The combustion kinetics of waste capsicum stalk (WCS) in Western China is investigated through thermogravimetric analysis compared with sawdust and coal, and co-combustion of WCS with coal is also investigated. Results show that the ignition characteristics of WCS is better than that of sawdust and coal, and the activation energy E of WCS-volatile combustion and WCS-char combustion are 78.55 kJ mol−1 and 44.59 kJ mol−1. However, integrating the characteristics of ignition and burnout, the combustion characteristic factor (SN) of WCS is lower than that of sawdust. With the increasing in the heating rate, the ignition of WCS is delayed. Oxygen concentration affects E and k0 of volatile combustion largely under rich-oxygen condition, when increases from 0.2 to 0.8, E has increased threefold and k0 also intensively increases from 106 to 1013–1022. Oppositely, effect of on the E and k0 of char combustion is little, and there is an exponential relationship between SN and . For the tests of co-combustion, all the experimental and weighted-average curves coincide well, and there is no remarkable synergistic effect. With the increase of mixing ratio that WCS added, E and k0 of volatile combustion increase, but correspondingly E and k0 of char combustion decrease.
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