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Energy storage system deals with sudden draws on the grid

12.08.2010
Time for a quick cuppa? When the final whistle blows, demand for electricity usually soars, causing a headache for energy companies.

Researchers at the University of Leeds and the Chinese Academy of Sciences have now found a way to manage these short-lived draws on the electricity grid that could halve the fuel needed.

The amount of electricity drawn from the national grid varies enormously at different times of day. It usually peaks in the early evening for a couple of hours after the mass exodus from school and work. Short-lived spikes are also common after major televised sporting events, during commercial breaks and in the morning hours.

But matching the highs and lows in demand with a steady supply is a major challenge. Energy companies typically top up a 'base' supply of energy with electricity from power plants that are just switched on to cope with the peaks. However, the gas-fired generators often used to feed these peaks are notoriously inefficient, expensive to run and sit idle for long periods of time. In short, the system wastes both energy and resources.

University of Leeds Professor of Engineering, Yulong Ding, and colleagues are proposing a more environmentally friendly system that would also be cheaper to run. Crucially, the system would store excess energy made by a plant supplying the 'base' demand and use this to supply the 'peaks' in demand - as and when they happen.

"This integrated system is truly novel," said Professor Ding, who led the research. "Because we are storing the excess energy for later, there is less need to ramp up the output of gas-fired plants whenever a peak in demand is expected, generating electricity that may simply not be used."

The key idea is to use excess electricity to run a unit producing liquid nitrogen and oxygen – or 'cryogen'. At times of peak demand, the nitrogen would be boiled – using heat from the environment and waste heat from the power plant. The hot nitrogen gas would then be used to drive a turbine or engine, generating 'top up' electricity.

Meanwhile, the oxygen would be fed to the combustor to mix with the natural gas before it is burned. Burning natural gas in pure oxygen, rather than air, makes the combustion process more efficient and produces less nitrogen oxide. Instead, this 'oxy-fuel' combustion method produces a concentrated stream of carbon dioxide that can be removed easily in solid form as dry ice.

Using such an integrated system, the amount of fuel needed to cater for peak demand could be cut by as much as 50%. Greenhouse gas emissions would be lower too, thanks to the greatly reduced nitrogen oxide emissions and the capture of carbon dioxide gas in solid form for storage.

"This is a much better way of dealing with these peaks in demand for electricity. Greenhouse gas emissions would also be cut considerably because the carbon dioxide generated in the gas-fired turbine would be captured in solid form."

"On paper, the efficiency savings are considerable. We now need to test the system in practice," Professor Ding said.

Full details of the system will be published in the International Journal of Energy Research.

The project was funded by the Engineering and Physical Sciences Research Council (EPSRC) and the Chinese Academy of Sciences.

For further information:

Paula Gould, University of Leeds press office: Tel 0113 343 8059, email p.a.gould@leeds.ac.uk

1. The paper, 'An integrated system for thermal power generation, electrical energy storage and CO2 capture', is available online in the International Journal of Energy Research (doi:10.1002/er.1753).

2. In the US, power plants supplying the 'peak load' on the electricity grid are only used for 90% of the time.

3. The Faculty of Engineering at the University of Leeds is ranked 7th in the UK for the quality of its research (2008 Research Assessment Exercise); an impressive 75% of the Faculty's research activity rated as internationally excellent or world leading.

With 700 academic and research staff and 3,000 students the Faculty is a major player in the field with a track record of experience across the full spectrum of the engineering and computing disciplines. The Faculty of Engineering is home to five schools: civil engineering; computing; electronic and electrical engineering; mechanical engineering; process, environmental and materials engineering.

Two thirds of students are undergraduates with the remaining third split evenly between taught masters and research degrees. The Faculty attracts staff and students from all around the world; one third of students are from outside the UK and representing over 90 different nationalities. www.engineering.leeds.ac.uk

4. The Engineering and Physical Sciences Research Council (EPSRC) is the UK's main agency for funding research in engineering and the physical sciences. The EPSRC invests around £850 million a year in research and postgraduate training, to help the nation handle the next generation of technological change. The areas covered range from information technology to structural engineering, and mathematics to materials science.

Paula Gould | EurekAlert!
Further information:
http://www.leeds.ac.uk

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