ABSTRACT

To enhance the combustion efficiency of high moist coal, it is important to reduce its moisture contents. For reduction of moisture contents, the selection of efficient and low-cost drying technique based on the coal characteristics is helpful to convert the high moist coal to good quality fuel. A total of 18 Thar coal (Pakistan) samples were crushed and sieved at following size fractions (355, 500, 710 µm). These samples were dried using different techniques, namely, solar-drying, hot air-drying, oven-drying, microwave oven-drying, and flue gases drying. The morphological, physical, and chemical changes were investigated for the effectiveness of different techniques to make the Thar coal as a value-added fuel. The applied drying techniques showed a significant reduction in moisture contents from the Thar coal samples (38.11 to 7.78%). However, the flue gases drying and air-drying techniques showed highest reduction in moisture content (29–31%). Similarly, 35% increase in heating value (HV) J/kg was observed in case of flue gases drying technique. These results indicated that the flue gases and air-drying techniques may be used to reduce the moisture contents and enhance the HV of high moist Thar coal that can be used as value-added fuel in the country.

摘要

为了提高高湿煤的燃烧效率，降低其水分含量很重要。为降低水分含量，根据煤的特性选择高效、低成本的干燥技术，有助于将高湿煤转化为优质燃料。共有 18 个塔尔煤（巴基斯坦）样品被粉碎并筛分为以下尺寸分数（355、500、710 µm）。这些样品使用不同的技术进行干燥，即日光干燥、热风干燥、烘箱干燥、微波炉干燥和烟气干燥。研究了形态、物理和化学变化，以了解不同技术将塔尔煤作为增值燃料的有效性。应用的干燥技术表明塔尔煤样品的水分含量显着降低（38.11% 至 7.78%）。然而，烟道气干燥和空气干燥技术的水分含量降低幅度最大（29-31%）。同样，在烟气干燥技术的情况下，热值 (HV) J/kg 增加了 35%。这些结果表明，烟气和空气干燥技术可用于降低水分含量并提高高湿塔尔煤的HV，可用作该国的增值燃料。