Sampling system suitable for sampling fine particles in fixed-source droplet-containing flue gas

Abstract

The invention relates to a sampling system suitable for sampling fine particles in fixed-source droplet-containing flue gas. The sampling system comprises a flue gas pretreating part, a flue gas sampling gun, a diluting and aging part, a gas outlet device and a particle collecting part, wherein the flue gas pretreating part comprises a sampling nozzle (1) and a gas-liquid cyclone separator (2); the main body of the flue gas sampling gun (3) is a nafion tube bundle; the sampling nozzle (1) is connected with the front end of the flue gas sampling gun (3) through the gas-liquid cyclone separator (2). The sampling system has the advantages as follows: the dehumidifying effect of a device is improved; the sampling system is compact and miniaturized in structure, and easy and simple to operate.

Description

technical field [0001] The invention belongs to the technical field of environmental monitoring, and relates to a collection device suitable for fine particles in high-humidity flue gas from a fixed source, in particular to a sampling system suitable for fine particles in flue gas containing liquid droplets. Background technique [0002] At present, my country's atmospheric environmental problems are prominent, and regional haze occurs frequently, which has attracted widespread attention. The formation of haze is mainly caused by the increase of fine particulate matter (PM2.5) in the atmosphere, and PM2.5 emitted by fixed pollution sources mainly burning coal is the main source of PM2.5 in the atmosphere. my country's stationary source flue gas treatment mainly adopts the method of dust collector + wet desulfurization. After desulfurization, the flue gas has high droplet content, high humidity, and complex components. The discharged fine particles with high moisture content ...

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Problems solved by technology

[0008] The invention patent with the patent number 201410340512.2, designed the first and second PM2.5 cutters, adopts one-stage dilution, and discharges excess gas by opening a bypass in the dilution and mixing section, realizing the design of the flue gas residence time as 10s And reduce the volume of the residence chamber, it has a good collection effect on the particulate matter in the flue gas with high relative humidity but no liquid droplets, but its applicability to the flue gas containing liquid droplets is still limited and its sampling system is still relatively complicated

[0009] When collecting the flue gas containing liquid droplets, the liquid droplets will gather at the sampling nozzle, which will affect the effect of isokinetic tracking sampling. Heating the sampling nozzle can vaporize part of the liquid droplets, but when the flue gas velocity is large , it is still unavoidable that some droplets enter the sampling system

Once the droplet enters the sampling system, it will have a great impact on the collection of fine particles, and it is difficult to remove the droplet only by dilution

[0010] In addition, due to the difference in the dilution flue gas flow rate in different applications, the volume of the dilution chamber is fixed, and the dilution ratio is uncertain, which will also have a certain impact on the test accuracy.

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