An integrated method of adsorbent activation and spray mercury removal

Abstract

The invention discloses an integrated adsorbent activation and spraying demercuration method which comprises the following steps: monitoring the mercury concentration of flue gas in real time by virtue of an online mercury concentration monitor (6), and dynamically regulating a second regulating valve (10) to control the injected volume and injection rate of a mercury adsorbent; dynamically regulating a third regulating valve (14) to control the injected volume and injection rate of compressed air; meanwhile, dynamically regulating a first regulating valve (7) on an online activation mechanism to control the injected volume and injection rate of an active component precursor; activating the adsorbent on line; spraying and injecting the activated adsorbent into a flue through a spraying mechanism, thereby implementing demercuration of the flue gas. According to the method, the demercuration performance of the adsorbent is optimized, active component waste is also avoided, the using amount of the adsorbent is reduced, and the demercuration cost is greatly reduced; in addition, the mercury adsorbent is activated on line in real time, and the method is adapted to frequent fluctuation of the mercury concentration.

Description

technical field [0001] The invention belongs to the technical field of mercury control in coal-fired flue gas, and in particular relates to an integrated method of adsorbent activation and spray 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 explore 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...

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Problems solved by technology

[0005] However, this mercury removal method also has certain defects. During the mercury removal process, the adsorbent stays in the flue gas for only a few seconds, and then it is captured by the dust removal device, and its adsorption is far from reaching saturation. The active component of the layer is the main body participating in the reaction, which will lead to an extremely low utilization rate of the active component in the inner layer of the adsorbent

In addition, the load of the power plant, the quality of coal into the furnace, and the combustion conditions are variable, resulting in large fluctuations in the concentration of mercury in the flue gas. However, the content of active components of the adsorbent prepared by chemical solution impregnation is usually fixed, which cannot adapt to the mercury concentration. Frequent fluctuations in concentration lead to a large waste of adsorbents and greatly increase the cost of mercury removal

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