Aqua ammonia process for simultaneous removal of CO₂, SO₂ and NO_x
by Kevin P. Resnik, James T. Yeh, Henry W. Pennline
International Journal of Environmental Technology and Management (IJETM), Vol. 4, No. 1/2, 2004

Abstract: Experimental research work in applying aqueous ammonia solution for the simultaneous reduction of acidic gaseous emission from fossil fuel-fired utility plants is currently being performed at the National Energy Technology Laboratory. The traditional monoethanolamine process for CO₂ removal suffers the disadvantages of low carbon dioxide loading capacity, equipment corrosion, amine degradation by SO₂ and O₂ in flue gas, and high energy penalty during absorbent regeneration. The aqueous ammonia process can simultaneously remove CO₂, SO₂, NO_x, plus HCl and HF that may exist in the flue gas. There could be oxidation of SO₂ and NO prior to contacting the aqueous ammonia absorbent. Test results pertaining to the ammonia/carbon dioxide reaction in a semi-continuous reactor system are presented. The parametric effects of sparger design, reaction temperature, and ammonia concentration on gas loadings and absorption rates are discussed. Regeneration test results, including solution-cycling between the regeneration and absorption steps to determine a realistic loading capacity for the ammonia solutions are also presented.

Online publication date: Wed, 26-May-2004

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