Shaanxi Weihua successfully achieved slurry concentration improvement and reduced energy consumption by implementing technical upgrades to rod mills

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According to Shaanxi Weihua Group, by implementing technical upgrades to the rod mill in its gasification workshop, it succeeded in increasing the concentration of coal slurry and reducing energy consumption as of April 1, 2026, thereby significantly improving economic efficiency. The coal slurry concentration was increased by 2.5%, resulting in an effective gas content of 81.2%–81.6%. Using the No. 2 rod mill as a test platform, the gasification workshop adopted a renovation approach that involved directly replacing the reducer and drum screen. Measures such as altering the transmission chain, increasing the rotational speed, and speeding up the discharge rate were taken, resulting in record-high slurry concentrations that exceeded previous historical values on several occasions. During the 72-hour performance verification period, samples were taken 9 times in total. The rotation speed of Rod Mill No. 2 increased from 15.8 revolutions per minute to 16.7 revolutions per minute, while the slurry concentration rose from 62.31% to 64.13%; the highest concentration reached 65.19%, marking the highest level ever recorded since the machine was put into operation and setting a new record. Furthermore, the effective gas content increased further to 81.9%. By 2025, the average operating time per unit for the gasification units in phases I and III of Weihua will be 83 days and 91 days respectively, while the maximum operating time per unit will be 106 days and 120 days respectively. In October 2025, the coal consumption per ton of ammonia equivalent for methanol and synthetic ammonia across the entire company was 1.89 tons, reaching record levels since the company’s establishment. By 2025, the comprehensive exhaust gas treatment system for the granulation tower will be built and put into operation. The first phase of the headquarters of Shaanxi Weihe Coal Chemical Group has an annual production capacity of 300,000 tons of synthetic ammonia and 520,000 tons of urea; it came online in 1996. Phase II has an annual production capacity of 200,000 tons of methanol and 100,000 tons of dimethyl ether, and was put into operation in 2006. Phase 3 involves 400,000 tons of methanol, with commissioning in 2011. All units 1, 2, and 3 utilize GE coal-water slurry gasification.