Attachment 1 - Technical Specifications - H2 Dryers Equipment Description.pdf

ATTACHMENT 1

Technical Specifications

"Hydrogen Dryer System"

Dated 7/21/2025

OBJECTIVE

This hydrogen dryer system will reduce the concentration of water in hydrogen, produced by water electrolysis, to below 5 parts per million by volume (ppmv) for research at the new Flatirons hydrogen facility per SAE (Society of Automotive Engineers) J2719 and ISO (International Organization for Standardizations)14687. A minimum of two independent dryer units are required that when combined into a system can dry a total flow of hydrogen from a minimum flow rate of 3.75 kg/hr (41.72 Nm3) to a maximum flow rate of 117.6 kg/hr (1308.3 Nm3).

SPECIFICATIONS:

REQUIRED CAPABILITIES

• The hydrogen dryer system shall be designed with the assumption that the incoming fluid is a mixture of pure hydrogen and water (hydrogen produced by proton exchange membrane (PEM) water electrolysis).

• The hydrogen dryer system shall be designed with a Maximum Allowable Working Pressure (MAWP) greater than or equal to 653 psig (45 barg) o The hydrogen dryer system shall be optimized for operation from 435 psig (30 barg) to 580 psig (40 barg)

• The hydrogen dryer system shall be designed to achieve a water concentration of ≤ 5 ppmv meeting hydrogen purity requirements of SAE J2719 and ISO 14687

• The hydrogen dryer system shall be designed for a process stream of gaseous hydrogen at a dew point of 8°C and flow rates from 3.75 kg/hr (41.72 Nm3) to 117.6 kg/hr (1308.3 Nm3) o A minimum of two hydrogen dryer units shall be delivered that when combined can provide the total required flow rate o Operation of a single dryer unit is allowed to meet the low-end flow rate requirement o Independent process inputs and outputs, and the ability to operate dryer units individually is required

• Each hydrogen dryer unit shall be compatible with dynamic operation of the electrolyzer and shall be capable of drying flow rate variations up to 10%/sec of full capacity of each dryer unit (i.e., a 75 kg/hr dryer unit would be capable of maintaining an output of ≤ 5 ppmv as the flow drops from maximum to minimum flow by -7.5 kg/hr/sec)

• Each of the hydrogen dryer units shall be capable of 100% duty (i.e. alternating between multiple Temperature Swing Adsorption beds, other technologies may be acceptable)

• Each of the hydrogen dryer units shall have redundant dewpoint sensors

• Wetted components of the hydrogen dryer system shall be compatible with hydrogen gas

• No sulfur-containing compounds (e.g., lubricants) shall be used in the wetted sections of the hydrogen dryer system

• All pressure-containing sections of the hydrogen dryer system shall be designed per applicable sections of ASME pressure codes

• All components of the hydrogen dryer system shall be suitable for service in Class I Division 2 Group B locations

• The hydrogen dryer system shall have a metallic lug or similar for electrical grounding per NFPA 70 National Electric Code (NEC)

• All electrical components shall be listed by a Nationally Recognized Testing Lab (NRTL) or each dryer unit shall be listed as a whole, and meet applicable sections NFPA 70 National Electric Code (NEC) and NFPA 79 Electrical Standard for Industrial Machinery

• Guarding hardware and/or insulation shall be included to prevent incidental contact with any parts of the hydrogen dryer system that reach hazardous temperatures during normal operation

• The hydrogen dryer system shall not contaminate the hydrogen stream with other gases or particulates > 50 µm

• Each of the hydrogen dryer units shall minimize (<0.1%) the hydrogen loss during normal operation (e.g., due to regeneration of the dryer beds) o For example, Temperature Swing Adsorption (TSA) dryer technology would be acceptable

• The hydrogen drying system may utilize a supply of coolant fluid (50/50 PG/Water) that can be provided at either approximately 2.78°C (37°F) or outdoor ambient temperature

• The dry hydrogen gas shall leave each of the hydrogen dryer units at ≤ 60°C (140°F).

• The manufacturer shall provide an approximation of the space required for the dryer system including footprint and height, as well as required clearances

• The dryer system shall be designed for operation at an altitude of 6,040 ft (1841 m)

• Equipment shall be designed for an indoor location (NREL will provide a climate controlled, weather proof enclosure in which the dryer system shall be deployed)

• A deoxygenation system as part of the dryer is not required

• The quote shall include delivery costs and freight to NREL Flatirons Campus: 19001

W 119th Ave, Arvada, CO 80007

• Dryer system size shall be minimized (NREL’s goal is to fit all the dryer system inside a standard 20’ ISO container)

OPTIONAL CAPABILITIES:

• It is preferred that no more than a maximum of two individual hydrogen dryer units be delivered to meet the drying specifications o Example configurations are shown below

• The hydrogen dryer system is preferred to be powered by nominally 480 VAC 3-phase, 60 Hz power

• Pneumatic valve actuation is preferred

• Optional commissioning support is preferred

• An oxygen analyzer on the hydrogen flow through each dryer system is preferred

ADDITIONAL GENERAL INFORMATION

Example System Configurations: The examples provided are for demonstrative purposes only and the actual system configuration is allowed to vary. The supplier should select the unit configuration and flow rates to best match the strengths or their design and technology

1. Example one

a. One dryer unit capable of drying 11.76 kg/hr to 78.4 kg/hr

b. Second dryer unit capable of drying 3.75 kg/hr to 39.2 kg/hr

2. Example two

a. One dryer unit capable of drying 3.75 kg/hr to 58.8 kg/hr

b. Second dryer unit capable of drying 3.75 kg/hr to 58.8 kg/hr

3. Example three

a. One dryer unit capable of drying 8.82 kg/hr to 58.8 kg/hr

b. Second dryer unit capable of drying 3.75 kg/hr to 58.8 kg/hr

4. Example four

a. One dryer unit capable of drying 11.25 kg/hr to 92.6 kg/hr

b. Second dryer unit capable of drying 3.75 kg/hr to 25 kg/hr

5. Example five

a. One dryer unit capable of drying 3.75 kg/hr to 39.2 kg/hr

b. Second dryer unit capable of drying 3.75 kg/hr to 39.2 kg/hr

c. Third dryer unit capable of drying 3.75 kg/hr to 39.2 kg/hr

6. Example six

a. One dryer unit capable of drying 3.75 kg/hr to 39.2 kg/hr

b. Second dryer unit capable of drying 5.88 kg/hr to 39.2 kg/hr

c. Third dryer unit capable of drying 5.88 kg/hr to 39.2 kg/hr