Ammonia (gaseous) is cracked into 75% hydrogen and 25% nitrogen under the action of a catalyst (Southwest Institute Z204) at a certain temperature, and absorbs 21.9 kcal of heat. The main reactions are:
2NH3-3H2+N2-21.9 kcal, the whole process is an endothermic expansion reaction, increasing the temperature is conducive to ammonia cracking, and at the same time it is a volume expansion reaction, reducing pressure is conducive to the decomposition of ammonia, ammonia decomposition hydrogen production equipment is the most suitable for use. in good condition.
The working principle of hydrogen purification
1. When the hydrogen produced by the ammonia decomposition hydrogen production equipment is qualified, it will enter the hydrogen purification for further purification treatment. The purity of the cracked hydrogen is very high, and the volatile impurities are only a trace amount of residual ammonia and water. It can be seen that only a trace amount of residual ammonia needs to be removed. and moisture to obtain high-purity gas.
2. Gas purification adopts temperature swing adsorption technology. Temperature swing adsorption (TSA) technology is a gas separation and purification process based on the different adsorption properties of gas molecules on the inner surface of the adsorbent (porous solid substance) at different temperatures. The impurity gas is adsorbed at room temperature and desorbed when heated. ,
3. The surface of the molecular sieve is full of micropores, which can absorb 20% of its own weight at normal temperature and pressure (water and impurities during static adsorption, but at a temperature of about 350 °C, it can be completely regenerated, and it can be switched every 24 hours. In order to obtain the product gas with qualified purity and impurity content.

First. Ammonia decomposition hydrogen production process
1. Using liquid ammonia as raw material, after ammonia is cracked, 2.64Nm of mixed gas can be obtained per kilogram of liquid ammonia cracking, which contains 75% hydrogen and 25% nitrogen. The obtained gas contains less impurities (the water vapor in the impurities is about 2 g/m3, and the residual ammonia is about 1000ppm). After passing through the molecular sieve (UOP) adsorption purifier, the dew point of the gas can be reduced to below -60C, and the residual ammonia can be reduced. to below 3PPM.
2. Ammonia cracking hydrogen production furnace can be used for bright annealing of non-ferrous metals, silicon steel, chromium steel and stainless steel and other metal materials and parts, decarburization treatment of silicon steel sheets, copper-based, iron-based powder metallurgy sintering, and metal parts sintering of electric vacuum devices Hydrogen treatment, protective sintering and sealing of semiconductor devices, raw material gas for hydrogen purification by diffusion of palladium alloy membrane, etc.
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