Hydrogen is a good maintenance gas, widely used in bright annealing of non-ferrous metals, silicon steel, chromium steel and stainless steel and other metal materials and parts, decarburization treatment of silicon steel sheet, copper-based, iron-based powder metallurgy sintering , Hydrogen treatment of metal parts of electric vacuum equipment, maintenance of semiconductor equipment, sintering and sealing, etc., in industry and scientific research that require a maintenance atmosphere.

　　 Ammonia decomposition hydrogen production uses liquid ammonia as the material. After gasification, the ammonia gas is heated to a certain temperature in the ammonia differentiation furnace (cracking furnace). Under the effect of the catalyst, the ammonia differentiation produces hydrogen (75%) and nitrogen ( 25%) of the mixed gas, the gas is purified by a heat exchanger and a cooler, and then purified by a molecular sieve adsorption purifier. Its advantages are that the raw material ammonia is easy to obtain, the price is low, and the raw material consumption is less. The ammonia cracking to produce the maintenance gas has low investment, small size, and high power.

　　 Because the hydrogen [compressed] and ammonia (liquid ammonia) touched in the production process are flammable and explosive, and ammonia is a toxic gas, the process conditions are carried out under high temperature and pressure, so the ammonia decomposition system Hydrogen has a high safety risk. It is necessary to strengthen the analysis of risk and harmful elements and the prevention and control of incidents to eliminate all kinds of incidents.