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Lime has also been shown to improve the yield and quality of the MCG liquids. In this situation where the original coal has a high sulfur content, the MCG process can be practiced with a coal-lime mixture and the calcium values retained on the char can tie up the unconverted coal sulfur upon pf combustion of the char. The co-product char material can be used in place of coal as a pulverized fuel (pf) for power generation in a coal combustor. These liquids are also extremely enriched in l-, 2-, and 3-ring aromatics. The resultant liquids more » have a much higher H/C ratio than conventional pyrolytic tars and therefore can be hydroprocessed at lower cost. By properly tailoring the pyrolysis severity to control the liquid yield-liquid quality relationship, it has been found that a higher quality distillate-boiling liquid can be readily ``skimmed`` from the coal. Most past pyrolysis developments were aimed at maximizing the liquids yield which results in a low quality tarry product requiring significant and capital intensive upgrading. MCG is based on low temperature pyrolysis, a technique known to the coal community for over a century. METC has concluded that MCG technology has the potential to simultaneously satisfy the transportation and power generation fuel needs in the most cost-effective manner. « lessĪuthors: Greene, Marvin Publication Date: Research Org.: Lummus Crest, Inc., Bloomfield, NJ (United States) Sponsoring Org.: USDOE USDOE, Washington, DC (United States) OSTI Identifier: 6987511 Report Number(s): DOE/MC/25020-3126 ON: DE93000206 DOE Contract Number: AC21-88MC25020 Resource Type: Technical Report Country of Publication: United States Language: English Subject: 01 COAL, LIGNITE, AND PEAT COAL PYROLYSIS COAL GASIFICATION COAL LIQUIDS HYDROCRACKING HYDROGENATION SHALE OIL CALCIUM OXIDES CHARS DISTILLATES PROGRESS REPORT YIELDS ALKALINE EARTH METAL COMPOUNDS CALCIUM COMPOUNDS CARBONACEOUS MATERIALS CHALCOGENIDES CHEMICAL REACTIONS CRACKING DECOMPOSITION DOCUMENT TYPES ENERGY SOURCES FLUIDS FOSSIL FUELS FUELS GASIFICATION LIQUIDS MATERIALS MINERAL OILS OILS ORGANIC COMPOUNDS OTHER ORGANIC COMPOUNDS OXIDES OXYGEN COMPOUNDS PYROLYSIS PRODUCTS THERMOCHEMICAL PROCESSES 010409* - Coal, Lignite, & Peat- Pyrolysis & Carbonization- (1987-) 010404 - Coal, Lignite, & Peat- = , Lime has also been more » shown to improve the yield and quality of the MCG liquids. The resultant liquids have a much higher H/C ratio than conventional pyrolytic tars and therefore can be hydroprocessed at lower cost. By properly tailoring the pyrolysis severity to control the liquid yield-liquid quality relationship, it has been found that a higher quality distillate-boiling liquid can be readily skimmed'' from the coal.
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