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Research Papers: Gas Turbines: Coal, Biomass, and Alternative Fuels

A New Kind of Multifunctional Energy System Based on Moderate Conversion of Chemical Energy of Fossil Fuels

[+] Author and Article Information
Wei Han

Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, Chinahanwei@mail.etp.ac.cn

Hongguang Jin

Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, Chinahgjin@mail.etp.ac.cn

J. Eng. Gas Turbines Power 132(5), 051401 (Mar 04, 2010) (8 pages) doi:10.1115/1.3205025 History: Received April 07, 2009; Revised April 10, 2009; Published March 04, 2010; Online March 04, 2010

This paper proposes a new kind of multifunctional energy system (MES) using natural gas and coal to more efficiently and more economically produce methanol and power. Traditional chemical processes pursue high conversion ratios of chemical energy of fuels. The new MES focuses on the moderate conversion of the chemical energy of fuels. To do this, about 50% of the coal is partially gasified with pure oxygen and steam as oxidant, and then the unconverted residuals (char) and natural gas are utilized synthetically by char-fired reforming to generate syngas. The combustion of char drives the methane/steam-reforming reaction. Here, the reforming reaction is also moderately converted, and the reforming temperature is decreased 100150°C compared with that of the conventional method. The carbon-rich syngas from the partial gasifier of coal and hydrogen-rich syngas from char-fired reformer are mixed together and converted into methanol at a proper conversion ratio (lower than that of the conventional chemical process). Finally, the unconverted syngas is used in a combined cycle as fuel for power generation. As a result, the total exergy efficiency of the new system is 55–60%. Comparing to individual systems, including the integrated gasification combined cycle and the natural gas-based methanol synthesis plants, this new system can generate 10–20% more electricity with the same quantity of fossil fuel input and methanol output. In addition, the possibility of reducing the size of gasifier, reformer, and methanol synthesis reactor may reduce investment costs accordingly. These results may provide a new way to use coal and natural gas more efficiently and economically.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of the multifunctional energy system with moderate conversion of coal and natural gas

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Figure 2

System configuration of the new MES with moderate conversion of chemical energy of coal and natural gas

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Figure 3

(a) EUD for partial gasification and (b) EUD for full gasification

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Figure 4

(a) EUD for char-fired partial reformer and (b) EUD for conventional reformer

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Figure 5

(a) EUD for methanol synthesis in MES and (b) EUD for methanol synthesis in MSN

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