Sampling gun having filter core for mercury in flue gas

Abstract

The invention discloses a sampling gun having a filter core for mercury in flue gas. The sampling gun comprises an active carbon adsorption sampling device, the active carbon adsorption sampling device comprises a sampling pipe, a filter screen protecting pipe and a sampler, the sampling pipe is connected with the filter screen protecting pipe through a screw thread, a porous net piece-reeled cylindrical structure is arranged in the filter screen protecting pipe, a rear end of the filter screen protecting pipe is in a convex shape, a front end of the sampler is in a concave shape, the filter screen protecting pipe and the sampler are mutually clamped, a front half part of the sample is an adsorption pipe, a demountable filter membrane is arranged in the adsorption pipe, and an active carbon adsorbent is filled at upper part of the filter membrane. The sampling gun has the advantages of simple operation, low cost, and small volume; a solution absorption sampling device can reflect concentration of gaseous mercury in the flue gas under high temperature and high sulfur environment; and the active carbon adsorption sampling device can reflect concentration of gaseous mercury and particle mercury in low concentration dust environment and the flue gas.

Description

technical field [0001] The invention relates to the field of analysis and measurement of heavy metals in waste gas from fixed pollution sources, in particular to a flue gas mercury sampling gun with a filter element. Background technique [0002] With the rapid growth of my country's electricity demand, the total coal consumption of thermal power plants has maintained a high-speed growth trend. Tail gas detection and control after coal combustion is an effective measure to reduce the amount of mercury released during the coal combustion process, which requires sampling the tail gas to detect the mercury concentration. According to different concentrations to choose appropriate control measures. [0003] Mercury in flue gas exists in different physical and chemical forms; the concentration is very low, at the microgram level, which requires precise control of the sampling and analysis process to eliminate various interference factors and ensure measurement accuracy. Existin...

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Problems solved by technology

[0004] Aiming at the problems of flue gas mercury sampling devices in the prior art, such as complex operation, high cost, low collection efficiency, harsh environmental requirements, and Louis blockage of sampling pipes, etc., the purpose of the present invention is to provide a flue gas mercury sampling gun with a filter element , effectively improve sampling accuracy and precision

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