Smoke constant speed constant current sampling device and method

Abstract

The invention provides a smoke constant speed constant current sampling device. The sampling device comprises a sampling unit, an air supplementing unit and a speed measuring unit; the sampling unit comprises a sampling nozzle, a particulate matter cutter, a filter membrane clamp, a sampling flow rate controller and a sucking pump; the air supplementing unit comprises an air inlet pipe, an air flow rate controller and an air pump; the speed measuring unit comprises a smoke current meter. The invention also provides a method for sampling smoke at constant speed and constant current by utilizing the smoke constant speed constant current sampling device. By adopting the smoke constant speed constant current sampling device and method, the requirements of constant speed sampling and constant current sampling can be simultaneously met, the particulate matters such as PM10 or PM2.5 in the smoke of a fixed pollution source can be collected, the sampling nozzle does not need to be replaced in the sampling process, and automatic continuous sampling can be realized. By supplementing pure air, the concentration of the smoke can be diluted, the sampling device is prevented from being corroded by the smoke, accumulated dust in the sampling nozzle and pipelines can be cleaned by the pure air, and the sampling nozzle and the pipelines can be prevented from being blocked.

Description

technical field [0001] The invention belongs to the technical field of environmental monitoring, and relates to a sampling device, in particular to a flue gas constant-velocity and constant-flow sampling device, and also relates to a flue gas constant-velocity and constant-flow sampling using the above-mentioned flue gas constant-velocity and constant-flow sampling device Methods. Background technique [0002] At present, my country's atmospheric environmental problems are becoming more and more prominent, and regional haze pollution has attracted the attention of the whole society. Haze pollution is mainly caused by the increase of fine particulate matter (PM2.5) in the atmosphere. In order to control the problem of regional haze pollution, my country will implement a new ambient air quality standard (GB 3095-2012) from January 1, 2016, which adds the daily average value and annual average value standard of PM2.5. About 50% of the primary PM2.5 emissions in my country fro...

AI Technical Summary

Problems solved by technology

[0005] The existing domestic sampling instruments cannot meet the requirements of collecting PM 2.5 particulate matter from the flue gas of fixed pollution sources

Existing flue gas samplers can only collect total smoke and dust samples, but cannot separate PM2.5 particles; existing PM2.5 samplers can only perform constant flow sampling, without constant velocity sampling function, and cannot be used for flue gas sampling

Although some foreign sampling instruments can achieve constant-velocity and constant-flow sampling, because the flue gas velocity at the sampling point changes frequently, in order to meet the requirements of constant-velocity sampling, sampling nozzles with different diameters need to be replaced during the sampling process, and continuous automatic sampling cannot be achieved.

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