The inventions applicable to industrial gas turbines at power plant to minimize nitrogen oxides from gas turbine exhaust and maximizing gas turbine efficiency done by replacing the standard air filter system by oxygen filtration system (O) to allow oxygen only and substituting the nitrogen by high-pressure water HPW injected in compressor (C) last stages only. The one unit of oxygen to be injected by 4 units of HPW, since air contains 5 units 4 units of nitrogen and 1 unit of oxygen, the 5 units of oxygen are to be injected by 20 units of HPW required for the process. A heat exchanger to be installed at gas turbine exhaust duct to heat the HPW injected into compressor (C) last stages, which is to be mixed with HPW at ambient/atmospheric temperature to cool compressor air outlet temperature to targeted temperature as shown in FIG. 1. A control system is essential to control the process.

A power plant including a compressor, a combustion chamber and a turbine, and a compressor air line, which connects the compressor to the combustion chamber, a first heat exchanger connected into the compressor air line and into an exhaust line branching off the turbine. A first expander is arranged between the first heat exchanger and the combustion chamber in the compressor air line, and the first expander and the compressor are arranged on a common shaft.

The invention concerns an air inlet duct (10) for a compressor (12) of a gas or fuel oil turbine, including: two transition sections (S3, S4) in fluid communication with one another for the circulation of a flow of air through said sections (S3, S4), each of said sections (S3, S4) being self-supporting, a structure (20) for injecting a mist of liquid particles, configured to be disposed between said sections (S3, S4) and in contact with said sections (S3, S4), the structure (20) being removable independently of demounting said sections (S3, S4). The invention also concerns a gas or fuel oil turbine assembly comprising an inlet duct (10) of this type and a method of maintaining an inlet duct (10) of this type.

An inlet air conditioning system for a gas turbine includes an inlet duct for the with an air flow path to provide inlet air to the gas turbine; evaporative cooling media disposed in the air flow path; a water chiller; and a circulation pump that circulates water through the water chiller and the evaporative media in series. The chiller is configured to chill the water to below ambient wet-bulb temperature before the water is circulated to the evaporative cooling media. A power plant includes a gas turbine including a compressor, a combustion system, and a turbine section; a load; and the inlet air conditioning system.

A system for a gas turbine includes a control system comprising a processor. The processor is configured to receive a signal indicating spray intercooling fluid demand of the gas turbine. The processor is configured to determine a rate of change of the spray intercooling fluid demand. The processor is configured to control flow of a nitrogen oxide (NO.sub.X) minimization fluid that reduces NO.sub.X emissions from the gas turbine based at least in part on the rate of change of the spray intercooling fluid demand.

A control system for a gas turbine system includes a virtual filter. The virtual filter is configured to receive a power signal of the gas turbine system having a spray intercooler. The virtual filter is configured to substantially remove sensor noise in the power signal and filter transient power changes of the gas turbine system to provide a filtered power signal. The virtual filter is configured to provide the filtered power signal to a controller of the spray intercooler, wherein the controller is configured to control operation of the spray intercooler based on the filtered power signal.

An inflatable device equipped with a guiding mechanism and methods of installing the inflatable device to form a temporary barrier within a gas turbine engine are provided. In one aspect, an inflatable device includes a backbone and an inflatable bladder connected thereto. The backbone is formed of a flexible and inextensible material. The inflatable bladder is formed of an expandable material. To install the inflatable device within an annular chamber of a gas turbine engine, the backbone is inserted into a first access port of the engine and is moved circumferentially around the annulus of the chamber. The backbone is retrieved through a second access port. The inflatable bladder is moved into position within the chamber by pushing the backbone into the first access port and/or pulling the backbone out of the second access port. When positioned in place, the inflatable bladder is inflated to form an annular seal.

Methods and apparatus for controlling liquid flow to a turbine fogging array. Some implementations are generally directed toward adjusting the output of a variable output pump that supplies water to the turbine fogging array. In some of those implementations, the output is adjusted based on a determined target pump output value that is indicative of a pump output required to change the moisture content of intake air of a combustion turbine to meet a target humidity value. Some implementations are generally directed toward actuating at least one control valve of a plurality of control valves that control liquid throughput to one or more fogging nozzles of a fogging array.

A method and apparatus for the operation of a gas turbine unit with an evaporative intake air cooling system in the intake air pathway, wherein the return water flow of the evaporative intake air cooling system is used for the cooling of components of the gas turbine unit and/or of a generator coupled to the gas turbine unit and/or of another element coupled to the gas turbine unit, and a gas turbine unit adapted to be operated using this method.

An intake-air cooling device is disposed on a rear-stage side of a pre-filter disposed on an intake-air inlet side of an intake-air duct for guiding intake air taken in from an intake-air inlet to a compressor, for cooling the intake air by spraying water to the intake air. The intake-air cooling device includes a plurality of nozzles configured to spray the water to the intake air, a plurality of water conduit pipes including the plurality of nozzles arranged in an axial direction of the plurality of water conduit pipes, and a plurality of supply pumps configured to supply the water to a corresponding one of the plurality of water conduit pipes. Each of the plurality of water conduit pipes is an endless member which has a different perimeter.