Method of burning pulverized coal

Patent · Tue Jul 03 00:00:00 EDT 1984

OSTI ID:6434879

Itse, D C; Penterson, G A

A method of burning pulverized coal and other fuels comprises the steps of containing a primary flowing stream of coal/air mixture received adjacent an inlet end of a tubular nozzle for discharge at an outlet end into a combustion zone of a furnace for burning. The stream is accelerated in a convergent venturi section upstream of the outlet to distribute and concentrate the coal particles toward a central portion of the venturi in a minimum area throat, followed by decelerating the flow downstream of the venturi throat in a convergent flow section while forming a shallow, annular, conically shaped flow pattern around a hollow spreader cone mounted in the convergent section. The annular flow is caused to swirl around the axis of the cone by vanes outwardly thereof within the convergent flow section of the venturi, thus forming a stable, annularly-shaped, swirling flow pattern for discharge into the combustion zone, wherein the coal is burned in an elongated flame pattern extending along the stabilized conical flow pattern. A zone of high temperature and reducing atmosphere is formed adjacent the hollow outer end of the cone due to recirculation of combustion products into the rich fuel/air mixture wherein the volatiles in the coal are driven off early in the combustion process and are rapidly burned in a continuing process reducing the formation of oxides of nitrogen.

• Assignee: Riley Stoker Corp.
• Patent Number(s): US 4457241
• OSTI ID: 6434879
• Resource Relation: Patent File Date: Filed date 23 Feb 1983; Other Information: PAT-APPL-469117
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
42 ENGINEERING
COAL FINES
COMBUSTION
FURNACES
AIR POLLUTION ABATEMENT
COMBUSTION CONTROL
COMBUSTION WAVES
COMMINUTION
FLUID FLOW
FUEL-AIR RATIO
CHEMICAL REACTIONS
CONTROL
OXIDATION
POLLUTION ABATEMENT
THERMOCHEMICAL PROCESSES
014000* - Coal
Lignite
& Peat- Combustion
421000 - Engineering- Combustion Systems