Medium pressure steam turbine

Prospects of development of gas turbine


Prospects of development of gas turbine. Significant! The advantages of gas turbine engines (GTE) in front of other types of main ship machinery contribute to their gradual introduction into shipbuilding. At present, the tallest ships in operation are the vessels for horse-drawn transport, equipped with a gas turbine engine with a capacity of 40,000 60,000 liters. with . At the end of 1968 r. commissioned ra30. turbohod “Paris Commune”, equipped with the installation of GTU – 20. In addition to these vessels, gas turbine installations are used (sludge and can be used) on icebreakers. fishing dry cargo vessels, hydrofoil vessels and on the air. Noah pillow with a displacement of 200 tons or more. The device of steam and turbines. The steam and gas turbines installed on the vessel are divided into co-operative, work-in-action outside of any auxiliary mechanism (pump, fan, propeller shaft, and auxiliary, leading electric turbine: high pressure (HPP), etc.) The main steam-turbine installations are carried out in the form of collapsible units consisting of two to three medium pressures). The latter are installed for maneuvering of the vessel and are located in racks (TSD), as well as in reverse turbines (TZH in separate hulls or in one case together with forward stupas (usually in TSD or TND).  shows a sectional section one of the turbines of the turbine unit – medium pressure turbines of active type The turbine consists of two main parts: fixed | oh – stator and rotating, mobile – rotor. The largest turbine assemblies are related to the stator: housing (usually detachable), support and thrust bearings, bearing chairs, diaphragms, labyrinth seals, fittings, as well as thermal insulation, plating, etc. The turbine casing is a hollow thin-walled metal ) a cylinder of complex configuration, designed to install in it a rotor attaching thereto other fixed assemblies and parts. Each

Medium pressure steam turbine

The turbine consists of two main parts.

The hull of the main ship turbine has a horizontal connector, which is necessary for opening the turbine housing for laying and lifting the rotor during assembly and repair. In addition to rop H 301 | The turbine housing often has vertical slots that mean. It simplifies the technology of casting body parts. Such a body with one horizontal two vertical connectors is shown in It consists of the upper 11, 5 and 11 of the lower 18; 23 bow parts, Ios 17 and aft 24 bearing chairs, molded together with the lower parts of the body and intended for fastening the turbine to the ship foundation. In the bow of the hull is two hundred. The active foam turbine of the backing, the steam for which is fed into the annular cavity 12, then enters the nozzles of the diaphragm 10, and from the nozzles to the working blades of the turbine disks there are steps of the active turbine of the forward running are located in the rear parts of the hull. Pairs of these stages are served crynel: ir, then through the nozzle diaphragm M 1.19 on the working blades 6 ring space 22, from there enters the nozzle 4 of the first disks 7 of the turbine rotor. The aggregate of the directors anna. The exact part of the turbine of the rotors 11 blades forms the passage of fresh steam on the mechanical stage. TZH, which reduces the overall k. II. D. installation. A steam that has worked in the steps of Til X (or TZH) lILI goes into the cavity 20 of the turbine | through the nozzle 21 11 steps into the Binna diaphragm capacitor represent a steel svshera or ugunnye disks that attach in to Outer undercuts of the turbine core. Diaphragms according to their purpose and location in the turbine are divided into intermediate 11 divided / common. Interval. Precise diaphragms serve to separate the cavities of the turbine housing into separate chambers (stages) with different vapor pressure. Each such diaphragm has in the center a hole for the passage of the rotor shaft, and on the “riferry” – nozzles located either around the entire circumference of the diaphragm) or on its part. Separating the data is intended to “divide the steps in front of” ero reverse, located in the same housing. Such diaphragms are made deaf and have no nozzles  separating the diaphragms of the pet) where the shaft emerges from the turbine housing, as well as in the places where the passage through the intermediate and separating diaphra is ero. from one stage to another. In the first case, the seal is called the outer 3, in the second case, the inner 8. In the head turbines of ships, various 11 e metal labyrinth seals are used (radial, axial, radial – axial, fir-tree, etc.) and tour bins of auxiliary mechanisms are jet turbines, external seals are the basis.Internal seals are installed only in that part of the case where the unloading noplieilb (dummis) is located in the case of reactive turbine of adjusting steps of the active type heaps. The thrust bearing 14 “thrust 16 is located a ra0tsya in the nose chair 17. and the thrust bearing 2 – in the aft chair 24 of the turbine housing. The thrust bearings are designed to accommodate the weight of the rotor and the radial forces arising from the operation of steam in the turbine, when the vessel rolls, etc. ., and also to ensure the centering of the rotor relative to the body onill1} {reducing friction when the rotor rotates. Thrust underminiulK Used to perceive unbalanced axial forces, 11 to hold it in a certain, or inKI. OnopE acting on the rotor, the position refers flax turbine casing 223

The movable part of the turbine – the rotor – consists of 113 shaft 9, the same. of discs mounted on iero 7 with working blades 6, parts fastened blades and disks between each other and with the shaft, thought. misa (only with jet turbines) details) and coupling 1 connecting the shafts of the rotor and the gearbox.

The design of the composite drum rotor of the jet turbine

Steam turbines as a drive to auxiliary mechanisms of mothers perform only single-body, mainly active ro type. In terms of design, they are simpler than the main turbines, but they have the same basic components. Gas turbines differ from steam in the design of the hull, the working and guide vanes. In fig. 161 shows a longitudinal section of the gas turbine of the ship “Peacock Vnogradov.” The turbine stator includes: housing 8, thrust bearings 12 and 6, thrust bearing 4, guide blades for forward running 2 and reverse running 11, rotor seals 3 and other small parts. The rotor consists of a shaft 5, rotor discs with. the working blades of the forward and reverse 10, thrust ridge, oil ° of the breaker rings and other parts of the Dnsn are pressed onto the rotor shaft and comprise six pressure stages HRP and two pressure levels Z. At the pressure level. HRP gas is fed through the pipe 7 and the ring is simple. A, from where it goes through the guide vanes on the working vanes. Exhaust gas is sent through you. travel space B to re generator, and then to the chimney

When the 3Xta3 stages work, the annular space B comes through the pipe 9, having completed work on the working blades 10 of the 3X turbine, goes into the output space B. than cooling by air. “is performed mainly in three ways: forced circulation of fluid; natural circulation zhid. bones ; sprayed water injection of the outer surfaces of the blades.

A longitudinal section of a gas turbine