What is ammonia decomposition for hydrogen production ?
Hydrogen is a good protective gas, which is widely used in industrial and scientific research, such as bright annealing of metal materials and parts such as non-ferrous metals, silicon steel, chromium steel and stainless steel, decarburization treatment of silicon steel sheet, sintering of copper-based and iron-based powder metallurgy, hydrogen burning treatment of metal parts of electric vacuum devices, protective sintering and sealing of semiconductor devices. Ammonia decomposition to produce hydrogen is a chemical reaction, which means that liquid ammonia is heated to 800 ~ 850 °C, and ammonia is decomposed under the action of nickel-based catalyst to obtain a hydrogen-nitrogen mixed gas containing 75 % H2 and 25 % N2.
Ammonia decomposition hydrogen production uses liquid ammonia as raw material. After gasification, the ammonia gas is heated to a certain temperature in the ammonia decomposition furnace ( cracking furnace ). Under the action of the catalyst, ammonia is decomposed to produce a mixture of hydrogen ( 75 % ) and nitrogen ( 25 % ). The gas is purified by a heat exchanger and a cooler, and then purified by a molecular sieve adsorption purifier. Its advantage is that the raw material ammonia is easy to obtain, the price is low, the raw material consumption is less, and the ammonia cracking to prepare the protective gas has less investment, small volume, and high efficiency.
Since the hydrogen [ compressed ] and ammonia ( liquid ammonia ) involved 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. Therefore, ammonia decomposition to produce hydrogen has high safety risks. It is necessary to strengthen the analysis of dangerous and harmful factors and accident prevention and control to prevent the occurrence of various accidents.
There are major dangerous and harmful factors such as fire, explosion, poisoning, suffocation and burning in the process of ammonia decomposition hydrogen production, which are easy to cause group injury accidents. By adopting three measures of safety technology, safety management and safety training, the accident risk can be effectively controlled to ensure the safety of ammonia decomposition hydrogen production.