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

A technology of domestic waste incineration and fixation method, which is applied in the field of fixing carbon dioxide in flue gas of domestic waste incineration plants, can solve the problems of strict flue gas temperature requirements, small treatment scale, slow absorption rate, etc., so as to avoid scaling problems and cost. low, demand-reducing effect

Inactive Publication Date: 2015-05-06
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

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Effect test

Embodiment 1

[0045] With pure CO 2 As a simulated gas, continuously inject such as 147mL / min figure 1 The absorption device, the incineration plant leachate comes from the landfill leachate stock solution of Jiangqiao Waste Incineration Plant as an absorbent, and its Ca 2+ The content is 3492mg / L, Mg 2+ The content is 897mg / L, the alkalinity is 14121mg / L, the pH is adjusted to 9.7 with sodium hydroxide and boric acid, the reaction temperature is 200°C, and the gas flow rate is at a gas-liquid ratio of 0.5m 3 / L; when the reaction is over, the content of Ca ions is 526mg / L, the pH of the leachate is 7.5, and the CO in the tail gas 2 Concentration 2 Separation, CaCO 3 get precipitated by figure 2 It can be seen that the precipitate contains a large amount of calcium carbonate and magnesium carbonate.

Embodiment 2

[0047] With 10.53% CO 2 As a simulated gas, continuously inject such as 152mL / min figure 1 The absorption device, the leachate comes from the leachate stock solution of the Shanghai Laogang Landfill as the absorbent, and its Ca 2+ The content is 2937mg / L, Mg 2+ The content is 682mg / L, the alkalinity is 18379mg / L, the pH is adjusted to 11 with sodium hydroxide and boric acid, the reaction temperature is 100°C, and the gas flow rate is at a gas-liquid ratio of 0.1m 3 / L, the running time is 9h; when the reaction ends, Ca 2+ The content is 451mg / L, the pH of the leachate is 7.0, and the CO in the tail gas 2 Concentration 2 Separation, CaCO 3 get precipitated by figure 2 It can be seen that the precipitate contains a large amount of calcium carbonate.

Embodiment 3

[0049] With 8% CO 2 As a simulated gas, continuously inject such as 152mL / min figure 1 The absorption device, the leachate of the incineration plant comes from the raw liquid of the landfill leachate of the Jiangqiao Waste Incineration Plant as an absorbent, and the Ca in the leachate 2+ The content is 3492mg / L, Mg 2+ The content is 897mg / L, the alkalinity is 14121mg / L, the pH is adjusted to 6.5 with sodium hydroxide and boric acid, the reaction temperature is 20°C, and the gas flow rate is at a gas-liquid ratio of 0.3m 3 / L; when the reaction is over, the Ca ion content in the leachate is 451mg / L, the pH of the leachate is 7.0, and the CO in the tail gas 2 Concentration 2 Separation, CaCO 3 get precipitated by figure 2 It can be seen that the precipitate contains a large amount of calcium carbonate.

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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...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/62
CPCY02A50/20
Inventor 楼紫阳李文浩李安定朱南文袁海平周心怡
Owner SHANGHAI JIAO TONG UNIV
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