Oil tanks play a very important role in the process of oil and gas storage. In oil and gas storage, oil tanks are mostly used for oil storage. When oil is needed, the oil is exported from the oil tank. In the process of oil export, it is inevitable to encounter such a problem. Because of the low temperature, the oil becomes viscous, which reduces the fluidity of the oil, which leads to the failure to export the oil from the oil tank smoothly. How to solve such a problem? According to reports, the new local rapid heating technology of oil tank has solved this problem well.
working principle:
1. The "vortex hot film heat exchanger" extends into the bottom of the oil tank along the radial direction of the oil tank, and the heat medium (steam) takes the tube side, and the oil product flows between the Ned tubes of the shell side, and the oil suction port of the shell directly communicates with 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 through the temperature sensing probe, so as to ensure the constant oil temperature.
The heat exchanger adopts high-efficiency heat exchange element-vortex hot film tube, which keeps the oil flowing between tubes reasonably, and the thermal efficiency is 3-5 times that of ordinary heat exchanger. Its heat transfer enhancement mechanism is that the oil fluid is designed as turbulent flow when it flows on the inner and outer surfaces, which produces strong shock and scouring effect, and the direction of flow is constantly changing. The high-temperature oil fluid close to the surface of the tube is constantly replaced, the thermal insulation layer is thinned and even destroyed, the heat transfer on the metal surface is accelerated, and the micro-vortex of the fluid is strengthened, so that. The fluid close to the pipe wall surface will not be overheated at local high temperature, so the oil can be properly and fully heated without the possibility of coking and decomposition. Good heat transfer without great resistance.
heating characteristics:
1. Fast heating speed, high heat transfer efficiency and no easy scaling.
2. Oil can be heated quantitatively, as much as needed.
3. The oil will not appear local high temperature and carbonization, which ensures the oil quality and the heat transfer efficiency of the heater.
4. The temperature of the oil outlet in the oil tank is the highest, which ensures the fluidity of the poured oil.
5. Repeated heating of the oil in the tank is avoided, which ensures the chromaticity of the oil and reduces the cost of oil treatment.
6, long service life, corrosion resistance, high temperature resistance, high pressure resistance, anti-scaling function, greatly improving the overall performance of the heat exchanger.
7. The design of process structure is advanced, which ensures the smooth outflow of oil products and better "bottom pumping" effect.
8. Automatic control can be realized, and the steam feed can be controlled according to the inlet and outlet temperature of the oil product and the pour flow.
9. Compact structure, convenient installation and maintenance, and the safety of the tank body will not be affected by the installation of the heater. Compared with the U-tube heat exchanger, under the same heat exchange area, the external dimension of the vortex hot film heat exchanger is only about half of that of the U-tube heat exchanger.
1. Compared with the electric heating method, it is safer, the heating is milder and has less influence on the oil quality.
It is reported that this new oil tank heating technology has won many national patents and has been applied in many oil and gas storage and transportation units of PetroChina.
comparison between the new oil tank heating technology and the traditional tubular heat exchange technology: heating mode, oil output of heat medium, heating temperature, heating time, condensate temperature, steam consumption of tubular heat exchanger, .8Mpa saturated steam, 6t/t 3℃-6℃, 14 hours and 3 minutes, 1℃, 14.6t oil tank local rapid heater, .8Mpa saturated steam, 6t/t 3℃-6℃, 1 hour and 3 minutes, 55℃, 1.96t.