CN216237182U - Annealing stove waste heat utilization and air purification system - Google Patents
Annealing stove waste heat utilization and air purification system Download PDFInfo
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- CN216237182U CN216237182U CN202122495850.1U CN202122495850U CN216237182U CN 216237182 U CN216237182 U CN 216237182U CN 202122495850 U CN202122495850 U CN 202122495850U CN 216237182 U CN216237182 U CN 216237182U
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Abstract
The utility model provides an annealing furnace waste heat utilization and air purification system. The technical scheme adopts an improved annealing furnace for operation, the improved annealing furnace is newly added with a waste heat utilization heat exchanger, and the foil can be recovered when the annealing is finished and the temperature begins to be reducedHeat is used for heating the foil; meanwhile, the tail end of the annealing furnace is additionally provided with a heat pipe heat exchanger, so that exhaust heat can be fully recovered. In addition, the utility model designs a rolling oil recovery device based on a molecular sieve concentration rotating wheel, rolling oil in the air passes through the concentration rotating wheel, and after the concentration reaches a certain value, liquid rolling oil can be obtained through condensation, and meanwhile, the concentration of pollutants in exhaust gas is reduced. By applying the utility model, the concentration of VOCs in the exhaust gas is 500-1000 mg/m3Reduced to 30mg/m3The emission requirement is fully met; and the unit consumption of the double zero foil annealing is reduced by more than 30 percent from 300 yuan/ton. The utility model fully realizes the energy conservation and emission reduction of the copper foil and aluminum foil annealing furnace and has outstanding technical advantages.
Description
Technical Field
The utility model relates to the field of processing of nonferrous metals including copper foils and aluminum foils, in particular to an annealing furnace waste heat utilization and air purification system.
Background
The copper foil and the aluminum foil are processed by a cold rolling process, and the copper foil or the aluminum foil needs to be cooled by rolling oil when the copper foil and the aluminum foil are rolled, so that a certain amount of rolling oil is remained on the surfaces of the rolled copper foil and the rolled aluminum foil. The residual of the rolling oil on the surface of the foil is usually 0.02 to 0.2 microns, the residual of the rolling oil per square meter is 16 to 160mg according to the calculation of a 0.007mm aluminum foil, and the oil content of each ton of the foil is 0.5 to 5 kilograms.
After foil rolling, the material needs to be annealed in order to improve the mechanical properties of the material and remove the residual rolling oil on the surface of the foil. Annealing is currently typically performed in a box annealing furnace. The annealing temperature is usually between 180 and 300 ℃. The operating temperature profile of the annealing furnace is shown in FIG. 1.
After entering the furnace, the foil is slowly heated to 180-300 ℃, and then is subjected to heat preservation and oil removal. If the foil lattice reforming is needed, the temperature needs to be further increased, and the furnace temperature is reduced to the normal temperature after the temperature is kept for a period of time.
The existing foil annealing furnace has the following problems: (1) the distillation range of the rolling oil remained on the foil is 235-275 ℃, the rolling oil can volatilize in the annealing process, and in order to ensure that the concentration of the solvent in the annealing furnace is in a safe range, the annealing furnace needs to exhaust air and supplement fresh air. Thus, the existing annealing furnace has two defects, firstly, the exhaust gas causes a great amount of heat loss, the patent CN207121631U proposes a method for recovering heat by using a heat exchanger to save the energy consumption of the annealing furnace, however, the patent does not propose concrete implementation measures, and particularly the patent does not clarify the structure of the heat exchanger; secondly, the exhaust gas contains rolling oil which is a non-environment-friendly substance, and enterprises producing 10 ten thousand tons of double-zero aluminum foil annually can discharge about 100-500 tons of rolling oil to the atmosphere every year. Calculating according to the yield of 360 ten thousand tons of Chinese aluminum foil, and discharging 3.6-18 ten thousand tons of rolling oil to the atmosphere every year by the aluminum foil annealing process; (2) when the aluminum foil is annealed, the main energy consumption is used for heating the aluminum foil, the aluminum heating consumes more than 50 percent of energy consumption, and the heat absorbed by the foil is directly discharged to the atmosphere when the aluminum foil is annealed and cooled at present.
Disclosure of Invention
The utility model aims to provide an annealing furnace waste heat utilization and air purification system aiming at the technical defects of the prior art so as to solve the technical problem that the conventional foil annealing furnace cannot fully utilize the exhaust waste heat.
The utility model also aims to solve the technical problem of reducing the rolling oil content in the exhaust gas of the foil annealing furnace.
In order to achieve the technical purpose, the utility model adopts the following technical scheme:
the annealing furnace waste heat utilization and air purification system comprises a rolling oil recovery device and an improved annealing furnace, wherein a waste heat utilization heat exchanger is arranged in the improved annealing furnace, and a heat pipe heat exchanger is arranged at an exhaust end of the improved annealing furnace.
Preferably, the heat pipe heat exchanger comprises a heat pipe shell, a liquid absorption core, heat exchange working medium steam and liquid working medium, wherein the liquid absorption core is positioned inside the heat pipe shell, the heat exchange working medium steam is arranged inside the liquid absorption core, and the liquid working medium is arranged outside the liquid absorption core.
Preferably, the heat pipe heat exchanger is divided into an evaporation section, a heat insulation section and an evaporation section in sequence along the axial direction of the heat pipe heat exchanger.
Preferably, the rolling oil recovery device comprises an air cooler, a rolling oil concentration rotating wheel, a processing fan, a regenerative heater, an air cooler and a regenerative fan, wherein the device comprises a main path and a regenerative path, the main path is sequentially provided with the air cooler and the processing fan, two ends of the regenerative path are respectively connected to the main path, two ends of the regenerative path are respectively located at the upstream and the downstream of the air cooler, the regenerative heater, the air cooler and the regenerative fan are sequentially arranged on the regenerative path, and the main path and the regenerative path respectively pass through the rolling oil concentration rotating wheel.
Preferably, the rolling oil concentration wheel is located between the air cooler and the process fan, while the rolling oil concentration wheel is located between the regenerative heater and the air cooler.
The utility model provides an annealing furnace waste heat utilization and air purification system. According to the technical scheme, the improved annealing furnace is adopted for operation, a waste heat utilization heat exchanger is newly added in the modified annealing furnace, and heat contained in the foil can be recovered when the annealing is finished and the temperature is reduced and is used for heating the foil; meanwhile, the tail end of the annealing furnace is additionally provided with a heat pipe heat exchanger, so that exhaust heat can be fully recovered. In addition, the utility model designs a rolling oil recovery device based on a molecular sieve concentration rotating wheel, rolling oil in the air passes through the concentration rotating wheel, and after the concentration reaches a certain value, liquid rolling oil can be obtained through condensation, and meanwhile, the concentration of pollutants in exhaust gas is reduced. By applying the utility model, the concentration of VOCs in the exhaust gas is 500-1000 mg/m3Reduced to 30mg/m3The emission requirement is fully met; and the unit consumption of the double zero foil annealing is reduced by more than 30 percent from 300 yuan/ton. The utility model fully realizes the energy conservation and emission reduction of the copper foil and aluminum foil annealing furnace and has outstanding technical advantages.
Drawings
FIG. 1 is a graph of annealing furnace operating temperature;
FIG. 2 is a schematic diagram of the operation of the heat pipe heat exchanger of the present invention;
FIG. 3 is a flowchart of the operation of the rolling oil recovery apparatus of the present invention;
FIG. 4 is a schematic view of a structure of a conventional annealing furnace viewed from a side view;
FIG. 5 is a schematic view of a structure of a conventional annealing furnace viewed from a forward direction;
FIG. 6 is a schematic structural view of a modified annealing furnace according to the present invention;
in the figure:
1. heat pipe shell 2, liquid absorption core 3 and heat exchange working medium steam
4. Liquid working medium 11, first air cooler 12 and rolling oil concentration runner
13. A processing fan 14, a regenerative heater 15, and a second air cooler
16. Regenerative fan 101, circulating fan motor 102, and circulating fan
103. Circulating air channel 104, heater 105 and annealing furnace return air inlet
106. Foil roll 107 to be annealed, annealing furnace door 108, and annealing furnace fresh air fan
109. Annealing furnace exhaust fan 110, circulating cooling water 111, annealing furnace cooling fan
112. A waste heat utilization heat exchanger 113 and a heat pipe heat exchanger.
Detailed Description
Hereinafter, specific embodiments of the present invention will be described in detail. Well-known structures or functions may not be described in detail in the following embodiments in order to avoid unnecessarily obscuring the details. Approximating language, as used herein in the following examples, may be applied to identify quantitative representations that could permissibly vary in number without resulting in a change in the basic function. Unless defined otherwise, technical and scientific terms used in the following examples have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
The annealing furnace waste heat utilization and air purification system comprises a rolling oil recovery device and an improved annealing furnace, wherein the structure of the improved annealing furnace is shown in FIG. 6, a waste heat utilization heat exchanger 112 is arranged in the improved annealing furnace, and a heat pipe heat exchanger 113 is arranged at the exhaust end of the improved annealing furnace.
The structure of the heat pipe heat exchanger 113 is as shown in fig. 2, and includes a heat pipe shell 1, a wick 2, heat exchange working medium vapor 3, and liquid working medium 4, wherein the wick 2 is located inside the heat pipe shell 1, the heat exchange working medium vapor 3 is provided inside the wick 2, and the liquid working medium 4 is provided outside the wick 2. The heat pipe heat exchanger 113 is sequentially divided into an evaporation section, a heat insulation section, and an evaporation section along the axial direction thereof.
The rolling oil recovery device has a structure as shown in fig. 3, and includes a first air cooler 11, a rolling oil concentration runner 12, a treatment fan 13, a regeneration heater 14, a second air cooler 15, and a regeneration fan 16, wherein the device includes a main path and a regeneration path, the main path is sequentially provided with the first air cooler 11 and the treatment fan 13, two ends of the regeneration path are respectively connected to the main path, two ends of the regeneration path are respectively located at the upstream and downstream of the first air cooler 11, the regeneration path is sequentially provided with the regeneration heater 14, the second air cooler 15, and the regeneration fan 16, and the main path and the regeneration path respectively pass through the rolling oil concentration runner 12. The rolling oil concentrating runner 12 is located between the first air cooler 11 and the treating fan 13, while the rolling oil concentrating runner 12 is located between the regenerative heater 14 and the second air cooler 15.
The technical advantages of the utility model are focused on the following aspects:
1. the heat pipe type heat exchanger is used for recovering exhaust heat.
The concentration of VOCs in the waste gas discharged by the annealing furnace is 500-1000 mg/m3When the fresh air of the feeding and discharging furnace is supplemented to exchange heat with the annealing furnace exhaust, the rolling oil in the exhaust gas can be condensed on the heat exchanger, therefore, the heat is recovered by utilizing the heat pipe heat exchanger, and the working principle diagram of the heat pipe heat exchanger can be seen in fig. 2.
The working medium at the evaporation section in the heat pipe is boiled or evaporated after being heated, the heat of an external heat source is absorbed, latent heat of vaporization is generated and is changed from liquid to steam, the generated steam flows to the condensation section under the action of a certain pressure difference in the pipe, the steam is condensed into liquid when meeting the cold wall surface and an external cold source and releases latent heat of vaporization at the same time and is transmitted to the external cold source through the pipe wall, and the condensate flows back to the evaporation section for re-evaporation under the action of the liquid absorption core. The heat transfer and exchange of the external cold and hot media are realized by reciprocating in this way.
When the waste gas containing the rolling oil flows through the heat pipe heat exchanger, the rolling oil is condensed and can smoothly flow out of the heat pipe heat exchanger.
The heat transfer temperature difference of the heat pipe can be within 10 ℃, and when the exhaust temperature of the annealing furnace is 200 ℃, the fresh air supplemented into the furnace can be heated to about 190 ℃.Taking a 10-ton annealing furnace as an example, the flow rate at the time of exhausting is 1700m3And the electric heating power which can be saved is 85KW when the exhaust temperature is 200 ℃.
2. Rolling oil recovery device based on molecular sieve concentration rotating wheel
The rolling oil belongs to a high boiling point solvent, and the solvent discharged by the annealing furnace can be recovered by utilizing a molecular sieve concentration rotating wheel.
The material capable of adsorbing organic substances in organic waste gas is manufactured into a honeycomb-structure disc rotating wheel, and the rotating speed of the molecular sieve rotating wheel is 1-3 revolutions per hour during normal work. The rotor is divided into 3 zones, namely a treatment zone, a cooling zone and a regeneration zone, during operation. The gas containing organic solvent is changed into relatively clean air after flowing through the treatment area, and the content of organic solvent can be reduced to 10mg/m3The environmental protection emission requirement of the people's republic of China is met. And part of the air containing the organic solvent is pushed by a regeneration fan to flow through the cooling zone and then heated to a certain temperature, and then flows through the regeneration zone of the rotating wheel, and the organic solvent adsorbed in the regeneration zone is desorbed and taken away by the regeneration air because the regeneration zone of the rotating wheel is heated by the regeneration air.
The rolling oil in the air passes through the concentration rotating wheel, and after the concentration reaches a certain value, the liquid rolling oil can be obtained through condensation, so that the concentration rotating wheel can recover the rolling oil from the air containing the rolling oil. The working principle of the rolling oil recovery device can be seen in fig. 3.
In fig. 3, the first air cooler 11 cools the exhaust gas containing the rolling oil with cooling water and chilled water to condense the rolling oil; the rolling oil concentration runner 12 makes the waste gas containing the rolling oil pass through the concentration runner for adsorption and purification; the treatment fan 13 makes the waste gas containing the rolling oil pass through the runner treatment area; the regenerative heater 14 heats the regenerative air of the oil-making concentration runner by using heat conduction oil or electricity; the second air cooler 15 is used for cooling the waste gas containing high-concentration rolling oil discharged from the runner regeneration zone to condense the rolling oil; the regeneration fan 16 causes the regeneration air to flow through the wheel regeneration zone and the regeneration air cooler.
3. The structure of the annealing furnace is improved
The structure principle of the traditional annealing furnace is shown in figures 4 and 5.
When the annealing furnace works, a circulating fan motor 101 and a circulating fan 102 are started (wherein the circulating fan motor 101 is used for driving fan blades to rotate, the circulating fan 102 enables hot air to circularly flow through foil to heat the foil), a heater 104 is started, the foil is heated according to a preset temperature heating program, and a fresh air fan 108 and an exhaust fan 109 of the annealing furnace are started according to a preset air concentration of rolling oil in the furnace.
When the foil needs to be cooled, the circulating cooling water 110 is switched on, and the annealing furnace cooling fan 111 is started.
The drawback of the known annealing furnaces is that the heat contained in the foil rolls is entirely removed by the circulating cooling water 110 and dissipated into the atmosphere.
The heat contained by the aluminum foil heating accounts for about 50% of the total heating heat of the annealing furnace, so that the heat dissipation of the circulating cooling water 110 accounts for 50% of the total heat of the annealing furnace, and the heat is recovered and used for heating the aluminum foil, so that the significance of reducing the energy consumption of the annealing furnace is realized.
The structure principle of the annealing furnace after the improvement of the utility model can be seen in figure 6. The improved annealing furnace is additionally provided with a waste heat utilization heat exchanger 112, and the device has the function of recovering heat contained in the foil when the annealing is finished and the temperature is reduced, and is used for heating the foil. And a heat pipe heat exchanger 113 (also called exhaust gas waste heat utilization heat exchanger) is additionally arranged at the tail end for recovering exhaust gas heat.
Experimental verification shows that after the method is implemented, the concentration of VOCs in the exhaust gas is 500-1000 mg/m at present3Reduced to 30mg/m3The emission requirement can be met. Meanwhile, the unit consumption of double zero foil annealing is reduced by more than 30 percent from 300 yuan per ton.
The embodiments of the present invention have been described in detail, but the description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model. Any modification, equivalent replacement, and improvement made within the scope of the application of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The system for utilizing the waste heat of the annealing furnace and purifying the air is characterized by comprising a rolling oil recovery device and an improved annealing furnace, wherein a waste heat utilization heat exchanger (112) is arranged in the improved annealing furnace, and a heat pipe heat exchanger (113) is arranged at the exhaust end of the improved annealing furnace.
2. The annealing furnace waste heat utilization and air purification system according to claim 1, characterized in that the heat pipe heat exchanger (113) comprises a heat pipe shell (1), a liquid absorbing core (2), heat exchange working medium vapor (3) and liquid working medium (4), wherein the liquid absorbing core (2) is located inside the heat pipe shell (1), the heat exchange working medium vapor (3) is located inside the liquid absorbing core (2), and the liquid working medium (4) is located outside the liquid absorbing core (2).
3. The annealing furnace waste heat utilization and air purification system according to claim 2, wherein the heat pipe heat exchanger (113) is sequentially divided into an evaporation section, a heat insulation section and an evaporation section along the axial direction.
4. The annealing furnace waste heat utilization and air purification system according to claim 1, the rolling oil recovery device comprises a first air cooler (11), a rolling oil concentration rotating wheel (12), a processing fan (13), a regenerative heater (14), a second air cooler (15) and a regenerative fan (16), wherein the device comprises a main path and a regeneration path, a first air cooler (11) and a processing fan (13) are arranged on the main path in sequence, both ends of the regeneration path are respectively connected to the main path, both ends of the regeneration path are respectively positioned at the upstream and downstream of the first air cooler (11), a regenerative heater (14), a second air cooler (15) and a regenerative fan (16) are arranged on the regenerative path in sequence, the main path and the regeneration path pass through a rolling oil concentration runner (12), respectively.
5. The annealing furnace waste heat utilization and air purification system according to claim 4, characterized in that the rolling oil concentration wheel (12) is located between the first air cooler (11) and the process fan (13), and at the same time, the rolling oil concentration wheel (12) is located between the regenerative heater (14) and the second air cooler (15).
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| CN113930602A (en) * | 2021-10-15 | 2022-01-14 | 广州黑马科技有限公司 | Annealing stove waste heat utilization and air purification system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113930602A (en) * | 2021-10-15 | 2022-01-14 | 广州黑马科技有限公司 | Annealing stove waste heat utilization and air purification system |
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