CHEMICAL CLEANING METHOD AND SYSTEM WITH STEAM INJECTION
First Claim
1. A method for removing deposits and impurities from the secondary side of a heat exchanger comprising the steps of:
- removing a volume of working fluid from the secondary side of the heat exchanger sufficient to expose an access penetration;
installing a temporary adapter in the exposed access penetration, the adapter being configured for direct steam injection;
injecting steam through the temporary adapter and into the secondary side of the heat exchanger, wherein the injected steam heats the heat exchanger and residual fluid to a target cleaning temperature range; and
maintaining the heat exchanger and the residual fluid within the cleaning target temperature range during a cleaning period.
9 Assignments
0 Petitions
Accused Products
Abstract
Disclosed are methods and apparatus for cleaning heat exchangers and similar vessels by introducing chemical cleaning solutions and/or solvents while maintaining a target temperature range by direct steam injection into the cleaning solution. The steam may be injected directly into the heat exchanger or into a temporary side stream loop for recirculating the cleaning solution or admixed with fluids being injected to the heat exchanger. The disclosed methods are suitable for removing metallic oxides from a heat exchanger under chemically reducing conditions or metallic species such as copper under chemically oxidizing conditions. In order to further enhance the heat transfer efficiency of heating cleaning solvents by direct steam injection, mixing on the secondary side of the heat exchanger can be enhanced by gas sparging or by transferring liquid between heat exchangers when more than one heat exchanger is being cleaned at the same time.
13 Citations
19 Claims
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1. A method for removing deposits and impurities from the secondary side of a heat exchanger comprising the steps of:
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removing a volume of working fluid from the secondary side of the heat exchanger sufficient to expose an access penetration; installing a temporary adapter in the exposed access penetration, the adapter being configured for direct steam injection; injecting steam through the temporary adapter and into the secondary side of the heat exchanger, wherein the injected steam heats the heat exchanger and residual fluid to a target cleaning temperature range; and maintaining the heat exchanger and the residual fluid within the cleaning target temperature range during a cleaning period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A system for removing deposits and impurities from a secondary side of a heat exchanger comprising:
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a first adapter configured for temporary installation on a first conventional access penetration, the first adapter further comprising a flange configured for mating to the access penetration; means for securing the adapter to the access penetration; a conduit for introducing or removing fluid through the access penetration; and an opening provided within the secondary side of the heat exchanger; a steam source configured for connection to the conduit; and a controller configured for controlling the steam injection into the secondary side of heat exchanger through the adapter. - View Dependent Claims (16, 17, 18, 19)
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Specification