H2Tech - Electrolyzer Handbook 2022 - 95

2022 ELECTROLYZER HANDBOOK
PRODUCT CATEGORIES
COMPANY INDEX
PROTON EXCHANGE MEMBRANE (PEM) ELECTROLYZER
EL100N, EL200N, EL400N
DESCRIPTION: H2B2's Modular medium-scale PEM electrolyzers are designed
to fit within standard 40-ft maritime containers for easy handling and transport
and follow a plug-and-play approach for easy and quick onsite installation.
H2B2's arrangement optimizes design from a safety perspective (differentiating
process and support areas), minimizing bulkiness and costs commonly associated
to ATEX characterization.
H2B2's electrolyzers are certified and developed according to European or
American (depending on location) codes and standards. H2B2 supplies electrolyzers
with a CE marking and, if necessary, an ETL stamp, as well as required safety studies
(HAZOP by default).
PROCESS DESCRIPTION:
* Rectifier (AC/DC converter): Required electricity, which can originate from
renewable energy sources, is adapted before powering the stack.
* Water treatment plant (WTP): Which converts the ordinary water into
pure water (2+ type, required for the process). The WTP is only included
if deionized water (Conductivity < 0.1 µS/cm, TOC < 30 ppb) is not available.
WTP could be included as an option.
* Pumps: There are two pumps in the electrolyzer: one to boost the deionized
water that is fed to the stack, and the other one to line up with the
deionization resins.
* Stack: Electricity and water enter the system and water is split into hydrogen
and oxygen molecules.
* Hydrogen separator: Produced hydrogen is a biphasic stream (H2 + H2O),
where steam, hydrogen and traces of oxygen (in gas phase) and liquid
water coexist. Because of this, and due to the hydrogen purity required by
downstream applications, this equipment separates water from hydrogen.
* Purification system: Installed at the outlet of the hydrogen separator,
comprising a dryer (to trap humidity) and a deoxo (a catalytic recombiner
to collect the oxygen), in line with cathode outlet of the stack. A purification
system is only included if the hydrogen purity needed is higher than 99.9%.
A purification system could be included as an option.
* Oxygen separator: Produced oxygen is also a biphasic stream (O2 + H2O),
where oxygen in the gas phase, steam and traces of hydrogen, as well as a
large amount of liquid water, coexist. This equipment recovers the liquid water.
The recovered water is fed again to the stack in a closed loop
(minimizing water consumption).
* Gas cooling system (chiller): To cool the hydrogen stream, improving
the efficiency of the complete system.
Continued 
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H2Tech - Electrolyzer Handbook 2022

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