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Title: System and method for producing substitute natural gas from coal

Abstract

The present invention provides a system and method for producing substitute natural gas and electricity, while mitigating production of any greenhouse gasses. The system includes a hydrogasification reactor, to form a gas stream including natural gas and a char stream, and an oxygen burner to combust the char material to form carbon oxides. The system also includes an algae farm to convert the carbon oxides to hydrocarbon material and oxygen.

Inventors:
 [1]
  1. Avondale, AZ
Publication Date:
Research Org.:
National Energy Technology Lab. (NETL), Pittsburgh, PA, and Morgantown, WV (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1061450
Patent Number(s):
8,236,072
Application Number:
12/084,845
Assignee:
Arizona Public Service Company (Phoenix, AZ) NETL
DOE Contract Number:
FC26-06NT42759
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; 03 NATURAL GAS

Citation Formats

Hobbs, Raymond. System and method for producing substitute natural gas from coal. United States: N. p., 2012. Web.
Hobbs, Raymond. System and method for producing substitute natural gas from coal. United States.
Hobbs, Raymond. 2012. "System and method for producing substitute natural gas from coal". United States. doi:. https://www.osti.gov/servlets/purl/1061450.
@article{osti_1061450,
title = {System and method for producing substitute natural gas from coal},
author = {Hobbs, Raymond},
abstractNote = {The present invention provides a system and method for producing substitute natural gas and electricity, while mitigating production of any greenhouse gasses. The system includes a hydrogasification reactor, to form a gas stream including natural gas and a char stream, and an oxygen burner to combust the char material to form carbon oxides. The system also includes an algae farm to convert the carbon oxides to hydrocarbon material and oxygen.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2012,
month = 8
}

Patent:

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  • A method is described of producing natural gas from a coal seam, comprising: (a) producing natural gas and liquid from a coal seam through at least one well; (b) ceasing the production of natural gas and liquid from the coal seam and injecting natural gas into the coal seam through at least one well at a pressure higher than coal seam pressure but lower than fracture pressures of immediately adjacent formations above or below the coal seam; and (c) subsequently producing natural gas and liquid from the coal seam through at least one well.
  • A carbonaceous material is converted to a fuel gas which is fungible with natural gas by a combination of steps comprising gasifying the carbonaceous material in the presence of air and carbon dioxide, purifying the effluent stream and separating carbon monoxide therefrom, catalytically reacting steam with the separated carbon monoxide and recovering a methane-rich product gas.
  • Using the cost levelization approach, the economics of producing substitute natural gas (SNG) are examined under different assumptions regarding conversion technologies, coal types and plant financing. A comparison of levelized constant dollar cost-of-service price estimated for Westinghouse and dry bottom Lurgi processes for 1990-2019 shows that SNG from coal produced at western sites is competitive with natural gas and fuel oils.
  • A method is given of producing gas from subterranean formations characterized by the steps of drilling and completing a plurality of at least two wells in a subterranean formation that contains at least some of the gas in the form of hydrate; melting the hydrates in the subterranean formation to free natural gas in situ; and producing to the surface natural gas freed by melting the hydrates. Melting of the hydrates includes the step of heating the subterranean formation and the hydrates by passage of a predetermined electrical current from one of the wells to the other. Also disclosed aremore » specific apparatus elements and method steps employed in performing this invention in a hydrate-containing subterranean formation. 5 Claims, 3 Drawing Figures (auth)« less
  • An improvement in the production of a natural gas substitute is disclosed comprising at least about 80% of methane by volume by multi-stage methanation of a synthesis gas containing hydrogen and oxides of carbon over fixed-bed nickel-containing catalysts under a pressure of about 5 to 100 bars. The starting synthesis gas, preferably produced by oxygen and water gasification of coal, has about 8 to 25% by volume of methane on a dry basis. It is methanated in a first stage at an inlet temperature of about 230/sup 0/-400/sup 0/ C and an outlet temperature of about 550/sup 0/ to 750/supmore » 0/ and then in a second stage at about 230/sup 0/ to 500/sup 0/ C. The process is economical with respect to heat consumption and equipment cost.« less