Ethylene industry

In the past decade or so, China's ethylene industry has made rapid progress on the basis of digesting and absorbing imported technology from abroad. China now has 18 sets of large, medium and small ethylene plants. In 2000, it produced nearly 4.7 million tons of ethylene. However, there is still a certain gap between China's ethylene production industry and foreign countries.
The gap between China's ethylene industry and foreign ethylene is mainly reflected in energy consumption and equipment inspection and maintenance. The high energy consumption of ethylene causes the overall cost of the product to be too high. The energy consumption occupies a considerable proportion in the overall cost. The energy consumption of foreign ethylene plants generally accounts for 63% of the total cost, while domestic ethylene accounts for an average of 76%. Long-period operation of ethylene equipment is the most direct expression of the competitiveness of the equipment. The overhaul period of foreign ethylene plants is at least 4 years, some have reached 5 years or more, the overhaul time is only 20 days, and the unplanned shutdown accident rarely occurs in the daily operation. The domestic overhaul period of ethylene is mostly kept at 2 Around the year, it takes a long time to stop and overhaul, and there are also more unplanned parking in peacetime.
In overseas countries, the cost of overhauling is generally controlled at one-third of the total maintenance cost, and two-thirds of the cost is used for routine maintenance; while the domestic overhaul cost for ethylene is high, and the proportion of routine maintenance costs is low. Many inspections must be resolved at the time of major overhauls. Ethylene abroad also places great emphasis on preventive maintenance. Testing and analysis of operating equipment are performed using equipment. Life assessment of the vulnerable parts of the equipment is performed in advance, and domestic ethylene cannot be preventively repaired. The accident equipment is only focused on repairs, and it does not pay attention to analyzing the causes of damage and improving the maintenance methods.
High energy consumption will inevitably affect the competitiveness of the device. For this reason, domestic ethylene must take targeted measures and work hard to reduce energy consumption. First of all, we must strengthen management, place energy consumption management in the same position as pursuing output and safety, improve energy metering, increase online monitoring systems, and strengthen technical analysis of energy consumption to achieve dynamic management of energy consumption; second, do a good job Large ethylene energy consumption - operation and maintenance of cracking furnaces. At present, domestic ethylene cracking furnaces have such problems as low utilization rate, poor standby capacity, long average burn time, long overhaul time, and poor control of the flue gas content. Therefore, it is necessary to continuously optimize the technological operation of the cracking furnace and adopt advanced technologies such as APC. The control technology, to suppress the coke tube, optimize the performance of the burner, and balance the fuel system; again, it is to optimize the utility system, that is, improve the monitoring of circulating water, enhance the steam balance, and eliminate the flare emissions under normal conditions. In addition, in the inspection and maintenance of equipment, it is necessary to learn from abroad, establish a preventive maintenance inspection system for the equipment, and pay attention to the daily maintenance and repair of the equipment to prolong the maintenance cycle of the equipment and reduce the maintenance cost.
In view of the current development of China's ethylene industry, the state should reduce the tariffs on imported crude oil and naphtha to zero. In the long run, the development of China’s ethylene industry must rely on foreign crude oil and petroleum resources. Zero tariff can reduce the domestic petrochemical industry's production costs, improve competitiveness and resistance to risks; continue to strictly combat smuggling and ensure the normalization of the domestic petrochemical market Order; Establish a localization fund to promote the localization of ethylene production technology, engineering design and equipment.
As China enters the WTO, the domestic ethylene industry faces a severe test. The "Tenth Five-Year Plan" of the petrochemical industry puts forward three ideas for China's ethylene transformation: First, highlight quality, variety, efficiency, and substitute import; Second, adopt new technologies to reduce material consumption and energy consumption, and reduce production costs; Third, reduce construction investment. , improve competitiveness.
The five issues that the press industry should focus on solving are based on the development trend of China's plastic products and the need for adjustment of product structure and the actual situation of China's press industry. Related parties suggest that in the coming period, the press industry should focus on addressing the following five issues: Technical issues.
First, the polymer material stretching, compounding, foaming technology equipment, stretching, compounding, foaming is an extremely important technology in plastic molding, involving raw material formulation, molding process, plastic machinery and plastic mold. According to the market demand, biaxially oriented film forming technology and equipment should be focused on to make it practical and commercialized.
Second, the flat extrusion molding process and equipment with "T" type î—¤ or hanger î—¥ î—¥ head as the mark of the molding technology, in recent years, rapid development abroad, and increasingly mature, perfect, its importance and the plastic processing accounted for The component is rising rapidly.
In China, such technologies and equipment are in the initial stage of development, and most of the equipment is blank. This technology focuses on the study of the machine head, cooling, and calendering device manufacturing. On the basis of the development of single-layer sheet production technology and equipment, the coextrusion sheet production technology and equipment have been developed.
Third, the principle of electromagnetic dynamics and application of electromagnetic dynamic extruder for the world's first, in a certain range of certain products have been successfully applied (such as for small and medium-sized blown film production). The extruder saves energy, saves material, and economic and social benefits cannot be matched by other technologies. In addition to the need to solve the corresponding molding equipment, this technology still has to solve the problems of high-speed and high-efficiency heat balance in the theory of electromagnetic dynamic extrusion and improve the plasticizing ability and quality of high-molecular-weight materials.
IV. On-line inspection and automatic control technology In the developed countries of the plastics industry, the digital, intelligent control and proportional or servo system technology of injection molding materials has matured and is rapidly updated; the extrusion molding equipment realizes full-line on-line control and online The detection device establishes a feedback system.
Fifth, the establishment and application of computer computer CAD/CAPP/CAM system has been widely applied in foreign countries. The country also has basic conditions and should actively promote popularization and application.

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