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CHP and thermal energy storage

Publicerad 2017-09-22

Om uppdragsgivaren
Facts about RISE formerly SP Technical Research Institutes of Sweden:
- The largest technical research institute of Sweden
- Present across the whole of Sweden. And more.
- 2 200 employees, 30 % with a PhD
- Turnover approx. 2,5 billion SEK 2016. SME clients responsible for approx. 30 %
- Run 100s of test and demonstration facilities, open for industry, SMEs, universities and institutes RISE is owner and partner in 60 % of all Sweden´s T&D-facilities

Beskrivning av examensarbetet
Research question

Given predicted future electricity prices and district heating demand, under what conditions would the use of thermochemical storage for CHP plants connected to district heating be economically feasible?

Background - TCP storage to maintain CHP efficiency

An increasing share of uncontrollable, volatile electricity sources such as wind and solar PV will require greater flexibility in energy systems to maintain power quality levels and avoid transmission bottlenecks. Variability of the electricity price in Sweden is predicted to triple by the year 2030. It is widely discussed that storage will therefore be an more important aspect in future energy systems.
Combined heat and power CHP plants adapt their output to the changing electricity price and heat demand from district heating. Sensible heat storage can be used to buffer the low-temperature CHP heat output and thus balance the mismatch between CHP operation and district heating demand, but such storage is usually intra-diurnal and may be insufficient to adapt to the increasing variations in CHP plant output when prioritising the tracking of electricity prices. The CHP plant may thus be forced to vary its output, running at sub-optimal efficiencies, or to cycle on/off more frequently, increasing running costs and decreasing its operational lifespan.
New thermochemical TCM storage techniques have reached commercial readiness and can store heat at the temperature levels produced by CHP plants. This technology can enable CHP boilers to run at optimal efficiency, whilst storing any excess high-temperature heat that is not currently needed to generate electricity. Electricity can also be used to charge such TCM storage and therefore provides additional flexibility for balancing the electricity grid.

Jay Hennessy
010 516 60 05


RISE Research Institutes of Sweden


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