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Applications / Chemicals

Green Hydrogen for Chemicals and Storage

In one paragraph: when hydrogen feeds a chemical process rather than an instrument, the specification driver changes. Purity is defined by your catalyst’s tolerance, pressure is defined at the battery limit of the consuming process, and turndown is defined by the offtake contract — not by what the electrolyzer finds convenient. Those three figures decide the scope, and none of them can be read off a standard product table.
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Duty & Scale
High-capacity PEM electrolyzer system for chemical feedstock and plant-scale hydrogen production
Reference configuration shown. Supplied equipment and appearance depend on the approved specification.
Project scope

Define the hydrogen supply boundary

The 0.5–200 Nm³/h portfolio can be reviewed for a defined hydrogen demand. Do not interpret an output band as the capacity of a complete methanol or ammonia plant; identify whether the request concerns pilot work, supplemental feed or a standalone process.
01 · Generation
PEM hydrogen production and agreed gas treatment.
02 · Compression
Match pressure to the storage or process inlet.
03 · Buffer / storage
Separate vessel selection, usable capacity and controls.
04 · Chemical process
Catalyst limits, process equipment and plant operation remain explicit scope items.
Synthesis reactors, storage vessels and site permits are not implied by the electrolyzer supply. Renewable electricity and its assessment boundary must be specified before using a green-hydrogen claim. Reference: DOE: hydrogen production by electrolysis.
Purpose & value

Where chemical hydrogen projects go wrong

Most of the cost surprises come from three assumptions made early and corrected late.

Purity taken from a catalogue

A gas grade is not a process specification. Your catalyst has its own tolerance for water, oxygen and sulphur compounds — state the limit at the point of entry and confirm it with the catalyst supplier.

Pressure quoted at the wrong point

Electrolyzer outlet pressure and battery-limit pressure are different numbers. The gap is made up by compression, which is capital, energy and maintenance.

Turndown treated as a setting

If the consuming process stops, the hydrogen has to go somewhere. Storage, an alternative outlet or shutdown capability are scope decisions, not control-loop details.
The practical rule. Write down the three figures first — impurity limit at entry, pressure at the battery limit, and minimum offtake — then let the equipment be selected against them.
Duty & scale

Typical duties and the output class they imply

Reference data for configuration review. The accepted quotation and approved technical specification define the supplied equipment. Confirm process-side limits with your catalyst or process licensor.
Duty Typical output class Dominant specification question
Hydrogenation and fine chemical feed
10–50 Nm³/h
Impurity limit that the catalyst tolerates, and turndown against batch operation
Green methanol synthesis feed
50–200 Nm³/h
Steady output and pressure at the battery limit; behaviour during synthesis turnaround
Green ammonia synthesis feed
50–200 Nm³/h
Continuous availability and how the offtake is protected during electrolyzer maintenance
Storage-coupled operation
By storage capacity
What the electrolyzer does when the storage system stops accepting gas
Blending into existing gas networks
Project specific
Network entry specification and pressure, which is set by the operator not the plant
PEM electrolysis and hydrogen storage demonstration system showing buffer and storage coupling
Electrolysis with storage coupling at demonstration scale. Useful for establishing control logic between the generator, compression and storage before plant scale.
PEM water electrolyzer system for green hydrogen production feeding an industrial process
On-site generation removes the delivered-gas dependency, but it moves the reliability question to the plant — which is why availability is specified, not assumed.
Specification

What to fix before requesting quotations

  • Impurity limit at the process entry point, confirmed with the catalyst supplier
  • Pressure required at the battery limit, not at the electrolyzer outlet
  • Minimum and maximum offtake, and how often they occur
  • What the plant does when the consuming process stops
  • Storage, compression or alternative outlet scope
  • Availability target and the redundancy class it implies
  • Expansion plan, and utilities sized for final capacity from day one
  • Feed water quality available on site and treatment scope
  • Cooling medium, ambient conditions and electrical supply
  • Standards, permit requirements and documentation for the site
Related systems

Systems and documentation

PEM electrolyzer systems

Complete systems from compact units to plant scale

200 Nm³/h system

Large-capacity configuration for synthesis-scale feed

50 Nm³/h system

Process-scale output for chemical and industrial use

Electrolysis & storage demonstration

Establish control logic between generation, compression and storage

Renewable energy integration

Coupling the plant to solar or wind generation

Sizing calculator

Convert a gas requirement into power and annual energy

Buyer questions

Questions before specification

What purity does hydrogen for chemical feedstock need?

It depends on the catalyst and the synthesis route rather than on a single industry number. Methanol and ammonia synthesis catalysts have their own tolerance limits for water, oxygen and sulphur compounds. State the limit at the point where the gas enters your process, and confirm it with the catalyst supplier, rather than specifying a purity grade from a gas supplier’s catalogue.
Specify it at the battery limit of the consuming process, not at the electrolyzer outlet. The difference between the two is made up by compression, which is a cost and a maintenance item, so the required figure should be agreed before the configuration is fixed.
Enough to follow the offtake contract without flaring or venting. If the plant must run while the consuming process is down, the specification has to cover storage, compression or an alternative outlet — these are different scopes, not different settings.
Modular configurations allow capacity to be added in steps, but the utility, cooling and gas treatment scope has to be designed for the final capacity from the start. Retrofitting utilities after the first module is in service is usually where expansion plans become expensive.
Compression, buffer capacity, pressure management and the control logic that decides when to fill and when to draw. The storage technology itself is a separate selection; the integration question is how the electrolyzer behaves when the storage system stops accepting gas.
Next step / configuration review

Send us the process requirement and we will review the scope

Tell us the impurity limit at entry, the pressure at the battery limit and the offtake pattern. Include the destination country and any procurement specification so the proposed scope can be reviewed against your project.

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