Low-pressure early-warning protection system for mining liquid carbon dioxide pipeline

Abstract

The invention provides a low-pressure early-warning protection system for a mining liquid carbon dioxide pipeline. Through adopting the low-pressure early-warning protection system for the mining liquid carbon dioxide pipeline, when the pressure in the carbon dioxide pipeline is lower than a preset pressure value, an intrinsic safety control box generates a control instruction for closing a low-temperature stop valve, the control instruction for closing the low-temperature stop valve is sent to an automatic opening and closing system, and the automatic opening and closing system controls the low-temperature stop valve to be opened or closed through a mining cable, so that real-time monitoring control over the pressure value in the carbon dioxide pipeline is achieved; and when the pressurevalue is lower than the preset pressure value, the low-temperature stop valve can be effectively used for sealing the pipeline, so that the pressure in the pipeline is kept, and the problem that the carbon dioxide pipeline cannot be used for a long time due to the fact that carbon dioxide in the pipeline is converted from a liquid state into a solid state and forms dry ice when the pressure of thepipeline is lower than 1 Mpa is avoided.

Description

Technical field [0001] The invention relates to the technical field of underground safety, in particular to a low-pressure early warning protection system for mine liquid carbon dioxide pipelines. Background technique [0002] Liquid carbon dioxide equipment is used in coal mines for fire prevention and extinguishing. The equipment transports carbon dioxide in liquid, low temperature, and medium pressure. During use, the pressure of pipeline liquid carbon dioxide continues to drop. When the pipeline pressure is lower than 1Mpa, the pipeline carbon dioxide changes from liquid to solid. Into dry ice. Because the volume of dry ice is larger than the volume of liquid and is solid under the same quality, it takes a long time for dry ice to melt, and the pipeline cannot be used for a long time (half a month or a month). Because the equipment is an emergency equipment for underground fire fighting, it cannot be used for a long time. Cause huge hidden dangers and losses; on the other ha...

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Problems solved by technology

[0003] In order to solve the problem in the prior art that the internal pressure of the pipeline cannot be effectively monitored, which leads to the failure of the normal operation of the pipeline, the embodiment of the present invention provides a low pressure early warning and protection system for mine liquid carbon dioxide pipelines

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