Experimental and Modeling Study on Gasification of Millimeter Coal Char Particle Via Real-Time Measurement and Correction of Reaction Temperature

Accurate measurement of particle temperature is crucial for calculating the kinetic parameters of gas-solid reaction, and predicting the carbon conversion in gasifiers. In this study, an in-situ experiment of single coal particle gasification was conducted by the online temperature measurement system. The heat and mass transfer processes of the internal carbon core were modeled under the consideration of the ash layer, and the actual reaction temperature of the internal core was calculated. The results showed a gradual decrease in particle surface temperature from the periphery to the interior during the gasification process. Highly non-uniform temperature distributions exceeding 80 K on the surface of the reacting particles were observed. Calculation results showed the temperature of the internal carbon core was lower than the surface by 27 K to 72 K from 1173 K to 1373 K. A modified kinetic model was proposed based on the unreacted core temperature and the reaction area. Compared with the traditional model, the proposed model prediction demonstrated a better agreement with the experimental data, particularly in the initial and late stages.