| The South Distillation Unit of Jinxi Petrochemical Company is dated, and its energy consumption is up to 18-19KgEo/t, which is more higher than the standard level (≤10.8kgEo/t).It is analyzed that the vital reason is the illogical heat exchange network, which leads to lower heated crude temperature (270℃).Then, the utility consumption such as fuel, water, electricity and steam is extremely overloading. In order to decrease the operating cost and increase the economic benefit, the energy conservation revamping must be done including optimizing heat exchange network and updating some equipments.The Pinch technology is a new theory on combined heat exchange network, which is raised by professor B.Linnhoff and so on in 1980's.It has been paid more attention because of its practicability .It has become an advanced and practical energy conservation technology in processing industry. It has been used in almost all processing industry such as petroleum refining, petrochemical industry, paper making, pharmacy and water disposing. Adopting the ASPEN PINCH software based on pinch technology for the first time, we succeed in optimizing heat exchange network of South Distillation Unit.According to the South Distillation Unit, the following methods have been adopted to decrease the consumption of the unit. Optimizing the whole heat exchange network, raising the end heated temperature of the crude, decreasing cooling capacity of products and increasing the yield of heat saving.Optimizing operation parameters, adopting proper reflux ratio in atmospheric vacuum column designing, fully utilizing the energy of high temperature pumparound streams.Revamping the furnace to improve heat efficiency and decreasing the fuel consumption.Revamping the electrical desalter to decreasing the power consumption. Adopting frequency governing technology.The revamping project was finished in August 2002 and the unit ran in good state since September 2002.It was tested that the end heated temperature of the crude is up to 310℃, and the total energy consumption was lower than 10.8kgEo/t.The energy consumption target was achieved.The revamping of the unit again proves that the pinch technology plays a great role in energy conservation design. |
