Study on Thermal Loss and Heat Transfer Characteristics of Oxidized Spontaneous Combustion of Coal-based Activated Carbon

Abstract

To research the heat transfer characteristics and thermogravimetric change of coal-based activated carbon during oxidation, and collected three kinds of coals in the production process of coal-activated carbon: briquette, carbonized materials, activate material. Laser thermal conductivity meter and thermogravimetric-differential thermal simultaneous thermal analyzer were used to measure the thermophysical properties and thermal weight loss parameters in the sample oxidation process, combined with the nonlinear oxidation thermodynamic method, and the apparent activation energy is calculated. The results demonstrated that the total heat release and maximum heat release rate of the activated material and the carbonized material are greater than briquette material. Thermal physical parameters show obvious stage characteristics. The order of thermophysical parameters to temperature sensitivity of the sample is: specific heat capacity > thermal diffusion coefficient > thermal conductivity; the apparent activation energy of activated materials and carbonized materials is less than that of pressed materials, the oxidized spontaneous combustion tendency increases after carbonization and activation process.

Keywords

• coal-activated-based carbon
• characteristic temperature
• thermophysical properties
• thermal weight loss parameters
• apparent activation energy