The length of the channel of the shell medium is extended, the flow rate between tubes is increased, the degree of turbulence is increased, and the heat transfer effect of the heat exchanger is improved.

It has a certain supporting effect on the heat exchange tube. Reducing the distance between the baffle plates can alleviate the stress of the heat exchange tube and prevent the vibration induced by fluid flow.

The baffle is conducive to the installation of the heat exchange tube.

The height of the baffle bow notch should be similar to the flow velocity of the fluid when passing through the notch and the transverse flow through the tube bundle, and the notch height h should be 0.2~0 of the nominal diameter of the shell. 45, often take h=0.2Di. The baffles should generally be arranged at equal intervals, the baffles at both ends of the tube bundle should be as close as possible to the inlet and outlet of the shell, the minimum spacing of the baffles should not be less than 1/5 of the inner diameter of the cylinder, and not less than 50mm, and the maximum spacing should not be greater than the inner diameter of the cylinder.

The arrangement of the bow baffle is also very important, in the horizontal heat exchanger, the notch of the baffle plate should be arranged horizontally above and below, if the shell fluid is gas, and contains a small amount of liquid, the liquid port should be opened at the lowest part of the baffle with the notch facing upward, so as to drain the liquid. If the shell fluid is liquid and contains a small amount of gas, the port should be opened at the highest point of the baffle with the notch facing downward. When the shell medium is the coexistence of gas and liquid or the liquid contains solid materials, the baffle plate should be vertically distributed on the left and right, and the liquid port should be opened at the lowest part of the baffle.

The baffle plate is fixed by a tie rod and a fixed distance pipe, the thread at one end of the tie rod is screwed into the tube sheet, the baffle plate is positioned with a fixed distance pipe, and the last baffle plate is fixed by the tie rod end nut.

The circular baffle is blanked in a full circle

When the diameter is > 1800mm, the baffle plate can be formed by tailored welding, and the baffle should not have a wrong edge when welding and splicing, and the weld is ground and the baffle is cut by CNC cutting machine, including the opening of the slideway groove and the ventilation (liquid) tank

After the baffle plate is discharged, burrs, oxide scale, etc. should be removed, and leveled, and its surface unevenness should be <0.5%× outer diameter; The baffle plate of the same product is stacked (the notch direction is the same) along the periphery grouped spot welded together, the stacking height should be less than 4/5 of the length of the drill bit, generally 50~70mm, the thickness of the baffle plate of a single product is small after lamination, and the baffle plate of the same specification can be stacked and spot-welded together

The baffle spot welding must be tightly compressed, the end face is perpendicular to the plane, and the non-perpendicularity is 43mm. The end gap of each baffle plate is <0.2mm, and the total thickness difference is <2mm;

According to the requirements, the surface roughness of the pipe hole should not be greater than 25μm when the CNC drilling machine is used

For steel pipe bundles, 100% inspection should be carried out when the requirements are not met, the pipe holes should be chamfered according to the requirements of the drawing, and the burrs at the end of the holes should be polished with a grinding wheel when the drawings are not required

After the hole is drilled, the hole is used as the reference, and then the tie rod hole is drilled by marking

Use a special clamp to clamp the outer circle of the baffle car

The roughness of the machining surface should not be greater than 25μm, the sharp corners of the outer circle should be blunt, remove the burrs on the baffle after the machining of the bow baffle is completed, mark the direction, and then draw the line, cut off the excess part, and the drilling position should not be changed when assembling, so as to ensure the coaxiality of several baffle tube holes.

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