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Research Papers: Hydrates/Coal Bed Methane/Heavy Oil/Oil Sands/Tight Gas

CBM Nitrogen Expansion Liquefaction Processes Using Residue Pressure of Nitrogen From Adsorption Separation

[+] Author and Article Information
Wensheng Lin

Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, Chinalinwsh@sjtu.edu.cn

Ting Gao, Anzhong Gu

Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, China

Min Gu

Department of Mining, Chongqing University, Chongqing 400044, China

J. Energy Resour. Technol 132(3), 032501 (Jun 23, 2010) (6 pages) doi:10.1115/1.4001799 History: Received September 29, 2008; Revised January 29, 2010; Published June 23, 2010; Online June 23, 2010

Coalbed methane (CBM) is a kind of important energy resources in the world. Liquefaction is a good option for recovery of CBM. Generally, CBM consists of a lot of nitrogen besides methane, which is usually required to be separated by adsorption before liquefaction, or by distillation after liquefaction. For the CBM adsorption-liquefaction processes, two novel processes are proposed, which integrate the two parts of adsorption and liquefaction together by utilizing the residue pressure of the waste nitrogen: the released nitrogen expanded directly to precool CBM or further compressed and then expanded to liquefy CBM. Taking the unit product liquefaction power consumption as the major index and the nitrogen content of CBM feed gas together with the residue pressure of waste nitrogen as variables, the system performance of these two integrated processes is studied and compared with that of the nitrogen expansion liquefaction process without integration. By simulation and calculation with HYSYS , it is confirmed that system power consumption can be reduced by both methods to utilize the residue pressure, and for CBM with high nitrogen content, the energy conservation effect is considerable; furthermore, it is better to use waste nitrogen to precool CBM than to liquefy it.

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Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Conventional liquefaction process via nitrogen expansion

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Figure 2

Liquefaction process with released nitrogen precooling

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Figure 3

Low residue pressure utilization liquefaction process

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Figure 4

High residue pressure utilization liquefaction process

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Figure 5

Unit power consumption for scheme 1 and ordinary process

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Figure 6

Temperature of CBM after precooling

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Figure 7

Molar flow rate of nitrogen used for liquefying CBM

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Figure 8

Unit power consumption for scheme 2 and ordinary process

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Figure 9

Molar flow rate of total working fluid for liquefaction

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Figure 10

Temperature of working fluid after combination

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Figure 11

Molar flow rate of total liquefaction fluid and circulating fluid

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Figure 12

Nitrogen content of liquefaction fluid at different nitrogen content of CBM feed gas

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Figure 13

Comparison of unit power consumption when residue pressure is 4000 kPa

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Figure 14

Patterns of exergy lost for each process

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