As a part of clean coal technology, the coal water slurry has a popular application in the conventional and new thermal power stations. The hydrotransport is now-a-days a preferred method, due to its low specific energy consumption and non-polluting nature. The lignites and high ash coals, available in abundance, show poor slurryability, thereby making the process unsustainable. This study proposes and demonstrates how a careful selection particle size distribution can help in the improvement of the slurry stability, rheology and flow characteristics. To achieve this objective, 3 different size ranges of pre-pulverized coal are considered and blended to get a total of 8 blended samples. The influx concentration of a given sample ranges in 10–60%. The influx velocity of mixture lies in the range of 0.25–1.25 m/s, through a pipeline of 100 mm diameter. The parameters viz. Settling characteristics, apparent viscosity, headloss and specific enthalpy consumption are evaluated to choose the best particle size distribution of the coal sample. The 30% fraction of >53 μm and <75 μm particles and 20% fraction of >75 μm and <106 μm are found to be optimum for high stability, low viscosity and specific enthalpy consumption. This study provides a simple solution to enhance the flow characteristics of a high ash Indian coal.

水煤浆作为洁净煤技术的一部分，在常规和新型火电站中有着广泛的应用。由于其低能耗和无污染特性，水力运输是当今的首选方法。大量可用的褐煤和高灰分煤显示出较差的成浆性，从而使该过程不可持续。本研究提出并展示了仔细选择粒度分布如何有助于改善浆料稳定性、流变学和流动特性。为实现这一目标，考虑并混合了 3 个不同尺寸范围的预粉煤，共得到 8 个混合样品。给定样品的流入浓度范围为 10-60%。混合物的流入速度在 0.25-1.25 m/s 范围内，通过直径为 100 毫米的管道。参数即。对沉降特性、表观粘度、水头损失和比焓消耗进行评估，以选择煤样的最佳粒度分布。发现 >53 μm 和 <75 μm 颗粒的 30% 部分和 >75 μm 和 <106 μm 的 20% 部分对于高稳定性、低粘度和比焓消耗而言是最佳的。该研究提供了一种简单的解决方案来增强高灰分印度煤的流动特性。低粘度和比焓消耗。该研究提供了一种简单的解决方案来增强高灰分印度煤的流动特性。低粘度和比焓消耗。该研究提供了一种简单的解决方案来增强高灰分印度煤的流动特性。