neha energie

8/13/2019 Neha Energie

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Solar & Biomass Hybrid

5 MW Hybrid Solar Thermal + Biomass Plant

Neha Energie


2/20

Technology Overview

Financial Overview

Conclusions

TABLE OF CONTENTS

2


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Plant Schematic Hybrid

Solar Thermal Biomass Plant

Pump

Steam

TurbineGenerator

Condenser

Heat

Exchanger

Electricity

Parabolic Troughs

Biomass Gasifier

Two-Stage Boiler

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2800 kJ/kg

3306 kJ/kg

498 kJ/kg

1097 kJ/kg

20%

20%

60%

x

xx

x100

200

300

400

600 psia isobar

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.

Plant Operation Hybrid

Solar Thermal Biomass Plan

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Solar & biomass are the only renewable resources that

make sense in most of the parts of India

Solar only approach can utilize either PV or solar

thermalo 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

Why Hybrid Solar + Biomass Plant


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Parabolic trough concentrator

Biomass Gasifier

Boiler (producer gas burner)

Super heated steam turbine

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Major System Components


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Parabolic Trough Concentrator

High efficiency and durable mirror

film technology

Temperatures up to 300oC.

Less thermal losses.

Modular & scalable.

Space frame light weight technology

Ease in construction and tracking.

Medium Temperature Parabolic Trough (MTPT)

Fig: MTPT pilot plant at Florida

( Source: SET Florida)


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MTPT - Technical SpecificationsTECHNICAL DETAILS

Construction Materials Aluminum and Steel

Reflective Surface Reflective Film

Reflectivity 0.94Absorber Material Steel

Selective Surface Cermet

Absorber Envelope Borosilicate Glass

Max Wind Speed tolerance 110 mph

Life Expectancy 20 years

TROUGH GEOMETRY

Module Aperture Width 2.74 m 9 ft

Module Aperture Length 12 m 39.4 ft

Module Aperture Area 32.9 sq. m 354 sq. ft

Focal Length 1.49 m 4.9 ft

Number of modules per Solar Collector Assembly (SCA) 8

Total SCA length 100 m 328 ft

Net Aperture Area 263 sq. m 2830 sq. ft


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Gasifier

Gasification

o Thermo-chemical process converts biomassinto 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.


10/2010

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


11/2011

Proposed Plant DetailsSOLAR FIELD

Total number of modules 960

Arrangement 3 loops in series & 20 strings in parallel

Mass flow rate 5 kg/s

Working Fluid Therminol VP-1

Energy contribution from solar field annually at 1000W/m2 18%

TURBINE

Inlet temperature 450 C

Total thermal energy input for the steam turbine 16.67MW

Net electric output of the steam turbine 5MW

BIOMASS GASIFIER

Arrangement 3 numbers in parallel

Model Ankur Scientific gasifiers ( WBG-2200)

Rated gas flow 4,950 Nm3/hr

Average gas calorific value 1100 Kcal/Nm3

Rated thermal output 54,45,000 Kcal/hr

Maximum biomass consumption Maximum 1980 Kg/hr

Moisture content < 20% (Wet Basis)


12/2012

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.


13/2013

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%


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Technology Overview

Financial Overview

Conclusions

TABLE OF CONTENTS

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15/2015

Important AssumptionsASSUMPTIONS

Plant Capacity 5 MW

Plant Load Factor 85%Energy Generation in Units 37.23 million units

Auxiliary Consumption 8%

Tariff INR 7.50

Biomass Consumption 36,000 tonnes per annum

Biomass Cost including transportation INR 2,500 per tonneTotal Project Cost including IDC INR 933.6 million

Debt Equity Ratio 70:30

Term Loan interest rate 13%

Working Capital interest rate 13%

Repayment of debt 1 year moratorium + 9 yearsO&M cost INR 2 million / MW

Escalation of Biomass rate 5% per annum

Escalation of O&M cost 5% per annum

Power Tariff Increase 2% per year


16/2016

Plant and Machinery Break UpPLANT COST BREAK UP

LAND AND SITE DEVELOPMENT 49.50

PLANT AND MACHINERY 699.1

Boiler & Auxiliary 10.0

Turbine & Auxiliary 55.0

Solar Field 510.0

Gasifier 41.4

Civil Works For Boiler, Turbine & Other Equipment 30.0Power Evacuation & Distribution System 20.0

Fuel Handling System 10.0

Others 22.7

EPC CHARGES 45.0

PREOPERATIVE EXPENSES INCLUDING IDC AND

CONTINGENCIES 117.22

TOTAL PLANT COST INCLUDING WC MARGIN 933.6

All figures in INR million


17/2017

Important RatiosIMPORTANT RATIOS

DSCR

- Average 1.50- Minimum 1.01

- Maximum 21.39

IRR 14.67%

Equity IRR 17.43%

Payback Period 7thyear from COD

LEVELIZED COST OF ELECTRICITY

Assumed Return on Equity 15%

Levelized Variable Cost INR 3.49

Levelized Fixed Cost INR 4.41

LEVELIZED COST OF ELECTRICITY INR 7.90 PER UNIT


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Technology Overview

Financial Overview

Conclusions

TABLE OF CONTENTS

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THANK YOU!

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