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Heating Technology of Oil Tank

Oil tanks play a very important role in the process of oil and gas storage and transportation. In oil and gas storage, oil tanks are mostly used for oil storage. When oil is needed, the oil is discharged from the tank. In the process of oil output, it is inevitable that such a problem arises, and the oil becomes viscous due to low temperature, so that the fluidity of the oil is lowered. The oil product can not be smoothly output from the oil tank. How to solve this problem?
According to reports, the new oil tank local rapid heating technology has solved this problem very well.
Heating Technology of Oil Tank

working principle:
1. Extend the "vortex hot film heat exchanger" along the radial direction of the tank into the bottom of the tank. The heat medium (steam) goes through the tube, and the oil flows from the shell to the inner tube. The oil suction port of the shell directly connects the medium in the tank.
2,  A temperature control valve is set at the steam inlet of the heat exchanger, and the steam inlet of the heat exchanger is controlled by detecting the temperature of the oil outlet with a temperature sensor, so as to ensure the constant temperature of the oil.
The heat exchanger uses a highly efficient heat exchange element - a vortex hot film tube. Keep the oil flowing reasonably between the tubes, the thermal efficiency is 3-5 times that of the ordinary heat exchanger, and the heat transfer enhancement mechanism is:
When oil fluid flows on the inner and outer surfaces, it is designed as turbulent flow, which produces strong oscillation and scouring effect, and the direction of flow is constantly changing. It is the continuous replacement of high-temperature oil products fluids close to the surface of the pipe wall, the thinning of the insulation layer and even the destruction, the acceleration of heat transfer on the metal surface, the enhancement of micro-eddy current of the fluid, and the enhancement of thermal diffusion in the oil products fluid. It does not cause local high temperature overheating of the fluid close to the surface of the pipe wall, so that the oil can be properly and fully heated without the possibility of coking decomposition. It has good heat transfer and no great resistance.

Heating characteristics:
1. The heating speed is fast, the heat transfer efficiency is high, and it is not easy to scale.
2. Oil can be heated quantitatively, as much as it needs.
3. The oil will not have local high temperature and carbonization, which ensures the quality of the oil and the heat transfer efficiency of the heater.
4. The oil outlet has the highest temperature in the oil tank, which ensures the fluidity of the oil.
5, to avoid repeated heating of the oil in the tank, to ensure the color of the oil, reduce the cost of oil processing.
6, long service life, corrosion resistance, high temperature resistance, high pressure resistance, anti-fouling function, greatly improving the overall performance of the heat exchanger.
7. The technological structure design is advanced, which ensures the smooth flow of oil products and the better "bottom pumping" effect.
8, can achieve automatic control, according to the oil inlet and outlet temperature and oil flow rate to control the steam feed.
9. Compact structure, convenient installation and maintenance, and will not affect the safety of the tank due to the installation of the heater. Compared with the U-tube heat exchanger, in the case of the same heat exchange area: The outer dimensions of the vortex hot film heat exchanger are only about one-half of the outer dimensions of the U-tube heat exchanger.
10. Relative to the electric heating method, it is safer, the heating is milder, and the impact on the quality of the oil is smaller.
According to reports, this new tank heating technology has obtained a number of national patents, and has been applied in many oil and gas storage and transportation units of PetroChina.
Comparison of new oil tank heating technology and traditional tubular heat transfer technology:

heating method Htm Oil yield Heating up temperature heating time Condensate temperature Steam consumption
Tube heat exchanger 0.8Mpa saturated steam 60T/t 30℃-60℃ 14 hours 30 minutes 100℃ 14.6 tons
Oil tank local quick heater 0.8Mpa saturated steam 60T/t 30℃-60℃ 14 hours 30 minutes 55℃ 1.96 tons
Note: The data comes from Sinopec Lubricating Oil Measurement Comparison Table
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