Titanium plate fixed tube sheet heat exchanger design

With the continuous development and equipment manufacturing increasing levels of chemical production, due to the titanium corrosion resistance, high strength, and titanium surface is not easy to scale, etc., titanium fixed tube plate heat exchanger applications increasingly more widely. Titanium plate fixed tube heat exchanger design and carbon steel or stainless steel fixed tube sheet heat exchanger design is there is a difference.
In the design of titanium heat exchanger before, we must first understand the performance characteristics of Titanium Sheet under. Commercially pure titanium and titanium alloys can be welded between themselves or each other, but not with other metals welding; thermal conductivity of titanium is small, high melting point, the melting of titanium with greater mobility, therefore, blunt its welded joints side gap is smaller than the other metals; titanium poor impact toughness and fracture resistance, and thus to maintain the connection in the design and structure of the weldability is poor, so that in the design of the cartridge to maintain connectivity smooth weld structure, as far as possible avoid stress concentration; drilling and tapping titanium is difficult, therefore, should be designed to avoid too long a blind hole or through hole, and avoid as much as possible than tapping on the device; titanium sensitive to the gap higher, in the design of parts, the surface must be smooth, does not allow the presence of scratches and other surface defects, must be penetration weld butt joint, the surface should be smooth; titanium narrow range of plastic deformation, and a clear work hardening, so bending and flanging titanium parts usually large bending radius (bending radius not less than 4-5 times the thickness), with a smaller rate when expanding expanding.
For critical selection process titanium heat exchanger, carbon steel and stainless steel heat exchanger shell side Regardless of corrosive media or take the tube to affect the entire manufacturing difficulties and costs are not too large. But for the titanium heat exchanger is not the same, in general, try to let go tube corrosive media, so we can use the tube plate titanium tube titanium composite board or liner board, while the shell can be used carbon steel or stainless steel. not only reduces the titanium material consumption, cost savings, but also reduces the production of the difficulty.