I am working on a natural gas gen-set and am specifying a urea-based SCR to meet the local NOx limitations. My client has asked about consideration for aqueous ammonia in lieu. Does anybody have any experience as to the differences between the two in capital cost, operating cost, level of storage, HSE considerations?
I have found an old article on-line that claims that aqueous ammonia is about 40% more on lifecycle cost, but it is about 15 years old.
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