Spiral plate heat exchangers are widely used. In China, spiral plate heat exchangers have been used to replace shell and tube heat exchangers in the conversion heat exchangers and lower heat exchangers of small and medium-sized synthetic ammonia plants. The equipment cost for 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 on tower top condensation, quenching oil cooling, fuming sulfuric acid cooling, and fatty acid cooling. This device is effective for condensing steam and convective heat transfer without phase change, and can also be used for boiling heat transfer.