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one. Brief description of ammonia decomposition equipment process:

    Using liquid ammonia as raw material, after ammonia is cracked, 2.64Nm3 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 -600C, and the residual ammonia can be reduced. to below 3PPM.

    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, hydrogen burning treatment of metal parts of electric vacuum devices , Protection sintering and sealing of semiconductor devices, raw material gas for palladium alloy membrane diffusion and purification of hydrogen, etc.

    The raw material ammonia is easy to obtain, the price is low, and the raw material consumption is less. Ammonia cracking to produce protective gas has the advantages of low investment, small volume and high efficiency

two. The working principle of ammonia decomposition equipment:

    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 reaction is:

    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 the pressure is conducive to the decomposition of ammonia, and the ammonia decomposition equipment is in the best state of use.

three. How hydrogen purification works:

    When the hydrogen produced by the ammonia decomposition equipment is qualified, it enters into hydrogen purification for further purification. The purity of the cracked hydrogen is very high, and the volatile impurities are only traces of residual ammonia and water. It can be seen that only traces of residual ammonia and water need to be removed. High purity gas can be obtained.

    Gas purification adopts temperature swing adsorption technology. Temperature swing adsorption (TSA) technology is a gas separation and purification process based on the adsorption performance of gas molecules on the inner surface of the adsorbent (porous solid substance) at different temperatures. Impurity gas is adsorbed at room temperature, and impurity gas is desorbed when heated. ,

    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, and can be completely regenerated at a temperature of about 350 °C, switching every 24 hours to get Product gas with acceptable purity and impurity content.