METHOD FOR OPERATING A FIRING SYSTEM
A method for operating a firing system with a combustion chamber, in which a fuel is preheated and is supplied in the preheated state for combustion in the combustion chamber. The preheated temperature of the fuel is set higher for a part load of the firing system than with a basic load. In addition, the preheated temperature of the fuel is set using a variable obtained from the combustion in particular a load of the firing system. A firing system is also provided.
1 .- 3 . (canceled)
4 . A method for operating a firing system including a combustion chamber, comprising:
preheating a fuel; and
supplying the preheated fuel for combustion in the combustion chamber,
wherein a preheating temperature of the fuel is set higher for a part load of the firing system than the preheating temperature of the fuel for a basic load, and
wherein the preheating temperature of the fuel is a variable which is set as a first function of a flame stability in the combustion chamber.
5 . The method as claimed in claim 4 , wherein the preheating temperature of the fuel is set to a maximum possible value while adhering to a predetermined flame stability.
6 . The method as claimed in claim 4 , further comprising presetting the preheating temperature of the fuel in a first step as a second function of a stored assignment and more precisely setting the preheating temperature in a second step with an aid of a measurement result.
7 . A firing system, comprising:
a combustion chamber;
a compressor;
a control unit for setting the preheating temperature of a fuel as a function of a variable produced from combustion;
a fuel supply; and
a heating unit,
wherein a preheating temperature of the fuel is set higher for a part load of the firing system than the preheating temperature of the fuel for a basic load.
8 . The firing system as claimed in claim 7 , wherein the heating unit comprises at least two heat exchangers arranged in a fuel supply line and the two heat exchangers are connected to a plurality of heating stages of different operating temperatures.
9 . The firing system as claimed in claim 7 , wherein the heating unit comprises one heat exchanger.
10 . The firing system as claimed in claim 7 , wherein the plurality of heat exchangers are arranged serially in a fuel feed.
11 . The firing system as claimed in claim 7 , wherein the plurality of heat exchangers are arranged in parallel in the fuel feed.
12 . The firing system as claimed in claim 7 , wherein the firing system is a gas turbine system.
13 . The firing system as claimed in claim 12 , wherein the variable is a rotational speed of a rotor.
14 . The firing system as claimed in claim 7 , wherein the firing system is a combined gas and steam turbine system.
15 . The firing system as claimed in claim 7 , wherein the firing system is a steam power station.
16 . The firing system as claimed in claim 7 , wherein the control unit uses a plurality of sensors to determine a temperature of the fuel.