Process Equipment Update
High heat transfer capacities, along with increased surface area, reduced fouling and ease of maintenance are the driving forces in heat exchanger technology
development and use. Sean Ottewell reports.
Increased rates of heat transfer from latest heat exchangers
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n Turkey, HRS Heat Exchangers has supplied WABAG with a customised thermal transfer solution for use in a sewage treatment
application in Siverek.
WABAG is one of the world’s leading suppliers and installers of water and wastewater treatment plants and the Siverek plant provides sewage treatment to residents throughout a region of south eastern Turkey.
At the plant, sewage sludge is treated in an anaerobic digester to breakdown the biodegradable material and produce methane gas. Once captured, the gas is used to power the plant, significantly reducing overall operational energy costs and improving site efficiencies. In addition, any additional supply of this renewable, green power can be fed into the local grid to provide wider benefit to the local community.
Fig. 1. Luvata has doubled the manufacturing space at its heat exchanger facility in Juarez, Mexico.
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HRS says that its DTI heat exchangers are suitable for heating sludge in anaerobic digesters as the corrugated tubes provide an internal tube profile that inhibits fouling tendencies and increases the rate of heat transfer. Fouling or snagging of waste particles is prevented by having no change in cross-sectional area along the length of the heat exchanger and
the increased turbulence from the corrugation improves heat transfer efficiency. This increased efficiency results in a shorter length to meet the required thermal duty offering a more compact and effective design with a smaller footprint.
The two DTI heat exchangers installed by WABAG are mounted on a common stainless steel clad frame and are used for digester heating. Both are thermally insulated.
WABAG senior mechanical engineer Ersin Sagir explained the thinking behind the new technology: “WABAG is committed to investigating ways of increasing the efficiency of our installations and effectively reducing the carbon footprint of our customers. The new heat exchangers from HRS will help towards ensuring we optimise the Siverek plant efficiency.”
In a separate development, HRS Heat Exchangers has a
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