Fixing method of carbon dioxide in flue gas of municipal solid waste incinerator

Abstract

The invention discloses a fixing method of carbon dioxide in flue gas of a municipal solid waste incinerator. The fixing method comprises the following steps: by adopting absorption devices including a water regulating tank, an absorption tower, a separation tower and an absorption tank, with a leachate of the incinerator as an absorbent, introducing the flue gas containing CO2 generated by waste incineration into the leachate at a certain flow rate, carrying out rapid reaction on a great amount of ions including calcium ions and magnesium ions contained in the leachate and the CO2 in the flue gas in the absorption tower, enabling a liquid after reaction to produce a carbonate precipitate in the separation tower by virtue of pH regulation, realizing solid-liquid separation, achieving fixing and separation of the CO2 in the flue gas, absorbing released CO2 by adopting ammonia to produce an ammonium bicarbonate fertilizer, or enabling the released CO2 to reflux to the absorption tower, and trapping, separating and solid storing the CO2 in the flue gas of the municipal solid waste incinerator in an internal circulation mode. According to the fixing method disclosed by the invention, the CO2 in the flue gas of the municipal solid waste incinerator is effectively controlled by adopting the internal circulation mode; the fixing method has the advantages that the absorbent is wide in source, low in cost and high in efficiency, is capable of solving the problem of scaling of the leachate in subsequent processing and is suitable for trapping and fixing the CO2 in the flue gas of the municipal solid waste incinerator.

Description

technical field [0001] The invention relates to the treatment of flue gas from an incineration plant, in particular to a carbon dioxide (CO 2 ) fixing method belongs to the technical field of environmental protection. Background technique [0002] After the Copenhagen Conference in 2009, global warming has become an environmental issue of worldwide concern. How to realize various man-made CO 2 Effective control has become a research hotspot. [0003] Flue gas is an important CO 2 Man-made emission sources, including thermal power plants and incineration plants, among which CO contained in flue gas emitted by incineration plants due to the incineration of various organic substances 2 Up to 11-12% more CO than thermal power plant emissions 2 The content is higher. With the continuous advancement of my country's urbanization process, more and more domestic waste will be treated in the incineration mode. Therefore, on the basis of the control of secondary pollutants in the...

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Problems solved by technology

[0006] The purpose of the present invention is to address the shortcomings of the prior art in which exogenous solvents are used to absorb carbon dioxide in flue gas, and to overcome its strict requirements on flue gas temperature, small processing scale, need for exogenous absorbents, high cost, To solve problems such as slow absorption rate, provide a kind of waste incineration plant flue gas CO 2 The immobilization method uses leachate, another by-product of the incineration plant, as an absorbent, and makes full use of a large amount of cations such as calcium and magnesium contained in the landfill leachate to react with carbon dioxide to absorb carbon dioxide in the incineration flue gas. Realize the internal circulation treatment of pollutants in waste incineration plants, reduce costs, effectively treat incineration flue gas under wide temperature conditions, and be suitable for flue gas treatment in various scales of domestic waste incineration plants, so as to improve social and economic benefits

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