Showing papers by "Preeti Aghalayam published in 2010"
TL;DR: In this article, the shape and size of the combustion cavity in underground coal gasification were investigated and the effect of various design and operating parameters such as the distance between the wells, feed flow rate and operation time on its evolution was investigated.
76 citations
15 Jul 2010
TL;DR: In this article, the authors present a brief overview of UCG Field Trials and Practice and a mathematical model for UCG field trials and practice, as well as an overview of the UCG Cavity.
Abstract: The sections in this article are
11.1
Introduction
11.2
Brief Overview of UCG Field Trials and Practice
11.3
Mathematical Models for UCG
11.3.1
Fundamental Studies Related to UCG
11.3.1.1
Chemical Reactions
11.3.1.2
Thermomechanical Spalling and Cavity Growth
11.3.1.3
Flow Patterns in the UCG Cavity
11.3.2
Process Models for UCG
11.3.2.1
Reactions-Based Models
11.3.2.2
Flow Pattern Based Models
11.3.2.3
Combination Models
11.4
Outlook
11.5
Summary
11.6
Acknowledgments
Keywords:
clean coal technology;
in situ gasification;
predictive models;
underground coal gasification
15 citations
TL;DR: In this paper, the catalysts were characterized using XRD, TEM, DRUV-VIS, N 2 sorption, SEM, TG/DTA and ICP analysis techniques.
Abstract: Molecular sieves MAPO-5 (M: Co, Ti, Cr and Fe) with the AFI structure type were prepared by the hydrothermal method. Noble metals (Pd, Rh, Ir and Ru) were deposited on the molecular sieve supports using the homogeneous deposition precipitation method. The catalysts were characterized using XRD, TEM, DRUV-VIS, N 2 sorption, SEM, TG/DTA and ICP analysis techniques. The PdO and RhO x species demonstrated small particle sizes as compared with other noble metals. The catalysts were evaluated for their performance in the reduction of NO by CO at different temperatures (150–500 °C) for a GHSV of 44,000 h −1 . Among the palladium and noble metals deposited catalysts, the PdCoAPO-5 and RhCoAPO-5 showed excellent performance. For the RhCoAPO-5 (Rh loading = 2.98% and Rh particle size = 2.2 nm) catalyst, the temperature required for complete NO reduction was 210 °C, which is lower than that required for PdCoAPO-5 (Pd loading = 2.96% and Pd particle size = 4 nm) and IrCoAPO-5 (Ir loading = 2.89% and Ir particle size = 6.5 nm) under identical conditions. The Rh deposited CoAPO-5 catalyst effectively operated at lower temperatures as compared with the other noble metal deposited CoAPO-5 catalysts studied here.
14 citations
TL;DR: In this paper, the authors explored the possibility of distributed temperature sensing using fiber Bragg gratings for the study of coal gasification and constructed a laboratory model to carry out such studies.
Abstract: We have explored the possibility of distributed temperature sensing using fiber Bragg gratings for the study of coal gasification. A laboratory model has been constructed to carry out such studies and the corresponding distributed temperature sensing results are reported.