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Method and device for immobilizing CO2 by enhancing mineral carbonation

A mineral carbonation, CO2 technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve problems such as difficulty in leaching calcium ions, increase effective contact area, strengthen internal diffusion mass transfer rate, particle size small effect

Inactive Publication Date: 2012-02-08
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Purpose of the invention: the purpose of the present invention is for the existing CO 2 In mineral carbonation fixation process, there is CO 2 Difficult to absorb and convert to HCO 3 - , Calcium ion leaching difficulties and other issues, the organic combination of carbonic anhydrase for CO 2 The high-efficiency catalysis of hydration reaction and the enhanced solid-liquid reaction performance of ultrasonic waves provide an enhanced mineral carbonation to fix CO 2 method and device

Method used

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  • Method and device for immobilizing CO2 by enhancing mineral carbonation
  • Method and device for immobilizing CO2 by enhancing mineral carbonation
  • Method and device for immobilizing CO2 by enhancing mineral carbonation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Contains CO 2 The industrial tail gas is produced by a fully automatic coal-fired boiler with a gas volume of 10Nm 3 / h; after dedusting and wet desulfurization, CO 2 The concentration is 13% (V / V), the temperature is 55°C; it enters the packed tower absorber filled with immobilized carbonic anhydrase filler, and the gas-liquid countercurrent contact in the absorber, the contact time is 7s, and the liquid-gas ratio is 5L / Nm 3 ; under the catalysis of carbonic anhydrase CO 2 A hydration reaction occurs and rapidly converts to HCO 3 - , to obtain HCO with a pH approximately equal to 5.1 3 - Weakly acidic solution, remove CO 2 The final tail gas leaves the packed tower absorber from the top of the tower; through the online test of the gas chromatograph, the CO 2 The removal rate was 73%.

[0032] Mix the semi-dry desulfurization ash with the HCO from the packed tower absorber at a solid-to-liquid mass ratio of 1:10 3 - Add the weakly acidic solution into the mine...

Embodiment 2

[0034] The mineral used in the experiment is steel slag, and the rest are the same as in Example 1; after testing, CO 2 The removal rate was 58%, the pH value of the slurry rose from about 5.1 to 6.8 after ultrasonic leaching for 7 minutes, and the conversion rate of mineral carbonation reaction was 71%.

Embodiment 3

[0036] The mineral used in the experiment is wollastonite, and the rest are the same as in Example 1; after testing, CO 2 The removal rate was 57%, the pH value of the slurry rose from about 5.1 to 5.6 after ultrasonic leaching for 7 minutes, and the conversion rate of mineral carbonation reaction was 61%.

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Abstract

The invention discloses a method and device for immobilizing CO2 in industrial tail gas by enhancing mineral carbonation. The device comprises a packed column absorber, a mineral leaching tank, a carbonation reactor and a belt type filter. The method comprises the steps of: enabling the industrial tail gas containing CO2 to enter the packed column absorber filled with immobilization carbonic anhydrase, rapidly transforming the CO2 into HCO3<-> under the catalysis action of the carbonic anhydrase; with a weak acidic solution containing the HCO3<-> as a mineral leaching agent, effectively leaching calcium ions from minerals in the mineral leaching tank under the action of ultrasonic waves to form a slurry enriching Ca<2+>; introducing the slurry enriching Ca<2+> into the carbonation reactor, adding a calcium-containing alkali material, regulating the pH of the slurry to be 7-9 to ensure that the HCO3<-> is transformed into CO3<2->, and generating a carbonation reaction with the Ca<2+> leached from the minerals to generate CaCO3. The invention can promote the CO2 to be rapidly transformed into the HCO3<->, can promote the calcium ions to be leached from the minerals and the carbonation reaction, and further realizes that the CO2 in the industrial tail gas is immobilized through direct carbonation under normal pressure.

Description

technical field [0001] The invention belongs to the technical field of capturing and sequestering carbon dioxide in industrial tail gas, and in particular relates to a method of using ultrasonic wave and carbonic anhydrase to strengthen mineral carbonation and fix CO 2 method and device thereof. Background technique [0002] Greenhouse gas CO 2 The advanced capture and storage technology has attracted widespread attention from the international community; among them, mineral carbonation imitation of the weathering process of natural calcium magnesium silicate minerals is the key to large-scale storage of CO 2 Important pathway for CO fixation by mineral carbonation compared to other storage technologies 2 The environmental risk is small, and CO 2 permanent storage. CO 2 The main raw materials for mineral carbonation and fixation are wollastonite CaSiO 3 , olivine Mg 2 SiO 4 , Serpentine Mg 3 Si 2 o 5 (OH) 4 Calcium-magnesium silicate minerals and certain calcium-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/62
Inventor 杨林军狄华娟潘丹萍沙焱
Owner SOUTHEAST UNIV
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