Automatic control system and control method of low-temperature ethylene vaporizer

Abstract

The invention relates to an automatic control system and control method of a low-temperature ethylene vaporizer. The control system comprises temperature transmitters for medium temperature measurement, pressure transmitters for medium pressure measurement, a control system for vaporizer automatic control, an emergency shutdown system for safe shutdown interlocking under emergency conditions, and regulating valves used for ethylene vaporization temperature and pressure regulation and vapor temperature and pressure regulation; the temperature transmitters are mounted on a pipeline to measure ethylene temperature and vapor temperature in the pipeline, and heat transfer medium temperature in the vaporizer; and the pressure transmitters are installed on the pipeline to measure ethylene pressure and vapor pressure in the pipeline and heat transfer medium pressure in the vaporizer. The automatic control system and control method have the advantages of reasonable composition and rapid and reliable regulation, and can reduce the work difficulty and strength of operators and improve the stability of the operation of equipment.

Description

technical field [0001] The invention relates to an automatic control system and control method of a low-temperature ethylene vaporizer, which is mainly used for ethylene gasification and external transportation of a large-scale low-temperature ethylene storage tank system, and belongs to the technical field of large-scale low-temperature ethylene storage tanks. Background technique [0002] At present, with the increasing domestic demand for chemical raw materials, there are more and more large-scale low-temperature ethylene storage tanks along the coast or along the river, and many low-temperature ethylene storage tanks have gasification pipelines; all gasification pipelines must be equipped There is an ethylene vaporizer, and the control of the ethylene vaporizer is more complicated because there are multiple parameters that need to be adjusted at the same time. In the past, manual intervention by the operator was required. However, manual operation of several control value...

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Problems solved by technology

[0002] At present, with the increasing domestic demand for chemical raw materials, there are more and more large-scale low-temperature ethylene storage tanks along the coast or along the river, and many low-temperature ethylene storage tanks have gasification pipelines; all gasification pipelines must be equipped There is an ethylene vaporizer, and the control of the ethylene vaporizer is more complicated because there are multiple parameters that need to be adjusted at the same time. In the past, manual intervention by the operator was required. However, manual operation of several control values ​​requires the operator to have a high level of operation, otherwise it will be very difficult. It is easy to make the operation of the vaporizer unstable, interlock protection, and cause the interruption of gasification and external transmission

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