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System for comprehensively controlling heavy metal pollutants in flue gas of coal-fired power plant

A technology for coal-fired power plants and heavy metals, which is applied in the directions of combination devices, separation methods, lighting and heating equipment, etc., can solve problems such as single effect, and achieve the effect of outstanding effect, reasonable disposal and emission reduction.

Active Publication Date: 2015-04-29
WUHAN UNIV
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Problems solved by technology

At present, many studies focus on the control of mercury, a single heavy metal pollutant, while ignoring the control of As, Pb and other heavy metal pollution with obvious hazards, and most of the methods have single effect

Method used

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  • System for comprehensively controlling heavy metal pollutants in flue gas of coal-fired power plant

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Embodiment Construction

[0025] as attached figure 1 As shown, the coal-fired power plant flue gas heavy metal pollutant comprehensive interception and control system provided by the present invention includes an SCR reaction zone connected with a coal-fired boiler, and the SCR reaction zone is connected to an electric dust collector, a bag filter and a desulfurization reaction zone in sequence, and the desulfurization The slurry in the reaction zone is added with an oxidant or metal complexing agent, and the slurry in the desulfurization reaction zone is added with a flocculant and then connected to the clarification filter and the ultrafiltration unit in turn, and the supernatant from the ultrafiltration unit is adjusted to pH 6. Connected with the reverse osmosis unit, the high-chloride and high-calcium concentrate from the reverse osmosis unit passes through the concentrated water tank, delivery pump, atomizing nozzle and the flue between the SCR reaction zone and the electrostatic precipitator...

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Abstract

The invention relates to a system for comprehensively controlling heavy metal pollutants in flue gas of a coal-fired power plant. The system aims at the characteristics that great flue gas hazards and solid waste heavy metal residues are caused due to complex coal-fired components and high heavy metal content in the power plant in China, a catalytic oxidation technology, a high-chlorine concentrated solution spraying mercury removal technology, an electric-bag dust collection technology, a wet complexation and oxidation technology, an ultrafiltration / reverse osmosis technology, a deep washing solid-liquid separation technology, an evaporative crystallization technology and multiple related technologies are coupled on the basis of the conventional pollutant purification facilities in the coal-fired power plant, and a composite system for performing interception treatment at the front end and performing enrichment and separation recycling at the tail end is constructed, so that the gas-liquid-solid three-phase all-around removal and purification aim of heavy metal pollutants in the flue gas of the coal-fired power plant is achieved. The system is easy to construct, outstanding in effect and high in targeting property and has good environmental benefits.

Description

technical field [0001] The invention includes a comprehensive interception and control system for heavy metal pollutants in flue gas of a coal-fired power plant, and belongs to the technical field of environmental protection. Background technique [0002] Arsenic, mercury, etc. are global pollutants with strong bioaccumulation, carcinogenic and teratogenicity, and have important impacts on human health and the ecological environment. Coal combustion is an important emission source of heavy metal pollution such as arsenic and mercury. Therefore, the control of heavy metal pollution emissions from coal-fired power plants is urgent. Although my country has not made clear restrictions on the discharge of heavy metal pollution in the coal-fired process, with the increasingly prominent environmental problems and the urgent need for people's high-quality living standards, the control of heavy metal pollutants in the flue gas of coal-fired power plants will soon be put on the agend...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/64B01D53/80B01D50/00F23J15/00
Inventor 胡将军李鸿鹄
Owner WUHAN UNIV
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