Hot gas recirculation type burning furnace

Patent · Tue Jan 15 04:00:00 EST 1980

OSTI ID:5805122

Haga, T; Hori, S; Ito, Y

This invention relates to a burning furnace of hot gas recirculation type for minimizing fuel cost. The furnace includes a cyclone which receives dust-containing exhaust gases. One or more secondary air-introducing nozzles are provided for the cyclone at top of or in close proximity to the upper end of the cyclone leading concentrically to a flue gas passage such as funnel. Upon introducing secondary air under pressure into the cyclone, a downwardly directing swirling air flow is formed therein for the separation of heavier dust together with part of the fed exhaust gases. The thus separated air-hot gas mixture including heavier dust particles is returned to initial stage of the furnace for the recirculation through the furnace. Lighter combustible soot or the like particles are burnt in a flame curtain formed in the cyclone and finally discharged together with main and substantially dust-free exhaust gas portion constituting an upwardly directing swirling core flow in the downwardly directing and swirling outer air flow, into the flue gas passage.

• Assignee: Kureha Kagaku Kogyo K K (Japan)
• Patent Number(s): US 4183306
• OSTI ID: 5805122
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320303 -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Equipment & Processes
42 ENGINEERING
421000* -- Engineering-- Combustion Systems
CHEMICAL REACTIONS
COMBUSTION
CONCENTRATORS
CYCLONE SEPARATORS
DESIGN
ENERGY CONSUMPTION
EQUIPMENT
EXHAUST GASES
EXHAUST RECIRCULATION SYSTEMS
EXHAUST SYSTEMS
FLUE GAS
FLUID FLOW
FLUIDS
FUEL CONSUMPTION
FURNACES
GASEOUS WASTES
GASES
INCINERATORS
INDUSTRIAL WASTES
INERTIAL SEPARATORS
MANAGEMENT
MUNICIPAL WASTES
NOZZLES
OXIDATION
POLLUTION CONTROL EQUIPMENT
SEPARATION EQUIPMENT
THERMOCHEMICAL PROCESSES
VORTEX FLOW
WASTE HEAT UTILIZATION
WASTE MANAGEMENT
WASTE PRODUCT UTILIZATION
WASTES