Dioxin automatic and continuous sampling system

Abstract

The invention discloses a dioxin automatic and continuous sampling system, a blowback unit comprises a sampling pipe blowback pipeline, a P-blowback pipeline and a P + blowback pipeline, the samplingpipe blowback pipeline can be communicated with a blowback air inlet on a sampling pipe, the P-blowback pipeline is communicated with a P-interface of a pitot tube, and the P + blowback pipeline is communicated with a P + interface of the pitot tube; a flue gas inlet, a P-treatment gas inlet and a P + treatment gas inlet are formed in the central processing unit; the air compressor unit is used for providing back-blowing air flow for the back-blowing unit; before sampling, the sampling pipe blowback pipeline performs blowback on the sampling pipe, and the P-blowback pipeline and the P + blowback pipeline perform blowback on the pitot tube at the same time; during sampling, flue gas in the sampling pipe flows into the flue gas inlet through a pipeline, and flue gas in the pitot tube flows into the P-blowback treatment port through the P-blowback pipeline and flows into the P-blowback treatment port through the P + blowback pipeline. The reverse blowing unit is used for respectively performing reverse blowing on the sampling pipe and the pitot tube before sampling, so that the sampling accuracy of flue gas can be improved.

Description

technical field [0001] The invention relates to the technical field of gas sampling, in particular to a dioxin automatic and continuous sampling system. Background technique [0002] Dioxins are short for polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs), with a total of 210 isomers. Dioxins are not only highly toxic, but also carcinogenic, mutagenic, bioaccumulative, and long-term stable in environmental media. They are the most toxic organic compounds known in the world. Dioxins are mainly derived from the combustion of chlorinated organic compounds, among which the discharge of fixed pollution sources such as garbage treatment plants and hazardous waste treatment plants is an important source of dioxins in the environment. [0003] Since dioxins are trace substances, it is very difficult to accurately detect the concentration of dioxins in flue gas. The detection of dioxins is mainly based on off-line analysis by high-resolution gas chr...

AI Technical Summary

Problems solved by technology

The method of manual sampling mainly relies on the sampling personnel to carry portable sampling equipment to the site for sampling. This sampling method not only requires a lot of human resources, but also depends on the technical level of the sampling personnel on the spot, resulting in great variability in the sampling results. Uncertainty

At the same time, in the early stage of sampling, the gas mixed in the sampling tube and the pitot tube will affect the accuracy of the test results. The existing sampler is designed with a backflush gas circuit, but most of them only backflush the pitot tube, and the tube If the circuit is directly connected to the pressure sensor, the damage to the pitot pressure sensor will be greater and the service life will be reduced

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