Wood improvement installation in which, through a chemical process, normal wood is drastically preserved.
In this process, nitrogen must be heated. This is done by a gas heater, where the gas is heated by condensing steam.
In this installation, normal wood is made so durable that its properties correspond to the best qualities of hardwood. The wood is treated with acetic acid and anhydrides. For this, among other things, a large amount of nitrogen must be heated. The pressure loss must not be too large for the installation to work properly. That is why ROBOX has calculated an X-shell in which the nitrogen flow enters transversely of the hull and immediately leaves the hull on the other side. The heater is more than 13 meters long and on each side there are 8 DN500 nozzles. In the center of the hull is a compact bundle in which steam condenses. This ensures that the nitrogen heats up. Due to this construction, the pressure loss is less than 20 mbar. ROBOX was involved in the design of this installation at an early stage and was therefore able to contribute to the optimization. Other heat exchangers were also designed and built for the same installation. These were feed heaters, recycle flow condensers, steam condensers and condensate coolers.
The external heater is a Shell & Tube heat exchangers. A cross-flow shell with U-bundle and removable cover. TEMA type BXU 800 / 11800. Entirely in stainless steel according to PED cat.IV / Mod.G and ASME VIII Div.1