| Author | Basak, Arun Kumar |
| Call Number | AIT Thesis no.ET-85-18 |
| Subject(s) | Coal gasification
|
| Note | A thesis submitted in partial fulfillment of requirements for the degree of Master of Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | Gas composition and temperature profiles for char coal gasified in the downdraft mode have been obtained from theoretical considerations. The prediction is based on kinetics a nd the heat and mass transfer mechanisms in an air-blown gasifier at atmospheric pressure. The charcoal has been assumed t o be pure carbon, i .e. free from volatile matter and ash. Parametric studies were made on so l id and gas £low rates, char reactivity and particle size, both with dry air and with steam in the system. The rate parameters used were those for anthracite coke taken f rom published literature , with appropriate reactivity corrections. Simplifications in the model assumptions included reaction at the particle surface only, combustion to from co2 as the primary effective product and a major part (70%) of t he heat of combustion being released n the gas phase. The results showed that o2 consumption took place very rapidly in a distance of about 10-15 ems from the level at which air entered, the co2 concentration dropped after increasing to a maximum, the CO and H2 concentrations continually increased from zero. The model predictions agreed qualitatively with the experimental results; the quantitative deviations being believed to be due to the uncertainty in the values of t he reaction rate parameters used for the model . |
| Year | 1985 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Energy Technology (ET) |
| Chairperson(s) | Bhattacharya, Sribas C. |
| Examination Committee(s) | Prida Wibulswas ;Stahl, Gunter |
| Scholarship Donor(s) | The King 's (Royal Thai Government) |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1985 |