Thermogravimetric Study Coal Ignition Characteristics

The thermogravimetric apparatus has some advantages such as high precision, convenience, well-repetition characteristic etc. More and more research institutions make use of the experimental means to analyze the coal combustion characteristic, and apply it to supervise the usage of the coal in station boiler. There are different results in different papers because of the different apparatus. Many papers analyze the factors influencing the results , but have some deficiency in the aspects of coal samples.We select some coal samples frequently used in the power plants in Zhengjiang province and analyze the heat agravic characteristic. TG curve of different coal samples can be got under different experiment conditions. The heat agravic curves of burning processions can be divided into three types in this paper. We discuss all kinds of the line types in these experiments thoroughly, and analyze the influences of the experiment conditions. Then we set up the catching fire index of the thermogravimetric apparatus which estimate the burning of coal.In this paper we calculate the activation energy of catching fire and prove the correctness of catching fire temperature by means of the activation energy.