A method for automatic control of large valve switching of ethylene cracking furnace

Abstract

The invention discloses an automatic control method for large valve switching of an ethylene cracking furnace, including: initialization and initial permissible work inspection, switching the cracking furnace mode from a hot standby mode to a large valve automatic switching mode, and starting the pressure difference stable state judgment logic , start the closing action of the pyrolysis gas valve until the pressure difference PDZI of the large valve reaches the first set value, stop closing the cracking gas large valve; after the pressure difference of the PDZI large valve reaches the first set value, start to open the coke cleaning gas large valve Action: After opening the coke cleaning gas valve to a certain valve position, start the judgment logic of pressure difference stability state, continue to open the coke cleaning gas valve after the pressure difference is stable, until the PDZI pressure difference is less than the second set value, stop opening the coke cleaning gas valve valve; repeat the operation until the cracking gas valve is completely closed / coke-cleaning gas valve is fully opened. The method has fast adaptive control response and reduces manual operations, which is conducive to improving the stability of the cracking furnace mode switching process and the control accuracy of pressure difference, and reduces the safety risk of the device.

Description

technical field [0001] The invention relates to a method for automatic control of switching of a large valve of an ethylene cracking furnace. Background technique [0002] Ethylene industry is a measure of the development level of a country's petrochemical industry, and has always been regarded as a symbol of petrochemical development. With the continuous development of computer application technology and automatic control technology, the process control system is an important guarantee to ensure the safe and efficient operation of ethylene production units. The ethylene production process implements computer control and optimized operation, and comprehensively applies chemical engineering technology, computer programs and automatic control strategies to give full play to the inherent potential of the plant and equipment, and achieve higher plant economic benefits through energy saving, low cost consumption and high-load production. . [0003] The cracking furnace is the c...

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Problems solved by technology

This process has strict technical requirements for personnel operation and high risk. At present, there is no research and development of relevant control technology; secondly, the stable operation of the cracking furnace requires a large number of operators, who need to pay continuous attention to key parameters, and the operation error tolerance rate is low. ; At the same time, different personnel have different experience in operating key parameters, and the impact on the equipment body caused by the operation is large, which is likely to cause fluctuations in the downstream compression and separation systems caused by the operation of the cracking furnace

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