Systems relating to turbine engine control and operation

A fuel delivery system for a combustion turbine engine comprising:

• a fuel line connected to a source of fuel and connected to a combustor of the combustion turbine engine, the fuel line having a heat exchange portion disposed in heat transfer relationship with a heat source for heating the fuel prior to the fuel being delivered to the combustor;
• a rapid heating value meter disposed to measure the heating value of the fuel;
• a cold leg bypass comprising an alternate fuel line that bypasses the heat exchange portion of the fuel line, the cold leg bypass being connected to the fuel line at an upstream fork, which is disposed upstream of the heat exchange portion, and at a fuel mixing junction, which is disposed downstream of the heat exchange portion;
• a downstream bypass that comprises a second alternative fuel line that bypasses the heat exchange portion;
• and
• means for controlling the amount of fuel being directed through the heat exchange portion and the amount of fuel being directed through the cold leg bypass;
• wherein the fuel mixing junction is positioned such that the length of fuel line between the fuel mixing junction and the combustor gas control valve is between approximately 2 and 20 meters;
• and
• wherein the downstream bypass is connected to the fuel line at a first location, the first location being downstream of the upstream fork and upstream of the heat exchange portion, and a second location, the second location being upstream of the fuel mixing junction and downstream of the heat exchange portion.