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Research Papers: Fuel Combustion

Novel Coal-Steam Gasification With a Thermochemical Regenerative Process for Power Generation

[+] Author and Article Information
Dandan Wang

Institute of Engineering Thermophysics,
Chinese Academy of Science,
11 Beisihuanxi Road,
Beijing 100190, China;
University of Chinese Academy of Science,
No. 19(A) Yuquan Road,
Beijing 100049, China
e-mail: wangdandan@iet.cn

Sheng Li

Institute of Engineering Thermophysics,
Chinese Academy of Science,
11 Beisihuanxi Road,
Beijing 100190, China;
University of Chinese Academy of Science,
No. 19(A) Yuquan Road,
Beijing 100049, China
e-mail: lisheng@iet.cn

Lin Gao

Institute of Engineering Thermophysics,
Chinese Academy of Science,
11 Beisihuanxi Road,
Beijing 100190, China;
University of Chinese Academy of Science,
No. 19(A) Yuquan Road,
Beijing 100049, China
e-mail: gaolin@iet.cn

Handong Wu

Institute of Engineering Thermophysics,
Chinese Academy of Science,
11 Beisihuanxi Road,
Beijing 100190, China;
University of Chinese Academy of Science,
No. 19(A) Yuquan Road,
Beijing 100049, China
e-mail: wuhandong@iet.cn

Hongguang Jin

Institute of Engineering Thermophysics,
Chinese Academy of Science,
11 Beisihuanxi Road,
Beijing 100190, China;
University of Chinese Academy of Science,
No. 19(A) Yuquan Road,
Beijing 100049, China
e-mail: hgJin@iet.cn

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received January 4, 2018; final manuscript received April 7, 2018; published online May 7, 2018. Assoc. Editor: Abel Hernandez-Guerrero.

J. Energy Resour. Technol 140(9), 092203 (May 07, 2018) (9 pages) Paper No: JERT-18-1010; doi: 10.1115/1.4039978 History: Received January 04, 2018; Revised April 07, 2018

In this paper, a novel high-efficiency coal gasification technology is proposed in which a regenerative unit is applied to recover syngas sensible heat to generate steam; then, the high-temperature steam is used to gasify coke from a pyrolyzer. Through such a thermochemical regenerative unit, the sensible heat with a lower energy level is upgraded into syngas chemical energy with a higher energy level; therefore, high cold gas efficiency (CGE) is expected from the proposed system. aspenplus software is selected to simulate the novel coal gasification system, and the key parameters are validated by experimentation. Then energy, exergy, and energy-utilization diagram (EUD) analyses are applied to disclose the plant performance enhancement mechanism. It is revealed that 83.2% of syngas sensible heat can be recovered into steam agent with the CGE upgraded to 90%. In addition, with the enhancement of CGE, the efficiency of an integrated gasification combined cycle (IGCC) based on the novel gasification system can be as high as 51.82%, showing a significant improvement compared to 45.2% in the general electric company (GE) gasification-based plant. In the meantime, the irreversible destruction of the gasification procedure is reduced to 25.7% through thermochemical reactions. The increase in the accepted energy level (Aea) and the decreases in the released energy level (Aed) and heat absorption (ΔH) contribute to the reduction in exergy destruction in the gasification process. Additionally, since the oxygen agent is no longer used in the IGCC, 34.5 MW exergy destruction in the air separation unit (ASU) is avoided.

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Figures

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Fig. 1

Development history of the CGE of coal gasification technologies

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Fig. 2

(a) Heat flow diagram of traditional gasification and (b) heat flow diagram of proposed gasification with thermochemical regenerative process

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Fig. 3

(a) Simplified flow diagram of novel IGCC system and (b) simplified flow diagram of reference system

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Fig. 4

Compositions of syngas in GE and novel system

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Fig. 7

Power output of GT/ST and thermal performances

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Fig. 5

Utilization of syngas sensible heat

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Fig. 6

Percentage of heating coal and LHV of syngas

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Fig. 8

(a) EUD of gasification process in the reference system and (b) EUD of gasification process in the novel system

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