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Weihua Group: Improved Efficiency through Slurry Concentration Author/Source: Weihua Group Date: 2021-05-17 Clicks: 5 In the ethylene glycol production process at Binzhou Company, high-concentration, qualified water-coal slurry plays an important role in ensuring efficient and stable operation of the system. At the end of April, the gas production workshop held a competition focused on improving the concentration of water-coal slurry in the production units, achieving a concentration of 62.5%–63.5%, which generates annual economic benefits of around 7 million yuan. Control the quality of raw coal to increase the concentration of coal slurry. The degree of coal transformation, lithological composition, ash composition, and internal water all affect the concentration of coal water slurry, among which the internal water in coal is the key factor influencing this concentration. The lower the internal moisture content of coal, the easier it is to produce a water-coal slurry with a higher concentration. Therefore, starting with the raw coal and ensuring strict control over its quality, the intrinsic moisture content of the coal is kept within 7%, thus laying a foundation at the source for the production of high-concentration water-coal slurry. Adjust the ratio of steel rods to change the particle size distribution. The ratio of steel rods has a direct impact on whether the particle size distribution of the coal slurry is appropriate; the ratio of large and small rods as well as the process conditions should be adjusted accordingly based on the type of coal. If the particle sizes are too large, the feed volume can be reduced, and the number of rods used in the equipment can be increased appropriately. If the particle size is too fine, the feed rate can be increased, and the amount of rods used in the equipment can be reduced. After analyzing the particle size parameters of the coal slurry, the workshop’s technical team adjusted the proportion and quantity of the grinding mill rods on four occasions, thereby determining the technical parameters for high-concentration coal water slurry. Reducing pulp production costs and helping to improve efficiency: Additives can alter the viscosity of coal slurry, thereby determining its flowability and stability. The workshop technicians make timely adjustments and strictly control the usage levels, ensuring the production of high-concentration coal slurry as long as its viscosity meets the process specifications. In the original design for gasification, limestone was chosen as a flux, but after studying the melting properties of the raw coal ash from Binzhou, a special meeting in the gas production workshop led to the decision to stop using limestone. After a period of adjustment, slag discharge from the gasifier is operating normally. Through these measures, by early May the workshop managed to keep the slurry concentration between 62.5% and 63.5%. As the slurry concentration increased, the reaction efficiency of the slurry in the gasifier improved significantly, leading to an increase in gas production and a notable boost in the operational efficiency of the facility.