The chemical equation for ammonia decomposition is as follows.
That is, under standard conditions, the complete decomposition of 1 kilomolar ammonia produces a hydrogen-nitrogen mixture of 44.8Nm and absorbs 11040 kcal of heat. That is, the complete decomposition of 1 kg of liquid ammonia produces 2.64 m3 of hydrogen-nitrogen mixture gas, which according to the chemical equation consists of 75% H2, and 25% N2.
The ammonia decomposition hydrogen production unit is a combination unit carefully designed and manufactured according to the basic principle of ammonia gas decomposition reaction.
Ammonia decomposition in industrial equipment conditions can not be 100% complete decomposition, there are trace amounts of residual ammonia, industrial liquid ammonia contains a small amount of water, with the use of gas purifier, can be removed from the mixture of residual ammonia and water, to obtain satisfactory protection gas, to meet the needs of industrial production (such as the impurity of oxygen has high requirements, can also be added to the purifier oxygen removal device).
The most economical way to reduce the protective atmosphere is to use the mixed atmosphere of the product gas directly as a protective atmosphere, where hydrogen is required. It can also be used as a hydrogen-rich feed gas to extract pure hydrogen, which is an economical way to produce hydrogen.
Ammonia decomposition equipment has the following characteristics.
Liquid ammonia self liquid ammonia storage tank advanced intermediate tank, intermediate tank plays the role of storage, heat transfer, vaporization, drainage, etc., can make full use of the thermal efficiency, but also can stabilize the working pressure of the system. The decomposition furnace absorbs the unique features of the Austrian EBNER products in terms of construction and material. The structure adopts the integral cracking furnace tube and the cylinder plum pile structure (to make the airflow in all parts of the furnace chamber uniform and the service life uniform; with the structure of the external hanging wire to maximize the thermal efficiency).
In terms of material.
1, the furnace pipe material adopts high temperature heat-resistant steel Cr25Ni20, the heating element adopts nickel chromium alloy Cr20Ni80 with excellent mechanical properties at high temperature, and the surface load of the heating element is determined within a reasonable range. 2, the core insulation material aluminum silicate fiber adopts the method of vacuum absorption and filtration of the advanced insulation material of the Luo Naiyuan molding and surface more than five times to strengthen, can make the furnace wall temperature rise control in less than or equal to 40 ℃. So that the insulation material has a lightweight and high-strength structure, unique structure determines the heat transfer coefficient of the material is 15% lower than similar products, coupled with dual temperature control, high and low voltage alarm system, as well as excellent performance of the valve and other components to build our company ammonia decomposition in the long-term competition has been in the lead.
The furnace temperature is controlled by an over-zero trigger silicon control to ensure a constant furnace temperature. Make the gas ammonia break down better at a constant temperature.
The furnace chamber is made of heat-resistant steel and has a plum-shaped column structure. Ensures complete decomposition of gaseous ammonia and a long service life in a high temperature and corrosive environment.
In terms of purifier, it is more characteristic: the dryer adopts the structure of inner cylinder heating airflow, which avoids the local overheating of the heating element and makes the molecular sieve in the dryer heated evenly, and at the same time, it has two effects of airflow medium and cylinder wall to heat the molecular sieve bed, and the temperature gradient is strictly controlled within the process range, which minimizes the energy consumption.
Ammonia decomposition and purification unit
The purification unit uses the large specific surface area and polar adsorption of the 5A molecular sieve to achieve deep adsorption of water and residual ammonia. The decomposed nitrogen-hydrogen mixture enters the dryer to remove residual moisture and other impurities. The purification unit adopts a double adsorption tower process, one adsorbs dry ammonia decomposition gas and the other desorbs the water and residual ammonia under heating (generally at 300-350℃), thus achieving the purpose of regeneration. The adsorption tower adopts the inner and outer cylinder structure, which avoids the overheating sintering of the molecular sieve and ensures the service life of the molecular sieve. The valves are of high quality, with reliable sealing and no internal leakage to ensure the purity of the product gas.
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