WATER CIRCUIT.pptx

coal power plant water circuit

1. SAN MIGUEL CONSOLIDATED POWER CORPORATION SAFETECH POWER SERVICES CORPORATION Water Circuit ( From Hotwell to Steam Drum)

2. SAN MIGUEL CONSOLIDATED POWER CORPORATION SAFETECH POWER SERVICES CORPORATION Objectives: To know the basic process flow of the Water Circuit System. To understand the basic concepts of the Water Circuit System . Identify the major equipment involved in the Water Circuit System, its functions and specifications .

3. SAN MIGUEL CONSOLIDATED POWER CORPORATION SAFETECH POWER SERVICES CORPORATION

4. SAN MIGUEL CONSOLIDATED POWER CORPORATION SAFETECH POWER SERVICES CORPORATION

5. SAN MIGUEL CONSOLIDATED POWER CORPORATION SAFETECH POWER SERVICES CORPORATION Boiler water is liquid water within a boiler, or in associated piping, pumps and other equipment, that is intended for evaporation into steam. Water Circuit Condensate is the liquid phase produced by the condensation of steam or any other gas.

6. SAN MIGUEL CONSOLIDATED POWER CORPORATION SAFETECH POWER SERVICES CORPORATION Water Circuit What is Condenser? It converts steam from vapor to liquid state by means of heat exchange using seawater as cooling medium. By condensing the exhaust steam, the turbine exhaust pressure is maintained at a vacuum. It means that the difference in pressure between the turbine inlet and exhaust is high, thus, a high turbine efficiency . Condenser Equipment Specification: Quantity: 1 set per unit Type: Shell and Tube type Shell side: Steam; 316 T/H Tube side: Sea Water: 31,500 T/H Dimension of tube: Dia.20 x. 05t x 12,3201L x 1960pcs Heating transfer Area: 9,898 m²

7. SAN MIGUEL CONSOLIDATED POWER CORPORATION SAFETECH POWER SERVICES CORPORATION Water Circuit Condensate extraction pumps (CEP) extract the condensate water from the condenser and pump it through the condensate polishing system and the LP heaters to the deaerator feed water tank .   Condensate extraction pumps (CEP) Equipment Specification: Quantity: 2 sets per unit Type: Vertical type Capacity: 400 m³/h Total dynamic head: 180m Minimum recirculation flow: 100 m³/h Number of Pump stage: 3 stage Motor: 325kW x 4P x 6.6kV x 60Hz

8. SAN MIGUEL CONSOLIDATED POWER CORPORATION SAFETECH POWER SERVICES CORPORATION Water Circuit Steam jet air ejector condenser  is used to collect condensate and condenses the  steam that used as motive steam for the ejector system. Steam jet air ejector condenser

9. SAN MIGUEL CONSOLIDATED POWER CORPORATION SAFETECH POWER SERVICES CORPORATION Water Circuit Gland steam condenser  is used to collect condensate and condenses the  steam that used for sealing steam  turbine which would preheat the condensate water. Gland steam condenser

10. SAN MIGUEL CONSOLIDATED POWER CORPORATION SAFETECH POWER SERVICES CORPORATION Water Circuit Low pressure heater 1 (LPH1) is a shell and tube heat exchanger, used to increase the condensate temperature which is passing through the tubes and the extraction no. 6 steam is being utilized and admitted to the shell. Equipment Specifications: Quantity: 1 set per unit Type: Shell/Tube type Shell side: Steam/Condensate 45.4T/H*0.354ksca*72.5/45.6 C Tube side: Water 362.2 T/H*11.7ksca*40/70.18C Tube formation: U shape; 2 pass; 394 tubes per pass Heating transfer area: Total 485m² Flow direction: counter flow Low pressure heater 1 (LPH1)

11. SAN MIGUEL CONSOLIDATED POWER CORPORATION SAFETECH POWER SERVICES CORPORATION Water Circuit Low pressure heater 2 (LPH2) is a shell and tube heat exchanger, used to further increase the condensate temperature which is passing through the tubes and the extraction no. 5 steam is being utilized and admitted to the shell. Equipment Specifications: Quantity: 1 set per unit Type: Shell/Tube type Shell side: Steam/Condensate 27.5T/H*0.785ksca*105.7/76.4 C Tube side: Water 363 T/H*10.5ksca*70.8/90.7C Tube formation: U shape; 2 pass; 394 tubes per pass Heating transfer area: Total 368m² Flow direction: counter flow Low pressure heater 2 ( LPH2)

12. SAN MIGUEL CONSOLIDATED POWER CORPORATION SAFETECH POWER SERVICES CORPORATION Water Circuit Low pressure heater 3 ( LPH3) Low pressure heater 3 (LPH3) is a shell and tube heat exchanger, used to further increase the condensate temperature which is passing through the tubes and the extraction no. 4 steam is being utilized and admitted to the shell. Equipment Specifications: Quantity: 1 set per unit Type: Shell/Tube type Shell side: Steam/Condensate 15.2T/H*1.818ksca*181/96.3 C Tube side: Water 363 T/H*9.89ksca*90.7/115C Tube formation: U shape; 2 pass; 394 tubes per pass Heating transfer area: Total 368m² Flow direction: counter flow

13. SAN MIGUEL CONSOLIDATED POWER CORPORATION SAFETECH POWER SERVICES CORPORATION Water Circuit Deaerator is a device that removes oxygen and other dissolved gases from liquids. Deaerators are commonly used to remove dissolved gases in feedwater for steam-generating boilers. The typical tray-type deaerator has a vertical domed deaeration section mounted above a horizontal boiler feedwater storage vessel. Boiler feedwater enters the vertical deaeration section above the perforated trays and flows downward through the perforations. Low-pressure deaeration steam enters below the perforated trays and flows upward through the perforations. The steam strips the dissolved gas from the boiler feedwater and exits via the vent valve at the top of the domed section. The deaerated water flows down into the horizontal storage vessel (deaerator storage tank) from where it is pumped to the steam-generating boiler system.

14. SAN MIGUEL CONSOLIDATED POWER CORPORATION SAFETECH POWER SERVICES CORPORATION Water Circuit Equipment Specifications: Quantity: 1 set per unit Inlet flow: 26.79T/H (steam) ; 362.59T/H (water) Operating temp: 310.3 C(steam); 158.4 C (water) Operating Pressure: 5.05 kscg Outlet flow: 458.73 T/h Design temp: 380 C Outlet oxygen content: 7 ppb Water tank volume: 120.9 m³ Deaerator & Deaerator storage tank

15. SAN MIGUEL CONSOLIDATED POWER CORPORATION SAFETECH POWER SERVICES CORPORATION Water Circuit Boiler feed pump (BFP) is a centrifugal pump used to pump feedwater into a steam boiler with a quantity of feed water corresponding to the quantity of steam emitted.   Equipment Specifications: Quantity: 2 sets per unit Type: Horizontal, Centrifugal, Multi-Stage (7 stage) type Capacity: 491 T/H x 1750m Bleed (3 rd ) stage pressure: 69.4 kscg Minimum recirculation flow: 137.3 t/H Balancing flow: 7.093 T/H Motor: 3,550kW x 2P x 6.6kV x 60Hz Boiler feed pump (BFP)

16. SAN MIGUEL CONSOLIDATED POWER CORPORATION SAFETECH POWER SERVICES CORPORATION Water Circuit Automatic recirculation control valve (ARCV) or Automatic minimum flow valve is applied in order to provide an automatic leak-off flow in case of low load conditions . The valve protects centrifugal pumps, especially BFP, by maintaining automatically, a minimum flow . Automatic recirculation control valve (ARCV)

17. SAN MIGUEL CONSOLIDATED POWER CORPORATION SAFETECH POWER SERVICES CORPORATION Water Circuit H igh-pressure heater 1&2 (HPH1&2) is a heat exchanger of the shell and tube type which further heats the feedwater before entry to the boiler. Further heat may be added to the feedwater without its becoming steam since its pressure has now been raised by the feed pump . T he feedwater passing through the tubes and the high pressure extraction no. 1 & 2 steam being admitted to the shell . High-pressure heater 1 (HPH1) High-pressure heater 2 (HPH2)

18. SAN MIGUEL CONSOLIDATED POWER CORPORATION SAFETECH POWER SERVICES CORPORATION Water Circuit Drum level control valve or Feedwater control valve (FWCV)   maintain a constant level  in a liquid supply such as a steam drum.  Level control valve  do this by regulating the flow into the liquid supply which maintains a constant level to meet the usage demands. Drum level control valve or Feedwater control valve ( FWCV)

19. SAN MIGUEL CONSOLIDATED POWER CORPORATION SAFETECH POWER SERVICES CORPORATION Water Circuit Economizers are mechanical devices intended to reduce energy consumption, or to perform useful function such as preheating the feedwater .   Economizer

20. SAN MIGUEL CONSOLIDATED POWER CORPORATION SAFETECH POWER SERVICES CORPORATION Water Circuit ECO-1 COMMON ECO-2S ECO-2R ECO-3 ECO-3 ECONOMIZER PROCESS FLOW: Feedwater is supplied to the economizer inlet header via stop and check valve. The feedwater flow is upward through the economizer, that is, counterflow to the hot flue gases. Most efficient heat transfer is hereby accomplished, while the possibility of steam generation within the economizer is minimized by the upward water flow. From the common economizer (ECO-1) tube assembly, heated water splits into two parallel paths and flows through each parallel economizers (ECO-2R and ECO-2S) in each reheater and superheater backpass respectively, and then recombines at junction header. The combine heated water flows through ECO-3 assemblies with counterflow to the hot flue gases, and to the economizer outlet header. The heated feedwater is then led to the steam drum via the economizer outlet link. Feedwater from HPH#2 CONVECTIVE BACKPASS

21. SAN MIGUEL CONSOLIDATED POWER CORPORATION SAFETECH POWER SERVICES CORPORATION Water Circuit Furnace  side walls , front and rear  walls and floor and evaporator panel are of membrane  wall construction. This results in a leak proof enclosure , eliminating gas leakage and corrosion of casing as seen in boilers with refractory . Furnace walls are consisted of tube or water wall tube which acts as heat exchanger with the feedwater to produce saturated steam that will be separated on the seteam drum. Furnace  

22. SAN MIGUEL CONSOLIDATED POWER CORPORATION SAFETECH POWER SERVICES CORPORATION Water Circuit The function of the steam drum internals is to separate the water from the steam generated in the waterwalls of the furnace and to reduced dissolve solids contents of the steam to below the prescribed limit. Separation of steam from water in the drum is generally performed in three stages; with the first two stages occurring in the turbo separators, and the final stage taking place at the top of the drum just before the steam enters the superheater . Steam drum

23. SAN MIGUEL CONSOLIDATED POWER CORPORATION SAFETECH POWER SERVICES CORPORATION Water Circuit – Steam Drum Internals Downcomer Waterwall Risers Steam/Water mixture Turbo Separator Water Screen Dryer Saturated Steam Outlet Feedwater from Economizer Wet Steam The primary separation stage is formed into two concentric cans. Spinner blades impart a centrifugal motion to the mixture of steam and water flowing upward through the inner can, thereby throwing the water to the outside and forcing the steam to the inside. The steam proceeds to secondary separation stage consist of two opposed banks of closely spaced thin, corrugated metal plates which directs the steam through a tortuous path and force entrained water against the corrugated plates. From the secondary separators the steam flows uniformly and with relatively low velocity upward to the series of screen dryers. These dryers perform the final stage of separation.

24. SAN MIGUEL CONSOLIDATED POWER CORPORATION SAFETECH POWER SERVICES CORPORATION Thank You and God Bless!!! 