1. Coal adhesion The cohesiveness of coal refers to the ability of coal particles to be melted and bonded into a coke block after being heated to a certain temperature under air-tight conditions. Generally expressed in the Roga index and the gel layer index. The Roga Index is an indicator of the cohesiveness of bituminous coal. It is the ability of the bituminous coal to produce colloidal body to bond other inert substances during the heating process. It is used as the basis of the index of cohesiveness to identify the cohesiveness of coal and determine the grade of coal. The colloidal layer index refers to the thickness of the organic matter which is decomposed by heat and softened into a colloidal layer after the coal particles are heated to a certain temperature under the condition of insulating air, and is usually expressed by the maximum thickness Y value. The higher the Roga index, the better the coal's cohesiveness. The higher the gel layer index, the better the coking property of the coal. The coal bonding performance is affected by various factors such as coal coalification degree, coal rock composition, oxidation degree and ash. The coal with the highest degree of coalification and the lowest coal is generally not cohesive. 2, the calorific value of coal The calorific value of coal is also an important indicator of coal quality. It refers to the amount of heat generated per unit mass of coal when it is completely burned, expressed in MJ /kg. The calorific value and the degree of coalification change regularly. Generally, the higher the degree of coalification, the higher the calorific value of coal. 3. Chemical activity of coal The chemical activity of coal refers to the reaction ability of coal to interact with water vapor, oxygen and the like at a certain temperature, and is an important index for evaluating coal for coal gasification and power. 4. Thermal stability of coal The thermal stability of coal refers to the ability of lump coal to maintain its original bulk under high temperature conditions. It is also an important indicator for evaluating coal for coal gasification and power.
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Coal process performance indicators include adhesion, heat, chemical reactivity, thermal stability, coal and the like.