Gaseous pollutant multi-point matrix mixed sampling device, sampling method thereof and reverse blowing maintenance method

Abstract

The invention discloses a gaseous pollutant multi-point matrix mixed sampling device, a sampling method thereof and a reverse blowing maintenance method. The device comprises a flue gas duct, a plurality of high-temperature sampling probes are uniformly arranged on the outer side of the pipe wall of the flue gas duct along the same section of a pipe, gaseous pollutants are conveyed into a rear-end mixing box by a 180-DEG C high-temperature heat tracing pipe, mixed and then conveyed into an analysis cabinet. The sampling device solves the problems that single-point flue gas sampling is non-representative, a sampling section of an existing sampling device is blocked by dust, and sampling of a sampling end does not meet standards. According to the whole multi-point matrix mixed sampling device, each probe is individually filtered, two-stage filtration is performed, namely, a front feeler lever is provided with a sintered metal filtering screen, middle high-temperature sampling probes are provided with sintered ceramic filter elements, and dust in flue gas is further prevented from entering the pipe.

Description

technical field [0001] The invention relates to the technical field of monitoring solid particles or gaseous pollutants, in particular to an on-line monitoring device for solid particles or gaseous pollutants used in electric power, petroleum and chemical exhaust. Background technique [0002] At present, the sampling devices of all high-temperature dusty flue gas gaseous pollutant monitoring systems adopt the single-point sampling method. Flue gas, and the composition of the sample gas can represent the concentration of the uniform flow field section. [0003] However, because most of the domestic flue gas pipelines to be tested are complicated in flue layout, narrow in space, and short in straight pipe sections due to technological and space limitations, it is difficult to achieve the measurement conditions of straight pipe sections with uniform flow field or relatively uniform flow field ("Fixed The determination of solid particles in the exhaust of pollution sources and...

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Problems solved by technology

[0007] In view of the above-mentioned problem that single-point flue gas sampling is not representative, multiple sets of high-temperature sampling probes are evenly arranged on the same cross-section to collect flue gas samples from various parts of the flue cross-section, and send them to the back-end mixing through the 180°C high-temperature heating pipeline. Mix in the box, and then send it to the CEMS analysis cabinet to obtain the average concentration of the flue gas mixture in the flue section, which can obtain a reasonable and representative average flue gas concentration in the flue section

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