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The industrial application of water ring vacuum pump is getting wider and wider, and the development trend is increasing

1. Large chemical industry
Due to the development of coal, chemical, pharmaceutical, paper and other industries, the requirements for water ring vacuum pumps are becoming more and more large-scale. Before 2000, China could produce only 3-4 water ring vacuum pumps with a pumping capacity of more than 100m3/min, and the annual output of the country was only a few dozen. After only three years, by 2003, there were more than 10 manufacturers of large pumps capable of producing more than 100m3/min (including only 7-8 in Zibo area). According to incomplete statistics, the national large pumps With a production capacity of several hundred or more, these products are mainly used in:
(1) Coal mining industry
As the country has strengthened the safety requirements for coal mines, water ring vacuum pumps, especially large water ring vacuum pumps, have become a necessary safety requirement for the coal mining industry. For example, a number of pumping quantities ordered by a mining bureau in Shaanxi last year reached 400m3/ The extra large water ring vacuum pump of min is used to remove gas, and some large coal mines use 7-8 sets of large pumps of 100m3/min or more. As the country further strengthens its safety work, large and extra large water ring vacuum pumps will be more and more widely used in coal mine systems.
In addition, due to the rapid increase in coal production, the vacuum filter used in coal washing and coal preparation has also been developed in large scale. In the 1980s, most of the SZ-4 water ring vacuum pumps with a pumping capacity of 27 m3/min were used. It was also big at the time. In recent years, coal mine filters have been equipped with large-scale water ring vacuum pumps with a pumping capacity of 80-150 m3/min, and some have reached more than 200 m3/min, and there is also a trend that gas volume continues to increase.
(2) Chemical industry
a) Chlor-alkali industry
In recent years, many large-scale capital construction and technological transformation projects have been launched in China. The actual children of these projects need a large amount of PVC materials, especially the prosperity of real estate, which has further promoted the development of the PVC industry. According to the chlor-alkali industry. Statistics show that China produced 4.1 million tons of PVC last year and imported 200 tons. According to the industry's forecast, the national demand in 2005 will reach 8 million tons, and by 2010 will reach 15 million tons. It is precisely because of the rapid increase in demand that China's chlor-alkali industry enterprises will be expanded and expanded. In the first two years, many new companies have been established. The development of chlor-alkali enterprises must be equipped with water-sand pumps and water-ring compressors. The water-ring vacuum pump and water-ring compressor used to extract and compress acetylene and hydrogen have a maximum of 30m3/min, but now have an annual output of 100,000 tons. For companies such as caustic soda and 100,000 tons of PVC, water ring vacuum pumps and water ring compressors are required to reach 70m3/min or more.
What needs to be specially mentioned here is that due to the development of this industry, the development and production of high-I-water ring compressors have been promoted and accelerated.
For a long time, China's water ring compressors generally have a suction pressure of 1 atmosphere or slightly lower than the barium pressure, the exclusion pressure is 0.1 MPa, that is, the compression ratio is 2, and some enterprises have produced a water ring with a pressure of 25 MPaG. Compressor, and only 1--2 specifications. In order to adapt to the production of PVC, 91 the former State Council Major Equipment Office proposed the vinyl chloride recovery water ring compressor in the development of the “Eighth Five-Year” major technical equipment project--the annual production of 4 tons of low-polymerization polyvinyl chloride plant equipment. The research and development project, this water ring compressor for recovering vinyl chloride monomer requires that the discharge pressure should reach O.55-0.6MPaG and the displacement should reach 700m3 when the suction pressure is normal pressure or micro-negative pressure. Min. After several years of hard work, our company passed the technical appraisal organized by the former Ministry of Machinery in December 1996, and the customer technology has reached the tackling requirements. Based on this product, our company has developed a series of products with a displacement of 90m3/min to 2000m. /h. Since this equipment is one of the key equipments in the PVC industry, this kind of water ring compressor has been promoted and applied in the situation of the large-scale PVC project in the country in recent years, completely replacing the import.
b) Fertilizer industry
The chemical fertilizer industry, especially the production of phosphate fertilizer, is also the key industry supported by China's macroeconomic regulation and control. As the new projects and the technological transformation of the old enterprises are both above and above, the large and extra large water ring vacuum pumps have also been obtained here. Application, such as a phosphate fertilizer company in Yunnan, a new large-scale water ring pump with a pumping capacity of 300m3/min.
In addition, there are many phosphate fertilizer enterprises that require a large pumping capacity when the pressure is absolute pressure of 80-100 hPa. Therefore, a two-stage water ring vacuum pump and a two-stage water ring vacuum pump with atmospheric ejector are used here. Under certain working conditions, it has unique advantages. Many fertilizer enterprises have eliminated the reciprocating vacuum pump with large vibration and noise and high vacuum. It has been replaced by a two-stage water ring vacuum pump and has received good results. It can be said that the two-stage water ring Vacuum pumps will be more and more widely used in this industry.
c) Paper industry
At the end of the last century and the beginning of this century, China's national debts accounted for a large proportion of the paper industry. Paper mills across the country rushed to transform the level and scale, which greatly stimulated the development and production of large-scale water ring vacuum pumps. A large-scale water ring vacuum pump (currently the largest specification water ring vacuum pump produced in China) with a pumping capacity of 400IIl3/min was modified at a time, with a total power of 400kW. It can be said that 50% of large-scale water ring vacuum pumps with pumping capacity above 100m3/min in recent years are used in the paper industry, and this trend is increasing.
d) Pharmaceutical industry
Vacuum concentration, dehydration, drying and distillation are the main processes of pharmaceutical companies. The technological transformation of pharmaceutical companies is also on the upper level and on the scale, which is more obvious in some large pharmaceutical companies. In the past, most of the small pumps of 10m3/min or less were used. Now, in the bidding for these enterprises, medium and large pumps with a pumping capacity of 20m3/min or more are already in the majority. In addition, many factories in the pharmaceutical industry used to use two-stage water ring vacuum pumps with a pumping capacity of 6-12 m3/min, and now they are equipped with two-stage water ring vacuum pumps of 20-30 m3/min, and some still reach 60 m3/min. For example, a joint venture pharmaceutical factory in Sichuan last year bid for 10 pumps with a pumping capacity of 60m3/min.
In addition to the above industries, the vacuum systems of the food industry, the beer industry, and the metallurgical, power generation, petrochemical, building materials and other industries have all developed to large scales. For example, an aluminum plant in Shandong has long used multiple water rings with a pumping capacity of 85m3/min. The vacuum pump, and the water ring vacuum pump required for the equipment tendering of the technical transformation project last year, should reach 140m3/min

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