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  • 1. Solar & Biomass Hybrid5 MW Hybrid Solar Thermal + Biomass Plant Neha Energie
  • 2. TABLE OF CONTENTS Technology Overview Financial Overview Conclusions 2
  • 3. Plant Schematic – Hybrid Solar Thermal Biomass Plant Biomass Gasifier Two-Stage Boiler Electricity Heat Steam Exchanger Turbine GeneratorParabolic Troughs Condenser Pump 3
  • 4. Plant Operation – Hybrid Solar Thermal Biomass Plant Superheated steam required to generate useful power o Requires almost 80% of the energy from the boiler to reach saturated vapor phase. o Use solar energy for this purpose. x 3306 kJ/kg 400 20% 300 1097 kJ/kg 60% x x 2800 kJ/kg 200 20% x 600 psia isobar 100 498 kJ/kg 4
  • 5. Why Hybrid Solar + Biomass PlantSolar & biomass are the only renewable resources thatmake sense in most of the parts of India  Solar only approach can utilize either PV or solar thermal o Both suffer from low capacity factor in India due to tropical conditions (high humidity and rain showers)  Biomass only approach works but supply can be an issue, especially in drought conditions. o Results in variable O&M costs 5
  • 6. Major System Components Parabolic trough concentrator Biomass Gasifier Boiler (producer gas burner) Super heated steam turbine 6
  • 7. Parabolic Trough Concentrator Medium Temperature Parabolic Trough (MTPT) High efficiency and durable mirrorfilm technology Temperatures up to 300o C. Less thermal losses. Modular & scalable. Space frame light weight technology Ease in construction and tracking. Fig: MTPT pilot plant at Florida ( Source: SET Florida) 7
  • 8. MTPT - Technical Specifications TECHNICAL DETAILSConstruction Materials Aluminum and SteelReflective Surface Reflective FilmReflectivity 0.94Absorber Material SteelSelective Surface CermetAbsorber Envelope Borosilicate GlassMax Wind Speed tolerance 110 mphLife Expectancy 20 years TROUGH GEOMETRYModule Aperture Width 2.74 m 9 ftModule Aperture Length 12 m 39.4 ftModule Aperture Area 32.9 sq. m 354 sq. ftFocal Length 1.49 m 4.9 ftNumber of modules per Solar Collector Assembly (SCA) 8Total SCA length 100 m 328 ftNet Aperture Area 263 sq. m 2830 sq. ft 8
  • 9. Gasifier Gasification o Thermo-chemical process converts biomass into a gas. o The resulting gaseous compound is called Syngas Syngas consists of hydrogen and carbon monoxide (and lesser amounts of carbon dioxide and other trace gases) under oxygen depleted, high pressure, high-heat and/or steam conditions. The gasifier is essentially a chemical reactor where various complex physical and chemical processes take place. 9
  • 10. Other System Components Boiler o Customized to provide superheated steam o Designed to burn syngas from gasifier o NOx emissions up to 30 ppm o Temperatures up to 450 C are achievable o Efficiency 88 to92% Turbine o Multistage impulse, extraction cum condensing o Designed to produce 5 MW electricity o Working at 450C and 40atm 10
  • 11. Proposed Plant Details SOLAR FIELDTotal number of modules 960Arrangement 3 loops in series & 20 strings in parallelMass flow rate 5 kg/sWorking Fluid Therminol VP-1Energy contribution from solar field annually at 1000W/m2 18% TURBINEInlet temperature 450 CTotal thermal energy input for the steam turbine 16.67MWNet electric output of the steam turbine 5MW BIOMASS GASIFIERArrangement 3 numbers in parallelModel Ankur Scientific gasifiers ( WBG-2200)Rated gas flow 4,950 Nm3/hrAverage gas calorific value 1100 Kcal/Nm3Rated thermal output 54,45,000 Kcal/hrMaximum biomass consumption Maximum 1980 Kg/hrMoisture content < 20% (Wet Basis) 11
  • 12. Proposed Plant Operation• When Solar Radiation is available – Solar field heats the working fluid (Therminol) from an input temperature of 1200C to 250oC at 40atm saturated vapour. – The working fluid passes through the biomass boiler to reach the steam turbine at input temperature of 4500C 40atm super heated. – One gasifier only runs at 50-70% capacity and the others get turned off.• When Solar Radiation is not available – Therminol bypasses the solar field and is completely heated in the boiler. – All gasifiers run at full capacity to provide required thermal input of 16.67MW/H. 12
  • 13. Expected Plant Performance Expected energy output o Solar - 67,01,400 kWh (18%) o Biomass - 3,05,28,600 kWh (82%) o Total - 3,72,30,000 kWh Annual Energy contribution from solar - 18% @ DNI: 5.4 Daily Biomass consumption - 116 tonnes Annual Biomass consumption - 36,000 tonnes Total biomass savings (approx) - 7500 tonnes a year• Assumptions:-• Plant uptime : 85%• Boiler efficiency : 90% 13
  • 14. TABLE OF CONTENTS Technology Overview Financial Overview Conclusions 14
  • 15. Important Assumptions ASSUMPTIONSPlant Capacity 5 MWPlant Load Factor 85%Energy Generation in Units 37.23 million unitsAuxiliary Consumption 8%Tariff INR 7.50Biomass Consumption 36,000 tonnes per annumBiomass Cost including transportation INR 2,500 per tonneTotal Project Cost including IDC INR 933.6 millionDebt Equity Ratio 70:30Term Loan interest rate 13%Working Capital interest rate 13%Repayment of debt 1 year moratorium + 9 yearsO&M cost INR 2 million / MWEscalation of Biomass rate 5% per annumEscalation of O&M cost 5% per annumPower Tariff Increase 2% per year 15
  • 16. Plant and Machinery Break Up PLANT COST BREAK UPLAND AND SITE DEVELOPMENT 49.50PLANT AND MACHINERY 699.1Boiler & Auxiliary 10.0Turbine & Auxiliary 55.0Solar Field 510.0Gasifier 41.4Civil Works For Boiler, Turbine & Other Equipment 30.0Power Evacuation & Distribution System 20.0Fuel Handling System 10.0Others 22.7EPC CHARGES 45.0PREOPERATIVE EXPENSES INCLUDING IDC ANDCONTINGENCIES 117.22TOTAL PLANT COST INCLUDING WC MARGIN 933.6 All figures in INR million 16
  • 17. Important Ratios IMPORTANT RATIOSDSCR- Average 1.50- Minimum 1.01- Maximum 21.39IRR 14.67%Equity IRR 17.43%Payback Period 7th year from COD LEVELIZED COST OF ELECTRICITYAssumed Return on Equity 15%Levelized Variable Cost INR 3.49Levelized Fixed Cost INR 4.41LEVELIZED COST OF ELECTRICITY INR 7.90 PER UNIT 17
  • 18. TABLE OF CONTENTS Technology Overview Financial Overview Conclusions 18
  • 19. Conclusions• Proposed solar biomass hybrid solution - – Reduces the usage of biomass. – Increases the capacity utilization factor of the plant. – Lowers the carbon footprint by not burning the biomass. – Suitable for distributed power generation in any location. – Efficient in solar thermal energy conversion. 19
  • 20. THANK YOU! 20