Internationale Energiewirtschaftstagung TU Wien 2015

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1 Internationale Energiewirtschaftstagung TU Wien 2015 Techno-economic study of measures to increase the flexibility of decentralized cogeneration plants on a German chemical company Luis Plascencia, Dr. Felipe Toro, Dr. Marian Klobasa Vienna, February 07th, 2015

2 Overview presentation Objectives Methodology Alternative technical configurations Operation simulation Results Conclusions 1

3 Objective Evaluate alternative technical configurations composed of cogeneration plants and thermal stores which could improve the flexibility of electricity and heat production Simulate their operation under the EEX and evaluate its profitability accounting for current CHP subsidies schemes 2

4 Methodology Attain status quo of energy production Format alternative technical configurations (T1 & T2) concerning optimal heat load and thermal store size Simulate T1 and T2 s operation in combination with thermal store under influence of EEX Assess their profitability through NPV and dynamic payback time analysis compared vs. current state 3

5 Alternative technical configurations Following: (T1) Gas turbine: : 1,60 MW Power-to-Heat ratio : 0,41 : 3,90 MW Investment value : : 0,37 Specific operational costs : 0,015 /kwh el : 0,53 KWK-G Bonus : (T2) Reciprocal engine: : 4,00 MW Power-to-Heat ratio : 1,04 : 3,80 MW Investment value : : 0,44 Specific operational costs : 0,0104 /kwh el : 0,42 KWK-G Bonus : Thermal store : 7,00 MW Source: BHKW Kenndaten 2011, Schaumann, G.: Kraft-Wärme Kopplung 2010, WSEAS

6 Simulation Calculate the price of producing energy in the cogeneration unit Variate the CHP operation according to the cheapest source of electricity, its own or from external providers. ; Simulated the operation according to this premise and dispatch the surplus heat to other hours according to demand 5

7 Results HEAT GENERATION 6

8 Results ELECTRICITY GENERATION 7

9 Results ELECTRICITY GENERATION T T CURRENT CHP External % 8

10 Results HEAT PRODUCTION T T CURRENT CHP Aggregates % 9

11 Data variables Input variables for NPV and payback-time calculations CHP bonus Heat storage bonus Electricity price Gas price Price of selling CHP-electricity 1,8 ct/kwh(el) (2014 base) 30% of the Heat store s total investment value 101,72 /MWh (2009 base) 41,58 /MWh (2009 base) 38,88 /MWh (2014 EEX) Rate of interest 7% Years of operation 15 Source: BDEW Bundesverband der Energie- und Wasserwirtchaft 10

12 Results Current State T1 T2 Energy costs ( ) Investment ( ) NPV ( ) Payback (years) - 6,4 8,0 11

13 Conclusions The flexibility of the cogeneration plant was improved, due to the plausibility of improving the profitability of operation under the influence of the EEX and reducing the share of power generation from the aggregates In the case of not operating under the EEX, a 3% increase on total energy products costs for T1 and 5 % for T2 would be attained. Further improvements could be used with combination of longer term thermal storage and reducing the operation of the CHP unit under partial load. A reasonable relation between when is profitable for the plant to run under partial load and the relation with the heat aggregates could determine more accurate values for this study The values only represent data for one year of operation, further review on dynamic energy demand are necessary for further periods of time. 12

14 Thank you for your attention! IREES GmbH Schönfeldstraße 8, Karlsruhe, Deutschland 13

15 References BHKW Kenndaten 2011;Quelle: vom 2011 Sciencedirect (2013): Energy Storage: Application and challenges;quelle: vom 12.September.2013 Science Direct (2010): Modeling of thermal energy storage system coupled with combined heat and power generation for the heating requirements of a University Campus;Quelle: vom 15.Februar.2010 Prognos, Maßnahmen zur nachhaltigen Integration von Systemen.Quelle: vom 11.Juli.2013 Schaumann, G.: Kraft-Wärme Kopplung; 4. Edition,Springer; 2010, Bibliothek Uni Kassel (2010): Dieselmotor-Kraft-Wärme-Kopplungsanlagen im Kontext der Integration Erneuerbarer Energien in die Energieversorgung;Quelle: vom Science direct (2009): Feasibility of CHP-Plants with thermal sotres in the German sport market;quelle: vom 25.April.2009 WSEAS (2011): The use of thermal energy storage for energy system based on cogeneration plant;quelle: 09.pdf?CFID= &CFTOKEN= ; vom 14.March.2011 Zahoransky, R.: Energietechnik. Systeme zur Energieumwandlung; 5. Edition,Springer; Stuttgart 2010,

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