T/CPCIF 0005-2017 Solar salt molten salt for energy storage

Scope

Main technical content: It specifies the requirements for solar energy molten salt used for energy storage, test methods, inspection rules, and marking, packaging, transportation, and storage. 4.1 Appearance: White or slightly yellow crystals. 4.2 Solar energy molten salt used for energy storage shall comply with the requirements specified in Tables 1 and 2 after being tested according to the test methods prescribed in this standard. Table 1 Technical requirements for Class I products Item Standard Excellent grade First-grade grade Passed grade Potassium nitrate (KNO3) (dry basis) w/% 40.0 ± 0.5 50.0 ± 0.5 Water content w/% ≤ 0.1 0.2 0.3 Water-insoluble matter w/% ≤ 0.03 0.05 0.06 Chloride (calculated as Cl) w/% ≤ 0.01 0.03 0.05 Sulfate (calculated as SO4) w% ≤ 0.06 0.08 0.10 Carbonate (calculated as CO3) w/% ≤ 0.02 0.03 0.04 Nitrite (calculated as NO2) w% ≤ 0.01 0.02 0.03 Ammonium salt (calculated as NH4) w% ≤ 0.01 0.02 0.03 Calcium (Ca) w/% ≤ 0.001 Magnesium (Mg) w/% ≤ 0.001 Barium (Ba) w/% ≤ 0.001 Iron (Fe) w% ≤ 0.003 Decomposition temperature ℃ ≥ 575 Melting point ℃ 220–250 Viscosity (at 300℃) mPa.s 2.95–3.26 Specific heat capacity (at 300℃) J/(g·K) 1.30–1.50 Density (at 300℃) g/cm3 1.85–1.90 Thermal conductivity (at 300℃) W/(m·K) 0.30–0.50 Table 2 Technical requirements for Class II products Item Standard Excellent grade First-grade grade Passed grade Potassium nitrate (KNO3) (dry basis) w/% 53.0 ± 0.5 55.0 ± 0.5 Water content w/% ≤ 0.1 0.2 0.3 Water-insoluble matter w/% ≤ 0.03 0.05 0.06 Chloride (calculated as Cl) w/% ≤ 0.01 0.03 0.05 Sulfate (calculated as SO4) w% ≤ 0.06 0.08 0.10 Carbonate (calculated as CO3) w/% ≤ 0.02 0.03 0.04 Nitrite (calculated as NO2) w% ≤ 0.01 0.02 0.03 Ammonium salt (calculated as NH4) w% ≤ 0.01

Development Information

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