When using spiral plate heat exchangers in chemical production, the processes taking place in stainless steel reactors are not only chemical reactions, but also involve physical transfer processes such as fluid flow, heat transfer of materials, and mixing. Within the reactor, the steps and rates of chemical reactions are governed by the laws of chemical kinetics. For gas-liquid reactions, for example, the reaction rate is not only related to temperature and concentration, but also to the size of the interface and the diffusion rate between phases
Spiral plate heat exchangers are widely used. In China, the shift heat exchangers and heat exchangers at the bottom of synthesis towers in small and medium-sized synthetic ammonia plants have been successively replaced by spiral plate heat exchangers instead of shell-and-tube heat exchangers. The equipment cost of using spiral plate heat exchangers for electrolyte heaters and concentrated alkali coolers in caustic soda plants is only one-third of that of shell-and-tube heat exchangers. In addition, this type of heat exchanger has good effects in tower top condensation, quenching oil cooling, fuming sulfuric acid cooling, and fatty acid cooling. This equipment has good effects in steam condensation and convective heat transfer without phase change, and can also be used for boiling heat transfer
Entering the emulsion system for cooling and lubricating the rolling mill can damage the circulating equipment and shorten the lifespan of the emulsion; it also damages the cold rolling mill, which has high surface smoothness and processing accuracy and is expensive. Therefore, before cold rolling, the surface oxide scale of the strip steel must be removed to ensure the surface quality of the produced cold rolled strip steel. Acid pickling is a very important process in the production of cold rolled strip steel, and its purpose is to remove the oxide scale through chemical reaction between the acid solution and the oxide scale