Investigation of Combustion Kinetic Cooking Oil Tar Samples with Thermogravimetric Analysis

The cooking fire not only brought huge economic losses and adverse social impact. The combustible material of fire in fog discharge pipe is the cooking oil tar. In order to solve the problem of fire in fog discharge pipe, it is necessary to research the combustion characteristics of cooking oil tar and design feasible automatic fire alarm system and fire-extinguishing system. Test of the combustion characteristics of cooking oil tar in pipe was conducted with a thermo gravimetric analyzer TG209C under five heating rates of 5, 10, 15, 20 and 25□/min respectively. In the test, sweeping gas was dry air with a flow rate of 20mL/min. Experimental results showed that the weight loss of cooking oil tar can be divided into five stages. The first stage is the process of water separation and the late four stages are the combustion processes at various speed. A simple kinetic description, named in this work as `First Order Reaction and Three-dimensional Diffusion Separate-stage Model (O1+D3)´, is developed based on the experimental results and integral analysis method. The model was proved to be reliable by experimental TG cures.