Efficient demercurating adsorbent spraying device

Abstract

The invention belongs to the related technical field of mercury control in coal-fired flue gas and discloses an efficient demercurating adsorbent spraying device which comprises a primary spray barrel and a cyclone, wherein an accommodating cavity is formed in the primary spray barrel, and two rows of nozzles which are arranged along two length directions of the primary spray barrel are formed in one end of a flue of the accommodating cavity, separately; the cyclone is accommodated in the accommodating cavity and is located out of the flue; air entering the accommodating cavity from one end, far from the flue, of the primary spray barrel separately forms straight flow air and spiral air through the cyclone, and the straight flow air and spiral air are used for driving an adsorbent entering the accommodating cavity to move spirally downward and the adsorbent is sprayed out from the nozzles to be mixed with flue gas for demercuration. The adsorbent spraying direction is not a single flue gas flowing direction, so that disturbance of the adsorbent is enhanced, the turbulence intensity is enhanced, the demercurating efficiency is increased, and the device is simple in structure and quiet during working.

Description

technical field [0001] The invention belongs to the related technical field of mercury control in coal-fired flue gas, and more specifically relates to an adsorbent injection device for efficient mercury removal. Background technique [0002] Mercury is a kind of nerve poison, which is highly cumulative and irreversible, and poses a great threat to human health. Coal-fired power plants are one of the most important sources of anthropogenic mercury pollution. With the continuous improvement of environmental protection requirements, it is of great significance to seek efficient, economical and environmentally friendly mercury control technologies. [0003] In the prior art, mercury removal devices are usually used to remove mercury in flue gas by using high-efficiency adsorption materials. The current main research focuses on two aspects: mercury removal adsorption materials and mercury removal devices. The research on mercury removal adsorption materials mainly focuses on c...

AI Technical Summary

Problems solved by technology

In laboratory fixed bed mercury removal experiments, most of the mercury removal adsorption materials have high adsorption efficiency, but in the actual flue, comparing the mercury concentration in the flue gas before and after spraying, it is found that the mercury concentration in the flue gas has not decreased significantly

For the existing sorbent injection device, one sorbent injection device has only one nozzle. Through the CFD injection simulation, it is found that the flow trajectory of the sorbent in the flue is very narrow, and it cannot diffuse to the entire flue section and fully mix with the flue gas. During the production process, large-scale arrangement of injection devices will increase construction costs and maintenance costs

In addition, some adsorbent injection devices cannot effectively control the air intake and feed volume, resulting in a large amount of waste of adsorbent and increasing the cost of mercury removal

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