Petrographic characteristics of Romanian lignite and solid by-products resulting from circulating fluidized bed combustion -- CFBC

Book · Sat Dec 31 04:00:00 EST 1994

OSTI ID:43141

Panaitescu, C ^[1]; Dragos, L; Fluieraru, C; Nistor, I ^[2]

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1. Politehnica Univ. Bucharest (Romania)
2. Thermal Power Engineering Inst., Bucharest (Romania)

The low rank coals -- lignites -- are the main source, in Romania for power and thermal energy generation. The Circulating Fluidized Bed Combustion -- CFBC -- was chosen to be used for its particular features with very low emission levels. Carbopetrographic research, using optical microscopy, was carried out on the raw coals and, especially, on the carbonaceous products in different thermal stages and the residues. The existence of successive and simultaneous phases of degasing, pyrolysis and burning of organic and mineral material was revealed. The study gave the possibility of improving the process-governing parameters, in order to raise the combustion efficiency on once-through combustors. The main solid fuel fired in power plants is the lignite obtained from surface exploitation. Experience of its use in high load power systems has shown that it can be fired only by adding liquid fuel. Moreover, it is rather difficult to prepare it to exact size requested. The only technology conveniently applied for this fuel was the fluidized bed combustion (FBC), which uses a 0--7 mm-sized lignite. On the basis of this original concept technology, steam and hot water load generators were built in Romania, that is 2 t/h, 8 bar, 170 C, and 10 t/h, 16 bar, 350 C steam generators and 5 Gcal/h, and 10 Gcal/h hot water boilers. For loads over 100 Gcal/h, 100 t/h, circulating fluidized bed combustion boilers were conceived.

• OSTI ID: 43141
• Report Number(s): CONF-940930--
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
CHARS
CHEMICAL PROPERTIES
COMBUSTION KINETICS
COMPILED DATA
FLUIDIZED-BED COMBUSTION
FOSSIL-FUEL POWER PLANTS
LIGNITE
PETROGRAPHY
PHASE STUDIES
ROMANIA