Matrix type automatic cycle sampling device

Abstract

The invention discloses a matrix type automatic cycle sampling device and relates to a sampling device for online monitoring of the content of solid particulates or gaseous pollutants in the exhaust of the electric power, petroleum and chemical industries. The invention aims at providing a matrix type automatic cycle sampling device which has the advantages of accurate and reliable sampled data, high sampling efficiency and convenience in use. The matrix type automatic cycle sampling device comprises an analyzing unit and a sampling unit, wherein the sampling unit comprises a constant-speed cycle sampling device; the constant-speed cycle sampling device comprises a sampling gun; the sampling gun comprises a gun body and a sampling pipe; the orifice of the sampling pipe is positioned inside a flue; the gun body is positioned on the outer side of the glue and is connected with sampling pipelines; the sampling pipelines are communicated with a sampling main pipe; each sampling pipeline is provided with a sampling electromagnetic valve; the sampling pipeline between each group of sampling electromagnetic valves and the sampling gun is connected with a converse blowing pipeline; and the converse blowing pipeline is provided with a converse blowing electromagnetic valve and is connected with a converse blowing air source.

Description

technical field [0001] The invention relates to the technical field of monitoring solid particles or gaseous pollutants, in particular to a sampling device for on-line monitoring the content of solid particles or gaseous pollutants in the exhaust gas of electric power, petroleum and chemical industries. Background technique [0002] At present, the sampling devices of all power plant boiler flue gas solid particles or gaseous pollutants monitoring systems mostly use single-point sampling. The sampling method is designed for use in a uniform or relatively uniform flow field. The concentration of smoke particulate matter or gaseous pollutants. However, due to the technological and space limitations of domestic large-scale power plant boiler flue gas pipelines, the layout of the flue is complex, the space is narrow, and the straight pipe section is short, so it is difficult to achieve the measurement conditions of the straight pipe section with a uniform flow field or a relativ...

AI Technical Summary

Problems solved by technology

However, due to the technological and space limitations of domestic large-scale power plant boiler flue gas pipelines, the layout of the flue is complicated, the space is narrow, and the straight pipe section is short, so it is difficult to achieve the measurement conditions of the straight pipe section with a uniform flow field or a relatively uniform flow field.

Compared with the complex and turbulent actual situation of the large cross-section flue flow field, the single-point sampling method has a great chance of sampling points, and the samples taken by it cannot represent the average concentration of particles or pollutants in the cross-section of the flue, resulting in smoke The measurement data of gaseous solid particles or pollutants has large errors, which can no longer meet the requirements of the relevant standards of the environmental protection department for the online monitoring system of particles or pollutants, nor can it be used as a legal basis for the collection of pollutant discharge fees for pollutant discharge enterprises

The prior art, such as a smoke concentration detection device disclosed in the Chinese utility model patent CN203849138U, includes a plurality of sampling tubes, and the sampling tubes are equidistantly distributed along the inner diameter direction of the flue, so that multi-point sampling can be performed, but the existing problem is that there are many Point sampling is carried out at the same time, so the samples obtained in this way obviously have certain problems in objectivity, accuracy and continuity, and sampling at multiple sampling points at the same time will affect the sampling data of other sampling points due to the turbulence of the airflow

In addition, after the equipment has been sampling for a period of time, the sampling tube is easily blocked by impurities, and manpower and material resources have to be wasted for cleaning

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