Introduction:
In a significant stride towards sustainable development in the coal chemical industry, the world’s largest gasification slag incinerator has successfully completed a trial run in Xinjiang, China. This groundbreaking project, developed by the Institute of Engineering Thermophysics of the Chinese Academy of Sciences, promises to revolutionize the way gasification slag, a major byproduct of coal gasification, is managed and utilized, paving the way for a more circular coal economy.
The Scale of the Challenge:
China’s coal gasification industry generates over 70 million tons of gasification slag annually. Traditionally, this waste material has been disposed of through landfilling or stockpiling, methods that are not only environmentally unsound but also fail to capture the potential value embedded within the slag. This lack of effective reduction, recycling, and harmless disposal has become a critical bottleneck hindering the sustainable development of the modern coal chemical industry.
Technological Innovation and Breakthrough:
The research team at the Institute of Engineering Thermophysics tackled this challenge head-on, leveraging the fundamental principles of circulating fluidized bed combustion and their in-depth understanding of gasification slag combustion mechanisms. This led to the development of a series of key technologies for gasification slag circulating fluidized bed incineration.
The technology was rigorously tested and validated on a pilot-scale platform with a capacity of thousands of tons per year. The results demonstrated that the technology could efficiently incinerate various types of gasification slag without the need for auxiliary fuels. Third-party testing by authoritative institutions confirmed an impressive gasification slag combustion efficiency of 99.36%.
The Xinjiang Demonstration Project:
Based on the successful pilot-scale research, the team designed and constructed the first gasification slag circulating fluidized bed incinerator in Shihezi, Xinjiang. The project, with EPC (Engineering, Procurement, and Construction) general contracting undertaken by Sinocoal Hefei Gasification Technology Co., Ltd., commenced construction in May 2023, completed hydraulic testing in June 2024, and began trial operation in January 2025.
This demonstration project is designed to handle 490,000 tons of gasification slag annually, generated by four sets of coal-water slurry gasifiers. It also produces 1.3 million tons of steam per year for use in the industrial park, turning waste into a valuable resource. The treated slag is then repurposed as a raw material for cement production, further closing the loop in the circular economy.
Economic and Environmental Benefits:
The successful trial operation of this large-scale incinerator marks a significant breakthrough in China’s solid waste disposal in the coal chemical industry. The technology’s successful application and future promotion are expected to unlock the last mile of the coal circular economy. This will not only bring significant economic benefits to enterprises and local communities but also contribute to a more sustainable and environmentally friendly approach to coal utilization.
Looking Ahead:
This project, supported by the Chinese Academy of Sciences’ Clean Coal Combustion and Low-Carbon Utilization Strategic Priority Research Program (XDA29020300), represents a major step forward in addressing the challenges of gasification slag disposal. As the technology matures and is deployed more widely, it has the potential to transform the coal chemical industry, promoting resource efficiency, reducing environmental impact, and contributing to a more sustainable energy future.
References:
- IT之家. (2025, April 1). 全球最大气化灰渣焚烧炉在新疆成功试运行 [World’s Largest Gasification Slag Incinerator Successfully Trial-Operated in Xinjiang]. Retrieved from https://www.ithome.com/0/823/185.htm
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