The document discusses a proposed hybrid solar thermal and biomass power plant. The plant would use an auxiliary biomass-fueled boiler to provide steam to drive a turbine when solar radiation is insufficient. This allows for stable, continuous electricity generation from completely renewable sources. The hybrid design is estimated to cost less than separate solar thermal and biomass plants alone and ensures full utilization of both renewable resources.

1. BIOMASS SUPPORTED
SOLAR THERMAL HYBRID
POWER PLANT
1

2. INDEX
Introduction
Working principle of STPP
Proposed biomass supported STPP
Advantages
Conclusion 2

3. INTRODUCTION
Use of non-renewable energy cause environmental
pollution and also they gets depleted
Pollution free, freely available renewable sources are
best alternative
Solar power plants are widely used but its main
problem is variability
Biomass plants are also used but its fuel availability in
large amount is difficult
3

4. INTRODUCTION contd..
To overcome the disadvantages of both power plants
they are combined
By shared use of some of the equipments effective
cost is less than simple addition
Effective operating hours and therefore overall energy
generation is higher
Hence this can be considered as technology for future
4

5. 
Need of solar thermal power plant is
increasing due to increased fuel cost and
environmental pollution

Working similar to conventional thermal
power plant

Steam is generated through solar thermal
energy instead of fossil fuel
WORKING PRINCIPLE OF SOLAR
THERMAL POWER PLANT
5

6. METHODOLOGIES USED
Parabolic Trough Collector System
Parabolic Dish Focus System
Central Receiver System
6

7. Diagram of parabolic trough
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8. WORKING . .
Most cost effective and reliable among the three
 It is constructed as a long parabolic trough-
shaped mirror, generally made of polished metal
Heat transfer fluid (usually oil) runs through the tube
to absorb the concentrated sunlight.
Heat from this HTF is used to produce super heated
high pressure steam
8

9. Diagram of parabolic dish STPP
Tracks the sun by rotating
about two axes and rays are
brought to a point focus
Receiver is placed at the focus
Working fluid in the receiver
gets heated
Using this heat steam is
produced
Steam drives a prime mover to
9

10. Central Receiver System
10

11. WORKING . .
Solar radiation reflected from arrays of large mirrors
which are called heliostats is concentrated on a
receiver situated at the top of a supporting tower
A molten salt is used as working fluid and medium of
thermal storage
11

12. Characteristics of STPP
Collects thermal energy from
sunrise
When obtained energy is
insufficient stored energy is used
Hence constant electrical
output is obtained
Stored energy will be depleted
sooner and thereafter no energy
production
12

13. PROPOSED BIOMASS SUPPORTED STPP FOR
STABLE AND CONTINUOUS OPERATION
Large amount of budget will be required for building
of large storage system
Biomass supported plant can contribute to generate
electrical energy continuously
An auxiliary boiler is used to heat water whose fuel is
provided from the biomass plant.
It maintain rated parameters of STHPP.
Hence generate electrical energy stably &
continuously. 13

14. Solar thermal power plant with an
auxiliary boiler
In addition an auxiliary
boiler is placed
Fuel to boiler is provided
from the biomass plant
Steam from the boiler is
given to the turbine in case of
insufficient solar radiation
14

15. Characteristics of STHPP with
auxiliary boiler
Storage energy of STHPP
remain almost constant
throughout the day
So the electrical energy
produced is stable and
continuous
15

16. Thermal energy is relatively easier and less costly to
store compared to electrical energy
Sensible heat storage is most commonly used heat
storage
Thermal storage system of STHPP consists of two
distinct tanks
CONTRIBUTION OF THERMAL
ENERGY STORAGE SYSTEM
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17. CONTD . .
One contains working fluid leaving the solar reflector
and other contains cooled working fluids leaving the
steam generator
Tanks must be of same size, in case of unavoidable
disturbances entire contents should be stored in one
tank
Thermal energy is passed to storage if the
temperature of heat source is higher than heat loads
and vice versa
17

18. BIOMASS FOR STPP
Obtained from biological materials such as plants, trees,
waste, sewage gas, etc.
The effectiveness of power generation requires availability
of biological materials and their transportation.
Combustion gases from the auxiliary boiler are conveyed
to fuel gas cleaning system and cleaned gases are released
to atmosphere.
We must integrate the correct sources of energy for
optimal power supply to a region.
It depends on transportation, transmission and
distribution lines. 18

19. ADVANTAGE OF BIOMASS
SUPPORTED STHPP
Redundant energy is stored during sunny days
When the parameters of steam cannot reach rated
value during insufficient solar radiation, then
biomass plant starts to operate
Thus mixed steam reaches to rated value at exit of
receiver
Ensures 100% use of renewable sources to generate
electricity
Reduce pollution and increase the efficiency of 19

20. FURTHER RESEARCH FOR
STHPP SYSTEM
To minimize the cost of large solar thermal energy
storage system
The operation of auxiliary boiler fed from biomass fuel
should be more optimized and automatic for stable
and reliable operation
20

21. Used to drive Stirling engine to generate electricity
A Stirling engine is a heat engine operating by cyclic
compression and expansion of the working fluid, at
different temperature levels such that there is net
conversion of heat energy to mechanical
work( Stirling engine)
WORKING…
21

22. Alpha type Stirling engine. There are two cylinders. The expansion
cylinder (red) is maintained at a high temperature while the compression
cylinder (blue) is cooled. The passage between the two cylinders contains
the regenerator
Alpha type Stirling engine
22

23. ABSTRACT
Non-renewable resources are in a edge of depletion.
Energy efficient renewable sources are needed for
our future.
Biomass supported STHPP is a solution.
Energy generation totally from renewable sources. 23

24. Sources
Estimated
cost/KW (in USD) Estimated combined cost/KW
(in USD )
Solar thermal plant 3,149
5,018
Biomass plant 1,869
ESTIMATED COST OF PROPOSED BIOMASS
SUPPORTED SOLAR THERMAL HYBRID POWER PLANT
24

25. CONCLUSION
Ensure to use 100% renewable sources
Stable and continuous mode of operation
The storage system of STHPP contributes to save
biomass fuel that will increase the overall efficiency of
the plant
This plant can be considered as most important
modes to use solar thermal and biomass power in
future
25

26. The world’s first plant combining biomass
and solar thermal energy in Catalonia
It can generate 25 MW of
power enough to supply 75000
houses
 It consist of almost 2,688
solar panels
Using this renewable energy
plant will prevent 24,500 tones
of CO2 from being released into
the atmosphere. 26

27. REFERENCE
D. Mills, "Advances in solar thermal electricity
technology”
Z. Y. Ming and W. Jun, "Trough system and tower
system”
G. Celli, et al., "Optimal location of biogas and
biomass
generation plants" 27

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