Basic problems with burning of coals of the Kansko-Achinsk basin at thermal electric power plants

Journal Article · Thu Jan 01 00:00:00 EST 1981 · Sov. Power Eng. (Engl. Transl.); (United States)

OSTI ID:5945283

Marshak, Y L; Protsailo, M Y; Ivannikov, V M; Kucheryavii, O A

Kansko-Achinsk coals are characterized by a heat of combustion, low ash content, low sulfur concentration and high moisture content. Coals of the Berezovsk and Barandatsk formations have especially low ash content. The ash content of the Kansko-Achinsk coals is distinguished by a substantial concentration of calcium oxide (CaO = 20 to 60%), which is related to the organic part of the fuel in the form of humates; SiO/sub 2/ and Al/sub 2/O/sub 3/ are concentrated basically in the external ash. The concentration of CaO increases sharply in low-ash coals (to 50 to 60%) and SiO/sub 2/ and Al/sub 2/O/sub 3/ decrease. The coals have a high degree of slagging, especially with an increase in the concentration of CaO in the ash. Basic shortcomings of Kansko-Achinsk coals are caused by: slagging of the screens and semi-radiative heating surfaces (screen steam superheater); formation of thick sulfatized sintered ash deposits on convective heating surfaces; interruptions in dust systems with intermediate bunkers; clogging of ash conduits with hydraulic ash removal. The calculations indicate that, with the indicated amounts of CaO in the ash, the amounts of SiO/sub 2/ and Al/sub 2/O/sub 3/ are insufficient for complete bonding of the calcium oxide in the aluminosilicate. As a result, even the BKZ-320 boilers, which are better for the Nazarovsk and Irsha-Borodinsk coals, were unacceptable for Berezovsk coal as a result of slagging of the steam superheat, even with a decreased load on the boiler and with water cleaning of the screens. A broad program is being formulated for study and management of combustion of Berezovsk coal with development of an experimental section and creation of experimental primary boiler units, equipped with promising furnace equipment with solid and liquid slag removal.

• OSTI ID: 5945283
• Journal Information: Sov. Power Eng. (Engl. Transl.); (United States), Vol. 10:1
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
20 FOSSIL-FUELED POWER PLANTS
COAL
CALORIFIC VALUE
COMBUSTION PROPERTIES
USSR
FOSSIL-FUEL POWER PLANTS
ASHES
BUILDING MATERIALS
COAL DEPOSITS
COMBUSTION
MOISTURE
SLAGS
SULFUR
WASTE PRODUCT UTILIZATION
ASIA
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
EASTERN EUROPE
ELEMENTS
ENERGY SOURCES
EUROPE
FOSSIL FUELS
FUELS
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NONMETALS
OXIDATION
POWER PLANTS
RESIDUES
RESOURCES
THERMAL POWER PLANTS
THERMOCHEMICAL PROCESSES
014000* - Coal
Lignite
& Peat- Combustion
200108 - Fossil-Fueled Power Plants- Fuels- (1980-)