(2017) Journal of CO2 Utilization_Strategic use of CO2 for co-pyrolysis of swine manure and coal for energy recovery and waste disposal

Lee S.-R., Lee J., Lee T., Tsang Y.F., Jeong K.-H., Oh J.-I., Kwon E.E.

(Elsevier Ltd) Journal of CO2 Utilization ISSN: 22129820 Vol.22 Issue. Article No. DOI: 10.1016/j.jcou.2017.09.018

Here in this study, the genuine role of CO₂ 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 CO₂ co-feeding impact on any reactions (≤740 °C) between CO₂ and the sample surface (i.e., heterogeneous reaction) should be excluded. A batch-type co-pyrolysis revealed two genuine CO₂ co-feeding impacts on co-pyrolysis of swine manure and coal. First, CO₂ can be an additional source for C and O through a plausible reaction between pyrolytic oil and CO₂, which led to the enhanced generation of CO by the conversion of volatile organic carbons (VOCs) evolved from thermal deconstruction of pyrolytic substrate. Second, CO₂ expedite the thermal cracking of VOCs, which also resulted in the more generation of H₂ and CH₄. Two genuine roles of CO₂ 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.

This work was supported by a National Research Foundation of Korea (NRF) Grant funded by the Korean Government (Ministry of Education, Science and Technology (MEST)) (No. NRF-2017R1D1A1B03028176 ).