CN220304296U - Waste heat utilization system for roller hearth heat treatment furnace - Google Patents
Waste heat utilization system for roller hearth heat treatment furnace Download PDFInfo
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- CN220304296U CN220304296U CN202321982028.0U CN202321982028U CN220304296U CN 220304296 U CN220304296 U CN 220304296U CN 202321982028 U CN202321982028 U CN 202321982028U CN 220304296 U CN220304296 U CN 220304296U
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 72
- 239000002918 waste heat Substances 0.000 title claims abstract description 38
- 239000007789 gas Substances 0.000 claims abstract description 105
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 58
- 239000003546 flue gas Substances 0.000 claims abstract description 58
- 230000001681 protective effect Effects 0.000 claims abstract description 29
- 239000007921 spray Substances 0.000 claims abstract description 27
- 238000004064 recycling Methods 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 27
- 239000010959 steel Substances 0.000 claims description 27
- 239000000779 smoke Substances 0.000 claims description 4
- 239000000835 fiber Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 230000005855 radiation Effects 0.000 claims 1
- 238000003466 welding Methods 0.000 claims 1
- 239000002699 waste material Substances 0.000 abstract description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 230000000694 effects Effects 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 6
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 230000009471 action Effects 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 206010053615 Thermal burn Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
The utility model relates to a waste heat utilization system for a roller hearth heat treatment furnace, which is used for recycling heat in high-temperature flue gas of the roller hearth heat treatment furnace, and comprises: the heat exchange device is connected with a burner of the roller hearth heat treatment furnace, and low-temperature protective gas in the heat exchange device is heated through high-temperature flue gas generated by the burner so as to form high-temperature protective gas; and the preheating device is connected with the heat exchange device, and the heat exchange device conveys high-temperature protective gas to the preheating device and sprays the high-temperature protective gas to the outer surface of a workpiece in the preheating device so as to preheat the workpiece, and the low-temperature protective gas in the preheating device flows back to the heat exchange device. The utility model solves the technical problem that the heat in the flue gas cannot be recycled and the energy waste is caused by the roller hearth type heat treatment furnace.
Description
Technical Field
The utility model relates to the field of metallurgy, in particular to a waste heat utilization system for a roller hearth heat treatment furnace.
Background
In the metallurgical industry, a roller hearth heat treatment furnace is generally used to heat treat steel sheets. In order to improve the surface quality of the steel plate, a radiant tube is generally adopted for heating, and nitrogen is introduced into a heat treatment furnace as a shielding gas so as to ensure that the surface of the steel plate is not oxidized. The self preheating type burner is arranged in the radiant tube, and the temperature of the flue gas discharged by the preheating type burner in the working process is very high (limited by the self structure of the preheating type burner), the temperature of the flue gas is generally higher than 600 ℃, and the steel tube made of common carbon steel has poor high temperature capability, so that high temperature resistant steel has to be used for outputting the flue gas, thereby causing the increase of cost. In order to reduce the temperature of the flue gas, the flue gas can be conveyed by adopting a steel pipe made of common carbon steel, the conventional method is to open a flue gas outlet, introduce a large amount of cold air from the atmosphere under the action of a draught fan, cool the flue gas, generally reduce the temperature of the flue gas to below 200 ℃ by introducing the cold air, but the heat in the flue gas is difficult to recycle, so that the energy waste is caused.
For continuous industrial furnaces, a preheating device (or preheating zone) is generally provided to preheat the heated steel sheet, and then the heated steel sheet is fed into a heating zone, thereby achieving the effect of energy saving. However, as described above, after the flue gas is cooled, the temperature of the flue gas is low, and there is no recoverable value, so that the heat in the flue gas at the preheating device (or preheating zone) cannot be recycled, and the waste heat of the flue gas cannot be used for heating the steel plate.
Aiming at the problems that in the related art, the roller hearth heat treatment furnace cannot recycle heat in flue gas and causes energy waste, no effective solution is provided at present.
Accordingly, the present inventors have developed a waste heat utilization system for a roller hearth heat treatment furnace to overcome the drawbacks of the prior art, based on years of experience and practice in the relevant industry.
Disclosure of Invention
The utility model aims to provide a waste heat utilization system for a roller hearth heat treatment furnace, which can fully utilize heat in flue gas to preheat air and/or nitrogen for shielding gas, and the preheated air and/or nitrogen can be sprayed to the surface of a steel plate positioned in a preheating device at a high speed to perform injection forced convection heating on the steel plate, so that the temperature of the steel plate is increased, and the fuel consumption required by the roller hearth heat treatment furnace can be reduced, thereby achieving the effects of saving production cost and reducing carbon emission.
The object of the utility model can be achieved by the following scheme:
the utility model provides a waste heat utilization system for a roller hearth heat treatment furnace, which is used for recycling heat in high-temperature flue gas of the roller hearth heat treatment furnace, and comprises the following components:
the heat exchange device is connected with a burner of the roller hearth heat treatment furnace, and low-temperature protective gas in the heat exchange device is heated through high-temperature flue gas generated by the burner so as to form high-temperature protective gas;
the preheating device is connected with the heat exchange device, the heat exchange device conveys the high-temperature protection gas to the preheating device and sprays the high-temperature protection gas to the outer surface of a workpiece in the preheating device so as to preheat the workpiece, and the low-temperature protection gas in the preheating device flows back to the heat exchange device.
In a preferred embodiment of the present utility model, the heat exchange device is provided with at least a first flow channel and a second flow channel which are isolated, the heat exchange device is further provided with a first inlet, a second inlet, a first outlet and a second outlet, the first inlet and the first outlet are respectively connected with the first flow channel, the second inlet and the second outlet are respectively connected with the second flow channel, and the first flow channel is connected with a burner of the roller-hearth heat treatment furnace through the first inlet; the second flow passage is respectively connected with the protective gas inlet and the protective gas outlet of the preheating device through the second outlet and the second inlet.
In a preferred embodiment of the present utility model, a first pipe is connected between the first inlet and the burner of the roller hearth heat treatment furnace, and the high-temperature flue gas generated by the burner is conveyed to the first runner through the first pipe.
In a preferred embodiment of the present utility model, the first outlet is connected to a second pipe, and an induced draft fan is disposed on the second pipe or at the first outlet, so as to exhaust the low-temperature flue gas in the first flow channel through the second pipe and the induced draft fan.
In a preferred embodiment of the present utility model, a third pipeline is connected between the second outlet and the protecting gas inlet of the preheating device, and the high-temperature protecting gas in the heat exchanging device is conveyed to the preheating device through the third pipeline.
In a preferred embodiment of the present utility model, a circulating fan is disposed between the second inlet and the protecting gas outlet of the preheating device, the inlet of the circulating fan is connected with the second inlet through a fourth pipeline, and the outlet of the circulating fan is connected with the protecting gas outlet of the preheating device through a fifth pipeline, so as to convey the high-temperature protecting gas in the heat exchange device into the preheating device, and convey the low-temperature protecting gas in the preheating device into the second flow passage.
In a preferred embodiment of the present utility model, the exhaust port of the burner in the burner is in a closed state, so as to collect the high-temperature flue gas generated by the burner.
In a preferred embodiment of the present utility model, the preheating device includes a housing and a plurality of conveying rollers for conveying the workpiece, wherein an inner cavity is formed in the housing, at least a workpiece inlet and a workpiece outlet which are communicated with the inner cavity are formed on the housing, and the plurality of conveying rollers are arranged at intervals and extend from at least the workpiece inlet to the workpiece outlet through the inner cavity;
the inner cavity is internally provided with a plurality of nozzles, and the nozzles are used for spraying the high-temperature protection gas conveyed to the preheating device by the heat exchange device to the outer surface of a workpiece positioned on the conveying roller.
In a preferred embodiment of the present utility model, the conveying roller is located in the inner cavity, and two ends of the conveying roller are respectively and hermetically pivoted with the inner wall of the housing.
In a preferred embodiment of the present utility model, the preheating device further includes a plurality of first nozzles and a plurality of second nozzles, wherein the plurality of first nozzles are all located in the inner cavity and are arranged above the conveying roller at intervals, and the plurality of second nozzles are all located in the inner cavity and are arranged below the conveying roller at intervals;
the nozzle includes a plurality of first nozzles and a plurality of second nozzles, a plurality of first nozzles and a plurality of second nozzles set up respectively in a plurality of first spray tube and a plurality of second spray tube, and a plurality of first nozzles and a plurality of second nozzles all face the conveying roller sets up, so that will through a plurality of first nozzles high temperature protection gas sprays to the surface at work piece top, will through a plurality of second nozzles high temperature protection gas sprays to the surface at work piece bottom.
In a preferred embodiment of the present utility model, the plurality of first nozzles are arranged in a single row or multiple rows on the first nozzle, and when the plurality of first nozzles are arranged in multiple rows, two different rows are connected with each other, and a preset included angle is formed between the two connected first nozzles;
and/or the plurality of second nozzles are arranged in a single row or a plurality of rows on the second spray pipe, and when the plurality of second nozzles are arranged in a plurality of rows, two rows which are different are arranged, and a preset included angle is formed between two connected second nozzles.
In a preferred embodiment of the present utility model, the plurality of second nozzles are vertically offset from the plurality of conveying rollers, respectively.
In a preferred embodiment of the present utility model, the first nozzle and/or the second nozzle is a round pipe or a square pipe; the first nozzle and/or the second nozzle is a circular nozzle or a slit nozzle.
In a preferred embodiment of the present utility model, the vertical distance between the plurality of first nozzles and the upper part of the workpiece is greater than 50mm; the plurality of second nozzles are spaced from the lower portion of the workpiece by a vertical distance of 80mm to 120mm.
In a preferred embodiment of the present utility model, a shielding gas outlet for outputting the low-temperature shielding gas is provided at an upper portion of the housing;
the preheating device further comprises a first air box and a second air box, the first air box is connected with the plurality of first spray pipes respectively, the second air box is connected with the plurality of second spray pipes respectively, and the first air box and the second air box are provided with protective gas inlets respectively.
In a preferred embodiment of the present utility model, an inner liner layer is disposed on an inner wall of the housing, and the inner liner layer is used for reducing heat dissipation loss and avoiding excessive temperature of the housing.
In a preferred embodiment of the present utility model, at least part of the inner liner layer at the upper part is made of lightweight fiber, and at least part of the inner liner layer at the lower part is made of brickwork.
In a preferred embodiment of the present utility model, the housing is a steel structural housing, which is welded from various types of steel sections and/or plates.
From the above, the waste heat utilization system for the roller hearth heat treatment furnace has the characteristics and advantages that: the heat exchange device is connected with a burner of the roller hearth heat treatment furnace, the burner of the roller hearth heat treatment furnace generates high-temperature flue gas in the production process, and the high-temperature flue gas can be sent into the heat exchange device, so that the high-temperature flue gas heats low-temperature protection gas in the heat exchange device to form high-temperature protection gas; because the preheating device is connected with the heat exchange device, the high-temperature protection gas in the heat exchange device is sent into the preheating device and is sprayed to the outer surface of the workpiece in the preheating device, so that the workpiece can be preheated, the high-temperature protection gas can change the workpiece into the low-temperature protection gas after preheating heat loss heat, and the low-temperature protection gas can flow back to the heat exchange device for heating, so that the recovery and cyclic utilization of heat in high-temperature flue gas are realized, and the waste of energy sources is avoided. According to the utility model, the high-temperature flue gas is not required to be cooled by additionally introducing air, but the high-temperature flue gas is recovered and the low-temperature protective gas is heated by utilizing the heat of the high-temperature flue gas, so that the aim of preheating a workpiece is fulfilled, the temperature of the workpiece can be increased, and the fuel consumption required by the roller-hearth heat treatment furnace is reduced, so that the effects of saving the production cost and reducing the carbon emission are achieved.
Drawings
The following drawings are only for purposes of illustration and explanation of the present utility model and are not intended to limit the scope of the utility model. Wherein:
fig. 1: the utility model discloses a structural schematic diagram of a waste heat utilization system for a roller hearth heat treatment furnace.
Fig. 2: the utility model relates to a front cross-section view of a preheating device in a waste heat utilization system for a roller hearth heat treatment furnace.
Fig. 3: a side cross-sectional view of a preheating device in a waste heat utilization system for a roller hearth heat treatment furnace according to the present utility model.
The reference numerals in the utility model are:
1. a heat exchange device; 101. A first inlet;
102. a first outlet; 103. A second inlet;
104. a second outlet; 2. A preheating device;
201. a housing; 202. An inner cavity;
203. an inner liner layer; 204. A conveying roller;
205. a first nozzle; 2051. A first nozzle;
206. a second nozzle; 2061. A second nozzle;
207. a first bellows; 208. A second bellows;
209. a shielding gas outlet; 210. A workpiece inlet;
211. a workpiece outlet; 3. A burner;
4. an induced draft fan; 5. A circulating fan;
6. a first pipe; 7. A second pipe;
8. a third conduit; 9. A fourth conduit;
10. a fifth pipe; 11. A workpiece.
Detailed Description
For a clearer understanding of technical features, objects, and effects of the present utility model, a specific embodiment of the present utility model will be described with reference to the accompanying drawings.
As shown in fig. 1 to 3, the present utility model provides a waste heat utilization system for a roller hearth heat treatment furnace for recycling heat in high temperature flue gas of the roller hearth heat treatment furnace, the waste heat utilization system for the roller hearth heat treatment furnace comprising a heat exchanging device 1 and a preheating device 2, the heat exchanging device 1 being connected to a burner 3 of the roller hearth heat treatment furnace, the low temperature shielding gas in the heat exchanging device 1 being heated by the high temperature flue gas generated by the burner 3 of the roller hearth heat treatment furnace to form the high temperature shielding gas; the preheating device 2 is connected with the heat exchange device 1, the heat exchange device 1 conveys high-temperature protective gas to the preheating device 2 and sprays the high-temperature protective gas to the outer surface of the workpiece 11 in the preheating device 2 so as to preheat the workpiece 11, and the low-temperature protective gas in the preheating device 2 flows back to the heat exchange device 1.
In the utility model, the heat exchange device 1 is connected with the burner 3 of the roller hearth heat treatment furnace, the burner 3 of the roller hearth heat treatment furnace generates high-temperature flue gas in the production process, and the high-temperature flue gas can be sent into the heat exchange device 1, so that the high-temperature flue gas heats the low-temperature protective gas in the heat exchange device 1 (namely, the high-temperature flue gas exchanges heat with the low-temperature protective gas) to change the protective gas from the low-temperature protective gas into the high-temperature protective gas; because preheating device 2 links to each other with heat transfer device 1, the high temperature protection gas in the heat transfer device 1 is sent into preheating device 2 in to spray this high temperature protection gas to the surface of the work piece 11 in the preheating device 2, thereby can preheat work piece 11, become low temperature protection gas again after the high temperature protection gas preheats loss heat to work piece 11, the low temperature protection gas that this moment can flow back to heat transfer device 1 and heat up (because continuously send into high temperature flue gas into heat transfer device 1, low temperature protection gas can carry out heat transfer intensification with high temperature flue gas again), thereby realize the recovery and the cyclic utilization of heat in the high temperature flue gas, avoid the waste of the energy. According to the utility model, the high-temperature flue gas is not required to be cooled by additionally introducing air, but the high-temperature flue gas is recovered and the low-temperature protective gas is heated by utilizing the heat of the high-temperature flue gas, so that the aim of preheating the workpiece 11 is fulfilled, the temperature of the workpiece can be increased, and the fuel consumption required by the roller-hearth heat treatment furnace is reduced, so that the effects of saving the production cost and reducing the carbon emission are achieved.
In the present utility model, the shielding gas may be, but is not limited to, air and/or nitrogen.
In the present utility model, the workpiece 11 is a steel plate.
In an alternative embodiment of the utility model, the heat exchange device 1 may be a preheater or a heat exchanger. Specifically, at least a first flow passage (not shown) and a second flow passage (not shown) which are isolated towards each other are arranged in the heat exchange device 1, the heat exchange device 1 is further provided with a first inlet 101, a second inlet 103, a first outlet 102 and a second outlet 104, the first inlet 101 and the first outlet 102 are respectively connected with two ends of the first flow passage, the second inlet 103 and the second outlet 104 are respectively connected with two ends of the second flow passage, and the first flow passage is connected with the burner 3 of the roller hearth heat treatment furnace through the first inlet 101; the second flow channel is connected to the shielding gas inlet of the preheating device 2 via the second outlet 104 and to the shielding gas outlet 209 of the preheating device 2 via the second inlet 103.
Further, as shown in FIG. 1, a first pipe 6 (i.e., header pipe) is connected between the first inlet 101 and the burner 3 of the roller hearth heat treatment furnace, the high temperature flue gas generated by each burner 3 is collected into the first pipe 6, and the high temperature flue gas generated by the burner 3 is conveyed to the first flow path of the heat exchanging device 1 through the first pipe 6.
Further, as shown in fig. 1, the first outlet 102 is connected with the second pipeline 7, and the induced draft fan 4 is disposed on the second pipeline 7 or at the first outlet, and plays a role in driving gas to flow through the induced draft fan 4, so that low-temperature flue gas formed after heat exchange in the first flow channel is discharged through the second pipeline 7 and the induced draft fan 4.
Further, as shown in fig. 1, a third pipeline 8 is connected between the second outlet 104 and the protecting gas inlet of the preheating device 2, and the high-temperature protecting gas in the heat exchange device 1 is conveyed to the preheating device 2 through the third pipeline 8.
Further, as shown in fig. 1, a circulating fan 5 is disposed between the second inlet 103 and the protecting gas outlet 209 of the preheating device 2, the inlet of the circulating fan 5 is connected with the second inlet 103 through a fourth pipeline 9, the outlet of the circulating fan 5 is connected with the protecting gas outlet 209 of the preheating device 2 through a fifth pipeline 10, and the circulating fan 5 plays a role of driving gas to flow so as to convey the high-temperature protecting gas in the heat exchange device 1 into the preheating device 2 and convey the low-temperature protecting gas in the preheating device 2 into the second flow channel of the heat exchange device 1. Of course, the circulating fan 5 may also be disposed at the shielding gas outlet 209 or the second inlet of the preheating device 2, and may play a role in guiding the high-temperature shielding gas and the low-temperature shielding gas.
In the utility model, the exhaust port of the burner in the burner 3 is required to be sealed, so that the temperature reduction of high-temperature smoke caused by the entry of external air is avoided, and the high-temperature state of the high-temperature smoke is maintained. Therefore, the exhaust port of the burner in the present utility model is closed to collect the high temperature flue gas generated from the burner 3.
In an alternative embodiment of the present utility model, as shown in fig. 2 and 3, the preheating device 2 includes a housing 201 and a plurality of conveying rollers 204 for conveying the workpiece 11, an inner cavity 202 is formed in the housing 201, at least a workpiece inlet 210 and a workpiece outlet 211 communicating with the inner cavity 202 are formed on the housing 201, the workpiece inlet 210 and the workpiece outlet 211 are oppositely disposed on two opposite housing walls of the housing 201, the plurality of conveying rollers 204 are arranged at equal intervals, and the plurality of conveying rollers 204 extend from at least the workpiece inlet 210 to the workpiece outlet 211 through the inner cavity 202, and during operation, the workpiece 11 is located at the top of the conveying rollers 204, enters the inner cavity 202 from the workpiece inlet 210, and is preheated in the inner cavity 202 and then sent out from the workpiece outlet 211. The inner chamber 202 is provided therein with a plurality of nozzles for spraying the high-temperature shielding gas delivered from the heat exchanging apparatus 1 to the preheating apparatus 2 to the outer surface of the work 11 on the delivery roller 204, thereby achieving the purpose of preheating the work 11.
Further, as shown in fig. 2, the conveying roller 204 is a hollow roller, the conveying roller 204 is located in the inner cavity 202, and two ends of the conveying roller 204 are respectively and hermetically pivoted with the inner wall of the housing 201.
In an alternative embodiment of the present utility model, as shown in fig. 2 and 3, the preheating device 2 further includes a plurality of first nozzles 205 and a plurality of second nozzles 206, where the plurality of first nozzles 205 are located in the inner cavity 202 and are disposed above the conveying roller 204 at equal intervals, and the plurality of second nozzles 206 are located in the inner cavity 202 and are disposed below the conveying roller 204 at equal intervals; the nozzles include a plurality of first nozzles 2051 and a plurality of second nozzles 2061, the plurality of first nozzles 2051 are disposed on the first nozzle 205 at intervals along the extending direction of the first nozzle 205, the plurality of second nozzles 2061 are disposed on the second nozzle 206 at intervals along the extending direction of the second nozzle 206, and the plurality of first nozzles 2051 and the plurality of second nozzles 2061 are disposed toward the conveying roller 204 so as to spray the high-temperature shielding gas to the outer surface of the top of the workpiece 11 through the plurality of first nozzles 2051 and to spray the high-temperature shielding gas to the outer surface of the bottom of the workpiece 11 through the plurality of second nozzles 2061. The first nozzles 2051 and the second nozzles 2061 may be arranged vertically opposite to each other, or may be arranged vertically at a certain interval in a staggered manner, so as to ensure that the high-temperature shielding gas can be uniformly sprayed onto the outer surface of the workpiece 11.
In the present utility model, the preheating device 2 may be used as a preheating zone of the roller hearth heat treatment furnace and may be directly connected to the roller hearth heat treatment furnace. Of course, the preheating device 2 may be provided separately from the roll-hearth heat treatment furnace.
Further, the plurality of first nozzles 2051 may be arranged in a single row or in multiple rows on the first nozzle 205 (i.e. as shown in fig. 3, at least two first nozzles 2051 are disposed at one connection position of the first nozzle 205 in the circumferential direction), and when the plurality of first nozzles 2051 are arranged in multiple rows, two rows that are different from each other have a preset included angle between two connected first nozzles 2051; and/or, the plurality of second nozzles 2061 may be arranged in a single row or may be arranged in multiple rows on the second nozzle 206 (i.e., as shown in fig. 3, at least two second nozzles 2061 are disposed at one connection position of the second nozzle 206 in the circumferential direction), and when the plurality of second nozzles 2061 are arranged in multiple rows, two rows that are different from each other have a predetermined included angle between two connected second nozzles 2061. The specific arrangement of the first nozzles 2051 and the second nozzles 2061 may be adjusted according to the actual preheating effect of the workpiece 11, so as to ensure that the workpiece 11 can be heated uniformly. The preset included angle can be adjusted according to practical situations, and the specific angle is not limited herein.
Further, as shown in fig. 3, the plurality of second nozzles 2061 are vertically staggered from the plurality of conveying rollers 204, so that the high-temperature protection gas ejected from the second nozzles 2061 is prevented from being blocked by the conveying rollers 204, and the high-temperature protection gas can be smoothly ejected to the outer surface of the workpiece 11.
In this embodiment, the first nozzle 205 and/or the second nozzle 206 may be, but are not limited to, round or square tubes; the orifices of the first nozzles 2051 and/or the second nozzles 2061 may be, but are not limited to, circular orifices or slit-type orifices.
In the actual working process, the vertical distance between the first nozzles 2051 and the upper part of the workpiece 11 can be adjusted according to the thickness of the workpiece 11, so that the vertical distance between the first nozzles 2051 and the upper part of the workpiece 11 is ensured to be more than 50mm as much as possible; the plurality of second nozzles 2061 are spaced from the lower portion of the workpiece 11 by a vertical distance of 80mm to 120mm, wherein preferably the plurality of second nozzles 2061 are spaced from the lower portion of the workpiece 11 by a vertical distance of about 100mm. By limiting the vertical distance, it can be ensured that the high-temperature shielding gas injected by the first nozzle 2051 and the second nozzle 2061 can be uniformly dispersed and injected to the outer surface of the workpiece 11 to ensure uniform preheating of the workpiece 11.
In an alternative embodiment of the present utility model, as shown in fig. 2, a shielding gas outlet 209 for outputting a low-temperature shielding gas is provided at an upper portion of the housing 201, and the shielding gas outlet 209 communicates with the inner chamber 202; the preheating device 2 further comprises a first air box 207 and a second air box 208, the first air box 207 and the second air box 208 are both positioned outside the shell 201, the first air box 207 is positioned above the second air box 208, the first air box 207 is respectively connected with the plurality of first spray pipes 205, the second air box 208 is respectively connected with the plurality of second spray pipes 206, and the first air box 207 and the second air box 208 are respectively provided with a protective gas inlet. In the actual working process, the high-temperature protection gas sent out by the heat exchange device 1 enters the first air box 207 and the second air box 208 through the third pipeline 8, the high-temperature protection gas in the first air box 207 and the second air box 208 enters the first spray pipes 205 and the second spray pipes 206 respectively, and then is sprayed to the outer surface of the workpiece 11 through the first spray nozzles 2051 and the second spray nozzles 2061 respectively.
In an alternative embodiment of the present utility model, as shown in fig. 2 and 3, an inner liner 203 is disposed on an inner wall of the housing 201, and the inner liner 203 is used to reduce heat dissipation loss and prevent the housing 201 from being too hot to scald workers. Wherein, at least part of the upper lining layer 203 is made of light fiber, and at least part of the lower lining layer 203 is made of brickwork.
In an alternative embodiment of the present utility model, the housing 201 is a steel structural housing that is welded from various types of steel sections and/or plates to provide a secure, support and seal.
The working process of the utility model is as follows: in order to recover the waste heat of the high-temperature flue gas in the roller hearth heat treatment furnace, the exhaust port of the burner in the burner 3 of the roller hearth heat treatment furnace needs to be sealed first so that the high-temperature flue gas can be maintained in a high-temperature state. The high-temperature flue gas generated by each burner 3 is collected in a header, and the heat exchange device 1 is connected to the header, so that the low-temperature protective gas (air and/or nitrogen) in the heat exchange device 1 can be preheated through the high-temperature flue gas, the preheating temperature is generally higher than 300 ℃, and the low-temperature protective gas is heated to be high-temperature protective gas. The temperature of the high-temperature flue gas is reduced after passing through the heat exchange device 1, so that low-temperature flue gas is formed and discharged through the induced draft fan 4. The system is provided with a circulating fan 5, under the action of the circulating fan 5, high-temperature protection gas in the heat exchange device 1 enters the preheating device 2 and then is sprayed to the upper and lower outer surfaces of the steel plate at a high speed, the temperature of the steel plate can slowly rise under the actions of forced convection heat exchange and internal heat conduction of the steel plate, the temperature of the high-temperature protection gas after heat exchange can be reduced and changed into low-temperature protection gas again, and the low-temperature protection gas can reenter the heat exchange device 1 under the action of the circulating fan 5 and is heated through continuously fed high-temperature flue gas, so that the circulating flow of the protection gas in the system and the preheating of workpieces 11 are realized.
The waste heat utilization system for the roller hearth heat treatment furnace has the characteristics and advantages that:
1. in the waste heat utilization system for the roller hearth heat treatment furnace, the waste heat of high-temperature flue gas is utilized to preheat the steel plate, so that the heat absorption quantity of the steel plate in the furnace is reduced, the fuel consumption of the roller hearth heat treatment furnace can be effectively reduced, and the effects of saving the production cost and reducing the carbon emission are achieved;
2. in the waste heat utilization system for the roller hearth heat treatment furnace, the time of the steel plate in the furnace can be reduced by increasing the temperature of the steel plate entering the furnace under the condition that the length of the furnace is unchanged, so that the effect of increasing the yield of the roller hearth heat treatment furnace is achieved.
The foregoing is illustrative of the present utility model and is not to be construed as limiting the scope of the utility model. Any equivalent changes and modifications can be made by those skilled in the art without departing from the spirit and principles of this utility model, and are intended to be within the scope of this utility model.
Claims (18)
1. A waste heat utilization system for a roller hearth heat treatment furnace for recycling heat in high temperature flue gas of the roller hearth heat treatment furnace, the waste heat utilization system comprising:
the heat exchange device is connected with a burner of the roller hearth heat treatment furnace, and low-temperature protective gas in the heat exchange device is heated through high-temperature flue gas generated by the burner so as to form high-temperature protective gas;
the preheating device is connected with the heat exchange device, the heat exchange device conveys the high-temperature protection gas to the preheating device and sprays the high-temperature protection gas to the outer surface of a workpiece in the preheating device so as to preheat the workpiece, and the low-temperature protection gas in the preheating device flows back to the heat exchange device.
2. The waste heat utilization system for a roller hearth heat treatment furnace according to claim 1, wherein the heat exchanging device has at least a first flow path and a second flow path isolated therefrom, the heat exchanging device further has a first inlet, a second inlet, a first outlet, and a second outlet, the first inlet and the first outlet being connected to the first flow path, respectively, the second inlet and the second outlet being connected to the second flow path, respectively, the first flow path being connected to a burner of the roller hearth heat treatment furnace through the first inlet; the second flow passage is respectively connected with the protective gas inlet and the protective gas outlet of the preheating device through the second outlet and the second inlet.
3. The waste heat utilization system for a roller hearth heat treatment furnace according to claim 2, wherein a first pipe is connected between the first inlet and a burner of the roller hearth heat treatment furnace, and high-temperature flue gas generated by the burner is conveyed to the first flow path through the first pipe.
4. The waste heat utilization system for a roller hearth heat treatment furnace according to claim 2 or 3, wherein the first outlet is connected to a second pipe, and an induced draft fan is provided on or at the second pipe to discharge the low temperature flue gas in the first flow path through the second pipe and the induced draft fan.
5. The waste heat utilization system for a roller hearth heat treatment furnace according to claim 2, wherein a third pipe is connected between the second outlet and the shielding gas inlet of the preheating device, and the high-temperature shielding gas in the heat exchanging device is supplied to the preheating device through the third pipe.
6. The waste heat utilization system for roller hearth heat treatment furnace according to claim 2 or 5, wherein a fourth pipe is connected between the second inlet and the shielding gas outlet of the preheating device, and a circulating fan is provided on the fourth pipe or at the shielding gas outlet of the preheating device or at the second inlet to convey the high-temperature shielding gas in the heat exchange device into the preheating device and convey the low-temperature shielding gas in the preheating device into the second flow passage.
7. The waste heat utilization system for a roller hearth heat treatment furnace according to claim 1, wherein a smoke outlet of a burner in the burner is closed to collect high temperature smoke generated by the burner.
8. The waste heat utilization system for a roller hearth heat treatment furnace according to claim 1, wherein the preheating device comprises a housing and a plurality of conveying rollers for conveying a workpiece, an inner cavity is formed in the housing, at least a workpiece inlet and a workpiece outlet communicated with the inner cavity are formed in the housing, and the plurality of conveying rollers are arranged at intervals and extend from at least the workpiece inlet to the workpiece outlet through the inner cavity;
the inner cavity is internally provided with a plurality of nozzles, and the nozzles are used for spraying the high-temperature protection gas conveyed to the preheating device by the heat exchange device to the outer surface of a workpiece positioned on the conveying roller.
9. The waste heat utilization system for a roller hearth heat treatment furnace according to claim 8, wherein the conveying rollers in the inner chamber are hermetically pivoted at both ends thereof to the inner wall of the housing, respectively.
10. The waste heat utilization system for a roller hearth heat treatment furnace according to claim 8, wherein the preheating device further comprises a plurality of first nozzles and a plurality of second nozzles, wherein the plurality of first nozzles are all located in the inner chamber and are arranged above the conveying roller at intervals, and the plurality of second nozzles are all located in the inner chamber and are arranged below the conveying roller at intervals;
the nozzle includes a plurality of first nozzles and a plurality of second nozzles, a plurality of first nozzles and a plurality of second nozzles set up respectively in a plurality of first spray tube and a plurality of second spray tube, and a plurality of first nozzles and a plurality of second nozzles all face the conveying roller sets up, so that will through a plurality of first nozzles high temperature protection gas sprays to the surface at work piece top, will through a plurality of second nozzles high temperature protection gas sprays to the surface at work piece bottom.
11. The waste heat utilization system for a roller hearth heat treatment furnace according to claim 10, wherein the plurality of first nozzles are arranged in a single row or a plurality of rows on the first nozzle, and when the plurality of first nozzles are arranged in a plurality of rows, two rows which are different from each other are arranged, and a preset included angle is formed between two connected first nozzles;
and/or the plurality of second nozzles are arranged in a single row or a plurality of rows on the second spray pipe, and when the plurality of second nozzles are arranged in a plurality of rows, two rows which are different are arranged, and a preset included angle is formed between two connected second nozzles.
12. The waste heat utilization system for a roller hearth heat treatment furnace according to claim 10, wherein a plurality of the second nozzles are vertically offset from a plurality of the conveying rollers, respectively.
13. The waste heat utilization system for a roller hearth heat treatment furnace according to claim 10, wherein the first nozzle and/or the second nozzle is a round pipe or a square pipe; the first nozzle and/or the second nozzle is a circular nozzle or a slit nozzle.
14. The waste heat utilization system for a roller hearth heat treatment furnace according to claim 10, wherein a plurality of the first nozzles are located at a vertical distance of more than 50mm from an upper portion of the workpiece; the plurality of second nozzles are spaced from the lower portion of the workpiece by a vertical distance of 80mm to 120mm.
15. The waste heat utilization system for a roller hearth heat treatment furnace according to claim 10, wherein a shielding gas outlet that outputs the low-temperature shielding gas is provided at an upper portion of the housing;
the preheating device further comprises a first air box and a second air box, the first air box is connected with the plurality of first spray pipes respectively, the second air box is connected with the plurality of second spray pipes respectively, and the first air box and the second air box are provided with protective gas inlets respectively.
16. The waste heat utilization system for a roller hearth heat treatment furnace according to claim 8, wherein an inner liner is provided on an inner wall of the housing, the inner liner being for reducing heat radiation loss and avoiding excessive temperature of the housing.
17. The waste heat utilization system for a roller hearth heat treatment furnace according to claim 16, wherein at least part of the inner liner at an upper portion is made of lightweight fiber and at least part of the inner liner at a lower portion is made of brickwork.
18. The waste heat utilization system for a roller hearth heat treatment furnace according to claim 8, wherein the housing is a steel structure housing formed by welding various types of steel sections and/or steel plates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321982028.0U CN220304296U (en) | 2023-07-26 | 2023-07-26 | Waste heat utilization system for roller hearth heat treatment furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321982028.0U CN220304296U (en) | 2023-07-26 | 2023-07-26 | Waste heat utilization system for roller hearth heat treatment furnace |
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| CN220304296U true CN220304296U (en) | 2024-01-05 |
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| CN202321982028.0U Active CN220304296U (en) | 2023-07-26 | 2023-07-26 | Waste heat utilization system for roller hearth heat treatment furnace |
Country Status (1)
| Country | Link |
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| CN (1) | CN220304296U (en) |
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2023
- 2023-07-26 CN CN202321982028.0U patent/CN220304296U/en active Active
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