Flue gas sampling and mixing device

Abstract

The invention discloses a flue gas sampling and mixing device which comprises a sampling pipe and a flue gas mixer, wherein the sampling pipe comprises a sampling pipe body; one end of the sampling pipe body is an open end and the other end of the sampling pipe body is a sealed end; a plurality of sampling holes are formed in the sampling pipe body at intervals in the axial direction; the pore diameters of the sampling holes are sequentially increased from the open end to the sealed end; the flue gas mixer comprises a plurality of gas mixer chambers separated by porous baffles; one of the gas mixer chambers is provided with a mixing gas outlet; mixing air inlets connected with the open end are formed in the side walls of other gas mixer chambers; the pore diameters of the porous baffles are sequentially decreased in the flue gas flowing direction in the flue gas mixer. The flue gas sampling and mixing device can sample at multiple points and ensures that the sampled flue gas can be mixed uniformly and truly represent the constituent and concentration of the flue gas in a gas duct.

Description

technical field [0001] The invention relates to the field of flue gas sampling and analysis, in particular to a device for flue gas sampling and flue gas mixing. Background technique [0002] At present, high-pollution industries such as thermal power and chemical industry are carrying out air pollution control projects, such as desulfurization and denitrification transformation. In this type of renovation project, it is usually necessary to sample the flue gas in the flue and measure the concentration of pollutants in the flue gas to assess the treatment of pollutants. However, there are many problems in the measurement process. Due to the uneven distribution of the flow field in the flue, it is easy to cause the uneven distribution of pollutant concentration in the flue gas on the section of the measuring hole. Therefore, it is necessary to use the grid method to measure multiple points on the section of the measuring hole, and then calculate the average value. Measure t...

AI Technical Summary

Problems solved by technology

However, the flue gas mixing device in the above system only simply mixes the sampled flue gas, which tends to cause uneven distribution and uneven mixing of the flue gas in the flue gas mixing device, and finally causes the flue gas to enter the gas analyzer from the flue gas mixing device. The flue gas is not representative, and the real pollutant composition and concentration of the flue gas in the flue cannot be accurately determined

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