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Present and future of localization of large and medium air separation filtration equipment
2017-02-10636
The design and manufacture of air separation equipment in China has a history of more than 60 years. It has gone through three stages: imitation, introduction of technology and independent research and development
The first stage is before the reform and opening up in the last century. Under the command of planned economy, it has gone through the following stages: Stone accumulator switching process, aluminum belt accumulator switching process and plate fin heat exchanger switching process. The main product grades are 1000, 3350 and 6000m3 / h air separation equipment. At that time, the equipment has the problems of product output, purity reaching the standard, and energy In the second stage, in the 1980s, China introduced the design and manufacturing technology of large-scale air separation equipment from Linde company of Germany, which made the design and manufacturing level of medium and large-scale air separation equipment in China improve rapidly, and the air separation process advances to the full low-pressure process of molecular sieve adsorption. In this period, the air separation equipment grade is mainly 6000, 10000m3 / h; in the third stage, the equipment grade is mainly 6000, 10000m3 / h After 1990s, the air separation equipment manufacturing industry in China, represented by Hang Yang, has independently developed a new generation of air separation equipment with turbo expander molecular sieve adsorption and structured packing distillation tower technology process based on the digestion and absorption of imported technology. Domestic enterprises have broken through the difficulties of process organization, process calculation, distillation calculation and other air separation equipment design technologies, and mastered the air separation design With all technical essentials of design and manufacturing and independent intellectual property rights, domestic air separation equipment's output, purity, oxygen extraction rate, unit oxygen energy consumption and other technical parameters have reached the world-class level. The maximum specification of domestic air separation products has risen from 10000m3 / h to 15000m3 / h, during which Linde, liquid air and other international famous enterprises are optimistic about China's large air separation equipment market A joint venture or sole proprietorship company will be established in China, and large air separation equipment of 20000m3 / h and above will be launched to the market, and then large air separation filtration equipment of 60000 level and above will be launched.
After decades of precipitation, the domestic large-scale and super large air separation filtration equipment has made great progress in the process of capacity specification increasing, and through the practice of hundreds of large-scale air separation equipment, the design and manufacturing level has also made great progress. Hangzhou oxygen process has mastered the design and manufacturing technology of air separation equipment, such as air separation process organization, process calculation, distillation calculation, fine manufacturing, safety assessment, etc. in the supporting department Under the condition that the machines are basically the same, the domestic designed, manufactured and complete sets of large and super large air separation equipment, such as: product output, purity, variety, pressure, oxygen extraction rate, energy consumption, operation cycle and other technical performance indicators, have reached the international first-class level, and are even with the products of foreign-funded enterprises, so that the complete set price of foreign-funded brand products has also dropped significantly It is on the same level with domestic equipment. However, there is still a gap with the advanced level of foreign countries.
The complete set of domestic air separation equipment and supporting parts can reach the same level of foreign products in the overall technical level, but the reliability of domestic equipment is often not high, the fine management in the design and manufacturing process is not enough, and various small errors continue, so that small problems become big problems, which is also the main factor for users to choose to import under the same conditions. In addition, in consideration of the overall design, structural design and pipeline layout, there are common problems, such as coarse, large and stupid, waste of materials and unsightly appearance
From air filter to compressor, supercharger, heat exchanger, container, pump, valve, all kinds of pipes, plates, adsorbents, instruments and meters need the cooperation and coordination of many units from all walks of life. For the special matching of air separation equipment in special low temperature environment and oxygen medium environment, it is specially designed and manufactured. There is no systematic industrial chain in China, especially in large-scale In the development of super large air separation, many links are lacking, which results in that it can only rely on imports or can not meet the requirements of complete set of performance.
The gas separation and filtration equipment industry has experienced a high-speed development stage and entered the "new normal" development period, with shrinking demand. However, air separation equipment is an integral part of national major equipment, and the development of large industry cannot be separated from air separation equipment. The large-scale, super large-scale and unit clustering of air separation equipment has become a trend. The large-scale air separation equipment can directly reduce the number of air separation equipment in large-scale metallurgical and chemical projects, thus reducing the equipment investment, equipment land and the manual workload of equipment operation and maintenance. The large-scale air separation equipment and unit clustering are conducive to the unified management of equipment, but at the same time, higher requirements are put forward for the optimization of site layout
The refinement of design and manufacturing of air separation equipment is the development trend of large air separation equipment. The technology of air separation equipment has developed to a certain level, and the space for further improvement and development is limited. Therefore, improving the accuracy of design and refinement of manufacturing of large air separation equipment is the key to the development of large air separation equipment. In addition, large and extra large air separation equipment is in large-scale industrialization Because of its importance, large-scale air separation equipment requires more and more refining.
At the same time of localization of large-scale and extra large-scale air separation equipment, it drives the localization of relevant units, supporting parts and components. Through joint research and development with fans, pumps and valves and other industries, it forms the industrial chain of domestic air separation equipment, and further improves the localization rate of large-scale and extra large-scale air separation equipment, including: the localization rate of 60000m3 / h and below complete air separation equipment from the present 50 70% to more than 80%, mainly due to the improvement of efficiency and reliability of supporting air compressor and supercharger, and the realization of real localization; the localization of complete air separation equipment of 60000m3 / h and above
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