Modeling of similar characteristics of turbo-expander in supercritical CO2 energy storage based on different working fluids

doi:10.19799/j.cnki.2095-4239.2021.0342

Abstract

Abstract:

The study of similar modeling characteristics of turbo-expanders with different working fluids is not only the important technical means and necessary method for the research and development of turbo-expanders with special working fluids but also an effective approach to improve the efficiency of research and development and save cost. In this study, a new modeling method based on rotational speed, inlet total temperature, adiabatic index, and gas constant is proposed. The modeling method is suitable for varying the working fluids of turbo-expanders, and it is numerically confirmed using supercritical CO₂ and air in a turbo-expander. It exhibits high accuracy in modeling the overall performance parameters and has a good modeling effect in predicting the internal flow field (Mach number, velocity distribution). This method is suitable for modeling the work process of supercritical CO₂ energy storage at high temperatures and high pressure using air.

Key words: different working fluids, modeling method, supercritical CO₂ energy storage, turbo-expander, similar characteristics

CLC Number:

TK 14

Yiran LI, Wen LI, Xueyu CHANG, Zhitao ZUO, Hui LI, Haisheng CHEN. Modeling of similar characteristics of turbo-expander in supercritical CO₂ energy storage based on different working fluids[J]. Energy Storage Science and Technology, 2021, 10(5): 1815-1823.

Figures/Tables 13

Fig. 1

Table 1

Main independent parameters affecting turbine stage performance"

类别	参数
特征机械参数	叶轮特征直径D，转速n
特征流动介质的物性参数	绝热指数κ，动力黏度μ，气体常数R
影响流动状态的参数	进口总压 $p 1 $ ，进口总温 $T 1 $ ，出口总压 $p 2 *$ ，质量流量G
研究的特性参数	效率?，功率N

Table 1

Table 2

Similarity modeling criteria"

模化准则名称	表达式
透平级膨胀比	$π 1 = p 1 * p 2 *$
折合流量	$π 2 = G R T 1 * p 1 * D 2$
相对雷诺数	$π 3 = p 1 * D μ R T 1 *$
折合转速	$π 4 = n D R T 1 *$
折合功率	$π 5 = N p 1 * D 2 R T 1 *$
绝热指数	$π 6 = κ$
效率	$π 7 = η$

Table 2

Table 3

Main parameters of radial turbine involved in verification"

参数名称	数值
进口总温 $T 1 *$ /K	477.8
进口总压 $p 1 *$ /kPa	333.7
转速n/(r·min^-1)	19919
膨胀比 $p 1 $ / $p 2 $	4.992
出口静压p₂/kPa	51.63
导叶数/静叶数Z_stator/Z_rotor	36/14

Table 3

Fig. 2

Table 4

Fig. 3

Table 5

Numerical calculation parameters with different working fluids method"

参数/工质	SCO₂	CO₂	空气
进口总压 $p 1 *$ /MPa	18	2.85	2.85
进口总温 $T 1 *$ /K	873.15	373.97	393.14
进口绝热指数κ	1.2228	1.3513	1.4206
气体常数R	188.9232	188.9232	286.7059
转速n/(r·min^-1)	48000	31416	39681

Table 5

Table 6

Fig. 4

Fig. 5

Fig. 6

Fig. 7

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参数	实验结果	数值计算结果	误差
质量流量G/(kg·s^-1)	2.71	2.83	+4.43%
功率N/kW	424.30	443.80	+4.60%
效率?/%	88.50	91.75	+3.25%

参数/工质	SCO₂	CO₂	模化误差/%	空气	模化误差/%
总总等熵效率?_tt/%	94.07	94.80	0.73	94.33	0.26
质量流量G/(kg·s^-1)	22.08	6.29	—	4.95	—
折合流量π₂	560.58	586.88	4.69	583.49	4.09
功率N/kW	2929.57	318.57	—	417.82	—
折合功率π₅	0.45	0.42	-3.02	0.44	-1.41
特性比(U₁/C_s)	0.66	0.70	3.51	0.68	2.17

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Modeling of similar characteristics of turbo-expander in supercritical CO₂ energy storage based on different working fluids

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