Sales reducing costs through increased

The world s only large scale SNG from coal plant is economical only because most of the original capital related costs have been abandoned. Current natural gas prices are so low that it is difficult to keep operating costs below SNG sales revenues. Nevertheless, the plant is able to continue operation through the dedicated efforts of both the individuals and organizations involved to increase production, increase revenues from chemical by-products, and further reduce operating cost. 

To increase the heating value of the gas, and to reduce its volume, the gas can be recirculated from the retort through a heater and back to the retort. In this case, no actual combustion occurs in the retort, and the carbon residue is left behind. Part of the gas make is used to fire the heater the remainder is available for steam generation, or for sale. Obviously, the addition of the heaters Increases the capital cost, but the increased cost may be offset by the increased value of the high BTU gas. All of the gas... 

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