Method of reducing NO/sub x/ component of flue gas in heating coking ovens, and an arrangement of coking oven for carrying out the method

Patent · Tue Nov 03 00:00:00 EST 1987

OSTI ID:5604503

Janicka, J; Jakobi, W; Durselen, H; Meyer, G

This patent describes a method of reducing NO/sub x/ component of flue gas produced in the flame of a coking oven of the type having vertical heating flues cooperating in pairs of flamed and non-flamed flues, the flamed heating flues including inlets for rich gas, primary air and lean gas arranged at the bottom region of the flues to provide a low level combustion stage, and further including inlets for secondary air and secondary lean gas arranged above the low level combustion stage to provide a high level combustion stage, partitions separating the flamed and non-flamed heating flues in respective pairs having a top opening for recirculating flue gas from the flamed flue to the non-flamed one, and a bottom opening for mixing a branch current of the recirculating flue gas with the supplied primary air and rich and lean gases in the flamed flue. It consists of a. adjusting the recirculation current rate, namely the volume ratio of the recirculated flue gas branch current to the flue gas current without recirculation, to amount between 20% and 50%; b. adjusting the combustion stage ratio, namely the volume ratio of the supplied primary air in the low level combustion stage to the supplied secondary in the high level combustion stage to an amount between 40% and 70%; and c. arranging the high level combustion stage between 35% and 55% of the height of the heating flues.

• Assignee: Krupp Koppers GmbH, Essen
• Patent Number(s): US 4704195
• OSTI ID: 5604503
• Resource Relation: Patent File Date: Filed date 8 Nov 1985
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
54 ENVIRONMENTAL SCIENCES
FLUE GAS
COMBUSTION
DENITRIFICATION
NITROGEN OXIDES
REMOVAL
AIR FLOW
AIR POLLUTION CONTROL
COKE OVENS
FLAMES
GAS FLOW
CHALCOGENIDES
CHEMICAL REACTIONS
CONTROL
FLUID FLOW
GASEOUS WASTES
NITROGEN COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
THERMOCHEMICAL PROCESSES
WASTES
010800* - Coal
Lignite
& Peat- Waste Management
500200 - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)