The ability of soot to bind its own or foreign inert material when heated from the air is known as adhesion, which is another indication of the plasticity exhibited by the colloids formed during pyrolysis. Coal that shows softening and melting properties in soot is called cementitious coal, and coal that does not show softening and melting properties is called non-cohesive coal.
Cohesiveness is not only a major indicator for evaluating coking coal, but also an important basis for evaluating coal as another processing and utilization. Coal bondability is a necessary condition for coal coking and is closely related to the coking properties of coal. The coking coal has the best cohesiveness between gas fat coal and fat coal.
The Significance of Energy-Saving Muffle Furnace for Measuring Coal Heat
The calorific value of coal is one of the important indicators of coal quality analysis.
First of all, as the fuel for coal, the higher the calorific value, the greater the economic value. During the combustion or gasification process of coal, the amount of heat needed to calculate the heat balance, coal consumption, and thermal efficiency. Based on these calculation parameters, the operating conditions and process can be considered to achieve maximum thermal energy utilization. According to the calorific value of the coal, the theoretical air quantity, the theoretical dry flue gas quantity, the wet flue gas quantity, and the achievable theoretical combustion temperature during the combustion of the boiler are also estimated. In addition, when designing various types of boilers, it is also necessary to calculate various parameters such as the combustion material balance based on the average calorific value of the used coal.
Coal's calorific value is a very important parameter in the study of coal quality when it is used to characterize coal's various characteristics. In order to avoid the effect of mineral decomposition and endothermic, the dry coal-based high-level calorific value of the floating coal after heavy-liquid separation is often used in the study of coal quality. The high calorific value after removing moisture and ash ( energy-saving muffle furnace ) is a function of coal coalification degree. According to the law of coal formation, the lowest high-calorific coal of pure coal is peat, and the high coal calorific value of the brown coal with a slight coalification degree is 25120.8-29-307.6j/g, among which the fat of low-volatile coal is the highest. The anthracite coal high calorific value gradually decreases with the increase of carbon content, and some old anthracite coal, its pure coal high calorific value less than 30982.32j/g. Therefore, the view that the anthracite coal has the highest calorific value is incorrect. In addition, according to the high calorific value of pure coal, combined with the volatility yield of coal, it is possible to roughly estimate some characteristic indexes of coal, such as cohesiveness and tar yield.
The calorific value of coal is also an indicator reflecting the degree of coalification, and the calorific value is still long as an index of coal classification. In the international hard coal classification, the coal with a dry ash-free volatile content greater than 33%, that is, the high calorific value of a constant-temperature and constant-humidity ashless coal is used as an index for classifying coal. China also uses the high calorific value of hydrated ash-free base coal as an indicator for classifying lignite and long-flame coal. However, it must be pointed out that the determination of the calorific value tends to cause large deviations. For example, the allowable error of different laboratories in international regulations can reach 300j/g, which limits the scope of its use to some extent. The calorific value must be measured with a coal calorimeter to detect calorific value in accordance with the national standard. This article mainly recommended model ZDHW- HN5000E high-precision microcomputer calorimeter is the most practical, not only to detect the heat of coal, there are oil, straw, coal gangue, shale, fly ash, slag, sludge, tailings, foodstuffs, garbage, etc. The material's calorific value is a wide range of coal quality testing equipment .
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