steam applications is the brush seal, long a staple of the gas turbine industry. The brush seal is constructed of many small diameter, tightly packed wire bristles, typically stainless steel, sandwiched in an outer ring. The bristles point inward toward the shaft at an angle off radial (see figure 6). They can be floating or fixed, maintain a ...
Type 28ST combines proven rotating groove technology and high-temperature secondary seals to reduce steam leakage by nearly two orders of magnitude, as compared to traditional sealing devices such as segmented carbon rings and labyrinths. Speed: up to 122 m/s/400 fps max.
GE Energy has retrofitted brush seals into more than 19 operating steam turbines. Brush seals offer superior leakage control compared to labyrinth seals, owing to their compliant nature and ability to maintain very tight clearances to the rotating shaft.
Sealing designs and analyses for steam turbines - ScienceDirect
2022年1月1日 · In steam turbines that need cooling designs to cool the blade roots and the rotor shaft of upstream stages in the IP turbine, cooling steam is provided through seal structures such as labyrinth seals in the upstream and the corresponding turbine stages.
Evaluate feasibility of advanced seal concepts and materials of meeting next generation engine speed and temperature requirements. Develop seal design and analysis methods. Provide a state-of-the-art turbomachinery seal test rig capable of testing seals under known and anticipated design conditions.
Introduction of new sealing technologies for steam turbines
2017年1月1日 · Recently qualified and applied advanced sealing technologies include: the variable bristle diameter (VBD) brush seal [2], [3] for high-pressure (HP) (up to 700 psid); the advanced brush seal with improved performance and quality [4], [5]; the active retractable seal that enables the seal to open during transient or trip conditions while keeping ...
Turbine steam seal type, classification, comparison
2023年3月13日 · The steam seal of the turbine is divided into different locations according to the installation: shaft end seal (referred to as shaft seal), bulkhead seal, and through-flow part of the steam seal, respectively, used to prevent the shaft end of the turbine, the bulkhead and the top of the moving leaves, the root of the steam leakage, its role is ...
GE steam-turbine seals have been tested successfully at pressure drops in excess of 2.76 MPa (400 psid)* differential. Installed in series, these seals can be used for pressure drops in excess of 4.14 MPa (600
Sealing designs and analyses for steam turbines - ScienceDirect
2022年1月1日 · The purpose of this chapter is to give technical explanations for steam turbine sealing designs that reduce leakages and minimize the negative impact of leakages on the performance and operations of steam turbines.
Abstract⎯Various types of shroud, diaphragm, and end seals preventing idle leak of working steam are installed in the flow paths of steam turbine cylinders for improving their efficiency. Widely known labyrinth seals are most extensively used in the Russian turbine construction industry. The category of labyrinth seals