Dry and semi-dry methods for removal of ammonia from fly ash
AssigneeBrown University Research Foundation
InventorsArun K. Mehta, Robert H. Hurt, Yuming Gao, Xu Chen, Eric M. Suuberg
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Abstract
A method for removing ammonia from fly ash employs water mist (a water fog) or a flowing warm humid air stream to rid the fly ash of ammonia. Ozone alone or with other co-oxidants such as hydrogen peroxide are also used to rid fly ash of ammonia.
Claims24
A method for removing ammonia from fly ash comprising subjecting ammonia containing fly ash to a water mist or fog wherein the water mist or fog contacts the ammonia containing fly-ash and removes the ammonia from the fly ash and then subjecting the fly ash to gas/particle separation to produce a fly ash of reduced ammonia content.
A method for removing ammonia from fly ash comprising subjecting ammonia containing fly ash to warm humid air wherein the warm humid air contacts the ammonia containing fly-ash and dissolves and removes the ammonia from the fly ash and then subjecting the fly ash to gas/particle separation to produce a fly ash of reduced ammonia content.
A method for reducing ammonia on fly ash comprising applying effective amounts ozone to the surface of ammoniated fly ash to reduce ammonia thereon.
A method for removing ammonia from fly ash comprising applying to the surface of ammoniated fly ash both 1-5% moisture and ozone treatment to accomplish dry or semi-dry (<5 wt-% moisture) ammonia reduction at temperatures below 150° C.
A method for ridding fly ash of ammonia comprising applying a mixture of hydrogen peroxide (H2O2) and ozone as co-oxidizing agents in amounts effective to reduce ammonia in fly ash as a flowing fog or mist during semi-dry ash treatment.
Dependencies are inferred from the claim text.