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Hot Oil Unit |
Basically, Hot Oil Units are specific heaters, which are utilized for heavy duty operation. Widely used in the plastic industry, these reliable Hot Oil Units are supported with safety features as well as instrumentation. Commercially, there are two types of units are available such as horizontal and vertical. These Hot Oil Units are gas fired and oil fired.
Why to use thermal fluid for heating?
In heating systems, usually water and steam are used as heat carriers. However, in industrial heating systems, very high temperature is required and generating such high temperature using water and steam can be expensive in terms of safety, economy, design and projecting issues, hence in hot oil units, a special oil is used instead of steam/water as the heat carrier.
Another advantage of using oil as the heat carrier is that high operating temperatures (up to 300°C) can easily be produced. In case of water and steam a very high pressure is to be maintained for generating such high temperature but in hot oil units at a pressure of 85 bar, such a high temperature can be generated.
There are several advantages of using thermal oil, especially when compared to the conventional steam systems.
The A few of them are enlisted below :
- Optional temperature level can be set up
- No risk of corrosion and freezing damages
- Low maintenance costs
- No heat loss due to hot condensate and flash steam
- The operation is noise free as it doesn't create steam stroke and flash steam noise
- Hot oil units are extremely easy to operate.
Construction of Hot Oil Units:
Hot oil units are generally made up of coils of PED certified steel tubes. The heat is transferred to the oil as radiant heat in the combustion chamber, which is made up of inner cylindrical tube coil with a flat tube coil in the bottom. The thermal fluid circulates inside these tubes and gradually gets heated up to the operational temperature. The entire process produces numerous combustion gases, which are cooled in the outer convection part.
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