HG 29801-1991 Calculation method for energy consumption and savings of electrolytic caustic soda products
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975409
Calculation method of energy consumption and savings of electrolytic caustic soda products (HG 29801-91)
Subject content and scope of application
This standard specifies the calculation method of energy consumption and savings of electrolytic caustic soda products. This standard is applicable to the energy consumption assessment of electrolytic caustic soda products, and is also the basis for chemical companies to calculate and count the energy consumption of electrolytic caustic soda products.
2 Reference standards
ZBGO1001 General principles for calculation of energy consumption and savings of chemical companies 3 Energy consumption of electrolytic caustic soda products
3.1 Electrolytic caustic soda products refer to finished caustic soda that meets national standards and is produced by salt electrolysis. The production process of electrolytic caustic soda is divided into three processes: membrane electrolysis, ion membrane electrolysis and mercury electrolysis. The electrolytic caustic soda products are converted into 100% sodium hydroxide to calculate the output, and unqualified products are not counted. All energy consumed by defective products shall be included in the total energy consumption.
3.2 The energy consumption of electrolytic caustic soda products refers to the energy actually consumed in the entire process of product production. That is, the energy consumption of the product production system and the energy consumption and loss of the auxiliary production system and subsidiary production system of the enterprise. It does not include energy for living purposes, nor does it include energy consumption for capital construction and energy exported to the outside. 3.2.1 The energy consumption of electrolytic caustic soda product production system refers to the primary energy, secondary energy and energy-consuming working fluid actually consumed in the caustic soda production area during the reporting period.
3.2.2 The energy consumption and loss of the auxiliary production system and subsidiary production system of enterprises outside the caustic soda production area shall be allocated according to the consumption ratio method.
3.2.3 The waste heat, waste energy and chemical reaction heat generated in the caustic soda production area are recycled and utilized, without counting energy consumption. For the recycling of the equipment outside the boundary area, the actual recycled energy shall be deducted from the energy consumption of this boundary area; if the actual recycled amount is calculated by the unit method, it shall be deducted according to the amount of waste heat resources supplied from outside. The amount of waste heat resources shall be calculated according to Appendix B. However, the by-product hydrogen produced by electrolytic caustic soda production consumed in the caustic soda production boundary area shall be counted as energy consumption.
3.3 The caustic soda production boundary area refers to the entire electrolytic caustic soda product production system from the raw salt, electricity, steam and other raw materials and energy being metered into the process to the finished caustic soda being metered into the warehouse and the associated chlorine and hydrogen being entered into the main pipe. It consists of three parts: process equipment, auxiliary facilities and ancillary facilities. Post-processing systems such as chlorine drying and hydrogen drying are not included. 3.3.1 The process equipment refers to the complete process and equipment composed of the relevant processes from the raw salt or brine being metered into the first-level conveying equipment before entering the salt barrel, the alternating current for electrolysis being metered into the rectifier transformer, to the finished caustic soda being metered and packaged into the warehouse.
The diaphragm electrolysis process equipment includes the processes of brine preparation, rectification, diaphragm electrolysis, evaporation, caustic soda refining, solid caustic soda and finished caustic soda metering and packaging warehouse.
The ion membrane electrolysis process equipment includes the processes of brine degassing, brine secondary refining, rectification, ion membrane electrolysis, dehydrogenation of desalinated brine, evaporation, solid caustic soda and finished caustic soda metering and packaging warehouse. The mercury electrolysis process equipment includes the processes of brine preparation, rectification, mercury electrolysis, dehydrogenation of desalinated brine, caustic soda and finished caustic soda metering and packaging warehouse.
3.3.2 Auxiliary facilities refer to the energy-consuming working fluids and safety and environmental protection devices configured for the process equipment. 3.3.3 Ancillary facilities refer to the facilities such as offices, operation rooms, rest rooms, changing rooms, maintenance halls, machine repairs, intermediate analysis, electrolytic cell management groups, electrolytic cell repairs, membrane adsorption, anode assembly, carbon plate processing, anode repair and nail coating, asbestos wool processing and collection, ion membrane leakage test and repair, etc. specially configured for process units. 3.3.4 Chlorine and hydrogen output boundaries: the nitrogen and hydrogen associated with electrolytic caustic soda production are output boundaries when they enter the main pipe respectively; in the ion membrane and water money electrolysis processes, the oxygen or waste oxygen produced by dehydrogenation of desalinated brine, if not selected for absorption and treatment by auxiliary facilities, is bounded by the exit of the denitrification device.
3.4 The energy consumption of electrolytic caustic soda products must be based on measurement. The AC power for electrolysis shall be based on the AC meter reading entering the rectifier transformer; the steam and other energy and energy-supporting working fluids shall be based on the metered reading entering the caustic soda production boundary area. 3.5 The calorific value of various energy sources must be converted into a unified calculation unit of standard coal. The calorific value of various energy sources shall be based on the calorific value actually measured by the enterprise during the reporting period. If there are no actual measurement conditions, the standard coal conversion coefficients of various energy sources in Record A shall be used. The equivalent calorific value of electricity purchased by the enterprise is 11.84MJ/kW-h (2828kcal/kWH). Self-produced secondary energy and energy-consuming working fluids are calculated based on the equivalent calorific value of the enterprise.
Calculation of comprehensive energy consumption of electrolytic caustic soda products
The comprehensive energy consumption of caustic soda products is divided into: total comprehensive energy consumption, unit product comprehensive energy consumption, and comparable unit product comprehensive energy consumption. The total comprehensive energy consumption of caustic soda products refers to the total energy consumption of 4.1
obtained by comprehensive calculation of various energy sources consumed by electrolytic caustic soda products during the reporting period.
The total comprehensive energy consumption of caustic soda products is calculated according to formula (1): (ei) +
Where: E. ——Total comprehensive energy of electrolytic caustic soda products, standard coal; (ett+ K)
;——A certain energy consumed by electrolytic caustic soda products in the caustic soda production area; eilEnergy and energy loss of auxiliary production systems and subsidiary production systems consumed by electrolytic caustic soda products; K,—Standard coal conversion coefficient of basic energy; n—Number of energy types.
4.2 Comprehensive energy consumption per unit product of caustic soda is the comprehensive energy consumption expressed in unit output, calculated according to formula (2): Eed
Where: E——Comprehensive energy consumption per unit product, kg standard coal/t; L——Output of electrolytic caustic soda products,.
The comprehensive energy consumption per unit of caustic soda comparable product is calculated for the convenience of comparison within the industry, and is calculated according to formula (3): (eie+Ki)
Where: E is the comprehensive energy consumption per unit of comparable product, kg standard coal/Ki is the standard coal conversion coefficient of a certain energy specified in Appendix A, and F is the atmospheric environment temperature influence coefficient specified in Appendix C. 4.4 If there are multiple electrolytic caustic soda production processes or multiple specifications of products within the caustic soda production boundary, the comprehensive energy consumption of the products shall be calculated separately according to the processes and specifications. Among them, the energy consumption and loss of shared process equipment and auxiliary and ancillary facilities shall be apportioned according to the consumption and product energy consumption ratio.
5 Calculation of energy saving in caustic soda
Energy saving in caustic soda products refers to the reduction of energy consumption under the conditions of producing caustic soda products of the same specifications, varieties and quantities, and the reduction is the energy saving.
The energy saving of calcined pellets is calculated according to formula (4): Ei.-(Edi - Ed)Lb
Wherein: Ei—energy saving of caustic soda products, kg standard coal; Ecdi---comprehensive energy consumption per unit product of caustic soda during the base period, kg standard coal/t; Eedb---comprehensive energy consumption per unit product of caustic soda during the reporting period, kg standard coal/t; L,—output of caustic soda products during the reporting period, t.
Appendix A
Energy conversion coefficient for standard coal
(supplement)
Nengsong Mingmi
Washed coal
Washed medium coal
Swiss oil
Petroleum gas
Refined dry gas
Natural gas
Natural gas
Gas field natural gas
Coal mine gas
Heat (on the plate)
Electricity (on the certificate)
Electricity equivalent)
(kcai/kg)
(kcai/m')
kj/w+h
(kcai/kw + h)
J/standard n
Almost average low heat mother and average converted heat
209345000)
26 377(6300)
8 374(2000)
837412560(2000-3000)
28 470(6800)
41 868(10000)
41 868(16000)
43 124(10300)
43 12 No.(10300)
42705(10250)
50 241(12000)
46 055(11000)
38 979(9310)
35 588(8500)
14 654-16 747(3 500-4 000)
36 01(860)
11 840(2828)
10 802(2530)
Conversion coefficient of standard coal, tg standard baking/kg
0.2857--0.4256
1.330 0kg standard coal/m*wwW.bzxz.Net
*1.214 3kg standard coal/m
9:5000—-0.5714kg standard coal/ml
0.03#12kg standard coal/MJ
(0.14286kg standard/1000ca)
D.122 9kg Standard coal/kW.h
0.4040kgStandard baking/kW.k
0.36861gStandard coal/standard blood*
Purchased water
Deoxygenated water
Compressed air
Purified gas
Hot air (low pressure)
Transport gas
Other gases
2. Generated protective gas
b. Positive oil-secondary decomposition gas
C. Jiangshang hot double-decomposition gas
d. Coke condensation gas
e. Pressure gasification gas
Water gas
Coal tar
Flue gas
Conversion unit
(keai/m')
Ping Ni Zhe Re Wang
2.51(MJ/t)
600(kerl/t)
14.23(kcal/t)
3400(keai/t)
28.45(kcal/t)
6 800(keal/t)
1.17(M3/standard)
280(kc21/standard m)
0.88(MJ/standard m)
110(kcal/standard m)
11.72(MJ/standard m)
2800(kcsl/standard m)
19.66(MJ/standard m*)
+700(kcal/standard m)
6.28(MJ/standard m)
1500(keal/standard m)
3 785.60(MJ.1)
90(10*keal/t)
18 003(4300)
5234(1250)
19 259(4600)
35 588(8500)
16 329(3900)
15072(3600)
10 467(2500)
33 494(8000)
41 868(10000)
Appendix B
Calculation of Waste Heat Resources
(Supplement)
9 C, smoke (T200)
Wherein: Q——flue gas waste heat resource, kJ; Va-
-flue gas density, m;
-specific heat of flue gas when it leaves the boundary area, kJ/m·t; Cpa
T—flue gas outlet temperature, ℃
When the steam recovery device has good drainage (leakage rate ≤3%): Q-Gr (in - 419)
equivalent to standard coal, kg
3.6143kg standard coal/m
1.1429kg standard coal/kg
1.4286kg standard coal/kg
Wherein: Q——steam waste heat resource, kJ; Gn—external steam supply, kg;
ir—steam outlet temperature, kJ/kg.
When other situations: QG (ix—2677)
Liquid material, working fluid
QGC(—80)
Wherein: QThe amount of waste heat resource of externally supplied liquid material and working fluid, kJ; -The amount of externally supplied liquid material and working fluid, kg; G
Cpe—Specific heat of the out-of-boundary zone of externally supplied liquid material and working fluid: kJ/kg?tse
-Temperature of the out-of-boundary zone of externally supplied liquid material and working fluid, ℃B4Solid material
QC·G(-500)
Wherein: QThe amount of waste heat resource of externally supplied solid material, kJ; G—The amount of externally supplied solid material, kg;
Cp——Specific heat of the out-of-boundary zone of externally supplied material, kJ/kg?;z——Temperature of the out-of-boundary zone of externally supplied solid material, ℃. B5 gas material
O- G- C (t 200)
Wherein: Q-—waste heat resource disk of externally supplied gas material, kJ; G—heat of externally supplied gas material; kg;
C, gas—specific heat of the outbound zone of externally supplied gas material, kJ/kg?tsIg
—temperature of the outbound zone of externally supplied gas material, ℃. Appendix C
Influence coefficient of atmospheric environment temperature
(reference)
C1
Enterprise location (latitude)
South of 35° (not including 35°)
35 to 40° (including 35° and 40″)
North of 40° (excluding 40°)
Influence coefficient of atmospheric environment temperature F
Applicable conditions
Instantaneous production period
Heating period
Avoidance period
Non-production period4286kg standard coal/kg
Wherein: Q——steam waste heat resources, kJ; Gn—external steam supply, kg;
ir—steam out-of-bounds heat value, kJ/kg.
When other situations: QG (ix—2677)
Liquid material, working fluid
QGC(—80)
Wherein: QThe amount of waste heat resource of externally supplied liquid material and working fluid, kJ; -The amount of externally supplied liquid material and working fluid, kg; G
Cpe—Specific heat of the out-of-boundary zone of externally supplied liquid material and working fluid: kJ/kg?tse
-Temperature of the out-of-boundary zone of externally supplied liquid material and working fluid, ℃B4Solid material
QC·G(-500)
Wherein: QThe amount of waste heat resource of externally supplied solid material, kJ; G—The amount of externally supplied solid material, kg;
Cp——Specific heat of the out-of-boundary zone of externally supplied material, kJ/kg?;z——Temperature of the out-of-boundary zone of externally supplied solid material, ℃. B5 gas material
O- G- C (t 200)
Wherein: Q-—waste heat resource disk of externally supplied gas material, kJ; G—heat of externally supplied gas material; kg;
C, gas—specific heat of the outbound zone of externally supplied gas material, kJ/kg?tsIg
—temperature of the outbound zone of externally supplied gas material, ℃. Appendix C
Influence coefficient of atmospheric environment temperature
(reference)
C1
Enterprise location (latitude)
South of 35° (not including 35°)
35 to 40° (including 35° and 40″)
North of 40° (excluding 40°)
Influence coefficient of atmospheric environment temperature F
Applicable conditions
Instantaneous production period
Heating period
Avoidance period
Non-production period4286kg standard coal/kg
Wherein: Q——steam waste heat resources, kJ; Gn—external steam supply, kg;
ir—steam out-of-bounds heat value, kJ/kg.
When other situations: QG (ix—2677)
Liquid material, working fluid
QGC(—80)
Wherein: QThe amount of waste heat resource of externally supplied liquid material and working fluid, kJ; -The amount of externally supplied liquid material and working fluid, kg; G
Cpe—Specific heat of the out-of-boundary zone of externally supplied liquid material and working fluid: kJ/kg?tse
-Temperature of the out-of-boundary zone of externally supplied liquid material and working fluid, ℃B4Solid material
QC·G(-500)
Wherein: QThe amount of waste heat resource of externally supplied solid material, kJ; G—The amount of externally supplied solid material, kg;
Cp——Specific heat of the out-of-boundary zone of externally supplied material, kJ/kg?;z——Temperature of the out-of-boundary zone of externally supplied solid material, ℃. B5 gas material
O- G- C (t 200)
Wherein: Q-—waste heat resource disk of externally supplied gas material, kJ; G—heat of externally supplied gas material; kg;
C, gas—specific heat of the outbound zone of externally supplied gas material, kJ/kg?tsIg
—temperature of the outbound zone of externally supplied gas material, ℃. Appendix C
Influence coefficient of atmospheric environment temperature
(reference)
C1
Enterprise location (latitude)
South of 35° (not including 35°)
35 to 40° (including 35° and 40″)
North of 40° (excluding 40°)
Influence coefficient of atmospheric environment temperature F
Applicable conditions
Instantaneous production period
Heating period
Avoidance period
Non-production period
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