Forward and reverse combustion linking in underground coal gasification

Blinderman, Michael S.; Saulov, D. N.; Klimenko, A. Y.

doi:10.1016/j.energy.2007.10.004

Cited by 64 publications

(34 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The upper branch is also not stable -it is affected by the hydrodynamic instability that is less severe than the pulsating instability. Our assessment of the stability of RCL is, generally, in agreement with the other works on reverse combustion [1,5,6,11]. The details of the stability analysis are given in the Appendix.…”

Section: The Planar Flame Speedsupporting

confidence: 74%

Theory of reverse combustion linking

Blinderman¹,

Klimenko

2007

Combustion and Flame

View full text Add to dashboard Cite

The present work suggests a theory of Reverse Combustion Linking (RCL). RCL is a central unit operation of Underground Coal Gasification (UCG) technology. The theory is based on analysing stability of different branches of the propagation speed curves and determining the regime that is responsible for propagation of the flame during RCL. The theory is in a good qualitative and quantitative agreement with the data obtained in practical use of RCL in UCG operations.

show abstract

Section: The Planar Flame Speedsupporting

confidence: 74%

Theory of reverse combustion linking

Blinderman¹,

Klimenko

2007

Combustion and Flame

View full text Add to dashboard Cite

show abstract

“…In a typical UCG process, two boreholes are drilled into the coal seam, connected by an underground gasification gallery created using various linking techniques [24][25][26] at proper distance apart. With development of the UCG technology, plenty of design approaches have taken place in the structure of the underground reactor.…”

Section: Experimental Designmentioning

confidence: 99%

Evaluation of Structural Changes in the Coal Specimen Heating Process and UCG Model Experiments for Developing Efficient UCG Systems

Nakanowataru

Itakura

et al. 2013

Energies

View full text Add to dashboard Cite

Abstract:In the underground coal gasification (UCG) process, cavity growth with crack extension inside the coal seam is an important phenomenon that directly influences gasification efficiency. An efficient and environmentally friendly UCG system also relies upon the precise control and evaluation of the gasification zone. This paper presents details of laboratory studies undertaken to evaluate structural changes that occur inside the coal under thermal stress and to evaluate underground coal-oxygen gasification simulated in an ex-situ reactor. The effects of feed temperature, the direction of the stratified plane, and the inherent microcracks on the coal fracture and crack extension were investigated using some heating experiments performed using plate-shaped and cylindrical coal specimens. To monitor the failure process and to measure the microcrack distribution inside the coal specimen before and after heating, acoustic emission (AE) analysis and X-ray CT were applied. We also introduce a laboratory-scale UCG model experiment conducted with set design and operating parameters. The temperature profiles, AE activities, product gas concentration as well as the gasifier weight lossess were measured successively during gasification. The product gas mainly comprised combustible components such as CO, CH 4 , OPEN ACCESSEnergies 2013, 6 2387 and H 2 (27.5, 5.5, and 17.2 vol% respectively), which produced a high average calorific value (9.1 MJ/m 3 ).

show abstract

“…The second UCG experiment, which was also conducted using chamber method, commenced on November, 29,1933 at Shakhty in Donetsk coal basin [25]. Instrumentation was significantly improved in this experiment.…”

Section: First Soviet Ucg Trialsmentioning

confidence: 99%

“…Although the Lisichansk experiment was prepared and conducted at an incomparably higher technological level that the experiments at Krutova, it did not result in a controlled UCG since the UCG process conducted in these experiments can not be controlled in principle. This process used forward combustion, which, as shown in reference [29], has instabilities. These instabilities resulted in fragmented combustion zones separated by colder areas.…”

Section: First Soviet Ucg Trialsmentioning

confidence: 99%

Early Ideas in Underground Coal Gasification and Their Evolution

Klimenko

2009

Energies

View full text Add to dashboard Cite

This article follows the development of early UCG (underground coal gasification) ideas. Historical facts are discussed mainly from the technological perspective and early experiments in UCG are analyzed. Our search for the first successful UCG experiment brings to light a new finding, which was commonly overlooked in previous reviews. We also outline the key role that engineer and inventor A. G. Betts played in introducing technologies utilizing unmined coal; his original ideas are visible in the first successful UCG experiments and in modern UCG technology.

show abstract

Forward and reverse combustion linking in underground coal gasification

Cited by 64 publications

References 20 publications

Theory of reverse combustion linking

Theory of reverse combustion linking

Evaluation of Structural Changes in the Coal Specimen Heating Process and UCG Model Experiments for Developing Efficient UCG Systems

Early Ideas in Underground Coal Gasification and Their Evolution

Contact Info

Product

Resources

About