Method for removing carbon dioxide in acidic gas and apparatus therefor

A carbon dioxide and acid gas technology, applied in the removal of gas pollutants, dry distillation gas discharge devices, chemical instruments and methods, etc., can solve the problems of difficult circulation of reactants, etc., to improve economy, improve process efficiency, The effect of reducing the load

Inactive Publication Date: 2018-07-17
POHANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because both carbon dioxide and sulfur gas exhibit acidic behavior and have similar reactivity to reactants, so there are problems in handling and recycling of reactants
In addition, the maintenance / management and regeneration of the capture reactants require an economical solution, and it is difficult to ensure economic efficiency by effectively utilizing the captured carbon dioxide.

Method used

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  • Method for removing carbon dioxide in acidic gas and apparatus therefor
  • Method for removing carbon dioxide in acidic gas and apparatus therefor
  • Method for removing carbon dioxide in acidic gas and apparatus therefor

Examples

Experimental program
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Effect test

Embodiment 1

[0067] Then, in Example 1 of the present application, ammonia was added to the acid gas, and the molar ratio of carbon dioxide to ammonia in the entire mixed gas flow was adjusted to 0.7.

[0068] The gas stream to which the ammonia was added was indirectly cooled to 30°C to generate the salt. At this point, the salt generated by the reaction is white solid ammonium bicarbonate (NH 4 HCO 3 )Salt.

[0069] More specifically, image 3 It is a view analyzing the ammonium bicarbonate salt of Example 1 by X-ray diffraction (XRD). Such as image 3 Shown, with the result of X-ray diffraction analysis, confirm that the white solid salt of embodiment 1 is ammonium bicarbonate. More specifically, the image 3 Among the peaks shown in , the low-intensity peak represents ammonium bicarbonate (NH 4 HCO 3 )Salt.

[0070] The salt is then drained and removed as a slurry using steam.

[0071] The discharged slurry is heated by adding high-temperature nitrogen and steam, and is decom...

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PUM

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Abstract

The present invention relates to a method for removing carbon dioxide in acidic gas and an apparatus therefor. An embodiment of the present invention provides a method for removing carbon dioxide in acidic gas, the method comprising the steps of: purifying coke gas to prepare acidic gas; introducing ammonia into the acidic gas and then regulating the molar ratio of carbon dioxide to ammonia to 0.5or higher in the entire mixture stream; indirectly cooling the mixture stream to produce salt; removing the salt in the form of a slurry; heating the salt in the removed slurry to decompose the sameinto carbon dioxide gas, ammonia gas, and water; and collecting the decomposed ammonia gas.

Description

technical field [0001] The invention relates to a method and device for removing carbon dioxide in acid gas. Background technique [0002] Acid gases including carbon dioxide and hydrogen sulfide are gases produced in industries such as combustion and desulfurization. At this time, the content of carbon dioxide and sulfur gas is generally inversely proportional. CCS (Carbon Capture and Storage) technology has been actively developed and applied to combustion gas mainly composed of carbon dioxide, but there are the following limitations. [0003] Amine compounds, alkaline solutions such as ammonia, carbonic acid solutions, membranes, and the like for capturing carbon dioxide have limitations because they are technologies that are effective only under the condition of a trace amount of sulfur gas. This is because both carbon dioxide and sulfur gas exhibit acidic behavior and have similar reactivity to reactants, so there are problems in handling and recycling of reactants. I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/62C10B27/00
CPCC10B27/00B01D53/96B01D2252/102B01D2257/504B01D53/62Y02C20/40B01D2251/2062B01D2252/103B01D2258/0283B01D2259/122C10K1/001C10K1/003
Inventor 赵文卿朴具勇崔惠吉权雨泽崔汉永
Owner POHANG IRON & STEEL CO LTD
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