T-shaped finned tube|Low fin tube

1. Principle of T-shaped finned tube:

T-shaped finned tube is a kind of high efficient heat exchange tube, which is formed by rolling the plain tube. The structure of T-shaped finned tube is characterized by forming a series of spiral annular T-shaped tunnels on the outer surface of the tube. When the medium outside the tube is heated, a series of bubble nuclei are formed in the tunnel. As the tunnel cavity is heated around, the bubble nucleus expands rapidly and fills the inner cavity. Continuous heating increases the pressure inside the bubble rapidly, prompting the bubble to eject rapidly from the slit on the tube surface. When bubbles are ejected, they have a large scouring force site and generate a certain local negative pressure, which makes the surrounding liquid with lower temperature flow into the T-shaped tunnel and form continuous boiling. In unit time, the heat taken away by unit surface area r} is much greater than that of bare tube, so this tube type has a higher boiling heat transfer capacity.

2. Characteristics of T-shaped finned tube:

T-shaped finned tube has good heat transfer effect. The boiling heat transfer coefficient of T tube in R113 medium is 1.6 times to 3.3 times higher than that of smooth tube. For conventional bare tube heat exchanger, only when the temperature of the hot medium is higher than the boiling point or bubble point of the cold medium by 12 ℃ – 15 ℃, the cold medium will bubble and boil. The T-type finned tube heat exchanger only needs a temperature difference of 2 ℃ – 4 ℃, and the cold medium can boil, and the bubble is fine, continuous and fast, forming a unique advantage compared with the smooth tube.

The single tube experiment with Freon 11 as the medium shows that the boiling heat transfer coefficient of T-tube can reach 10 times of that of bare tube, and the total heat transfer coefficient of small tube bundle experiment with liquid ammonia as the medium is 2.2 times of that of bare tube; The industrial calibration of reboiler of C3 and C4 hydrocarbon separation tower shows that the total heat transfer coefficient of T-tube is 50% higher than that of smooth tube at low load and 99% higher at high load.

T-shaped finned tube is cheaper than aluminum porous surface heat transfer tube.

As the gas-liquid disturbance inside the T-shaped finned tube tunnel is very intense and the gas is ejected at a high speed along the T-shaped slot, scaling is not easy to form inside the T-shaped slot or on the outer surface of the tube, which ensures that the equipment can be used for a long time without the heat transfer effect being affected by scaling.

3. Specification of T-shaped finned tube:

16 FINS / INCH   FIN PITCH M = 1.59mm

19 FINS / INCH   FIN PITCH M = 1.33mm

26 FINS / INCH   FIN PITCH M = 0.97mm

4. T-shaped finned tube material:

5. Applicable scope of T-shaped finned tube:

As long as the shell side medium is clean, free of solid particles and gums, T-shaped finned tubes can be used as heat exchange elements to form T-shaped finned tube high efficiency heat exchanger to improve the boiling heat transfer effect at the shell side. T-shaped finned tube is applicable to the working conditions of shell side boiling heat transfer in petrochemical, energy and other industrial fields. It is not applicable to the medium with solid dust and easy coking in the shell.