IMPROVING OF AMMONIA SCRUBBING PROCESS FOR THE REMOVAL OF CARBON DIOXIDE FROM FLUE GAS

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Ratko Balić
Marija Ječmenica Dučić
Gvozden Tasić
Sanja Petronić
Đurica Katnić

Abstract

This paper provides results of improving ammonia scrubbing process for the removal of carbon dioxide from flue gas. Previous research results indicated the potential of CO2 reduction by NH3 scrubbing is very promising. The overall CO2 removal efficiencies could be above 95% under proper operating conditions. Although, in reality, there were problems occurring during the process itself. Most important and often the problem is contamination of ammonia solution during the process with technical water, used for solution chilling part of the process. When that happens, the solution is contaminated with Na+ ions, and the result of CO2 removal efficiencies will decrease. A solution for this problem is found in adding an additional adsorbent column in a phase of cooling the of ammonia solution. Adsorbents tested for this purpose were natural zeolite and cation exchange resin. Zeolite was prepared in two different ways, first was washing with deionized water and air drying, and the second way was washing with deionized water and drying zeolite on 500ºC. Results showed that zeolite that was prepared by washing with deionized water and air drying removed almost all Na+ ions from ammonia solution, so in conclusion, this process was improved, and regeneration of ammonia solution is improved.

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References

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