Dust offline sampling system in closed loop type high-pressure natural gas pipeline and sampling method thereof

Abstract

The invention discloses a dust offline sampling system in a closed loop type high-pressure natural gas pipeline, and the dust offline sampling system comprises a sampling subsystem, a dust collecting subsystem, a metering regulating subsystem and a booster power subsystem which are sequentially connected in series through pipelines, wherein the output end of the booster power subsystem is communicated with one port of a return pipeline; the other port of the return pipeline stretches into a high-pressure natural gas pipeline; the sampling subsystem at least comprises a tubular sampling mouth; the dust collecting subsystem at least comprises a dust collector; a control valve group is arranged on a pipeline which connecting the sampling subsystem and the dust collector; the metering regulating subsystem at least comprises a flow transmitter and a flow regulating valve; and the booster power subsystem at least comprises a booster pump so that natural gas samples return to the natural gas pipeline through the return pipeline. By the adoption of the dust offline sampling system, the zero discharge during the process of dust sampling detection in the natural gas pipeline can be realized, and safe and reliable dusting sampling detection process can be ensured; therefore, the dust offline sampling system has the advantage of reducing the environmental pollution.

Description

technical field [0001] The invention belongs to the technical field of collection and analysis of solid dust in pipelines, and in particular relates to a closed-loop off-line sampling system for dust in high-pressure natural gas pipelines and a sampling method thereof. It is especially suitable for off-line sampling and analysis of dust in high-pressure natural gas pipelines. Background technique [0002] Nowadays, in the detection and analysis of dust in natural gas, the off-line filter weighing method is usually used. This detection method uses the principle of isokinetic sampling, that is, a part of the gas is taken from the natural gas pipeline by means of different types of sampling nozzles for detection and analysis. During the sampling process, ensure that the sampling speed is equal to the gas flow speed in the pipeline, so that representative particles enter the sampling system, so as to determine the dust concentration and particle size distribution in natural gas....

AI Technical Summary

Problems solved by technology

However, since the internal pressure of natural gas pipelines is generally very high, up to 10MPa, and natural gas is a toxic and flammable gas, the natural gas after sampling is directly discharged into the outside atmosphere, which not only causes waste of natural gas, but also increases the cost of on-site sampling. potential safety hazards and aggravated environmental pollution

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