CN109472063A - A kind of modeling method of continuous galvanizing line energy efficiency model - Google Patents
A kind of modeling method of continuous galvanizing line energy efficiency model Download PDFInfo
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- 238000005246 galvanizing Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 30
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 115
- 239000011701 zinc Substances 0.000 claims abstract description 108
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 108
- 238000010438 heat treatment Methods 0.000 claims abstract description 38
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000010959 steel Substances 0.000 claims description 76
- 229910000831 Steel Inorganic materials 0.000 claims description 67
- 239000007789 gas Substances 0.000 claims description 29
- 239000007788 liquid Substances 0.000 claims description 27
- 230000005855 radiation Effects 0.000 claims description 23
- 238000000137 annealing Methods 0.000 claims description 14
- 230000001681 protective effect Effects 0.000 claims description 12
- 239000002912 waste gas Substances 0.000 claims description 9
- 238000012546 transfer Methods 0.000 claims description 8
- 230000006698 induction Effects 0.000 claims description 5
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 4
- 230000017525 heat dissipation Effects 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 3
- 230000005457 Black-body radiation Effects 0.000 claims description 2
- 238000010521 absorption reaction Methods 0.000 claims description 2
- 239000012080 ambient air Substances 0.000 claims description 2
- 239000002737 fuel gas Substances 0.000 claims description 2
- 230000004927 fusion Effects 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- 239000011787 zinc oxide Substances 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 11
- 239000000203 mixture Substances 0.000 abstract description 3
- 238000013507 mapping Methods 0.000 abstract description 2
- 239000000523 sample Substances 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 22
- 238000004519 manufacturing process Methods 0.000 description 12
- 229910052742 iron Inorganic materials 0.000 description 11
- 238000009423 ventilation Methods 0.000 description 9
- 238000005097 cold rolling Methods 0.000 description 6
- 229910001341 Crude steel Inorganic materials 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005273 aeration Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/08—Thermal analysis or thermal optimisation
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Abstract
The invention discloses a kind of modeling methods of continuous galvanizing line energy efficiency model, using energy stream theory, based on the conservation of energy, analyze the energy consumption composition of two parts of heating furnace and zinc pot in galvanizing unit producing line, probe into its energy stream composition and feature emphatically；Thereafter according to the internal relation and mapping mechanism of output power and various process parameters, equation of heat balance is established respectively, is summarized two parts energy consumption according to carbon emission principle, obtains a total energy efficiency model.Energy efficiency model established by the present invention is that the process parameter optimizing of subsequent discussion energy efficiency and the sorting consistence research of completion multiple target provide the foundation.Establishing the model is to go deep into follow-up study theoretical basis, and meaning is clear, reasonable, indispensable.
Description
Technical Field
The invention belongs to the technical field of energy optimization of a galvanizing unit, and particularly relates to a modeling method of an energy efficiency model of a hot galvanizing unit.
Background
According to data published by the national statistical bureau, in 12 months in 2017, the yield of crude steel is 6705 ten thousand tons, and the yield is increased by 1.8% on a same scale; the yield of the crude steel is 83173 ten thousand tons from 1 month to 12 months in 2017, and the yield is increased by 5.7 percent on a same scale. The large production of steel means remarkable energy consumption, for example 2014, the crude steel production of the Chinese iron and steel enterprises in the year is 8.23 hundred million tons and accounts for 49.5 percent of the global total production, the average energy consumption of the comprehensive coal per ton of steel is about 584.95 kilograms of standard coal, and the electricity consumption of the steel per ton of the national iron and steel enterprises is about 476.1 kilowatt-hours, so that the number is huge. The data calculated by taking the energy unit consumption of 100 of the Japanese iron and steel enterprise as a basic index are analyzed, the energy unit consumption of the Korean iron and steel enterprise is 105 which is slightly larger than the daily cost, the energy unit consumption of Europe is 110, the energy consumption of Chinese large and medium iron and steel enterprises is 130, the energy consumption of the whole industry is 150, the ton energy consumption of the Chinese iron and steel enterprise is 1.5 times that of the Japanese iron and steel enterprise, and the actual energy consumption level of the Chinese iron and steel enterprise is in a lagging level all over the world. Meanwhile, according to the international iron and steel association, an average of 1 ton of steel billet produced results in carbon dioxide emissions of 1.9 tons, and the carbon emissions of the iron and steel industry account for 51% of the total carbon emissions of the iron and steel industry worldwide, while 12% in the european union, 8% in japan, 7% in russia, 5% in the united states, and 17% in other countries.
The steel industry is a typical process industry, and the production process has the characteristics of complex process, strict production conditions, more production equipment, high automation degree and the like. Cold rolling is an important process in the steel industry, and the energy consumption of the cold rolling is greatly different from that of developed countries. Based on the analysis of a cold rolling production line of a certain steel plant, the cold rolling plant has three units of pickling, continuous annealing and galvanizing. The galvanizing unit in the cold rolling procedure has huge energy-saving potential, and the energy efficiency modeling of the whole production line is completed aiming at the galvanizing production line at present. Aeration, velocity, temperature are the core process parameters.
The areas with the most energy consumption of the galvanizing unit are as follows: a heating furnace area and a zinc pot area. In order to carry out effective energy-saving arrangement, the energy source and consumption of a working area must be analyzed, the mapping relation among the energy sources and consumption is found, and an energy efficiency balance equation of the continuous annealing furnace and the zinc pot is established.
Disclosure of Invention
In view of the above, the embodiment of the invention provides a modeling method of an energy efficiency model capable of analyzing the energy source and consumption relation of a galvanizing unit.
In order to solve the technical problems, the embodiment of the invention adopts the technical scheme that the modeling method of the energy efficiency model of the hot galvanizing unit comprises the following steps:
(1) calculating to obtain a heat balance equation of the heating furnace in the continuous annealing process according to the heat input of the heating furnace, the heat taken by the strip steel, the convection heat loss of the furnace wall, the radiation heat loss of the furnace wall, and the heat respectively taken by the waste gas and the protective gas;
(2) calculating to obtain a heat balance equation of the zinc pot according to the heat brought by the strip steel in the zinc pot, the induction heating supply heat, the convection heat loss of the surface of the zinc liquid, the radiation heat exchange quantity of the surface of the zinc liquid, the convection heat loss of the periphery of the zinc pot, the radiation heat exchange quantity of the periphery of the zinc pot, the convection heat loss of the bottom of the zinc pot, the radiation heat exchange quantity of the bottom of the zinc pot and the expenditure heat of a molten zinc ingot;
(3) and respectively correcting the heat balance equation of the heating furnace and the heat balance equation of the zinc pot by adopting a carbon emission factor, and then adding to obtain an energy efficiency model of the hot galvanizing unit.
The technical scheme provided by the embodiment of the invention has the following beneficial effects: according to the modeling method of the energy efficiency model of the hot galvanizing unit, the energy consumption composition of a heating furnace and a zinc pot in a production line of the hot galvanizing unit is researched on the basis of energy conservation according to an energy flow theory, thermal equilibrium equations are respectively established according to the relation between output power and each process parameter, and a total energy efficiency model is obtained through correction of carbon emission factors; the model can be used for analysis of a cold rolling production line, and core technological parameters of the model can be subjected to experimental setting of ventilation, speed and temperature according to the model, so that the effects of saving energy, reducing emission and improving yield are achieved.
Drawings
FIG. 1 is a schematic diagram of an energy efficiency model of a unit module of a continuous hot galvanizing unit according to an embodiment of the present invention;
FIG. 2 is a schematic comparison of calculated parameters and actual parameters in an annealing furnace strip steel according to the method of the embodiment of the invention;
FIG. 3 is a comparison diagram of the calculated parameters and the actual parameters in the zinc-bath strip steel according to the method of the embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be further described with reference to the accompanying drawings.
Example one
Referring to fig. 1, an embodiment of the present invention provides a modeling method of an energy efficiency model of a hot galvanizing unit, including the following steps:
(1) according to the heat input Q of the heating furnacerqThe strip steel takes away the heat Qdg2Convection heat loss Q of furnace wallldStove and rangeWall radiant heat quantity QlfHeat Q taken away by waste gas and protective gas respectivelyfq、QbhCalculating to obtain a heat balance equation of the heating furnace in the continuous annealing process;
specifically, the heat input Q of the heating furnacerqFor gas supply, strip heat removal Qdg2Convection heat loss Q of furnace wallldRadiation heat quantity Q of furnace walllfHeat Q taken away by waste gas and protective gas respectivelyfq、QbhAre respectively obtained through formulas (1) to (6),
Qrq＝Vrqhrq(1)
Qld＝αl(Tl-Th)Sl(3)
Qfq＝VfqCfq(Tf-Th) (5)
Qbh＝VbhCbh(Tq2-Tq1) (6)
wherein Q isrqHeat, Q, obtained for the furnacedg2Heat, Q, carried away for the strip steelldHeat, Q, dissipated for convection of furnace wall surfacelfFor radiant heat exchange of furnace walls, QfqHeat, Q, carried away for exhaust gasesbhThe unit of the heat taken away by the protective gas is kJ/h; vrqThe amount of gas introduced under standard state and V is the total amount of waste gas under standard state, and the unit is m3/h；hrqIs the heat value of the fuel gas and has the unit of kJ/m3；ρ2The density of the strip steel is 7.85 multiplied by 103kg/m3(ii) a b isWidth h of stripgThe thickness of the strip steel is m; v is the speed of the strip steel, and the unit is m/min; csThe heat capacity of the steel is expressed in kJ/(kg. DEG C); slIs the heat dissipation area of the furnace wall, and the unit is m2；TckFor strip outlet temperature, TiIs the instantaneous temperature, T, of the striprkFor the strip inlet temperature, TlIs the furnace wall temperature, ThIs the ambient temperature, TfIs the temperature, T, of the exhaust gasq2For temperature, T, of protective gas heated by radiant tubesq1α taking inlet temperature of shielding gas in units of ℃lIs the convection heat transfer coefficient of the furnace wall surface and has a unit of kJ/(m)2·h·℃)；εlbThe system blackness is obtained;is an angle coefficient; c1Black body radiation coefficient, 4.96 × 103kJ/(m2·h·K4)；TlIs the surface temperature, T, of the furnace wallhIs the ambient temperature, and the unit is K; c is the heat capacity of the exhaust gas, kJ/(m)3·℃)；
Wherein, the heat capacity of the strip steel is a quantity which changes along with the temperature, so the heat capacity can not be regarded as a constant, and the calculation formula is (7):
Cs＝1.34×10-11t5-3.7×10-8t4+4.007×10-5t3-0.02101t2+5.672t-179.6 (7)；
further, the total heat input Q of the furnace during continuous annealinglrMainly gas supply, i.e. heat Q obtained by the furnacerqThe total heat input Q of the heating furnace in the continuous annealing process is obtained by the formula (8)lrB, carrying out the following steps of; total thermal revenue Q from continuous annealinglrAnd total heat expenditure QlcBalancing, and obtaining a heat balance equation (12) according to equations (8), (9), (10) and (11);
Qlr＝Qrq(8)
Qlc＝Qdg2+Qfq+Qld+Qlf+Qbh(9)
Qlr＝Qlc(10)
Qrq＝Qdg2+Qfq+Qld+Qlf+Qbh(11)
(2) according to the heat quantity Q brought in by steel strip in a zinc potdg1Induction heating supply heat QgyThe heat Q dissipated by convection on the surface of the zinc liquidbdAnd the radiation heat exchange quantity Q of the surface of the zinc liquidbfThe heat Q dissipated by convection around the zinc potzdAnd the radiation heat exchange quantity Q around the zinc potzfHeat Q dissipated by convection at bottom of zinc potddRadiation heat exchange quantity Q at bottom of zinc potdfThe heat of molten zinc ingot discharge QrCalculating to obtain a heat balance equation of the zinc pot;
specifically, the strip steel in the zinc pot brings in heat Qdg1Induction heating supply heat QgyThe heat quantity Q dissipated by the convection of the surface of the zinc liquidbdAnd the radiation heat exchange quantity Q of the surface of the zinc liquidbfThe heat Q dissipated by convection around the zinc potzdAnd the radiation heat exchange quantity Q around the zinc potzfHeat Q dissipated by convection at bottom of zinc potddRadiation heat exchange quantity Q at bottom of zinc potdfThe heat of molten zinc ingotrObtained by the equations (13) to (21) respectively,
Qdg1＝60vbhgρ2·Cs(Tdg-Txy) (13)
Qgy＝3600N (14)
Qbd＝αb(Tb-Th)Sb(15)
Qzd＝αz(Tz-Th)Sz(17)
Qdd＝αd(Td-Th)Sd(19)
Qr＝[Cz(Tg-Ty)+L]60ρ1vbhx(21)
wherein Q isdg1Heat Q brought into zinc pot by strip steelgyHeat Q for supplying zinc pot for induction heatingbdHeat, Q, dissipated for zinc liquid surface convectionbfIs the radiant heat exchange quantity Q of the surface of the zinc liquidrHeat, Q, paid out for melting zinc ingotszdHeat, Q, dissipated for convection around zinc potzfIs the radiation heat exchange quantity Q around the zinc potddHeat, Q, dissipated for zinc pot bottom convectiondfThe unit is kJ/h of radiant heat exchange quantity at the bottom of a zinc pot; rho2The density of the strip steel is 7.85 multiplied by 103kg/m3；ρ1The density of zinc is 7.14X 103kg/m3(ii) a b is the width h of the strip steelgThickness, h, of the stripxThe thickness of the zinc layer is m; m; v is the speed of the strip steel, m/min; csIs the mass heat capacity, C, of steelzThe mass heat capacity of zinc is expressed in kJ/(kg. DEG C); t isdgThe temperature T of the strip steel when entering a zinc potxyThe working temperature T of the zinc liquidbIs the temperature of molten zinc, ThIs the ambient temperature, TgThe working temperature of the zinc liquid,TyThe original temperature of the zinc ingot is DEG C, N is active power, kW, αbIs the convection heat transfer coefficient of the surface of the zinc liquid, kJ/(m)2·h·℃)；εxyThe blackness of a zinc liquid with zinc oxide ash facing ambient air is measured;the angular coefficient of the zinc liquid level to the environment heat absorption surface is shown; c0Is the black body radiation coefficient, kJ/(m)2·h·K4) (ii) a L is latent heat of fusion of the zinc ingot, kJ/kg;
further, the total heat expenditure and the heat income of the induction heating zinc pot during production are equal, a heat balance equation (23) of the zinc pot is obtained through the equations (13) to (22),
Qdg1+Qgy＝Qbd+Qbf+Qzd+Qzf+Qdd+Qdf+Qr(22)
(3) and respectively correcting the heat balance equation of the heating furnace and the heat balance equation of the zinc pot by adopting a carbon emission factor, and then adding to obtain an energy efficiency model of the hot galvanizing unit.
Specifically, according to the principle of energy conservation, the energy of the zinc pot and the energy of the heating furnace can be fused from the energy angle, the electric energy consumed by the zinc pot and the heat energy consumed by the heating furnace are used as two independent and related energy, and the two energies are unified by adopting carbon emission factor correction so as to measure different source energies; obtaining a carbon emission energy efficiency model (27) of the unit mass of the hot galvanizing unit through formulas (24) to (26) according to the heat balance equations (12) and (22) obtained in the steps (1) and (2), the carbon emission factor, the power consumption consumed by the zinc pot and the heat consumption consumed by the heating furnace,
wherein,for total carbon emission, CEF,elc，CEF,gasCarbon emission factors expressed as electrical energy and thermal energy, respectively; sigma ECi，∑GCiRespectively representing the electricity consumption consumed by the zinc pot and the heat consumption consumed by the heating furnace.
Example two
According to the method provided by the embodiment of the invention, the energy efficiency calculation of the hot galvanizing unit is compared with the energy efficiency of the M1A1 steel in the actual hot galvanizing unit.
Before heating the strip steel, preheating the strip steel: the waste gas transfers heat to the protective gas through the heat exchanger, the strip steel is preheated through the protective gas, the strip steel is preheated through a preheating zone with a total path of 44m under the condition of no corrosion and speed maintenance, and the outlet temperature is about 180-200 ℃.
(1) After the strip steel is heated, a part of heat can be taken away, the thickness of the steel grade is 0.69mm, the width is 1479mm, the running speed is 110m/min, and the heat Q taken away by the strip steel can be obtained through the formulas (2) and (7)dg2；
(2) The protective gas and the waste gas take away partHeat, resulting in heat loss, Q is obtained from equation (5)fqIn an amount of Q obtained from the formula (6)bhThe amount of (c);
(3) heat Q of convection and radiation heat exchange on surface of heating furnaceld、QlfThe blackness of the commonly used engineering materials can be respectively obtained by the formulas (3) and (4) and is shown in the table 1:
TABLE 1 surface blackness of conventional engineering materials
(4) The total heat expenditure is 46500MJ/h, the heat income is the heat energy brought by the gas heating, and the heat value of the burning mixed gas is 7530+/-418KJ/Nm3From this, the required ventilation amount for heating the strip steel is 6175.299m calculated from the equation (12)3/h。
According to the actual monitoring data collected on site, the steel grade passes through seven heating zones in the heating furnace section, and the specific ventilation volume is shown in the table 2:
TABLE 2M2A1 strip heating section ventilation data
The actual ventilation quantity required by the strip steel is 6373.759m3And/h, obtaining an error by comparing the actual quantity with the calculated quantity.
The ventilation of the same type of strip steel with different specifications and the ventilation of different types of strip steel are respectively calculated and compared with the actual ventilation, and the specific data are shown in table 3:
TABLE 3 comparison table of calculation parameters and actual parameters of strip steel in annealing furnace
Referring to fig. 2, it is shown that the thermal equilibrium equation and the energy efficiency model established by the embodiment of the present invention can effectively predict the ventilation in practical applications.
The ceramic induction zinc pot is used in the hot galvanizing unit, the energy source mainly comprises heat brought by the cooled strip steel and heating of electric energy, and the output mainly comprises heat loss on the surface of zinc liquid (heat convection Q)bdAnd radiation heat exchange Qbf) And heat loss around the zinc pot (convection heat transfer Q)zdExchange heat with radiation Qzf) Heat dissipation at the bottom of the zinc pot (convection heat transfer Q)ddAnd radiation heat exchange Qdf) And the heat Q of the molten zinc ingotr。
(1) The temperature of the strip steel before entering the zinc pot is higher than the temperature of the zinc liquid, the strip steel brings energy income to the whole body, the same strip steel is selected for the annealing furnace, and the heat Q brought into the zinc pot by the strip steel is obtained through a carry-in type (13)dg1；
(2) The surface area of the zinc liquid is 12m2Convection and radiation heat dissipation Q of the surface of the zinc bathbd、QbfCalculated from the formula (15) and the formula (16), respectively; similarly, the convection heat exchange quantity Q of the zinc pot can be obtained by the formula (17) and the formula (18)zdAnd radiation heat exchange Qzf(ii) a The convection heat transfer Q at the bottom of the zinc pot obtained by the formula (19) and the formula (20)ddAnd radiation heat exchange Qdf；
(3) The zinc ingot absorbs energy when being melted, the strip steel galvanization is double-sided galvanization, and each side is 80g/m2The energy Q required at this time is calculated from the equation (21)r；
(4) The sum of the energy and the electric energy brought by the strip steel is equal to the total heat expenditure, and the electric power required at the moment can be 201kW by the formula (23).
The electric power of the strip steels of the same type and different specifications and the electric power of the strip steels of different types are respectively calculated according to the verification data in the annealing furnace, and are compared with the actual electric power to obtain specific data shown in Table 4
TABLE 4 comparison table of calculated parameters and actual parameters of zinc pot band steel
Referring to fig. 3, it is shown that the thermal balance equation and the energy efficiency model established in the embodiment of the present invention have small error with the data monitored in the actual application china, and the model has high precision and good accuracy.
In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.
The features of the embodiments and embodiments described herein above may be combined with each other without conflict.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. A modeling method of a hot galvanizing unit energy efficiency model is characterized by comprising the following steps:
(1) according to the heat input Q of the heating furnacerqThe strip steel takes away the heat Qdg2Convection heat loss Q of furnace wallldRadiation heat quantity Q of furnace walllfHeat Q taken away by waste gas and protective gas respectivelyfq、QbhCalculating to obtain a heat balance equation of the heating furnace in the continuous annealing process;
(2) according to the heat quantity Q brought in by steel strip in a zinc potdg1Induction heating of the supplied heatQgyThe heat Q dissipated by convection on the surface of the zinc liquidbdAnd the radiation heat exchange quantity Q of the surface of the zinc liquidbfThe heat Q dissipated by convection around the zinc potzdAnd the radiation heat exchange quantity Q around the zinc potzfHeat Q dissipated by convection at bottom of zinc potddRadiation heat exchange quantity Q at bottom of zinc potdfThe heat of molten zinc ingotrCalculating to obtain a heat balance equation of the zinc pot;
(3) and respectively correcting the heat balance equation of the heating furnace and the heat balance equation of the zinc pot by adopting a carbon emission factor, and then adding to obtain an energy efficiency model of the hot galvanizing unit.
2. The modeling method of the energy efficiency model of the hot galvanizing unit according to claim 1, wherein the heat income Q of the heating furnacerqFor gas supply, strip heat removal Qdg2Convection heat loss Q of furnace wallldRadiation heat quantity Q of furnace walllfHeat Q taken away by waste gas and protective gas respectivelyfq、QbhAre respectively obtained through the formulas (1) to (6),
Qrq＝Vrqhrq(1)
Qld＝αl(Tl-Th)Sl(3)
Qfq＝VfqCfq(Tf-Th) (5)
Qbh＝VbhCbh(Tq2-Tq1) (6)
wherein Q isrqHeat, Q, obtained for the furnacedg2Heat, Q, carried away for the strip steelldHeat, Q, dissipated for convection on the surface of furnace walllfIs a furnace wallRadiant heat exchange quantity, QfqHeat, Q, carried away for exhaust gasesbhThe unit of the heat taken away by the protective gas is kJ/h; vrqThe amount of gas introduced under standard state and V is the total amount of waste gas under standard state, and the unit is m3/h；hrqIs the heat value of the fuel gas and has the unit of kJ/m3；ρ2The density of the strip steel is 7.85 multiplied by 103kg/m3(ii) a b is the width h of the strip steelgThe thickness of the strip steel is m; v is the speed of the strip steel, and the unit is m/min; csThe heat capacity of the steel is expressed in kJ/(kg. DEG C); slIs the heat dissipation area of the furnace wall, and the unit is m2；TckFor strip outlet temperature, TiIs the instantaneous temperature, T, of the striprkFor the strip inlet temperature, TlIs the furnace wall temperature, ThIs the ambient temperature, TfIs the temperature, T, of the exhaust gasq2For temperature, T, of protective gas heated by radiant tubesq1α taking inlet temperature of shielding gas in units of ℃lIs the convection heat transfer coefficient of the surface of the furnace wall, and has the unit of kJ/(m)2·h·℃)；εlbThe system blackness is obtained;is an angle coefficient; c1Black body radiation coefficient, 4.96 × 103kJ/(m2·h·K4)；TlIs the surface temperature, T, of the furnace wallhIs the ambient temperature, and the unit is K; c is the heat capacity of the exhaust gas, kJ/(m)3·℃)。
3. The modeling method of the energy efficiency model of the hot galvanizing unit according to claim 2, wherein the total heat income Q of the heating furnace in the continuous annealing process is obtained through a formula (8)lrB, carrying out the following steps of; total thermal revenue Q from continuous annealinglrAnd total heat expenditure QlcBalancing, and obtaining a heat balance equation (12) according to equations (8), (9), (10) and (11);
Qlr＝Qrq(8)
Qlc＝Qdg2+Qfq+Qld+Qlf+Qbh(9)
Qlr＝Qlc(10)
Qrq＝Qdg2+Qfq+Qld+Qlf+Qbh(11)
4. the modeling method of the energy efficiency model of the hot galvanizing unit as claimed in claim 1, wherein the heat Q brought by the strip steel in the zinc potdg1Induction heating supply heat QgyThe heat Q dissipated by convection on the surface of the zinc liquidbdAnd the radiation heat exchange quantity Q of the surface of the zinc liquidbfThe heat Q dissipated by convection around the zinc potzdAnd the radiation heat exchange quantity Q around the zinc potzfHeat Q dissipated by convection at bottom of zinc potddRadiation heat exchange quantity Q at bottom of zinc potdfThe heat of molten zinc ingotrObtained by the equations (13) to (21) respectively,
Qdg1＝60vbhgρ2·Cs(Tdg-Txy) (13)
Qgy＝3600N (14)
Qbd＝αb(Tb-Th)Sb(15)
Qzd＝αz(Tz-Th)Sz(17)
Qdd＝αd(Td-Th)Sd(19)
wherein Q isdg1Heat Q brought into zinc pot by strip steelgyHeat Q for supplying zinc pot for induction heatingbdHeat, Q, dissipated for zinc liquid surface convectionbfIs the radiant heat exchange quantity Q of the surface of the zinc liquidrHeat, Q, paid out for melting zinc ingotzdHeat, Q, dissipated for convection around zinc potzfIs the radiation heat exchange quantity Q around the zinc potddFor heat, Q, convection dissipation at the bottom of the zinc potdfThe unit is kJ/h of radiant heat exchange quantity at the bottom of a zinc pot; rho2The density of the strip steel is 7.85 multiplied by 103kg/m3；ρ1The density of zinc is 7.14X 103kg/m3(ii) a b is the width h of the strip steelgThickness, h, of the stripxThe thickness of the zinc layer is m; m; v is the speed of the strip steel, m/min; csIs the mass heat capacity, C, of steelzThe mass heat capacity of zinc is expressed in kJ/(kg. DEG C); t isdgThe temperature T of the strip steel when entering a zinc potxyThe working temperature T of the zinc liquidbIs the temperature of molten zinc, ThIs the ambient temperature, TgIs the working temperature T of the zinc liquidyThe original temperature of the zinc ingot is DEG C, N is active power, kW, αbIs the convection heat transfer coefficient of the surface of the zinc liquid, kJ/(m)2·h·℃)；εxyThe blackness of a zinc liquid with zinc oxide ash facing ambient air is measured;the angular coefficient of the zinc liquid surface to the environment heat absorption surface is shown; c0Is the black body radiation coefficient, kJ/(m)2·h·K4) (ii) a L is the latent heat of fusion of the zinc ingot, kJ/kg.
5. The modeling method of the energy efficiency model of the hot galvanizing unit according to claim 4, wherein the heat balance equation (23) of the zinc pot is obtained through the formulas (13) to (22),
Qdg1+Qgy＝Qbd+Qbf+Qzd+Qzf+Qdd+Qdf+Qr(22)
6. the modeling method of the energy efficiency model of the hot galvanizing unit according to claim 1, wherein the carbon emission energy efficiency model (27) of the hot galvanizing unit per unit mass is obtained through equations (24) to (26) according to the heat balance equation and the carbon emission factor obtained in the steps (1) and (2) and the power consumption consumed by the zinc pot and the heat consumption consumed by the heating furnace,
wherein,for total carbon emission, CEF,elc，CEF,gasCarbon emission factors expressed as electrical energy and thermal energy, respectively; sigma ECi，∑GCiRespectively representing the electricity consumption consumed by the zinc pot and the heat consumption consumed by the heating furnace.
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