Pumped carbon mining methane production process

Details Pumped carbon mining methane production process Pumped carbon mining methane production process

2006-03-31

2008-12-23

Bates, Zakiya W. (Department: 3676)

Wells

Processes

Separating material entering well

C166S309000, C166S272100, C166S302000, C166S266000, C048S127300, C048S213000

Reexamination Certificate

active

07467660

ABSTRACT:
The invention is a continuous process for producing methane from an underground coal bed or an above ground carbon-containing resource using hydrogen as a recycling working fluid. For an underground coal seam, the process includes injecting (220) hydrogen into the coal seam to form a reaction effluent of methane, hydrogen and carbon monoxide; extracting the reaction effluent (230) for processing above ground; cleaning the reaction effluent (120); cooling the cleaned reaction effluent (130) and processing it through a water gas shift reactor (140); separating (150) hydrogen, methane, and carbon dioxide into separate streams; producing the carbon dioxide stream (160) as a product gas; processing a first portion (170) of the methane stream in a steam reformer, water gas shift reactor and gas separator (180) to produce segregated flows of hydrogen and carbon dioxide, combining the segregated hydrogen flow with the separated hydrogen stream (190); heating and repressurizing (200) the combined hydrogen stream to the temperature and pressure of the hydrogen in the first step; producing a second portion (210) of said methane stream as a product gas; and injecting (220) the combined hydrogen stream into the underground coal bed to continue the process.

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Lambertz, et al., “Recent Operational Results of the High Temperature Winkler (HTW) and Hydrogasification (HKV) Process,” Second EPRI Conference on Synthetic Fuels in San Francisco, CA, Apr. 1985, all pages.
Steinberg, Underground Coal Gasification (UCG-Hydrocarb Process) for Producing a Clean Carbon Fuel and Hydrogen, Process Sciences Division, Brookhaven National Laboratory, BNL-39117, Dec. 1986, all pages.
Steinberg, et al., “Pumping Carbon and Hydrogen Out of the Ground Using the Underground Coal Hydrogasification Hydrocarb Process (UCHG-HCP),” 14th Annual Underground Coal Gasification Symposium, Chicago, Ill, Aug. 15-18, 1988, also Process Sciences Division, Brookhaven National Laboratory, BNL-41634, Jul. 1988, all pages.

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