System and method for recovering ammonia from a chilled ammonia process
AssigneeALSTOM Technology Ltd
InventorSanjay Kumar Dube
Life of this patent
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Abstract
An ammonia recovery system and method for removing ammonia from a gas stream is provided. The system includes an ammonia recovery vessel for contacting a solution, having a dissolved acidic salt, with the gas stream, having ammonia. The dissolved acidic salt solution absorbs the ammonia in the gas stream to provide an ammonia-lean gas stream and an ammonia-rich solution. The ammonia-rich solution is heated within an ammonia stripper to release the ammonia from the ammonia-rich solution to thereby generate an ammonia-rich gas stream and the solution having dissolved acidic salt. A heat exchanger heats the dissolved acidic salt from the ammonia stripper prior to the solution being provided to the ammonia recovery system. The acidic salt has a low thermal decomposition.
Claims20
An ammonia recovery system for removing ammonia from a gas stream, the system comprising:
- an ammonia recovery vessel for contacting a solution having a dissolved acidic salt with the gas stream having ammonia wherein the dissolved acidic salt solution absorbs the ammonia in the gas stream to provide ammonia-lean gas stream and an ammonia-rich solution;
- an ammonia stripper including a vessel that receives and heats the ammonia-rich solution from the vessel to release the ammonia from the ammonia-rich solution to generate an ammonia rich gas stream comprising ammonia and water, and the solution having dissolved acidic salt;
- a heat exchanger for receiving the dissolved acidic salt solution from the ammonia stripper and heating the solution prior the solution being provided to the ammonia recovery vessel;
- wherein the acidic salt has a low thermal decomposition temperature.
A method of removing ammonia from a gas stream, the method comprising:
- contacting within a first vessel a solution having a dissolved acidic salt with the gas stream having ammonia wherein the dissolved acidic salt solution absorbs the ammonia in the gas stream to provide ammonia-lean gas stream and an ammonia-rich solution;
- heating within a second vessel the ammonia-rich solution to release the ammonia from the ammonia-rich solution to generate an ammonia rich gas stream comprising ammonia and water, and a solution having dissolved acidic salt;
- heating the dissolved acidic salt solution;
- providing the heated dissolved acidic salt solution back to the first vessel;
- wherein the acidic salt has a low thermal decomposition temperature.
Dependencies are inferred from the claim text.