CN108148999A - A kind of pre-heating system and its pre-heating mean suitable for continuous annealing and galvanizing - Google Patents
A kind of pre-heating system and its pre-heating mean suitable for continuous annealing and galvanizing Download PDFInfo
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- CN108148999A CN108148999A CN201611094150.9A CN201611094150A CN108148999A CN 108148999 A CN108148999 A CN 108148999A CN 201611094150 A CN201611094150 A CN 201611094150A CN 108148999 A CN108148999 A CN 108148999A
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- jet
- bellows
- furnace body
- heat exchanger
- nozzle
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/562—Details
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/003—Apparatus
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- 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
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
Abstract
The invention discloses a kind of pre-heating systems and its application method suitable for continuous annealing and galvanizing, including circulator and fume extractor, circulator is connected with fume extractor, circulator includes furnace body, jet bellows, heat exchanger, jet nozzle, circulation air path and circulating fan, it is several right that jet bellows have, all it is set in furnace body, several jet nozzles are respectively provided on the opposite face of each pair of jet bellows, a heat exchanger is respectively provided in each jet bellows, jet bellows with side are connected by exhaust piping, circulating fan has several, it is all connected on the medial surface of furnace body, each circulating fan is connected by circulation air path with a pair of of jet bellows respectively；Fume extractor includes smoke exhaust fan, regulating valve and smoke discharging pipe.The present invention makes full use of the thermal energy of radiant tube combustion tail gas and realizes high-speed jet, rapidly and uniformly heats strip, promotes the production capacity of unit, also, the surface quality of strip will not be adversely affected.
Description
Technical field
The present invention relates to cold-strip steel continuous heat fields, are suitable for continuous annealing and hot dip more specifically to one kind
The pre-heating system and its pre-heating mean of zinc.
Background technology
Jet heating technique has some applications on strip and non-ferrous metal continuous heat production line, is there is coloured gold
Category field is mainly used for being heat-treated heating process section, and main application mode is horizontal air cushion furnace, and non-ferrous metal band is for band
Temperature uniformity in width direction is more demanding, and its blackness is relatively low, does not generally use spoke directly in heating process section
Pipe radiant heating is penetrated, but uses jet heating technique, foreign patent EP1507013A1 as shown in Figure 1：Band enters heating
After process section 8,9, heated using the method jet stream of jet and float band, again by radiant tube 21 after recyclegas jet stream band
It heats and passes through and enter jet bellows after circulating fan 20 is pressurized again by injection stream to strip surface, realize the continuous of band
The advantages of floating heating, the energy of heats band come from the heat of radiant tube burning release, this heating process is heating speed
Degree is than very fast, and temperature is than more uniform.
It is mainly used for drying strip and preheating section in strip continuous heat production line jet heating technique
Jet heats, and drying unit is typically mounted at after the pickling unit of strip, the rinsing of continuous annealing unit cleaning section or coater
Later, because the belt steel surface after completing upper acid cleaning process or continuous annealing entrance rinsing together is needed with many moisture
Hot-air seasoning is carried out into dryer, also needs to dry after coating unit coating.As shown in Fig. 2, it is mainly applied in industry at present
Jet drying unit be made of components such as wind turbine, valve, steam heater, pipeline, fan housings.Wind turbine 6 extracts new from nature
Enter steam heater 7 after wind supercharging, fresh air heated in the steam heater 7, the hot wind after heating by pipeline into
Enter fan housing 12 to dry strip, dry the hot wind after strip and discharged by air outlet 13,14.In addition steam is entered by steam
Mouth 2 enters steam heater 7 and exchanges heat with fresh air, is discharged by steam (vapor) outlet 3.The target of this jet drying technology is
The moisture of belt steel surface is eliminated in order to avoid causing to corrode to belt steel surface, is not that strip is heated using jet heating technique, no
Belong to the heating means of continuous annealing unit heating process section.
Jet heating technique is also widely used in continuous annealing preheating section, in general in order to reduce energy consumption cold-rolled strip
The orthodox practice of steel continuous heat technology is that it is preheated using preheating device before strip thermal treatment zone, preheating
The energy it is as shown in Figure 3 mostly from the combustion tail gas in radiant tube bringing-up section：Radiant tube burning after flue gas successively from flue gas into
Mouth enters heat exchanger 36 and then is discharged again from exhanst gas outlet.Recyclegas in preheating section 39 is completed through pipeline in heat exchanger 36
Enter jet nozzle 40 through pipeline after being pressurized after heat exchange by circulating fan 37, jet stream simultaneously heats strip 38, cold by strip 38
But the recyclegas after is again introduced into after heat exchanger 36 carries out heat exchange and completes one cycle.The shortcomings that jet heating technique
It is：Heat exchanger and circulating fan are placed in outside stove preheating section, and peripheral conduits complexity is huge, cause a large amount of resistance of ducting with
Thermodynamic loss, and the speed general control of jet stream is in 30m/s, it is relatively low.Pre-heat effect is poor, and final exhaust gas temperature is 350-
600 DEG C, a large amount of energy is wasted, according to measuring and calculating energy recovery rate less than the 5% of the unit combustion gas input energy.And it uses novel
Jet heating technique can be good at solving this problem, the utilization rate that can not only promote the existing unit energy also is able to soon
Speed uniformly heats strip.
Invention content
In view of the above defects of the prior art, the object of the present invention is to provide one kind to be suitable for continuous annealing and galvanizing
Pre-heating system and its pre-heating mean, make full use of the thermal energy of radiant tube combustion tail gas and realize high-speed jet, rapidly and uniformly
Strip is heated, promotes the production capacity of unit, also, the surface quality of strip will not be adversely affected.
To achieve the above object, the present invention adopts the following technical scheme that：
On the one hand, a kind of pre-heating system suitable for continuous annealing and galvanizing, including circulator and fume extractor, cycle dress
It puts and is connected with fume extractor, circulator includes furnace body, jet bellows, heat exchanger, jet nozzle, circulation air path and circulated air
Machine, it is several right that jet bellows have, and all in furnace body, is respectively provided with several jet nozzles on the opposite face of each pair of jet bellows, often
A heat exchanger is respectively provided in a jet bellows, the jet bellows with side are connected by exhaust piping, and circulating fan has
It is several, it is all connected on the medial surface of furnace body, each circulating fan is connected by circulation air path with a pair of of jet bellows respectively
It is logical；Fume extractor includes smoke exhaust fan, regulating valve and smoke discharging pipe, and smoke exhaust fan is connected by smoke discharging pipe with exhaust piping
Logical, regulating valve is set on smoke discharging pipe.
The circulating fan includes wind turbine, inlet scoop, air outlet and inverter motor, front and the inlet scoop phase of wind turbine
Even, the back side of wind turbine is connected with inverter motor, and there are two air outlet tools, is respectively connected to the top and bottom of wind turbine, each outlet air
Mouth is connected with circulation air path.
The heat exchanger is shell-and-tube heat exchanger.
The jet nozzle is round nozzle or slit-shaped nozzle, and the spacing of each jet nozzle is 50~300mm.
When the jet nozzle is round nozzle, a diameter of 8~20mm.
The jet bellows are heat-resistance stainless steel material, and are processed into using laser blanking.
The outside at the furnace body both ends is additionally provided with a pair of of sealed roller respectively.
On the other hand, a kind of pre-heating mean of energy-saving continuous heat system, includes the following steps：
S1. radiant tube burning waste gas is introduced in each jet bellows by the exhaust piping in circulator, utilizes jet
Heat exchanger in bellows converts the heat in burning waste gas；
S2. on the Btu utilization jet nozzle jet stream to strip heat exchanger converted out, jet heating is carried out to strip；
S3. the recyclegas generated after jet nozzle jet stream is heated by circulating fan is pressurized, then logical by recycling
Road enters jet bellows, and recyclegas is made to pass through jet nozzle after completing heat exchange with radiant tube burning waste gas in jet bellows
Again on jet stream to strip, recyclegas in furnace body is made to form one cycle；
S4. the radiant tube burning waste gas after heat is changed by converter, is arranged outward by smoke exhaust fan by smoke discharging pipe
Go out.
In the S2 steps, jet nozzle effluxvelocity is 40~100m/s.
In above-mentioned technical solution, the present invention has following advantageous effect：
1. the present invention fully can quickly and effectively utilize the thermal energy of radiant tube combustion tail gas, the heat utilization of combustion gas is improved
Rate, and jet bellows, heat exchanger and the circulating fan of the system are all built in furnace body, reduce pipeline to greatest extent
Along journey heating power and the pressure loss；
2. the present invention can quickly, cleaning, uniformly heat strip or even strip be heated to can in a short time
200~350 DEG C even higher, 100~150 DEG C of the remote high prior art, is heated as a result of recyclegas jet stream in furnace body
The mode of strip will not adversely affect the surface quality of strip；
3. the circulating fan of the present invention, can be according to the flow of burning waste gas, adjust automatically circulated air using frequency control
The rotating speed of machine can reduce the electric energy input of circulating fan to greatest extent.
Description of the drawings
Fig. 1 is the structure diagram of foreign patent EP1507013A1；
Fig. 2 is the structure diagram of existing jet drying unit；
Fig. 3 is the structure diagram of existing continuous annealing preheating section；
Fig. 4 is the structure diagram of the present invention；
Fig. 5 is the left view of Fig. 4；
Fig. 6 is the schematic diagram of installation circulating fan in both sides in furnace body of the present invention；
Fig. 7 is the longitudinally disposed schematic diagram of the present invention.
Specific embodiment
The technical solution further illustrated the present invention with reference to the accompanying drawings and examples.
Incorporated by reference to shown in Fig. 4 to Fig. 5, a kind of pre-heating system suitable for continuous annealing and galvanizing provided by the present invention wraps
Include circulator and fume extractor, circulator is connected with fume extractor, circulator include furnace body 100, jet bellows 101,
Heat exchanger 102, jet nozzle 103, circulation air path 104 and circulating fan 105, it is several right that jet bellows 101 have, all set on furnace body
In 100, several jet nozzles 103 are respectively provided on the opposite face of each pair of jet bellows 101, jet nozzle 103 is to strip 99
Jet stream simultaneously heats, and a heat exchanger 102 is respectively provided in each jet bellows 101, and the jet bellows 101 with side pass through flue gas leading
Road 106 is connected, and exhaust piping 106 is the exhaust gas that radiant tube burns is introduced in jet bellows 101, and radiant tube burns
Gas for natural gas, make the exhaust gas that burning comes out cleaner, ensure that total system can be with long continuous operation, circulating fan
105 have several, are all connected on the medial surface set on furnace body 100, each circulating fan 105 by circulation air path 104 respectively with
A pair of of jet bellows 101 are connected, and every a pair of of jet bellows 101 is made all to be connected and are configured with a circulating fan 105, circulating fan
105 by 103 jet stream of jet nozzle and after heating the supercharging of the recyclegas after strip 99, enter jet bellows 101 from circulation air path
It is interior, then after completing heat exchange with radiant tube burning waste gas, then by jet nozzle 103 jet stream to strip 99, such furnace body 100
Interior recyclegas completes one cycle, which is also the protective gas in furnace body 100, and main function is preheating furnace body
Strip 99 in 100, and the Gas Jet in Fig. 1 is the fresh air drawn from nature, the main function of hot fresh air is dehumidifying.
Fume extractor includes smoke exhaust fan 106, regulating valve 107 and smoke discharging pipe 108, and smoke exhaust fan 106 passes through smoke exhaust pipe
Road 108 is connected with exhaust piping 106, and regulating valve 107 is set on smoke discharging pipe, and the heat exchanger more than 102 in jet bellows 101 follows
Ring gas carries out heat exchange, is discharged later by smoke discharging pipe 108 by smoke exhaust fan 106, and regulating valve 107 is opening and closing
Smoke discharging pipe 108 and the uninterrupted for adjusting exhaust gas in smoke discharging pipe 108.
Preferably, the circulating fan 105 includes wind turbine 109, inlet scoop 110, air outlet 111 and inverter motor 112,
The front of wind turbine 109 is connected with inlet scoop 110, to draw the recyclegas in furnace body 100, the back side of wind turbine 109 and frequency conversion
Motor 112 is connected, and there are two the tools of air outlet 111, is respectively connected to the top and bottom of wind turbine 109, each air outlet 111 is with following
Ring air duct 104 is connected, and recyclegas is re-fed into jet bellows 101, and uses inverter motor 112 can be according to the heat of unit
Load condition adjusts the effluxvelocity of jet nozzle 103 the heating speed of strip 99 and circulating fan more than 105 to be controlled to radiate
The heat exchange amount of pipe burning waste gas ensures the whole working condition always in an optimization of the present invention.
Preferably, the heat exchanger 102 is shell-and-tube heat exchanger, due to being followed in radiant tube burning waste gas and furnace body 100
Ring gas completes heat exchange in jet bellows 101, therefore heat exchanger 102 can be effective for the thermal energy of radiant tube burning waste gas
It utilizes.
Preferably, according to jet stream forced-convection heat transfer rule, the distance of jet nozzle 103 to strip 99 is to 99 surface of strip
The influence of convection transfer rate is also very big, therefore the jet nozzle 103 is disposed as round nozzle or slit-shaped nozzle,
The distance of jet nozzle 103 to strip 99 also should be less than the width of 7 times of nozzles or the diameter of spray orifice.The spacing of each jet nozzle
For 50~300mm.When jet nozzle 103 is round nozzle, a diameter of 8~20mm, the convection transfer rate for heating jet
It is had a significant impact with back wind resistance.
Preferably, the exhaust gas temperature of radiant tube burning waste gas is higher, generally at 400~700 DEG C, therefore jet bellows 101
It is processed into for heat-resistance stainless steel material, and using laser blanking so as to control the precision of size
Preferably, the outside at 100 both ends of furnace body is additionally provided with a pair of of sealed roller 113 respectively, to separate furnace body 100
Influence of the outer air to atmosphere in furnace body 100, while also eliminate influence of the furnace body 100 to radiant tube heating combustion atmosphere.
It as shown in fig. 6, can also required by such as thering is required or installation space to have to the air quantity of jet stream in special circumstances
Both sides in furnace body 100 are all installed by circulating fan 105 respectively.The operation of circulating fan 105 needs to expend a certain amount of electric energy,
The power of the circulating fan 105 heat utilization rate positive correlation with radiant tube burning waste gas again, in order to make full use of radiant tube
The thermal energy of burning waste gas and the electricity consumption of the circulating fan 105 in preheating section can be controlled within rational application range,
The parameters of the system will pass through adequately optimization, so that system can be run under rational operating mode.
As shown in fig. 7, needs of the present invention according to production scene, can also be in longitudinally disposed, make the design spirit of the present invention
It is living, there is very strong field operation and exploitativeness.
A kind of pre-heating mean of energy-saving continuous heat system of the present invention, includes the following steps：
S1. radiant tube burning waste gas is introduced in each jet bellows 101 by the exhaust piping 106 in circulator, profit
The heat in burning waste gas is converted with the heat exchanger 102 in jet bellows 101；
S2. on Btu utilization jet nozzle 103 jet stream to strip 99 heat exchanger 102 converted out, strip 99 is carried out
Jet heats；
S3. the recyclegas generated after 103 jet stream of jet nozzle is heated by circulating fan 105 is pressurized, then by
Circulation canal 104 enters jet bellows 101, and recyclegas is made to complete heat with radiant tube burning waste gas in jet bellows 101 and is handed over
By the way that recyclegas in furnace body 100 on jet nozzle 103 again jet stream to strip 99, is made to form one cycle after changing；It is different from Fig. 3
It is that the recyclegas major part pipe arrangement in Fig. 3 is outside stove, and heat exchanger also is disposed on the outside of furnace body, causes
Largely along journey heat and the pressure loss；
S4. the radiant tube burning waste gas after heat is changed by converter 102, by smoke discharging pipe 108 by smoke exhaust fan
106 discharge, and the regulating valve 107 on smoke discharging pipe 108 controls the size of exhausted air quantity.
Preferably, in the S2 steps, the mode of heating of strip 99 is mainly arrived in jet heating using jet stream injection 103,
Jet nozzle effluxvelocity is 40~100m/s, in order to ensure the convection transfer rate on 99 surface of strip, meets adding for strip 99
Thermal velocity.
It is important to note that exhaust gas before exhaust piping is discharged always in furnace interior, pass through heat exchanger
Pipe, shell side and recyclegas separate, and both ensure that the cleannes of Gas Jet in this way or have effectively prevented radiant tube burning useless
The energy loss of gas, and the energy loss of entire circulator can only be scattered and disappeared by furnace shell outer wall, and energy loss is generally come
It says less than 5%, this ensure that a large amount of energy is absorbed by strip, the residual heat of radiant tube burning waste gas is adequately utilized
Energy.
In conclusion in general for the strip of 0.8mm, the average heating rate of jet heating technique be more than 30 DEG C/
S, and radiant tube combustion tail gas gradually reduces successively by the jet bellows of several string formations connection with temperature after heat exchanger, in general
Exhaust gas temperature should can be less than 200 DEG C (waste heat recovery rate accounts for about the 15-20% of the system combustion gas input energy).
Those of ordinary skill in the art it should be appreciated that more than embodiment be intended merely to illustrate the present invention,
And be not used as limitation of the invention, as long as in the spirit of the present invention, the change to embodiment described above
Change, modification will be all fallen in the range of claims of the present invention.
Claims (9)
1. a kind of pre-heating system suitable for continuous annealing and galvanizing, which is characterized in that including circulator and fume extractor, cycle
Device is connected with fume extractor, and circulator includes furnace body, jet bellows, heat exchanger, jet nozzle, circulation air path and circulated air
Machine, it is several right that jet bellows have, and all in furnace body, is respectively provided with several jet nozzles on the opposite face of each pair of jet bellows, often
A heat exchanger is respectively provided in a jet bellows, the jet bellows with side are connected by exhaust piping, and circulating fan has
It is several, it is all connected on the medial surface of furnace body, each circulating fan is connected by circulation air path with a pair of of jet bellows respectively
It is logical；Fume extractor includes smoke exhaust fan, regulating valve and smoke discharging pipe, and smoke exhaust fan is connected by smoke discharging pipe with exhaust piping
Logical, regulating valve is set on smoke discharging pipe.
2. a kind of energy-saving continuous heat system as described in claim 1, which is characterized in that the circulating fan includes
Wind turbine, inlet scoop, air outlet and inverter motor, the front of wind turbine are connected with inlet scoop, and the back side of wind turbine is connected with inverter motor,
There are two air outlet tools, is respectively connected to the top and bottom of wind turbine, and each air outlet is connected with circulation air path.
3. a kind of energy-saving continuous heat system as described in claim 1, which is characterized in that the heat exchanger is shell
Formula heat exchanger.
4. a kind of energy-saving continuous heat system as described in claim 1, which is characterized in that the jet nozzle is
Round nozzle or slit-shaped nozzle, the spacing of each jet nozzle is 50~300mm.
5. a kind of energy-saving continuous heat system as claimed in claim 4, which is characterized in that the jet nozzle is circle
During shape nozzle, a diameter of 8~20mm.
6. a kind of energy-saving continuous heat system as described in claim 1, which is characterized in that the jet bellows are resistance to
Hot stainless steel, and be processed into using laser blanking.
7. a kind of energy-saving continuous heat system as described in claim 1, which is characterized in that outside the furnace body both ends
Side is additionally provided with a pair of of sealed roller respectively.
8. a kind of pre-heating mean of energy-saving continuous heat system, which is characterized in that include the following steps：
S1. radiant tube burning waste gas is introduced in each jet bellows by the exhaust piping in circulator, utilizes jet bellows
Interior heat exchanger converts the heat in burning waste gas；
S2. on the Btu utilization jet nozzle jet stream to strip heat exchanger converted out, jet heating is carried out to strip；
S3. the recyclegas that generates is pressurized after jet nozzle jet stream is heated by circulating fan, then by circulation canal into
Enter jet bellows, recyclegas is made to be penetrated again by jet nozzle after completing heat exchange with radiant tube burning waste gas in jet bellows
It flows on strip, recyclegas in furnace body is made to form one cycle；
S4. the radiant tube burning waste gas after heat is changed by converter, is discharged by smoke discharging pipe by smoke exhaust fan.
A kind of 9. pre-heating mean of energy-saving continuous heat system as claimed in claim 8, which is characterized in that the S2
In step, jet nozzle effluxvelocity is 40~100m/s.
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| CN201611094150.9A CN108148999B (en) | 2016-12-02 | 2016-12-02 | Preheating system and preheating method suitable for continuous annealing and hot galvanizing |
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| CN201611094150.9A CN108148999B (en) | 2016-12-02 | 2016-12-02 | Preheating system and preheating method suitable for continuous annealing and hot galvanizing |
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| CN111644128A (en) * | 2020-07-09 | 2020-09-11 | 山东齐鲁增塑剂股份有限公司 | Transformation method for saving electric energy of heat treatment system in phthalic anhydride production process |
| CN112756162A (en) * | 2020-12-24 | 2021-05-07 | 山东国铭球墨铸管科技有限公司 | Energy-saving coating system for nodular cast iron pipe |
| WO2022241969A1 (en) * | 2021-05-21 | 2022-11-24 | 重庆赛迪热工环保工程技术有限公司 | Nozzle structure and zinc-aluminum-magnesium special sectional cooler comprising same |
| CN115491628A (en) * | 2022-09-23 | 2022-12-20 | 南通市一帆钢绳有限公司 | Be used for wire rope tin-plating processingequipment |
| WO2024056072A1 (en) * | 2022-09-15 | 2024-03-21 | 宝山钢铁股份有限公司 | High-speed jet and radiation combined heating device and rapid heating method thereof |
| WO2024056070A1 (en) * | 2022-09-15 | 2024-03-21 | 宝山钢铁股份有限公司 | Injection radiant tube preheating system |
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