Summer training PresentationPresented By:Mohit Rathee 02915004909Ashutosh Varma 04115004909
Indraprastha PowerGeneration Co Ltd (IPGCL):Company Profile• With the unbundling of D.V.B. (Delhi Vidyut Board) on 01.07.2002,• Two companies came into existence under Genco (generation company) Indraprastha Power Generation Co. Ltd. (IPGCL) Pragati Power Corporation Ltd. (PPCL)• One transmission company (TRANSCO)• Three distribution companies (DISCOMS) 2 of 15To learn more please visit the companys website:http://www.ipgcl-ppcl.gov.in/
Why was the DVB dissolved?•In December 1998 when the then government came to power inDelhi regular Delhi Vidyut T & D losses board power cuts accumulating as high as for 10 to 15 liabilities of over 50% hours Rs.23000 crores• A fast and viable alternative was required• Delhi Electricity Board Regulatory Commission (DERC) was constitutedin May 1999 to look into the matter.• The Government of India on July 1, 2002, implemented the reforms 4 of 20
IPGCL / PPCL Stations at a glanceSTATION Rajghat I.P. Gas Pragati-I Pragati-III Power Turbine Power Combined Cycle Combined Cycle House Station Gas Power Gas Power Station Project, Bawana Capacity 135 270 330 1500 (N) (MW) 6 x 30 (GTs) 2 x 104 (GTs) 4 x 250 (GTs)Units (MW) 2x67.5 + + + 3 x 30 (STGs) 1 x 122 (STG) 2 x 250 (STGs) Synchronized on – 1985-86 (GTs) GT-1: 11th Oct., 2010Commissioning 1989-90 + 2002-03 GT-2: 09th Feb., 2011 1995-96 (STGs) STG-1: 03rd Oct., 2011 Treated water From Treated water From Water River Yamuna River Yamuna Sen Nursing Home & Rithala STP Delhi Gate STPs 5 of 1
TURBINESThe turbines used in the power generation can be of 2 types: Steam Gas Turbines Turbines 6 of 1
Steam turbines: SchematicA steam turbine is a mechanical device that extracts thermal energy frompressurized steam, and converts it into rotary motion.
Steam turbines: Operation- Rankine cycle• Water is heated in feed heaters(A to B) using steam extracted fromthe turbine.• Within the boiler itself, heat isused to further pre-warm thewater (in the economiser)before it enters the evaporativestages (C) where it boils.• At D superheat is added until theconditions at E are reached at theturbine inlet.• The steam expands in the turbineto the conditions at point F, afterwhich it is condensed and returnedto the feed heater.
Gas turbinesA gas turbine, also called a combustion turbine, is a rotary engine that extracts energyfrom a flow of combustion gas.• The Brayton cycle was used for the GT’s in the combined cycle plants• Energy is added to the gas stream in the combustor, where air is mixed with fueland ignited• Combustion increases the temperature, velocity and volume of the gas flow• This is directed through a nozzle over the turbines blades, spinning the turbineand powering the compressor Idealized Brayton Cycle
Pragati-III Combined Cycle GasPower Project, Bawana • The power plant at Bawana has a maximum capacity of 1500 MW. • It was set up to meet the power requirements of Delhi, especially with an eye on the CWG 2010. • Foundation Stone of 1500 MW, Pragati-III Power Project at Bawana laid by HONABLE PRIME MINISTER, SH.MANMOHAN SINGH ON 24-MARCH-2008.
Principle of Operation: • Plant turbines work on the principle of a Combined Cycle • Integrates two power conversion cycles - Brayton Cycle (Gas Turbines) - Rankine Cycle (Conventional steam power plant) • Aimed at increasing efficiency. • The principle - the exhaust of one heat engine (Gas Turbine) is used as the heat source for another (Steam turbine) - extracting more useful energy from the heat, increasing the systems overall efficiency. • The Combined Cycle Gas Turbine (CCGT) plant can achieve a thermal efficiency of around 60%, in contrast to a single cycle steam power plant which is limited to efficiencies of around 35-42%.
Observations:The image is a section of thesingle line diagram of the plantshowing:• One GTG (Gas TurbineGenerator) and its associatedequipment CONFIDENTIAL IMAGE• GCB (Generator Circuit Breaker)• Gas Turbine Generatortransformer• Excitation transformer• IPB (Isolated Phase Busduct)• Station auxiliary transformer• SPB (Segregated Phase Busduct)
GeneratorLayout description: Circuit-Breaker Systems HEC 7/8 • Rated maximum voltage (kV) : 25.2 • Rated frequency (Hz) : 50/60 • Rated peak withstand current kA peak: 575 • Opening time (ms): 30 ± 3
Bus Bar Systems: IPB(Isolated Phase Bus Duct) The Isolated Phase Bus is made of high grade aluminium for the Isolated Phase Bus enclosure and the Isolated Phase Bus conductor.
IPB(Isolated Phase Bus Duct)Conductors are usually wither extruded orrolled hollow aluminium tubes, supportedwithin the enclosure on porcelain orpolymer insulators.
Bus Bar Systems: SPB(Segregated Phase Bus Duct)
Excitation systems for Gas TurbineGenerators • Creating and strengthening the magnetic field of the generator by passing DC through the field winding is known as excitation. • The Equipment for supply, control and monitoring of this DC supply is called the Excitation system • The LC2100 Static Starter is an adjustable speed ac drive system specifically designed (by GE) to start a gas turbine-generator set.
Gas Turbine Generator Transformer • Rating: HV and LV = 220.6 MVA • No load voltage: HV= 420 kV LV= 16.5 kV • Line current: HV = 303.6 A LV = 7728.1 A • Vector Group: YNd11 • total weight : 266100kg
Steam Turbine Generator Layout• The image is a section of the singleline diagram layout of the plantshowing one STG (steam turbinegenerator).• There is a provision for two suchunits in the plant over two modules CONFIDENTIAL IMAGE(one in each module)• The Steam Turbine Generator hasthe following specifications: • 239.8 MW at 50 degrees • 16.5 kV • power factor = 0.85 • 3 Phase, 50 Hz, and • Static Excitation
HRSG(Heat Recovery steamGenerator)• A heat recovery steamgenerator or HRSG is an energyrecovery heat exchanger that CONFIDENTIAL IMAGErecovers heat from a hot gasstream.• It produces steam that can beused to drive a steam turbine(combined cycle).
RPHS (Rajghat Power House)• Two Units of 67.5 MW were installed in 1989-90 at Rajghat Power House as replacement for old Units and the present generation capacity of this Station is 135 MW• It is a thermal power plant• It uses coal which is supplied by the NCL, BINA. The coal is sourced from Raniganj, Bihar, and reaches the plant via locomotive.• The plant is situated over an area of 40 acres, and has an ash dump area of 24 acres.
GTPS• Six Gas Turbine Units of 30 MW each were commissioned in 1985- 86, operating on liquid fuel.• In 1990, the Gas turbines were converted to operate on natural gas.• Later due to growing power demand the station was converted into combined cycle gas turbine power station by commissioning 3 *34 MW Waste Heat Recovery units, in 1995-96.• The total capacity of this station is 282 MW• GTPS gets the gas, which is the most essential ingredient for producing electricity by the help of turbines, from GAIL HBJ Pipeline.• The 220/400 KV switchyard has been located in front of the power station.• The 220 KV switchyard control room is accommodated in the central control room itself.
2. STEAM TURBINE SPECIFICATIONS:• Capacity 34 MW• No of stages 50• Steam flow 125 ton/hr• Inlet temperature 502oC• Inlet pressure 40 kg /cm2• No of journal bearings 5• No of thrust bearing 1• Exhaust steam pressure 3.33atm• Exhaust steam flow 2.16 ton/hr• Exhaust pressure 0.105 kg/cm2• Lube oil pressure 9 kg/cm2• Over speed trip >3300 rpm• Differential expansion +6 to -4
3. GAS TURBINE SPECIFICATIONS:• Capacity 30 MW• Gas pressure 20 kg /cm2• Speed 5135 rpm• Generator speed 3000 rpm• Generation at 11 kV• Exhaust temperature 560oC• Air flow 490 ton/hour
4) Specifications of 66KV Current Transformer:• No. of Course 4• Rated Voltage 72.5KV/66KV• Rated Current 2000-1000• Rated Frequency 50Hz• Total Creep age distance 1700mm• Short time Current Rating 25 KV for 1 sec
6) A string of unused insulator • 6 discs = 11kV each. • Spindle type insulator
PPCL-1• To bridge the gap between demand and supply and to give reliable supply to the capital city, a 330 MW combined cycle Gas Turbine Power Project was set up on fast track basis.• This plant consists of two gas based Units of 104 MW each and one Waste heat Recovery Unit of 122 MW.• Gas supply has been tied up with GAIL through HBJ Pipeline.• Due to paucity of water this plant was designed to operate on treated sewage water which is being supplied from Sen nursing Home and Delhi Gate Sewage Treatment plants.