CN219079607U - Steel quenching system - Google Patents
Steel quenching system Download PDFInfo
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- CN219079607U CN219079607U CN202221639195.0U CN202221639195U CN219079607U CN 219079607 U CN219079607 U CN 219079607U CN 202221639195 U CN202221639195 U CN 202221639195U CN 219079607 U CN219079607 U CN 219079607U
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Abstract
The utility model relates to a steel quenching system, which comprises a quenching furnace and a quenching cooling device, wherein a quenching transfer area heating device for heating steel is arranged in a quenching transfer area between the quenching furnace and the quenching cooling device. According to the steel quenching system, the transfer zone heating device is arranged in the quenching transfer zone, so that steel can be heated in the quenching transfer process, the steel is ensured to keep proper quenching temperature, the conditions of steel performance reduction and the like caused by steel temperature reduction in the quenching transfer time are avoided, and the quality of produced steel products is ensured; and the production control is convenient, and the production rhythm is not required to be disturbed in order to shorten the quenching transfer time.
Description
Technical Field
The utility model belongs to the technical field of steel production, and particularly relates to a steel quenching system.
Background
Heat treatment furnaces are widely used as effective equipment for improving the mechanical properties of steel. For a general heat treatment furnace, the furnace door is opened until the front end of the plate meets the quenching cooling medium, and a certain movement time is required for the steel due to a certain space distance, which is called quenching transfer time. In the quenching transfer time, the steel is in contact with cold air in the process of transferring to the quenching section, which is equivalent to cooling in the air; the cooling speed is low, particularly, the steel billet with smaller thickness is very sensitive to the cooling speed, and the degradation of the solid solution can reduce the aging strengthening effect, so that the mechanical property of the product is reduced, and meanwhile, the oxidation of the steel billet is increased; and the thinner the steel plate thickness is, the more serious the temperature drop is. In addition, since austenite is not formed completely at the quenching temperature, a small amount of ferrite remains in the quenched structure in addition to martensite, and the hardness of the steel is insufficient. Because the quenching transfer time is short, most of steel enterprises cannot pay attention to quality defects caused by the temperature reduction of steel materials in the process, production units basically shorten the quenching transfer time as much as possible, but the method has obviously limited effect, and the transportation speed of the steel materials cannot completely meet the requirements under the influence of various factors in production, so that the quenching transfer time is prolonged in some cases.
Disclosure of Invention
The utility model relates to a steel quenching system which at least can solve part of defects in the prior art.
The utility model relates to a steel quenching system, which comprises a quenching furnace and a quenching cooling device, wherein a quenching transfer area heating device for heating steel is arranged in a quenching transfer area between the quenching furnace and the quenching cooling device.
As one of the implementation modes, the transfer zone heating device comprises an upper blowing unit arranged above the strip steel running channel and a lower blowing unit arranged below the strip steel running channel, wherein both the upper blowing unit and the lower blowing unit are connected with a blowing air supply mechanism.
As one embodiment, the blowing air supply mechanism comprises a blowing air source and a blowing air supply pipe, and a main heating unit is arranged on the blowing air supply pipe.
As one embodiment, the main heating unit employs an electric heating device.
As one embodiment, a heat exchanger is further provided on the air-blowing air supply pipe, the heat exchanger being located upstream of the main heating unit.
As one embodiment, the blowing air source adopts a protective air source.
As one embodiment, a front end detection unit and a rear end detection unit are arranged on the air-blowing air supply pipe, and the front end detection unit and the rear end detection unit are respectively arranged at the upstream and downstream of the main heating unit; the front end detection unit and the rear end detection unit are both electrically connected with the central console, the front end detection unit is used for detecting the gas temperature and the gas flow rate at the inlet side of the main heating unit and sending the detection result to the central console as a feedforward signal, the rear end detection unit is used for detecting the gas temperature at the outlet side of the main heating unit and sending the detection result to the central console as a feedback signal, and the central console is used for controlling the operation of the main heating unit according to the obtained feedforward signal and feedback signal.
As one of the embodiments, the blowing directions of the upper blowing unit and the lower blowing unit are both toward the quenching furnace, and the included angle between the upper blowing unit and the steel running channel is in the range of 30-45 degrees.
As one of implementation modes, a sealing cover is further arranged between the quenching furnace and the quenching cooling device, the sealing cover encloses the strip steel running channel of the quenching transfer area and the transfer area heating device, and an exhaust pipe is arranged on the sealing cover.
As one embodiment, the exhaust pipe is connected with a negative pressure suction unit.
The utility model has at least the following beneficial effects:
according to the steel quenching system, the transfer zone heating device is arranged in the quenching transfer zone, so that steel can be heated in the quenching transfer process, the steel is ensured to keep proper quenching temperature, the conditions of steel performance reduction and the like caused by steel temperature reduction in the quenching transfer time are avoided, and the quality of produced steel products is ensured; and the production control is convenient, and the production rhythm is not required to be disturbed in order to shorten the quenching transfer time.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an arrangement structure of a transfer zone heating device according to an embodiment of the present utility model;
fig. 2 is a side view of fig. 1.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely, and it is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1 and 2, an embodiment of the present utility model provides a steel quenching system, including a quenching furnace 2 and a quenching cooling device, wherein a quenching transfer region between the quenching furnace 2 and the quenching cooling device is provided with a transfer region heating device for heating steel.
According to the steel quenching system provided by the embodiment, the transfer zone heating device is arranged in the quenching transfer zone, so that steel can be heated in the quenching transfer process, the steel is ensured to keep proper quenching temperature, the conditions of steel performance reduction and the like caused by steel temperature reduction in the quenching transfer time are avoided, and the quality of the produced steel products is ensured; and the production control is convenient, and the production rhythm is not required to be disturbed in order to shorten the quenching transfer time.
Preferably, the air blowing heating mode is adopted, equipment arrangement is facilitated, the method is applicable to reconstruction of new projects and established projects, and heating temperature is easy to control. Specifically, the transfer zone heating device comprises an upper blowing unit 11 arranged above the strip steel running channel and a lower blowing unit 12 arranged below the strip steel running channel, wherein the upper blowing unit 11 and the lower blowing unit 12 are connected with a blowing air supply mechanism 13.
The blowing air supply means 13 includes a blowing air source and a blowing air supply pipe, wherein the blowing air source preferably employs a shielding air source, that is, a shielding air which does not react with the steel material and prevents the steel material from reacting with air, such as a nitrogen source or an argon source. The protective gas is used as heating gas, so that the steel can be ensured to have proper quenching temperature, and oxidation caused by contact of the steel and air can be avoided, and the quality of the steel can be obviously improved.
Preferably, as shown in fig. 1, the upper blowing unit 11 and the lower blowing unit 12 each comprise a nozzle, the axial direction of the nozzle is parallel to the width direction of the strip running channel, and a plurality of nozzles or spouts are arranged on the nozzle, wherein the nozzles/spouts are distributed on the nozzle in one or more rows, and the length direction of each nozzle row or spout row is parallel to the axial direction of the nozzle. Wherein, one or more spray pipes can be arranged according to the length of the quenching transfer zone; preferably, the distance from the outlet center/the spout center of each nozzle on the spray pipe to the passing steel wire is the same, so that the uniformity of steel heating is ensured.
In one embodiment, the blowing directions of the upper blowing unit 11 and the lower blowing unit 12 are both towards the quenching furnace 2, and an included angle between the upper blowing unit and a steel running channel is in a range of 30-45 degrees; the structure enables the blowing air and the steel to reversely contact and exchange heat, so that the heat exchange effect can be improved, and on the other hand, the contact time and contact area of the hot air and the steel billet can be prolonged, and the heating effect can be improved.
Further, a main heating unit is arranged on the air blowing air supply pipe, so that the temperature of air blowing air is easy to control; preferably, the main heating means heats the blown air to a temperature equal to or higher than the quenching temperature of the steel, for example, the quenching temperature of a general billet is equal to or higher than 900 ℃, and in this embodiment, the main heating means heats the blown air to a temperature higher than the quenching temperature by about 50 ℃. Therefore, the blowing air is preferably heated by adopting a direct contact heat exchange mode; preferably, the main heating unit adopts an electric heating device, so that the main heating unit can perform direct contact heat exchange with the blowing air, and the electric heating device is small in size and easy to arrange on site.
Further preferably, a heat exchanger is further provided on the air-blowing air supply pipe, the heat exchanger being located upstream of the main heating unit. The primary heating is carried out on the air blowing air through the heat exchanger, so that the energy consumption of the main heating unit can be reduced, and meanwhile, the heating speed and the heating efficiency of the air blowing air are improved. In one embodiment, the high temperature medium of the heat exchanger is the exhaust gas of the quenching furnace 2, i.e. the quenching furnace 2 has an exhaust gas discharge pipe which is connected to the high temperature medium pipe of the heat exchanger.
Further preferably, a front end detection unit and a rear end detection unit are arranged on the air-blowing air supply pipe, and the front end detection unit and the rear end detection unit are respectively arranged at the upstream and downstream of the main heating unit; the front end detection unit and the rear end detection unit are both electrically connected with the central console, the front end detection unit is used for detecting the gas temperature and the gas flow rate at the inlet side of the main heating unit and sending the detection result to the central console as a feedforward signal, the rear end detection unit is used for detecting the gas temperature at the outlet side of the main heating unit and sending the detection result to the central console as a feedback signal, and the central console is used for controlling the operation of the main heating unit according to the obtained feedforward signal and feedback signal. Based on the scheme, closed-loop control of air injection heating can be realized, and the air injection is heated to a set temperature so as to meet the process requirements, and the energy consumption can be reduced.
In one embodiment, a sealing cover is further arranged between the quenching furnace 2 and the quenching cooling device, the sealing cover encloses the strip steel running channel of the quenching transfer area and the transfer area heating device, and an exhaust pipe is arranged on the sealing cover. Through setting up the sealed cowling, can prevent that the heating gas of spraying from overflowing and causing energy loss and potential safety hazard, can keep relatively stable high temperature gas flow field in airtight environment in addition, improve heating effect and heating efficiency to steel, show the reduction energy consumption to can isolate the air better. The upper blowing unit 11 and the lower blowing unit 12 can be arranged on the sealing cover, so that the arrangement is convenient and the structure is compact.
Further, the exhaust pipe is connected with a negative pressure suction unit. The exhaust pipe can be connected into the chimney, and the negative pressure of the chimney is utilized to form a suction effect, so that the blowing air is discharged. In a further preferred embodiment, the extracted high-temperature injection air can be used for waste heat utilization.
For the above-mentioned spray gas waste heat utilization scheme:
in one embodiment, the exhaust pipe is connected to the air-blowing air supply pipe by side, and the bypass point is positioned at the upstream of the main heating unit, so that the recycling of the air-blowing air is realized, the waste heat of the air-blowing air can be fully utilized, the air-blowing air consumption and the energy consumption of the main heating unit are obviously reduced, and the cost is obviously reduced; further, a purifier may be provided on the exhaust pipe to remove dust and purify the extracted blown air, and conventional gas purifying apparatuses are applicable to the present embodiment. Of course, the exhaust pipe may be connected to the heat exchanger, and the extracted blown air may be used as the high-temperature medium gas.
In other embodiments, when the quenching furnace 2 adopts a flame heating mode, the extracted high-temperature blowing air can be used for heating combustion air used by the quenching furnace 2, for example, an air preheater is arranged on a combustion air pipe of the quenching furnace 2, and the exhaust pipe is connected with a high-temperature medium pipe of the air preheater.
In another embodiment, when the entrance of the quenching furnace 2 needs to be sealed by nitrogen, the extracted high-temperature air-blowing air can be used as sealing nitrogen, that is, the exhaust pipe is connected with the sealing nitrogen pipe of the quenching furnace 2.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (6)
1. The utility model provides a steel quenching system, includes quenching furnace and quenching cooling device, its characterized in that: a transfer zone heating device for heating the steel is arranged in a quenching transfer zone between the quenching furnace and the quenching cooling device;
the transfer zone heating device comprises an upper blowing unit arranged above the strip steel running channel and a lower blowing unit arranged below the strip steel running channel, wherein the upper blowing unit and the lower blowing unit are connected with a blowing air supply mechanism;
the blowing air supply mechanism comprises a blowing air source and a blowing air supply pipe, and a main heating unit is arranged on the blowing air supply pipe;
a heat exchanger is further arranged on the air blowing air supply pipe, and the heat exchanger is positioned at the upstream of the main heating unit;
a front end detection unit and a rear end detection unit are arranged on the air blowing air supply pipe, and the front end detection unit and the rear end detection unit are respectively arranged at the upstream and downstream of the main heating unit; the front end detection unit and the rear end detection unit are both electrically connected with the central console, the front end detection unit is used for detecting the gas temperature and the gas flow rate at the inlet side of the main heating unit and sending the detection result to the central console as a feedforward signal, the rear end detection unit is used for detecting the gas temperature at the outlet side of the main heating unit and sending the detection result to the central console as a feedback signal, and the central console is used for controlling the operation of the main heating unit according to the obtained feedforward signal and feedback signal.
2. The steel quenching system as recited in claim 1 wherein: the main heating unit adopts an electric heating device.
3. The steel quenching system as recited in claim 1 wherein: the spraying air source adopts a protective air source.
4. The steel quenching system as recited in claim 1 wherein: the spraying directions of the upper spraying unit and the lower spraying unit face the quenching furnace, and an included angle between the upper spraying unit and the lower spraying unit and a steel running channel is within a range of 30-45 degrees.
5. The steel quenching system as claimed in any one of claims 1 to 4, wherein: a sealing cover is arranged between the quenching furnace and the quenching cooling device, the sealing cover encloses the strip steel running channel of the quenching transfer area and the heating device of the transfer area, and an exhaust pipe is arranged on the sealing cover.
6. The steel quenching system as recited in claim 5 wherein: the exhaust pipe is connected with a negative pressure suction unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221639195.0U CN219079607U (en) | 2022-06-28 | 2022-06-28 | Steel quenching system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221639195.0U CN219079607U (en) | 2022-06-28 | 2022-06-28 | Steel quenching system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219079607U true CN219079607U (en) | 2023-05-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221639195.0U Active CN219079607U (en) | 2022-06-28 | 2022-06-28 | Steel quenching system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219079607U (en) |
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2022
- 2022-06-28 CN CN202221639195.0U patent/CN219079607U/en active Active
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