Technology for Process Heat Applications. and Solar Field Optimization

Transcription

1 Technology for Process Heat Applications and Solar Field Optimization

2 erfis PARABOLIC TROUGH Technical Data Sheet Parabolic Trough Collector Design Solar Field Engineering Construction Erection Fields of Application Solar Electricity Solar Water Desalination Solar Cooling Solar Industrial Process Heat Erfis GmbH [2] October 2014

3 Erfis innovations: Use of cold bended glass (low iron hardened float glass) Industrial series production (standard components) Modular construction for tailor-made solutions More than 10 times faster erection on site Multi-drive tracking system Erfis GmbH [3] October 2014

4 Technical data of the parabolic trough collector Aperture Length 8.4 m ft Aperture Width 6.4 m ft Focal Length 1.7 m 5.66 ft Rim Angle 166 Geometric Concentration Aperture Area Gross Aperture Area 51 m² square Net Aperture Area 46 m² feet square feet Tracking Controller Number of Single Axis Drives 2 10 Sun-Tracking Accuracy +/ Type of Drive System electromechanically driven Controller Communication wired Total Range of Travel 315 Maximum Collector Rotation Speed 30 /min 1 Defined as: (Aperture Width) / (Receiver Tube Diameter) 2 Drive with slewing-ring-system. Erfis GmbH [4] October 2014

5 Heat Transfer Low Temperature up to 400 C Heat Transfer Fluid Therminol VP1 Typical System Operating Temperature Range (inlet) 290 C 554 F Typical System Operating Temperature Range (outlet) 400 C 752 F Heat Transfer Low Temperature up to 270 C Heat Transfer Fluid Therminol 66 Typical System Operating Temperature Range (inlet) 170 C 338 F Typical System Operating Temperature Range (outlet) 270 C 518 F Stability / Wind Load Maximum Wind Speed (Stow) Maximum Wind Speed (Operation) 145 km/h 90.1 MPH 5s gust 65 km/h 40.4 MPH 5s gust Performance Intercept Factor Sun on Tube 70mm 98.5% Thermal Efficiency 72.0% Design Point Thermal Output SCA 3,4 Indicative Design Point Gross Electric Output kw 143 kw Maximum Installed Slope 3% 3 2 Defined as: (Gross Thermal Power) / (Solar Power) at 850W/m of direct normal incident solar radiation and 350 C heat transfer fluid temperature. 4 SCA = Solar Collector Assembly, consists of 20 SCEs = Solar Collector Element. 5 Based on 1 MW ORC turbine with 25 % efficiency. Erfis GmbH [5] October 2014

6 Mirror (thin-glass) Glass thickness 2.0 mm Low iron hardened float glass with optimized solar transmission Copper-containing silvering-system with increased corrosion protection Reflexion >= 93.9 % 3-coat paint system for maximum resistance against environmental influences Mirror module (substructure) Precision-manufactured elements from 1.5 mm stainless steel Full assembling on site, no pre-fabrication Steel construction Welded steel structure conforming to DIN standards High accuracy by CNC-production Corrosion protection adaptable to regional environmental conditions Erfis GmbH [6] October 2014

7 Drive and Tracking Each drive consists of a slewing ring and a motor gear with a central controller Range of travel with sun-tracking (uniaxially) up to 315 Remote supervision by VPN (erfis Control System) 100% reliability by double control circuits (redundancy) Mechanical safety device concept for emergency situations Recording of the locally relevant climatic and process data Speed ratio: 1/2000 Output speed [r/min]: Output torque [Nm]:400 Peak torque [Nm]: 475 Gearing (motor gear): 105,09 Gearing (slewing ring): 54 Erfis GmbH [7] October 2014

8 Swivel Joint THER-EX 450 Swivel Joint for high temperature range (up to 400 ) Special design for CSP-application with weld-on connection Cycles-to-failure: 8000 Load change/day: 600/800 Rotation angle: 360 Medium (heat carrier): thermal oil Pressure: PN 40 Torque towards: 55Nm Plain Bearing Maintenance-free Self-lubricating Light-weight design with honeycomb structure Long durability Vacuum Receiver Tube e.g. Schott PTR 70 Length 4,060 mm (159.8 inch) at 20 C (68 F) Absorber tube diameter 70 mm (2.755 inch) Solar absorption 95% Thermal emission < 10% at 400 C (752 F) Borosilicate-Glass with anti-reflex coating Solar transmission 96% Vacuum 1*10-3 mbar Erfis GmbH [8] October 2014

9 Further Advantages Fundamental Strength Robust collector structure for a long life span Materials are worldwide available Low energy consumption for production (concerning cold bending mirrors, etc.) Modular construction allows flexible planning and adaption to site location Different receiver tube systems can be used (Siemens, Schott, etc.) Substitutable materials (less dependence on suppliers and raw materials) Steel Construction Application of standard steel profile Low quantity of welded joints Significant reduction of components Tailor-made corrosion protection class Simple foundation and anchoring Construction is adaptable to different wind loads Different reflecting systems can be used (position of the focal line is changeable) On account of bigger material thickness, higher corrosion resistance (longer life span) Tough and light bearing Large variation possibilities concerning customer's requests No leakage by application of innovative swivel joints in the circulatory binding Logistics All dimensions of the components are so conceived that Iso-sea freight containers can be optimally filled (minimizing logistic costs) Production World-wide availability of steel profiles Adhesives world-wide available Operation / Service Maintenance-free bearings Easy replacement of the mirror modules if necessary Erfis GmbH [9] October 2014

10 Mirror Modules High precision forming results to a higher Intercept factor Cold bending of mirrors reduces process steps, costs and energy expenditure compared to the thermal bending process Robust at transport, handling, storage, etc. In case of damage, incurrence of small and not-sharp edged fragments is lowering risk of secondary damage Higher thermal shock resistance of the glass Residual load capacity of the varnish system is similarly like laminated glass (in the case of damage the varnish system holds together the single glass splinters up to a certain degree) Form-fit to the support system (thus an additional adjustment is void) By the adhesive system, possible form inaccuracies in the carrier system can become balanced Cold bending process avoid ripple creation in the glass Silvering flat glass is more economical Constant reflecting layer thickness, thereby constant reflecting rate above the whole reflecting surface Constant varnish layer thickness causes very proof sealing Flexibility at the mirror dimensions (targeting standards in the glass industry) Higher scratch resistance than polymer or aluminium solutions Drive and Tracking Use of multiple tracking drivers causes lower torsion in the SCA (Solar Collector Assembly) Backlash-free electromechanical tracking system (position exactness: o,o5 ) Assembly Support construction can be built up on the project area (on-site construction) High prefabrication level Low qualification for staff required for on-site erection Increasing robustness of components through higher material thickness Erfis GmbH [10] October 2014

11 Qatar Pilot Plant CSP technology with water desalination, process heat and electricity production. Erfis GmbH [11] October 2014

12 Integration of solar process heat into industrial core processes for fuel substitution energy saving projects. Erfis GmbH [12] October 2014

13 Contact Erfis GmbH Flughafenstrasse Erfurt Germany Mr. Alexander von Sperber Phone Mr. Lukas Kirscht Phone Copyright The content and works published in this brochure are governed by the copyright laws of Germany. Any duplication, processing, distribution or any form of utilisation beyond the scope of copyright law shall require the prior written consent of the author or authors in question. Erfis GmbH [13] October 2014