In the heart of China, researchers are blazing a trail to make biomass energy more viable and cleaner. Yan Zhang, a lead engineer at SanHe Power Plant Ltd., part of CHN Energy, has been delving into the intricacies of co-combusting coal with Salix, a fast-growing willow tree, to generate power. The findings, published in Energies, could reshape how we think about biomass energy and its integration into existing coal-fired power plants.
The study focuses on ash accumulation, a significant challenge in co-combustion processes. Ash can stick to boiler walls, reducing efficiency and even causing shutdowns. “Understanding ash behavior is crucial for optimizing co-combustion,” Zhang explains. His team used a high-temperature settling furnace to simulate real-world conditions and observe how different factors affect ash deposition.
One of the key findings is the impact of the biomass blending ratio. As the proportion of Salix increases, so does the calcium content in the ash. Too much calcium can lead to low-melting-point compounds that cause severe ash accumulation. “We recommend keeping the Salix blending ratio at or below 20% to avoid these issues,” Zhang advises.
Temperature also plays a pivotal role. When flue gas temperature exceeds 1200°C, ash particles start to melt and stick together, forming a stubborn layer that’s difficult to remove. Similarly, if the wall temperature surpasses 600°C, severe ash slagging can occur, threatening the boiler’s safe operation.
These insights could have significant commercial implications. By optimizing the blending ratio and controlling temperatures, power plants can enhance the efficiency and safety of co-combustion processes. This could lead to more widespread adoption of biomass energy, reducing greenhouse gas emissions and promoting sustainable energy use.
The research also opens avenues for future developments. For instance, understanding how different biomass types affect ash behavior could lead to tailored co-combustion strategies. Moreover, exploring additives or coatings that prevent ash adhesion could further improve the process.
As the energy sector grapples with decarbonization, studies like Zhang’s offer a beacon of hope. They demonstrate that with the right knowledge and technology, we can make renewable energy more accessible and efficient. And as the world transitions to a greener future, every bit of progress counts.
The study was published in Energies, a peer-reviewed journal that focuses on energy research and technology. The journal’s name is derived from the Latin word for “energy,” reflecting its commitment to advancing our understanding of this vital resource.