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Research Papers: Gas Turbines: Industrial & Cogeneration

Proposal of a Novel Multifunctional Energy System for Cogeneration of Coke, Hydrogen, and Power

[+] Author and Article Information
Hongguang Jin

Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, P.R.C.hgjin@mail.etp.ac.cn

Shien Sun

Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, P.R.C.; Graduate University of Chinese Academy of Sciences, Beijing 100190, P.R.C.sunshien@gmail.com

Wei Han, Lin Gao

Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, P.R.C.

J. Eng. Gas Turbines Power 131(5), 052001 (May 26, 2009) (8 pages) doi:10.1115/1.3078791 History: Received September 08, 2008; Revised September 23, 2008; Published May 26, 2009

This paper proposes a novel multifunctional energy system (MES), which cogenerates coke, hydrogen, and power, through the use of coal and coke oven gas (COG). In this system, a new type of coke oven, firing coal instead of COG as heating resource for coking, is adopted. The COG rich in H2 is sent to a pressure swing adsorption (PSA) unit to separate about 80% of hydrogen first, and then the PSA purge gas is fed to a combined cycle as fuel. The new system combines the chemical processes and power generation system, along with the integration of chemical conversion and thermal energy utilization. In this manner, both the chemical energy of fuel and thermal energy can be used more effectively. With the same inputs of fuel and the same output of coking heat, the new system can product about 65% more hydrogen than that of individual systems. As a result, the thermal efficiency of the new system is about 70%, and the exergy efficiency is about 66%. Compared with individual systems, the primary energy saving ratio can reach as high as 12.5%. Based on the graphical exergy analyses, we disclose that the integration of synthetic utilization of COG and coal plays a significant role in decreasing the exergy destruction of the MES system. The promising results obtained may lead to a clean coal technology that will utilize COG and coal more efficiently and economically.

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Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

(a) Conventional coking process and (b) novel coking process

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Figure 2

Flow diagram of the new MES system

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Figure 3

Utilization of COG and coal in reference systems

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Figure 4

(a) EUD for combustion of coal in coal-fired coke oven and (b) EUD for combustion of COG and gasification of coal in reference systems

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Figure 5

(a) EUD for the combustion of purge gas in MES system and (b) EUD for combustion of purge gas and syngas in reference systems

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Figure 6

(a) EUD for heat exchanges in MES system and (b) EUD for exchanges in reference systems

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