Energy balance analysis of cogeneration power plant and ... - JINR

University of West Bohemia
Faculty of electrical engineering
Energy balance analysis of
cogeneration power plant and
design of innovation
Ales Kaplan

Energy balance analysis of cogeneration
power plant and design of innovation
Content
1. Introduction
2. Technical parameters of cogeneration
power plant Plzeňská teplárenská a.s.
3. Energy balance and self-consumption
4. Design of innovation for more effective
operation
5. Conclusion
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1. Introduction
Cogeneration power plants
in Pilsen:
• Plzeňská energetika
• Plzeňská teplárenská
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2. Technical parameters of cogeneration power
plant Plzeňská teplárenská a.s.
2.1. Boiler part
Type of boiler power efficiency Start of
operation
2x hot water boiler K2, K3 –
brown coal
2x high pressure steam boiler
K4, K5 – brown coal
1x high pressure steam boiler
K6 – coal + biomass
1x high pressure steam boiler
K7 – biomass
6 boilers 495,6
MWt
69,6 MWt 81% 1976
256 MWt 86% 1986
135 MWt 92% 1999
35 MWt 91% 2010
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2. Technical parameters of cogeneration power
plant Plzeňská teplárenská a.s.
2.2. Turbine part of power plant
turbine Power of generator p a (MPa) t a ( C)
Steam turbine - TG1 55 MWe 13,3 535
Steam turbine – TG2 50 MWe 13,3 535
Steam turbine – TG3 11,5 MWe 6,6 485
3 turbines 116,5 MWe
p a = admission pressure; t a =admission temperature
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2. Technical parameters of cogeneration power
plant Plzeňská teplárenská a.s.
2.3. Basic scheme of power plant
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3. Energy balance and self-consumption
3.1. Energy balance of primary fuel – year 2010
2 481 720; 24,05%
38 084; 0,37%
7 798 510; 75,58%
energy of brown coal (GJ) energy of biomass (GJ) energy of nature gas (GJ)
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3. Energy balance and self-consumption
3.2. Energy balance in power plant - 2010
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3. Energy balance and self-consumption
3.3. Distribution of heat in heating system - 2010
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3. Energy balance and self-consumption
3.4. Self-consumption of electricity
• The most important devices:
hot water pumps: 5,8 MW
boiler pumps: celkem 8,88MW
ventilators of burning products: 1,44MW
air ventilators: 3,1MW
coal mills: 2,1MW
Self-consumption:
• 26MW – power of devices – 22% - compare with output
power of generators
• 4,2% - compared with energy of primary fuel energy in
2010
• 18,56% - compared with energy of generated electricity
2010
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4. Design of innovation for more effective operation
• calculating flow of steam based on pressure difference
• pressure loss
• inaccurate measuring of admission steam flow to the
turbine → inaccurate control of generating electricity
• Possible principles of measuring:
Pitot/Annubaric tube
small turbine flowmeters
electromagnetic flowmeter
ultrasonic flowmeter
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4. Design of innovation for more effective operation
Ultrasonic flowmeter:
• transmission of acoustic wave through medium
• no pressure loss
• conductivity of medium doesn't required
• progress in research of this principle
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4. Design of innovation for more effective operation
Required parameters of steam = demands on flowmeter
Steam pipe for TG1,2
Steam pipe for TG3
Temperature ( C) 535 485
Pressure (MPa) 13,3 6,6
Flow (tones/hour) Max. 350 Max. 49
Diameter of pipe TG1: DN 200
TG2: DN 250
DN 200
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4. Design of innovation for more effective operation
Ultrasonic flowmeter
Name OPTISONIC 8300
Diameter DN 100 600
Temperature
Max. 540 C
Pressure
Max. 25MPa
Measuring accuracy 1%
Prize
50 000 € ≈ 1 250 000 CZK
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Conclusion
• Conclusion of power plant operation in 2010:
gross efficiency η = 59,2%
efficiency η = 54,6%
• Conclusion of innovation:
Accurate measuring of steam flow without pressure loss
rising of efficiency approximately 0,5‰ (guessed value)
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That’s all…
Thank you for your attention
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