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DEEP CONVERSION OF COAL
COAL GASIFICATION

Research by the Freiberg Mining Academy (TUBAF), FRG

The findings of R&D activities in choosing the most suitable process chains, with account of performance indicators, for coal conversion of D-grade coal mined at the Karakansky Zapadny open-cut mine to syngas demonstrate the following: the coal has unique properties favoring its use in a host of commercial gasification technologies, as well as in the innovation technology proposed by the Freiberg Mining Academy for obtaining syngas.

The coal from the Karakansky Zapadny open-cut mine is suitable for fixed-bed gasification technologies, fluidized-bed gasification and entrained-flow gasification. The viscosity of melted slag is in the optimal range, and so the coal needs no flux addition when used for entrained-flow gasification.

ABSTRACT FROM THE REPORT: «DEVELOPMENTAL STUDY. ASSESSMENT OF THE ENGINEERING AND ECONOMIC POTENTIAL OF DEEP CONVERSION OF BLACK COAL FROM THE KARAKANSKY ZAPADNY OPEN-CUT MINE»
COAL-WATER FUEL

The activities for preparation and combustion of coal-water fuel processed from D-Grade black coal mined at the Karakansky Zapadny open-cut mine have shown that the combustion process was stable and controllable, whilst the amount of harmful substances in the exit flue gas was below the allowable emission thresholds for conventional combustion. The given technology is undeniably rewarding for electric power generation and therefore it is applicable in small-scale thermal power engineering.

TECHNICAL REPORT ON EFFORTS INVOLVING THE PREPARATION AND COMBUSTION OF COAL-WATER FUEL BASED ON D-GRADE BLACK COAL
Test results of coal
Coal certificates and test results
Freiberg University of Mining and Technology, Germany
Tests for coal application possibilities – May 16-17, 2011.
Technical analysis
weight.%
Total moisture 15,0
Ash content (at 815°С) (dry fuel) 6,0
Volatile-matter content (dry fuel) 39,7
Solid carbon (dry fuel) 54,3
Combustion heat
weight.%
Upper combustion heat (primary fuel) 25,23
(dry fuel) 29,68
Lower combustion heat (primary fuel) 23,95
(dry fuel) 28,61
Ash fusibility

Reducing atmosphere
Sintering temperature °С 867
Deformation temperature 1227
Hemispherical temperature 1296
Yield temperature 1379
Resume

Tests of coal received from CJSC “Belovskaya Mine” proved its high usability as a gasification feedstock. This coal may undergo medium temperature gasification with receipt of simecoke and combustion gases, applicable for receipt of thermal and electrical energy.
Coal is also suitable for high-temperature gasification with derivation of syngas that may be used for production of a range of chemical products (ethylene or propylene for example) or for coal-to-liquid fuel conversion (synthetic liquid fuel or SLF).
Utilization methods applicable for tested coal include layered gasification technology, utilization in boiling beds installations, as well as gasification in the plume at high pressures. Application of most appropriate technology depends on a number of technical and commercial parameters.

Another notable characteristic of coal extracted at SJCS “Belovskaya Mine” has its high yield temperature of (1379°С), which provides opportunity to minimize customers’ expenses for maintenance of generating capacities through avoiding the use of expensive cleaning systems for combustion equipment and boilers.
Shenhua Shanghai Academy, PRC
Assessment of Russian coal direct liquefaction capability – 30.09.2011.

Russian coal provided for the tests has high profile qualities for liquefaction.
Hydgoren-carbon atomic ratio of tested coal is 0,79, vitrinite contents - 87,4%. Stated parameters explain high reaction and activity of the coal, as well as its high flexibility for liquefaction and inversion procedures.
Inversion at liquefaction of Russian coal exceeds 93%, gasoline yield exceeds 61%.

Resume

Preliminary assessment study of capability of the Russian coal for direct liquefaction has shown the following.
Assessed coal type is highly flexible for direct liquefaction. Direct liquefaction characteristic of the assessed coal was compared with same characteristic of Shenhuan Shendong coal. Comparison results evidenced that Russian coal has excellent liquefaction characteristics that excel same characteristics of some types of Chinese coal.

Thereon, liquid fuel plant with processing capacity of 3 mln t of coal shall produce 1,8 mln t of liquid fuel annually subject to use of coal supplied from CJSC “Belovskaya Mine”. Stated production number corresponds to actual annual requirements of Kuzbass for diesel fuel.

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