NEXON STAR PEM Water Electrolysis Stack and Facility, NES X Series
• High Efficiency PEM-Type Stack
• Optimized performance for renewable energy load fluctuations
• Reduce investment and operating costs by using ultrapure water and RO water
• Application of cell unit maintenance optimization patented technology
NEXON STAR is sustainable through technological innovation of green energy. Since its foundation in 2014, for a prosperous future for mankind, we have continued to invest in R&D in green energy technology innovation.
NEXON STAR's NES X Series stack is the next generation that applies Nexon Star's original patents (3 cases, Feb. 23) such as structural design and control technology in addition to the advantages of the existing 2nd generation PEM-Type stack. With the water electrolysis stack, the water electrolysis performance of various distributed standards with hydrogen production of 5 to 250 N㎥/h is realized.
The NES X Series stack will be continuously operated at 100% load for 110 hours from January 4th to 9th in the Ulsan Headquarters of the Korea Institute of Industrial Technology in 2023.
Optimized results were also obtained in terms of efficiency of 77% and response to the variability of renewable energy supplied to the operation of water electrolysis facilities depending on the weather and season.
(related articles)
NEXON STAR is enhancing the competitiveness of the water electrolysis stack through continuous R&D investment in improving the efficiency of the stack, strengthening durability, lowering the cost of core parts such as electrode assemblies and separators, and developing materials. I will continue.
NEXON STAR NES(Nexonstar Electrolysis System) product series
Next-generation distributed water electrolysis facility that optimizes the advantages of self-stack patented technology and PEM-type water electrolysis
[ NEXON STAR Electrolysis Equipment & stack ]
• Stack efficiency at the level of a global leading group
- Recorded 77% efficiency for 110 hours of continuous operation under 100% stack load condition
(overseas average: 70-75%, domestic 45% level, 2022 KIER data)
- Water electrolysis facilities to be launched actually target efficiency of 80% or more
• Renewable energy load change linked response technology
- Fast responsiveness by applying patented technology and hatching change responsive facility optimized for renewable energy load change of 5~100% operating range
- Securing durability by repeating start/stop operation
• Optimization control technology
- Water electrolysis that enables self-diagnosis, predictive maintenance, and early warning by measuring and managing the temperature, voltage, current, and pressure of the stack unit cell
- Application of stack design patented technology that is advantageous for thermal management and minimizes repair downtime by making it easy to check and replace defective cells
• Distributed water electrolysis and RO water water splitting hydrogen production
- Distributed production and storage possible with high-pressure output (30 to 80 bar compression without a compressor)
- 5Nm3/h ~ 250Nm3/h Various sizes, from small-scale hydrogen power supply to large-scale hydrogen production complexes such as city centers and houses, requiring less land
- Reduction of ultrapure water facility investment cost by using RO water for hydrogen production
| Electrolysis Stack Specific information | |
|---|---|
| Electrolisis type | PEM |
| Voltage range | < 2 V |
| Operating temperature | 70 ~ 90 ℃ |
| Voltage efficiency(HHV) | about 80% |
| Hydrogen generation rate | > 5 N㎥/h |
| Stack scale | < 30 kW |
Electrolysis Equipment Specific information |
|
|---|---|
Model |
NES-X series |
Nm³/h @ 0°C, 1 bar |
5 ~ 250 Nm³/h |
kg/day |
10 ~ 540 kg/day |
H₂ Purity(with Optional Purification) |
99.99 - 99.999 % |
Water quality |
DI / RO water |
Load range(%) |
5 ~ 100 % |
Efficiency(HHV) |
80 % |
Operation pressure(bar) |
5 – 8 bar |
Operation temperature(°C) |
70 - 90 ℃ |
Stack lifetime(operation hours) |
60,000~90,000 |
In the case of water electrolysis, a general hydrogen production method, it is dependent on the ESS Energy Storage System due to difficulties in responding to load changes in renewable energy power, but NEXON STAR Stack is an ESS-independent water electrolysis device optimized for load fluctuations in renewable energy with an operating range of 10 to 100%.
- overshoot, undershoot Securing fast response to supply power
- Securing durability when starting and stopping repeatedly
- Reverse current prevention when stack is stopped due to load change
- Securing durability of electrode load fluctuation due to irreversible oxidation due to reverse current
- Securing stability of separation membrane to prevent gas mixing at low load
- Prevention of reduction in current efficiency due to shunt and leakage
In the case of a general water electrolysis stack, it is impossible to monitor and manage each cell, so when a failure occurs, a long period of operation is stopped during checking and repairing a defective cell. By applying patented technology that can measure and manage signals and self-developed remote terminal device, downtime can be minimized through monitoring of defective cells, notification in advance, confirmation and replacement.
-Measurement management and control of stack unit cell temperature (thermal management), voltage, current, pressure, etc.
-Self-diagnosis and early warning possible through monitoring by stack cell
Existing PEM water electrolysis facilities use ultrapure water for hydrogen production, so water purification facilities are essential, but Nexon Star's stack technology uses RO water that does not require ultrapure water purification facilities. Since it is possible, it is possible to reduce the cost of hydrogen production by reducing the facility investment cost for supplying ultrapure water.
By applying the patented technology of stack design, data such as temperature, voltage, current, and pressure of the stack unit cell is collected, and self-diagnosis, predictive maintenance, and early warning information of the stack unit is provided and maintained. Maintenance and downtime can be reduced to reduce operating expenses (OPEX).
The value of various measuring points of the complex gas meter that measures the hydrogen purity and hydrogen production of the water electrolysis facility and the high-precision power meter that measures the voltage, current, and power of the facility are displayed on a remote terminal. It is collected in real time through a device (RTU, Remote Terminal Unit) and converted into a database in the form of big data, connected to blockchain, remote monitoring and statistics/analysis through Cloud, It provides control operation, prognostic alarm, early alarm, etc.
NEXON STAR's ICT system is an integrated operation and monitoring platform for hydrogen production, distributed data integration through remote operation, carbon credits (CDM, VCM) business that combines blockchain technology, We aim to operate an integrated platform such as the virtual power plant (VPP) business of distributed power generation and the RE100 certification business.
[ NEXON STAR D-RTU 100 ]
[ NEXON STAR real-time big data analysis and monitoring system ]
NEXON STAR's water electrolysis facility stack has secured global competitiveness in terms of technology such as efficiency and durability. We are continuously investing in R&D to improve uptime.
According to the Korea Institute of Energy Research, when device efficiency increases by 60-70%, hydrogen unit price decreases by 17%, and when operating efficiency increases by 50% or more, hydrogen unit cost decreases by 60%. NEXON STAR will secure global competitiveness by concentrating its R&D capabilities on efficiency, load variability, durability, uptime improvement, and operation management efficiency improvement.
