COMPRESSED AIR ENERGY STORAGE system of solar

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1. COMPRESSED AIR ENERGY STORAGE BY RENEWABLE ENERGY

2. INTRODUCTION Compressed Air Energy Storage (CAES) is an ambient air storage method in which air is compressed into a salt cavern or artificial cavern (Tank) and released later on for spinning a turbine.

3. COMPONENTS OF CAES Compressor Gas Turbine Recuperator Air Storage Inter Cooler Thermal Energy Storage (TES) Fuel (Natural Gas)

4. Technology (How it Work) The ambient air is compressed and stored in the air storage vessel. The compressor motor is run by off peak hour low price rate power or using natural renewable energy like solar or wind. The compressed stored air is expanded through turbine and heated using recuperator and inter-combustion chamber/ TES. The generator is coupled using clutch with both compressor and turbine.

5. TYPES OF CAES Diabetic Adiabatic with TES Adiabatic without TES Isothermal Ocean CAES

6. DIABATIC CAES A Diabatic Compressed Air Energy Storage System is based on the compression of air with releasing heat into surrounding by interstage or multistages of intercooler and storing into air storage cavern and tanks. When air is reheated by burning with natural gas mixture in combustion chamber to get heated high pressure air for rotating the turbine. Ex. Huntorf CAES Plant. Recuperator is use to recover the waste heat from the gas before releasing from the chimney. It reduces fuel consumption by 25%. Ex. McIntosh CAES Plant. Efficiency upto 45-55%

7. ADIABATIC CAES WITH TES A Adiabatic Compressed Air Energy Storage System is based on the compression of air without releasing heat into surrounding and storing air into storage cavern and tanks. The heat produced during compression is stored in Thermal Energy storage (TES) system. When air is discharges it is reheated by passing the air from TES and flow through the turbine The Air Storage cavern can store high amount of air. Efficiency upto 70-75%

8. ADIABATIC CAES WITHOUT TES An Adiabatic Compressed Air Energy Storage System is based on the compression of air without releasing heat into surrounding and storing air into storage cavern and tanks. The hot air due to compression is stored in Storage system. The Air Storage cavern can store less amount of air as the hot air occupy large space therefore bigger size Air storage System is required. Efficiency upto 70%

9. ISOTHERMAL CAES A Isothermal Compressed Air Energy Storage System is based on the compression of air Isothermally keeping the temperature constant. The heat from air compression is transferred to the expansion process. The heat generated is transfer at rapid rate to keep the temperature uniform in both processes. Efficiency upto 80%, Theoretically 100%

10. USE OF RENEWABLE ENERGY Solar Energy: Using Solar Energy Panels at Plains and Mountainous Zones. Wind Energy: Using Wind Turbine in Coastal Regions The motor of compressor is run with solar and wind energy Currently the grid power is use during off peak hours when low cost electricity available. Hurtorf CAES Power plant consumes 60 MW in 16 hrs. of grid electricity to compress and produce 290 MW in 4 hrs.

11. Solar and Wind Power As Hurtsoff Power Plant consumes 60 MW for compressing the air into cavern So installation of a 60 MW Solar or Wind can help us to generate 290 MW power. 60 MW Solar panel installation requires 125 Crore and area 1.6 sq. km Wind turbine available of 12MW and 17 MW offshore and 6MW onshore.

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