Spiral Heat Exchanger (SHE) Technology

For those working in the Energy sector or across a wide array of Industries including the Petrochemical, Natural Gas, Petroleum and Food; you’ll be familiar with the need for world class Heat Exchanger technology.Heat Exchangers are designed for efficient cross-medium heat transfer and often form an integral part of day to day operations across a wide number of Engineering based industries.

These days, industry leaders across the globe are becoming more and more aware of the advantages of installing Spiral Heat Exchangers as their primary method of heat transfer.

A Spiral Heat Exchangers (or SHE) is a coiled tube arrangement, with two channels coiled one around the another. These two channels operate in a counter-flow arrangement, offering excellent turn down ratios, while optimising flow patterns which in turn, enhance heat transfer.

The Advantages of the Spiral Heat Exchanger Technology

In the 21st Century, Spiral Heat Exchangers are proving themselves in a number of extremely important areas. Most notably SHE technology is environmentally friendly, highly efficient, easy to clean as well as efficient in its use of space.

All these factors add up to an extremely cost effective solution. Below is an in depth overview of the most important advantages of this technology:

Environmentally friendly

A compact Spiral Heat Exchanger will provide your operation with a reduced carbon footprint, which is both environmentally friendly and able also to lower overall costs.

Efficient use of space

Another clear advantage of using a Spiral Heat Exchanger ahead of a traditional Heat Exchanger unit is its extremely efficient use of space.

Reduce costs

Throughout the design phase, allocating less space in your factory or plant can allow for far more effective use of equipment, thus reducing long term costs.

Efficiency in the overall operation

An oversized Spiral Heat Exchanger has other advantages including reduction in occurrence of pressure drop, higher thermal efficiency and reduction in overall energy costs. These factors all contribute to a heightened level of efficiency throughout your operation as a whole.

Easy to clean

The other prized asset of this technology is that thanks to a robust design and low fouling properties; and by employing a self-cleaning mechanism, cleaning costs are reduced to an absolute minimum. This factor alone often makes the SHE more attractive than traditional heat exchangers as it increases efficiency, cuts down on labour costs and saves time.

Versatility and the Construction of the Spiral Heat Exchanger

For those working in the Energy sector or across a wide array of Industries including the Petrochemical, Natural Gas, Petroleum and Food; you’ll be familiar with the need for world class Heat Exchanger technology.

Heat Exchangers are designed for efficient cross-medium heat transfer and often form an integral part of day to day operations across a wide number of Engineering based industries.

Compact Construction
It consists of two parallel sheet-metal coils that are wound in such a way to form two separate channels.

The distance between the sheet metal coils in the spiral channels are maintained by using spacer studs that are welded prior to winding.

Once the main spiral pack has been wound, alternate top and bottom edges are welded and each end closed by a gasketed flat body. This ensures no mixing of the two fluids will occur.
If a leakage happens, it will be from the periphery cover to the atmosphere or to a passage containing the same fluid.

Cross Industry Applications

Spiral Heat Exchangers have a variety of important applications across many different Industries.

Most commonly, you’ll find SHE technology employed in Pasteurization, Pre-Heating, (for use in Recuperators) and in Sludge treatment. Along with these you’ll find them in other general uses such as in heat recovery, effluent cooling and digester heating.

Pasteurization

Also known as thermal treatment in the food Industry sees the heating of foodstuffs to reduce harmful pathogens prior to sale. Installation and use of Spiral Heat Exchangers in this area can increase heat exchange and energy efficiency – lowering energy misuse throughout an operation.

Recuperators (Exhaust and Air Handling Systems)

Combustion is used across many types of processes as a means of generating heat. A recuperator serves to reclaim this heat, reuse it or recycle it in order to increase overall efficiency. A recuperator employs counter flow energy recovery via heat exchange. It is in this area where installation of a SHE will have the greatest impact on heat recover and allow for highly improved efficiency.

Sludge Treatment (Thermal depolymerisation)

This process uses hydrous pyrolysis to convert reduced complex organics into oils. Heat exchange technology is required throughout this treatment and it is widely recognised that Spiral Heat Exchangers are the most effective option in this area. The most notable upside in use of a SHE in Sludge treatment comes in self-cleaning and the capacity to easily withstand a variety of chemicals throughout the process.

Types of Flows in a Spiral Heat Exchanger

A SHE condenser has advantages over regular condenser technology thanks largely to their unique flow arrangement. A SHE condenser is also perfect for condensing mixed vapours, with or without the inclusion of inert gases. This type of condenser allows for flow of – Counter-current, co-current and a mixture of both, offering a high level of versatility.

Counter-current Flow

Both fluid flow in opposite directions and are used for liquid-liquid applications.

Spiral/Cross Flow

One fluid is in spiral flow and the other in a cross flow. Spiral flow passages are welded at each side for this type of spiral heat exchanger. This type of flow is suitable for handling liquid-liquid applications if one liquid has a considerably greater flow rate than the other or the liquid cannot be mixed with the other liquid.

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