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Title: Underground Coal Gasification Test Project

Abstract

No abstract prepared.

Authors:
Publication Date:
Research Org.:
Washington Group International
Sponsoring Org.:
USDOE
OSTI Identifier:
914533
DOE Contract Number:
FC21-86LC11063
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; COAL GASIFICATION; US DOE; COAL

Citation Formats

D. Steve Dennis. Underground Coal Gasification Test Project. United States: N. p., 2005. Web. doi:10.2172/914533.
D. Steve Dennis. Underground Coal Gasification Test Project. United States. doi:10.2172/914533.
D. Steve Dennis. Sat . "Underground Coal Gasification Test Project". United States. doi:10.2172/914533. https://www.osti.gov/servlets/purl/914533.
@article{osti_914533,
title = {Underground Coal Gasification Test Project},
author = {D. Steve Dennis},
abstractNote = {No abstract prepared.},
doi = {10.2172/914533},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Dec 31 00:00:00 EST 2005},
month = {Sat Dec 31 00:00:00 EST 2005}
}

Technical Report:

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  • Underground coal gasification (UCG) experiments conducted during the 1970s at the Department of Energy (DOE) site near Hanna, Wyoming, formed six underground cavities in the Hanna No. 1 coal seam, an aquifer of low permeability. When the first Hanna UCG experiment began in March 1973, researchers had little information about what effects the geologic or hydrologic characteristics of the area might have on the UCG process; likewise, the effects of UCG on the environment were unknown. Since the UCG experiments were completed, dilute concentrations of pyrolysis products and leachates have been detected in groundwater monitoring wells in and near somemore » of the six cavities. Three primary UCG indicator constituents have been measured at elevated concentrations: phenols, TDS, and sulfate. The Hanna III cavity water exceeded the DOE target level for TDS and sulfate, and the Hanna I cavity water exceeded the DOE target level for phenols. The indicated phenols contamination, however, was in groundwater sampled from a well which was previously used as a production well during the experiment. Water pumped during the restoration project and a new well located approximately 10 ft from the old production well was sampled and no elevated phenols concentration was detected. Therefore, the restoration performed on the Hanna I cavity water was not necessary. The restoration was performed, however, because these indications were not available until during the restoration. Locally, various other constituents exceed DOE target levels, but concentrations are very near target levels and are well within livestock use limits. 2 refs., 7 figs., 5 tabs.« less
  • This project was conducted in the State of Washington to select and characterize a site (or sites) suitable for an underground coal gasification (UCG) experiment. A set of general criteria, based on previous UCG experience, was used to screen potential sites. Based on these criteria, the Tono Basin in the Centralia-Chehalis coal district, was selected for detailed characterization. The basin is near the Centralia Steam Electric Generating Plant, and it contains a 47-foot thick seam of subbituminous coal at a depth of about 600 feet. Geotechnical characterization of Tono was accomplished by using a combination of surface seismic surveys, surfacemore » electromagnetic surveys, borehole logging, coring, and hydrological testing. An environmental survey of the Tono Basin was also conducted. The results of the project have not disclosed any characteristics which would preclude conducting a gasification experiment in the Tono Basin. However, several factors need further evaluation before committing to a test: (1) the effect of the coal's high ash content; (2) the effect of possible fracturing near the top of the coal seam; (3) the seam's directional permeability; (4) the hydrogeologic characteristics of overburden sandstone; and (5) the local hydrology of the test site. A preliminary test plan was developed which, if implemented, should lead to a quantitative assessment of the correlation between pre-test characteristics and the functional UCG process, the product gas quality and potential use, and the environmental effects.« less
  • This project was conducted in the State of Washington to select and characterize a site (or sites) suitable for an underground coal gasification (UCG) experiment. A set of general criteria, based on previous UCG experience, was used to screen potential sites. Based on these criteria, the Tono Basin in the Centralia-Chehalis coal district, was selected for detailed characterization. The basin is near the Centralia Steam Electric Generating Plant, and it contains a 47-foot thick seam of subbituminous coal at a depth of about 600 feet. Geotechnical characterization of Tono was accomplished by using a combination of surface seismic surveys, surfacemore » electromagnetic surveys, borehole logging, coring, and hydrological testing. An environmental survey of the Tono Basin was also conducted. The results of the project have not disclosed any characteristics which would preclude conducting a gasification experiment in the Tono Basin. However, several factors need further evaluation before committment to a test: (1) the effect of the coal's high ash content, (2) the effect of possible fracturing near the top of the coal seam, (3) the seam's directional permeability, (4) the hydrogeologic characteristics of overburden sandstone, and (5) the local hydrology of the test site. A preliminary test plan was developed which, if implemented, should lead to a quantitative assessment of the correlation between pre-test characteristics and the functional UCG process, the product gas quality and potential use, and the environmental effects.« less
  • A program of investigation has been carried out to identify and characterize a site in Washington state suitable for underground coal gasification (UCG) experiments and possible commercial development. A site in the Tono Basin of the Centralia-Chehalis district containing an estimated 5 x 10/sup 10/ kg of subbituminous coal in two deeply buried seams (the Lower Thompson and the Big Dirty) was found that may be suitable for underground coal gasification (UCG) experiments and possible commercial development. Eight exploratory boreholes and two test wells were drilled to provide the primary subsurface geologic and hydrologic information about the site. A seriesmore » of surface gasification tests using large blocks of coal cut free of the Big Dirty seam in mine exposures will be conducted to establish a preliminary set of in situ operational parameters-air injection pressures, flow rates, and coal consumption rates. If the site is found suitable, the surface gasification tests will be followed by two deep underground gasification experiments - one employing borehole linking and the other reverse combustion-linking. The proposed large coal block surface gasification tests and the UCG experiments will provide a basis for decisions concerning the nature of future gasification efforts in the Tono Basin.« less
  • The test plan described here is the first part of a larger test series intended to culminate in a pre-commercialization pilot plant facility. The results from this test will be used to provide realistic cost data to evaluate the rest of the program. If the decision is made to go ahead with the program, then a detailed design will be made based on the results obtained and a long term (up to two years), multi-module test series will be started. Although a conceptual plan for the larger test series will be included as part of this plan, there are certainmore » basic parameters of the system that need to be measured by the first test before the detailed design is possible. At the present time the US experience is all related to thicker coal seams where the burn cavity width has been of the order of twice the seam thickness. If this holds true for the thinner Triunfo coal, then the test duration will be about 40 days and the coal consumption and gas quality should be as predicted by our model and as given later in this report. However, the Russian literature indicates that the relationship between cavity width and seam thickness is not the same for thin seams and that perhaps the width may be as much as 4 to 5 times the seam thickness but with poorer gas quality. The test described here in this report is designed to provide the needed data to establish the cavity width relationship for the Triunfo coal resource. Once the data and the construction cost data are available, the design of a larger pilot plant size facility can proceed with some confidence. 12 figs., 1 tab.« less