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• W2078372805 abstract "Abstract A simplified model is described which will indicate the economic value of the raw product gas from an experimental underground coal gasification test on a real-time basis in order to aid in the optimization of the process during the course of the test. The model relates the properties of the product gas and the injection gas to the cost of producing each of five potential commercial products. This model is being utilized to evaluate data during the Gulf-DOE underground coal gasification test at Rawlins, Wyoming in the fall of 1981. Introduction Gulf Research and Development Company, along with TRW as a major subcontractor, is conducting a DOE- funded program to evaluate the technical and economic feasibility of underground coal gasification (UCG) in steeply-dipping beds under DOE Contract No. DE-ACO3- 77ET13108. The second experimental test in this program is scheduled to begin in August 1981 in the North program is scheduled to begin in August 1981 in the North Knobs area west of Rawlins, Wyoming. The goal of the UCG program is to develop an energy recovery process which is both technically and economically feasible for commercial applications. In the UCG process, the yields and quality (i.e., composition) of the raw product gas are dependent upon the quantities of oxygen (or air) and steam injected into the underground reactor zone. This study does not deal with the relationships between the injected and produced gases. The experimental data collected during the field test will provide that link. This study addresses the economic consequences of the experimental results. One of the objectives of Test 2 is to experiment with varying oxygen and steam injection rates in an attempt to optimize the gasification process. In order to aid in directing the course of the process optimization, a simplified model has been developed for measuring the potential commercial significance of the experimental variables. The model will be part of the on-site data acquisition system which will provide real-time data analysis to aid in the optimization of the process. Until now, the generally accepted criterion for UCG product quality has been its dry gas beating value. The value of the gas has been expressed as its production cost in $/MM Btu. However, the real value production cost in $/MM Btu. However, the real value of the properties of a raw product gas depend on the finished product to be produced from it and the contribution of each of its properties to that product. This model is an attempt to develop a better criterion for raw product gas quality, as a function of both its value as a feedstock for an upgraded commercial product and the cost of producing and upgrading it. product and the cost of producing and upgrading it. Given the raw product gas composition and the oxygen and steam injection requirements to achieve it, the simplified model estimates the costs of making the desired amount of each one of five possible upgraded products from underground coal. products from underground coal. This paper describes the UCG technology briefly and then describes the detailed process and economics model from which the simplified model is derived. This is followed by a discussion of the derivation procedure and the simplified model itself. procedure and the simplified model itself. THE UCG PROCESS Underground coal gasification is a means of producing energy from deep and/or thin coal seams which producing energy from deep and/or thin coal seams which are not amenable to room-and-pillar or strip mining. The process involves converting underground coal to a gaseous fuel by drilling into the coal seam, creating a highly permeable zone between injection and production wells, initiating underground combustion, production wells, initiating underground combustion, injecting steam and air or oxygen and withdrawing the product gas. product gas. The process reactions are similar to those which occur in a surface gasifier. The underground module consists of oxidation, reduction, pyrolysis, and drying zones, each with different sets of chemical reactions predominating. To a certain extent, the size and chemistry of these zones can be controlled by the oxygen and steam injection rates. The product gas is the result of the controlled incomplete combustion of the mat all consists primarily of hydrogen, carbon monoxide, carbon dioxide, methane, and water vapor, with smaller amounts of hydrogen sulfide, heavier hydrocarbons, tar, and particulates." @default.
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• W2078372805 date "1981-10-04" @default.
• W2078372805 modified "2023-09-23" @default.
• W2078372805 title "Underground Coal Gasification Product Quality Parameters" @default.
• W2078372805 doi "https://doi.org/10.2118/10188-ms" @default.
• W2078372805 hasPublicationYear "1981" @default.
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