Strategic use of CO2 for co-pyrolysis of swine manure and coal for energy recovery and waste disposal.

Here in this study, the genuine role of CO 2 in co-pyrolysis of swine manure and coal was mainly investigated to increase the thermal efficiency of the thermo-chemical process. The TGA test of swine manure and coal revealed that the CO 2 co-feeding impact on any reactions (≤740 °C) between CO 2 and the sample surface ( i.e., heterogeneous reaction) should be excluded. A batch-type co-pyrolysis revealed two genuine CO 2 co-feeding impacts on co-pyrolysis of swine manure and coal. First, CO 2 can be an additional source for C and O through a plausible reaction between pyrolytic oil and CO 2 , which led to the enhanced generation of CO by the conversion of volatile organic carbons (VOCs) evolved from thermal deconstruction of pyrolytic substrate. Second, CO 2 expedite the thermal cracking of VOCs, which also resulted in the more generation of H 2 and CH 4 . Two genuine roles of CO 2 in co-pyrolysis of swine manure and coal occurred independently. All experimental findings will be directly applicable to the gasification process since pyrolysis is an intermediate step for the gasification. [ABSTRACT FROM AUTHOR]