In order to ensure stable control characteristics during the transition period of Gland steam supply valve closure to Leakage steam supply valve opening or vice-versa, the valve travel of both the valves have got slight overlap. The reference value for the steam pressure in the header can be set between mmWC by means of potentiometer on the controller.
The pressure reference value is compared with the actual value supplied by the transducer at the input to control of the deviation amplifier. The press controller is given the progressive static characteristics so that its action is increased in the event of large disturbance to the press control system eg.
The controller action is increased for larger deviations. Progressive characteristics of the press controller indicates that it is possible to adjust the amplifications between the press controller and position controller independently for each valve.
This feature enables to take care of any inaccuracies in the sizing of the supply and leakage valves and the pipe lines. Buka menu navigasi. Tutup saran Cari Cari. Pengaturan Pengguna. Lewati carousel. Karusel Sebelumnya. Karusel Berikutnya. Apa itu Scribd? Turbine Gland Steam Condenser. Diunggah oleh Sai Swaroop. Apakah menurut Anda dokumen ini bermanfaat?
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In impulse turbine the steam flows through the nozzle and strikes on the moving blades. But in the reaction turbine, the steam which glides over the moving blades possesses both pressure and kinetic energy. In impulse turbine the pressure of steam remains constant during its flow through the moving blades.
While based on the flow of steam they can be classified as a single flow, double flow and reverse flow turbines. Similarly, based on exhaust conditions, there are five main types of steam turbines; condensing, non-condensing, automatic extraction, mixed pressure, and regenerative extraction.
A turbine is a device that harnesses the kinetic energy of some fluid — such as water, steam, air, or combustion gases — and turns this into the rotational motion of the device itself. These devices are generally used in electrical generation, engines, and propulsion systems and are classified as a type of engine. Begin typing your search term above and press enter to search. Press ESC to cancel. Skip to content Home Dissertation How does the steam turbine gland sealing system work?
Ben Davis April 18, How does the steam turbine gland sealing system work? What is the purpose of sealing steam? How the gland seal steam helped the gland packing in preventing air from entering into the turbine casing? What is GVC in steam turbine? No words will be required. The HP and IP turbines are installed with lybnaith seals which are nothing but the grooves, on passage through the grooves the steam will lose it's pressure. LP turbine is connected to condenser itself so the leak off steam of lp turbine is disposed into condenser.
Hope it will help you Mani, B. The system cf contols the steam leakage by precisely defined and machined groves thar th leakage path between the stator is designe as a throttle groove where the sream progressively loses its energy and leakage is reduced to a trickle and the condensed water is collected, polished and used again as feed water. Longer the leakage path and smaller the gap of the mating grooves the lower will be the leak. As there is al ways a differential expansion and precise mounting and care full calculations of other influences such a the deflection and swelling of rotor and reduction of the gap should be calculated and at no point the grooves on the stator and rotor rub each other.
At the inlet to the turbine, the steam is superheated and at high pressure. I believe the seal is created through a series of overlapping glands with minimal clearance between them. The series of glands creates head loss.
With sufficient head loss, the flowrate can approach zero. At the outlet to the turbine, the pressure has typically been reduced to below atmospheric.
Minimal clearance between the glands creates head loss. With sufficient haed loss the flow rate approaches zero. Of course there will be some blowby, primarily in the form of liquid water. Simple or complex, the system requires timely care and maintenance.
An improperly balanced gland system can lead to water in the lubricating oil, loss of vacuum or accelerated wear on the packing gland components. No matter the configuration of your system, there is a delicate balance between the high pressure and low pressure ends of the turbine. The labyrinth-type seal rings in the gland housings are designed for a certain amount of pressure drop which coincides with the designed operating conditions of the unit.
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