Do you know the combustion characteristics of coal?
Although some of the combustion characteristics of coal can be roughly understood through industrial analysis of coal, further understanding of coal combustion characteristics is needed in order to make more rational use of fuel. In recent years, a large number of studies have proposed some indicators that can more effectively reverse the combustion characteristics of coal supply, mainly including the following.
① The combustion diagram of coal, also known as the combustion diagram of coal, refers to the curve of the combustion rate of a coal sample (represented by the weight loss rate dW/dr) changing with temperature under certain conditions (such as heating rate, sample particle size, sample quality, air supply, etc.). This curve is measured using a "thermal balance" instrument, where experimental conditions can be set and the weight loss rate of the coal sample can be measured.
The combustion diagram of coal can be used to comprehensively evaluate the ignition and combustion process of coal, and to compare the combustion of different types of coal. Research has shown that if the combustion diagram of coal is similar, the combustion situation in the furnace is also basically similar.
② The reaction index reaction index refers to the heating temperature required for a coal sample to reach a heating rate of 15 "C/min when heated in oxygen, expressed in T1s. The higher the T1s value, the harder it is to ignite and burn the coal. Obviously, the lower the volatile content of coal, the higher the T15 value. However, the degree of influence of volatile content of different coal types varies. Therefore, using T1s to determine the ignition and combustion characteristics of coal is more direct and accurate than using volatile content.
③ The quenching temperature refers to the quenching temperature of coal measured by heating it to the ignition point and then stopping heating. The higher the volatile content of coal, the higher the heat release after ignition and combustion, the higher the combustion stability (i.e., it is not easy to extinguish), and the corresponding extinguishment temperature is lower. Therefore, based on the level of quenching temperature, the combustion stability of different types of coal after ignition can be determined, which is also an indicator of coal combustion characteristics.