Optimal design of packed bed cold storage heat exchangers with solid NaClparticles in supercritical compressed air energy storage system

doi:10.19799/j.cnki.2095-4239.2021.0110

Abstract

Abstract:

The cold storage heat exchanger is an important part of a supercritical compressed air energy storage system. In order to explore the influence of design parameters on the processing cost and performance of the cold storage device, a supercritical packed bed cold storage heat exchanger is designed with solid sodium chloride as the cold storage material. According to the required parameters of the system and the constraint equation of the size of the pressure vessel, the 10 MW cold storage heat exchanger is optimized in order to minimize the tank mass and processing costs, minimize the cooling loss, and increase the cold storage efficiency. It is found that with increasing height of the heat exchanger, the tank mass and cost rise gradually. Analyzing the efficiency of the cold storage device under different powers ranging from 0.5MW to 10 MW, we determined that the cold storage efficiency increases gradually from 94.65% to 96.08% with increasing power when the aspect ratio is constant; the cold loss also increases with the power. Finally, in fourteen sets of optimized data, the cold loss of the heat exchanger is relatively low under optimal parameters, with the cold storage efficiency being 96.08%. The processing cost also falls within the acceptable range.

Key words: supercritical compressed-air energy storage(SC-CAES), heat exchanger with cold storage, high pressure packed bed, optimal design

CLC Number:

TK 02

Yuting WU, Gege SONG, Cancan ZHANG, Zhenfeng KOU, Yuanwei LU. Optimal design of packed bed cold storage heat exchangers with solid NaClparticles in supercritical compressed air energy storage system[J]. Energy Storage Science and Technology, 2021, 10(4): 1374-1379.

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节点	流量/kg·s^-1	温度/K	压力/MPa	密度/kg·m^-3	焓/kJ·kg^-1	定压比热容/kJ·(kg·K)^-1	动力黏度×10⁵/Pa·s	导热系数/mW·(m·K)^-1	Pr
R1	42.93	293.15	10	120.26	272.09	1.17	2.05	30.87	0.78
R2	42.82	119.4	10	709.65	-40.78	2.09	6.8	92.97	1.54
S4	34	107.76	7.05	756.93	-65.412	2.04	8.44	106.56	1.61
S5	33.91	291.12	7.04	85.623	275.63	1.13	1.96	28.8	0.77
S1	8.93	102.91	0.8	211.8	-58.7	—	—	—	—
S2	8.91	291.15	0.8	9.60	289.73	1.02	1.83	25.61	0.73

序号	D/mm	H/mm	δ₂/mm	δ₁/mm	h/mm	M罐体质量/kg	成本/万元
1	3300	23205	98.04	94.04	825	184515.49	311.83
2	3350	22499	99	95	837.5	184364.13	311.58
3	3400	21824	101	97	850	184208.18	311.31
4	3450	21177	102.31	98.31	862.5	184047.58	311.04
5	3500	20558	103.74	99.74	875	183882.26	310.76
6	3550	19964	105.16	101.16	887.5	183712.14	310.47
7	3600	19395	106.59	102.59	900	183537.17	310.18
8	3650	18849	108.01	104.01	912.5	183357.26	309.87
9	3700	18325	109.44	105.44	925	183172.36	309.56
10	3750	17821	110.86	106.86	937.5	182982.4	309.24
11	3800	17336	112.29	108.29	950	182787.3	308.91
12	3850	16870	113.71	109.71	962.5	182586.99	308.57
13	3900	16422	115.14	111.14	975	182381.42	308.22
14	3950	15990	116.56	112.56	987.5	182170.52	307.87

序号	H/mm	H/D	δ₂/mm	δ₁/mm	冷量损失/kJ	蓄冷效率/%
1	23205	7.0	98.04	94.04	1530841.62	95.75
2	22499	6.7	99	95	1522865.21	95.77
3	21824	6.4	101	97	1514719.86	95.79
4	21177	6.1	102.31	98.31	1506400.26	95.82
5	20558	5.9	103.74	99.74	1497901.53	95.84
6	19964	5.6	105.16	101.16	1489219.19	95.86
7	19395	5.4	106.59	102.59	1480349.15	95.89
8	18849	5.2	108.01	104.01	1471287.74	95.91
9	18325	5.0	109.44	105.44	1462031. 7	95.94
10	17821	4.8	110.86	106.86	1452578.17	95.97
11	17336	4.6	112.29	108.29	1442924.74	95.99
12	16870	4.4	113.71	109.71	1433069.4	96.02
13	16422	4.2	115.14	111.14	1423010.56	96.05
14	15990	4.0	116.56	112.56	1412747.1	96.08

功率/MW	D/mm	H/mm	长径比β	δ₁/mm	Q_loss/kJ	蓄冷效率/%
0.5	1500	6037	4	42.75	96157.57	94.65
1	1850	7581	4	52.72	173622.78	95.18
2	2350	9159	4	67	319306.65	95.57
3	2650	10728	4	75.52	463717.94	95.71
4	2900	11900	4	82.64	604669.38	95.80
5	3150	12566	4	89.77	739113.82	95.89
6	3350	13422	4	95.46	881753.06	95.92
7	3550	13902	4	101.16	1011478.44	95.99
8	3700	14604	4	105.44	1145009.65	96.02
9	3850	15152	4	109.71	1275302.73	96.06
10	3950	15990	4	112.56	1412747.1	96.08