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Another hydrogen production method is steam reforming, which is actively used at large oil refineries, as well as for technological processes in gas chemistry, metallurgy and other industries. Steam reforming makes it possible to produce pure hydrogen using light hydrocarbon feedstock. Such units capacity starts from 150 m³/hour.
Compared to water electrolysis, gas vapour reforming method allows to produce more hydrogen with less energy consumption. At the same time, this technology requires complex technological equipment and is rather energy-consuming. This technology application is justified from the prime cost point of view only if there is a large amount of raw materials and electric power. Hydrogen production by steam methane reforming is the least expensive and most frequently used method of hydrogen production. In this process, easily available and inexpensive methane and water react in the presence of a catalyst.
Hydrogen production by steam reforming technology is based on mixing natural gas with steam and then heating this mixture to high temperatures (700° C – 1000° C) under pressure in presence of a catalyst. This produces carbon monoxide, hydrogen and a small amount of carbon dioxide. Next, the carbon monoxide from the reforming reaction interacts with steam, again using a catalyst, to produce additional hydrogen. Finally, the carbon dioxide is removed, leaving pure hydrogen. Throughout the whole process, heat from gas fuel combustion in a furnace box is transferred to catalyst tubes by radiation.
1. Demand | Nm³/hour | from 150 |
2. H2 purity | % vol. | up to 99,999 (up to 10 ppm) |
3. Output pressure | bar (ex.) | up to 35 |
4. Gas dew point | °С | up to -70 |
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