Power Plant Gyan

BOILER  WATER  CHEMISTRY ( BOILER WATER/ STEAMS ANALYSIS )   The main objective of feed and boiler water treatment in a power plant is to maintain the plant in a condition where it can operate reliably and efficiently. It aims:- a) To maintain the integrity of the feed, boiler and steam system by minimising corrosion to an acceptable level; b) To maintain the effectiveness of heat transfer surface by minimising the deposition of corrosion products & scale; c) To maintain a high level of steam purity and thus prevent problem in the super heaters,   re heaters, & turbine. The water has to be treated to obtain required quality before it is allowed to go into the boiler .The ultra-pure water so obtained is further conditioned in the feed system and then within boiler so that water is not aggressive to any of the variety of construction materials used in boiler, feed and steam cycles.           ...

CW SYSTEM Purpose The purpose of CWP system Presentation   is to provide the operating personnel with necessary information to safely operate and maintain the CWP   system & associated equipment. The scope of the Presentation covers an overview of the CWP System, System   Description, Normal Operation, Start-up / Shutdown, Emergency Operations & Alarms, Instrumentation & Process Control, Interlock & Protection The cooling water pump (CWP) sat   Power system is provided for each unit. & all pumps is   located CW House Building. Overview Purpose of the Circ Water (CW) system The purpose of Circulating Water Pump (CWP) is to remove the heat rejected to the Main Condenser by the low pressure turbines exhaust steam.  CWP transfers the heat from the Main Condenser to the atmosphere via natural  draft cooling towers. NEED OF COOLING TOWER : In Power plant, cooling tower cools down the hot water of Turb...

HP Bypass Station 1:- HP/LP bypass system can handel 60% of boiler load. 2:- HPBP valve is a combined pressure reducing and desuperheating station valve 3:- Spray water is tapped from BFP discharge  and spray controled by spray control valve. 4:- HPBP dumps the depressurised and desuperheated steam with suitable parameter into CRH line. 5:-Can operate without coordinate with turbine. 6:- Allows quick raising of steam parameters at a level acceptable to turbine for rolling operqtion during start up. 7:-Oil supply unit is installed for operation of HPBP & LPBP valves  8:-Supply oil pressure is maintained at 160 kg/cm2 by the pump and accumulator unit. Modes of HP Bypass Operation 1:- Boiler start-up with TG set at stand still. 2:- Rising of steam parameters to a level acceptable to turbine for rolling. 3:- Turbine start-up and loading while steam flow gets transferred to the turbine 4:- Parallel operation with turbine on load rejection. 5:- Allowing boiler...

TURBINE ROLLING OBJECTIVE OF TURBINE ROLLING:- To bring the unit on load and raised on rated output within optimum time but also without under stress on the turbine components. Warming up and startup of the turbine during various steam condition of or turbine metal temperature condition are given by the manufacturer in the form of few startup curves. TYPE OF UNIT STARTUP:- A unit start up described on the basic of  turbine metal temperature as given  (1) Cold startup :-  HPT metal temperature is less then 150°C. Shut down time greater than 5 days rolling steam pressure 40  kg/cm² rolling steam temperature 350  °C. Soaking time 1 to 1.5 hours Load gradient 3 mw/min. (2) Warm startup:-  HPT metal temperature is between 150°C to 350°C. Shut down time greater than 48 hours. rolling steam pressure 60  kg/cm² rolling steam temperature 400  °C. Soaking time half hours Load gradient 5 mw/min. ...

TABLE OF CONTENT 1:- Deaerator an introduction 2:- Deaerator connections 3:- Deaerator schemes DEAERATOR AN INTRODUCTION 1. Highest vessel in the system. 2. Remove dissolved gases. 3. Used for heating of feed water.  4. Reduce the amount of steam in the system and hence energy flow to the plant. 5. Extraction steam enters from the bottom of the tanks. 6. Steam passes over the water droplets. 7. As the extraction steam condensed the water droplets releases the non-condensable gases vented to the atmosphere. 8. The deaerated feed water & condensed steam mixed and drained out to the FST. 9. FST supply feed water to the boiler feed pumps. 10. Acted as a open type feed water heater. CONNECTION 1:-One pipe line coming from CEP discharge via through ejectors, GSC D/R coolers LPH-1, 2, 3 which supply the water to the Deaerator. 2:-Two pipe lines are connected to the Deaerator which are coming from HPH-5 & HPH -6 drips. 3:-Two v...

   1:- Introduction of generator seal oil system.    2:- Calculation & parameters for example.    3:- DCS snap view & some important images. INTRODUCTION / GENERAL DESCRIPTION 1:- A turbo generator for a generating unit  can not operate without this system. 2:- It prevents the leakage of gas (Hydrogen or Carbon dioxide) along the generator rotor shaft where it passes through the casing. 3:- To prevent hydrogen coming into contact with oxygen in the atmosphere (hydrogen oxygen mixture is highly explosive). 4:- Hydrogen leakage is prevented by providing gas tight housing at the generator end shields (mounted between end shields bearing either end of the stator). 5:- Some gas leak through the annular gap between shaft and stator housing, to prevent hydrogen leakage from this gap, high pressure oil film is provided continuously. 6:- So the shaft se...