Lanzhou Petrochemical Co., Ltd. - Retrofitting of Low Temperature and High Pressure Methane Pump Seal

Recently, Lanzhou Petrochemical Company petrochemical plant for olefins plant "high-pressure methane in the high ethylene content" production problems of the implementation of technical research success. The ethylene loss caused by the high ethylene content in the high-pressure methane has dropped significantly, and the production of ethylene can be increased by more than 168 tons per month. The annual economic profit will be 7 million yuan. Petrochemical plant olefin plant was put into operation in 1996 ethylene production plant, in June 2003 through the expansion of capacity expansion, ethylene production scale from 160,000 tons per year to the current 240,000 tons. For a long time, ethylene content in high-pressure methane averaged over 2% when the plant was under high-load production conditions, much higher than the design value of 0.3%, and it was not easy to control stably. High ethylene content in high-pressure methane, not only caused the loss of ethylene products, and ethylene under high pressure methane easily clogging equipment, thus affecting the stability of production and reduce the service life of equipment. Earlier this year, the research team composed of factory and workshop technicians was established. Through searching information, exploring practice, researching and exploring, many causes of high ethylene content in high-pressure methane were found from the aspects of personnel, equipment, raw materials and technology Based on the research team to identify the low temperature and high pressure methane pump seal leakage, methane refrigeration compressor pumping capacity is low, ethylene compressor suction temperature is low for three main reasons. In early June, the team succeeded in retrofitting the seal of the low-temperature and high-pressure methane pump with the assistance of the factory and the workshop. The pump, which frequently leaked and sealed the machine, was continuously operated for 94 days continuously. In mid-June, during the advantageous period of utilizing the overhaul of the equipment , The first paragraph of the refrigeration compressor compressor, the second paragraph of the valve replacement, the compressor cheer low from the previous 2890NM2 per hour increased to 3420 NM2 or more; since July, by optimizing the operation of the process, an ethylene compressor inlet The temperature drops below -96 ° C. After the implementation of the research project, the operation of the plant over 4 months showed that the effectiveness of the research was very significant: the ethylene loss in high-pressure methane dropped from an average of 2.22% before the tackling to 0.1%, lower than the designed value. According to the cost of 4200 yuan per tonne of ethylene, monthly output value of 705000 yuan. At the same time, improve the service life of equipment. It is understood that the petrochemical plant has been the formation of written research experience, as an effective means of dealing with similar issues in the future to promote.

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