초록 ▼

A control system for a cogeneration plant measures the flow of steam exceeding the requirements of the steam-using process. Water is injected into the combustion zone of a combustor of the gas turbine portion of the cogeneration system to provide a predetermined reduction in NOx products. The excess

A control system for a cogeneration plant measures the flow of steam exceeding the requirements of the steam-using process. Water is injected into the combustion zone of a combustor of the gas turbine portion of the cogeneration system to provide a predetermined reduction in NOx products. The excess steam is added to the output of the compressor portion of the gas turbine to augment the gas turbine power output due to the augmented mass flow. The control system reduces the water injection in proportion to the steam flow to maintain the total water flow to the combustion zone at a level which maintains the preferred level of NOx reduction. In a second embodiment, the excess steam is first injected into the combustion zone with a one-for-one equivalent reduction in water injection. When the excess steam exceeds the amount required for NOx reduction, the excess is added to the output of the air compressor for power augmentation. As the power augmentation steam is added a proportionate reduction is made in the NOx reduction steam to account for the fact that a fraction of the output of the air compressor passes through the combustion zone.

대표청구항 ▼

A method for controlling a cogeneration system of a type including a gas turbine and a heat recovery steam generator, said gas turbine including an air compressor, a combustor and a turbine effective, in combination, for producing a torque, and a quantity of hot gasses, said heat recovery steam gene

A method for controlling a cogeneration system of a type including a gas turbine and a heat recovery steam generator, said gas turbine including an air compressor, a combustor and a turbine effective, in combination, for producing a torque, and a quantity of hot gasses, said heat recovery steam generator being effective to absorb heat energy from said quantity of hot gasses for producing steam, the method comprising: injecting at least one of a steam and a water into a combustion zone of said combustor at a flow effective for producing a predetermined level of reduction in a NOx in said quantity of hot gasses; adding at least part of an excess steam from said heat recovery steam generator to compressed air from said air compressor whereby power output of said gas turbine is augmented; and reducing said at least one of a steam and a water in a proportion to said excess steam added to said compressed air effective to maintain said predetermined level of reduction in a NOx in said quantity of hot gasses.