Impacts of solar multiple on the performance of direct steam generation solar power tower plant with integrated thermal storage

doi:10.1007/s11708-017-0503-5

Front. Energy

2017, Vol. 11

Issue (4) : 461-471 https://doi.org/10.1007/s11708-017-0503-5

RESEARCH ARTICLE

Impacts of solar multiple on the performance of direct steam generation solar power tower plant with integrated thermal storage

Yan LUO¹, Xiaoze DU², Lijun YANG², Chao XU²(

), Muhammad AMJAD³

¹. School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206; School of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
². School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China
³. School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JT, UK; School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China

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Abstract

Solar multiple (SM) and thermal storage capacity are two key design parameters for revealing the performance of direct steam generation (DSG) solar power tower plant. In the case of settled land area, SM and thermal storage capacity can be optimized to obtain the minimum levelized cost of electricity (LCOE) by adjusting the power generation output. Taking the dual-receiver DSG solar power tower plant with a given size of solar field equivalent electricity of 100 MW_e in Sevilla as a reference case, the minimum LCOE is 21.77 ￠/kWh_e with an SM of 1.7 and a thermal storage capacity of 3 h. Besides Sevilla, two other sites are also introduced to discuss the influence of annual DNI. When compared with the case of Sevilla, the minimum LCOE and optimal SM of the San Jose site change just slightly, while the minimum LCOE of the Bishop site decreases by 32.8% and the optimal SM is reduced to 1.3. The influence of the size of solar field equivalent electricity is studied as well. The minimum LCOE decreases with the size of solar field, while the optimal SM and thermal storage capacity still remain unchanged. In addition, the sensitivity of different investment in sub-system is investigated. In terms of optimal SM and thermal storage capacity, they can decrease with the cost of thermal storage system but increase with the cost of power generation unit.

Keywords direct steam generation solar power tower solar multiple thermal energy storage capacity levelized cost of electricity (LCOE)

Corresponding Author(s): Chao XU

Just Accepted Date: 13 September 2017 Online First Date: 31 October 2017 Issue Date: 14 December 2017

Cite this article:

Yan LUO,Xiaoze DU,Lijun YANG, et al. Impacts of solar multiple on the performance of direct steam generation solar power tower plant with integrated thermal storage[J]. Front. Energy, 2017, 11(4): 461-471.

URL:

https://academic.hep.com.cn/fie/EN/10.1007/s11708-017-0503-5
https://academic.hep.com.cn/fie/EN/Y2017/V11/I4/461

Tab.1 Meteorologicaldata and design conditions for the site of Sevilla

Fig.1 Schematic diagram of theproposed dual-receiver with solar field

Fig.2 Solar field layout of thedual-receiver

Fig.3 Scheme of DSG solar powertower plant

Fig.4 Operating modes of the solarpower tower plant

Item	Cost model
Investment	Specific investment in land/($·m⁻²)	1.25 [27]
	Specific investment in improvement/($·m⁻²)	20 [27]
	Specific investment in solar field/($·m⁻²)	200 [27]
	Investment in dual-receiver/$	$66.46 × (A R 1440) 0.7$ [21]
	Investment in tower/$	$29.15 × (H 203) 0.0113$ [27]
	Specific investment in thermal storage/($·kWh⁻²_th)	43 [11]
	Specific investment in power generationunit/($·kWh⁻²_e)	1000 [26]
	Indirect cost for power generationunit/%	25 [26]
Operation and maintenance	O&M equipment cost percentageof investment per year/%	1 [18]

Tab.2 Cost models usedfor the economic analysis of the DSG solar power tower

Fig.5 Efficiency matrix of thesolar field

Fig.6 Efficiency matrix of thedual-receiver

Fig.7 Daily performance of DSGsolar power tower for June 19–23 (Electricity power and dual-receiveroutlet power are plotted on the left y-axis, thermal energy stored in the tank is plotted on the right y-axis.)

Fig.8 Variation of annual thermalenergy discard factor with SM and thermal storage capacity

Fig.9 Variation of annual electricityproduction with SM and thermal storage capacity

Fig.10 Variation of annual capacityfactor with SM and thermal storage capacity

Fig.11 Variation of LCOE with SMand thermal storage capacity

Tab.3 Meteorologicaldata for other sites

Tab.4 Minimum LCOE andrelated optimal parameters for different sites

Tab.5 Minimum LCOE andrelated optimal parameters for different sizes of solar field equivalentelectricity

Fig.12 Sensitivity analysis of investment

Tab.6 Variation of optimalparameters with investment in thermal storage system and power generationunit

A
H	Enthalpy, kJ/kg
H	Tower height, m
m	Mass flow rate, kg/s
P	Pressure, Pa
Q	Collected solar energy, MW
T	Temperature, °C
V	Wind speed, m/s
W	Mechanical power exported from theturbine, W
Greek symbols
$η$	Efficiency
Subscript
0	Rated condition
1	Inlet
2	Outlet
c	Storage charge
d	Storage discharge
g	Generator
inc	Incident solar energy
o	Ambient
p	Pump
R	Receiver
T	Turbine
tes	Thermal energy storage system

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