China Petroleum Network News (Reporter Feng Zuowen, Correspondent Gao Yixing, Fu Xiaodong) Lanzhou Petrochemical adheres to green and low-carbon development, relies on production process optimization, strives to reduce production consumption, and has achieved good results. Especially after the first major overhaul of the unit this year, in September, the ethylene energy consumption of the 800,000 tons/year ethane-to-ethylene unit dropped to 360.45 kg of standard oil, a year-on-year decrease of 13.63%. Lanzhou Petrochemical has been selected as the "leader" in energy efficiency of ethylene production enterprises using ethane as raw material by the China Petroleum and Chemical Industry Federation for two consecutive years.
The operation status of the cracking furnace has an important impact on the energy consumption of the Yulin ethane to ethylene unit. Lanzhou Petrochemical Yulin Chemical Co., Ltd. fully utilizes the advantages of advanced cracking furnace technology, organizes personnel to operate accurately, keeps the cracking temperature in the optimal range, recycles and utilizes the flue gas waste heat in the cracking furnace as much as possible, further promotes the long-term stable operation of the cracking furnace, ensures the full combustion of fuel gas, improves the thermal efficiency of the cracking furnace and the ethylene yield, and reduces energy and material consumption.
Yulin Chemical Co., Ltd. makes full use of the quenching water of the ethylene unit to preheat the air in the cracking furnace burner, which not only saves fuel gas, but also achieves the purpose of cooling the quenching water, promoting energy conservation and consumption reduction. At the same time, in view of the low temperature and strong wind in Yulin in winter, which is not conducive to chemical production, Yulin Chemical Co., Ltd. carefully maintains the air preheater to ensure smooth operation and ensure that the air temperature entering the furnace meets the standard, reducing the consumption of fuel gas and circulating water, alleviating the negative impact of strong winds on burner combustion, promoting the smooth operation of the cracking furnace, and creating good conditions for reducing energy consumption.
Yulin Chemical Co., Ltd. uses a cascade steam system to implement energy conservation and consumption reduction. The ultra-high-pressure steam produced by the ethylene unit is used for cracking gas compressors, propylene compressors, ethylene compressors and other major equipment. The ultra-high-pressure steam is decomposed into high-pressure, medium-pressure and low-pressure steam during the operation of the equipment and enters the next-level pipeline network to meet the energy needs of other devices. This ensures the rational use of steam energy and reduces the loss of steam venting. Each energy-consuming unit carefully recovers steam condensate, exchanges heat with the desalted water entering the device, and then sends it to the desalted water device for recycling, realizing the repeated use of heat energy. Since the beginning of this year, Yulin Chemical Co., Ltd. has controlled the daily energy consumption fluctuation within 5%.
