This document discusses supercritical power plants in India, including:
1. NTPC operates several supercritical power plants in India with a total installed capacity of 3,300 MW. Their Sipat plant includes 3 x 660 MW supercritical units.
2. Supercritical technology provides benefits like reduced emissions, improved efficiency, and lower fuel costs compared to subcritical plants.
3. Operating supercritical plants presents issues and challenges related to boiler control, chemistry regimes, and performance optimization. NTPC's experience provides lessons for addressing these challenges.
Thermal Power Plant Simulator, Cold, warm and Hot rolling of Steam TurbineManohar Tatwawadi
The presentation describes the cold rolling, warm rolling and hot rolling and synchronising of steam turbine. The Temperature Matching Chart for Turbine metal and Steam is also discussed in the presentation
The document discusses the HP/LP bypass system used in thermal power stations. The bypass system allows live steam from the boiler to bypass the turbine and be dumped into the condenser. This allows the boiler to continue operating during turbine trips or startup before the turbine is up to temperature. It comprises HP and LP bypass valves, spray valves, and other components. The bypass system cuts startup time, allows boiler operation during trips, and helps match boiler and turbine temperatures for efficient operation.
Super critical power plants operate above the critical point where there is no distinction between liquid and gas phases. They have higher efficiencies of around 45-47% compared to 38% for subcritical plants due to higher turbine inlet temperatures and pressures above 240 atm. Once-through boilers without drums are better suited for supercritical conditions as they allow forced circulation through all sections compared to drum-type boilers. Super critical plants improve efficiency but have higher capital costs.
The document provides information about the layout and components of the Raj West Power Plant in Barmer, Rajasthan, India. The plant will be a 1080MW lignite-based thermal power plant using circulating fluidized bed combustion technology. Coal will be sourced from nearby mines through a joint venture company. The general layout and components of a thermal power plant are described, including coal handling, the boiler, turbine, generator, condenser, and ash handling. Key specifications of equipment like circuit breakers and isolators in the switchyard are also mentioned.
Oxygen treatment for super critical power plantsSantosh Pardhi
Oxygen treatment improves water quality in supercritical power plants by reducing flow-assisted corrosion and impurities that cause turbine blade deposits. It works by dosing oxygen gas at the deaerator and condensate polishing unit outlet to produce stable iron oxide layers that minimize corrosion. The advantages of oxygen treatment include virtually no iron transport, reduced flow-assisted corrosion, less frequent regeneration of condensate polishers, and a broad effective pH range.
This document discusses heat rate audits in thermal power plants. It aims to identify causes of efficiency losses that increase heat rate. Some key points:
- Heat rate is the amount of heat input (fuel) required per unit of power generated and impacts generation costs. Lower heat rates reduce costs.
- Losses occur in the boiler, turbine, condenser/feedwater systems, circulating water system, and from electrical/steam auxiliaries.
- Common causes of higher heat rates include incomplete combustion, turbine erosion, condenser tube fouling, and electrical auxiliary inefficiencies.
- Tracking plant parameters and conducting monthly performance tests can identify losses and guide improvement efforts to lower heat rates.
This document describes the key components and processes involved in a thermal power plant. Water is heated to produce steam, which spins turbines connected to generators to produce electricity. The main components are the boiler, turbines, condenser, cooling tower and auxiliary systems. Coal is pulverized and burned in the boiler to heat water and produce high pressure steam. The steam powers high, intermediate and low pressure turbines in succession to generate electricity before being condensed back into water in the condenser. The water is cooled in the cooling tower and recycled to the boiler to repeat the process.
The Thermal Power Station burns fuel & uses the resultant to make the steam, which derives the turbo generator. The Fuel i.e. coal is burnt in pulverized from. The pressure energy of the steam produce is converted into mechanical energy with the help of turbine. The mechanical energy is fed to the generator where the magnet rotate inside a set of stator winding & thus electricity is produced in India 65% of total power is generated by thermal power stations. To understand the working of the Thermal Power Station plant, we can divide the whole process into following parts.
KTPS-V Station in Andhra Pradesh was commissioned in 1996 as the first major thermal power station in the state. It uses a steam turbine generator system where coal is burned to produce steam that spins the turbine to generate electricity. The station has four main circuits: steam and water, air and gas, coal and ash, and cooling water. Steam is produced in a boiler and drives high, intermediate, and low pressure turbines connected to an electrical generator before condensing in a condenser.
This document provides details on boiler types, components, and pressure parts. It discusses various classifications of boilers based on application, construction, fuel firing, number of drums, circulation, and other factors. Key boiler components and pressure parts are described in depth, including drums and drum internals. Performance parameters, design requirements, stress analysis needs, and arrangement considerations are covered for pressure parts. Specific features of 500MW utility boilers and recent changes are also summarized.
The writeup details the Heat Balance of BHEL 210 MW Turbine Cycle. The Input and Output steam condition of Turbines, Extractions, Deaerator, LP Heaters, Condensers etc have been computed as per the specifications of the turbine manufacturer
The document discusses steam turbine control and instrumentation. It describes various types of steam turbines including conventional cycle, combined cycle, and nuclear turbines ranging from 210MW to 800MW. It then discusses the aims of automation in steam turbines, including improved control quality, increased plant availability and efficiency. The document outlines the main subsystems of steam turbine control including control systems, monitoring and measurement systems, and protection systems. It provides details on an Automatic Turbine Run-Up System (ATRS) which automatically controls the start-up process. The ATRS utilizes functional group control philosophy and consists of sub-group controls, sub-loop controls, and drive interface controls. It also describes the turbine protection system and various tripping criteria to
The document discusses steam turbine losses and how to identify them. It outlines several types of losses including mechanical damages, flow area decreases or increases, and flow area bypasses. Specific examples of each type of loss are provided along with their symptoms and causes. These losses can lead to reduced turbine efficiency. The document also discusses the impact of deviations from design parameters on heat rate and gives an example analysis of efficiency losses for a KWU turbine.
Best ppt on thermal power station workingRonak Thakare
The document provides an overview of thermal power generation and the key components involved. It discusses how chemical energy from fuel is converted through various processes into electrical energy. The main components that enable this conversion are the boiler, turbine, and generator. Steam generated in the boiler powers the turbine, which spins the generator's rotor to produce electricity via electromagnetic induction. The turbine has high, intermediate, and low pressure sections to efficiently extract energy from the steam.
The document provides an overview of the key components and processes involved in a thermal power plant. It discusses the basic principle of converting heat energy from fuel combustion into electrical energy through a steam turbine generator. The main components and processes described include the boiler, steam generation using a Rankine cycle, superheaters, reheater, economizer, turbine, condenser, and feedwater system. Auxiliary components to support combustion and power generation such as mills, fans, precipitators and the ash handling system are also outlined.
This document discusses the control and instrumentation system for the Jaypee Bina Thermal Power Plant's 2x250 MW furnace safeguard and supervisory system (FSSS). The FSSS is designed to safely start up and shut down the boiler and prevent operator errors. It monitors the burner block assembly and controls the furnace purge sequence, oil gun operation in pair or elevation mode, and high energy arc igniter system to safely initiate combustion. The FSSS ensures maximum safety and efficiency during plant operation.
The presentation gives a basic idea of cooling towers in big industries including the Power Plants. The performance of cooling towers and the commonenly used terms with reference to the cooling towers are also discussed at length. Care to be taken while in freezing temperatures in the European countries is also discussed.
The document discusses reheater protection to prevent reheat tubes from starvation. It outlines the conditions that must be met for reheater protection to be enabled or disabled, including drum pressure above 30ksc, openings of high or low pressure bypass valves, feeders on or boiler firing, turbine valve positions, generator circuit breaker status, and bypass valve positions. It also indicates there is a loss of reheater protection signal.
Khagesh Kumar Chandra completed a vocational training project at the NTPC Limited SIPAT Super Thermal Power Station from June 21, 2012 to June 18, 2012. The project covered an overview of power plants, supercritical technology, and the main equipment used in power generation including boilers, turbines, and their maintenance. Khagesh gained hands-on experience of the equipment and processes during guided tours of the plant.
This document compares the efficiency of subcritical and supercritical pressure in thermal power generation. Supercritical pressure refers to pressure above the critical point of water at 374°C and 22.1 MPa, allowing steam to reach higher temperatures without changing phase. The document finds that supercritical units have higher efficiency (52-59%) than subcritical units (36-37%) due to higher steam parameters, reducing fuel consumption and emissions. Major power companies worldwide have adopted supercritical technology, and India is planning supercritical projects to improve efficiency and meet increasing energy demand.
The document provides details about Ranjan Kumar's summer practical training at the National Thermal Power Corporation (NTPC) plant in Kahalgaon, Bihar, India. It discusses the various departments and systems at the plant including coal handling, ash handling, the boiler and turbine systems, water treatment, the cooling tower, electricity generation equipment, transformers, the switchyard, and control and instrumentation. The NTPC Kahalgaon plant has a total installed capacity of 2340 MW and uses coal from nearby mines to generate electricity through its steam turbine units.
CESC, established in 1899, was the first thermal power generation company in India. It supplies power to the city of Kolkata and surrounding areas, serving over 2.4 million people. One of CESC's generating stations is the Southern Generating Station (SGS), located in Kolkata. SGS has two units with a generating capacity of 67.5 MW each, for a total capacity of 135 MW. It uses pulverized coal to power its boilers and generate electricity, which is then supplied to CESC's distribution network. SGS has achieved several performance milestones and certifications related to efficiency, environmental standards, and safety. It utilizes modern equipment and control systems to optimize power generation.
This document is a project report submitted by Sushant Kumar summarizing his one month vocational training at the Kanti Bijlee Utpadan Nigam Limited power plant. The report provides an overview of the plant's operations including the processes of generating electricity from coal, the main boiler and turbine components, and control systems used. It also describes the milling system for pulverizing coal and the light up process for initially igniting the coal furnace.
This document summarizes a seminar presented on practical training at the Kota Super Thermal Power Station. It describes the key parts of the power station including the coal handling plant, boiler, turbine, generator, water treatment plant, and switchyard. It provides details on processes like coal crushing and water treatment. The power station has a total generation capacity of 1240 MW across 6 units and uses coal from local mines to power its operations.
This document provides an overview of several power plants in Delhi, India including their specifications and components. It discusses the working of gas power plants which use gas turbines and heat recovery steam generators. It also describes the water treatment plant, generators, transformers, switchyard components like circuit breakers and insulators. The specifications of various equipment are listed. Finally, it discusses the merits and demerits of gas turbine and steam power plants.
The document presents details of a proposed 32 MW captive power plant project in an existing ferro alloy unit. The key points are:
1) The existing ferro alloy plant stopped operations 10 years ago due to unreliable power supply and the proposed CPP will generate 32 MW of power for the plant's operations.
2) The CPP will use Indonesian coal as fuel in a 140 TPH fluidized bed boiler to generate power. It will require 418 m3/day of water and generate 245 m3/day of effluents.
3) An electrostatic precipitator and stack of adequate height will be installed to control air pollutants from the boiler and ensure they meet standards after dispersion.
This document provides an overview of supercritical boiler technology. It begins with definitions of critical pressure and how it differs from subcritical boilers. It then compares the Rankine cycles of subcritical versus supercritical units. Key differences highlighted include higher efficiencies, less emissions, and operational flexibility of supercritical units. The document discusses water wall designs, materials requirements, water treatment needs, and operational challenges of supercritical boilers. Overall it provides a high-level introduction to supercritical boiler technology.
The document is a training report submitted by Amit Kumar describing his one month training at the Kanti Bijlee Utpadan Nigam Limited power plant in Muzaffarpur, Bihar, India. It provides an overview of the plant, describing that it has two 110MW coal-fired generating units. It then summarizes the key components and processes involved in thermal power generation, including converting coal to steam in the boiler, using steam to power the turbine for mechanical energy, and generating electricity through the generator. It concludes by outlining the sections to be covered in the full report.
This presentation provides an overview of supercritical boiler technology. It discusses key concepts like supercritical pressure and how it differs from subcritical units. Supercritical boilers operate above the critical point of water where there is no distinction between liquid and gas phases. They have higher efficiencies than subcritical units due to higher temperatures and pressures. The presentation compares the design and operation of subcritical versus supercritical units and discusses challenges of supercritical technology like more stringent water chemistry requirements and metallurgical challenges.
Rajkumari completed a summer training program at the Narora Atomic Power Station (NAPS) in Uttar Pradesh, India. NAPS uses pressurized heavy water reactors fueled by natural uranium to produce 220 MW of electricity each through nuclear fission reactions. Rajkumari's report describes the key components and systems at NAPS including the reactor, turbine, electrical distribution, and safety systems.
This document provides an overview of the steam and power generation plant at IFFCO Aonla. It describes the main sections which include a steam generator, two gas turbine units, two heat recovery steam generators, and a mist cooling tower. It then discusses the steam generator and gas turbine units in more detail, providing specifications for components like the gas turbines, generators, heat recovery steam generators, distributed control system, mist cooling tower, and boiler feed water pumps. The overall purpose is to meet the plant's high pressure steam and electrical power demands through these steam and power generation systems.
Present and future trends in thermal desalination with possible solar applica...Dr. Hassan K. Abdulrahim
This document discusses present and future trends in thermal desalination, with a focus on potential solar applications. It provides an overview of large-capacity thermal desalination systems currently in use, including Multi-Stage Flash (MSF) and Thermal Vapor Compression (TVC)/Multi-Effect (ME) systems. The document then examines recent advances for improving the energy efficiency of MSF and TVC/ME systems, such as raising brine temperatures and modifying designs. It also considers using Mechanical Vapor Compression (MVC) instead of thermal vapor compression. Finally, the feasibility of solar applications for thermal desalination is discussed.
This document provides an overview and report on a vocational training project conducted by Tarun Kumar at the Kanti Thermal Power Station. It includes sections on acknowledging those who supported the training, an abstract describing the thermal power generation process, a table of contents, and sections covering topics like the power plant overview, generation process, boiler components, turbines, and control systems. The document aims to provide insight gained from Tarun Kumar's month-long industrial training placement at the thermal power facility.
Incepted in 2007, Urja Thermal Solutions is a prominent company engaged in the Manufacturing, Exporting and supplying of Thermal Solutions. The company is working under the valuable assistance of its Owner, Mr. Swapnil Gautam. His successful contribution has helped the company grow in leaps and bounds. The company is located in Mumbai, Maharashtra.
Philippe ANGLARET, the VP Business Development for Alstom Nuclear, presented the Turbine Island with its different characteristics and very impressive pictures.
Ntpc (national thermal power corporation) sipat mechanical vocational trainin...haxxo24
This document is a report submitted by Khagesh Kumar Chandra detailing his vocational training project at the NTPC Limited Sipat Super Thermal Power Station from June 21, 2012 to June 18, 2012. The project involved gaining an overview of the power plant including topics like super critical technology, basic power plant equipment and operations, boilers, turbines and their maintenance. Khagesh thanks the guides and HR department for organizing the training program and declares the report contains his original work.
Kota Super Thermal Power Station (KSTPS) is a coal-based power plant located in Rajasthan, India. It has a total installed capacity of 1240 MW generated across 7 units. The plant receives coal via train from nearby mines and uses water from the Chambal River. It employs a Rankine cycle with a coal handling plant, ash handling plant, electrostatic precipitators, turbo generators to produce power, and a cooling system using hydrogen. Transformers are used to step up the voltage from the generators to connect to the grid.
Similar to Indian scenario of super critical power plants issues and challenges by ntpc part 1 (20)
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Indian scenario of super critical power plants issues and challenges by ntpc part 1
1. Indian Scenario of Super Critical
Power Plants
Issues and Challenges
T K Seal - GM(COS-OPN)
D.Bose -AGM(COS-Commng)
2. Supercritical Units –Indian scenario
1. Power scenario in India
2. What is Supercritical Technology
3. Benefits of Supercritical Technology
4. Supercritical Units in India
5. Profile of NTPC
6. Sipat & Barh –Supercritical Units of NTPC
7. Chemistry Regime
8. Boiler Control- Sliding Pressure Operation
9. Issues & Challenges
10. Sipat - Performance at a Glance
11. Q & A
Contents
3. Coal 167208
Gas 23062
Diesel 994
Nuclear 5780
Hydro 41997
Renewable 35777
Total 274818
Installed Capacity( MW)*
Indian Power Mix
*Excluding captive generation capacity (40726 MW)
6. Reduced emission for each Kwh of electricity generated
1% rise in efficiency reduces the CO2 emission by 2-3%
The Most Economical way to enhance efficiency
Fuel cost saving : Economical
Operating Flexibility
Reduced the Boiler size / MW
Reduced Start-Up Time
WHY SUPER CRITICAL TECHNOLOGY
7. Critical is a thermodynamic expression describing the sate of a fluid beyond
which there is no clear distinction between the liquid and gaseous phase.
The critical pressure & temperature for water are
Pressure-225.56 kg/cm2
Temperature -374.15oC
A boiler operating at a pressure above critical point is called ‘supercritical
boiler’
A point where boiling water and dry saturated line meet so that associated
latent heat is zero
Supercritical
15. NTPC’s total installed capacity is 45,548 MW in Country’s total installed capacity
of 274817.94 MW.
NTPC’s share in country’s total power generation is 23.81%
During 11th plan 9,610 MW was added, exceeding the target of 9,220 MW
Out of 24 ( 18 NTPC + 6 JV’s) nos. coal based plants, 6 stations achieved PLF of
more than 85 %
NTPC plans to add 14,038 MW capacity during 12th plan period (of which 8445
MW has been already added till August 2015) .
Projects totaling 23004 MW ( 21 nos) are under construction
NTPC has made it’s presence in Renewable by commissioning 8 nos Solar PV
plants with total capacity of 110 MW.
NTPC has also made forays into hydel generation,(recently 4x200 MW Koldam
has started it’s commercial operation), coal mining, power distribution & trading,
solar energy and entered into JV’s with SAIL & other state power utilities
16. NTPC Projects with Super Critical Boilers
Commissioned Units ( 3300 MW)
Sipat (3x660 MW)
Barh (2x 660 MW)
Under Commissioning ( 6640 MW)
Kudgi (3x800 MW)
Lara (2x800 MW)
Solapur (2x 660 MW)
Mouda –II (2X660MW)
17. NTPC Projects with Super Critical Boilers
Upcoming Projects - under different phase of
construction ( 9520 MW)
Meja (2x660 MW)
Khargone (2x 660 MW)
North Karanpura ( 3x660 MW)
Tanda II (2x 660 MW)
Gadarwara (2x800 MW)
Barh I (3x 660 MW)
20. Sipat : Boiler package supplier – Doosan Heavy Industries, South Korea
: Turbine package supplier – Power Machines, Russia
Sipat 660 MW Boiler :
• Once through supercritical, Two pass, Balanced draft, Out door
• Furnace width – 18816 mm, depth – 18144 mm, volume – 21462 m3
• Super Heater: Multi stage with panel, platen, pendant section
• Reheater: Multi stage type (LTRH & FINAL RH)
• Steam output parameters: at BMCR
Main steam : 256 ksc, 5400C, 2225 T/hr
Reheat steam: 48.3 ksc, 5680C, 1742 T/hr
• Design coal flow : 438 T/hr
Super critical units –NTPC Experience
21. 1. Fans
ID Fan : Supplier : FlaktWoods, Sweeden
Type : PFSU – 450 – 300 – 08
FD Fan : Supplier : FlaktWoods, Sweeden
Type : PFSU – 280 – 112 – 04
PA Fan : Supplier : FlaktWoods, Sweeden
Type : PFTU – 200 – 100 – 02
2. Air Preheaters
SAPH : Supplier : Doosan
Type : 31.5 – VI – 1900
PAPH : Supplier : Doosan
Type : 26.0 – VI – 1800
3. Mills
Vertical Bowl Mill 10 nos. – XHPS 1103
4. Coal Feeder
Gravimetric feeder 10 nos. – 36 inch
5. Boiler Recirculation Pump (BRP)
Make : Hayward Taylor, England
Type : Wet stator, Glandless, Single section sing discharge
pump
6. Oil elevations : 5 nos. (AB, CD, EF, GH & JK)
BOILER AUXILIARIES :
Super critical units –NTPC Experience
22. Sipat 660 MW Turbine :
• Turbine Model: K-660-247 (LMZ, Russia)
• HP Turbine
1 no. HP turbine, 17 stages
HP turbine has nozzle governing system
2 nos. HP stop valves, 4 nos. HP control valves
1 impulse stage + 16 reaction stages
• IP Turbine
1 no. IP turbine, 11X2 stages
IP turbine has throttle governing system
2 nos. IP stop valves, 4nos. IP control valves
22 nos. impulse stages
• LP Turbine
2 nos. LP turbines, (5X2 + 5X2) stages
20 nos. impulse stages
• Number of journal bearing for turbine – 8, Number of journal
bearings for generator – 4.
• 2 nos. MDBFP (30% each) & 2 nos. TDBFP (50% each)
• Steam turbine parameters
Before HPSV : 247 ksc, 5370C, 2023 T/hr
Before IPSV : 43 ksc, 5650C, 1681 T/hr
• Number of HP heaters : 6
• Number of LP heater : 4
Super critical units –NTPC Experience
23. SIPAT PROJECT KEY MILE STONES
UNIT # 1 UNIT # 2 UNIT # 3
Boiler Hydro Test 06.01.2007 27.07.2007 14.02.2009
Boiler Chemical
Cleaning
03.09.2010 08.06.2011 26.01.2012
Boiler Lightup 26.10.2010 23.12.2011 26.08.2011
Steam Blowing 13.01.2011 13.08.2011 19.02.2012
Synchronization 18.02.2011 02.12.2011 01.04.2012
Full Load 28.06.2011 24.12.2011 02.06.2012
Commercial Operation 01.10.2011 25.05.2012 01.08.2012
Super critical units –NTPC Experience
25. KEY FEATURE- OXYGENATED TREATMENT
PROVIDES LONG TERM PROTECTION OF PRE BOILER SYSTEM BY FORMING
HAMETITE LAYER.
CPU OPERATING PERIOD WILL BE MORE DUE TO LOW CONDENSATE AMMONIA
CONTENT
IRON TRANSPORT WILL BE REDUCED BY 90%
LESS GENERATION OF CRUD
REDUCTION IN CHEMICAL CLEANING FREQUENCY
REDUCTION IN OUTAGE TIME AND FASTER START UP
FAC WILL BE MINIMIZED
ALL THESE LEAD TO VERY LESS BTF
26. SCHEMATIC OF OXIDE GROWTH AND MORPHOLOGY
UNDER 0XIDISING AVT AND OT
2 Fe3O4 + 0.5 02 = 3 Fe2O3
27. FEED WATER PARAMETERS
S.NO Parameter Units Normal Operation During
Start up
Alkaline water
Treatment
Oxygenated
Treatment
1 PH Min 9.0 8-8.5 Min 9.0
2 Cation Conductivity,
ms/cm
ms/cm Max 0.2 <0.15 Max 0.5
3 Dissolved Oxygen ppb < 5 30-150 Max 100
4 Iron ppb < 2 < 2 < 20
5 Sodium ppb < 2 < 2 < 10
6 Silica ppb <10 < 10 < 30
7 Turbidity NTU <2 < 2 <5
28. OXYGENATED TREATMENT SYSTEM AT
SIPAT – OXYGEN DOSING
Dosing is being carried out in CPU outlet and
Deaerator outlet
The cycle oxygen is controlled by flow control
valve having a automatic controller.
The injection control is automatically adjusted
by Feed water flow and residual dissolved
oxygen and set point.
DO should be in the range of < 20 ppb in
condensate.
29. STEAM WATER ANALYSIS SYSTEM (SWAS)
FOLLOWING IS THE PROCESS MONITORING FOR CHEMICAL CONTROL OF
STEAM AND WATER
S.NO SYSTEM TYPE OF MEASUREMENT
1 MAKE UP DM WATER SP.COND., CATION CONDUCTIVITY
(ACC)
2 CEP DISCHARGE pH, ACC, Na, DO, SP.COND.,
3 CONDENSATE POLISHER O/L pH, ACC, Na, SILICA, SP.COND.,
4 DEAERATOR OUTLET DO
5 FEED WATER AT
ECONOMIZER INLET
pH, ACC, COND.,HYDRAZINE,SILICA,
TURBIDITY
30. STEAM WATER ANALYSIS SYSTEM (SWAS)
FOLLOWING IS THE PROCESS MONITORING FOR CHEMICAL CONTROL OF
STEAM AND WATER
S.NO SYSTEM TYPE OF MEASUREMENT
6 VENT HEADER OF BOILER
(SEPARATOR OUTLET
STEAM)
ACC, SP.COND., HYDRAZINE, SILICA
7 MAIN STEAM pH, ACC, Na, SILICA, SP.COND.,
8 WATER SEPARATION
STORAGE TANK OF BOILER
CATION CONDUCTIVITY(ACC)
9 REHEATED STEAM CATION CONDUCTIVITY(ACC)
10 TG ECW COOLING WATER pH
32. Constant Pressure Control
Above 90% TMCR The MS Pressure remains constant at rated pressure
The Load is controlled by throttling the steam flow
Below 30% TMCR the MS Pressure remains constant at minimum
Pressure
Sliding Pressure Control
Boiler Operate at Sliding pressure between 30% and 90% TMCR
The Steam Pressure And Flow rate is controlled by the load directly
BOILER LOAD CONDITION
33. Sliding pressure operation
Variable pressure operation (sliding pressure operation) is
desired in all modern power plants because it provides more
efficient part load operation.
The loss due to constant pressure operation at low load is always
a concern for the utility.
The vertical tube supercritical boiler can provide variable
turbine pressure operation to gain the thermodynamic
advantage of variable pressure.
Thus the turbine efficiency advantages are obtained by the
savings in boiler feed pump power associated with true variable
pressure operation.
34. 1. No additional pressure loss between boiler and turbine
2. Low Boiler Pr. at low loads
- Less fatigue of Pr. part components
- Longer life of all components, Less wear of components
- Less Maintenance
3. Lower thermal stresses in the turbine during load changes
4. Overall reduction in power consumption and improved heat rate
ADVANTAGES OF SLIDING PRESSURE OPERATION
37. Replacement of Grade 23 Pipes and
Fittings
Issue of absence of appropriate microstructure
following normalizing heat treatment in thick
walled Grade 23 pipes and fittings .
In order to avoid inconvenience during operation in
future, It was recommended to replace all Grade
23 pipes and fittings with Grade 91 material
Headers replaced- SH Division panel outlet ( 2nos),
Platen SH outlet, Final SH inlet and their
connecting pipes.
38. Issues related to Welding Joints of T 23 Tubes
Super critical units –NTPC Experience