Process Equipment Update
technology for fruit aseptic plants is based on our corrugated double tube heat exchangers, piston pump, and our aseptic filler. Combining them makes it possible to process the fruit pulp and purée while minimising the undesirable thermal effects and getting a reliable, hygienic and well controlled filling process”, said Carlos Cobian, general manager, HRS Process Technology.
Exhaust gas cooling In innovation news, HRS has launched its new G series heat exchanger for exhaust gas cooling applications (Fig. 1). A new design that provides a superior thermal performance with increased efficiency, the G series has been introduced to the market with a compact design to minimise pressure drops whilst maximising heat recovery efficiency and reducing process costs. The corrugated tube technology enables HRS to provide more compact units, ensuring higher heat transfer rates than smooth tube designs. The heat exchangers’ key features include a larger
diameter interior tube, a full stainless steel design to provide robustness and durability and an expansion bellow fitted within the outer shell to absorb the differential expansion between the shell and inner tube.
Steel solution Outokumpu, a world-leading company in custom-made products in coarse, special stainless steel (quarto) - has invested heavily in its rolling mill in Degerfors, Sweden. Cooling the machine shop to enable it to provide the best service to the rolling mill is of crucial importance. The investment will enable a 30 per cent increase in
the annual production of hot-rolled stainless steel plate, to a total of 155,000 tonnes. However, the investment increases not only the
production capacity, but also the product’s dimensional accuracy and performance. To cool the rolling mill’s machine shop, Outokumpu
has chosen a solution that saves energy compared with more conventional alternatives. There are two ways to
cool the machine shop. One is to use outdoor air, the other to use industrial water from a nearby river and cool the air through existing cooling coils and a SWEP B649 brazed plate heat exchanger (BPHE). The plant is optimised for seasonal changes in order
to constantly maintain the right temperature, while minimising the energy consumption of the pumps. Outokumpu’s Peter Svedrin is project manager
for the installation at Degerfors, and responsible for ensuring the quality of the cooling and ventilation in the machine shop. “Unless the space is cooled, it may become too hot,” he says. “There is an increased heating effect when more power is installed in the plant. The heat must be removed to prevent the equipment from ageing prematurely. This is why the temperature must be a consistent 24°C in the machine shop throughout the year.” SWEP’s B649 is used to transfer cold from water
drawn from the river out into the system via a loop. The river water is used as an alternative to outdoor air. The air is cold enough in late autumn, winter, and early spring, but in summer the river offers an alternative. In the most recent winter, the heat exchanger only
needed to use a fifth of its dimensioned effect. When the highest seasonal temperatures are reached, the BPHE helps to remove 1.2MWh excess heat. David Ingvarsson, application engineer at SWEP,
is pleased that the company’s heat exchangers are meeting the customer’s demands for cooling equipment using river water: “We are delighted to contribute to environmentally sustainable solutions. We offer a capacity that matches the space available in the machine room, and our product is vitally important to Outokumpu in this application. The heat exchanger’s operational dependability is key to preventing costly downtime.” According to Svedrin, Outokumpu’s choice of
SWEP for this installation was based on a previous partnership, in which a 2007 feasibility study led to the successful installation of heat exchangers in 2008.
A
Allied Heat Transfer system analysis upgrade performing – and why.
llied Heat Transfer has expanded its ability to analyse heat exchangers and cooling systems while the equipment is still in service – providing significant benefits for its customers.
The company uses a variety of test equipment to map the actual operating conditions of an installation, and Heat Transfer Research (HTRI) software for the analysis. HTRI is an internationally recognised method of performing these types of analyses. Allied can then provide an accurate report on how a particular unit is
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Modifications to existing exchangers or coolers that may be derived from such analyses can be undertaken at the company’s own workshop in order to produce higher performance and service reliability. Changes made can be verified by performing follow up tests on site. Further to this, air cooled heat exchanger performance can be simulated in-house on Allied’s air cooled heat exchanger test unit which provides accurate performance results from tests of scale model versions of existing equipment. By
fitting a scale model to the test unit, the company can simulate various scenarios and report on the measured performance of the exchanger with changes to air flow, fluid flow, construction types, operating temperatures and more . Allied Heat Transfer operates a quality management system accredited by Det Norske Veritas and is an accredited NATA test facility for pressure vessels. In addition to the quality and mechanical testing systems, the company operates to stringent health, safety and environmental policies. ■
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