Method of optimizing the limitation of dust emissions for gas turbines fueled with heavy fuel oil

A method for optimizing a limitation of dust emissions of a combustion plant comprising:

• a gas turbine having a main compressor and at least one combustion chamber downstream from the main compressor;
• a liquid fuel oil supply line connecting a fuel source to the at least one combustion chamber, wherein the liquid fuel oil supply line comprises a heat exchanger for controlling a temperature of liquid fuel oil supplied from the fuel source, a tank for storing a soot inhibitor, and a mixer and a pump for and controlling an injection of the soot inhibitor;
• a line for generating fuel oil atomizing air, the line connecting the main compressor to the at least one combustion chamber, the line comprising an exchanger for controlling a temperature of the fuel oil atomizing air, a valve for controlling a flow rate of the fuel oil atomizing air, and wherein the main compressor controls an air pressure of the fuel oil atomizing air;
• a central controller receiving information on the temperature of the liquid fuel oil, a viscosity of the liquid fuel oil, the air pressure of the fuel oil atomizing air, and a combustion gas exhaust dust concentration, and controlling the temperature of the liquid fuel oil and the injection of the soot inhibitor;
• the method comprising:
• as a first step, defining a nominal operating point corresponding to the maximum permissible level of emitted dust, based on a nominal temperature of the liquid fuel oil, a nominal pressure ratio of the fuel oil atomizing air, and control of the injection of the soot inhibitor;
• as a second step, controlling a first parameter, selected from a group of the temperature of the liquid fuel oil and the pressure ratio of the fuel oil atomizing air, in order to reach another operating point;
• and
• as a third step, controlling the injection of the soot inhibitor to reach the maximum permissible level of emitted dust.