Since February, China's propylene market demand has continued to increase. Qilu Petrochemical closely follows the market changes, actively adopts measures to optimize raw material structure, flexibly adjust production, and carry out staff training to maintain high load production of ethylene plant. From February to March, the cumulative production of 58,000 tons of propylene, high-value polymer grade propylene accounted for more than 99.56%, and the effect is remarkable.

Propylene is a kind of high value-added chemical raw material, is the basic raw material of the three major synthetic materials. In February, Qilu Petrochemical production technology Department, planning and operation department, Finance department and other departments through comprehensive analysis and judgment, forecast that the demand for propylene will remain at a high level, and then formulate a series of optimization measures, give full play to the advantages of refining and chemical integration, to create favorable conditions for increasing production and efficiency.

Sufficient quality raw materials is the premise of productive propylene. They control the quality of interfeeders such as naphtha and hydrocracking tail oil from the source. According to the operation of light hydrocarbon furnaces and light hydrocarbon ethane stocks, the capacity is adjusted to ensure the supply of imported raw materials. In the case of high yield of propylene in the tail oil, according to the operating status of 13 ethylene units in the cracking furnace and the actual demand of downstream ethylene, continue to do a good job of raw material optimization and balance, and real-time switching adjustment according to product benefits and market demand.

Olefin plants that undertake production tasks increase production optimization efforts, continue to optimize cracking depth, and appropriately reduce cracking depth of hydrogenated tail oil and naphtha; Increase the total input of raw materials in the device, and increase propylene production while ensuring the stability of ethylene production. When the yield of propylene in the tail oil is higher than that of naphtha, the input of the tail oil should be increased in time. At the same time, the separation system should be carefully operated to carry out predictive maintenance on the reactor control system, optimize the operation of the carbon III reactor, control the temperature of the sensitive plate of the propylene tower, and reduce the loss of propylene.

Model Worker Innovation Studio participated in solving the problem. In view of the fact that the cracking raw materials are complex and the cracking performance is different, Gaohui model Labor Innovation Studio repeatedly calculates the marginal benefit, finds out the most reasonable cracking depth, and comes up with a creative effect program. Together with the staff, we fine-adjust the parameters of the compression system according to the operation mode of different raw materials in the cracking furnace, so as to realize the staged cracking of naphtha of different quality and give full play to the best performance of cracking raw materials.

Ethylene unit core unit 501 propylene compressor running smoothly is one of the keys to increase production efficiency, but at the end of the operation cycle of the compressor shaft displacement has an increasing trend. To this end, the olefin plant set up a special care group to focus on monitoring 501 propylene compressor. The functional departments of production technology and other functions cooperate with the cracking workshop to adjust the temperature and oil injection of the cracking furnace in time for the changes of upstream raw materials. The first-line team starts from the control of oil temperature and other aspects to carry out small index labor competition to ensure the stable operation of the unit under the condition of high load. At the same time, the factory also adopts the training mode of online expansion + offline concentration, and carries out the training flexibly according to the employees' spare time.