Stationary pollution source waste gas circulating fluidized bed type mercury sampling bottle

Abstract

The invention relates to the technical field of environmental monitoring, in particular to a stationary pollution source waste gas circulating fluidized bed type mercury sampling bottle. The bottle is characterized by comprising a gas outlet pipe with a plug, a gas inlet pipe with a plug and a circulating fluidized bed type mercury sampling bottle body, the circulating fluidized bed type mercury sampling bottle body comprises a cyclone conical cylinder, a circulating fluidized bed cylinder body and a spherical condensation descending return pipe, and ice water at the temperature of 0-4 DEG C continuously flows on an outer sleeve of the spherical condensation descending return pipe; the gas leading-in pipe with the plug is directly inserted into the bottom of the circulating fluidized bed cylinder body, the perforated plate is welded at the bottom end of the gas leading-in pipe with the plug, and the opening area of the perforated plate is equivalent to the section area of the plugged gas leading-in pipe so that gas flow impacts the perforated plate and then is sprayed out in the form of uniform fine bubbles.

Description

technical field [0001] The invention relates to the technical field of environmental monitoring, in particular to a circulating fluidized bed mercury sampling bottle for waste gas from a fixed pollution source. Background technique [0002] Coal combustion is one of the largest emission sources of atmospheric mercury in my country. During coal combustion, mercury in coal is discharged to the atmosphere along with flue gas, and mainly exists in three forms: gaseous elemental mercury (Hg 0 ), gaseous divalent mercury (Hg 2+ ) and particulate mercury. Existing absorption bottles for mercury sampling of waste gas from fixed pollution sources are large-scale bubble absorption tubes, and a certain amount of absorption liquid is installed in the absorption tube of the large-scale bubble absorption tube. It is mainly used to absorb the gaseous or vaporous substances contained in the exhaust gas. The exhaust gas can quickly diffuse into the absorption liquid to realize gas-liquid m...

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Problems solved by technology

[0003] Prior art 1 uses a diatomite-based composite adsorbent to replace the absorption liquid in the current standard method. Compared with the mercury chemical reaction absorption method in the solution of the current standard method, the physical adsorption of the adsorbent and the efficiency of mercury and mercury and its compounds are higher. The reason is that gaseous mercury and particulate mercury are collected and measured through the ion reaction with acidic potassium permanganate and the redox reaction is carried out in the solution. It will cause an increase in the pressure drop along the way. If you encounter a monitoring site with a large dust content, the smoke and dust will often block the micropores of the adsorbent, and the sampling air pump will not work.

Prior art 2 adds a cyclone separator, a fine particle filter, and an activated carbon adsorption tube to capture particulate mercury in an attempt to remove particulate matter first, so as to avoid the problem that the smoke and dust block the micropores of the adsorbent and cause the sampling air pump to fail to work, but there is a problem similar to prior art 1 The same problem as above, that is, the adsorbent is less efficient for physical adsorption and chelation of mercury and its compounds compared to the current standard method of chemical reaction absorption of mercury in solution

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