Ethylene cold box
The plate-fin heat exchanger group. A 800,000-ton/year ethylene cracker requires about 20 plate-fin heat exchangers. Hangzhou Oxygen Machinery Factory introduced the design technology and key processing equipment of the American SW Company, which brought the design level and manufacturing capacity of cold box approaching and reached the international advanced level. At present, it has designed and manufactured more than 10 sets of ethylene cold boxes. Therefore, domestic production of 800,000 to 1 million tons of large-scale ethylene cold boxes already has the basic conditions, the next step is to develop a design pressure of 8MPa ethylene cold box.
Polymerization reactor
At present, the design of the domestic tower gas phase reactor is still difficult, but the 250,000-ton polyethylene gas phase reactor designed and manufactured by foreign countries has been used in the 700,000-ton/year ethylene transformation project in Shanghai and Yangtze. Low-density polyethylene ultra-high pressure tubular reactor, design pressure up to 345MPa, design temperature 315°C, ultra-high pressure tube cold bending during the manufacturing process, outer casing continuous thermal set, cold bending stress elimination heat treatment, fatigue self-reinforcement, pipe end cutting Processing is a technical difficulty, its design is currently not fully grasped at home, but the equipment manufacturing experience, the domestic 200,000 tons / year ultra-high pressure polyethylene pipe reactor has been used in Yanshan 700,000 tons / year ethylene transformation. Polypropylene plant loop reactor has been completely designed and manufactured in China. The disadvantage is that large-diameter pipes cannot be produced domestically, and further research is needed on the wall thickness tolerance and elliptical accuracy of steel pipes.
Extrusion granulation unit
Large extrusion granulation units require a production capacity of over 50 tons/hour, equivalent to 300,000 to 400,000 tons/year. The unit itself is very difficult to design and manufacture. At present, only the German WP company, the Japanese steel company, the Japanese Kobe Steel Company, and the American Farrell company have the design, manufacture, installation and debugging technologies. In China, several 70,000-ton extrusion granulators were manufactured through cooperation with foreign countries. However, they have no performance. It is expected that they will continue to be introduced during the “Eleventh Five-Year Plan†period. The import price is very expensive and the unit price is about 5 million to 700. Tens of thousands of dollars should be started as soon as possible, the introduction of technology or co-production.
Distributed Control System (DCS)
The DCS system of petrochemical enterprises' production facilities is currently mainly imported from abroad. Among them, Yokogawa's company and Honeywell's products in the United States account for 1/3 each, and the others are products of Foxboro, ABB, and Bailey of the United States. Domestic research has also been carried out and applied to petrochemical plants with few control loops, but no further research and industrialization has been conducted.
Needed policy support
The design and manufacture of large-scale ethylene complete sets of equipment with a capacity of one million tons is unprecedented, and there are many gaps compared with foreign countries. If we do not seize the favorable opportunity for the rapid development of the domestic ethylene industry to organize research, China's ethylene Major equipment will be subject to long-term control.
Summing up more than 20 years of experience can be seen that to achieve localization of large-scale ethylene equipment of one million tons, it is still necessary to adopt independent innovation or digestion and absorption of imported technology and innovation. In terms of specific measures, the first is the need for state support, the need to clarify the localization of relying on the project, the provisions of localization of equipment, tendering to determine the major equipment development units, the research and development units of technological transformation, funding, taxation preferential policies. The second is to organize scientific research, design, manufacture, and use units to jointly tackle key issues and reward organizations and individuals that have made significant contributions. Third, the use of units to do enlightened users to support the localization of major equipment. In order to reduce risks, the state must give preferential policies to the users of the units in taxation, risk compensation, etc. The fourth is to standardize petrochemical equipment technology policies and reduce resistance to independent innovation.
The plate-fin heat exchanger group. A 800,000-ton/year ethylene cracker requires about 20 plate-fin heat exchangers. Hangzhou Oxygen Machinery Factory introduced the design technology and key processing equipment of the American SW Company, which brought the design level and manufacturing capacity of cold box approaching and reached the international advanced level. At present, it has designed and manufactured more than 10 sets of ethylene cold boxes. Therefore, domestic production of 800,000 to 1 million tons of large-scale ethylene cold boxes already has the basic conditions, the next step is to develop a design pressure of 8MPa ethylene cold box.
Polymerization reactor
At present, the design of the domestic tower gas phase reactor is still difficult, but the 250,000-ton polyethylene gas phase reactor designed and manufactured by foreign countries has been used in the 700,000-ton/year ethylene transformation project in Shanghai and Yangtze. Low-density polyethylene ultra-high pressure tubular reactor, design pressure up to 345MPa, design temperature 315°C, ultra-high pressure tube cold bending during the manufacturing process, outer casing continuous thermal set, cold bending stress elimination heat treatment, fatigue self-reinforcement, pipe end cutting Processing is a technical difficulty, its design is currently not fully grasped at home, but the equipment manufacturing experience, the domestic 200,000 tons / year ultra-high pressure polyethylene pipe reactor has been used in Yanshan 700,000 tons / year ethylene transformation. Polypropylene plant loop reactor has been completely designed and manufactured in China. The disadvantage is that large-diameter pipes cannot be produced domestically, and further research is needed on the wall thickness tolerance and elliptical accuracy of steel pipes.
Extrusion granulation unit
Large extrusion granulation units require a production capacity of over 50 tons/hour, equivalent to 300,000 to 400,000 tons/year. The unit itself is very difficult to design and manufacture. At present, only the German WP company, the Japanese steel company, the Japanese Kobe Steel Company, and the American Farrell company have the design, manufacture, installation and debugging technologies. In China, several 70,000-ton extrusion granulators were manufactured through cooperation with foreign countries. However, they have no performance. It is expected that they will continue to be introduced during the “Eleventh Five-Year Plan†period. The import price is very expensive and the unit price is about 5 million to 700. Tens of thousands of dollars should be started as soon as possible, the introduction of technology or co-production.
Distributed Control System (DCS)
The DCS system of petrochemical enterprises' production facilities is currently mainly imported from abroad. Among them, Yokogawa's company and Honeywell's products in the United States account for 1/3 each, and the others are products of Foxboro, ABB, and Bailey of the United States. Domestic research has also been carried out and applied to petrochemical plants with few control loops, but no further research and industrialization has been conducted.
Needed policy support
The design and manufacture of large-scale ethylene complete sets of equipment with a capacity of one million tons is unprecedented, and there are many gaps compared with foreign countries. If we do not seize the favorable opportunity for the rapid development of the domestic ethylene industry to organize research, China's ethylene Major equipment will be subject to long-term control.
Summing up more than 20 years of experience can be seen that to achieve localization of large-scale ethylene equipment of one million tons, it is still necessary to adopt independent innovation or digestion and absorption of imported technology and innovation. In terms of specific measures, the first is the need for state support, the need to clarify the localization of relying on the project, the provisions of localization of equipment, tendering to determine the major equipment development units, the research and development units of technological transformation, funding, taxation preferential policies. The second is to organize scientific research, design, manufacture, and use units to jointly tackle key issues and reward organizations and individuals that have made significant contributions. Third, the use of units to do enlightened users to support the localization of major equipment. In order to reduce risks, the state must give preferential policies to the users of the units in taxation, risk compensation, etc. The fourth is to standardize petrochemical equipment technology policies and reduce resistance to independent innovation.
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