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Turbine Condensate System

Turbine Condensate System. www.powerpointpresentationon.blogspot.com. Presentation outline. Condensate Condensate System CEP Low Pressure Heaters Deaerator Function D/A Parts. What is condensate.

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Turbine Condensate System

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  1. Turbine Condensate System www.powerpointpresentationon.blogspot.com

  2. Presentation outline • Condensate • Condensate System • CEP • Low Pressure Heaters • Deaerator • Function • D/A Parts PMI Revision 00

  3. What is condensate • The steam after condensing in the condenser known as condensate, is extracted out of the condenser hot well by condensate pump and taken to the deaerator through ejectors, gland steam cooler and series of LP heaters. PMI Revision 00

  4. Condensate system • Condensate Extraction Pump : • To pump out the condensate to D/A through ejectors, GSC and LPH • Gland Steam Condenser : • To increase the temperature of condensate. • Condensate polishing unit : • To remove cat-ion and an-ion from the condensate. PMI Revision 00

  5. Condensate Systems D/A level controller : To control the level of D/A. Drain Cooler : To increase the temperature of condensate LPH : To increase the temperature of condensate Deaerator : To remove the dissolved gases from the feed water PMI Revision 00

  6. CEP • Converts last stage steam of LPT to water CEP CONDENSER GSC DEAREATOR LEVEL CONTROL CPU CONDENSER Minimum recirculation to condenser PMI Revision 00

  7. Condensate Pumps • The function of these pumps is to pumps out the condensate to the deaerator thru' ejectors, gland steam cooler, and L.P. heaters. These pumps have four stages and since the suction is at a negative pressure, special arrangements have been made for providing sealing. PMI Revision 00

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  9. Stages: The pressure build up in 4 stages as suction is at negative pressure. Recirculation: It is done when the de aerator level controller trips in order to prevent cavitations. PMI Revision 00

  10. CONSTRUCTIONAL FEATURES OF CONDENSATE EXTRACTION PUMP PMI Revision 00

  11. DESIGN FEATURES OF CEP • Vertical, Multi Stage, Multi-Shaft. • Can type construction with suction nozzle integral with Canister. • Double Suction first stage Impeller for minimum NPSHR. • Balancing holes and tilting pad Thrust Bearing for Axial Thrust. • Cutless rubber line bearings with axial flutes. • Shaft sealing by PTFE rope packing / Mechanical Seals. • Compatible materials for stationary and rotating parts. PMI Revision 00

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  13. FIRST STAGE PUMP ASSEMBLY: It consists of Pump Casing, a Double Suction Impeller and a Suction Bell Mouth. SECOND TO LAST STAGE PUMP ASSEMBLIES : It consists of Pump Casings and Single Suction Impellers. PMI Revision 00

  14. HEAD PIECE : It incorporates the discharge and suction branches and supports Thrust Bearing Housing & Driving Motor. It is sealed where the Shaft passes through Stuffing Box which incorporates soft packing and a Lantern Ring. Apertures are provided on Headpiece for accessing Coupling, Thrust Bearing and Stuffing Box. An air vent pipe is incorporated in the Headpiece for connection to the condenser tank. PMI Revision 00

  15. Condensate Flow LPH1 LPH2 LPH3 FROM CONDENSER TO DEAREATOR DRIPWATER DRIPWATER DRIPWATER CONDENSER CONDENSER CONDENSER CONDENSER PMI Revision 00

  16. L.P. Heaters • Turbine has been provided with non-controlled extractions which are utilised for heating the condensate, from turbine bleed steam. There are 3 or 4 low pressure heaters in which LP turbine last extractions are used. PMI Revision 00

  17. D/A LPT 5RD STAGE LPT 3RD STAGE LPH2 DC LPH1 LPH3 DRIP DRIP DRIP CONDENSER LOW PRESSURE HEATERS LPT 7RD STAGE BFP PMI Revision 00

  18. LPT STAGES 7TH STAGE 5TH STAGE 3RD STAGE PMI Revision 00

  19. Feed Water Heater • A Feedwater heater is a component used to pre-heat water delivered to the boiler. Preheating the feedwater reduces the amount of energy needed to make steam and thus reduces plant operation costs. This improves the thermodynamic efficiency of the system. PMI Revision 00

  20. Flow arrangement In parallel-flow heat exchangers, the two fluids enter the exchanger at the same end, and travel in parallel to one another to the other side. In counter-flow heat exchangers the fluids enter the exchanger from opposite ends. The counter current design is most efficient, in that it can transfer the most heat. PMI Revision 00

  21. Shell and tube heat exchanger Two fluids, of different starting temperatures, flow through the heat exchanger. One flows through the tubes (the tube side) and the other flows outside the tubes but inside the shell (the shell side). Heat is transferred from one fluid to the other through the tube walls, either from tube side to shell side or vice versa.. In order to transfer heat efficiently, a large heat transfer area should be used, so there are many tubes. In this way, waste heat can be put to use.. PMI Revision 00

  22. CONDENSER • Converts last stage steam of LPT to water PMI Revision 00

  23. What is deareator? • Deaerator is a device for air removal from water to make it non-corrosive. Deaerator generally implies not only the deaerator but also the feed water tank below where deaerated water is stored and fed to the suction of boiler feed pumps. PMI Revision 00

  24. Deaerator • The presence of certain gases, principally oxygen, carbon-di-oxide and ammonia, dissolved in water is generally considered harmful because of their corrosive attack on metals, particularly at elevated temperatures. • function is to remove dissolved gases from the feed water by mechanical means. PMI Revision 00

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  29. Principle of Deaeration: • Henrys law: The mass of gas with definite mass of liquid will dissolve at a given temperature and is directly proportional to the partial pressure of the gas in contact with the liquid. This holds within close limits for any gas, which does not unite chemically with the solvent. • Solubility Law: Solubility of gases decreases with increase m solution temperature and/or decrease in pressure. PMI Revision 00

  30. The deaerator comprises of two chambers: • Deaerating column. • Feed storage tank. PMI Revision 00

  31. Parts of D/A • Tubular type gauge glass. • High level alarm switch. • Low level alarm switch. • Pressure gauge. • Straight thermometers with pockets. • Safety valve • Isolating valves for steam pipes. PMI Revision 00

  32. DEARATOR WITH STORAGE TANK PMI Revision 00

  33. DEAERATOR PMI Revision 00

  34. Water Spray in Deaerator PMI Revision 00

  35. THANK YOU PMI Revision 00

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