Proton Exchange Membrane Pem Electrolysis

 

1. Compact Design

Featuring a high operating current density ranging from 1.5 to 3A/cm², alongside a core tank area thickness of less than 1m, and a skid-mounted integrated auxiliary control system, this electrolyzer ensures a small footprint while maintaining optimal functionality.

2. Enhanced Efficiency

With DC power consumption consistently below 4.3 kWh/Nm³, a thermal efficiency exceeding 75%, and utilizing PEM membrane electrodes of internationally recognized excellence, this electrolyzer delivers superior efficiency standards.

3. Versatile Scalability

Designed with a compatible assembly program and tailored to accommodate diverse tank parameters, this electrolyzer offers robust expandability. Its skid-mounted platform integration further enhances adaptability for varied operational requirements.

4. Swift Responsiveness

Benefiting from rapid start-up capabilities with a hot start duration of just 5 seconds and a cold start duration of under 300 seconds, alongside adaptable load variations ranging from 5% to 120%, this electrolyzer ensures prompt response times and reliable performance.

5. Uncompromising Safety

Incorporating a self-developed dual-wire sealing design program and equipped with multi-gas sensor monitoring and alarm interlock functionalities, alongside meticulous control over pressure, temperature parameters, and hydrogen production circuit logic, this electrolyzer guarantees ultra-safe operation at all times.

 

 

This PEM electrolyzer boasts a remarkable hydrogen production capacity of 200Nm³/h per cell, making it ideally suited for large-scale industrial applications while firmly supporting the integration of clean power solutions.

1. Reduced Energy Consumption

In addition to its exceptional productivity, this electrolyzer prioritizes energy efficiency. With a DC power consumption rate of merely 4.3kWh/Nm³, it significantly outperforms conventional electrolyzers, thereby lowering production costs and exemplifying a commitment to sustainable practices.

2. Elevated Hydrogen Purity

Prior to purification, hydrogen purity exceeds 99.9%, reaching beyond 99.999% post-purification. This heightened purity level is indispensable for fuel cell applications and various other industrial sectors.

3. Consistent Operational Parameters

3.1 Optimal Working Pressure: Operating at a stable pressure of 3.0 MPa ensures the hydrogen output matches this pressure requirement, catering to diverse operational needs and reducing the necessity for additional pressurization, thereby cutting costs.

3.2 Reliable Operating Temperature: With an operating temperature set at 70±5℃, this electrolyzer guarantees exceptional stability and adaptability in various operating conditions.

4. Wide Power Fluctuation Tolerance

With a power adjustment range spanning from 5% to 110%, this electrolyzer can effectively operate amidst significant fluctuations in the power supply, ensuring consistent performance despite varying energy inputs.

6. Rapid Start-up Technology

Shortened Hot and Cold Start Durations: Cold starts require less than 5 minutes, minimizing production downtime, while hot starts take a mere 5 seconds, swiftly optimizing equipment performance for efficient operation.

 

Name	Parameter
Hydrogen production capacity (Nm3/h)	200
Peak hydrogen production capacity (Nm3/h)	240
DC power consumption (kWh/Nm3)	≤4.3
Hydrogen purity (Before purification)	≥99.9%
Electrolyzer Enclosure– W x D x H(m)	0.8x0.6x1.5
Operating pressure (MPa)	3 . 0
Operating temperature (℃)	70±5
Ambient Temperature (℃)	5~40
Power consumption range	5-1 2 0 %
Cold start time (Minute)	≤5
Hot start time (Second)	5
Service life (Year)	≥5
Electrolyte	H2O
Separation Unit
Rated oxygen processing capacity	100 Nm3/h
Oxygen purity (rated operating conditions)	>99.8%(0.2 MPa);>98.5%(3 MPa)
Oxygen outlet temperature(℃)	70±5
Purification Unit
Hydrogen purity (After purification)	≥99.999%
Dew point of hydrogen	-70℃
Hydrogen outlet temperature	Ordinary temperature

 

 

1. Green Hydrogen Production from Renewable Sources

Utilizing large-scale wind power generation, photovoltaic power generation, and wind-solar complementary power generation projects, this system facilitates the production of green hydrogen. Its purpose is to mitigate the curtailment of renewable energy by converting surplus power into hydrogen, thereby promoting sustainable energy practices.

2. Transportation Solutions

With its compact footprint and high efficiency, this technology finds application in hydrogen refueling stations for fuel cell electric vehicles (FCEVs). By ensuring rapid and sustainable hydrogen fuel supply, it accelerates the adoption of FCEVs and contributes to the advancement of clean transportation initiatives.

3. Laboratory and Research Applications

Designed to deliver high-purity hydrogen, this system caters to laboratory environments, facilitating research into hydrogen production technologies and enabling the evaluation of hydrogen fuel cell performance.

 

Introduction and advantages of PEM

Proton exchange membrane (PEM) water electrolysis technology for hydrogen production uses a polymer membrane with proton conductivity as the electrolyte, in which no alkali liquid is involved. The separator of the electrolytic cell is made up of proton exchange membranes. In the PEM water electrolyzer, water is decomposed into oxygen (O2), electrons (e-) and hydrogen ions (H+) at the anode where the oxygen is discharged. Electrons flow to the cathode through the external circuit, while protons flow to the cathode through the proton exchange membranes. At the cathode, the hydrogen ions combine with electrons to form hydrogen gas (H2).

 

Compared with the ALK electrolyzer, the PEM electrolyzer is superior for its large current density, high purity of hydrogen, and fast response speed, and adaptability to integration with wind and solar energy storage technology. However, the highly acidic and oxidizing operating environment required by the PEM electrolyzer makes it more dependent on precious metal materials such as Ir, Pt, and Ti, resulting in a high cost of the PEM electrolysis equipment for now.

 

Structure and costs of PEM:

The PEM water electrolyzer consists of the proton exchange membrane, catalyst layer, gas diffusion layer, and bipolar plate from inside to outside. The membrane electrode assembly (MEA) is made up of the gas diffusion layer, catalyst layer and proton exchange membrane, where most of the material transmission and electrochemical reactions take place in the entire water electrolyzer.

 

Currently, the membrane used for proton exchange in most PEM electrolyzers is the perfluorosulfonic acid proton exchange membrane. The features and structure of the membrane electrode is directly related to the performance and lifespan of the PEM electrolyzer.

 

As the core component of the entire system, 45% of the system cost is invested in the electrolyzer, of which bipolar plates take up more than 50% of the cost of the stack, and membrane electrodes take up about 1/4. The cost of precious metals account for about 10% of the system cost. The bottleneck in further expansion of the PEM electrolyzer may be determined not only by the high cost of precious metals, but also by their supply available. Thus, it is necessary to minimize the use of precious metals or explore alternative materials.

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