US 7,841,390 B1Granted

Heat exchanger having powder coated elements

AssigneeParagon Airheater Technologies, Inc.

InventorsJack Kaser, Deborah Kaser

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Abstract

Powder coated heat exchange elements for a heat exchanger. Powder coating provides improved protective coating on surfaces of heat exchange elements. In many applications, the heat exchange elements are subjected to harsh operating conditions that promote corrosion. Traditional enamel coating tends to fracture when subjected to mechanical stresses thereby allowing corrosion inducing agents to penetrate and corrode the underlying surfaces. Powder coating reduces breaches in the protective layer. Powder coating may be adapted to withstand high temperatures so as to make them suitable for use in harsh operating environments. One such environment can be found in the processing of flue gas from fossil burning power generators, where the flue gas has a relatively high temperature and high sulfur content.

Claims41

Dependent claims

A heat exchanger comprising:

a heat exchanging body rotatable relative to a housing;
and
a plurality of heat exchange elements disposed in the heat exchanging body so as to define a plurality of channels that allow air to flow therethrough, wherein each heat exchange element includes a resilient and mechanically durable powder coating with an operational temperature limit of approximately 975° F. and consisting of dry powder particles configured to cure at a temperature above ambient to provide a protective layer configured to inhibit corrosion inducing agents formed in a selective catalytic reduction process during operation of a fossil fuel burning power plant from contacting an underlying surface of the heat exchange element to thereby resist corrosion of the heat exchange element, wherein the thickness of the powder coating on the heat exchange elements is between 1.5-2.5 mils, said thickness configured to inhibit said corrosion inducing agents from contacting said underlying surface of the heat exchange elements to thereby resist corrosion of the heat exchange elements, while not inhibiting heat transfer between the heat exchange elements and said airflow.

A heat exchanger comprising:

a heat exchanging body that rotates with respect to a housing;
a first air passage assembly disposed adjacent the heat exchanging body, wherein the air passage assembly is adapted to allow flow of air through a portion of the heat exchange body;
and
a plurality of heat exchange elements disposed in the heat exchanging body, wherein each heat exchange element defines a heat exchanging surface adapted to facilitate the heat exchange with the air flowing through the heat exchanging body, and wherein the heat exchanging surface includes a resilient and mechanically durable powder coating with an operational temperature limit of approximately 975° F. and consisting of dry powder particles configured to cure at a temperature above ambient to provide a protective layer configured to inhibit corrosion inducing agents formed in a selective catalytic reduction process during operation of a fossil fuel burning power plant from contacting an underlying surface of the heat exchange element to resist corrosion thereof, wherein the thickness of the powder coating on the heat exchange elements is between 1.5-2.5 mils, said thickness configured to inhibit said corrosion inducing agents from contacting said underlying surface of the heat exchange elements to thereby resist corrosion of the heat exchange elements, while not inhibiting heat transfer between the heat exchange elements and said airflow.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 10/793,182Filed 3 Mar 2004 · us provisional application
Priority: 3 Mar 2003
Granted: 30 Nov 2010
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

F28D 19/042
With axial flow through the intermediate heat-transfer medium: rotors; Assemblies of heat absorbing masses
F28F 19/02
Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers: by using coatings, e.g. vitreous or enamel coatings
F28D
Heat-exchange apparatus, not provided for in another subclass, in which the heat-exchange
F28F
Details of heat-exchange and heat-transfer apparatus, of general application