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Research Papers: Gas Turbines: Cycle Innovations

A Novel Coal-Based Hydrogen Production System With Low CO2 Emissions

[+] Author and Article Information
Gang Xu, YongPing Yang, Liqiang Duan

Beijing Key Laboratory of Energy Safety and Clean Utilization, Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education, School of Energy and Power Engineering, North China Electric Power University, Beijing 102206, China

HongGuang Jin

Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100080, Chinahgjin@mail.etp.ac.cn

Wei Han, Lin Gao

Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100080, China

J. Eng. Gas Turbines Power 132(3), 031701 (Dec 02, 2009) (9 pages) doi:10.1115/1.3159369 History: Received March 22, 2009; Revised April 05, 2009; Published December 02, 2009; Online December 02, 2009

In this paper, we have proposed a novel coal-based hydrogen production system with low CO2 emission. In this novel system, a pressure swing adsorption H2 production process and a CO2 cryogenic capture process are well integrated to gain comprehensive performance. In particular, through sequential connection between the pressure swing absorption (PSA) H2 production process and the CO2 capture unit, the CO2 concentration of PSA purge gas that enters the CO2 capture unit can reach as high as 70%, which results in as much as 90% of CO2 to be separated from mixed gas as liquid at a temperature of 55°C. This will reduce the quantity and quality of cold energy required for cryogenic separation method, and the solidification of CO2 is avoided. The adoption of cryogenic energy to capture CO2 enables direct production of liquid CO2 at low pressure and thereby saves a lot of compression energy. Besides, partial recycle of the tail gas from CO2 recovery unit to PSA inlet can help enhance the amount of hydrogen product and lower the energy consumption for H2 production. As a result, the energy consumption for the new system’s hydrogen production is only 196.8GJ/tH2 with 94% of CO2 captured, which is 9.2% lower than that of the coal-based hydrogen production system with Selexol CO2 removal process and is only 2.6% more than that of the coal-based hydrogen production system without CO2 recovery. More so, the energy consumption of CO2 recovery is expected to be reduced by 20–60% compared with that of traditional CO2 separation processes. Further analysis on the novel system indicates that synergetic integration of the H2 production process and cryogenic CO2 recovery unit, along with the synthetic utilization of energy, plays a significant role in lowering energy penalty for CO2 separation and liquefaction. The promising results obtained here provide a new approach for CO2 removal with low energy penalty.

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References

Figures

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Figure 1

Flow diagram of single production processes

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Figure 2

Integrated process of clean fuel production and CO2 separation

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Figure 3

Variation in CO2 and separation ratio of CO2/H2 mixed gas with its temperature

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Figure 4

CHP system with Selexol CO2 capture process

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Figure 5

New CHP system with cryogenic CO2 recovery

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Figure 6

Temperature and quantity of cryogenic energy required for separating 1 kmol/s CO2 from mixed gases with different CO2 concentrations

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Figure 7

Flow diagram of cryogenic CO2 recovery process

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Figure 8

Impact of recycle ratio on H2 yield and CO2 recovery ratio

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Figure 9

Impact of recycle ratio on mole flow rate and H2 concentration of key streams

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Figure 10

Impact of recycle ratio on equivalent energy consumption for H2 production

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