초록 ▼

A slight tube assembly, in combination with a sensing instrument, such as an optical pyrometer, for use in continuously monitoring the temperature of the first row of rotating blades in large gas turbines, particularly the type used in industry. Temperature data received by the pyrometer unit is fed

A slight tube assembly, in combination with a sensing instrument, such as an optical pyrometer, for use in continuously monitoring the temperature of the first row of rotating blades in large gas turbines, particularly the type used in industry. Temperature data received by the pyrometer unit is fed to a control circuit, which regulates fuel input to the tubine to control the firing temperature. The key to obtaining reliable blade temperature data in the practice of this invention is the position of the sight tube in the turbine, which enables the pyrometer to “view”the rotating blades along a direct line of sight that penetrates a hot gas duct, but not the turbine section of the engine.

대표청구항 ▼

In combination, a sight tube assembly and an optical pyrometer, for controlling the firing temperature of a gas turbine, which comprises: an optical pyrometer unit that includes a first tubular member extending from the pyrometer unit, the first tubular member defining a coupler neck having an open

In combination, a sight tube assembly and an optical pyrometer, for controlling the firing temperature of a gas turbine, which comprises: an optical pyrometer unit that includes a first tubular member extending from the pyrometer unit, the first tubular member defining a coupler neck having an open end; a valve having open and closed positions, the valve having a first end and a second end, the first end being connected to the open end of the pyrometer coupler neck; a transparent member that serves as a sight glass, the sight glass being positioned between the pyrometer coupler neck and the first end of the valve member; a second tubular member that defines a nozzle, the nozzle having a first end fastened to a casing member of the turbine, the nozzle having a second end fastened to the second end of the valve; a sight tube that fits inside the nozzle, the sight tube having a first end and a second end, the first end of the sight tube being positioned between the second end of the valve and the second end of the nozzle, the second end of the sight tube extending into the wall of a hot gas duct member on the turbine, and the outside diameter of the sight tube being smaller than the inside diameter of the nozzle, such that an annulus is defined between the sight tube and the nozzle; and a turbine section in the gas turbine that includes several rows of stationary guide vanes and several rows of rotating turbine blades, the second end of the sight tube being positioned before the first row of stationary guide vanes, and the first row of stationary guide vanes being positioned before the first row of rotating turbine blades; the optical pyrometer sight tube assembly being positioned in the gas turbine such that a line of sight passes directly from the pyrometer unit through the sight glass and the sight tube, and between a pair of adjacent guide vanes in the first row of stationary guide vanes, to impinge on a selected area of the first row of rotating turbine blades; wherein, when the valve is in its closed position, the sight glass and pyrometer unit are isolated from the environment of the turbine section.