Wanhua’s coal slurry concentration and consumption reduction project in Fujian has passed the acceptance inspection

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Recently, the technical renovation project aimed at concentrating coal slurry and reducing consumption while improving efficiency in the gas generation unit of Wanhua Chemical (Fujian) Co., Ltd. was successfully accepted. This project applies the Sanfeng-grade coal water slurry concentration technology developed by China National Coal Technology & Engineering Group Clean Energy Co., Ltd. to large-scale four-nozzle coal water slurry gasification units, achieving significant benefits in terms of concentration and cost reduction; it provides a new practical reference for energy savings and efficiency improvement for domestic users of four-nozzle gasification systems. 　　It is reported that the first and second phases of Wanhua (Fujian) gas generation facility utilize Texaco single-nozzle and Huali four-nozzle water-coal slurry pressurized gasification technologies, respectively. Phase 1 is equipped with three Ø3200 mm gasification furnaces, with each furnace capable of processing 1,440 tons of coal per day; Phase 2 features two Ø4000 mm gasification furnaces, with each furnace able to process 4,000 tons of coal per day. The pulping unit employs a three-peak graded CWS concentration technology, which organically combines rod milling, fine milling, and ultra-fine milling. This allows for precise control over the back-mixing ratio of fine and ultra-fine slurries, thereby optimizing the particle size distribution of the final coal slurry. As a result, high-quality CWS is produced for use in gasifiers. The technical upgrade project subject to this acceptance was successfully commissioned for the first time on January 5, and passed the 72-hour performance test on March 24. During this period, the unit operated continuously and stably; under the same raw material conditions, the coal slurry concentration increased by about 3 percentage points, while when non-coal raw materials such as tar were used, the concentration increased by about 2.6 percentage points. 　　This technological upgrade has effectively expanded the range of raw coal options available to Wanhua (Fujian). The high-quality coal slurry produced has successfully been adapted to two types of gasification units, enabling flexible adaptation and stable supply under complex operating conditions. Furthermore, the project achieves significant improvements in energy efficiency and emission reductions. After preliminary tuning, the effective gas ratio of the four-nozzle gasifier increased by more than 1.5 percentage points.