Date of Award
Master of Science (MS)
In the field of energy generation, coal gasification is one of the burgeoning technologies that are becoming an attractive alternative to conventional coal conversion. This study will provide valuable data to aid in optimizing and understanding this type of technology, in particular the char reactions of a transport coal gasifier that utilizes the M. W. Kellogg process. It has been very difficult to develop an accurate model for this process due to the lack of kinetic/equilibrium data of the coal char re-bum reaction and its effects on the gasification process.
Char reaction data on carbon monoxide (CO) and carbon dioxide (CO2) production as well as kinetic equations were developed as a function of the primary control variables: oxygen-to-carbon ratios, temperature, coal type, and water content. Bench scale tests were preformed using a pressurized fluidized bed reactor (PFBR) to simulate the conditions of a transport gasifier. From these experiments qualitative data on CO and CO2 production of the coal chars have been generated as a function of temperature, oxygen-to-carbon ratios, and fuel types. Also quantitative tests were preformed using a thermogravimetric analyzer (TGA) to generate kinetic equations as well as analyze the effects of steam injection. Utilizing these two analysis techniques, a better understanding of the gasification process as it relates to the interaction with the coal char re-burn was developed.
Jacobsen, Jason P., "Char Reaction Kinetics in a Transport Gasifier" (2001). Theses and Dissertations. 900.