Enhanced system and method for adsorption removal of mercury in coal-fired flue gas

A coal-fired flue gas removal technology, applied in lighting and heating equipment, etc., can solve the problems of increasing the amount of adsorbents and the cost of mercury removal, limiting the efficacy of active agents and adsorbents, and avoiding re-release and secondary pollution. , Stabilize mercury removal effect and reduce mercury content

Inactive Publication Date: 2014-04-16
XIAN TPRI BOILER ENVIRONMENTAL PROTECTION ENG CO LTD +1
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Problems solved by technology

However, the conversion of the active agent to mercury requires a certain optimal temperature window, which is often inconsistent with the optimal adsorption temperatur

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  • Enhanced system and method for adsorption removal of mercury in coal-fired flue gas

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Embodiment Construction

[0021] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0022] As shown in the drawings, the present invention is a system for enhanced adsorption and removal of mercury in coal-fired flue gas, which includes a coal feeding system 1, a boiler body 2, a denitrification device 3, an air preheater 4, a dust removal device 5, Desulfurization device 6 and chimney 7, additive addition system 8 installed on coal feeding system 1, boiler body 2, denitrification device 3 or air preheater 4, and adsorbent installed between air preheater 4 and dust removal device 5 Injection system9.

[0023] The above-mentioned system strengthens the method of adsorption and removal of mercury in coal-fired flue gas. First, combined with the actual situation of the power plant, it includes the coal type, the coal feeding system 1, the boiler body 2, the denitrification device 3, the air preheater 4, and the structur...

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Abstract

The invention discloses an enhanced system and method for adsorption removal of mercury in coal-fired flue gas. The system comprises an additive feeding system and an adsorbent ejection system, wherein the additive feeding system is disposed on a coal feeding system, a boiler body, a denitration device or an air preheater, and the adsorbent ejection system is disposed between the air preheater and a dedusting device. The method includes: additives are added into the coal feeding system, the boiler body, the denitration device or the air preheater through the additive feeding system, and the additives are in complex physical and chemical reactions with zero-valence mercury in a boiler chamber or high-temperature flue system to convert the zero-valence mercury into bivalent mercury which is easier to be adsorbed by adsorbent; the adsorbent is ejected into a medium-and low-temperature flue gas system between the air preheater and the dedusting device to adsorb mercury and compounds thereof to generate mercury particles; finally, mercury is captured by the dedusting device along with the adsorbent and fly ash when flue gas passes through the dedusting device, thereby removal of mercury in coal-fired flue gas is realized.

Description

technical field [0001] The invention belongs to the technical field of coal-burning flue gas pollutant emission control, and in particular relates to a system and method for strengthening adsorption and removing mercury in coal-burning flue gas. Background technique [0002] Mercury is a highly toxic trace element with volatility and accumulation. Mercury emitted from coal combustion diffuses in the air and settles into water and soil, causing harm to the environment and human health. [0003] The United States has legislated controls on mercury emissions from coal-fired power plants, and similar emissions controls are being implemented in Europe, Japan, Canada, and other countries. As a large coal-burning country, my country has promulgated and implemented the new "Emission Standard of Air Pollutants for Thermal Power Plants" (Gb13223-2011), which restricts the emission of mercury from coal-fired power plants. The Minamata Convention, an international convention aimed at ...

Claims

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Application Information

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IPC IPC(8): F23J15/02F23J7/00
Inventor 蔡铭谭增强李阳聂剑平白少林
Owner XIAN TPRI BOILER ENVIRONMENTAL PROTECTION ENG CO LTD
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