Coal-fired flue gas synergistic oxidation and mercury removal device and mercury removal method

Abstract

The invention discloses a collaborative oxidation demercuration device and demercuration method for coal-fired flue gas. The device comprises a solution-preparing tank. An inlet of the solution-preparing tank is connected to a pure water adding device and a calcium bromide solid powder feeding device; an output pipe of the solution-preparing tank is provided with a high voltage variable frequency metering pump; and a tail end of the output pipe is provided with a solution spraying gun The method comprises the steps of 1) adding pure water and calcium bromide solid powder in the solution-preparing tank and preparing a calcium bromide solution with a mass percentage of 10-30%; 2) pumping the calcium bromide solution into the solution spraying gun through the high voltage variable frequency metering pump; and 3) spraying the calcium bromide solution to coal powder through the solution spraying gun, so as to carry out collaborative oxidation demercuration. The collaborative oxidation-demercuration device and demercuration method can effectively control the concentration of zero-valence mercury in the coal-fired flue gas. The demercuration device has the characteristics of simple system, convenience, low operation cost, easy maintenance and management, easy popularization and application. The demercuration device and demercuration method have very high popularization and application values.

Description

technical field [0001] The invention belongs to the technical field of coal-fired flue gas purification, and relates to a frame-type synergistic oxidation and mercury removal device and a mercury removal method of a coal-fired power plant, which can effectively control the concentration of zero-valent mercury in coal-fired flue gas and increase the synergy of the wet desulfurization system. Mercury removal ability. Background technique [0002] Heavy metal mercury pollution in coal-burning flue gas has become another hot spot of social concern. In 2011, the Ministry of Environmental Protection of China promulgated a new version of the "Emission Standards of Air Pollutants for Thermal Power Plants", which stipulates that from 2015, the emission limit of mercury in flue gas of coal-fired power plants shall be 30 μg / m3. In this way, it is very urgent to determine a set of economical and practical mercury removal technology for some coal-fired power plants with excessive mercur...

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Problems solved by technology

However, this method is not easy to control due to the occurrence of reverse reactions, and secondly, it is difficult to realize because it may affect the normal operation of the desulfurization system.

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