A: At ambient temperatures, Heavy Fuel Oil (HFO) or Bunker C is extremely viscous, resembling a semi-solid tar. It cannot be pumped efficiently or atomized cleanly. A fuel oil heat exchanger raises the oil’s temperature (typically to 100C° – 150C°), dropping its viscosity to a range suitable for smooth filtration, precise pumping, and ideal burner nozzle atomization. This guarantees complete, smokeless combustion and protects downstream engine components.

A: Coking (or carbon fouling) occurs when the fuel oil is exposed to excessively high, localized surface temperatures, causing the heavy hydrocarbons to crack and bake onto the exterior of the heater tubes. This creates a thermal barrier that degrades efficiency.
Datang Finned Tube solves this by utilizing custom high-frequency welded (HFW) or laser-welded finned tubes. The extended fin surface spreads the thermal energy across a much larger area on the oil side, lowering the local tube wall temperature and eliminating the “hot spots” that cause coking.

A: You should opt for a U-Tube design if your system utilizes high-temperature media (like thermal oil at 200C° or superheated steam) and experiences frequent start-stop cycles. The U-tube bundle is anchored only at one end, allowing it to expand and contract freely within the shell. This completely eliminates the severe thermal stress and joint cracking that can occur in a rigid Fixed Tube Sheet design under radical temperature differentials.

A: Traditional bottom tank coils heat the entire bulk volume of the heavy oil storage tank to maintain fluidity, which wastes a massive amount of thermal energy. A Tank Suction Heater (installed at the tank outlet flange) is a specialized open-ended shell-and-tube module. It only heats the specific volume of fuel actively being drawn out by the pump. This “on-demand” heating significantly reduces your facility’s utility bills and boiler fuel consumption.

A:The most prevalent and reliable configuration for this application is the shell-and-tube heat exchangers. Because heavy fuels require heating under continuous flow and often at elevated pressures, the structural integrity of the finished vessel is paramount.

Operation: A high-temperature heating medium—typically steam or thermal oil—flows through the interior of the tube bundle. The cold, viscous fuel oil is pumped through the shell, flowing over the outside of the tubes to absorb the heat.

Material Selection: The tube bundles and shell are subjected to harsh conditions. Depending on the operating environment, they are typically fabricated from carbon steel or stainless steel. For marine offshore applications where seawater corrosion is a factor, alloys like copper-nickel or titanium are heavily utilized.

Manufacturing Standards: To guarantee safe pressure containment and longevity, these finished heat exchangers are manufactured in strict accordance with international codes such as ASME (American Society of Mechanical Engineers) and API (American Petroleum Institute).