| Hydrogen Production Plants |
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The efficacy of the PSA Hydrogen plants has brought a sea change in the
process to purify and produce hydrogen. Mostly these PSA plants can be
used as stand alone units or as a part of steam reforming Hydrogen
generation plants.
For
example, in a Refining industry a PSA unit has ably replaced the Carbon
dioxide removal unit along with methanator and allows the plant to
produce hydrogen with optimum purity. A PSA Hydrogen plant contains a
Steam Methane Reformer that is followed by High Temperature super
conductors. The PSA unit then purifies the syn gas effluent from the
HTSC. The final product that is got comes with 99. 99% purity. The
offgas stream produced by the PSA unit is used by the steam Methane
reformer as the primary fuel source. The added benefit of purity because
of the PSA units has its benefits in the down stream units. Taking an
example, the optimum purity hydrogen makeup to a hydro heater is able to
lower the recycle flow and reduce the costs of compression.
With the rapid changes in the technology, steam reforming plants that
were originally designed for production capacity of 200 to 100,000 Nm
3/hr
now used for smaller capacity plants. It is now possible with a new type
of reformer to serve ranges as low as 50 to 200 Nm
3/h. And
quite economically too based on steam reforming of natural gas. This
capacity range has open the grounds for supplying small vehicles with
hydrogen. The plants ability for a quick multiple start-up and shut-down
operations has allowed maximum flexibility.
A Skid Mounted Hydrogen plant
Features:
- Process:Steam reforming of metahanol
- Capacity:5nm3/hr
- Produces hydrogen @20 bar pressure
- Purity: Pressure Swing Adsorption (PSA) systems used for
purification of Hydrogen, of up to < 10 ppm Carbon monoxide
- Cost:Economical
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In this Hydrogen production plants, purification is achieved by
means of pressure swing adsorption (PSA). Typically, the PSA unit
consists of four vessels. The vessels are filled with selected
adsorbents. The PSA is able to reach hydrogen purities more than 99.999%
by volume. While bringing down CO impurities of less than 1 vppm
(volumetric part per million). Thus fulfilling the exact specifications
as set by the fuel cell fleet operators. Pure hydrogen thus obtained
from the PSA unit is subsequently sent to the hydrogen compressor. The
PSA off-gas from recovering the adsorbents, known as tailgas, is fed to
the reformer burner. These type of plants are known as the on site Steam
Reforming Plants.
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