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Multistage Back Pressure Turbines
Multistage Back Pressure Turbines
IB Turbo Pvt Ltd offers Multistage Back Pressure Turbines. MBT-6 Multi Stage Back Pressure Steam Turbines with Extraction: Upto 5 Stages for High Efficiency, Bleed Provision for different back pressure outlets, Programmable Control Panel for Synchronised and Stand alone operation, Woodward Governor for accurate control, Robust and Sturdy turbine for continuous operation.
- The turbine casing of this MULTI-STAGE turbine is split on horizontal centre-line to facilitate easy inspection and assembly during maintenance. Proper tightness of the mating surfaces is ensured through high-accuracy finish and using metal-to-metal contact without any sealing compound. The bottom half high pressure end of casing is secured and supported by a kinematic support to allow controlled expansion between casing and bearing pedestal. Radial pins fitted between casing flange and bearing pedestal, permit radial expansion of casing maintaining its concentricity with the pedestal which in turns ensures correct alignment during operation. A gap between the casing and the bearing pedestal allows for free circulation of air thus minimises the transfer of heat between from hot casing to the bearing pedestal.
- The rotor is a solid alloy steel forging and designed to be of stiff; i.e. the first critical speed is well above any operating speed or over-speeds. The soundness of the rotor is ensured using latest Ultrasonic testing techniques. The blades are made of alloy steel. Each blade is machined in one piece with its spacer root and is fixed in the grooves on periphery of the wheel. The outer ends of blades are connected by short lengths of shrouds riveted on. Each rotor is dynamically balanced to high degree of accuracy. This ensures the trouble free and smooth operation of rotor and a long life of bearings.
- The stop-and-emergency valve is spring loaded. The whole steam flow to the turbine passes first through the single beat combined stop and emergency valve, and then through the double seated control valve to the first stage nozzles of the turbine. The stop and emergency valve is mounted horizontally for ease of operation. The valve held fully open by the latch. Under the emergency conditions determined by the emergency trip gear and solenoid valve, the trip latch is operated and the Valve is closed by the action of valve spring. The valve when tripped is shut. Turning the hand wheel clockwise moves the guide nut, compressing the valve spring and keeping the valve on its seat. As the guide nut reaches the end of its travel, the trip catch is automatically engaged and is locked. Turning the hand wheel in ANTI-CLOCK direction, valve may then be opened.
- The Combined stop and Emergency Valve incorporates a balanced main valve and a pilot valve to enable it to be freely opened or closed against the full steam pressure, except when the valve is close, steam may pass through the holes in the main valve to equalize the pressure on either side of the valve. However, when the Combined Stop and Emergency valve is shut, the pilot valve having a small sliding movement relative to the main valve closes these holes.
- The control valve is mounted in the steam chest, which is rigidly bolted to the bottom half of the turbine cylinder. Depending on the load on the turbine, the control valve is opened by the linkage from the speed governor.
- The rotor is supported at both ends with special designed white-metal lined journal bearings called OFF SET HALF type. The bearing at the steam end side is housed in the pedestal attached with the turbine cylinder with a special attachment.
- A tilting pad type thrust bearing also contained in this bearing pedestal, which locates the rotor in its correct position and carries axial load developed during operation. The exhaust end bearing is fitted in a housing formed at the exhaust end of the turbine cylinder.
- Speed-reducing gear is generally mounted on the turbine base-plate. The high-speed gears are precision-machined, hardened and ground to achieve long operating-life. Lubricating oil from the lubricating oil system is used for cooling of the gears. The main oil-pump is mounted on the free end of the low-speed gear.
Multistage Back Pressure Turbines
IPF Multistage Back Pressure Turbines
Multistage
Back Pressure Turbines
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