Unlocking the Power of Sugar Cane Waste

In a groundbreaking development, researchers from the University of Johannesburg have discovered an innovative process that converts crushed sugar cane waste into green hydrogen with remarkable efficiency, far surpassing traditional methods.

A Leap Forward in Energy Efficiency

Using a sophisticated simulation known as SECLG (Sorption-Enhanced Chemical Looping Gasification), the researchers have demonstrated significant advancements in energy efficiency for green hydrogen production. This method drastically reduces the generation of harmful by-products such as tar, carbon monoxide, carbon dioxide, and nitrogen, setting it apart from conventional biomass gasification techniques that are notorious for their inefficiencies.

Targeting Energy-Intensive Industries

The implications of this new process are extensive. It holds the potential to decarbonize industries like steel and cement, which are typically heavy consumers of energy.

The Pitfalls of Current Gasification Methods

Current large-scale gasification methods lack energy efficiency, often resulting in high levels of tar and other undesirable outputs. Professor Bilainu Oboirien elaborates, explaining that existing syngas from biomass produces variable percentage compositions—hydrogen (10-35%), carbon monoxide (20-30%), and significant tar and carbon dioxide—compounding operational costs with additional cleaning equipment.

Introducing Sorption-Enhanced Chemical Looping Gasification (SECLG)

The SECLG method presents a revolutionary approach to biomass gasification. This technique not only enhances the purity of green hydrogen but also increases yield while being energy-efficient. Crucially, it allows for in-process carbon capture.

Innovative Research and Modeling

Working alongside UJ Master's candidate Lebohang Gerald Motsoeneng, Professor Oboirien developed a mathematical model and performed a detailed Aspen Plus simulation of the SECLG process. Their research focused on comparing two metal oxides used as oxygen carriers to optimize hydrogen yield.

Outstanding Yields and Reduced Costs

The results are promising: the SECLG process can achieve hydrogen yields of 62-69%, significantly lower tar production (less than 1 g/nm³), and a minimal amount of carbon dioxide. This combination not only improves environmental outcomes but also cuts down on the need for expensive equipment.

Towards Real-World Implementation

Although the current model showcases great potential, it does not yet account for real-world material degradation or the separation of ash and char. Professor Oboirien notes, "We are still validating our models through experimental proof of concept in a laboratory setting."

Investment and Collaboration: The Road Ahead

To successfully implement the SECLG process at scale, investment in infrastructure and collaboration across industries will be essential. This research opens the door to a sustainable future in green hydrogen technology.

With the promise of cleaner energy on the horizon, sugar cane waste may soon be a catalyst in the fight against climate change.