Semi-dry method refuse burning fume cleaning treatment method and system thereof

Abstract

The invention provides a semi-dry garbage incineration flue gas purifying treatment method and a system device thereof, flue gas enters a spray tower from a waste heat boiler, activated carbon is injected into a horizontal inlet flue to remove dioxin and heavy metals in the flue gas; the flue gas is simultaneously carried out the reaction with a high specific surface area alkaline neutralizer, most of the harmful substances in the flue gas are purified by generating chemical reactions with the alkaline neutralizer; when the flue gas passes through a filter layer which is formed by granule materials in a bag dust collector, gaseous pollutants can still be reacted with non-reacted lime and activated carbon in the filter layer to be further purified. The system device can lead the flue gas and the high specific surface area lime emulsion to achieve the best contact area, thus ensuring the best flue gas retention time, achieving the full heat transfer and the chemical and heat transfer process; furthermore, the spray is even, the anti-blockage and the anti-corrosion performances are better; a lime emulsion preparation device can automatically control and prepare the concentration and the using amount of the emulsion to be participated in the reaction according the content of wastes in the ingredients of the flue gas and the temperature of the flue gas; the usage and the regulation of the neutralizer are flexible. The system device further has the advantages of low investment cost, strong load adaptability and no waste water discharge, etc.

Description

technical field [0001] The invention relates to a process method for purifying flue gas from municipal solid waste incineration, in particular to a method for purifying flue gas from semi-dry waste incineration and an equipment system thereof. Background technique [0002] With the development of the economy, the amount of municipal solid waste is also increasing. At present, there are three main methods of municipal solid waste disposal: sanitary landfill, high-temperature composting and incineration. Since the two methods of sanitary landfill and high-temperature composting will cause environmental pollution problems, incineration to produce energy is the direction of municipal solid waste treatment. However, the flue gas generated by the high-temperature incineration of domestic waste in the incineration process contains a large amount of harmful components such as dioxins, heavy metals, HCL, HF, SOx, etc., so the flue gas must be treated and discharged to meet the stand...

AI Technical Summary

Problems solved by technology

The dry method is purified by spraying calcium hydroxide powder into the inlet flue of the bag filter. Although it does not produce waste water, the utilization rate of the neutralizer is too low, and the desulfurization rate cannot be guaranteed, so it is gradually eliminated; while the wet method The investment cost is high, and the wastewater produced contains heavy metal elements and causes secondary pollution, so it is generally not used for flue gas purification of domestic waste incineration

At present, the existing semi-dry method uses lime slurry as the neutralizing absorbent, which has high consumption of neutralizing agent, inflexible adjustment, poor load adaptability, easy blockage and wear of the slurry pipe and nozzle, and poor purification effect. It is not enough to meet the EU 92 standard; and the cost of introducing foreign technology and equipment is too high, and it is not conducive to the extensive and long-term use of waste incineration flue gas treatment technology in China

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