کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1735140 1016172 2011 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Laboratory studies on cavity growth and product gas composition in the context of underground coal gasification
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی (عمومی)
پیش نمایش صفحه اول مقاله
Laboratory studies on cavity growth and product gas composition in the context of underground coal gasification
چکیده انگلیسی

Systematic laboratory scale experiments on coal blocks can provide significant insight into the underground coal gasification (UCG) process. Our earlier work has demonstrated the various features of the early UCG cavity shape and rate of growth through lab-scale experiments on coal combustion, wherein the feed gas is oxygen. In this paper, we study the feasibility of in situ gasification of coal in a similar laboratory scale reactor set-up, under conditions relevant for field practice of UCG, using an oxygen–steam mixture as the feed gas. By performing the gasification reaction in a cyclic manner, we have been able to obtain a product gas with hydrogen concentrations as high as 39% and a calorific value of 178 kJ/mol. The effect of various operating parameters such as feed temperature, feed steam to oxygen ratio, initial combustion time and so on, on the product gas composition is studied and the optimum operating conditions in order to achieve desired conversion to syngas, are determined. We also study the effect of various design and operating parameters on the evolution of the gasification cavity. Empirical correlations are proposed for the change in cavity volume and its dimensions in various directions. The results of the previous study on the combustion cavity evolution are compared with this gasification study.

Research highlights
► Proposed a systematic methodology to mimic the UCG process in the lab-scale.
► Identified possible factors that influence thermo-mechanical spalling of coal.
► Proposed optimum operating conditions in order to obtain maximum gasification yield.
► Captured the shape of cavity and its growth in all directions.
► Compared combustion cavity growth with that of gasification.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Energy - Volume 36, Issue 3, March 2011, Pages 1776–1784
نویسندگان
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