Process for inhibiting corrosion and minimizing deposits in an air preheater system
AssigneeWaterScience, Inc.
InventorRobert J. Littmann
Life of this patent
Estimating the term…
Abstract
A process is disclosed for inhibiting corrosion of metal surfaces and deposition of particulates in an air preheater system. In the process, a composition (preferably aqueous) comprising a corrosion inhibiting amine and a surfactant having an HLB value of from about 8 to about 20, preferably from about 10 to about 14, is supplied to the combustion gas-in side and/or to the air-in side of the air preheater for protection of the metal surfaces and minimizing such deposits. In a preferred embodiment, the process of the invention can employ an amine salt of a C.sub.12 to C.sub.24 tertiary alkyl amine an amine oxide, or an amine oxide salt, either alone or with a surfactant.
Claims27
A process for inhibiting corrosion of metal surfaces and minimizing deposits in an air preheater system in which said metal surfaces are to be contacted with hot combustion gases and heat exchange is to be carried out between a cool air stream and said hot combustion gases comprising the step of supplying with the air to be preheated to the air-in side of said air preheater system a composition comprising a corrosion inhibiting amine or amine-substituted compound and a surfactant whereby said metal surfaces of said air preheater are thereby coated with said composition when they are contacted with said hot combustion gases.
A process for inhibiting corrosion of metal surfaces and minimizing deposits in an air preheater system in which said metal surfaces are to be contacted with hot combustion gases and heat exchange is to be carried out between a cool air stream and said hot combustion gases comprising the step of supplying with the air to be preheated to the air-in side of said air preheater system a composition comprising a corrosion inhibiting amine or an amine-substituted compound whereby said metal surfaces of said air preheater are thereby coated with said composition when they are contacted with said hot combustion gases.
A process for inhibiting corrosion of metal surfaces and minimizing deposits in an air preheater system comprising the step of supplying to the air preheater system a composition comprising a corrosion inhibiting amine selected from the group consisting of lauryl dimethyl amine oxide, and a C.sub.12 to C.sub.24 tertiary alkyl amine salt and a surfactant having an HLB value of from about 8 to about 20.
A process for inhibiting corrosion of metal surfaces and minimizing deposits in an air preheater system comprising the step of supplying to the air preheater system a composition comprising a corrosion inhibiting amine in the form of a tertiary alkylamine salt selected from 7-pentyl-7-pentadecylammonium sulfate or 4-propyl-4-decylammonium surface and a surfactant having an HLB value of from about 8 to about 20.
A process for inhibiting corrosion of metal surfaces and minimizing deposits in an air preheater system comprising the step of supplying to the air preheater system a composition comprising a corrosion inhibiting amine and a surfactant having an HLB value of from about 8 to about 20 selected from the group consisting of alkanolamides, block copolymers of ethylene oxide and propylene oxide, ethoxylated alcohols, ethoxylated alkyl phenols and mixtures thereof.
Dependencies are inferred from the claim text.