Large-Scale Adsorbent Modification Coupled Injection System for Controlling the Emission of Heavy Metal Pollutants in Flue Gas

Abstract

The invention discloses a large-scale modified coupling injection system for adsorbents, which belongs to the technical field of flue gas heavy metal pollutant control. The system mainly includes: storage tank, feeder, feeding device, modified agent tank, modified host, cyclone separator, collecting hopper, feeder, gas-solid mixing accelerator, injection pipeline and air compressor, etc. During work, the adsorbent and medicament are added to the modified host according to a certain proportion, react and undergo chemical modification; the modified adsorbent is controlled by the feeder and enters the gas-solid mixing accelerator; in the gas-solid mixing accelerator, the adsorbent and gas Mix according to a certain ratio, and then spray it into the flue along the conveying pipeline to absorb and remove pollutants in the flue gas. The system is suitable for the removal of heavy metals (mercury, arsenic, lead, cadmium, chromium, etc.) and acid gases such as sulfur trioxide and hydrogen chloride in flue gas. The invention can realize large-scale on-site modification of the adsorbent, and has the characteristics of continuity and sealing.

Description

technical field [0001] The patent of the invention belongs to the technical field of emission control of heavy metal pollutants in flue gas, and in particular relates to a large-scale adsorbent modified coupling injection system for controlling the emission of heavy metal pollutants in flue gas. Specifically, it refers to the coupled pneumatic conveying and injection system that realizes large-scale modification of adsorbents in coal-fired power plants and other sites, and removes various pollutants in flue gas through adsorption, such as heavy metals (mercury, arsenic, lead, cadmium, chromium) And strong acid gases (sulfur trioxide and hydrogen chloride), etc. Background technique [0002] Heavy metals are enriched and difficult to degrade in the environment. The heavy metals and their compounds discharged to the outside world are very harmful to human health and the ecological environment. Taking the heavy metal mercury as an example, mercury pollutants have the character...

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Problems solved by technology

[0006] At present, the adsorbents used in the adsorbent injection mercury removal technology are all produced in an off-line production mode, with a low degree of automation, and the moisture content of the modified adsorbent is higher than that of the original adsorbent. If the accumulation time is too long, it will easily cause agglomeration, which is difficult. Meet the needs of coal-fired power plants and other on-site continuous operation to remove heavy metal pollutants such as mercury

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