OFFPEAK POWER STORAGE ADVANCED ADIABATIC CAES Indraneel Bhandari

OFF-PEAK POWER STORAGE: ADVANCED ADIABATIC CAES Indraneel Bhandari

SUMMARY • Need for Storage. • Distributed energy storage and Utility scale storage. • Existing Diabatic CAES plants. • Advanced adiabatic compressed air energy storage. • Requirements for AA-CAES. • Pilot Plant Case Study – ALACAES.

NEED FOR STORAGE

Source: http: //css. umich. edu/sites/default/files/U. S. _Grid_Energy_Storage_Factsheet_CSS 15 -

WHY STORAGE? • Providing electricity at short notice. • Frequency regulation. • Peak shaving. • Overcoming the intermittent nature renewable sources. • More efficient use of Base Load plants. • Backup power in forms of spinning reserve. • Off-grid energy in emergencies.

Huntorf CAES, Germany Mc. Intosh CAES, Alabama • Huntorf Plant, Germany – 1978: 290 MW • Mc. Intosh CAES, Alabama, USA – 1991: 110 MW

Source: ETH Zurich, Dept. of Mechanical and Process Engineering, Institute of Energy Technology Basic operating principle of an AA-CAES plant. Electricity during times of low demand is used to drive a compressor. The heat contained in the compressed air is stored, and the cooled air is stored in a hermetically sealed reservoir. To generate electricity during periods of high demand, the air is released from the reservoir, absorbs heat from the storage, and is expanded through a turbine that drives a generator.

The steel door in the main plug holds the pressure while granting access to the plant when necessary. Source:

Inside the pressure cavity. Source:

THERMAL ENERGY STORAGE • Takes up the heat generated from the compression of the air. • High temperature packed-bed TES – based on cycling of temperature (20°C to 650°C). • Certain thermophysical property criteria have to be met for the materials being used. • Selected sedimentary or volcanic rocks, depending on application. • Proprietary concrete tiles for mechanical stability and insulation. Source: https: //twitter. com/ALACAES

Regions with geology favorable for CAES and class 4+ winds are superimposed to indicate ideal CAES plant locations. Source:

ADIABATIC COMPRESSED AIR ENERGY STORAGE. World Scenario: Features: • Various pilot plants: • Higher overall roundtrip efficiency. • ADELE, RWE – Germany. • Zero-emission. • Alacaes – Switzerland. • Enables Utility storage. • Shorter start-up time than 1 pumped hydro. • VAR support.

• [1]. “Concept. ” ALACAES, 3 Feb. 2017, alacaes. com/technology/concept/. Accessed 14 Sept. 2017. • [2]. “Compressed Air Energy Storage (CAES). ” Energy Storage Sense, 5 May 2017, energystoragesense. com/compressed-air-energy-storage/. Accessed 14 Sept. 2017. • [3]. U. S. Department of Energy: https: //energy. gov REFERENCES • [4]. “Grid energy storage. ” Wikipedia, Wikimedia Foundation, 6 Oct. 2017, en. wikipedia. org/wiki/Grid_energy_storage. • [5]. https: //www. youtube. com/user/coldfustion/videos • [6]. Yang C, Jackson RB. Opportunities and barriers to pumped-hydro energy storage in the United States. Renew. Sustain. Energy Rev 2011; 15: 839– 44 • [7]. Miner, Mark. “Compressed Air Energy Storage (CAES). ” Neural Energy Consulting, 1 Jan. 1970, www. neuralenergy. info/2009/06/caes. html. Accessed 16 Sept. 2017. • [8]. “Peaking power plant. ” Wikipedia, Wikimedia Foundation, 4 Oct. 2017, en. wikipedia. org/wiki/Peaking_power_plant. • [9]. https: //files. newsnetz. ch/file_upload/21/59/83/24/topelement_zooma ble_WIS_Druckluft. Kraftwerk. jpg

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