Working principle T-type finned tube, heat exchanger is a kind of high-efficiency heat exchanger which is formed by the rolling process of the smooth tube. The structure is characterized in that a series of t-shaped spiral ring tunnels are formed on the external surface of the tube. When the medium outside the tube is heated, a series of bubble nuclei are formed in the tunnel. Because the bubble nuclei are heated around the tunnel cavity, the bubble nuclei expand rapidly and fill the inner cavity, causes the bubble to spurt rapidly from the surface slit of the tube. When the bubble is ejected, it has a large scouring force and produces a certain amount of local negative pressure, which makes the surrounding lower temperature liquid rush into the T-type tunnel and form a continuous boiling. This kind of boiling method takes away much more heat per unit surface area than smooth tube in unit time, so this type of tube has higher boiling heat transfer ability.

2. Characteristics (1) good heat transfer effect. In R113 Medium, the boiling heat transfer coefficient of T tube is 1.6-3.3 times higher than that of smooth tube. (2) only when the temperature of the heat medium is higher than the boiling point of the cold medium or the bubble point is 12 ° C-15 ° C, the cold medium will bubble and boil. The T-type finned tube heat exchanger only needs 2 ° C-4 ° C temperature difference, and the cold medium can boil, and the bubble is fine, continuous and fast, which forms the unique advantage compared with the smooth tube. (3) the single tube experiment with Freon-11 as medium shows that the boiling heat transfer coefficient of t-tube is 10 times of that of light tube, and the total heat transfer coefficient of small tube bundle experiment with liquid ammonia as medium is 2.2 times of that of light tube The commercial calibration of reboiler for C 3 and C 4 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. (4) it is cheaper than aluminum porous surface heat transfer tube. (5) because the gas-liquid disturbance in the tunnel is very intense and the gas is spewed out along the t-slot at high speed, it is not easy to form scale in the T-groove or on the outside surface of the tube, this ensures that the equipment can be used for a long time and the heat transfer effect will not be affected by scaling. 3. T-type finned tube can be used as heat exchange element to form T-type finned tube high efficiency heat exchanger as long as the shell side medium is clean, no solid particles and no colloid, in order to improve the shell side boiling heat transfer effect.