Coal-fired flue gas sampling device

Abstract

The invention provides a coal-fired flue gas sampling device. The coal-fired flue gas sampling device comprises a sampling gun unit, a diluting unit and a sampling unit. The sampling gun unit is used for sampling coal-fired flue gas. Dilution air generated by the diluting unit enters a primary diluting and mixing section of the sampling gun unit to mix and dilute the coal-fired flue gas, and the mixed and diluted coal-fired flue gas enters a secondary diluting and mixing section of the sampling unit. Sampling equipment of the sampling unit is used for sampling coal-fired flue gas from the secondary diluting and mixing section. The device overcomes the defect that a sampling device extracts flue gas out of a flue in a heating mode, water vapor condensation in the flue gas is reduced through high-flow dry air, and the real process that the flue gas enters the atmospheric environment is simulated to the maximum extent. The equipment is easy to operate, low in repair and maintenance cost and suitable for outdoor operation.

Description

Technical field [0001] The present invention relates to detection techniques, and specifically is a coal-fired flue gas sampling device. Background technique [0002] In recent years, atmospheric smog has always been the focus of public attention. With the increasingness of haze governance, the technical requirements for the sampling monitoring of flue gas particulate matter are getting higher and higher. Taking the coal-fired power plant as an example, after the domestic power plant completes ultra-low emission transformation, the flue gas is high in the tail of the flue, and the characteristics of the particulate matter emission concentration are low. In addition, the flue gas also contains a large amount of condensable particulate matter, these particulates in the smoke In the lane environment, it is transformed into a particulate object in the air environment. These features of smoke in ultra-low emissions, coal power plant, emissions of accurate measurement coal-fired power ...

AI Technical Summary

Problems solved by technology

The limitation of this method is that it can only test the filterable particulate matter in the flue gas, and the generation of condensable particulate matter is affected after the flue gas is heated, and the accurate amount of the condensable particulate matter in the flue gas cannot be obtained

In addition, this method has high requirements for the whole process of heat tracing and heat preservation of the sampling system. At present, most of the instruments on the market cannot achieve the whole process of heat tracing. At the same time, due to the high humidity of the flue gas, a liquid film is easily formed in the sampling device, which affects the test. accuracy

In addition, some online instruments currently use Nafion tubes to pretreat flue gas for water removal, but Nafion tubes are expensive, and the effect of its non-metallic lining on the adsorption of particulate matter is not yet clear

In the prior art, the limitations of some of these methods are that during the process of heating the flue gas through the sampling gun, the high-humidity flue gas will still condense and form droplets in the sampling gun, which will affect the final test results

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