Crow Tribe of Indians: Synfuels Feasibility Study. Volume II. Process Design and Cost Estimate. Book III. Sections 6.5 Through 6.9

摘要

The principal difference in the design for the Coproduction Case is that methanol and substitute natural gas (SNG) are the major products as opposed to only SNG in the Base Case. The pure syngas is fed to a methanol synthesis unit producing methanol which is purified. The purge gas from the Methanol Synthesis unit is converted to SNG by methanation. Other process and utility/offsite units are similar to the Base Case except there is no requirement for a CO Shift unit and there is a slight variation in size of some units to accommodate the change in processing scheme. Coal feed to gasification and boilers is identical to the Base Case. Feed and product rates for this case are given in Section 6.5.2. Other than the methanol and SNG products, the byproduct rates are only marginally different from the Base Case. Power available for export is less than the Base Case, due mainly to the additional energy consumed in the Methanol Synthesis unit. (ERA citation 08:006718)