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Spiral heat exchanger with Anti-fouling properties

a heat exchanger and spiral technology, applied in the direction of indirect heat exchangers, conduit assemblies, lighting and heating apparatus, etc., can solve the problems of increased pressure drop, reduced heat transfer, and spiral heat exchangers may over time get fouled, etc., to reduce the fouling of sheets and high resistance to crack formation

Inactive Publication Date: 2014-10-30
ALFA LAVAL CORP AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides an improved spiral heat exchanger with reduced fouling and wear resistance. A coating is applied to the sheets using sol-gel material with organosilicon compounds to lower surface energy and roughness, leading to easier cleaning and reduced fouling. The coated sheets also have high resistance against cracks.

Problems solved by technology

In many industrial processes fouling of heat transfer equipment is of concern.
Spiral heat exchangers may over time get fouled due to a slow deposition of material on the surfaces of the sheets.
Such so called crystallized fouling leads to a decreased heat transfer and increased pressure drop, and results in an overall reduced performance of the spiral heat exchanger.
Depending e.g. on the fluids used the spiral heat exchanger may be seriously fouled and difficult to clean, thus requiring strong detergents and / or powerful mechanical cleaning over a substantial time period in order to restore the performance of the heat exchanger.
The cleaning of spiral heat exchangers may both be time consuming and costly.
The base material, i.e. metals used, may have a high surface free energy that results in most liquids easily wetting the surface of the sheets.
Also, when spiral heat exchanger sheets are produced the forming operation thereof may increase the surface roughness which often is associated with faster build up of fouling deposits.
A problem encountered with presently known anti-fouling coatings is the poor wear resistance of the coatings in applications with abrasive heat exchanging media, e g sand or other particulate material which enters the spiral heat exchanger with the heat exchanging fluids.
Furthermore, cracks in the coating may occur due to torque and tension forces acting on the spiral heat exchanger sheets in applications under high pressures.

Method used

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  • Spiral heat exchanger with Anti-fouling properties
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Examples

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examples

[0044]In the search for prolonged operational time of off-shore equipment, tests were conducted on low surface energy glass ceramic coatings.

[0045]Two low surface energy glass ceramic coatings, Coat 1 and Coat 2, were tested and the results are presented below. Coat 1 is a silan terminated polymer in butyl acetate and Coat 2 is a polysiloxan-urethan resin in solvent naphtha / butylacetate.

[0046]Phase A

[0047]The analysis shows properties of the coatings concerning substrate wetting and adhesion, contact angle, coating thickness and stability against 1.2% HNO3 in H2O, 1% NaOH in H2O and crude oil. The results are summarized below in Table 1.

TABLE 1Coat 1Coat 2SubstrateExcellentExcellentwettingSubstrateAl: 0 / 0Al: 0 / 0adhesionStainless steel: 0 / 0Stainless steel: 0 / 0Ti: 0 / 0 (see below)Ti: 0 / 0 (see below)Contact angleH2O: 102-103°H2O: 102-103°measurementsCoating4-10 μm2-4 μmthicknessStability1.2% HNO3 in H2O:1.2% HNO3 in H2O:1½ h at 75° C.1½ h at 75° C.1% NaOH in H2O:1% NaOH in H2O:3 h at 85...

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Abstract

The invention relates to a spiral heat exchanger comprising a spiral body formed by at least one spiral sheet wound to form the spiral body forming at least a first spiral-shaped flow channel for a first medium and a second spiral-shaped flow channel for a second medium, wherein the spiral body is enclosed by a substantially cylindrical shell being provided with connecting elements communicating with the first flow channel and the second flow channel. At least a part of the spiral heat exchanger is provided with a coating comprising silicon oxide, SiOx.

Description

TECHNICAL FIELD[0001]The present invention refers generally to spiral heat exchangers allowing a heat transfer between two fluids at different temperature for various purposes. Specifically, the invention relates to a spiral heat exchanger which has been coated for improving anti-fouling properties and has in some embodiments been given predetermined, structural properties for ensuring that the coating remains on the product when the product is used.BACKGROUND ART[0002]Spiral heat exchangers are generally formed by winding two metal sheets around one another so as to delimit two separate passages. The two flat sheets are welded together at a respective end, wherein the welded joint will be comprised in a center portion of the sheets. The two sheets are wound around one another to form the spiral element of the sheets so as to delimit two separate passages or flow channels. Distance members, having a height corresponding to the width of the flow channels, may be arranged on one or bo...

Claims

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Application Information

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IPC IPC(8): F28F21/00
CPCF28F21/00C09D5/1675F28F19/04F28D9/04C09D183/04
Inventor SVENSSON, TOBIASANEHAMRE, JONASNILSSON, MATS
Owner ALFA LAVAL CORP AB
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