A compressed air energy storage system driving reverse osmosis desalination system

doi:10.19799/j.cnki.2095-4239.2021.0231

Abstract

Abstract:

To solve the problems of high-energy consumption and the high cost of traditional reverse osmosis (RO) desalination systems, an innovative hybrid adiabatic compressed air energy storage system (ACAES) and RO desalination was proposed. The system was based on the improvement of adiabatic compressed air energy storage on the fluctuation of grid load and its output characteristics. The mathematical model of each part of the hybrid system was established, and the dynamic simulation of the system under different design conditions was carried out using 20 s time steps. The classic Runge-Kutta algorithm was used to solve the problem. Then, the effect of the storage pressure range and seasonal variation on the system's performance was analyzed. Meanwhile, the investment cost was estimated, and the economy of the hybrid system was evaluated under different design conditions. The results showed that, in all of the simulated working conditions, when the end pressure of discharge (EPD) changed within 3～7 MPa, regardless of whether the end pressure of charge (EPC) was within 8～12 MPa, the optimal value of the EPD was 5 MPa; this rendered the specific energy consumption (SEC) of freshwater production by the system the lowest. SEC in high summer temperatures could be reduced by approximately 30% compared to low temperatures in winter. In all simulated working conditions, when the EPC was 12 MPa and the EPD was 5 MPa, the SEC had a minimum value of 1.72 USD/m³. Compared with a traditional RO desalination system, the unit price for producing freshwater using this hybrid system could be reduced by a maximum of 4.4%, thereby achieving better economic performance. This study helps promote the application of A-CAES in the field of RO desalination and provides a theoretical basis for the construction of such a power plant.

Key words: ACAES, RO desalination, SEC of fresh water production, fresh water production, unit price of freshwater

CLC Number:

TK 02

Aohui ZHENG, Zheng CAO, Yujie XU, Haisheng CHEN, Jianqiang DENG. A compressed air energy storage system driving reverse osmosis desalination system[J]. Energy Storage Science and Technology, 2021, 10(5): 1597-1606.

Figures/Tables 14

Fig. 1

Table 1

Investment cost (IC) calculation of components"

设备	投资成本/USD
压缩机	$I C c = 71.1 × m a 0.92 - η c × π c × l n π c$
膨胀机	$I C e = 6000 × W e / 1000 0.7$
换热器	$I C h x = 130 × A h x / 0.093 0.78$
储罐	$I C p = 4042 × V s t 0.506$
反渗透海水淡化模块	$I C R O = 8000 / 6.4 × Q i n$

Table 1

Table 2

Fig. 2

Table 3

Table 4

Fig. 3

Fig. 4

Fig. 5

Fig. 6

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Fig. 9

Fig. 10

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参数	数值
环境压力/kPa	101
压缩机额定气体流量/(kg·s^-1)	10
压缩机额定效率	85%
压缩机额定进气温度/℃	25
膨胀机额定气体流量/(kg·s^-1)	10
膨胀机额定效率	88%
膨胀机额定进气温度/℃	25
冷却水流量/(kg·s^-1)	5
预热水流量/(kg·s^-1)	5

压缩机组背压/MPa	额定压比	额定功率/MW
8	3.056	1.460
9	3.144	1.504
10	3.225	1.543
11	3.301	1.580
12	3.371	1.670

膨胀机组进气压力/MPa	额定膨胀比	额定功率/MW
3	1.895	0.547
4	2.015	0.597
5	2.112	0.635
6	2.195	0.665
7	2.267	0.691

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