Unit comprehensive energy consumption and power consumption limits for calcium carbide, along with calculation methods

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ICS27.010 F10 DB33 Published on 2007-10-23; Version 1.1.1.1 implemented on 2008-01-01. Zhejiang Provincial Local Standard DB33/665—2007: Quotas and calculation methods for comprehensive energy consumption and electricity consumption per unit of calcium carbide products. Issued by the Zhejiang Provincial Quality and Technical Supervision Bureau. Preface: Chapter 4 of this standard contains mandatory provisions. Appendix A of this standard is an informational appendix. This standard was proposed by the Zhejiang Provincial Economic and Trade Commission. This standard is under the jurisdiction of the Zhejiang Energy Standardization Technical Committee. Drafting units of this standard: Zhejiang Energy Conservation Association and Zhejiang Juhua Calcium Carbide Co., Ltd. Main drafters of this standard: Yu Xuchun, Wu Xuehong, Gu Zhengqiang, Shen Jianping, Jin Huiping, Yao Zhiping. Limits and calculation methods for the comprehensive energy consumption and electricity consumption per unit of calcium carbide 1 Scope This standard specifies the requirements and calculation methods for the comprehensive energy consumption and electricity consumption per unit of calcium carbide. This standard applies to the calculation, control, and evaluation of energy consumption in calcium carbide production enterprises. 2 Normative reference documents The provisions in the following documents become provisions of this standard through reference to it. For any referenced document dated, all subsequent amendment sheets (excluding corrections) or revised versions shall not be applicable to this standard; however, parties reaching an agreement under this standard are encouraged to consider whether the latest versions of such documents can be used. For reference documents without a date, the latest version applies to this standard. GB 10665—2004 Calcium carbide (calcium carbide electrode); HG 29802 Methods for calculating energy consumption and savings in calcium carbide products. 3 Terms and definitions: The following terms and definitions apply to this standard. 3.1 Comprehensive energy consumption of calcium carbide products: The comprehensive energy consumption of calcium carbide during the reporting period refers to the total amount of energy used in the production of calcium carbide products. It includes the energy consumed and lost in the production system, auxiliary production systems, and associated production systems, as well as the energy used as raw materials and inputs. It does not include energy spent on domestic purposes, infrastructure construction, technological upgrades, or energy exported outside the facility. 3.2 Comprehensive energy consumption per unit of calcium carbide: This refers to the comprehensive energy consumption expressed in terms of unit standard output, that is, the energy consumed directly per unit of standard calcium carbide produced, as well as the energy consumption and losses associated with the auxiliary and supporting production systems involved in the production of this product. 3.3 Electricity consumption per unit of calcium carbide produced: This refers to the electricity used in the production process to manufacture calcium carbide, expressed per unit of standard calcium carbide output. It includes electricity used for heating the furnace, but does not include electricity for power generation, lighting, or environmental protection equipment. 3.4 Calcium Carbide Production Area: The entire production process of calcium carbide products, starting from the input of raw materials such as coke and energy along with the relevant metering processes, up to the metering and storage of the finished calcium carbide products. 4 Comprehensive energy consumption and electric furnace power consumption limits 4.1 The comprehensive energy consumption per unit of calcium carbide (on a scalar basis) and the limits for electric furnace power consumption shall meet the requirements specified in Table 1. Table 1: Limit values for the comprehensive energy consumption per unit of calcium carbide (scalar value) and the power consumption of electric furnaces. Limit values: Comprehensive energy consumption per unit of calcium carbide/ton = ≤1.15 standard coal tons/ton; Power consumption per unit of calcium carbide/kilowatt-hour/ton = ≤3350. 5 Calculation methods: 5.1 Scope of energy consumption statistics and principles for determining the conversion factors to standard coal. 5.1.1 Scope of energy consumption statistics: The entire production process of calcium carbide, starting from raw materials and energy sources such as coke, up to the point at which the finished calcium carbide product is measured and stored. It consists of energy consumption from three parts: the process units of the production system, the auxiliary production system, and the facilities of the supporting production system. 5.1.2 The energy exported outward should be deducted from the total energy consumption. The sealed furnace gas exported outside the calcium carbide production area and the recovered waste heat are counted as energy exported outward. The extracted coke (coal) powder, as well as the lime produced for internal use, are also counted as energy exported; their calorific value is determined based on the measured lower heating value. 5.1.3 The comprehensive energy consumption of calcium carbide products includes the following items: a) Electricity consumption includes power used for electric furnaces, machinery, lighting, and environmental protection equipment ； b) Carbon raw materials include coke, petroleum coke, anthracite, electrode paste, and other carbon reducing agents. The quantity takes the first process after entry into production as the measurement point ； c) Drying coke consumes fuel; its calorific value and calculation basis are the same as those above. When drying coke using the waste heat generated from calcium carbide production, this waste heat is not counted as fuel consumption ； d) Various energy-consuming fluids used in the calcium carbide production system: including cooling water, oxygen, nitrogen, and compressed air, whose calorific value is calculated based on the specified equivalent calorific value ； e) Energy consumed by auxiliary production systems: The energy used in various auxiliary processes (including those within the calcium carbide production area, from the arrival of lime to the storage of the finished calcium carbide product) (energy already calculated in the previous item shall not be counted again) ； f) Energy consumed by auxiliary production systems: includes the energy used in maintenance areas, laboratories, control rooms, warehouses, and workshop offices within the calcium carbide production site. 5.1.4 The energy consumption and losses of auxiliary and auxiliary production systems shall be fully allocated to the products; the allocation of such energy consumption and losses to the products is done on a proportion basis relative to their output value. 5.1.5 Since the calorific values of various energy sources differ, they should be converted to standard coal as a unified unit of calculation. For various types of energy purchased by enterprises, their calorific value is based on the lower heating value measured in that region or by the enterprise during the reporting period. In the absence of actual measurement conditions, the reference coefficients for converting various energy sources to standard coal in Appendix A shall be used. 5.1.6 The equivalent calorific value of electricity purchased by enterprises is 3601 kJ/kWh. 5.2 Calculation Method 5.2.1 The calculation of the comprehensive energy consumption for calcium carbide products shall comply with the provisions in HG 29802. 5.2.2 Comprehensive energy consumption of calcium carbide products (Ecz), expressed in tons of standard coal, is calculated using equation (1): Ecz = – ………………(1) Where: eic — the physical quantity of a certain type of energy consumed in the production of calcium carbide products ； 　　　 — Auxiliary energy, supplementary energy consumed in calcium carbide production, and energy losses ； eif — a physical quantity of a certain energy source emitted during the production process of calcium carbide products ； —Coefficient for converting a certain type of energy to standard coal ； n—number of energy types. 5.2.3 Comprehensive energy consumption per unit of product (scalar), expressed in tons of standard coal per ton, is calculated using equation (2): = ………………………………………(2) Where: — The standard quantity of calcium carbide product (converted to a scalar value of 300 L/kg); the unit is tons. The standard value for calcium carbide products is determined by converting the total gas generation volume of the actual calcium carbide products to 300 L/kg. The gas evolution rate of calcium carbide products is determined in accordance with the provisions of 4.1 in GB 10665-2004. 5.2.4 Power consumption per unit of product (scalar) for electric furnaces (), expressed in kilowatt-hours per ton, is calculated using equation (3): = ………………………………………(3) Where: — is the electricity consumed during the production of calcium carbide products, including power used for heating the furnace, but excluding power for machinery, lighting, and environmental protection equipment, measured in kilowatt-hours. Appendix A (Informational Appendix) – Reference Factors for Converting Various Energy Sources and Energy-Consuming Substances into Standard Coal

Table A.1: Reference Factors for Converting Various Energy Sources and Energy-Consuming Substances into Standard Coal

| Energy Source | Average Lower Heating Value | Factor for Converting to Standard Coal |
|----------------|---------------------------|----------------------------------------|
| Raw coal | 0.7143 kg standard coal/kg | |
| Coke, petroleum coke, other carbon reducing agents | 28,470 kJ/kg | 0.9714 kg standard coal/kg |
| Electrode paste | 25,121 kJ/kg | 0.8571 kg standard coal/kg |
| Crude oil, fuel oil | 41,868 kJ/kg | 1.4286 kg standard coal/kg |
| Gasoline, kerosene | 43,124 kJ/kg | 1.4714 kg standard coal/kg |
| Diesel | 42,705 kJ/kg | 1.4571 kg standard coal/kg |
| Gas from closed calcium carbide furnaces | 11,168 kJ/kg | 0.3798 kg standard coal/m³ |
| Thermal energy (equivalent) | – | 0.03412 kg standard coal/MJ (0.14286 kg standard coal/1,000 kcal) |
| Electrical energy (equivalent) | 3,600 kJ/kWh | 0.1229 kg standard coal/kWh |
| Lime | 5,225.13 MJ/ton | 0.179 tons standard coal/ton |
| Steam (low pressure) | 3,765.60 MJ/ton | 0.129 tons standard coal/ton |
| Purchased water | 2.51 MJ/ton | 0.086 kg standard coal/ton |
| Soft water | 14.23 MJ/ton | 0.486 kg standard coal/ton |
| Deoxygenated water | 28.45 MJ/ton | 0.971 kg standard coal/ton |
| Compressed air | 1.17 MJ/m³ | 0.040 kg standard coal/m³ |
| Blast air | 0.88 MJ/m³ | 0.030 kg standard coal/m³ |
| Oxygen | 11.72 MJ/m³ | 0.400 kg standard coal/m³ |
| Nitrogen | 19.66 MJ/m³ | 0.671 kg standard coal/m³ |
| Carbon dioxide gas | 6.28 MJ/m³ | 0.214 kg standard coal/m³ |