CN114672625B - Energy-saving energy-storage environment-friendly heat treatment salt bath furnace - Google Patents
Energy-saving energy-storage environment-friendly heat treatment salt bath furnace Download PDFInfo
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- CN114672625B CN114672625B CN202210430858.6A CN202210430858A CN114672625B CN 114672625 B CN114672625 B CN 114672625B CN 202210430858 A CN202210430858 A CN 202210430858A CN 114672625 B CN114672625 B CN 114672625B
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- 150000003839 salts Chemical class 0.000 title claims abstract description 67
- 238000004146 energy storage Methods 0.000 title claims abstract description 44
- 238000010438 heat treatment Methods 0.000 title claims abstract description 37
- 239000000779 smoke Substances 0.000 claims abstract description 28
- 238000009413 insulation Methods 0.000 claims abstract description 24
- 238000011084 recovery Methods 0.000 claims abstract description 20
- 239000002918 waste heat Substances 0.000 claims abstract description 16
- 239000000428 dust Substances 0.000 claims abstract description 12
- 238000001914 filtration Methods 0.000 claims abstract description 12
- 230000007613 environmental effect Effects 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 51
- 238000004321 preservation Methods 0.000 claims description 16
- 239000007788 liquid Substances 0.000 claims description 11
- 239000000523 sample Substances 0.000 claims description 7
- 229910052799 carbon Inorganic materials 0.000 abstract description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 6
- 230000001502 supplementing effect Effects 0.000 abstract description 5
- 238000006386 neutralization reaction Methods 0.000 abstract description 3
- 230000009467 reduction Effects 0.000 abstract description 3
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 238000004064 recycling Methods 0.000 abstract description 2
- 239000002699 waste material Substances 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 7
- 238000001514 detection method Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000011449 brick Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005338 heat storage Methods 0.000 description 2
- 208000021063 Respiratory fume inhalation disease Diseases 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
- C21D1/44—Methods of heating in heat-treatment baths
- C21D1/46—Salt baths
-
- 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
- C21D11/00—Process control or regulation for heat treatments
-
- 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
-
- 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
- C21D9/0006—Details, accessories not peculiar to any of the following furnaces
-
- 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
-
- 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
- F27D17/002—Details of the installations, e.g. fume conduits or seals
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Devices For Medical Bathing And Washing (AREA)
Abstract
The invention discloses an energy-saving energy-storage environment-friendly heat treatment salt bath furnace, which comprises an insulation energy storage box, a temperature control device, a salt bath furnace body and a waste heat recovery circulating device arranged on one side of the salt bath furnace body, wherein a second electromagnetic valve is arranged at the top of the insulation energy storage box through a pipeline, a recovery pipe and a heat supplementing pipe are respectively arranged between the waste heat recovery circulating device and the insulation energy storage box, an insulation structure is arranged outside the salt bath furnace body, and a smoke dust filtering structure is connected at an intersection of the salt bath furnace body: energy saving, energy storage and environmental protection, effectively reduces the waste of energy sources and realizes the recycling of waste heat, combines low-carbon environmental protection and energy conservation and emission reduction, and meets the important national targets of carbon peak and carbon neutralization.
Description
Technical Field
The invention relates to the technical field of energy storage and environment-friendly waste heat recovery of a salt bath furnace, in particular to an energy-saving energy storage and environment-friendly heat treatment salt bath furnace.
Background
The heat treatment salt bath furnace shell is welded by angle steel and steel plates, an inner container made of the steel plates is placed in the heat treatment salt bath furnace shell, a hearth is built in the inner container by using refractory bricks, and insulating bricks are built between the inner container and the shell and filled with insulating powder. The electrode is buried from the side surface of the bottom of the salt tank, one surface is exposed out of the salt tank, the other three surfaces are buried in the refractory brick, and the salt furnace selects salts with different components as heating agents according to different working temperatures. When the salt furnace is started, a starting electrode is needed, and after salt is melted, heat is continuously generated due to the fact that current passes through the conductive dissolved salt, so that the salt furnace is kept in a melted state. Under the action of electromagnetic force, molten salt is continuously circulated to rapidly and uniformly heat the workpiece. The salt bath heat treatment furnace has the advantages of large comprehensive heat exchange coefficient, high workpiece heating speed, uniform heating and small deformation, and the workpiece is in tangential contact with the bath liquid. The heating capacity of the bath furnace is larger, the heating temperature fluctuation is small, the neutral state is easy to keep, the non-oxidation and non-decarburization heating is realized, and the local heating operation of the workpiece is easy to realize. The heat treatment salt bath furnace has the defects that a certain pollution is caused to the environment, occupational hazard is easily caused to the human body of an operator, the power is high, the energy consumption is high, the manufacturing cost of enterprises on products is increased, and the limited resources are wasted. Most enterprises call peak shifting to use electricity according to the state, and the heat treatment salt bath furnace is used in the electricity consumption low valley period from 22:00 to 06:00 a day, so the heat treatment salt bath furnace is suspended from 07:00 to 22:00 a, the temperature of the furnace body can be rapidly reduced during the stopping period, the furnace body needs to be heated when working next time, the service life of the furnace body is reduced, the energy consumption required by heating is increased due to the large temperature difference change of the furnace body, and the important aims of low-carbon, environment-friendly and energy-saving emission reduction of the state, and carbon peak and carbon neutralization are effectively realized; so we propose an energy-saving energy-storage environment-friendly heat treatment salt bath furnace so as to solve the problems.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an energy-saving energy-storage environment-friendly heat treatment salt bath furnace, which solves the problem of high energy consumption of the existing salt bath furnace.
In order to achieve the above purpose, the invention is realized by the following technical scheme: the utility model provides an energy-conserving energy storage environmental protection heat treatment salt bath stove, includes heat preservation energy storage case, temperature control device, salt bath stove body and locates waste heat recovery circulating device of salt bath stove body one side, heat preservation energy storage case top is equipped with the second electromagnetism water valve through the pipeline, waste heat recovery circulating device with be provided with recovery pipe and concurrent heating pipe between the heat preservation energy storage case respectively, be equipped with first manometer on the recovery pipe, be equipped with first motor circulating pump, third electromagnetism water valve and second motor circulating pump, fourth electromagnetism water valve on the concurrent heating pipe, first motor circulating pump, third electromagnetism water valve with second motor circulating pump, fourth electromagnetism water valve are parallelly connected, be equipped with the second manometer on the concurrent heating pipe and be close to waste heat recovery circulating device one side department, be provided with first liquid level gauge, second liquid level gauge and third liquid level gauge from bottom to top in the heat preservation energy storage case and be close to first motor circulating pump one side department is equipped with temperature detection probe, salt bath stove body outside is provided with the filter structure, the smoke and dust mouth of heat preservation stove body is connected.
Preferably, the temperature control device is electrically connected with each electromagnetic water valve.
Preferably, the heat insulation structure comprises a furnace cover heat insulation device, an upper heat insulation device and a furnace body side heat insulation device which are arranged on the outer side of the salt bath furnace body.
Preferably, the smoke filtering structure comprises a smoke suction device arranged at the mouth of the salt bath furnace body, the smoke suction device is connected with the input end of a smoke suction fan through a dust suction pipe, and the output end of the smoke suction fan is provided with filtering equipment.
Preferably, an infrared temperature sensor is arranged in the salt bath furnace body.
Preferably, the bottom of the heat preservation energy storage box is connected with a first electromagnetic water valve through a water outlet pipe.
Preferably, the water outlet pipe is connected with a pair of shunt pipes through a three-way joint.
Advantageous effects
The invention discloses an energy-saving energy-storage environment-friendly heat treatment salt bath furnace, which has the following beneficial effects: the invention is to install the waste heat collection circulation system and thermal insulation device to the outside of the body of the salt bath furnace, through the control of the temperature control system, the waste heat is recovered to the thermal insulation energy storage box to finish the energy storage work, when the heat treatment stops working in stages, the thermal insulation energy storage box starts to supplement the temperature reversely, so that the body of the salt bath furnace is cooled slowly, the heat treatment work in the next stage is carried out, the energy storage is carried out, the temperature difference change of rapid descent is reduced, the service life of the salt bath furnace is greatly prolonged, and when the temperature is raised again, the energy consumption required by the temperature rise can be reduced. And a smoke and dust absorbing pipeline is additionally arranged at the furnace mouth for a week, so that the smoke generated during working and heating is absorbed away, and the smoke is sent to the filtering and dust removing equipment through the pipeline, so that the health injury of the smoke and dust to staff is reduced. The invention relates to an energy-saving energy-storage environment-friendly heat treatment salt bath furnace, which is characterized in that: energy saving, energy storage and environmental protection, effectively reduces the waste of energy sources and realizes the recycling of waste heat, combines low-carbon environmental protection and energy conservation and emission reduction, and meets the important national targets of carbon peak and carbon neutralization.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the figure: 1. a heat-preserving energy storage box; 2. a temperature control device; 3. a waste heat recovery and circulation device; 4. a salt bath furnace body; 5. a furnace body side heat preservation device; 6. a filtering device; 7. a temperature detection probe; 8. a first level gauge; 9. a second level gauge; 10. a third level gauge; 11. a first solenoid water valve; 12. a second solenoid water valve; 13. a first motor circulation pump; 14. a second motor circulation pump; 15. a third solenoid water valve; 16. a fourth solenoid water valve; 17. a first pressure gauge; 18. a second pressure gauge; 19. a furnace cover heat preservation device; 20. a heat preservation device is arranged; 21. a smoke dust suction fan; 22. a smoke inhalation device; 23. an infrared temperature measuring sensor.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, the present invention provides a technical solution: the energy-saving energy-storage environment-friendly heat treatment salt bath furnace comprises an insulation energy storage box 1, a temperature control device 2, a salt bath furnace body 4 and a waste heat recovery circulating device 3 arranged on one side of the salt bath furnace body 4, wherein a second electromagnetic water valve 12 is arranged at the top of the insulation energy storage box 1 through a pipeline, a recovery pipe and a heat supplementing pipe are respectively arranged between the waste heat recovery circulating device 3 and the insulation energy storage box 1, a first pressure gauge 17 is arranged on the recovery pipe, a first motor circulating pump 13, a third electromagnetic water valve 15, a second motor circulating pump 14 and a fourth electromagnetic water valve 16 are arranged on the heat supplementing pipe, the first motor circulating pump 13, the third electromagnetic water valve 15, the second motor circulating pump 14 and the fourth electromagnetic water valve 16 are connected in parallel, a second pressure gauge 18 is arranged on one side of the heat supplementing pipe, which is close to the second electromagnetic water valve 12, a first liquid level device 8, a second liquid level device 9 and a third liquid level device 10 are respectively arranged in the insulation energy storage box 1, a temperature detecting probe 7 is arranged in parallel on one side of the heat supplementing pipe, and a smoke dust detecting structure is arranged on one side of the heat storage box 1, which is close to the first heat pump 4, and a smoke dust detecting structure is connected with the salt bath furnace body 4 is arranged on one side of the heat storage furnace body, and the heat preserving structure is connected with the salt bath furnace body 4; the heat insulation structure comprises a furnace cover heat insulation device 19, an upper heat insulation device 20 and a furnace body side heat insulation device 5 which are arranged on the outer side of the salt bath furnace body 4; the smoke filtering structure comprises a smoke suction device 22 arranged at the mouth of the salt bath furnace body 4, the smoke suction device 22 is connected with the input end of a smoke suction fan 21 through a dust suction pipe, and the output end of the smoke suction fan 21 is provided with a filtering device 6; an infrared temperature sensor 23 is arranged in the salt bath furnace body 4; the bottom of the heat-preservation energy storage box 1 is connected with a first electromagnetic water valve 11 through a water outlet pipe; the water outlet pipe is connected with a pair of shunt pipes through a three-way joint.
The components in this case are connected in sequence by a person skilled in the art, and specific connection and operation sequence should be referred to the following working principle, and the detailed connection means are known in the art, and the following working principle and process are mainly described.
Examples: when the water in the heat-preserving energy storage tank 1 is added to the first liquid level device 8, the second electromagnetic water valve 12 is stopped to add water under the control of the temperature control device 2, the salt bath furnace body 4 is controlled to heat, the fourth electromagnetic water valve 16 is controlled to be closed, the second motor circulating pump is closed, the third electromagnetic water valve 15 is opened, the first motor circulating pump 13 is controlled to work, when the first pressure gauge 17 is detected to be incorrect, the third electromagnetic water valve 15 is closed, the first motor circulating pump 13 is closed, the fourth electromagnetic water valve 16 is opened, the second motor circulating pump 14 is controlled to work, the heat recovery circulating device 3 and the furnace body side heat preservation device 5 return the water with the recovered heat to the heat-preserving energy storage tank 1, when the temperature detection probe 7 detects that the water temperature reaches a set temperature value a, the second electromagnetic water valve 12 is opened to add water, the second electromagnetic water valve 12 is closed when the temperature detection probe 7 detects the water temperature to reach a set temperature value b, the first electromagnetic water valve 11 is controlled to be opened by the temperature control device 2, and the heat supply and the washing water can be used. When the temperature detection probe 7 detects that the water temperature reaches the set temperature value c, the second electromagnetic water valve 12 is opened for adding water, and when the water level is added to the third liquid level device 10, the second electromagnetic water valve 12 is closed, and high-temperature early warning is prompted.
When the salt bath furnace body 4 starts to heat, the smoke suction fan 21 starts to work, smoke is sent into the filtering device 6 through the smoke suction device 22, and the filtering device is filtered and purified.
When the infrared temperature sensor 23 detects that the medium in the salt bath furnace body 4 reaches the set temperature, the work piece heating work is prompted to be performed.
When the heat treatment salt bath furnace is suspended from 07:00-22:00, the salt bath furnace body 4 is insulated through the furnace cover insulating device 19, the upper insulating device 20 and the furnace body side insulating device 5, and the temperature is reversely supplemented through the heat insulation energy storage box 1, so that the salt bath furnace body 4 is slowly cooled, the preheating time and energy loss of the salt bath furnace body 4 at the next time can be reduced, and the service life of the furnace body is reduced due to the fact that the temperature difference of refractory materials in the furnace body is required to be changed suddenly.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation. The term "comprising" an element defined by the term "comprising" does not exclude the presence of other identical elements in a process, method, article or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The utility model provides an energy-conserving energy storage environmental protection heat treatment salt bath stove, its characterized in that, include heat preservation energy storage case (1), temperature control device (2), salt bath stove body (4) and locate waste heat recovery circulating device (3) of salt bath stove body (4) one side, heat preservation energy storage case (1) top is equipped with second electromagnetic water valve (12) through the pipeline, waste heat recovery circulating device (3) with be provided with recovery pipe and heat filling pipe between heat preservation energy storage case (1) respectively, be equipped with first manometer (17) on the recovery pipe, be equipped with first motor circulating pump (13), third electromagnetic water valve (15) and second motor circulating pump (14), fourth electromagnetic water valve (16) on the heat filling pipe, first motor circulating pump (13), third electromagnetic water valve (15) with second motor circulating pump (14), fourth electromagnetic water valve (16) are parallelly connected, on the heat filling pipe and be equipped with second manometer (18) near waste heat recovery circulating device (3) one side department, in energy storage case (1) and be equipped with liquid level gauge (9) and be provided with in the temperature probe (7) and be close to one side of the liquid level gauge (7) by first level gauge (7) below the first side of water level gauge (7), the outside of the salt bath furnace body (4) is provided with a heat preservation structure, and a smoke dust filtering structure is connected to the furnace mouth of the salt bath furnace body (4);
the heat insulation structure comprises a furnace cover heat insulation device (19), an upper heat insulation device (20) and a furnace body side heat insulation device (5) which are arranged on the outer side of the salt bath furnace body (4).
2. The energy-saving energy-storage environment-friendly heat treatment salt bath furnace according to claim 1, wherein the smoke filtering structure comprises a smoke suction device (22) arranged at the furnace mouth of the salt bath furnace body (4), the smoke suction device (22) is connected with the input end of a smoke suction fan (21) through a dust suction pipe, and the output end of the smoke suction fan (21) is provided with a filtering device (6).
3. The energy-saving energy-storage environment-friendly heat treatment salt bath furnace as claimed in claim 2, wherein an infrared temperature sensor (23) is arranged in the salt bath furnace body (4).
4. The energy-saving energy-storage environment-friendly heat treatment salt bath furnace according to claim 1, wherein the bottom of the heat-preservation energy-storage box (1) is connected with a first electromagnetic water valve (11) through a water outlet pipe.
5. The energy-saving energy-storage environment-friendly heat treatment salt bath furnace according to claim 4, wherein the water outlet pipe is connected with a pair of split pipes through a three-way joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210430858.6A CN114672625B (en) | 2022-04-22 | 2022-04-22 | Energy-saving energy-storage environment-friendly heat treatment salt bath furnace |
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| CN202210430858.6A CN114672625B (en) | 2022-04-22 | 2022-04-22 | Energy-saving energy-storage environment-friendly heat treatment salt bath furnace |
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| CN114672625A CN114672625A (en) | 2022-06-28 |
| CN114672625B true CN114672625B (en) | 2023-12-12 |
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| CN211713158U (en) * | 2020-01-17 | 2020-10-20 | 凤城市千誉钛业有限公司 | Metal titanium heat treatment furnace with waste heat recovery structure |
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| CN112410521A (en) * | 2020-10-23 | 2021-02-26 | 宝钢集团南通线材制品有限公司 | Automatic recycling method and device for nitrate in steel wire salt bath heat treatment |
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