ANNEX U.K. DISCRETE PROCESSES AND OPERATIONAL PARAMETERS ASSOCIATED WITH START-UP AND SHUT-DOWN PERIODS

1. Discrete processes associated with the minimum start-up load for stable generation U.K.

1.1. For solid fuel-fired boilers: complete transition from using the stability auxiliary burners or supplementary burners to operating with normal fuel only. U.K.

1.2. For liquid fuel-fired boilers: start of the main fuel feed pump and when burner oil pressure stabilises, and for which fuel flow rate may be used as an indicator. U.K.

1.3. For gas turbines: point where the combustion mode switches to fully premixed steady state combustion mode, or ‘idle speed’. U.K.

2. Operational parameters U.K.

2.1. Oxygen content of the flue gases. U.K.

2.2. Flue gas temperature. U.K.

2.3. Steam pressure. U.K.

2.4. For heat producing plants: enthalpy and heat transfer fluid rate. U.K.

2.5. For liquid and gas fired plants: fuel flow rate, specified as a percentage of the rated fuel flow capacity. U.K.

2.6. For steam boiler plants: temperature of steam at the exit of the boiler. U.K.