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Research Papers: Gas Turbines: Electric Power

System Study on Partial Gasification Combined Cycle With CO2 Recovery

[+] Author and Article Information
Yujie Xu

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

Hongguang Jin

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

Rumou Lin, Wei Han

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

J. Eng. Gas Turbines Power 130(5), 051801 (Jun 17, 2008) (9 pages) doi:10.1115/1.2938273 History: Received July 19, 2006; Revised April 02, 2008; Published June 17, 2008

A partial gasification combined cycle with CO2 recovery is proposed in this paper. Partial gasification adopts cascade conversion of the composition of coal. Active composition of coal is simply gasified, while inactive composition, that is char, is burnt in a boiler. Oxy-fuel combustion of syngas produces only CO2 and H2O, so the CO2 can be separated through cooling the working fluid. This decreases the amount of energy consumption to separate CO2 compared with conventional methods. The novel system integrates the above two key technologies by injecting steam from a steam turbine into the combustion chamber of a gas turbine to combine the Rankine cycle with the Brayton cycle. The thermal efficiency of this system will be higher based on the cascade utilization of energy level. Compared with the conventional integrated gasification combined cycle (IGCC), the compressor of the gas turbine, heat recovery steam generator (HRSG) and gasifier are substituted for a pump, reheater, and partial gasifier, so the system is simplified obviously. Furthermore, the novel system is investigated by means of energy-utilization diagram methodology and provides a simple analysis of their economic and environmental performance. As a result, the thermal efficiency of this system may be expected to be 45%, with CO2 recovery of 41.2%, which is 1.5–3.5% higher than that of an IGCC system. At the same time, the total investment cost of the new system is about 16% lower than that of an IGCC. The comparison between the partial gasification technology and the IGCC technology is based on the two representative cases to identify the specific feature of the proposed system. The promising results obtained here with higher thermal efficiency, lower cost, and less environmental impact provide an attractive option for clean-coal utilization technology.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Plant scheme of the partial gasification combined cycle with CO2 recovery; A-gasifier; B-syngas cooler; C-cyclone; D-hydrolyzer, E-dry desulfurizer; F-scrubber; G-waste-disposal unit; H-combustion chamber; I-HTT; J-reheater; K-LTT; L-condenser; M-compressor; N-refrigeration machine; O-pump; P-reheater; Q-pump; R-boiler; S-compressor; T-ASU; U-compressor; V-HPT; W-deaerator; X-pump

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Figure 2

Variation of thermal efficiency with T30 and ε of the HTT

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Figure 3

Variation of thermal efficiency with GCCR and ε

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Figure 4

Variation of thermal efficiency with T0 and P0 of the HPT

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Figure 5

The simplified flow chart of the IGCC system

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Figure 6

(a) EUDs for the gasification subsystem of IGCC. (b) EUDs for the gasification subsystem of the new system.

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Figure 7

(a) EUDs for the combustion subsystem of IGCC. (b) EUDs for the combustion subsystem of the new system.

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Figure 8

(a) EUDs for the heat-exchange subsystem of IGCC. (b) EUDs for the heat-exchange subsystem of the new system.

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Figure 9

(a) EUDs for the power subsystem of IGCC. (b) EUDs for the power subsystem of the new system.

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Figure 10

The flow chart of the IGCC with a semiclosed O2∕CO2 cycle

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Figure 11

Variation of the thermal efficiency of the new system and semiclosed IGCC with CO2 recovery with XCO2 and T30

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