High-frequency finned tube has the following six advantages:

1, integral fin tube can expand heat transfer effect (area and heat transfer coefficient). With the same base tube case:(in the tube

With 32X4 as an example, wing height 12, wing distance 12) 1 meter is equivalent to: 4 meters light tube or 2.6 meters membrane structure (spacing 62X3, flat steel 30X3) or 1.5 meters flat steel winding welded fin tube (flat steel 12X3).

2、Integral fin tube wear resistance. Because of the integral type of fin

Uniform crystal structure,

Stable performance, besides fin is in the shape of the sand dunes and when heated temperature gradient in shape, outside when heated fin surface temperature, the thermal stress evenly, won't produce concentrated, also won't produce strength weak spot, (and the wear of the main reason is that high temperature point, should be low sigma), in addition, the fin on the diversion effects of flue gas, the diversion of at the same time, make each index of the flue gas (temperature, flow rate, ash content, etc.) more evenly, won't produce flue gas flow deviation, also won't cause gas concentration scouring an area or a particular part. So it's more resistant. And usually light tube in the radial about 30°, end elbow, side wall tube and other parts are serious wear.

3、Integral fin tube stiffness is greatly enhanced. The stiffness depends on the moment of inertia. The moment of inertia of the whole finned tube is 4.76 times that of the corresponding light tube. (phi 32X4 moment of inertia 35168mm?) And the moment of inertia of finned tube is 167613mm? ) the light tube with bracket spacing is 2.71m(3.55m old tube gauge), and the fin tube is 5.28m (6.91m old tube gauge). If the calculated wall temperature reaches around 460°, the bracket spacing will be reduced, so some users may break several rows of pipes on the superior saver between the two supports. The occurrence of this phenomenon is fracture integrity. And the material did not find a problem.

4、Integral fin tube does not accumulate ash. The cause of the ash accumulation is kamen's vortex: as the gas flows through the pipe, it forms a negative pressure zone on the back of the pipe, where it accumulates at zero velocity or even returns. The heat resistance of ash is relatively large, the ash is thicker and thicker, the heat resistance is larger and larger, the heat transfer is less and less, the smoke exhaust temperature increases, the efficiency of the boiler also decreased. The finned tube guides the flue gas to overcome the karman vortex and comb the ash distribution so that it can be distributed evenly in the flue gas. Huaru hengsheng group has not accumulated ash since its operation (there is no dust blowing facility), which is also confirmed by the experimental report conducted by xjtu.

5、Stable heat transfer performance. As the heating surface, the boiler smoke exhaust temperature fluctuates little under the operating conditions of many years (without blowing ash), and there is no explosion of the economizer tube.

6、Long service life. Under the same operating conditions (coal quality, temperature, location of heating surface), the finned tube is guaranteed to have a longer life than the light tube by 2 times. Under normal circumstances, the light tube life 3~4 years, the fin tube life at least 7~8 years. For the expected 240t/h boiler structure layout,