Method for implementing trapping and separation of CO2 in flue gas by adopting magnesium-based absorbent

An absorbent and flue gas technology, applied in the field of CO2 capture and separation in flue gas, can solve the problems of large equipment investment, high capture cost, large energy consumption, etc. low cost effect

Inactive Publication Date: 2012-07-18
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the chemical solvent absorption method has been studied the most, and this method occupies the CO 2 Capturing 70% of the market is also considered the most economically feasible. Absorbents used for carbon dioxide capture include ammonia water, sodium hydroxide, primary alcohol amine (MEA), secondary alcohol amine (DEA, DIPA) and tertiary Alcohol amine (MDEA), etc., after the chemical reaction of carbon dioxide and amine absorbent, a CO2-containing 2 The

Method used

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  • Method for implementing trapping and separation of CO2 in flue gas by adopting magnesium-based absorbent
  • Method for implementing trapping and separation of CO2 in flue gas by adopting magnesium-based absorbent

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Experimental program
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Embodiment 1

[0026] This embodiment combines the attached figure 1 Process of the present invention is further described in detail:

[0027] Add MgO to Absorbent Preparer 1, then add water to prepare Mg(OH) 2 Suspension, the solid-to-liquid ratio (mass ratio) of the suspension is controlled to be 3.5, and the suspension is transported by the slurry pump 2 to the CO with stirring function 2 In the absorber 3, the CO in the flue gas passed from the bottom of the absorber 2 Carry out carbonation reaction, control the pH value of the absorption system to 10.2, the temperature is 13.5°C, the CO in the flue gas passed into the absorber 2 The ratio of the amount of substance to the total amount of magnesium in the absorbent is 1.0, and the volume ratio of the absorbent to the flue gas in the absorber is 3.5;

[0028] from CO 2 The treated flue gas from the absorber 3 is discharged from the top, and the reacted mixture enters the centrifuge 4 for solid-liquid separation, and the obtained liqui...

Embodiment 2

[0031] Add MgO to the Absorbent Maker, then add water to make Mg(OH) 2 Suspension, the solid-liquid ratio (mass ratio) of the suspension is controlled to be 0, and the suspension is transported by the slurry pump to the CO with stirring function 2 In the absorber, with the CO in the flue gas 2Carry out carbonation reaction, control the pH value of the absorption system to 8.5, the temperature is 50.0°C, and the CO in the flue gas passed into the absorber 2 The ratio of the amount of substance to the total amount of magnesium in the absorbent is 0.9, and the volume ratio of the absorbent to the flue gas in the absorber is 1.8;

[0032] from CO 2 The reacted mixture from the absorber enters the centrifuge for solid-liquid separation, and the obtained liquid is circulated to the absorbent preparation process for recycling, and the obtained solid MgCO 3 ·3H 2 The O crystal is heated and dried to remove the physical moisture and chemical moisture in it, and the temperature is c...

Embodiment 3

[0035] Add MgO to the Absorbent Maker, then add water to make Mg(OH) 2 Suspension, the solid-to-liquid ratio (mass ratio) of the suspension is controlled to be 2.0, and the suspension is transported by the slurry pump to the CO with stirring function 2 In the absorber, with the CO in the flue gas 2 Carry out carbonation reaction, control the pH value of the absorption system to 9.0, the temperature is 30°C, and the CO in the flue gas passed into the absorber 2 The ratio of the amount of substance to the total amount of magnesium in the absorbent is 0.95, and the volume ratio of the absorbent in the absorber to the flue gas is 3.0 times;

[0036] from CO 2 The reacted mixture from the absorber enters the centrifuge for solid-liquid separation, and the obtained liquid is circulated to the absorbent preparation process for recycling, and the obtained solid MgCO 3 ·3H 2 The O crystal is heated and dried to remove the physical moisture and chemical moisture in it, and the tempe...

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Abstract

The invention discloses a method for implementing trapping and separation of CO2 in flue gas by adopting a magnesium-based absorbent and relates to a CO2 trapping and separation technology. According to the invention, Mg(OH)2 suspension is used as the absorbent for CO2 in the flue gas; compared with the existing CO2 trapping capacity, the CO2 trapping capacity of the method is finally greatly improved by controlling conditions of a suitable solid-to-liquid ratio of the suspension, a ratio of the absorbent to the flue gas and the like; and a food-grade CO2 product with high purity is also obtained. The method disclosed by the invention has strong CO2 trapping capacity, simple process, low trapping agent regeneration cost and strong technical applicability.

Description

technical field [0001] The present invention relates to CO 2 capture and separation technology, specifically a magnesium-based absorbent to achieve CO in flue gas 2 Methods of capture and separation. Background technique [0002] In recent years, global warming has become the focus of the international community. Greenhouse gases, especially CO 2 The large amount of emissions is the main factor of climate warming, control and reduce CO 2 Emissions are an urgent task facing human society. In my country's coal power, iron and steel, chemical, petrochemical and cement industries occupy an important position in the industry, but also the energy consumption and CO 2 important industry for emissions, so regarding CO 2 The capture technology is mainly aimed at the above industries. According to the technical basis and applicability of the capture system, the engineering circle usually regards CO as 2 The capture system is divided into the following four types: post-combustion...

Claims

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Application Information

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IPC IPC(8): B01D53/14C01B31/20B01D53/62B01D53/78C01B32/50
CPCY02C10/04Y02C10/06Y02C20/40Y02P20/151
Inventor 张军卢伟伟时清亮宋帮才
Owner HENAN UNIV OF SCI & TECH
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