Pressure swing adsorption for hydrogen production is based on the physical adsorption of gas molecules on the internal surface of the adsorbent (porous solid material). By utilizing the characteristics of the adsorbent, which is easy to adsorb high boiling point components, difficult to adsorb low boiling point components, and has an increased adsorption capacity under high pressure (adsorption part) and a decreased adsorption capacity under reduced pressure (desorption part), the feed gas is passed through the adsorbent bed under pressure. The high boiling point impurity components relative to hydrogen are selectively adsorbed, while the low boiling point component hydrogen is difficult to adsorb and passes through the adsorbent bed to achieve the separation of hydrogen and impurity composition. Then, under reduced pressure, the adsorbed impurity components are desorbed to regenerate the adsorbent, facilitating further adsorption and separation of impurities.
Pressure swing adsorption hydrogen extraction unit
For users with a variety of hydrogen-rich gas resources from oil refining, steelmaking or other chemical processes, direct recovery and purification of hydrogen from these rich gases using pressure swing adsorption (PSA) process will be the simplest and most economical technical solution.
Applicable raw materials: medium and low temperature conversion gas, chlorosilane tail gas, methanol cracking gas, reforming hydrogen, alkane dehydrogenation tail gas, styrene tail gas, methanol run-off gas, refinery hydrogenation low gas, gas, membrane separation gas, catalytic dry gas and other hydrogen-containing gases.
The four adsorption towers of this device alternate between adsorption and desorption preparation processes to achieve continuous production of hydrogen gas. During the process of adsorption desorption, a portion of high-purity oxygen is still retained in the tower after adsorption. This high-purity oxygen is used to evenly pressurize and flush the other two towers that have just been desorbed. The qualified ammonia decomposition gas is subjected to a pressure swing adsorption system with alternating operation of the adsorption tower, which adsorbs and separates all impurities at once to obtain high-purity finished hydrogen gas with qualified purity and impurity content.
Main process steps of Pressure swing adsorption hydrogen production unit:
The first step: liquid ammonia raw materials through high temperature gasification into ammonia gas
Step 2: The ammonia purification unit is used to remove the water and residual ammonia
The third step: The decomposed hydrogen is increased by PSA process
Product features:
Simple principle, compact structure, small footprint, and easy operation;
Low investment, low energy consumption, and low operating costs;
Widely applicable, meeting the needs of most hydrogen usage;
Optimization design of core components such as furnace body, furnace core, and electric heating wire, with a three-year warranty under normal operating conditions;
Application of ammonia decomposition hydrogen production unit
- The protective gas used in the bright annealing of materials such as black, colored, and mechanical industries, including plates, strips, wire coils, pipes, and standard parts.
- Applied in sintering processes of powder metallurgy, tungsten molybdenum materials, hard alloys, electronic materials, etc.
- Applied to tin bath protection gas in float glass production.
- Applied to sintering high-temperature refractory materials.
- Applied as reducing gas in the chemical industry.
Technical indicators:
● Raw ammonia gas:
● Pressure -~0.5bar
Dew point – ≤ -10 ℃
Product decomposition gas:
● Pressure -~0.5bar
Dew point – ≤ -10 ℃
Residual ammonia – ≤ 0.1%
Decomposition gas volume -5-500Nm3/h