Fuel gas demercuration, desulfuration and dedusting system and process

Abstract

The embodiment of the invention discloses a fuel gas demercuration, desulfuration and dedusting system and a process. A changeover valve and a bag filter are added to the traditional flue gas contaminant control device, and the changeover valve can be switched based on the oxygen-rich combustion or air combustion condition so as to change a flue gas runner. Under the oxygen-rich combustion condition, deep demercuration can be performed by placing adsorbents, made of the fly ash from the traditional fuel gas contaminant control device, in the bag filter, so as to solve the problems that the deep demercuration cost of activate carbon is high, the load of dust collector load is increased and the quality of fly ash is deteriorated. The method in the embodiment of the invention comprises connecting an electrostatic precipitator, a wet flue gas desulfurizer, a flue gas reheater, the changeover valve, the bag filter, a CO2 collecting unit, a sedimentation tank, a mercury-containing adsorbent collecting unit and an adsorbent preparation subsystem in series.

Description

technical field [0001] The invention relates to the field of emission control of coal-burning flue gas pollutants, in particular to a flue gas demercury, desulfurization and dust removal system and process. Background technique [0002] The concentration range of mercury in coal combustion flue gas is generally 1-20μg / m3. Although this concentration is not high, considering the huge number and scale of coal-fired boilers, coal combustion is still the largest anthropogenic mercury source. After mercury enters the human body, it can cause damage or even failure of the liver and kidneys. In addition, mercury is also a neurotoxin, and its accumulation in brain tissue can cause movement disorders and language disorders in the human body. In order to minimize man-made mercury pollution, the latest "Emission Standard of Air Pollutants for Thermal Power Plants (GB13223-2011)" promulgated by my country requires that starting from January 1, 2015, mercury emissions from coal-fired b...

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Problems solved by technology

[0004] The embodiment of the present invention provides a flue gas demercury, desulfurization and dust removal system and process. A switching valve and a bag filter are added to the traditional flue gas pollutant control device, and the switching valve can be switched according to the oxygen-enriched combustion or air combustion conditions. , change the flue gas flow channel, and under the condition of oxygen-enriched combustion, the adsorbent made from the fly ash of the traditional flue gas pollutant control device can be placed in the bag filter to perform deep mercury removal, which solves the problem of deep mercury removal by activated carbon Problems of high cost, increased dust collector load and reduced quality of fly ash

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