Sensitivity and firing strategy study of pulverized-coal combustion in a one-dimensional test case

摘要

An account is given in this report of a sensitivity study comprising 57 cases and a firing strategy study comprising 24 cases on a one-dimensional test furnace for pulverized-coal combustion performed with the 3D numerical computer code FYRSYS. Results for each case are presented as profiles of gas temperature, unburned char, species concentrations of oxygen, water and carbon dioxide, absorption coefficients and thermal radiative net heat absorption on the walls. The sensitivity study shows, within the parameter variation range used here, that the most important parameters are those concerning devolatilization, volatile burn rates, gas heat capacity, grid fineness close to the burner and particle sizes. The firing strategy study includes a study of load, coal/air ratios, pre-heat temperature, coal type, coal blend and grinding. In all cases the computer model is able to respond as expected and may therefore be regarded as a reliable tool for studying firing strategies in more complex cases, as well as in three-dimensional cases. (au) 10 refs.