00/03005 Domestic energy efficiency in Ireland: correcting market failure
- Publisher
- Elsevier Science
- Year
- 2000
- Weight
- 207 KB
- Volume
- 41
- Category
- Article
- ISSN
- 0140-6701
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✦ Synopsis
17 Energy (supplies, policy, economics, forecasts) feature of these lignites is the large amount of jarosite observed which is likely to have volcanic origin. Pyrite is the other iron-bearing mineral observed. The decomposition of these minerals on combustion is studied by Mossbauer experiments on samples heated at different temperatures.
The decomposition route is significantly different from those normally found in coal samples. Early rupture of the polymer matrix and repulsion of hydrogen seems to have a major role in deciding the decomposition route.
00/02996
Mathematical model of coke-carried-heat gasification coal-fired combined cycle Zhao, L. and Xu, X. Gongcheng Ren& Xurhao, 1999, 20, (I), 26-29. (In Chinese) Coal-fired combined cycle has drawn much attention over the years due to it being a high efficiency and low pollution combustion technology. As a result, it has been developed quickly all over the world during the last several years. A novel combined cycle system was put forward by Thermal Engineering Department of Tsinghua University in 1992. The improved type of the system now is named coke-carried-heat gasification coal-fired combined cycle, in which gasification chamber was moved from the boiler inside to outside as a separate gasifier and the coke is used as the gasification heat source. In this paper a complete steady-state mathematical model of the combined cycle has been attempted, adopting the cell model and modular method and according to the characteristic of the different components.
00/02997
Mathematical modelling of pyrolysis of large coal particles-estimation of kinetic parameters for methane evolution Heidenreich, C. A. et crl. Fuel, 1999. 78, (5), 557-566. The distributed activation energy model is used in this paper to study the mathematical modelling of large coal particle-pyrolysis.
The test results were compared with experimental data in the literature and it is apparent that the model is effective in predicting the temperature response and the residual volatile matter content of large particles undergoing pyrolysis in both fluidized-bed and convective heating conditions. The model is further used to investigate the proposed kinetic parameters for methane evolution and suggests that incorrect assumptions in previous modelling attempts resulted in the selection of inappropriate kinetic parameters. Alternative kinetic parameters are suggested which give significantly better predictions for the evolution of methane under fluidized-bed conditions for both large and pulverized coal particles. The model predictions are shown to be more sensitive to the kinetics than the heat transfer coefficient, which suggests that the pyrolysis of the large coal particles is primarily kinetically controlled.