Heat transfer enhancements for increasing fuel efficiency in high temperature furnaces
AssigneeGas Research Institute
InventorRichard Koppang
Life of this patent
Estimating the term…
Abstract
Techniques for increasing the thermal efficiency of high temperature combustion sources such as glass and other process furnaces are disclosed. These techniques include one or more of the steps of co-firing of a carbonaceous solid fuel or heavy fuel oil with the primary fuel in the primary combustion zone such that the co-fired fuel is cracked and thereby generates a high number density of carbonaceous particles sufficient to improve soot radiation; providing enhanced mixing of first burnout air with the flue gas in a first burnout zone; and promoting instability of boundary layer gases adjacent refractory packings.
Claims10
A process for increasing thermal efficiencies for high temperature industrial furnaces and the like comprising the steps of:
- (a) mixing a reburning fuel with combustion emissions in a gaseous reburning zone such that the reburning zone is substantially oxygen deficient;
- (b) passing the resulting mixture of reburning fuel and combustion emissions into a first burnout zone;
- (c) introducing burnout air into the first burnout zone such that the carbon monoxide concentration in the first burnout zone is reduced to a level below about 500 ppm;
- (d) enhancing the mixing of first burnout air with the flue gas downstream of the primary combustion zone in a first burnout zone;
- (e) advancing the resulting mixture from the first burnout zone to a second burnout zone having a temperature in the range from about 1300.degree. F. to about 1900.degree. F.;
- and
- (f) introducing a second stream of burnout air into the second burnout zone, said second stream of burnout air including a reducing agent capable of providing a source of nitrogenous reducing species thereby reducing the nitrogen oxides in the combustion emissions.
A process for increasing thermal efficiencies for high temperature industrial furnaces having a refractory packing comprising the steps of:
- (a) mixing a reburning fuel with combustion emissions in a gaseous reburning zone such that the reburning zone is substantially oxygen deficient;
- (b) passing the resulting mixture of reburning fuel and combustion emissions into a first burnout zone;
- (c) introducing burnout air into the first burnout zone such that the carbon monoxide concentration in the first burnout zone is reduced to a level below about 500 ppm;
- (d) advancing the resulting mixture from the first burnout zone to a second burnout zone having a temperature in the range from about 1300.degree. F. to about 1900.degree. F.;
- (e) introducing into the second burnout zone a reducing agent capable of providing a source of nitrogenous reducing species thereby reducing the nitrogen oxides in the combustion emissions;
- and
- (f) advancing the second stream of burnout air and the combustion emissions to a bed of refractory packing, the bed of refractory packing having a surface adapted to promote the tripping of the boundary layer gases proximal to it.
Dependencies are inferred from the claim text.