CN108728629B - Energy-saving direct-fire heating continuous heat treatment device - Google Patents
Energy-saving direct-fire heating continuous heat treatment device Download PDFInfo
- Publication number
- CN108728629B CN108728629B CN201710270200.2A CN201710270200A CN108728629B CN 108728629 B CN108728629 B CN 108728629B CN 201710270200 A CN201710270200 A CN 201710270200A CN 108728629 B CN108728629 B CN 108728629B
- Authority
- CN
- China
- Prior art keywords
- section
- direct
- energy
- jet
- preheating section
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention discloses an energy-saving direct-fire heating continuous heat treatment device, which comprises a smoke exhaust section, a primary preheating section, a secondary preheating section, a direct-fire heating section and a soaking section which are sequentially communicated; the smoke exhaust section comprises a smoke exhaust fan and a smoke exhaust pipeline; the one-level preheats the section and is two liang of jet-propelled bellows that set up relatively including the several, all is equipped with the jet nozzle on the opposite face of jet-propelled bellows, all is equipped with the heat exchanger in every jet-propelled bellows, all is equipped with circulating fan between every two relative jet-propelled bellows, and circulating fan is linked together with two jet-propelled bellows respectively through the circulation wind channel, still is equipped with the stabilizer roll between the relative jet nozzle, and the entrance and the exit of one-level preheating section are equipped with sealed roller respectively. The invention effectively improves the heat exchange quantity between the direct-fire heating combustion waste gas and the strip steel, fully utilizes the heat energy of the direct-fire heating combustion waste gas, realizes quick preheating and furthest improves the fuel utilization rate of the unit.
Description
Technical Field
The invention relates to the field of cold-rolled strip steel continuous heat treatment, in particular to an energy-saving direct-fire heating continuous heat treatment device.
Background
In order to reduce energy consumption, the conventional practice of the continuous heat treatment technique of cold rolled steel strip is to preheat the strip before the heat treatment area thereof using a preheating device. The existing direct-fired continuous heat treatment device is shown in figure 1, and the heat treatment device is divided into a smoke discharging section 1, a preheating section 2, a direct-fired heating section 3, a soaking section 4, a slow cooling section 5, a fast cooling section 6 and other heat treatment process sections according to the heat treatment process requirements of strip steel. The cleaned strip steel 7 enters a preheating section 2, the gas in the preheating section 2 is flue gas burnt by a direct-fired burner 8, the temperature of the flue gas entering the preheating section 2 is about 1000-1200 ℃, then the strip steel 7 is heated in the preheating section 2, because the flue gas after direct-fired burning also contains part of incompletely-burnt fuel gas, a afterburning burner 9 is arranged in the preheating section 2 to ensure the sufficient burning of the fuel gas, so that the strip steel 7 in the preheating section 2 is heated to about 200 ℃, the flue gas after complete burning in the preheating section 2 is about 700 ℃, the flue gas finally enters a waste heat recovery boiler 10, the secondary utilization of waste heat is carried out in the waste heat recovery boiler 10, superheated water or superheated steam is finally generated, the strip steel 7 in the preheating section 2 is heated to 200 ℃ and then enters a direct-fired heating section 3, and in the process section, the strip steel 7 is rapidly heated to over 700 ℃ through radiation and convection, then the heat treatment process requirement of the strip steel 7 is completed through the process sections of a soaking section 4, a slow cooling section 5, a fast cooling section 6 and the like, and qualified products are produced.
After analysis, the high-grade flue gas energy with the temperature of over 700 ℃ is directly used for generating steam and superheated water, which is huge energy waste for the effective utilization of energy. In the prior art, as disclosed in japanese patent No. h10-102151, a heat treatment apparatus is shown in fig. 2, a heating section of the heat treatment process mainly adopts radiant tube heating and radiant tube waste gas preheating, the combustion waste gas of the radiant tube in the preheating section exchanges heat with the furnace protection gas in a smoke exhaust channel, the heated furnace protection gas reheats the strip steel, the preheating mode is that a heat exchanger is outside the preheating furnace, so that large pipeline pressure and thermal loss are generated, and therefore, the efficiency is low, and on the other hand, because the circulating gas pressurization of the preheating section mainly depends on a circulating fan, the speed of circulating air in the furnace is not high, so that the heat exchange coefficient between the circulating gas and the strip steel is low.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an energy-saving direct-fire heating continuous heat treatment device, which effectively improves the heat exchange quantity between direct-fire heating combustion waste gas and strip steel, fully utilizes the heat energy of the direct-fire heating combustion waste gas, realizes quick preheating and furthest improves the fuel utilization rate of a unit.
In order to achieve the purpose, the invention adopts the following technical scheme:
an energy-saving direct-fire heating continuous heat treatment device comprises a smoke discharge section, a primary preheating section, a secondary preheating section, a direct-fire heating section and a soaking section which are sequentially communicated;
the smoke exhaust section comprises a smoke exhaust fan and a smoke exhaust pipeline, one end of the smoke exhaust pipeline is communicated with the primary preheating section, and the other end of the smoke exhaust pipeline is connected with the smoke exhaust fan;
the primary preheating section comprises a plurality of air injection air boxes which are arranged in pairs in an opposite mode, jet nozzles are arranged on opposite surfaces of the air injection air boxes, a heat exchanger is arranged in each air injection air box, a circulating fan is arranged between each two opposite air injection air boxes, the circulating fan is respectively communicated with the two air injection air boxes through a circulating air duct, stabilizing rollers are further arranged between the opposite jet nozzles, and sealing rollers are arranged at the inlet and the outlet of the primary preheating section respectively;
the inlet of the second-stage preheating section is communicated with the outlet of the first-stage preheating section, and a afterburning burner is arranged in the second-stage preheating section;
the inlet of the direct-fire heating section is communicated with the outlet of the secondary preheating section, and a plurality of direct-fire burners are arranged in the direct-fire heating section;
the entrance of soaking section is linked together with the exit of direct fire heating section, and the soaking section includes radiant tube, exhaust duct and plenum chamber, and on the exhaust duct was located to the radiant tube, exhaust duct's one end and plenum chamber intercommunication.
The primary preheating section is of a vertical structure or a horizontal structure.
The air jet bellows is made of heat-resistant stainless steel.
The air-jet bellows and the jet nozzle are both manufactured by adopting laser blanking and fine welding processes.
The heat exchanger is a shell-and-tube type gas-gas heat exchanger.
The direct-fired burner is a high-speed impact type direct-fired burner.
And in the primary preheating section of the horizontal structure, an intermediate carrier roller is arranged between the oppositely arranged jet nozzles.
The device also comprises a slow cooling section and a fast cooling section which are sequentially communicated with the soaking section, wherein the slow cooling section and the fast cooling section are cooled by air injection, vapor fog and water quenching.
In the above technical solution, the energy-saving direct-fire heating continuous heat treatment device provided by the present invention further has the following beneficial effects:
1. the invention adopts a two-stage preheating mode to preheat the strip steel, the strip steel is heated by the protective gas jet flow in the furnace in the first-stage preheating section, and the jet flow gas in the first-stage preheating section is isolated from the second-stage preheating section and the direct-fire heating section without influencing the atmosphere and pressure of the jet flow gas, so that the invention is not only suitable for a newly-built unit, but also can be well suitable for the reconstruction of the existing unit;
2. the invention can heat the strip steel to more than 400 ℃ or even higher through a two-stage preheating mode, and because the heat energy of the tail gas burned by the direct-fired burner is quickly transferred to the strip steel, the heat energy of the tail gas burned by the direct-fired burner is fully utilized, the heat efficiency of energy utilization is further improved, the final exhaust temperature of waste gas can be controlled to be about 200 ℃, and the energy waste is reduced to the maximum extent;
3. the invention can preheat the strip steel to a temperature higher than that in the prior art, so that the energy input of the direct-fire heating section can be correspondingly reduced, and the energy consumption and the annealing cost of each ton of steel can be reduced.
Drawings
FIG. 1 is a schematic structural view of a conventional direct-fired continuous heat treatment apparatus;
FIG. 2 is a schematic view of the structure of Japanese patent No. H10-102151;
FIG. 3 is a schematic diagram of the primary preheating section of the vertical configuration of the present invention;
FIG. 4 is a schematic diagram of the structure of the primary preheating section of the horizontal structure of the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the drawings and the embodiment.
Referring to fig. 3 and 4, the energy-saving direct-fired continuous heat treatment apparatus provided by the present invention sequentially comprises a first-stage preheating section 11, a second-stage preheating section 12, a direct-fired heating section 13, a soaking section 14, a slow cooling section 15, and a fast cooling section 16 according to a heat treatment process sequence.
Preferably, the primary preheating section 11 comprises a plurality of air-jet bellows 17 arranged in pairs in an opposite manner, jet nozzles 18 are arranged on opposite surfaces of the air-jet bellows 17, a heat exchanger 19 is arranged in each air-jet bellows 17, a circulating fan 20 is arranged between each two opposite air-jet bellows 17, the circulating fan 20 is respectively communicated with the two air-jet bellows 17 through a circulating air duct, stabilizing rollers 21 are further arranged between the opposite jet nozzles 18, a jet heating manner is adopted in the primary preheating section 11, the protective gas in the furnace is circulating gas, the circulating gas which is jetted by the jet nozzles 18 and heats the strip steel 7 is pressurized by the circulating fan 20 and then enters the air-jet bellows 17 through the circulating air duct, the heat exchanger 19 is arranged in the air-jet bellows 17, and after the circulating gas completes heat exchange with the combustion tail gas of the radiation pipe 29, is sprayed onto the strip steel 7 through the jet nozzles 18, so that the circulating gas in the furnace completes one cycle. In addition, because the band steel 7 is heated by jet flow, the distribution of a flow field and a pressure field in the primary preheating section 11 is very complicated, in order to reduce the vibration of the band steel 7 and avoid the band steel 7 from being scratched by the jet flow nozzle 18, one or more pairs of stabilizing rollers 21 are arranged in the middle of the primary preheating section 11, and sealing rollers 22 are respectively arranged at the inlet and the outlet of the primary preheating section 11 and used for isolating the influence of air outside the furnace on the atmosphere in the primary preheating section 11. The strip temperature of the strip steel 7 is gradually increased after the strip steel 7 is heated in the first-stage preheating section 11, generally, the average heating speed of the strip steel 7 with the thickness of 0.8mm in the first-stage preheating section 11 can be more than 30 ℃/s, and the strip steel 7 with the normal temperature can be heated to 150-350 ℃. The temperature of the combustion tail gas of the direct-fired burner 28 is gradually reduced after passing through the plurality of groups of heat exchangers 19, generally speaking, the exhaust gas temperature can be lower than 200 ℃, and is far lower than the exhaust gas temperature of the prior art, the flue gas is finally exhausted through the exhaust fan 24 and the exhaust gas pipeline 25 of the exhaust gas section 23, and the exhaust gas quantity is adjusted by arranging the exhaust gas adjusting valve 26 on the exhaust gas pipeline 25.
Preferably, the strip steel 7 enters the secondary preheating section 12 after being heated in the primary preheating section 11, the inlet of the secondary preheating section 12 is communicated with the outlet of the primary preheating section 11, and the secondary preheating section 12 is internally provided with a afterburning burner 27 for burning residual gas in the direct-fired heating section 13, so that the atmosphere is prevented from being polluted. Generally, the temperature of the flue gas entering the secondary preheating section 12 from the direct-fire heating section 13 is higher, even up to 1000-1200 ℃, the flue gas is discharged into the primary preheating section 11 after passing through the heating strip steel 7, the temperature of the flue gas is about 700 ℃, and the temperature of the strip steel 7 in the secondary preheating section 12 can be heated to 350-550 ℃ from 150-350 ℃.
Preferably, the inlet of the direct-fire heating section 13 is communicated with the outlet of the secondary preheating section 12, a plurality of direct-fire burners 28 are arranged in the direct-fire heating section 12, the direct-fire burners 28 adopt high-speed impact type direct-fire burners to heat the strip steel 7 by fast jet flow, according to the heat treatment process requirement of the strip steel 7, in the direct-fire heating section 13, the strip steel 7 needs to be heated to above 700 ℃ and then enters the soaking section 14, the inlet of the soaking section 14 is communicated with the outlet of the direct-fire heating section 13, the soaking section 14 comprises a radiation pipe 29, an exhaust pipeline 30 and a gas collecting chamber 31, and the soaking section 14 mainly burns heat released by gas through the radiation pipe 29 to radiate and heat the strip steel 7, so that the strip steel 7 can keep the temperature to meet the process requirement. The tail gas burnt by the radiant tube 29 is discharged into a gas collection chamber 31 through an exhaust pipeline 30, a regulating valve 32 is arranged on the gas collection chamber 31, and the burning pressure of the radiant tube 29 and the pressure in the gas collection chamber 31 can be controlled through the regulating valve 32.
Preferably, the strip steel 7 after being heated and soaked sequentially passes through other process sections such as a slow cooling section 15, a fast cooling section 16 and the like from the soaking section 14 to complete the heat treatment process requirements of the whole product, and finally the qualified product is output, wherein the cooling sections of the slow cooling section 15 and the fast cooling section 16 adopt the process technologies such as air injection cooling, steam fog cooling, water quenching cooling and the like.
Preferably, the air injection heating technology in the primary preheating section 11 can be of a vertical structure or a horizontal structure, and is mainly determined according to the equipment space arrangement of the unit, so that the air injection heating technology is not only suitable for a newly-built unit, but also well suitable for the reconstruction of the existing unit.
Preferably, the exhaust gas temperature of the secondary preheating section 12 is higher, generally about 700 ℃ or even higher, so the manufacturing material of the air injection bellows 17 in the primary preheating section 11 is made of heat-resistant stainless steel.
Preferably, the jet heating in the first-stage preheating section 11 is very fast, generally about 30-70 m/s, and inevitably causes the strip steel 7 to shake in production, and in order to prevent the strip steel 7 from being scratched by the jet nozzles 18 during shaking or the jet nozzles 18 from being damaged by the strip steel 7, a proper amount of stabilizing rollers 21 are arranged in the first-stage preheating section 11 with a vertical structure, and intermediate carrier rollers 33 are arranged between the jet nozzles 18 which are oppositely arranged in the first-stage preheating section 11 with a horizontal structure.
Preferably, the sizes of the air blowing box 17, the jet nozzle 18 and other equipment in the primary preheating section 11 have a remarkable influence on the convection heat exchange coefficient and the return air resistance of the air blowing heating, and the air blowing box 17, the jet nozzle 18 and other equipment are manufactured by adopting the process means of laser blanking, fine welding and the like, so that the size precision of the equipment can be ensured.
Preferably, the heat exchanger 19 is a shell-and-tube type gas-gas heat exchanger or other heat exchangers which can adapt to the forward flow, reverse flow and upward or vertical cross flow of the two gases because the combustion tail gas of the direct-fired burner 28 and the circulating gas in the primary preheating section 11 complete heat exchange in the air-jet wind box 17.
In addition, a certain amount of electric energy needs to be consumed in the operation of the circulating fan 20 in the first-stage preheating section 11, the power of the circulating fan 20 is positively correlated with the heat energy utilization rate of the exhaust gas of the second-stage preheating section 12, in order to utilize the direct-fired burner 28 to burn the heat energy of the exhaust gas as much as possible, the power consumption of the circulating fan 20 in the first-stage preheating section 11 can be controlled within a reasonable range, and various parameters of each heating device in the first-stage preheating section 11 are optimized, so that the device can operate under the most reasonable working condition. Meanwhile, in order to ensure the cleanliness of each heating device in the primary preheating section 11, the gas of the direct-fired burner 28 is natural gas.
In summary, the protective gas exchanges heat with the combustion waste gas of the direct-fired burner (or comprises part of the combustion waste gas of the soaking section) through the heat exchanger in the air injection bellows, the protective gas exchanges heat and is heated and then flows onto the strip steel, and the heat energy of the combustion waste gas of the direct-fired burner is fully absorbed by the protective gas in the furnace and then enters the smoke exhaust section. The flue gas in the secondary preheating section directly heats the strip steel, and the temperature of the flue gas in the secondary preheating section is higher, and the running direction of the strip steel is opposite to the running direction of the air flow, so the main heat transfer mode of the section is a radiation heat transfer mode and a laminar convection heat transfer mode of a flat plate with a slightly larger flue gas cross section, and a secondary combustion section is arranged at the rear part of the secondary preheating section. The direct fire heating section adopts jet flow impact type burner jet flow to heat the strip steel, the soaking section adopts a radiation tube heating mode, and the strip steel in the soaking section is soaked by radiation and natural convection under the atmosphere of protective gas in the furnace.
The technical scheme of the invention has good feasibility of implementation, can solve the problem of high exhaust gas temperature in the existing direct fire heating technology, fully utilizes the chemical energy of the fuel gas, and improves the heat efficiency of the fuel gas utilization.
In addition, the invention can rapidly and cleanly heat the strip steel in the primary preheating section, thereby not only saving energy, reducing emission, reducing cost and improving efficiency, but also further improving the productivity of the unit on the basis of the existing equipment capacity of the established unit, and the invention has wide popularization and application prospects in continuous annealing and hot galvanizing units. The primary preheating section can flexibly design the form, the heating capacity and the space appearance of the preheating equipment according to the existing conditions, and has strong field operability and practicability.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (8)
1. An energy-saving direct-fire heating continuous heat treatment device is characterized by comprising a smoke exhaust section, a primary preheating section, a secondary preheating section, a direct-fire heating section and a soaking section which are sequentially communicated;
the smoke exhaust section comprises a smoke exhaust fan and a smoke exhaust pipeline, one end of the smoke exhaust pipeline is communicated with the primary preheating section, and the other end of the smoke exhaust pipeline is connected with the smoke exhaust fan;
the primary preheating section comprises a plurality of air injection air boxes which are arranged in pairs in an opposite mode, jet nozzles are arranged on opposite surfaces of the air injection air boxes, a heat exchanger is arranged in each air injection air box, a circulating fan is arranged between each two opposite air injection air boxes, the circulating fan is respectively communicated with the two air injection air boxes through a circulating air duct, stabilizing rollers are further arranged between the opposite jet nozzles, and sealing rollers are arranged at the inlet and the outlet of the primary preheating section respectively;
the inlet of the second-stage preheating section is communicated with the outlet of the first-stage preheating section, a afterburning burner is arranged in the second-stage preheating section, and the afterburning burner burns residual fuel gas in the direct-fire heating section;
the inlet of the direct-fire heating section is communicated with the outlet of the secondary preheating section, and a plurality of direct-fire burners are arranged in the direct-fire heating section;
the entrance of soaking section is linked together with the exit of direct fire heating section, and the soaking section includes radiant tube, exhaust duct and plenum chamber, and on the exhaust duct was located to the radiant tube, exhaust duct's one end and plenum chamber intercommunication.
2. An energy-saving direct-fired continuous heat treatment device as claimed in claim 1, wherein said primary preheating section is of a vertical structure or a horizontal structure.
3. An energy-saving direct-fired heating continuous heat treatment apparatus as claimed in claim 1, wherein said air-jet bellows is made of a heat-resistant stainless steel material.
4. An energy-saving direct-fired heating continuous heat treatment device as claimed in claim 1, wherein said air-jet bellows and said jet nozzle are made by laser blanking and fine welding.
5. An energy-saving direct-fired heating continuous heat treatment device according to claim 1, wherein said heat exchanger is a shell-and-tube type gas-gas heat exchanger.
6. An energy-saving direct-fired heating continuous heat treatment device as claimed in claim 1, wherein said direct-fired burner is a high-speed impact type direct-fired burner.
7. An energy-saving direct-fire heating continuous heat treatment device as claimed in claim 2, wherein an intermediate carrier roller is arranged between the oppositely arranged jet nozzles in the primary preheating section of the horizontal structure.
8. The energy-saving direct-fired heating continuous heat treatment device according to claim 1, further comprising a slow cooling section and a fast cooling section which are sequentially communicated with the soaking section, wherein the slow cooling section and the fast cooling section are cooled by air injection, steam fog and water quenching.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710270200.2A CN108728629B (en) | 2017-04-24 | 2017-04-24 | Energy-saving direct-fire heating continuous heat treatment device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710270200.2A CN108728629B (en) | 2017-04-24 | 2017-04-24 | Energy-saving direct-fire heating continuous heat treatment device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108728629A CN108728629A (en) | 2018-11-02 |
| CN108728629B true CN108728629B (en) | 2019-12-31 |
Family
ID=63933784
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710270200.2A Active CN108728629B (en) | 2017-04-24 | 2017-04-24 | Energy-saving direct-fire heating continuous heat treatment device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108728629B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111424163A (en) * | 2019-01-10 | 2020-07-17 | 宝山钢铁股份有限公司 | Equipment and process for quickly realizing temperature transition of strip steel in continuous annealing furnace |
| CN117737393A (en) * | 2022-09-15 | 2024-03-22 | 宝山钢铁股份有限公司 | Jet radiant tube preheating system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202116595U (en) * | 2011-06-17 | 2012-01-18 | 攀钢集团有限公司 | Galvanizing continuous annealing furnace |
| CN202757129U (en) * | 2012-07-31 | 2013-02-27 | 中冶南方(武汉)威仕工业炉有限公司 | Multi-level preheating system with air and gas preheating radiant tube |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5825734B2 (en) * | 1980-08-12 | 1983-05-30 | 中外炉工業株式会社 | Radiant tube type continuous heat treatment furnace |
| JP2002294347A (en) * | 2001-03-28 | 2002-10-09 | Nippon Steel Corp | Method and device for jet preheating strip continuous annealing facility |
-
2017
- 2017-04-24 CN CN201710270200.2A patent/CN108728629B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202116595U (en) * | 2011-06-17 | 2012-01-18 | 攀钢集团有限公司 | Galvanizing continuous annealing furnace |
| CN202757129U (en) * | 2012-07-31 | 2013-02-27 | 中冶南方(武汉)威仕工业炉有限公司 | Multi-level preheating system with air and gas preheating radiant tube |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108728629A (en) | 2018-11-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108148999B (en) | Preheating system and preheating method suitable for continuous annealing and hot galvanizing | |
| CN100577825C (en) | Direct combustion type metallic tube bright heat treatment furnace | |
| CN103290191A (en) | Device for recycling afterheat of thermal treatment furnace | |
| CN108728629B (en) | Energy-saving direct-fire heating continuous heat treatment device | |
| CN103014312B (en) | Control method of regenerative burner of regenerative heating furnace | |
| CN108149000B (en) | Energy-saving continuous heat treatment system and heat treatment method thereof | |
| CN108149002B (en) | Continuous annealing preheating and waste heat recovery system and flexible control method thereof | |
| CN105420458A (en) | Quenching furnace flue gas reusing device and reusing method based on quenching furnace flue gas reusing device | |
| CN203295556U (en) | Heat-treatment furnace system for waste heat recovery | |
| CN100577826C (en) | Direct combustion type metallic tube bright heat treatment method | |
| CN204461072U (en) | A kind of energy-efficient aluminium bar Hybrid Heating stove | |
| CN202830108U (en) | Strip steel continuous annealing regenerative burning furnace | |
| CN202380054U (en) | Heating hood for hood-type annealing furnace | |
| CN105020703A (en) | Novel combustion device | |
| CN105238901A (en) | Multipurpose hot blast stove high-temperature preheating system | |
| CN210826252U (en) | Heat energy utilization system of quenching furnace | |
| CN201186941Y (en) | Direct combustion type metal pipes bright heat treatment furnace | |
| CN107014213B (en) | Heat accumulating type used for industrial furnace impacts heat transfer unit (HTU) | |
| CN209853984U (en) | Combustion type glass tempering heating device | |
| CN108148956A (en) | A kind of jumbo jet heating equipment of continuous annealing unit | |
| CN212512535U (en) | Steel band solution annealing furnace | |
| CN108151557A (en) | A kind of heat exchanger suitable for jet heating technique | |
| CN212747327U (en) | Metallurgical firing kiln | |
| CN204830908U (en) | Residual heat from flue gas utilizes system | |
| CN220304296U (en) | Waste heat utilization system for roller hearth heat treatment furnace |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |