CN112143992A - Temperature-variable oxidation-reduction integrated pretreatment process and treatment device thereof - Google Patents
Temperature-variable oxidation-reduction integrated pretreatment process and treatment device thereof Download PDFInfo
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- CN112143992A CN112143992A CN202011144015.7A CN202011144015A CN112143992A CN 112143992 A CN112143992 A CN 112143992A CN 202011144015 A CN202011144015 A CN 202011144015A CN 112143992 A CN112143992 A CN 112143992A
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- 238000010438 heat treatment Methods 0.000 claims abstract description 19
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- 229910045601 alloy Inorganic materials 0.000 description 5
- 239000000956 alloy Substances 0.000 description 5
- HXFVOUUOTHJFPX-UHFFFAOYSA-N alumane;zinc Chemical compound [AlH3].[Zn] HXFVOUUOTHJFPX-UHFFFAOYSA-N 0.000 description 5
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- 238000013461 design Methods 0.000 description 3
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- 239000002918 waste heat Substances 0.000 description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
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- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
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- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
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- 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
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
-
- 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
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- 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
- C23C2/38—Wires; Tubes
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- Chemical Kinetics & Catalysis (AREA)
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- Organic Chemistry (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention relates to a temperature-variable oxidation-reduction integrated pretreatment process, which solves the problems in the prior art and has the technical scheme that pretreatment is carried out in an oxidation-reduction furnace, the height of the front end of a steel wire fed into the oxidation-reduction furnace is lower than that of the rear end of the steel wire, and the process comprises the following steps: step one, introducing hydrogen-nitrogen mixed gas into an oxidation reduction furnace to reduce an oxide layer on the surface layer of the steel wire into pure iron; step two, the front section of the oxidation reduction furnace is an oxidation working section, and the rear section of the oxidation reduction furnace is a reduction working section by heating the oxidation reduction furnace in a high-temperature section and a constant-temperature section in a segmented manner; inputting hydrogen-nitrogen mixed gas from the tail of the reduction furnace, and discharging the hydrogen-nitrogen mixed gas from the front end of the reduction furnace; and step four, adjusting the integral input quantity of the mixed gas and the proportion of hydrogen in the mixed gas in real time by detecting the state of the combustion flame until the temperature-variable oxidation-reduction integrated pretreatment process is completed.
Description
Technical Field
The invention belongs to a steel wire hot galvanizing and zinc alloy technology, and particularly relates to a temperature-variable oxidation-reduction integrated pretreatment process and a treatment device thereof.
Background
A large number of scientific studies and practices have shown that: the corrosion of the zinc and zinc alloy coated steel wire under the environmental conditions of air, water, soil and the like is mainly shownMainly used for electrochemical corrosion. Research and development of plating technology for inhibiting and isolating corrosion of steel wires by corrosive media such as air, water, soil and the like are the most effective measures for prolonging the service life of the steel wires. The research finds that: the zinc, the aluminum, the magnesium and the rare earth elements play a role in protecting the steel wire from being corroded in the corrosion process. The main action is as follows: zinc-due to the lower electron potential than iron, plays a role in cathodic protection; aluminum-due to its very high tendency to form Al2O3The protective film plays a role in effective isolation protection; the rare earth is known as industrial monosodium glutamate because of the function of refining crystal grains and purifying crystal boundaries; magnesium-because of being very easy to produce the magnesium oxide protective film, has played the corrosion-resistant function to resist wear.
Taking a zinc-aluminum alloy coating as an example, in general, in the anticorrosive film formation process I, the initial oxidation stage of the coating is mainly protected by a Zn cathode, and a silvery white surface is presented; in the anticorrosive film forming process II, in the pre-coating oxidation stage, Zn cathode protection is taken as main alumina protection and is taken as auxiliary alumina protection, so that a matt surface is formed; in the anticorrosive film formation process III, in the later oxidation stage of the coating, a gray black surface is presented by taking the protection of an aluminum oxide film as a main part and the protection of a Zn cathode as an auxiliary part; and in the anticorrosive film forming process, a continuous protection stage of the coating is shown, and a continuous gray black surface is mainly protected by an aluminum oxide film.
The prior more processes are solvent methods, a large amount of chemical solvents such as acid, alkali, salt and the like are used in the pretreatment process of the solvent method, and the energy consumption is large; furthermore, the solvent method has a large dependence on water, and a large amount of wastewater with solvent is generated in the production process, so that the influence on the environment is large.
Disclosure of Invention
The invention solves the problems that a large amount of chemical solvents such as acid, alkali, salt and the like are used in the pretreatment process in the prior art, the energy consumption is high, and a large amount of wastewater with the solvents is generated in the production process, and provides a temperature-variable oxidation-reduction integrated pretreatment process and a treatment device thereof.
The technical scheme adopted by the invention for solving the technical problems is as follows: a temperature-variable oxidation-reduction integrated pretreatment process is carried out in an oxidation-reduction furnace, the height of the front end of a steel wire fed into the oxidation-reduction furnace is lower than that of the rear end of the steel wire, and the process comprises the following steps:
step one, introducing hydrogen-nitrogen mixed gas into an oxidation reduction furnace to reduce an oxide layer on the surface layer of the steel wire into pure iron;
step two, the front section of the oxidation reduction furnace is an oxidation working section, and the rear section of the oxidation reduction furnace is a reduction working section by heating the oxidation reduction furnace in a high-temperature section and a constant-temperature section in a segmented manner;
inputting hydrogen-nitrogen mixed gas from the tail of the reduction furnace, and discharging the hydrogen-nitrogen mixed gas from the front end of the reduction furnace;
and step four, adjusting the integral input quantity of the mixed gas and the proportion of hydrogen and nitrogen in the mixed gas in real time by detecting the state of the combustion flame until the temperature-variable oxidation-reduction integrated pretreatment process is completed.
In the invention, the front end of the oxidation reduction furnace is lower than the rear end, the hydrogen density is lower, the hydrogen can be ensured to be filled in the tube all the time, and the nitrogen mainly ensures positive pressure and air displacement in the tube and does not participate in the reduction reaction.
The redox method hot galvanizing and zinc alloy coating steel wire technology has the advantages of energy conservation and emission reduction, and (1) the redox method production technology cancels a large amount of chemical solvents such as acid, alkali and salt used in the pretreatment process of a solvent method, thereby realizing green production. (2) In the production process of the redox method, the waste heat of the steel wire heat treatment is fully utilized, and the energy consumption of the hot galvanizing and zinc-aluminum alloy furnace working procedures is greatly reduced. (3) Compared with the solvent method, the production technology of the redox method cancels the dependence of the solvent on water and greatly reduces the water consumption for production.
Preferably, in the first step, the hydrogen content in the hydrogen-nitrogen mixed gas is introduced into the redox furnace to be more than or equal to 25%, and the oxidation layer on the surface layer of the steel wire is reduced into pure iron which improves the bonding degree of the plating layer and the steel matrix. Introducing hydrogen-nitrogen mixed gas into the redox furnace, wherein the hydrogen content is more than 25%, and reducing the oxide layer on the surface layer of the steel wire into pure iron so as to improve the bonding degree of the plating layer and the steel matrix.
Preferably, the temperature of a high-temperature section for heating in a segmented manner in the redox furnace is more than 1000 ℃, and the temperature of a constant-temperature section for heating in the redox furnace is 700-800 ℃. The invention adjusts the amount of the mixed gas and the proportion of the hydrogen by detecting the size or the color of the combustion flame; thereby realizing constant temperature and high temperature control.
Preferably, in the process of discharging the hydrogen-nitrogen mixed gas from the tail input front end, unreduced hydrogen in the hydrogen-nitrogen mixed gas and oxygen at the front end are mixed and combusted to form water vapor for reducing environmental pollution. The mixed gas enters from the tail part and comes out from the front end, and the unreduced hydrogen and the oxygen at the feed end are mixed and combusted to form water vapor, so that the environmental pollution can be eliminated.
The temperature-variable oxidation-reduction integrated pretreatment device comprises an oxidation reduction furnace and a hydrogen-nitrogen mixed gas aerating device, wherein the oxidation reduction furnace comprises a reaction tube, a hearth is arranged on the outer side of the reaction tube, the reaction tube is communicated with the hydrogen-nitrogen mixed gas aerating device, the inner side of the reaction tube is filled with the hydrogen-nitrogen mixed gas, the height of the front end of the reaction tube, which is fed into a steel wire, is lower than that of the rear end of the reaction tube, a gas nozzle or an electric heater is arranged in a cavity between the inner side of the hearth and the outer side of the reaction tube, the oxidation reduction furnace is divided into a high-temperature section and a constant-temperature section, and a gas flowmeter is configured on the hydrogen-nitrogen mixed gas aerating device. The invention improves the efficiency of heating the steel wire by heating the oxidation reduction furnace in sections in a mode of comprising a high-temperature section (more than 1000 ℃) and a constant-temperature section (700 ℃ and 800 ℃). Most of steel wire paying-off modules usually have active and passive paying-off modes, two basic structural modes of a wire paying-off rack and a spool paying-off machine can be selected according to different product characteristics, the steel wire paying-off rack and the spool paying-off machine are selected according to the characteristics of the steel wire, the steel wire is sent into a reaction tube, and then the steel wire is processed according to a temperature-variable oxidation-reduction integrated pretreatment process; in the invention, hydrogen-nitrogen mixed gas enters from the tail part and comes out from the front end, and unreduced hydrogen and oxygen at the feed end are mixed and combusted to form water vapor so as to eliminate environmental pollution; the front end of the reduction furnace is lower than the rear end, the hydrogen density is lower, the hydrogen is always filled in the tube, and the nitrogen mainly ensures positive pressure and air displacement in the tube and does not participate in the reduction reaction; the steel wire is in the tube to perform reduction reaction, a gas nozzle or an electric heater is arranged between the outside of the tube and the inner wall of the furnace from top to bottom to heat the outer wall of the tube, a plurality of densely distributed nozzles or electric heaters are arranged in the high-temperature section to quickly heat, and only a few nozzles or electric heaters are arranged in the constant-temperature section to supplement heating.
Preferably, the oxidation reduction furnace is provided with at least one observation window for observing the size or color of the combustion flame of the gas burner.
Preferably, a gap exists between the high-temperature furnace and the constant-temperature furnace. The length of the gap is 1/3 at most the length of the constant temperature section, the constant temperature section and the high temperature section can be isolated through the gap, and the problem of poor temperature control caused by temperature conduction between the constant temperature section and the high temperature section is prevented.
Preferably, the length of the reaction tube is in the range of 12 to 50 meters. If the length of the steel wire is too long, the steel wire hangs and droops, and the steel wire is easy to rub the inner wall of the pipe; if the temperature is too short, the temperature is not uniformly raised, and the reduction effect is poor.
Preferably, the system further comprises a hydrogen-nitrogen mixed gas supply device, wherein a mixed gas valve for controlling the flow of the hydrogen-nitrogen mixed gas is arranged on the hydrogen-nitrogen mixed gas inflation device, each inflation nozzle is communicated with a gas distributor through a corresponding branch pipe, the gas distributor is communicated with a main pipe, the main pipe is provided with a mixed gas valve for controlling the flow, and the mixed gas valve is an electromagnetic regulating valve. The invention adopts the mixed gas valve to control the flow of the gas filled in, and the pressure balance in the pipe is ensured through the mixed gas valve. Furthermore, the hydrogen content in the pipe is ensured to exceed 25 percent by adopting a mode of independently controlling the hydrogen input and the nitrogen input through independent input control.
Preferably, the gas burner further comprises high-temperature auxiliary nozzles or electric heaters arranged in the high-temperature section and constant-temperature auxiliary nozzles or electric heaters arranged in the constant-temperature section, the number of the high-temperature auxiliary nozzles or electric heaters is less than that of the high-temperature nozzles or electric heaters, all the high-temperature auxiliary nozzles or electric heaters are arranged in the high-temperature nozzles or electric heaters at intervals, the number of the constant-temperature auxiliary nozzles or electric heaters is less than that of the constant-temperature nozzles or electric heaters, all the constant-temperature auxiliary nozzles or electric heaters are arranged in the constant-temperature nozzles or electric heaters at intervals, the high-temperature auxiliary nozzles are communicated with a gas supply device through a high-temperature auxiliary pipe, the constant-temperature auxiliary nozzles are communicated with the gas supply device through a constant-temperature auxiliary pipe, and the high-temperature auxiliary pipe and the constant-temperature auxiliary pipe are respectively provided. The invention adopts the design of the high-temperature auxiliary pipe and the constant-temperature auxiliary pipe, the temperature regulation in the processing state generally only regulates the gas quantity entering the high-temperature auxiliary pipe and the constant-temperature auxiliary pipe, but not regulates the gas quantity entering the high-temperature pipe and the constant-temperature pipe, the regulation amplitude is small, the fine regulation is realized, and the effect of quick response can be achieved.
The substantial effects of the invention are as follows: the redox hot-dip galvanizing and zinc alloy coating steel wire technology has the advantages of energy conservation and emission reduction, and (1) the redox production technology cancels a large amount of chemical solvents such as acid, alkali and salt used in the pretreatment process of a solvent method, thereby realizing green production. (2) In the production process of the redox method, the waste heat of the steel wire heat treatment is fully utilized, and the energy consumption of the hot galvanizing and zinc-aluminum alloy furnace working procedures is greatly reduced. (3) Compared with the solvent method, the production technology of the redox method cancels the dependence of the solvent on water and greatly reduces the water consumption for production.
Drawings
FIG. 1 is a schematic view of an oxidation reduction furnace of example 1;
FIG. 2 is a schematic view of a reaction tube in example 1;
FIG. 3 is a schematic view of a reaction tube in example 2;
FIG. 4 is a line drawing for practical use in example 1;
in the figure: 1. the device comprises an oxidation reduction furnace, 2, a reaction tube, 3, a gas nozzle, 4, a gap, 5, a steel wire, 6, hydrogen-nitrogen mixed gas, 7, an observation window, 8, a gas valve, 9, a mixed gas valve, 11, a high-temperature section, 12, a high-temperature tube, 13, a high-temperature auxiliary tube, 21, a constant-temperature section, 22, a constant-temperature tube, 23, a constant-temperature auxiliary tube, 31, a hydrogen-nitrogen mixed gas charging device, 32 and a gas supply device.
Detailed Description
The technical solution of the present embodiment is further specifically described below by way of specific examples.
Example 1:
a temperature-variable oxidation-reduction integrated pretreatment process is used for treatment in an oxidation reduction furnace 1, the front end height of a steel wire 5 fed into the oxidation reduction furnace is lower than the rear end height, and the process comprises the following steps:
step one, introducing a hydrogen-nitrogen mixed gas 6 into an oxidation reduction furnace, more specifically introducing the hydrogen-nitrogen mixed gas into a reaction tube, and reducing an oxide layer on the surface layer of the steel wire into pure iron; in the first step, the hydrogen content in the hydrogen-nitrogen mixed gas is introduced into the redox furnace to be more than or equal to 25 percent, and the oxide layer on the surface layer of the steel wire is reduced into pure iron which improves the bonding degree of the coating and the steel matrix. Introducing hydrogen-nitrogen mixed gas into the redox furnace, wherein the hydrogen content is more than 25%, and reducing an oxide layer on the surface layer of the steel wire into pure iron so as to improve the bonding degree of the plating layer and the steel matrix.
Step two, the front section of the oxidation reduction furnace is an oxidation working section, and the rear section of the oxidation reduction furnace is a reduction working section by heating the high temperature section 11 and the constant temperature section 21 in a segmented manner; the temperature of a high-temperature section for sectional heating in the redox furnace is more than 1000 ℃, and the temperature of a constant-temperature section for redox heating is 700-800 ℃. Inputting hydrogen-nitrogen mixed gas from the tail of the reduction furnace, and discharging the hydrogen-nitrogen mixed gas from the front end of the reduction furnace; the front end of the oxidation reduction furnace is lower than the rear end, the hydrogen density is low, the hydrogen can be always filled in the tube, and the nitrogen mainly ensures positive pressure and air displacement in the tube and does not participate in reduction reaction. In the process that the hydrogen-nitrogen mixed gas is input from the tail part and discharged from the front end, unreduced hydrogen in the hydrogen-nitrogen mixed gas and oxygen at the front end are mixed and combusted to form water vapor for reducing environmental pollution. The mixed gas of hydrogen and nitrogen enters from the tail part and comes out from the front end, and the unreduced hydrogen and the oxygen at the feed end are mixed and combusted to form water vapor, so that the environmental pollution can be eliminated.
And step four, adjusting the integral input quantity of the mixed gas and the proportion of hydrogen in the mixed gas in real time by detecting the state of the combustion flame until the temperature-variable oxidation-reduction integrated pretreatment process is completed. The embodiment adjusts the amount of the mixed gas and the hydrogen ratio by detecting the size or the color of the combustion flame; thereby realizing constant temperature and high temperature control.
The redox method hot galvanizing and zinc-aluminum alloy coating steel wire technology has the advantages of energy conservation and emission reduction, and (1) the redox method production technology cancels a large amount of chemical solvents such as acid, alkali and salt used in the pretreatment process of a solvent method, thereby realizing green production. (2) In the production process of the redox method, the waste heat of the steel wire heat treatment is fully utilized, and the energy consumption of the hot galvanizing and zinc-aluminum alloy furnace working procedures is greatly reduced. (3) Compared with the solvent method, the production technology of the redox method cancels the dependence of the solvent on water and greatly reduces the water consumption for production.
A temperature-variable oxidation-reduction integrated pretreatment device (see attached figures 1, 2 and 4) is used for executing a temperature-variable oxidation-reduction integrated pretreatment process and comprises an oxidation-reduction furnace and a hydrogen-nitrogen mixed gas aerating device 31, wherein the oxidation-reduction furnace comprises a reaction tube 2, a hearth is arranged on the outer side of the reaction tube, the reaction tube is communicated with the hydrogen-nitrogen mixed gas aerating device, hydrogen-nitrogen mixed gas is filled in the inner side of the reaction tube, a steel wire to be processed penetrates through the reaction tube, the height of the front end of the steel wire fed into the reaction tube is lower than that of the rear end of the steel wire, a gas nozzle 3 is arranged in a cavity on the inner side of the hearth and on the outer side of the reaction tube, the oxidation-reduction furnace is divided into a high-temperature section and a constant-temperature section, furthermore, the number of high-temperature gas nozzles arranged in a unit volume corresponding to the high-temperature section in the gas nozzle can be larger than the number of constant-, the hydrogen-nitrogen mixed gas aerating device is provided with a gas flowmeter. In the embodiment, the efficiency of heating the steel wire is improved by heating the reduction furnace in sections in a mode of comprising a high-temperature section (above 1000 ℃) and a constant-temperature section (700-800 ℃). Most of steel wire paying-off modules generally have active and passive paying-off modes, two basic structural modes of a wire paying-off rack and a spool paying-off machine can be selected according to different product characteristics, steel wires are sent into a reaction tube according to the characteristics of the steel wires, then the steel wires are processed according to the temperature-variable oxidation-reduction integrated pretreatment process, in the embodiment, hydrogen-nitrogen mixed gas enters from the tail part and exits from the front end, and unreduced hydrogen and oxygen at the feeding end are mixed and combusted to form water vapor so as to eliminate environmental pollution; the front end of the reduction furnace is lower than the rear end, the hydrogen density is lower, the hydrogen can be ensured to be filled in the tube all the time, and the nitrogen mainly ensures positive pressure and air displacement in the tube and does not participate in the reduction reaction; the steel wire carries out reduction reaction in intraductal, and between the outside of tubes and the stove inner wall, sets up gas nozzle from top to bottom, heats the geminate transistors outer wall, and the high temperature section has a plurality of nozzles of densely covered, can heat fast, and then only has a few nozzles in the constant temperature section for supplementary heating.
And the oxidation reduction furnace is provided with at least one observation window 7 for observing the size or color of combustion flame of the gas nozzle. And a gap 4 exists between the high-temperature section hearth and the constant-temperature section hearth. The length of the gap is 1/3 at most the length of the constant temperature section, the constant temperature section and the high temperature section can be isolated through the gap, and the problem of poor temperature control caused by temperature conduction between the constant temperature section and the high temperature section is prevented. The length of the reaction tube ranges from 12 meters to 50 meters. If the length of the steel wire is too long, the steel wire hangs and droops, and the steel wire is easy to rub the inner wall of the pipe; if the temperature is too short, the temperature is not uniformly raised, and the reduction effect is poor.
Example 2:
the present embodiment is substantially the same as embodiment 1, except that in the present embodiment (see fig. 3), a gas supply device 32 is further included, a mixed gas valve 9 for controlling the flow rate of the hydrogen-nitrogen mixed gas is configured on the hydrogen-nitrogen mixed gas inflator, each gas nozzle is communicated with a gas main pipe through a corresponding gas branch pipe, the gas main pipe is communicated with the gas supply device, a gas valve 8 for controlling the flow rate of the gas is configured on the gas main pipe, and the mixed gas valve and the gas valve are both electromagnetic regulating valves. The embodiment adopts the mixed gas valve to control the flow of the filled gas, ensures the balance of the pressure in the pipe through the mixed gas valve, further can independently adopt the mode of independently controlling the input of hydrogen and the input of nitrogen, and ensures that the content of the hydrogen in the pipe exceeds 25 percent through independent input control. In this embodiment, still including the high temperature auxiliary nozzle of configuration in the high temperature section and the constant temperature auxiliary nozzle who sets up in the constant temperature section, the quantity of high temperature auxiliary nozzle is less than the quantity of high temperature nozzle, and all high temperature auxiliary nozzle intervals are arranged in the high temperature nozzle, the quantity of constant temperature auxiliary nozzle is less than the quantity of constant temperature nozzle, and all constant temperature auxiliary nozzle intervals are arranged in the constant temperature nozzle, high temperature auxiliary nozzle passes through high temperature auxiliary pipe 13 and gas air feeder intercommunication, constant temperature auxiliary nozzle passes through constant temperature auxiliary pipe 23 and gas air feeder intercommunication, be provided with corresponding electromagnetic control valve on high temperature auxiliary pipe and the constant temperature auxiliary pipe respectively. The design of high temperature auxiliary tube and constant temperature auxiliary tube has been adopted in this embodiment, and temperature regulation under the processing state generally only adjusts the gas volume that gets into in high temperature auxiliary tube and the constant temperature auxiliary tube, and does not adjust the entering gas volume of high temperature pipe 12 and constant temperature pipe 22, and the range of regulation is less, belongs to the fine setting, can play the effect of quick response.
Example 3:
the present embodiment is substantially the same as embodiment 2, except that in this embodiment, an upper computer acquires the shape and color of the flame in the gas nozzle from an observation window in a camera acquisition manner, in this embodiment, the observation window is only aligned with the thermostatic nozzle and the high-temperature nozzle, and is also aligned with the thermostatic auxiliary nozzle and the high-temperature auxiliary nozzle, in this embodiment, the gas valves corresponding to the thermostatic nozzle and the high-temperature nozzle are electromagnetic regulating valves with fixed opening degrees in a normal state, i.e., the opening degrees of the gas valves corresponding to the thermostatic nozzle and the high-temperature nozzle are not generally regulated, while controllers of the thermostatic auxiliary nozzle and the high-temperature auxiliary nozzle are controlled by a field single chip microcomputer, the single chip microcomputer is in communication connection with the upper computer, the upper computer may be an industrial personal computer, the upper computer analyzes the working state of the gas nozzle according to the information acquired by the camera, and after the analysis, if the high-temperature section or the thermostatic section needs to be strengthened, the opening degree of the constant-temperature auxiliary nozzle and the opening degree of the high-temperature auxiliary nozzle are increased under the driving of the single chip microcomputer, so that gas supply is improved, and further adjustment of the gas nozzle is finally achieved. If the high-temperature section or the constant-temperature section needs weakening, the upper computer sends a control command to the single chip microcomputer, and the single chip microcomputer drives the constant-temperature auxiliary nozzle and the high-temperature auxiliary nozzle to reduce the opening degree, so that gas supply is reduced, and further adjustment of the gas nozzle is finally achieved. Closed-loop control is realized through the gas nozzle, the upper computer, the singlechip and the camera. Furthermore, in this embodiment, because the design of the industrial personal computer is adopted, the gas nozzle can adopt a burner with a controllable proportion, and simultaneously output gas and air/oxygen, when a closed loop is formed by detecting the combustion condition, the output gas is kept to be fully combusted under the condition that the oxygen is sufficient, and simultaneously the oxygen content is controlled not to be excessive according to the combustion condition, otherwise, the oxygen input is excessive, so that the oxidation of various components and equipment in the furnace is accelerated. On the basis, a device capable of detecting the oxygen content can be selectively added into the furnace, so that the oxygen content is controlled, and the micro-oxidation environment is achieved.
The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.
Claims (10)
1. A temperature-variable oxidation-reduction integrated pretreatment process is characterized in that: the method is characterized in that pretreatment is carried out in an oxidation reduction furnace, the front end height of a steel wire fed into the oxidation reduction furnace is lower than the rear end height, and the method comprises the following steps:
step one, introducing hydrogen-nitrogen mixed gas into an oxidation reduction furnace to reduce an oxide layer on the surface layer of the steel wire into pure iron;
step two, the front section of the oxidation reduction furnace is an oxidation working section, and the rear section of the oxidation reduction furnace is a reduction working section by heating the oxidation reduction furnace in a high-temperature section and a constant-temperature section in a segmented manner;
inputting hydrogen-nitrogen mixed gas from the tail of the reduction furnace, and discharging the hydrogen-nitrogen mixed gas from the front end of the reduction furnace;
and step four, adjusting the integral input quantity of the mixed gas and the proportion of hydrogen and nitrogen in the mixed gas in real time by detecting the state of the combustion flame until the temperature-variable oxidation-reduction integrated pretreatment process is completed.
2. The temperature-variable oxidation-reduction integrated pretreatment process according to claim 1, characterized in that: in the first step, the hydrogen content in the hydrogen-nitrogen mixed gas is introduced into the redox furnace to be more than or equal to 25 percent, and the oxide layer on the surface layer of the steel wire is reduced into pure iron which improves the bonding degree of the coating and the steel matrix.
3. The temperature-variable oxidation-reduction integrated pretreatment process according to claim 1, characterized in that: the temperature of a high-temperature section for sectional heating in the redox furnace is more than 1000 ℃, and the temperature of a constant-temperature section for redox heating is 700-800 ℃.
4. The temperature-variable oxidation-reduction integrated pretreatment process according to claim 1, characterized in that: in the process that the hydrogen-nitrogen mixed gas is input from the tail part and discharged from the front end, unreduced hydrogen in the hydrogen-nitrogen mixed gas and oxygen at the front end are mixed and combusted to form water vapor for reducing environmental pollution.
5. A temperature-variable oxidation-reduction integrated pretreatment device is used for executing a temperature-variable oxidation-reduction integrated pretreatment process, and is characterized in that: the device comprises an oxidation reduction furnace and a hydrogen-nitrogen mixed gas aerating device, wherein the oxidation reduction furnace comprises a reaction tube, a hearth is arranged on the outer side of the reaction tube, the reaction tube is communicated with the hydrogen-nitrogen mixed gas aerating device, the inner side of the reaction tube is filled with the hydrogen-nitrogen mixed gas, the height of the front end of the reaction tube, which is fed into a steel wire, is lower than that of the rear end of the reaction tube, a gas nozzle or an electric heater is arranged in a cavity between the inner side of the hearth and the outer side of the reaction tube, the front and the rear of the oxidation reduction furnace are divided into a high-temperature section and a.
6. The temperature-variable oxidation-reduction integrated pretreatment apparatus according to claim 5, characterized in that: and at least one observation window for observing the size or color of combustion flame of the gas nozzle is arranged on the oxidation reduction furnace.
7. The temperature-variable oxidation-reduction integrated pretreatment apparatus according to claim 5, characterized in that: and a gap is formed between the high-temperature section hearth and the constant-temperature section hearth.
8. The temperature-variable oxidation-reduction integrated pretreatment apparatus according to claim 5, characterized in that: the length of the reaction tube ranges from 12 meters to 50 meters.
9. The temperature-variable oxidation-reduction integrated pretreatment apparatus according to claim 5, characterized in that: still including hydrogen nitrogen mist gas supply unit, dispose the mist valve that is used for controlling hydrogen nitrogen mist gas flow on the hydrogen nitrogen mist gas charging device, every aerating nozzle all communicates with gas distributor through a branch pipe that corresponds, gas distributor and house steward intercommunication, the mist valve that disposes control flow on the house steward, the mist valve is electromagnetic control valve.
10. The temperature-variable oxidation-reduction integrated pretreatment apparatus according to claim 5, characterized in that: the high-temperature auxiliary nozzle or the electric heater is arranged in the high-temperature section, the constant-temperature auxiliary nozzle or the electric heater is arranged in the constant-temperature section at intervals, the constant-temperature auxiliary nozzle or the electric heater is less than the constant-temperature nozzle or the electric heater, all the constant-temperature auxiliary nozzles or the electric heater are arranged in the constant-temperature nozzle or the electric heater at intervals, the high-temperature auxiliary nozzle is communicated with the gas supply device through the high-temperature auxiliary pipe, the constant-temperature auxiliary nozzle is communicated with the gas supply device through the constant-temperature auxiliary pipe, and the corresponding electromagnetic adjusting valves are respectively arranged on the high-temperature auxiliary pipe and the constant-temperature auxiliary pipe.
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