Flue gas mercury sampling gun for thermal power plant

Abstract

A flue gas mercury sampling gun for a thermal power plant comprises a stainless steel sleeve and a stainless steel shell. The stainless steel shell is disposed at the rear end of the stainless steel sleeve and provided with an end cover. A front non-heating exploring tube is detachably connected to the front end of the stainless steel sleeve. A quartz tube which is filed with activated carbon and provided with openings at two ends is disposed in the stainless steel sleeve. A heating layer is disposed between the quartz tube and the stainless steel sleeve. The front end of the quartz tube extends into the front non-heating exploring tube, and the rear end thereof is communicated with a tower mouth disposed on the stainless steel shell. The sampling gun is telescopic, multipoint sampling at low cost is achieved, and on-site operation procedures are reduced. By the heating layer, gasified mercury sedimentation caused by temperature lowering can be prevented, sampling gun inner wall corrosion caused by steam condensation can also be prevented, and sampling accuracy is increased.

Description

technical field [0001] The invention belongs to the field of flue gas mercury sampling, and relates to a mercury sampling device, in particular to a flue gas mercury sampling gun of a thermal power plant. Background technique [0002] Environmental and resource issues are major issues facing mankind today. The massive use of fossil fuels such as coal, oil, and natural gas has not only caused the increasing scarcity of these energy sources, but also caused increasing pollution and ecological environment deterioration. Mercury emitted from coal combustion is one of the main sources of man-made mercury pollution. Mercury is a highly toxic pollutant. When mercury is released into the atmosphere, it will cause serious harm. Under the action of microorganisms, mercury transforms into a kind of methylmercury, which is more toxic than mercury, which can reach the human body through bioaccumulation and accumulation through the food chain. Due to the high affinity of mercury to sulfur...

AI Technical Summary

Problems solved by technology

Among the four methods, OH can give the results of different forms of mercury, which can be used to verify other test methods, but it needs to prepare a large amount of strong acid solution, which has high risk, complicated operation, large overall error and poor repeatability

Compared with the first two wet chemical methods, EPA30B is more convenient and faster, and can quickly obtain results, but this method can only measure the total mercury concentration, and because the current activated carbon adsorption tube is relatively expensive, its morphological method is still at a low level. In the exploration stage, there are still many imperfections

Compared with the first three off-line test methods, EPA30A can continuously provide monitoring results online, with a high degree of automation and no daily operation. However, this method can only be used for single-point monitoring of terminal flue gas, which is relatively expensive and relatively maintenance-free. Difficult, weak resistance to water, dust and sulfur

Images