Gas-particle flows and coal combustion in a burner/combustor with high-velocity jets

Conference · Thu Dec 01 04:00:00 EST 1994 · Combustion and Flame; (United States)

OSTI ID:6558917

Zhou, L X; Lin, W Y; Luo, W W; Huang, X Q ^[1]

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1. Tsinghua Univ., Beijing (China). Dept. of Engineering Mechanics

Coflowing high-velocity jets have been used in a burner/combustor to stabilize a coal flame, instead of swirlers or baffles, for burning low-grade coals. The LDV measurements and three-dimensional numerical simulation of gas-particle flows in these combustors show a large and strong reverse-flow zone induced by the high-velocity jets, high particle concentrations in the reverse-flow zone, high velocity slip between two phases and also high mixing rates due to high turbulence, favorable to ignition and coal-flame stabilization. The three-dimensional numerical simulation of coal combustion indicates the important role of the central reverse-flow zone in volatile ignition and combustion. Numerical modeling has been used for seeking optimal geometrical sizes and flow parameters for practical combustors by creating a strong gas recirculation zone to stabilize the combustion of anthracite in tangentially fired furnaces without supporting oil and without slagging. In fact, the total amount of oil saved is about 10,000 tons/yr for a 410 T/h boiler.

• OSTI ID: 6558917
• Report Number(s): CONF-940711--
• Conference Information: Journal Name: Combustion and Flame; (United States) Journal Volume: 99:3-4
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
& Peat-- Combustion
AIR FLOW
ANTHRACITE
BLACK COAL
BOILERS
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COAL
COMBUSTION
DOPPLER EFFECT
ENERGY CONSUMPTION
ENERGY SOURCES
FLAMES
FLOW MODELS
FLOW RATE
FLUID FLOW
FOSSIL FUELS
FUEL CONSUMPTION
FUEL OILS
FUELS
GAS FLOW
LIQUID FUELS
MATERIALS
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
OXIDATION
PETROLEUM PRODUCTS
STABILIZATION
THERMOCHEMICAL PROCESSES
THREE-DIMENSIONAL CALCULATIONS
VELOCIMETERS