Presentation on shiraz plant

7/29/2019 Presentation on shiraz plant

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Transient Analysis of the Integrated Shiraz HybridSolar Thermal Power

Plant

Prepared: byIman Niknia, Mahmood Yaghoubi 2


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Table of contents

IntroductionMethodology

ResultsConclusionReferences


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Fig 1- Shiraz Solar ThermalPower Plant (SSTPP)

Introduction


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Initial design of Shiraz Solar Thermal Power

Plant (SSTPP):1. 250 kW power generation2. 48 collectors

3. Three heat exchangers4. Oil cycle5. steam cycle

Fig 2


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1. Environment ( Wind, Temperature and Solar

radiation)2. System defects3. Control philosophy

Parameters affecting the performance of SSTPP (Figure 3):


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0.00000

0.05000

0.10000

0.15000

0.20000

0.25000

0.30000

0.35000

12:00:00 12:25:00 12:50:00 13:15:00 13:40:00 14:05:00 14:30:00 14:55:00

m a s s

f l o w r a

t e k g / s

Mass flow rate of generated steam for 9 August 2009

Experimental data

Time of the day

Fig 3- A sample of instability and fluctuationfrom experimental data


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New design of the SSTPP:1. A new 100 meter collector is designed2. An Auxiliary boiler is integrated3. New control philosophy is needed

For a detailed study of the overall system, afully transient simulation is needed.Such studies have been performed on different

power plants.


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In 2003 Yaghoubi et al performed a steadysimulation, Renewable Energy 28 (2003) .Garcia et al. (2009) performed a transientsimulation for Nevada solar one power plantusing Dinacet , , solar paces, Berlin, Germany 2009 .

Yao et al. (2009) performed a transientsimulation on the pioneer 1MW solar thermalcentral receiver system in China and studied

the system performance under differentworking conditions , Renewable Energy 34 (2009) .


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Using Schwarzbozl STEC code, throughFortran programming, transient simulation is

performed.Different parameters are included.Temperature dependant properties areconsidered.

New collector is integrated.

Methodology


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Evacuated tube of parabolic trough concentratingcollector are modelled based on Eq. (1) Q u=A C [FR ()n It -FR ULT] (1)

Q u = useful energy gain kJ/s I t incident solar radiation kJ/s.m 2 A = area m 2 ()n = normal transmittance absorptanceFR =collector heat removal factor T= temperature differenceK


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A

B

C

Fig 4 - Process flow diagram of the new designed system


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Figure 5- A schematic image of the computer simulation for validation


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Results

Simulation method is validated withexperimental results.

0

100200

300

400

500

600

700

800

900

10:00 10:50 11:40 12:30 13:20 14:10 15:00 15:50

B e a m

r a d

i a t i o n w

/ m ^ 2

Fig 6-Radiation data for 22 th of June 2009


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Validated results

Fig 7b- Collector field outlet oil temperature

400

420

440

460

480

500

520

540

11:00 11:30 12:00 12:30 13:00 13:30 14:00 14:30 15:00 15:30

T e m p e r a t u r e

K

Collector field inlet oil temperature

Experimental measurments Modeling resultsTime

Time400

420

440

460

480

500

520

540

11:00 11:30 12:00 12:30 13:00 13:30 14:00 14:30 15:00 15:30

T e m p e r a t u r e

K

Collector field outlet oil temperature

Experimental measurments Modeling resultsTime

Fig 7a- Collector field inlet oil temperature


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Three different control philosophies are studiedDaneshyar(1978) method is applied for Radiation modeling Solar energy 21.Sum of the Energy of the Generated Steam =hs*dm s (2)h = enthalpy m= mass flow rate kg/s

Oil temperature entering the collector field

Total energy of the Generated Steam

513 K +3.54912E+07 kJ

498 K +5.88074E+07 kJ

483 K +6.42761E+07 kJ

Table 1- Sum of the energy of the Generated Steam

Transient simulation


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Effect of new collector integration

Method of integrating newcollector

No integration Integration withone heatexchanger

Sum of the energyof the generatedsteam

+6.42761E+07 kJ +6.58755E+07 kJ

Table 2-Effect of collector integration method on generated steam

Fig 8-Inlet and outlet steam temperatures

510

530

550

570

10:0010:3011:0011:3012:0012:30 13:0013:3014:0014:3015:0015:30

s t e a m

t e m p e r a t u r e

K

Inlet Outlet

Time


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A parametric study on the capacity of theloops heat exchanger is also performed.

150

170

190

210

230

250

270

0 5 10 15 20 25 30

M

a x i m u m

h e a t

t r a n s

f e r r a

t e k J / s

Overall heat transfer coeficient kJ/sK

Fig 9-Maximum heat transfer rate versus over all heat transfer coefficient


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Conclusion

Two major methods to increase the capacitySSTPP are:

1. Increasing the temperature of the outlet steam

2. Increasing the mass flow rate of the outlet steam

The advantages of addition of an external loop:

1. Easy to install2. Increases the generated power 3. Leaves the main system design intact


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Application of numerical modelling in

1. Design procedure2. Selecting most efficient Control philosophy3. Investigating the designed systems performance

is investigated.


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References[1] M. Yaghoubi, K. Azizian, A. Kenary, Simulation of Shiraz solar power

plant for Optimal assessment, Renewable Energy 28 (2003) 1985 1998[2] P. Garcia, A. Mutuberria, J.Garca-Barberena, M. Sanchez, M.J. Blanco, C.Lasheras, A. Padrs, J. Arraiza, Validation of DINACET computational schemeusing Nevada solar one power plant data, solar paces, Berlin, Germany 2009

[3] Zh. Yao, Zh. Wang, Zh. Lu, Xiudong Wei, Modeling and simulation of the pioneer 1MW solar thermal central receiver system in China,Renewable Energy 34 (2009) 2437 2446[4] P. Schwarzbzl, D. Zentrum, fr Luft und Raumfahrt e.V. (2006), ATRNSYS model library for solar thermal electric components (STEC),Reference manual release 3.0, D-51170 Kln, Germany, November 2006.

[5] J.A.Duffie, W. A. Beckman (1991), Solar engineering of thermal processes , John Wiley & Sons.[6] M. Daneshyar (1978), Solar radiation statistics for Iran, Solar energy21 , pp 345-349.


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Thank you for your attention.

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Presentation on shiraz plant