Analysis on combustion and gasification characteristics of Datong coal in a CO2-rich atmosphere by different temperature gradient- Effect of oxygen concentration

Zhigang Li, Xiaoming Zhang, Yuichi Sugai, Jiren Wang, Kyuro Sasaki

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Current technical challenge for state-of-the-art coal power plants covers not only higher thermal efficiency, also lower CO2 emission or easier CO2 separation and capturing. One of expected technologies to achieve it, Integrated Gasification Combined Cycle (IGCC) has been developed. In this study, characteristics of combustion and gasification reactions for the Datong coal samples have been investigated using thermo gravimetric-differential thermal analysis (TG-DTA) under different O2 concentrations (≤ 5%) in a CO2-rich atmosphere by giving different heating and gas flow rates in the temperature range of 20 to 1400 °C. The samples of residual ash were subsequently analyzed by an Energy Dispersive Spectrum (EDS) analyzer to investigate Carbon molecular percentage, C%. The TG-DTA results, which were carried out under the coal temperature lower than 1000 °C, show that O 2 concentration (%) has a larger effect on C% in the residual ash. On the other hand, for the case of coal temperature over 1000 °C, C% has no strong dependency on O2% after gasification of the coal sample. Furthermore, a CO2 gas laser beam was used to carry out experiments of rapid heating of coal samples over the targeted temperature in a second under different O2 concentrations (≤10%) by circulating Air, N 2, CO2 or N2-CO2 mixing gases using with the circulating flow system. In the low O2 concentration range, the coal weight reduction decreases with increasing O2 concentration with a linear line and the weight reduction of rapid heating using with the laser beam is comparatively lower than that of TG-DTA. The present results might have great significance for the future of coal gasification power generation and coal seam underground coal gasification projects, etc.

Original languageEnglish
Pages (from-to)1252-1259
Number of pages8
JournalEnergy Procedia
Volume4
DOIs
Publication statusPublished - 2011

All Science Journal Classification (ASJC) codes

  • Energy(all)

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