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Renewable energy balancing with thermal grid support

Brecht Zwaenepoel (UGent) , Joke Vansteenbrugge (UGent) , Tine Vandoorn (UGent) , Greet Van Eetvelde (UGent) and Lieven Vandevelde (UGent)
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Abstract
Waste heat valorisation in process industry is a common strategy today. The residual heat is converted to electricity by using steam turbines or organic Rankine cycles. As this energy conversion is likely constructed as an integral cooling capacity for the primary process, loss of electricity production will result in reduced process cooling and hence production capacity loss. This restriction prevents these generators to deliver supporting services to the electrical grid. In this paper, it is proven that coupling waste heat recovery with a district heating network provides flexibility to the electricity generation while ensuring cooling capacity to the process. This flexibility can be utilised by a Virtual Power Plant (VPP), e. g., to compensate for the variable output of renewable energy sources. Today, the power fluctuations are only compensated by traditional power plants (gas, coal) due to the scale and flexibility of these power plants. In this paper, a strategy is defined to balance variable (renewable) production with industrial waste heat. As such, some grid support tasks can be transferred from the central power plants to decentralised generation units. The backup of the variable sources is provided by utilising the local available capacity, while maintaining or improving energy efficiency of exothermal industrial processes. Operational boundaries are defined and new challenges identified. In this paper, firstly, the heat sources available for this concept are identified. Secondly, the properties of the different conversion technologies are described. Thirdly, the benefits of a virtual power plant utilising waste heat are determined. Finally, this VPP concept is verified by means of a case study in Belgium, Ostend Energy port. Available heat from biomass, chemical processing and waste incineration is used as primary energy source to balance local renewable production.
Keywords
STORAGE, HEAT, INTEGRATION, grid support, virtual power plant, waste heat, renewable energy

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Chicago
Zwaenepoel, Brecht, Joke Vansteenbrugge, Tine Vandoorn, Greet Van Eetvelde, and Lieven Vandevelde. 2013. “Renewable Energy Balancing with Thermal Grid Support.” In Chemical Engineering Transactions, ed. Petar Varbanov, Jirí J Klemeš, Panos Seferlis, Athanasios I Papadopoulos, Spyros Voutetakis, and S Pierucci, 35:535–540. Milano, Italy: AIDIC Servizi.
APA
Zwaenepoel, B., Vansteenbrugge, J., Vandoorn, T., Van Eetvelde, G., & Vandevelde, L. (2013). Renewable energy balancing with thermal grid support. In Petar Varbanov, J. J. Klemeš, P. Seferlis, A. I. Papadopoulos, S. Voutetakis, & S. Pierucci (Eds.), Chemical Engineering Transactions (Vol. 35, pp. 535–540). Presented at the 16th International conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction (PRES 2013), Milano, Italy: AIDIC Servizi.
Vancouver
1.
Zwaenepoel B, Vansteenbrugge J, Vandoorn T, Van Eetvelde G, Vandevelde L. Renewable energy balancing with thermal grid support. In: Varbanov P, Klemeš JJ, Seferlis P, Papadopoulos AI, Voutetakis S, Pierucci S, editors. Chemical Engineering Transactions. Milano, Italy: AIDIC Servizi; 2013. p. 535–40.
MLA
Zwaenepoel, Brecht, Joke Vansteenbrugge, Tine Vandoorn, et al. “Renewable Energy Balancing with Thermal Grid Support.” Chemical Engineering Transactions. Ed. Petar Varbanov et al. Vol. 35. Milano, Italy: AIDIC Servizi, 2013. 535–540. Print.
@inproceedings{3223995,
  abstract     = {Waste heat valorisation in process industry is a common strategy today. The residual heat is converted to electricity by using steam turbines or organic Rankine cycles. As this energy conversion is likely constructed as an integral cooling capacity for the primary process, loss of electricity production will result in reduced process cooling and hence production capacity loss. This restriction prevents these generators to deliver supporting services to the electrical grid. In this paper, it is proven that coupling waste heat recovery with a district heating network provides flexibility to the electricity generation while ensuring cooling capacity to the process. This flexibility can be utilised by a Virtual Power Plant (VPP), e. g., to compensate for the variable output of renewable energy sources. Today, the power fluctuations are only compensated by traditional power plants (gas, coal) due to the scale and flexibility of these power plants. In this paper, a strategy is defined to balance variable (renewable) production with industrial waste heat. As such, some grid support tasks can be transferred from the central power plants to decentralised generation units. The backup of the variable sources is provided by utilising the local available capacity, while maintaining or improving energy efficiency of exothermal industrial processes. Operational boundaries are defined and new challenges identified. In this paper, firstly, the heat sources available for this concept are identified. Secondly, the properties of the different conversion technologies are described. Thirdly, the benefits of a virtual power plant utilising waste heat are determined. Finally, this VPP concept is verified by means of a case study in Belgium, Ostend Energy port. Available heat from biomass, chemical processing and waste incineration is used as primary energy source to balance local renewable production.},
  author       = {Zwaenepoel, Brecht and Vansteenbrugge, Joke and Vandoorn, Tine and Van Eetvelde, Greet and Vandevelde, Lieven},
  booktitle    = {Chemical Engineering Transactions},
  editor       = {Varbanov, Petar and Kleme\v{s}, Jir{\'i} J and Seferlis, Panos and Papadopoulos, Athanasios I and Voutetakis, Spyros and Pierucci, S},
  isbn         = {9788895608266},
  issn         = {2283-9216},
  keyword      = {STORAGE,HEAT,INTEGRATION,grid support,virtual power plant,waste heat,renewable energy},
  language     = {eng},
  location     = {Rhodes, Greece},
  pages        = {535--540},
  publisher    = {AIDIC Servizi},
  title        = {Renewable energy balancing with thermal grid support},
  url          = {http://dx.doi.org/10.3303/CET1335089},
  volume       = {35},
  year         = {2013},
}

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