Novel liquid ammonia evaporator

A novel evaporator for liquid ammonia is characterized in that a shell end and an electric heating end are arranged, the shell end is horizontally arranged and adopts a different-diameter heat exchange shell structure, liquid ammonia evaporation is achieved in a horizontally arranged electric heating mode, the shell end adopts a variable-diameter barrel and a main barrel to be arranged in a matched mode, and a U-shaped heat exchange pipe is arranged below a shell; enough gas rotation space, namely buffer space, is reserved at the upper part of the variable-diameter barrel, so that gas-liquid convection buffer time and space are provided, and the circulation of an internal evaporation process and the safety of a use process are ensured; meanwhile, liquid or impurities carried by the evaporated ammonia gas are removed through the wire mesh demister, liquid drops carried by the gas are controlled, safety is ensured, and the quality of required products is improved. 一种新型液氨用蒸发器，通过设置壳体端和电加热端，且壳体端卧式布设并采用异径换热壳结构，通过卧式