Method of operating a burner, including a combustion chamber with a low nitrous oxide emission
View Patent ↗There is described a method for operation of a burner, whereby a fuel is supplied to the burner, sprayed into the combustion air, mixed with the combustion air to give a fuel/air mixture and burnt in a combustion chamber. With regard to a combustion particularly low in pollutants and, in order to reduce the nitrogen oxide emissions with relation to achieving a given nitrogen oxide emission level, a change in parameters characterizing the fuel is determined. Such a parameter may, for example, be the Wobbe index. There is further described a device for carrying out said method, comprising a fuel treatment device, with an analytical device for the analysis of the current fuel composition and a monitoring and control system.
1. A method for operation of a burner with a combustion chamber, comprising:
injecting fuel into a combustion air;
mixing the fuel with the combustion air to form a fuel-air-mixture;
burning the fuel-air-mixture in the combustion chamber of the burner;
determining a parameter characterizing the fuel, the parameter being related to a nitrous oxide emission of the burner;
setting a reference value based upon the parameter characterizing the fuel for achieving a predetermined nitrous oxide emission;
determining a change of the parameter by comparing the determined parameter to the reference value;
when the parameter has changed, changing the composition of the fuel by mixing a medium to the fuel in order to change the parameter to the reference value; and
wherein the parameter characterizing the fuel is continuously detected in an analysis device and evaluated in a control system.
2. The method as claimed in claim 1 ,
wherein the parameter characterizing the fuel is based upon a Wobbe index WI, the Wobbe index WI being based upon a formula as follows:
W
I
=
L
H
V
S
G
·
T
/
T
Ref
wherein
LHV is the lower heat value of the fuel,
T is the absolute temperature of the fuel,
SG is the specific gravity of the fuel relative to air under standard conditions, and
T Ref is a reference temperature.
3. The method as claimed in claim 1 , wherein the medium is selected from the group consisting of: steam, water, nitrogen, hydrocarbon, and a combination thereof.
4. The method as claimed in claim 1 , wherein the burner is a burner of a gas turbine.
5. The method as claimed in claim 1 , wherein the fuel is selected from the group consisting of: oil, natural gas, synthetic gas, coal gas, and a combination thereof.