What is the primary purpose of using fuel heaters?

The primary purpose of using fuel heaters is to prevent paraffin formation. In certain types of fuels, especially those that are derived from crude oil, there is a risk that paraffin wax can crystallize as the temperature drops. This crystallization can lead to clogging in the fuel system, negatively impacting fuel flow and the performance of the engine. By using fuel heaters, the fuel is maintained at a temperature that prevents this wax from forming, ensuring a smooth flow and reliable performance of the gas turbine engine.

Additionally, the other options, while they may relate to fuel management and system efficiency, do not serve the primary function of the fuel heater. Increasing fuel pressure is typically managed by pumps and not directly linked to heating. Enhancing fuel efficiency can be a benefit of maintaining optimal temperature, but it is not the main reason for installing fuel heaters. Cooling the fuel before injection is counterproductive, as fuel needs to be at an appropriate temperature for efficient combustion and system operation. Thus, preventing paraffin formation stands out as the fundamental role of fuel heaters in gas turbine systems.