GB 21346-2022The norm of energy consumption per unit product of electrolytic aluminum and alumina (English PDF)

6.1 Statistical Scope of Energy Consumption

6.1.1 The statistics of the AC power consumption of aluminum liquid include: the AC power consumed by the process of the electrolysis workshop belonging to the production system; the AC power consumed by the stop-slot conductive bus bar and the short-circuit junction in the electrolysis workshop, the AC power consumed during the roasting and start-up of the electrolytic cell, the AC power consumed by the external compensation bus and the AC power consumed by the corridor bus needs to be deducted in calculation.

6.1.2 The statistics of the comprehensive AC power consumption of aluminum liquid include: the AC power and line loss consumed by the electrolysis workshop belonging to the production system, the power supply workshop (rectification station), power workshop (air compressor station), and purification workshop (mainly in charge of flue gas purification, electrolytic desulfurization and material transportation) belonging to the auxiliary production system, and workshop and the management department for lighting, heating, cooling and bathing, etc. belonging to the affiliated production system; the AC power consumed by electrolytic desulfurization in the electrolytic series of flue gas purification needs to be deducted in calculation.

6.1.3 The statistics of the comprehensive AC power consumption of aluminum ingots include: the AC power and line loss consumed by the electrolysis workshop and casting workshop belonging to the production system, the power supply workshop, power workshop and purification workshop belonging to the auxiliary production system, and workshop and the management department for lighting, heating, cooling and bathing, etc. belonging to the affiliated production system; the AC power consumed by electrolytic desulfurization in the electrolytic series of flue gas purification needs to be deducted in calculation.

6.1.4 The statistics of the comprehensive unit consumption of aluminum ingots include: the AC power and various other energy sources consumed by the electrolysis workshop and casting workshop belonging to the production system, the power supply workshop, power workshop and purification workshop belonging to the auxiliary production system, and workshop and the management department for lighting, heating, cooling and bathing, etc. belonging to the affiliated production system.

6.1.5 The calculation of energy consumption indicators of electrolytic aluminum products only includes the output and energy consumption of aluminum ingots and electrolytic aluminum liquid for re-melting, and does not include the output and energy consumption of multi-variety requirements of GB/T 1196 or the contract), expressed in (t).

6.2.1.2 The AC power consumed by the stop-slot conductive bus bar and the short-circuit junction shall be calculated in accordance with Formula (2): Where, Qtj

---the AC power consumed by the voltage drop of the stop-slot conductive bus bar and the short-circuit junction in the electrolytic series during the reporting period, expressed in (kW h); Qj

---the AC power consumed by the electrolytic series of process during the reporting period, expressed in (kW h); Nt

---the number of stop-slot days during the reporting period, expressed in (d); Vt

---the measured value of the voltage drop of each stop-slot conductive bus bar and short- circuit junction, expressed in (V); Vx

---the cumulative DC voltage of the electrolytic series during the reporting period, expressed in (V d).

6.2.1.3 The DC power consumption during the roasting and start-up of the electrolytic cell shall be calculated in accordance with Formula (3): Where, Qqj

---the AC power consumed during the roasting and start-up of the electrolytic cell during the reporting period, expressed in (kW h); Qj

---the AC power consumed by the electrolytic series of process during the reporting period, expressed in (kW h); Nq

7.1 Statistical Scope of Energy Consumption

7.1.1 The statistics of the energy consumption of the Bayer process include: the process energy consumption of alumina products by batching workshop, dissolution workshop, sedimentation workshop, decomposition workshop, roasting workshop and evaporation workshop, which belong to the production system, as well as laboratory and water supply workshops, which belong to the auxiliary production system; the energy consumption of the condensed return water with oil in the evaporation and dissolution process needs to be deducted in calculation.

7.1.2 In addition to the workshops included in

7.1.1 described above, the statistics of the comprehensive energy consumption of the Bayer process also include the comprehensive energy consumption of alumina products by gasification furnace, machine maintenance, warehouse and transportation workshops, which belong to the auxiliary production system, as well as the production command system (factory department) and the departments and organizations serving production in the factory area, which belong to the affiliated production system.

7.1.3 The statistics of the energy consumption of other processes include: the process energy consumption of alumina products by batching workshop, clinker sintering workshop, dissolution workshop, sedimentation workshop, decomposition workshop, roasting workshop and evaporation workshop, which belong to the production system, as well as other process energy consumption of alumina products by laboratory and water supply workshops, which belong to the auxiliary production system.

7.1.4 The statistics of the comprehensive energy consumption of other processes include: the comprehensive energy consumption of other processes of alumina products by batching workshop, clinker sintering workshop, dissolution workshop, sedimentation workshop, decomposition workshop, roasting workshop and evaporation workshop, which belong to the production system, laboratory, water supply, thermal power, gasification furnace, machine maintenance, warehouse and transportation workshops, which belong to the auxiliary production system, as well as the production command system (factory department) and the departments and organizations serving production in the factory area, which belong to the affiliated production system.

7.1.5 The energy consumed by the waste heat utilization device is included in the energy consumption. The self-use part of recovered energy is included in the self-use process; the recovered energy for external use or other non-production purposes shall be deducted.

7.1.6 The lower heating value of energy and the energy consumption of energy-consuming working media shall be converted into standard coal in accordance with the actual measured value or the data provided by the supplier. If the actual measured value cannot be obtained, the standard coal conversion coefficient can refer to the data published by the National Bureau of Statistics or the data provided in Appendix A and Appendix B. For self-produced secondary energy, its standard coal conversion coefficient shall be calculated and determined in accordance with the actual input and output.

7.2 Calculation Methods

7.2.1 Physical unit consumption The physical unit consumption includes the consumption during the production of alumina, such as: burnt coal, raw coal, steam, carbon coke, electricity, roasting fuel, pipeline dissolution fuel (natural coal, gas and coal, etc.), new water, circulating water and compressed air, etc.

7.2.2 Water return per unit of steam condensation The water return per unit of steam condensation, which includes condensed return water during the evaporation and dissolution process, shall be calculated in accordance with Formula (9): Where, Dq

---the water return per unit of steam condensation during the reporting period, expressed in (t/t); eq

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