How is waste heat boilers categorized?

How is waste heat boilers categorized?
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Answer :

Chemical plants -(hydrogen, nitrogen, sulfuric acid, sulfur recovery) Incineration plants-(fumes,  chemicals, municipal solid waste) Refineries-(cat cracker, CO off gases) Cogeneration, combined cycle  plants-(gas turbine, diesel engine exhaust) Furnaces, kilns-(exhaust gases) See a complete table at the  link below.
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