past, but now they produce 100,000 tons per year. Companies that use caustic soda and 100,000 tons of polyvinyl chloride need more than 70m3/min of water ring vacuum pumps and water ring compressors.
What needs special introduction here is that it is precisely because of the development of this industry that it has promoted and accelerated the development and production of higher I water and water ring compressors.
For a long time, China's water ring compressors are generally when the suction pressure is 1 atmosphere or slightly lower than the helium pressure, and the pressure is O.1 MPa, that is, the compression ratio is 2, and individual companies have produced water rings with pressures up to 25 MPaG. Compressor, and only 1--2 specifications. In order to adapt to the production of PVC, the former State Council’s major equipment office proposed the recycling of vinyl chloride recycling water ring compressors in the “8th Five-Year†major technological equipment research project—the annual production of 4 tons of low-polymerization PVC equipment. Research and development issues, this water-ring compressor for vinyl chloride monomer recovery requires a discharge pressure of O.55-0.6 MPaG and a displacement of 700 m3/ when the suction pressure is normal or slightly negative. As a result, the water ring compressor has been popularized and applied in the national PVC project in recent years, completely replacing imports.
(3) Fertilizer industry Fertilizer industry, especially the production of phosphate fertilizer is also a key support industry in China's macroeconomic regulation and control. As new projects and old enterprises are technologically upgraded to above-average levels, the large-scale and super-large water ring vacuum pumps It has also been applied here. For example, a newly-established phosphate fertilizer company in Yunnan will add three extra large-scale water ring pumps with a pumping capacity of 300m3/min.
In addition, there are many phosphate fertilizer companies that require greater pumping capacity when the pressure is 80 to 100 hp absolute. Therefore, two-stage water ring vacuum pumps and two-stage water ring vacuum pumps with atmospheric injectors are used here. Under these operating conditions, they have unique advantages. Many chemical fertilizer companies have eliminated reciprocating vacuum pumps with large vibration and noise and high vacuum levels. They have replaced them with two-stage water ring vacuum pumps and received good results. Two levels of water can be said. Ring vacuum pump will be more and more widely used in this industry.
More information in China vacuum pump trading network
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