Ammonia Decomposition to Hydrogen

Short Description:

Ammonia Decomposition

The hydrogen production of ammonia decomposition takes liquid ammonia as raw material. After vaporization, the mixed gas containing 75% hydrogen and 25% nitrogen is obtained by heating and decomposition with catalyst. Through the pressure swing adsorption, the hydrogen with 99.999% purity can be further produced.


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Ammonia Decomposition

The hydrogen production of ammonia decomposition takes liquid ammonia as raw material. After vaporization, the mixed gas containing 75% hydrogen and 25% nitrogen is obtained by heating and decomposition with catalyst. Through the pressure swing adsorption, the hydrogen with 99.999% purity can be further produced.

Principle of Ammonia Decomposition

Liquid Ammonia Vaporization
The liquid ammonia flowing out of the ammonia bottle enters the ammonia vaporizer firstly. Using water bath heating to vaporization, and the vaporizer is a tube-sheet heat exchanger. Ammonia is supplied to the tube side, and the shell side is hot water heated by the electric heater. The hot water and liquid ammonia exchange heat to vaporize liquid ammonia to gaseous ammonia with 1.5MPa and 45℃. Gaseous ammonia is reduced from 1.5MPa to 0.05Mpa by pressure reducing valve to exchange heat with the high-temperature gas from the decomposition furnace, then the preheated ammonia enter the high-temperature decomposition furnace.

Ammonia Decomposition
The decomposing furnace is composed of electric furnace and decomposing furnace liner. The electric furnace includes electric heating elements, refractory materials, thermal insulation materials, thermistors and electrical temperature control devices. By the way, the electric heating elements nickel chromium alloy Cr20Ni80, which is the best electric heating alloy material. The thermal insulation material is made of popular lightweight aluminum silicate fiber brick.
Decomposition furnace liner is the core part of ammonia decomposition. Ammonia is cracked into hydrogen nitrogen mixture at high temperature with catalyst in the decomposition furnace liner. The furnace liner shall be able to bear the long-term high temperature of 900℃ and the corrosion from ammonia. Therefore, using high temperature resistant alloy as the furnace liner material, and the furnace liner make into U-shape with high nickel catalyst. Ammonia is decomposed into mixed gas containing 75% hydrogen and 25% nitrogen with catalyst under high temperature.
The chemical equation is 2NH3 → 3H2 + N2 - Q

PSA Purification / PSA Hydrogen Production
The mixed gas passes through the heat exchanger and water cooler, then enters the hydrogen purifier for purification. The purification composed of deaerator, cooler, molecular sieve adsorption dryer, valve group and electrical control.
According to the principle of pressure swing adsorption(PSA), there are two molecular sieve adsorption dryers, and the two molecular sieve adsorption dryers are recycled. One is adsorbing impurities and the other is desorbing and discharging impurities.

Process Flow of Ammonia Decomposition

Technical Parameters

Raw Ammonia
Pressure 0.5bar
Dew Point 10
Standard Above the 1st class national standard

Product Hydrogen

Pressure ~0.5bar
Dew Point ≤-10
Remaining Ammonia 0.1%
Hydrogen Flow Rate 1~1000Nm3/h

Features of Ammonia Decomposition

☆ Low cost, energy consumption and investment, small size and high efficiency.
☆ The temperature is controlled by the automatic temperature controller and the flow is regulated by the valve. Therefore, the performance is reliable.
☆ Use high-quality catalyst, heat-resistant stainless steel, nickel chromium alloy electric heating elements and stainless steel valves.
☆ Simple to use and install without capital construction, compact structure and small floor area as an integral skid mounted type.
☆ The gas can be used freely within the rated gas production range with high safety. Generally, there is no need to store hydrogen in the storage tank.


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