2.0 MW HYBRID SOLAR THERMAL WITH STORAGE
Plant type | Hybrid | Heat recovery from waste heat of cement factory | Solar collectors with pebble stone thermal storage |
Location | Ait Baha | Morocco |
Customer | Italcementi Group |
Solar field area | Aperture area: 6,159 m2 |
Nr. of string | 3 |
String length | 215 m |
DNI | 2,400 kWh/m2 year |
Storage capacity | 18 HR 12 hours |
ORC electric power | 2 MWe |
Turboden unit | Turboden 18 HR |
Thermal power | 4 MWth |
ONGOING PROJECTS
ONGOING PROJECT| 1
› ORC fed directly by saturated steam from solar field
› No thermal storage
Process description
Solar field produces biphase steam with quality about 0.5 (1). The steam flows into a thermal buffer equipped with recirculation system to feed the ORC with saturated steam (2) and to recirculate the liquid part back to the solar field (4).
In such configuration, the energy production for a 10,000 m2 absorbing surface (per MWel) plant can amount up to 1,900 equivalent hours in a site where the DNI is about 2,000 [kWh/m2 _year]
ONGOING PROJECT | 2
› ORC fed by thermal oil
› Thermal oil both as Heat Transfer Fluid and as storage medium
› Fresnel or small medium parabolic troughs solar collectors
› Two tanks direct thermal storage system
Process description
Turboden HRS units fed with thermal oil at about 300°C (point 2). Thermal oil back to the solar field at about 200°C (point 4)
In such configuration, the energy production for a 10,000–15,000 m2/MWel absorbing surface plant with a 1 equivalent hour thermal storage can amount up to 2,400 equivalent hours in a site where the DNI is about 2,000 [kWh/m2_year]
ONGOING PROJECT | 3
› ORC fed by thermal oil
› Thermal storage with molten salt
Process description
A non-pressurized, non-harmful synthetic oil is used in the solar field, working from 200°C (point 4) to 330°C (point 1)
Molten salt ternary mixture with a low freezing point is employed in the two tanks indirect high capacity thermal storage system.
In such configuration, the energy production for a 20,000–25,000 m2/MWel absorbing surface plant equipped with a 10–12 equivalent hours thermal storage, can amount up to 6,000 equivalent hours in a site where the DNI is about 2,000 [kWh/m2_year]