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Evaluation method of the energy conversion efficiency of coal gasification and related applications
Author(s) -
Duan Tianhong,
Lu Caiping,
Xiong Sheng,
Fu Zhenbing,
Zhang Bo
Publication year - 2016
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.3444
Subject(s) - underground coal gasification , coal gasification , coal , process engineering , efficient energy use , energy conversion efficiency , environmental science , clean coal technology , waste management , integrated gasification combined cycle , syngas , electricity generation , engineering , power (physics) , chemistry , thermodynamics , hydrogen , physics , organic chemistry , electrical engineering
Summary Traditional gasification parameters, such as cold gas efficiency, hot gas efficiency, or thermal efficiency, only evaluate the heat energy utilisation efficiency of gasifiers and do not take into account the gasification processes expending electricity and other types of energies. Therefore, the energy conversion efficiency cannot be assessed using these parameters. The calculation process on the energy conversion efficiency of underground coal gasification (UCG) is the basis for obtaining quantitative data of carbon emission reduction and establishing the carbon trading methodology of UCG. Moreover, the energy conversion efficiency both for surface coal gasification and UCG is a key research topic because it directly affects the economic and environmental benefits of gasification projects. This study proposed that two parameters, the integrated gasification efficiency ( h com ) and the hot gas integrated gasification efficiency ( h c o m ′ ), should be included into the coal gasification parameters and used to evaluate the energy conversion efficiency of coal gasification. In addition, the calculation methods of these two parameters for both surface gasification and UCG were established. Using the method, h com and h c o m ′ , of the UCG and Texaco gasification under the same scale was compared and that of various UCG processes was calculated. The results proved the necessity and reasonability of the two parameters and suggested that a certain amount of CO 2 was favourable to improve h com and h c o m ′ of UCG. However, a certain amount of pure O 2 can improve h com of UCG without direct influences on h c o m ′ . Under the condition of each process, to maximise h com and h c o m ′ , there must be an optimal steam (CO 2 ) to O 2 rate. Copyright © 2015 John Wiley & Sons, Ltd.