Research on in-situ remote offshore wind-power consumption based on ice-slurry cold storage

doi:10.19799/j.cnki.2095-4239.2023.0536

Abstract

Abstract:

Considering the high cost and limitations of long-distance offshore wind-power transmission in far-reaching sea, a technical route is proposed herein using ice slurry as a cold storage medium for wind-power elimination in remote offshore spots. Considering a single wind-driven generator in the South China Sea as the research object, performance and economic evaluation models were developed to analyze the cycle coefficient of performance, ice-making speed, unit power consumption, annual cost, and unit ice-making cost. The generator unit was also compared with ice-making machines in shipboard scenarios. The results showed that in the case of water extraction from below the sea surface and replenishing freshwater for ice making, the ice-making speed of the ice-slurry generator unit based on wind power reached 57.18 t/h and the unit power consumption was 39.47 kWh/t. Compared with seawater flake ice-making machines operating at the same power, the ice-making speed was increased by 80.4% and the unit power consumption was reduced by 51.1%. The unit exhibited high production capacity and energy efficiency; the ratio of annual cooling capacity loss from the ice storage tank did not exceed 2.7% of the refrigeration capacity, and it did not exceed 5% when all cooling capacity losses were combined. Moreover, it remained almost unaffected by changes in the seawater flow velocity. The insulation capability of the unit was also excellent. Considering the cooling capacity loss, the annual ice production of the unit reached 951700 tons, which can refrigerate at least 475850 tons of seafood and supply ice to more than 1100 1000-ton fishing ships, indicating that it could meet large-scale ice requirements. The unit's annual cost was 17587000 CNY, and the cost of producing ice slurry was as low as 36.96 CNY per ton, which was 47.3% less than that of a seawater flake ice-making machine in a shipboard scenario. These findings indicate the strong competitiveness and good economic feasibility of the unit.

Key words: wind power consumption, ice making, cold storage, ice slurry, economic analysis

CLC Number:

TK 02

Fuchao LI, Mingbiao CHEN, Qun DU, Yongzhen CHEN, Wenji SONG, Wenye LIN, Ziping FENG. Research on in-situ remote offshore wind-power consumption based on ice-slurry cold storage[J]. Energy Storage Science and Technology, 2023, 12(12): 3730-3739.

Figures/Tables 11

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方案	制冰速度/(t/h)	每吨冰浆耗电量/(kWh/t)
1	19.06	282.14
2	26.55	253.49
3	22.15	91.82
4	28.45	70.75
5	42.05	51.76
6	57.18	39.47

方案	制冰速度/(t/h)	每吨冰耗电量/(kWh/t)
A	10.64	240.22
B	30.43	84.00
C	31.70	80.64
6	57.18	39.47

方案	投资成本 /万元	运营成本 /万元	费用年值 /万元	制取每吨冰浆费用 /(元/吨)
1	2160.49	2778.85	3115.50	196.44
2	2397.25	3478.00	3851.54	174.25
3	2201.23	1039.12	1382.12	75.04
4	2412.47	1042.45	1418.37	59.95
5	2196.81	1282.53	1624.84	46.42
6	2426.05	1380.67	1758.70	36.96

方案	投资成本/万元	运营成本/万元	费用年值/万元	制取每吨冰费用/(元/吨)
A (小型制冰机)	129.82	1882.98	1903.21	204.19
B (片冰机)	377.84	1883.94	1942.82	72.88
C (海水片冰机)	396.36	1884.15	1945.91	70.07
6	2426.05	1380.67	1758.70	36.96

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