Combustion and explosion safety control system and control method for polyolefin dust bin

Abstract

The invention provides a combustion and explosion safety control system and a control method for a polyolefin dust bin, and belongs to the technical field of petrochemical safety. The combustion and explosion safety control system for the polyolefin dust bin comprises a concentration monitoring device, used for monitoring combustible gas concentration and combustible dust concentration in the bin;a gas purging device, used for performing purging the gas in the bin; and a control device, used for giving an alarm and controlling the gas purging device to perform purging when it is determined that the combustible gas concentration and the combustible dust concentration in the monitored bin are greater than a certain preset threshold value. According to the technical scheme disclosed by the invention, the combustible gas concentration and the combustible dust concentration in the dust bin are monitored in real time; when the combustible gas concentration and the combustible dust concentration exceed the threshold value, gas purging and inerting are performed on the dust bin through the gas purging device; and the occurrence of dust explosion can be effectively inhibited.

Description

technical field [0001] The invention relates to the field of petrochemical safety, in particular to a safety control system and control method for polyolefin dust bunker explosion safety. Background technique [0002] With the increase in the number and scale of polyolefin production units, flash explosion accidents in silos during powder production, storage and transportation occur frequently. During the storage or transportation of dusty materials, combustible dust and combustible gases usually form a mixed system. For example, during the polymerization and granulation of polyolefin materials, there will be a small amount of volatile components of combustible gases (such as ethylene, propylene, etc.). As the powder is sent to the silo by the wind, the combustible gas components adsorbed on the surface of the solid particles will continue to escape in the silo, making the combustible gas and polyolefin dust form a mixed system. In addition, abnormal conditions such as poor...

AI Technical Summary

Problems solved by technology

The dust silo generally adopts the blowback system to remove the combustible gas entrained in the dust, but the ventilation mode, air volume and operation mode of the existing polyolefin silo in China are based on the normal working conditions of the production process such as reaction and gas recovery unit. If there is a temporary failure or damage of equipment or instruments, poor upstream response, processing of unqualified or transitional materials, failure of the material cutting valve in the silo, and other abnormal working conditions, there will be a high risk of explosion

In addition, although the discharge of powder can be effectively suppressed by installing static electricity monitoring and elimination equipment in the silo, the electricity elimination efficiency of the static eliminator is generally 80-90%, which cannot completely eliminate static electricity, and cannot avoid open flames, electric heating, and radiation shock waves. , arc, high temperature and other ignition sources

[0004] To sum up, in view of the explosion risk existing in polyolefin dust silos, existing safety control measures cannot completely avoid explosion accidents

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