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ABSTRACT
The influences of active alkali and alkaline earth metals (Ac-AAEMs) on the physicochemical properties of chars during co-pyrolysis-gasification coupling were studied in this paper. The mixed samples were obtained according to four mixing ways: original coal and original corn stovers (OSM+OCS), pickling coal and original corn stovers (PSM+OCS), original coal and pickling corn stovers (OSM+PCS), and pickling coal and pickling corn stovers (PSM+PCS). The influences of Ac-AAEMs in OSM (Ac-AAEMs-OSM), Ac-AAEMs in OCS (Ac-AAEMs-OCS), and Ac-AAEMs in OSM+OCS (Ac-AAEMs-blends) on the pore structures of gasification chars were characterized by IOSM, IOCS, and IOSM+OCS, respectively. The results showed that Ac-AAEMs-OCS and Ac-AAEMs-blends, especially Ac-AAEMs-OCS, significantly promoted the development of mesopores. Furthermore, Ac-AAEMs-OCS and Ac-AAEMs-blends have good catalytic effects on the specific surface area of chars, especially at 20 minutes of gasification. Compared with PSM+PCS char, the specific surface areas of PSM+OCS char, OSM+OCS char, and OSM+PCS char obtained at 20 minutes of gasification increased by 203%, 157%, and 7%, respectively. Besides, the Ac-AAEMs are conducive to destroying the carbon structure with a high graphitization degree and promoting the formation of disordered amorphous carbon. The magnitude of their catalytic ability is Ac-AAEMs-blends >Ac-AAEMs-OCS>Ac-AAEMs-OSM.
Nomenclature
| Ac-AAEMs | = | active alkali and alkaline earth metals |
| Ac-AAEMs-OSM | = | active alkali and alkaline earth metals in original coal |
| Ac-AAEMs-OCS | = | active alkali and alkaline earth metals in original corn stovers |
| Ac-AAEMs-blends | = | active alkali and alkaline earth metals in original coal and original corn stovers |
| A(Gr+VI+Vr)/AD | = | the ratio of small aromatic ring systems to large aromatic ring systems |
| AD/AG | = | the ratio of large aromatic ring systems to graphite structures |
| FFCRS | = | fixed-bed/fluidized-bed combination reactor system |
| IOCS | = | the adsorption increments ratios of PSM+OCS char to PSM+PCS char |
| IOSM | = | the adsorption increments ratios of OSM+PCS char to PSM+PCS char |
| IOSM+OCS | = | the adsorption increments ratios of OSM+OCS char to PSM+PCS char |
| L-Mesopores | = | mesopores with a larger pore size |
| OCS | = | original corn stovers |
| OSM | = | original coal |
| OSM+OCS | = | original coal and original corn stovers |
| OSM+PCS | = | original coal and pickling corn stovers |
| PCS | = | pickling corn stovers |
| PSM | = | pickling coal |
| PSM+PCS | = | pickling coal and pickling corn stovers |
| PSM+OCS | = | pickling coal and original corn stovers |
| S-Mesopores | = | mesopores with a smaller pore size |
Disclosure statement
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
The authors declare the following financial interests/personal relationships which may be considered as potential competing interests.
Supplementary material
Supplemental data for this article can be accessed online at https://doi.org/10.1080/15567036.2022.2120575