CN114838595B - MILD oxygen-enriched combustion-based waste heat recovery steel rolling heating furnace and heating method thereof - Google Patents
MILD oxygen-enriched combustion-based waste heat recovery steel rolling heating furnace and heating method thereof Download PDFInfo
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- CN114838595B CN114838595B CN202210390795.6A CN202210390795A CN114838595B CN 114838595 B CN114838595 B CN 114838595B CN 202210390795 A CN202210390795 A CN 202210390795A CN 114838595 B CN114838595 B CN 114838595B
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 182
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 106
- 239000001301 oxygen Substances 0.000 title claims abstract description 76
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 76
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 72
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 60
- 239000010959 steel Substances 0.000 title claims abstract description 60
- 238000005096 rolling process Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000002918 waste heat Substances 0.000 title claims abstract description 21
- 238000011084 recovery Methods 0.000 title claims abstract description 18
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 125
- 239000003546 flue gas Substances 0.000 claims abstract description 124
- 239000000446 fuel Substances 0.000 claims abstract description 85
- 238000002791 soaking Methods 0.000 claims abstract description 81
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 30
- 238000005516 engineering process Methods 0.000 claims abstract description 20
- 230000003647 oxidation Effects 0.000 claims abstract description 9
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 9
- 239000007800 oxidant agent Substances 0.000 claims description 46
- 230000001590 oxidative effect Effects 0.000 claims description 41
- 238000010992 reflux Methods 0.000 claims description 24
- 238000002347 injection Methods 0.000 claims description 15
- 239000007924 injection Substances 0.000 claims description 15
- 238000001354 calcination Methods 0.000 claims description 9
- 238000005507 spraying Methods 0.000 claims description 5
- 230000002269 spontaneous effect Effects 0.000 claims description 3
- 102200126521 rs4498440 Human genes 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 abstract description 13
- 230000009467 reduction Effects 0.000 abstract description 6
- 238000004134 energy conservation Methods 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 3
- 230000009466 transformation Effects 0.000 abstract description 3
- 238000007664 blowing Methods 0.000 abstract description 2
- 239000000779 smoke Substances 0.000 description 19
- 239000007789 gas Substances 0.000 description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 230000008569 process Effects 0.000 description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 238000010790 dilution Methods 0.000 description 6
- 239000012895 dilution Substances 0.000 description 6
- 238000009826 distribution Methods 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 230000005855 radiation Effects 0.000 description 4
- 238000004064 recycling Methods 0.000 description 4
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003085 diluting agent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000000376 reactant Substances 0.000 description 2
- 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
- 230000000052 comparative effect Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C6/00—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion
- F23C6/02—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in parallel arrangement
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
- F23C9/06—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for completing combustion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
- F23D11/10—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour
- F23D11/18—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour the gaseous medium being water vapour generated at the nozzle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
- F23D11/36—Details, e.g. burner cooling means, noise reduction means
- F23D11/38—Nozzles; Cleaning devices therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
- F23D11/36—Details, e.g. burner cooling means, noise reduction means
- F23D11/40—Mixing tubes or chambers; Burner heads
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/48—Nozzles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/62—Mixing devices; Mixing tubes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/84—Flame spreading or otherwise shaping
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K5/00—Feeding or distributing other fuel to combustion apparatus
- F23K5/002—Gaseous fuel
- F23K5/005—Gaseous fuel from a central source to a plurality of burners
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K5/00—Feeding or distributing other fuel to combustion apparatus
- F23K5/002—Gaseous fuel
- F23K5/007—Details
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K5/00—Feeding or distributing other fuel to combustion apparatus
- F23K5/02—Liquid fuel
- F23K5/06—Liquid fuel from a central source to a plurality of burners
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K5/00—Feeding or distributing other fuel to combustion apparatus
- F23K5/02—Liquid fuel
- F23K5/14—Details thereof
- F23K5/20—Preheating devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L13/00—Construction of valves or dampers for controlling air supply or draught
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L7/00—Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam
- F23L7/002—Supplying water
- F23L7/005—Evaporated water; Steam
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L7/00—Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam
- F23L7/007—Supplying oxygen or oxygen-enriched air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/02—Regulating fuel supply conjointly with air supply
- F23N1/027—Regulating fuel supply conjointly with air supply using mechanical means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention discloses a waste heat recovery steel rolling heating furnace based on MILD oxygen-enriched combustion and a heating method thereof, belonging to the technical field of metallurgical heat engineering. The steel rolling heating furnace comprises a preheating section, a heating section and a soaking section, wherein an oxygen main pipe, a flue gas main pipe, a fuel main pipe and a steam adjusting device are arranged on the heating section, the heating section comprises a heating section, a heating section … … and a heating section n, the oxygen main pipe is connected with the flue gas main pipe and the fuel main pipe respectively, and the steam adjusting device is arranged on the flue gas main pipe. According to the invention, MILD oxygen-enriched combustion is realized through the transformation of the heating furnace, the side-combustion oxygen-blowing staged combustion mode is adopted, the oxygen proportioning quantity is flexibly regulated, the oxygen-enriched combustion technology is combined with soft combustion, and the method is applied to the steel rolling heating furnace, so that the advantages of energy conservation and emission reduction of the oxygen-enriched combustion technology can be fully exerted, and the defects of the oxygen-enriched combustion technology can be overcome. Greatly reduces the generation concentration of nitrogen oxides in the heating process of the steel billet and the oxidation burning loss rate of the heated steel billet.
Description
Technical field:
the invention belongs to the technical field of metallurgical heat engineering, and particularly relates to a waste heat recovery steel rolling heating furnace based on MILD oxygen-enriched combustion and a heating method thereof.
The background technology is as follows:
the steel rolling heating furnace is the equipment with the highest energy consumption in the steel rolling process, and the energy consumption of the steel rolling heating furnace accounts for about 65% of the total energy consumption of steel rolling. Meanwhile, during the operation process of the steel rolling heating furnace, a large amount of NO can be discharged x And the like. Therefore, the reduction of the energy consumption of the heating furnace and the reduction of pollutant emission are important points of energy conservation and emission reduction in the steel rolling process.
Conventional combustion techniques typically use air as a combustion improver. The air contained 21% oxygen and 79% nitrogen. Wherein nitrogen does not participate in combustion, and is a main source of heat loss of the flue gas as the flue gas is discharged into the atmosphere. At the same time, nitrogen participates in thermal NO in the flue gas x Is generated. To avoid the above drawbacks, oxygen-enriched combustion technology for recycling flue gas has received attention. The oxygen-enriched combustion technology of flue gas recirculation uses pure oxygen as an oxidant, and in order to meet the temperature requirement, circulating flue gas is introduced as diluent gas. The technology uses pure oxygen to replace air, thereby greatly reducing N in the combustion process 2 Is reduced by N 2 Heat loss and N of exhaust gas 2 NO involved in formation of x The generation of the pollutants is reduced while the thermal efficiency of the heating furnace is greatly improved. Meanwhile, the main combustion products of the oxygen-enriched combustion technology of flue gas recirculation are carbon dioxide and water, and three-molecule CO in the combustion atmosphere 2 And H 2 The proportion of O is greatly improved, and the enhancementRadiation heat exchange in the furnace improves the heat transfer efficiency in the furnace.
The research at the present stage mainly focuses on the oxygen-enriched combustion technology, and patent CN 111964468A designs a premixed oxygen-enriched combustion system of a heating furnace, which can achieve the purposes of improving productivity, saving fuel, reducing emission and reducing investment cost to a certain extent, but in the industrial application of the oxygen-enriched combustion technology using flue gas recirculation on an industrial furnace, a small amount of N still exists in the furnace due to the problems of poor sealing and the like 2 Is impregnated with (a) a filler. Because pure oxygen and smoke are used for dilution, the oxygen-enriched combustion has the problems of uneven temperature distribution, poor flame stability and the like. Meanwhile, the oxygen-enriched combustion mode has high safety hazard.
The invention comprises the following steps:
the invention aims to overcome the defects in the prior art, and provides a waste heat recovery steel rolling heating furnace based on MILD oxygen-enriched combustion and a heating method thereof, wherein MILD oxygen-enriched combustion is realized through the transformation of the heating furnace, and the problems of oxygen-enriched combustion are overcome, so that the comprehensive effects of flue gas recycling, energy conservation and emission reduction are achieved. Specifically, a side-firing oxygen-blowing staged combustion mode is adopted, and the oxygen proportioning quantity is flexibly adjusted, so that the influence of gas heat value fluctuation is adapted and different heating process requirements are met. The oxygen-enriched combustion technology is combined with soft combustion and is applied to the steel rolling heating furnace. The soft combustion (moderate or intense low-oxygen dilution, MILD) is a novel low-oxygen dilution combustion technology, which utilizes high-speed jet to entrain hot flue gas in the furnace to heat and dilute reactants, so that the reaction is uniformly carried out in the heating furnace, and the non-uniformity of temperature distribution and NO in the furnace are reduced x Is generated. The oxygen-enriched combustion technology is combined with soft combustion, so that on one hand, the thermal efficiency of the heating furnace, the temperature uniformity in the furnace and the flame stability are improved, and on the other hand, O in the combustion process is regulated 2 /CO 2 /H 2 O ratio, minimizing NOx formation, avoiding excessive H 2 The O dilution causes the problems of reduced thermal efficiency, even flameout and the like caused by the condensation of water vapor on the furnace wall. Meanwhile, through a waste heat recovery system, waste heat of the flue gas is recycled to the maximum extent, high-temperature flue gas is effectively utilized, and a flue gas product CO is obtained 2 And H 2 O is used as the supply of triatomic molecules in the combustion process, so that the radiation heat transfer efficiency of the whole combustion is enhanced, the combustion is more sufficient, the temperature distribution is more uniform, and the heat efficiency of the heating furnace is improved. The advantages of energy conservation and emission reduction of the oxygen-enriched combustion technology can be fully exerted, and the defects of the oxygen-enriched combustion technology can be overcome.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the utility model provides a waste heat recovery steel rolling heating furnace based on MILD oxygen-enriched combustion, includes preheating section 1, heating section, soaking section 4, oxygen is responsible for 11, flue gas is responsible for 13, fuel is responsible for 15 and vapor regulating device 6, preheating section 1, heating section and soaking section 4 link to each other in proper order, the heating section set up a plurality of sections, including heating first section 2, heating second section, … …, and heating n section 3, oxygen be responsible for 11, flue gas is responsible for 13 and fuel is responsible for 15 and is linked to each other with preheating section 1, heating section and soaking section 4 respectively, vapor regulating device 6 set up on flue gas is responsible for 13.
The preheating section 1 is provided with a preheating section flue gas outlet 9, and the soaking section 4 is provided with an outlet furnace door 20;
the heating section and the soaking section are both provided with oxidant burners 18, the oxygen main pipe 11 is provided with a flow control device 10, the front end of the flow control device 10 is connected with an oxygen inlet, and the rear end of the flow control device is respectively connected into the heating section and the soaking section of the heating furnace through a plurality of oxygen branch pipes 12 and is particularly connected with the oxidant burners 18 of the heating section and the soaking section; the flue gas main pipe 13 is correspondingly connected with oxidant burners 18 of the heating section and the soaking section through a plurality of flue gas branch pipes 14;
the heating section and the soaking section are both provided with fuel nozzles 17, the soaking section 4 is provided with a soaking section flat flame nozzle 19, and the fuel main pipe 15 is connected with the fuel nozzles 17 of the heating section through a plurality of fuel branch pipes 16; the fuel main pipe 15 is respectively connected with a fuel burner 17 and a soaking Duan Pingyan burner 19 of the soaking section through fuel branch pipes 16;
the flue gas main pipe 13 and the fuel main pipe 15 are jointly provided with a flue gas reflux heat exchanger 8, the flue gas main pipe 13 is provided with a flue gas outlet 5 and a fan 7, the flue gas reflux heat exchanger 8 is arranged at the position of the flue gas outlet 5 of the preheating section of the heating furnace, the front end of the flue gas reflux heat exchanger is connected with the flue gas outlet 5 of the preheating section through a flue gas pipeline, and the rear end of the flue gas reflux heat exchanger is connected with the fan 7 through a pipeline; the high-temperature flue gas generated by the heating section and the soaking section 4 of the heating furnace flows back to the preheating section 1 due to negative pressure in the furnace, and is connected with a flue gas reflux heat exchanger through a flue gas outlet 5 of the preheating section; the flue gas reflux heat exchanger 8 is connected with a fuel inlet pipeline to realize the utilization of flue gas waste heat, so that the fuel is heated to about 400K to be preheated, and the aim of saving energy is effectively realized.
The front end of the fan 7 is connected with the smoke reflux heat exchanger 8, and the rear end of the fan is respectively connected into the heating section and the soaking section 4 of the heating furnace through the smoke branch pipe 14; the steam adjusting device 6 is arranged at the rear end of the fan 7; the fan 7 and the steam adjusting device 6 form a smoke circulating system, the fan 7 provides a power source for recycling smoke, and the steam adjusting device 6 controls CO in the smoke by adjusting the steam content 2 /H 2 O proportion, and realizes the effective adjustment of different proportions of the oxidant.
The heating section and the soaking section are connected with a certain number of burners; the fuel burner 17 and the oxidant burner 18 of the heating section and the soaking section 4 are arranged at the side end of the heating section, the soaking Duan Pingyan burner 19 of the soaking section 4 is arranged at the top end of the soaking section, the preheating section is not provided with a burner, and the preheating is performed by the backflow high-temperature flue gas in the combustion process.
Corresponding valves are arranged on the fuel burner 17, the oxidant burner 18 and the soaking Duan Pingyan burner 19, so that the amount of the introduced oxidant and fuel can be controlled conveniently.
The main flue gas pipe 13 is used for introducing flue gas (CO) 2 /H 2 O), the oxygen main pipe 11 is used for introducing O 2 。
A steel rolling heating method based on MILD oxygen-enriched combustion adopts the steel rolling heating furnace, and specifically comprises the following steps:
step 1, soft combustion:
starting a waste heat recovery steel rolling heating furnace based on MILD oxygen-enriched combustion, spraying premixed fuel to the heating furnace through a fuel nozzle, and placing steel blanks after the furnace temperature rises to the spontaneous combustion temperature of preheated fuelSpraying oxidant into the heating section and soaking section in a heating furnace, wherein the oxidant comprises O 2 、CO 2 And H 2 O, heating the steel billet, and controlling the spraying of O into the heating section 2 /CO 2 /H 2 The O volume ratio is (25-28): (65.8-69.5): (7.2-7.5), controlling the soaking section O 2 /CO 2 /H 2 The volume ratio of O is (15-18): (73.5-76.5): (8.5-11.5), controlling the fuel vertical injection of the heating section and the soaking section, wherein the injection angle of the oxidant is 30-45 degrees, the injection flow rate of the oxidant of the heating section is 130-160m/s, the injection flow rate of the oxidant of the soaking section is 100-120m/s, a stable MILD combustion state is achieved when no obvious flame front exists in the furnace and the temperature fluctuation in the furnace is lower than 15%, MILD oxygen-enriched combustion is realized in the heating section, and MILD oxygen-depleted combustion is realized in the soaking section;
step 2, temperature and pressure regulation in the furnace
Continuously heating to 1160-1180 ℃ of the hearth temperature of the preheating section 1; the hearth temperature of the first heating section 2 is 1200-1220 ℃; the hearth temperature of the nth heating section 3 is 1240-1260 ℃; the furnace temperature of the soaking section 4 is 1260-1280 ℃; the furnace pressure of the preheating section 1, the first heating section 2, the nth heating section 3 and the soaking section 4 is guaranteed to reach 15Pa to 20Pa, so that the suction of cold air is reduced, and the possibility of secondary oxidation is reduced; and (5) completing billet heating to obtain a heated billet.
In the step 1, steel billets comprise square billets, round billets, plate billets and the like, and the types of the steel billets comprise C45 steel, Q195 steel, Q235A steel, 40Mn steel, 70Mn steel, T12A steel, Y30 steel, DR510-50 steel and the like.
In the step 1, O 2 /CO 2 /H 2 O is sprayed by oxidant burner together.
In the step 1, the premixed fuel is formed by mixing air and fuel.
In the step 1, the oxidant high-speed jet is utilized to entrain hot smoke in the furnace to the reactant (CO 2 And H 2 O) heating and diluting to make the reaction uniformly proceed in the heating furnace, so as to implement MILD oxygen-enriched combustion in the heating section.
In the step 1, the MILD burns and catches the high-temperature flue gas generated by combustion under the entrainment action of fuel and oxidant air flow to form a mixed combustion state of fuel, oxygen and flue gas, so that the flame combustion area is increased, the flame frontal surface disappears under the mixed combustion state of the caught flue gas and fuel, and the ignition area is increased, wherein the injection speed of the oxidant is 130-160m/s.
In the step 2, the temperature of the hearth is sequentially increased along with the preheating section, the first heating section, the nth heating section and the soaking section of the heating furnace.
In the step 2, billet heating is completed, a preheating section flue gas outlet 9 is opened, a flue gas reflux heat exchanger is connected through a preheating section flue gas outlet pipeline, and the flue gas reflux heat exchanger is connected with a fuel inlet pipeline and a fan for flue gas waste heat utilization and flue gas recovery, so that the temperature of fuel is raised to about 400K for preheating. At the same time, the recovered flue gas is used as CO for device combustion 2 And H 2 O dilution gas is supplied, on the one hand, the redundant flue gas contains high-concentration CO 2 Realize CO 2 On the other hand, H 2 O，CO 2 When the three-photon molecules are used for sucking the smoke for combustion, the radiation heat transfer efficiency of the whole combustion is enhanced, so that the combustion is more sufficient, and the temperature distribution in the furnace is more uniform.
In the method, the water vapor regulating device is started to regulate the water vapor content and control CO in the flue gas 2 /H 2 The O proportion is then introduced into the furnace after flowing into the oxidant nozzle through the flue gas pipeline to be mixed with oxygen. The steam can be realized by a simple steam preparation system, the source of the product is simple and pollution-free, and the O is introduced 2 /CO 2 /H 2 The ratio of O can be adjusted, and the calcining efficiency is improved. After the heating furnace is finished, firstly closing O 2 、CO 2 And H 2 O valve, followed by closing the fuel/air valve.
In the step 2, the obtained heated billet has an oxidation burning loss rate of 0.5-1.0%.
In the step 2, the nitrogen oxide generation concentration in the billet heating and calcining process is detected to be 45mg/m 3 -100mg/m 3 。
In the step 2, the obtained heated steel billet has the oxidation burning loss rate of 0.5-0.8 percent, and the nitrogen oxide generation concentration in the steel billet heating and calcining process is 45mg/m through detection 3 -90mg/m 3 。
In the method, the flue gas reflux heat exchanger realizes effective heat exchange between high-temperature flue gas and premixed fuel, the waste heat of the high-temperature flue gas is fully utilized, the premixed fuel is introduced through the fuel nozzle after being heated to a certain temperature, when the premixed fuel is mixed with oxidant in a furnace, the formed combustible mixture has higher temperature, the combustion reaction speed is higher, the fuel can be completely combusted in a short time of flowing in a hearth with smaller excess air coefficient, the temperature is higher and stable, and thus, the combustion speed of the premixed fuel and the oxidant can be accelerated, and the virtuous cycle of fuel combustion is formed.
In the method, the fan and the steam adjusting device realize the reutilization of the flue gas, after the high-temperature flue gas is discharged through a flue gas outlet of the preheating section and exchanges heat through a heat exchanger, one part of the flue gas is discharged through the flue gas outlet, and the other part of the flue gas contains CO 2 And H 2 O is used as diluent gas to be connected to the oxidant nozzle to realize CO 2 And H 2 O is supplied for regulating CO 2 And H 2 O proportion, arranging a water vapor regulating device at one end of the flue gas pipeline close to the fan, and changing CO by regulating the water vapor content 2 And H 2 The ratio of O to realize O 2 /CO 2 /H 2 And (5) comprehensively controlling the O proportion. By using the method, on one hand, the system realizes the reutilization of the flue gas, so that CO in the flue gas 2 And H 2 O can be reused, and the purpose of energy saving is achieved; on the other hand, the water vapor regulating device can be realized only by a simple water vapor preparation system, the product source is simple and pollution-free, and the ventilation is realized
The invention has the beneficial effects that:
in the billet heating combustion process, the entrainment effect of the fuel and the high-speed oxidant airflow entrains and burns to generate high-temperature smoke, so that the mixed combustion of the fuel, the oxygen and the smoke is formedThe flame combustion area is increased, the flame frontal surface disappears due to the mixed combustion state of the sucked smoke and the fuel, the ignition area is increased, the temperature is even compared with the ordinary oxygen-enriched combustion, and the theoretical combustion temperature increase and the thermal NO caused by the oxygen-enriched form of the traditional combustion air are overcome x Improving the temperature uniformity of the hearth and the like.
Wherein the soaking section is due to O 2 The content is less, the flue gas generated by combustion contains CO which is not completely combusted, the flue gas flows back to the heating section due to negative pressure in the furnace to further combust, so that the CO which is not completely combusted in the flue gas is completely combusted in the heating section, the flue gas in the heating section is connected with the flue gas reflux heat exchanger through the flue gas outlet of the preheating section to exchange heat with fuel, and the flue gas is recycled under the action of the fan, so that not only is the waste heat recycled, but also the CO is realized 2 Is enriched with part of CO after enrichment 2 And combustion products H 2 O can be used as CO of the invention again after being proportionally regulated by the steam regulator 2 And H 2 O is supplied, and the smoke component contains H 2 O，CO 2 The three-atomic molecules are used for strengthening the radiation heat transfer efficiency of the whole combustion while sucking the smoke for combustion, so that the combustion is more sufficient, the temperature distribution is more uniform, and the generation concentration of nitrogen oxides in the billet heating process and the oxidation burning loss rate of the heated billet are greatly reduced.
Meanwhile, compared with the traditional flame heating furnace, the system is wholly different in that only different fuel nozzles and oxidant nozzles are contained, the heating furnace is identical to the original traditional steel rolling heating furnace, the system is simple, the transformation difficulty of the original traditional heating furnace is reduced, and MILD combustion is stable, so that the safety of the heating furnace is greatly improved.
Description of the drawings:
FIG. 1 is a schematic diagram of a waste heat recovery steel rolling heating furnace based on MILD oxygen-enriched combustion in the embodiment of the invention;
1-preheating section, 2-heating section, 3-heating section n, 4-soaking section, 5-gas outlet, 6-steam adjusting device, 7-fan, 8-gas reflux heat exchanger, 9-preheating section gas outlet, 10-flow control device, 11-oxygen main pipe, 12-oxygen branch pipe, 13-gas main pipe, 14-gas branch pipe, 15-fuel main pipe, 16-fuel branch pipe, 17-fuel burner, 18-oxidant burner, 19-soaking section flat flame burner, 20-outlet furnace door.
The specific embodiment is as follows:
the present invention will be described in further detail with reference to examples.
The billets used in the examples below were 250 x 250mm square billets and were C45 steel.
Example 1
A waste heat recovery steel rolling heating furnace based on MILD oxygen-enriched combustion is shown in a structural schematic diagram in fig. 1, and comprises a preheating section 1, a heating section and a soaking section 4 which are sequentially connected, an oxygen main pipe 11, a flue gas main pipe 13 and a fuel main pipe 15, wherein the 5-flue gas outlet, the 6-steam adjusting device, the 7-fan, the 8-flue gas reflux heat exchanger, the 9-preheating section flue gas outlet, the 10-flow control device, the 16-fuel branch pipe, the 17-fuel burner, the 18-oxidant burner, the 19-soaking section flat flame burner and the 20-outlet furnace door are sequentially connected. The heating section is provided with a plurality of sections, including a heating section 2, a heating section … … and a heating section n 3.
The preheating section 1 is provided with a preheating section flue gas outlet 9, and the soaking section 4 is provided with an outlet furnace door 20;
the heating section and the soaking section are both provided with oxidant burners 18, the oxygen main pipe 11 is provided with a flow control device 10, the front end of the flow control device 10 is connected with an oxygen inlet, and the rear end of the flow control device is respectively connected into the heating section and the soaking section of the heating furnace through a plurality of oxygen branch pipes 12 and is particularly connected with the oxidant burners 18 of the heating section and the soaking section; the flue gas main pipe 13 is correspondingly connected with oxidant burners 18 of the heating section and the soaking section through a plurality of flue gas branch pipes 14;
the heating section and the soaking section are both provided with fuel nozzles 17, the soaking section 4 is provided with a soaking section flat flame nozzle 19, and the fuel main pipe 15 is connected with the fuel nozzles 17 of the heating section through a plurality of fuel branch pipes 16; the fuel main pipe 15 is respectively connected with a fuel burner 17 and a soaking Duan Pingyan burner 19 of the soaking section through fuel branch pipes 16;
the flue gas main pipe 13 and the fuel main pipe 15 are provided with a flue gas reflux heat exchanger 8, a flue gas outlet 5, a fan 7 and a steam adjusting device 6, wherein the flue gas reflux heat exchanger 8 is arranged at the position of the flue gas outlet 5 of the preheating section of the heating furnace, the front end is connected with the flue gas outlet 5 of the preheating section through a flue gas pipeline, and the rear end is connected with the fan 7 through a pipeline; the high-temperature flue gas generated by the heating section and the soaking section 4 of the heating furnace flows back to the preheating section 1 due to negative pressure in the furnace, and is connected with a flue gas reflux heat exchanger through a flue gas outlet 5 of the preheating section; the flue gas reflux heat exchanger 8 is connected with a fuel inlet pipeline to realize the utilization of flue gas waste heat, so that the fuel is heated to about 400K to be preheated, and the aim of saving energy is effectively realized.
The front end of the fan 7 is connected with the smoke reflux heat exchanger 8, and the rear end of the fan is respectively connected into the heating section and the soaking section 4 of the heating furnace through the smoke branch pipe 14; the steam adjusting device 6 is arranged at the rear end of the fan 7; the fan 7 and the steam adjusting device 6 form a smoke circulating system, the fan 7 provides a power source for recycling smoke, and the steam adjusting device 6 controls CO in the smoke by adjusting the steam content 2 /H 2 O proportion, and realizes the effective adjustment of different proportions of the oxidant.
The heating section and the soaking section are connected with a certain number of burners; the fuel burner 17 and the oxidant burner 18 of the heating section and the soaking section 4 are arranged at the side end of the heating section, the soaking Duan Pingyan burner 19 of the soaking section 4 is arranged at the top end of the soaking section, the preheating section is not provided with a burner, and the preheating is performed by the backflow high-temperature flue gas in the combustion process.
Corresponding valves are arranged on the fuel burner 17, the oxidant burner 18 and the soaking Duan Pingyan burner 19, so that the amount of the introduced oxidant and fuel can be controlled conveniently.
The main flue gas pipe 13 is used for introducing flue gas (CO) 2 /H 2 O), the oxygen main pipe 11 is used for introducing O 2 。
A steel rolling heating method based on MILD oxygen-enriched combustion adopts the steel rolling heating furnace, and specifically comprises the following steps:
(1) The fuel/air burner valve is firstly opened and O is closed at the beginning of the operation of the heating furnace 2 、CO 2 And H 2 The O valve is connected with corresponding burners of the heating section 2, the heating section 3 and the soaking section 4 of the heating furnace respectively; the premixed fuel formed by air and fuel is sprayed from a fuel nozzle for combustion, the furnace is baked, after the furnace temperature is raised to the fuel spontaneous combustion temperature, the billet is placed in the heating furnace, O is opened 2 、CO 2 And H 2 O valve, injecting oxidant (including O 2 、CO 2 And H 2 O). The whole billet heating process is divided into a preheating section, a plurality of heating sections and a soaking section, wherein O is integrally used in the heating sections 2 /CO 2 /H 2 MILD oxygen-enriched combustion with O volume ratio of 25:67.5:7.5, and O is used in soaking section 2 /CO 2 /H 2 The O volume ratio is 15:73.5:11.5, the fuel vertical injection of the heating section and the fuel vertical injection of the soaking section are controlled, the injection angles of the oxidants are consistent and are 40 degrees, the injection flow rate of the oxidants of the heating section is 150m/s, the injection flow rate of the oxidants of the soaking section is 100m/s, the heating combustion is carried out until no obvious flame front exists in the furnace, when the temperature fluctuation in the furnace is 10%, a stable MILD combustion state is achieved, MILD oxygen-enriched combustion is realized in the heating section, and MILD oxygen-depleted combustion is realized in the soaking section;
(2) Continuously heating to 1180 ℃ of the hearth temperature of the preheating section 1; the hearth temperature of the first heating section 2 is 1220 ℃; the hearth temperature of the nth heating section 3 is 1260 ℃; the hearth temperature of the soaking section 4 is 1280 ℃; simultaneously, the furnace pressures of the preheating section 1, the first heating section 2, the nth heating section 3 and the soaking section 4 are guaranteed to be 15Pa, 17Pa, 18Pa and 20Pa, so that the suction of cold air is reduced, and the possibility of secondary oxidation is reduced; after the billet is heated, the heated billet is obtained, and the nitrogen oxide generation concentration in the billet heating and calcining process is 100mg/m 3 The final oxidation burning loss rate of the steel billet is 1.0%.
(3) And opening a preheating section flue gas outlet 9, connecting a flue gas reflux heat exchanger through a preheating section flue gas outlet pipeline, and connecting a fuel inlet pipeline and a fan through the flue gas reflux heat exchanger to perform flue gas waste heat utilization and flue gas recovery so as to heat fuel to 400K for preheating. At the same time, the recovered flue gas is used as CO for device combustion 2 And H 2 O dilution gas supply, on the one handThe redundant flue gas contains high-concentration CO 2 Realize CO 2 On the other hand, H 2 O，CO 2 When the three-photon molecules are used for sucking the smoke for combustion, the radiation heat transfer efficiency of the whole combustion is enhanced, so that the combustion is more sufficient, and the temperature distribution in the furnace is more uniform.
In the process of regulating the injection amount of the oxidant, the water vapor regulating device is turned on, and the CO in the flue gas is controlled by regulating the water vapor content 2 /H 2 The O proportion is then introduced into the furnace after flowing into the oxidant nozzle through the flue gas pipeline to be mixed with oxygen. The steam can be realized by a simple steam preparation system, the source of the product is simple and pollution-free, and the O is introduced 2 /CO 2 /H 2 The ratio of O can be adjusted, and the calcining efficiency is improved. After the heating furnace is finished, firstly closing O 2 、CO 2 And H 2 O valve, followed by closing the fuel/air valve.
The data of the above specific process parameters, nitrogen oxide formation concentration during billet heating and calcining, and final billet oxidation burn-out, etc. are shown in table 1 below.
Examples 2 to 8
The difference from example 1 is that the technical parameters of the soft combustion stage are different from those of the final billet in terms of the nitrogen oxide generation concentration in the heating and calcining process of the billet, and the difference parameters are shown in the following table 1.
Comparative examples D5-1 to 5-6
The difference from example 5 is that the technical parameters of the soft combustion stage are different from those of the final billet in terms of the nitrogen oxide generation concentration in the heating and calcining process of the billet, and the difference parameters are shown in the following table 1.
Table 1, wherein the concentration of nitrogen oxides is in mg/m 3
Claims (8)
1. The waste heat recovery steel rolling heating furnace based on the MILD oxygen-enriched combustion technology is characterized by comprising a preheating section, a heating section, a soaking section, an oxygen main pipe, a flue gas main pipe, a fuel main pipe and a steam adjusting device, wherein the preheating section, the heating section and the soaking section are sequentially connected, the heating section is provided with a plurality of sections, the heating section comprises a heating section one, a heating section two, a heating section … … and a heating section n, the oxygen main pipe, the flue gas main pipe and the fuel main pipe are respectively connected with the preheating section, the heating section and the soaking section, and the steam adjusting device is arranged on the flue gas main pipe;
the heating section and the soaking section are both provided with oxidant burners, the oxygen main pipe is provided with a flow control device, the front end of the flow control device is connected with an oxygen inlet, and the rear end of the flow control device is respectively connected into the heating section and the soaking section of the heating furnace through a plurality of oxygen branch pipes and is particularly connected with the oxidant burners of the heating section and the soaking section; the flue gas main pipe is correspondingly connected with the oxidant burner of the heating section and the soaking section through a plurality of flue gas branch pipes;
a steel rolling heating method based on MILD oxygen-enriched combustion adopts the steel rolling heating furnace, and specifically comprises the following steps:
step 1, soft combustion:
starting a waste heat recovery steel rolling heating furnace based on MILD oxygen-enriched combustion technology, spraying premixed fuel to the heating furnace through a fuel nozzle, placing a steel billet in the heating furnace after the furnace temperature rises to the spontaneous combustion temperature of the preheated fuel, and spraying an oxidant into a heating section and a soaking section, wherein the oxidant comprises O 2 、CO 2 And H 2 O, heating the steel billet, and controlling the spraying of O into the heating section 2 /CO 2 /H 2 The O volume ratio is (25-28): (65.8-69.5): (7.2-7.5), and controlling the soaking section O 2 /CO 2 /H 2 The volume ratio of O is (15-18): (73.5 to 76.5): (8.5-11.5), controlling the fuel injection of the heating section and the soaking section to be vertical, controlling the injection angle of the oxidant to be 30-45 degrees, until the stable MILD combustion state is achieved in the furnace,the MILD oxygen-enriched combustion is realized in the heating section, and the MILD oxygen-depleted combustion is realized in the soaking section;
step 2, temperature and pressure regulation in the furnace
Continuously heating to 1160-1180 ℃ of the hearth temperature of the preheating section; the hearth temperature of the first heating section is 1200-1220 ℃; the hearth temperature of the nth heating section is 1240-1260 ℃; the furnace temperature of the soaking section is 1260-1280 ℃; and ensuring that the furnace pressures of the preheating section, the first heating section, the nth heating section and the soaking section reach 15-20Pa, completing billet heating, and obtaining heated billets.
2. The heat recovery steel rolling heating furnace based on the MILD oxygen-enriched combustion technology according to claim 1, wherein the preheating section is provided with a preheating section flue gas outlet, and the soaking section is provided with an outlet furnace door.
3. The waste heat recovery steel rolling heating furnace based on the MILD oxygen-enriched combustion technology according to claim 1, wherein the heating section and the soaking section are both provided with fuel burners, the soaking section is provided with a soaking section flat flame burner, and the fuel main pipe is connected with the fuel burners of the heating section through a plurality of fuel branch pipes; the fuel main pipe is respectively connected with the fuel burner of the soaking section and the flat flame burner of the soaking section through fuel branch pipes.
4. The heat recovery steel rolling heating furnace based on the MILD oxygen-enriched combustion technology according to claim 1, wherein the flue gas main pipe and the fuel main pipe are jointly provided with a flue gas reflux heat exchanger, the flue gas main pipe is provided with a flue gas outlet and a fan, the flue gas reflux heat exchanger is arranged at the flue gas outlet position of a preheating section of the heating furnace, the front end is connected with the flue gas outlet of the preheating section through a flue gas pipeline, and the rear end is connected with the fan through a pipeline.
5. The method according to claim 1, wherein in step 1, the billet comprises square billet, round billet or slab, and the model comprises C45 steel, Q195 steel, Q235A steel, 40Mn steel, 70Mn steel, T12A steel, Y30 steel or DR510-50 steel; and when no obvious flame front exists in the furnace and the temperature fluctuation in the furnace is lower than 15%, the stable MILD combustion state is achieved.
6. The method according to claim 1, wherein in the step 2, the injection flow rate of the oxidant in the heating section is 130-160m/s, and the injection flow rate of the oxidant in the soaking section is 100-120m/s.
7. The steel rolling heating method based on MILD oxygen-enriched combustion according to claim 1, wherein in the method, billet heating is completed, a preheating section flue gas outlet is opened, a flue gas reflux heat exchanger is connected through a preheating section flue gas outlet pipeline, and the flue gas reflux heat exchanger performs flue gas waste heat utilization and flue gas recovery, so that fuel is heated for preheating.
8. The method for heating steel rolling based on MILD oxygen-enriched combustion as claimed in claim 1, wherein in said step 2, the obtained heated billet has an oxidation burning rate of 0.5% -1.0%, and the nitrogen oxide generation concentration during the billet heating and calcining is 45mg/m 3 -100mg/m 3 。
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