Characterization of coals for circulating fluidized bed combustion by pilot scale tests

Book · Sun Dec 31 04:00:00 EST 1995

OSTI ID:288008

Lopez, L A; Cabanillas, A C; Becerra, J.O. de ^[1]

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1. CIEMAT, Madrid (Spain)

The major part of the Spanish coal supply is low range coal with both high ash (20--40%) and sulfur (1--8%) content. The use of this coal, by conventional combustion processes in power and industrial plants, implies a very high environmental impact. The Circulating Fluidized Bed Combustion process enables an efficient use of this coal. The Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas is carrying out a program with the intention of assisting companies in evaluating fuel quality impact, using atmospheric fluidized bed combustion. This paper reviews the major results of the fuel program in order to determine the fluidized bed combustion performance of four fuels. Two lignites, a bituminous coal and an anthracite. The two lignites have very high sulfur content (7% and 8%) but the sulfur is organic in one case and pyritic in the other. The bituminous coal and the anthracite have 1% and 2% sulfur content respectively and the sulfur is pyritic in these cases. In order to reduce the sulfur in the flue gases, a high calcium content limestone has been used as sorbent. The combustion trials have been done in a circulating fluidized bed pilot plant with a 200 mm inside diameter and a height of 6.5 m. The influence of temperature, fluidization velocity, oxygen excess, Ca/S ratio and coal properties have been studied in relation to the combustion efficiency, sulfur retention, CO and NO{sub x} emissions.

• OSTI ID: 288008
• Report Number(s): CONF-950522--; ISBN 0-7918-1305-3
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
ANTHRACITE
ASH CONTENT
BITUMINOUS COAL
CARBON MONOXIDE
CHEMICAL PROPERTIES
CIRCULATING SYSTEMS
COMBUSTION PROPERTIES
EXPERIMENTAL DATA
FLUIDIZED-BED COMBUSTION
FLUIDIZED-BED COMBUSTORS
FUEL SUPPLIES
LIGNITE
MATERIALS TESTING
NITROGEN OXIDES
PERFORMANCE TESTING
SORBENT INJECTION PROCESSES
SPAIN
SULFUR CONTENT
TEST FACILITIES
THERMAL EFFICIENCY