On June 24, the Shaanxi Yulin Western Coal Technology Research Center successfully produced high-concentration coal-water slurry for gasification using lignite from Hulunbeier City, Inner Mongolia. The process utilized self-developed low-rank coal fine dry powder and was carried out on a custom-built industrial pilot line. The resulting coal-water slurry achieved a coal concentration of 63.8% with a viscosity of 1200 cPa, marking a significant breakthrough in the industry. This world-first production line has made it possible to apply lignite in coal chemical industries, which was once considered a major challenge.
Currently, the application of lignite in coal chemistry remains a global issue. The maximum concentration of coal-water slurry produced through traditional wet processes is generally no more than 48%. Both China and developed countries have attempted to enhance this technology, but high costs have always been a major obstacle. Since 1996, the Western Coal Technology Research Center has focused on the vast lignite reserves in Inner Mongolia—nearly 100 billion tons—and conducted research on high-concentration coal-water slurry technology for low-rank coal. Their pilot tests across different regions in China have consistently achieved coal-water slurry concentrations over 60%, surpassing even those made from clean coal.
Lignite is known for its instability, tendency to spontaneously combust, low calorific value, high moisture content, and difficulty in drying, which limits its direct use. To address these issues, the center employed physical and chemical methods to break water-containing functional groups in lignite, preventing it from absorbing water. They also used the lignite itself to create high-concentration coal-water slurry, effectively solving the problem of secondary water absorption. Additionally, they developed new pulping techniques and chemical additives, optimized particle size grading, and improved the packing ratio. The entire process is simple, efficient, and fully automated, with a cost of only 98 yuan per ton of pulp. The effective gas yield can reach up to 73%.
Previously, Datang Hulunbeier Fertilizer Company used a domestic lignite wet process to prepare coal-water slurry with a concentration of only 48%, leading to high synthetic ammonia consumption. The company estimates that increasing the coal slurry concentration to 60% could significantly reduce coal usage and lower oxygen and power consumption.
To date, the Western Coal Technology Research Center has conducted lignite tests in 21 different producing areas and established 10 industrialized pilot production lines, demonstrating the wide applicability and promising future of this groundbreaking technology.
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