Combustion process

Patent · Tue Jun 01 04:00:00 EDT 1993

OSTI ID:6425816

Dykema, O W

A combustion process for a nitrogen-bearing fuel is described comprising the steps of: (a) introducing said fuel into a first combustion zone; (b) combusting said fuel in said first combustion zone under a condition of fuel-rich stoichiometry at an oxygen to fuel stoichiometric ratio of from 0.45 to 0.80 and at a temperature in the range of from 1,500 K to 1,800 K whereby fuel-rich combustion products are produced and undesirable nitrogenous compounds are reduced to low levels; (c) passing said fuel-rich combustion products into a two stage final combustion zone; (d) combusting said fuel-rich combustion products in the first stage of said final combustion zone under a condition of fuel-rich stoichiometry at an oxygen to fuel stoichiometric ratio of from 0.80 to 1.0 and at a temperature in the range of from 1,500 K to 2,200 K to produce combustion products having nitrogenous oxide levels reduced substantially to near zero while substantially burning out combustibles virtually free from generation of any additional thermal nitrogenous oxides; and (e) thereafter, combusting said combustion products in the second stage of said final combustion zone at an oxygen to fuel stoichiometric ratio of greater than 1.0 and at a temperature of less than 1,500 K to facilitate substantially complete fuel burnout in the second stage of said final combustion zone.

• Assignee: Tansalta Resources Investment Corp., Calgary, Alberta (Canada)
• Patent Number(s): A; US 5215455
• Application Number: PPN: US 7-736950
• OSTI ID: 6425816
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800 -- Coal
Lignite
& Peat-- Waste Management
014000* -- Coal
Lignite
& Peat-- Combustion
AIR POLLUTION ABATEMENT
CHALCOGENIDES
CHEMICAL REACTIONS
COMBUSTION
COMBUSTION PRODUCTS
COMBUSTORS
FUEL-AIR RATIO
FUELS
NITROGEN COMPOUNDS
NITROGEN OXIDES
OPERATION
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION ABATEMENT
STAGED COMBUSTION
TEMPERATURE RANGE
TEMPERATURE RANGE 1000-4000 K
THERMOCHEMICAL PROCESSES