Processing of the tube sheet in the double-tube-sheet titanium heat exchanger

In the chemical industry, titanium heat exchangers are commonly used as the equipment for achieving heat exchange between materials. According to the survey, the frequency of using heat exchangers accounts for 40% of the total chemical equipment usage. Among them, the double-tube plate heat exchanger is widely used. During the manufacturing process, if we only use single-tube plate heat exchangers, it will not be able to ensure that there is a small amount of leakage of the two media in the tube section and the shell section. Small leakage mixing may cause the materials to be scrapped or lead to major accidents. At this time, a double-tube plate structure must be adopted. This structure can effectively prevent the mixture of the two materials, thereby reducing the probability of safety accidents.

Next, let's talk about the processing of the titanium heat exchanger tube plates: Br> During the manufacturing and processing of the tube sheet, it is essential to strictly control the assembly accuracy between the tube sheet and the heat exchanger, as there is a gap between the two tubes. If there are errors between the tube bridges or deviations in the tube holes, and the verticality exceeds the specified range, then after replacing and inserting the tubes, deformation will occur, thereby reducing the thermal conductivity of the expansion joint. If there are errors between the tube bridges or tube holes, and the verticality exceeds the specified limit, then after replacing and inserting the tubes, deformation will occur, and subsequently, the thermal conductivity of the expansion tube will decrease. Br>Br> To ensure the concentricity and verticality of the two tube plates of the titanium heat exchanger, it is necessary to consider using a CNC drilling machine to drill the base holes. According to the manufacturing process, the verticality tolerance of the sealing surface of the tube plates to the axis and the verticality tolerance of the tube holes to the sealing surface of the tube plates should be controlled. The size of the hole bridge should be strictly controlled. The surface roughness value of the inner and outer tube holes should be ≤ 12.5m. No longitudinal or spiral-shaped cracks that affect the tightness of the expansion connection should exist on the surface of the inner and outer tube holes. The two groups of tube plates should be stacked separately in the drilling direction, and the concentricity should be found by pre-pushing through the holes one by one with the expansion tubes.