From Coal to Clean: How Biomass Revolutionised Lime Drying
A key producer of agricultural lime in the South Island recently transitioned from a coal-fired drying system to a sustainable biomass solution. This shift has not only reduced their environmental impact but also improved the quality of their lime and streamlined their operations.
The Challenge of Coal
Previously, the lime producer used a coal-fired system, burning low-grade coal to generate hot air (approximately 1100°C) for lime drying. Rising coal costs and a commitment to environmental responsibility prompted the search for a cleaner alternative.
The Biomass Solution
Tubman Heating supplied an 8MW wood chip burner, the first of its kind in New Zealand. This cutting-edge biomass burner represents a significant investment in sustainable practices and long-term efficiency, providing a cost-effective means to provide heat to varying processes using biomass fuel such as wood chips or pellets.
Installation and Commissioning
The installation and commissioning of the new biomass burner were completed successfully using local expertise, including developing a customised control system tailored to their specific lime drying application. The system is now operational, consistently providing hot air at temperatures above 900°C, effectively drying the lime and contributing to a superior final product.
Operational Performance and Benefits
After several months of operation, the wood chip burner has proven reliable and efficient. Operating up to eight hours most days, it offers several key advantages:
- Rapid Start-Up: The burner reaches optimal temperature in just 30-40 minutes—a significant improvement over the coal system’s four-hour start-up. This dramatically reduces downtime and improves productivity.
- Improved Product Quality: The biomass system has noticeably improved the quality of the dried lime. Customers have commented on its superior quality.
- Sustainable Energy: Using wood chips, a renewable resource, drastically reduces carbon emissions and demonstrates an environmentally friendly approach.
- Scalable Output: Currently utilizing a portion of its capacity, the system can scale up to its full 8MW capacity by increasing fuel supply, providing flexibility for future needs.
The transition to biomass has been a resounding success. The company has not only achieved its environmental goals but also improved product quality and operational efficiency. This investment in sustainable technology positions them for continued success in the agricultural lime market. The switch to biomass serves as an excellent example for other businesses looking to reduce their environmental impact and embrace cleaner energy solutions.