Tunnel-type double-cart continuous high-temperature annealing furnace bottom ventilation and cooling system

Abstract

This utility model relates to a ventilation and cooling system for the bottom of a tunnel-type double-cart continuous high-temperature annealing furnace. The annealing furnace includes a track and a firing adjustment platform located on one side of the track. The track includes a low-temperature section at the front end and a cooling section at the rear end. Several operating positions are provided on the track. The furnace bottom ventilation and cooling system includes: a fan located below the firing adjustment platform; the fan's input end is connected to the low-temperature section of the track; an air supply duct located below the firing adjustment platform and extending along its length, with its input end connected to the fan's output end; an air delivery duct located within the cooling section of the track and extending along its length; the air delivery duct's input end is connected to the air supply duct's output end via a deflector pipe; and several air delivery valves located along the length of the air delivery duct. This utility model can achieve furnace bottom ventilation and cooling in a tunnel-type high-temperature annealing furnace, avoiding excessively high furnace bottom temperatures and CO concentrations that could pose safety hazards to workers.

Description

Technical Field

[0001] This utility model relates to the field of tunnel annealing furnace technology, and in particular to a ventilation and cooling system for the bottom of a tunnel-type double-cart continuous high-temperature annealing furnace. Background Technology

[0002] The steel tunnel-type double-car continuous high-temperature annealing furnace has certain unique characteristics. Its car area is approximately twice that of a single car. The lower half of the tunnel kiln (below the cars) is relatively enclosed, with poor air circulation. Radiant heat generated at the bottom of the cars accumulates in this semi-enclosed space, causing the ambient temperature in this area to exceed 100°C. Ordinary fans cannot effectively remove such a large amount of heat. Furthermore, the annealing furnace uses natural gas as a heat source, producing CO during combustion. Due to the slightly positive pressure inside the furnace, CO seeps downwards from the gaps between the cars to the furnace bottom, increasing the CO concentration in the air at the bottom. If air circulation at the bottom of the furnace is poor, CO levels will exceed safe limits, posing a certain safety hazard.

[0003] The automation level of steel tunnel-type double-cart continuous high-temperature annealing furnace is relatively low. There are many manual operations required at the furnace bottom, such as pulling gas pipes, maintaining gas pipelines, measuring dew point on the car, and measuring furnace pressure on the car. Some operations need to be completed manually at the furnace bottom for a long time. Therefore, the high frequency of working in a high-temperature environment with poor air circulation makes the operators very susceptible to heatstroke and poisoning.

[0004] Therefore, the layout of the ventilation and cooling system for the tunnel-type double-carriage continuous high-temperature annealing furnace presents the following challenges: the space is long and narrow, making it difficult to lay out a transverse ventilation system; and ordinary axial flow fans are unable to solve the airflow problem, resulting in the accumulation of hot air, which leads to excessively high furnace bottom temperature and CO concentration in the rear working area, easily causing safety risks to furnace bottom workers.

[0005] Therefore, how to provide a furnace bottom ventilation and cooling system for a tunnel-type double-carriage continuous high-temperature annealing furnace has become an urgent problem to be solved. Summary of the Invention

[0006] To address the technical problems existing in the prior art, the purpose of this utility model is to provide a ventilation and cooling system for the bottom of a tunnel-type double-cart continuous high-temperature annealing furnace, thereby achieving cooling and ventilation of the bottom of the tunnel-type continuous high-temperature annealing furnace.

[0007] To achieve the aforementioned utility model objectives, this utility model provides a tunnel-type double-cart continuous high-temperature annealing furnace bottom ventilation and cooling system. The annealing furnace includes a track and a firing adjustment platform disposed on one side of the track. The track includes a low-temperature section disposed at the front end of the track and a cooling section disposed at the rear end of the track. Several operating positions are provided on the track. The furnace bottom ventilation and cooling system includes:

[0008] A fan is installed below the fire control platform; the input end of the fan is connected to the low-temperature section of the track.

[0009] An air supply duct is installed below the fire control platform and runs along the length of the fire control platform, with its input end connected to the output end of the fan.

[0010] An air supply duct is installed in the cooling section within the track and is arranged along the length of the track; the input end of the air supply duct is connected to the output end of the air conveying duct via a deflector duct.

[0011] Several air supply valves are arranged along the length of the air supply duct.

[0012] According to one technical solution of this utility model, it also includes:

[0013] Several temperature sensors are set on the cooling section and are set to correspond to the operating positions on the cooling section;

[0014] The controller is electrically connected to the temperature sensor and the air supply valve.

[0015] According to one technical solution of this utility model, the air volume of the fan is 12518-14931 m³ / h, the air pressure is 4869-4736 Pa, and the diameter of the air conveying pipe, the air supply pipe and the turning pipe is 240-270 mm.

[0016] According to one technical solution of this utility model, the air supply valve is evenly distributed along the air supply duct.

[0017] According to one technical solution of this utility model, the number of air supply valves is greater than the number of operating positions on the cooling section.

[0018] According to one technical solution of this utility model, the track includes a track groove and a trolley track disposed in the track groove, the air supply pipe is disposed on the side wall of the track groove, the air supply valve is disposed on the side wall of the air supply pipe, and the outlet of the air supply valve is disposed facing the trolley track.

[0019] Compared with the prior art, this utility model has the following advantages:

[0020] This invention utilizes the space of the annealing furnace to add a ventilation system below the annealing platform located on one side of the track. This system introduces relatively clean air with a lower temperature from the low-temperature section of the track into the furnace bottom, thereby reducing the ambient temperature and CO content at the furnace bottom and improving the working environment at the furnace bottom.

[0021] This utility model comprises an air duct consisting of an air conveying pipe, an air supply pipe, and a diversion pipe. By using a combination of a fan, an air duct, and an air supply valve, air from the low-temperature section can be diverted to the cooling section at the rear without the need to introduce air from the outside, ensuring a stable atmosphere inside the furnace and a stable working environment. At the same time, the cooling air is directly introduced into the working position of the cooling section through the air duct, improving the cooling efficiency.

[0022] In this invention, the fan, air duct, and air valve are positioned below the fire-adjusting platform and track to directly cool the furnace bottom. This reduces the layout space occupied by the ventilation system and improves the cooling and ventilation efficiency by directly cooling the furnace bottom. Attached Figure Description

[0023] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0024] Figure 1 This schematic diagram shows a top view of the bottom ventilation and cooling system of a tunnel-type double-cart continuous high-temperature annealing furnace according to one embodiment of the present invention.

[0025] Figure 2 The schematic diagram shows a side view of the bottom ventilation and cooling system of the tunnel-type double-cart continuous high-temperature annealing furnace provided in one embodiment of the present invention in the low-temperature section.

[0026] The correspondence between the attachment names and the figure labels is as follows:

[0027] 1. Main rail; 2. Auxiliary rail; 3. Fire control platform; 4. Fan; 5. Air supply duct; 6. Air delivery duct; 7. Diverting duct; 8. Air delivery valve. Detailed Implementation

[0028] The description of the embodiments in this specification should be taken in conjunction with the accompanying drawings, which should form part of the complete specification. In the drawings, the shape or thickness of the embodiments may be exaggerated and may be indicated in a simplified or convenient manner. Furthermore, parts of the various structures in the drawings will be described separately; it is worth noting that elements not shown in the figures or not described in words are in a form known to those skilled in the art.

[0029] The description of the embodiments herein, including any references to direction and orientation, is for ease of description only and should not be construed as limiting the scope of protection of this utility model. The following description of preferred embodiments involves combinations of features, which may exist independently or in combination; this utility model is not particularly limited to the preferred embodiments. The scope of this utility model is defined by the claims.

[0030] like Figure 1 and 2 As shown, this utility model discloses a bottom ventilation and cooling system for a tunnel-type double-cart continuous high-temperature annealing furnace, applicable to a tunnel-type continuous high-temperature annealing furnace. The annealing furnace includes a track and a firing adjustment platform 3 disposed on one side of the track. In some embodiments of this utility model, the track may include a main track 1 for annealing and an auxiliary track 2 for cooling, with the bottom ventilation and cooling system disposed within the main track 1. The track includes a low-temperature section disposed at the front end and a cooling section disposed at the rear end. Several operating positions are provided on the track. The bottom ventilation and cooling system includes a fan 4, an air conveying pipe 5, an air supply pipe 6, a diverting pipe 7, and an air supply valve 8. The fan 4 is disposed below the firing adjustment platform 3, with its input end connected to the low-temperature section of the track; the fan 4 may be a variable frequency fan. The air conveying pipe 5 is disposed below the firing adjustment platform 3, extending along the length of the firing adjustment platform 3, with its input end connected to the output end of the fan 4. The air supply pipe 6 is disposed within the cooling section of the track, extending along the length of the track. The inlet of the air supply duct 6 is connected to the outlet of the air supply duct 5 via a diversion duct 7. Several air supply valves 8 are installed along the length of the air supply duct 6.

[0031] In some embodiments of this utility model, the fan 4 can be configured to connect with the first operating position of the low-temperature section of the track, where the temperature is at room temperature year-round, but slightly lower than room temperature in summer. The air supply duct 5 is connected to the air supply duct 6 located in the cooling section at the tail of the furnace via a deflection duct 7 located in the space below the fire control platform. The tail cooling section includes operating positions numbered 17-28.

[0032] In some embodiments of this utility model, the air volume of the fan 4 is 12518-14931 m³ / h. 3 / h, wind pressure is 4869-4736Pa. The air duct composed of air supply pipe 5, air delivery pipe 6 and turning pipe 7 can be made of galvanized iron pipe with a diameter of 240-270mm, preferably 250mm, and is evenly distributed in the cooling section through 15-20 air delivery valves 8.

[0033] In some embodiments of this invention, the furnace bottom ventilation and cooling system further includes temperature sensors and a controller. Several temperature sensors are disposed on the cooling section, corresponding to operating positions on the cooling section. The controller is electrically connected to the temperature sensors and the air supply valve.

[0034] Temperature sensors monitor the temperature at the operating positions in the cooling section, and a controller adjusts the opening of the air supply valve 8. This allows the 150.48 m³ of airflow to be released as needed based on the furnace bottom temperature distribution at operating positions 17-28. Different operating positions have different requirements for furnace bottom temperature adjustment. Operating position 28, being closer to the outside temperature and relatively lower, has a lower ventilation requirement, allowing the opening of air supply valve 8 to be reduced. Ultimately, by adjusting the layout and opening of air supply valve 8, the ventilation volume in different areas is adjusted to achieve optimal furnace bottom cooling, thus realizing the effects of furnace bottom cooling and air purification.

[0035] In some embodiments of this utility model, the air supply valves 8 are evenly distributed along the air supply duct 6 to ensure the uniformity of air supply from the air supply valves 8. The number of air supply valves 8 is greater than the number of operating positions included in the cooling section, thereby improving the cooling and ventilation effect of the cooling section.

[0036] In some embodiments of this utility model, the track includes a track groove and a trolley track disposed within the track groove. An air supply duct is disposed on the side wall of the track groove, and an air supply valve 8 is disposed on the side wall of the air supply duct, with the outlet of the air supply valve 8 facing the trolley track. By aligning the outlet of the air supply valve with the trolley track, the air outlet direction of the air supply valve 8 is directly opposite the bottom of the trolley on the track, thereby improving the dispersion efficiency of CO leaking from the bottom of the trolley, further preventing CO accumulation near the operating position at the bottom of the annealing furnace, reducing CO concentration, and improving the safety of workers.

[0037] The working process of this utility model is as follows:

[0038] During the operation of the tunnel-type continuous high-temperature annealing furnace, the blower 4 is turned on, drawing air from the first operating position in the low-temperature zone of the main rail 1 into the air supply duct 5. This air is then delivered through the diversion duct 7 into the air supply duct 6 located in the cooling zone. Based on the temperature feedback from the temperature sensors at each operating position in the cooling zone, the controller adjusts the opening of the air supply valve 8, blowing air from the low-temperature zone into the cooling zone. This accelerates air circulation within the annealing furnace, achieving both cooling and ventilation in the cooling zone. Because the air supply duct 5, air supply duct 6, and diversion duct 7 are located below the annealing platform 3 or within the main rail 1, they do not occupy floor space in the annealing furnace, thus improving the space utilization rate of the annealing furnace.

[0039] The section at the bottom of the furnace requiring cooling is located at operating positions 17-28, totaling 12 operating positions with a length of 36m. This space is 1.9m wide and 2.2m high. The total space size is: 36 * 1.9 * 2.2 = 150.48m³.

[0040] According to the flow calculation formula:

[0041]

[0042] Where Q is the flow rate, Pd is the dynamic pressure of the fan in Pa, D is the diameter of the duct in m, and the above formula is applicable under the condition that the standard air density ρ = 1.2 kg / m³.

[0043] Calculate whether the airflow rate of a 250mm diameter duct meets the airflow rate generated by the fan under a wind pressure of 4736Pa. The calculation results are as follows:

[0044]

[0045] Calculations show that the ventilation capacity of the duct is greater than the air production capacity of fan 4. Therefore, under full-load operation of fan 4, the air exchange effect can reach approximately 150.48 / 14931 ≈ 36 seconds, replacing the air at operating positions 17-28 once. This can reduce the furnace bottom temperature by 30-50℃, lowering the furnace bottom ambient temperature to 50-70℃. Practical results show that at an ambient temperature of 50-70℃, operators can work for 40-60 minutes with minimal impact on human health. After air replacement, the CO content in the environment can be reduced to below 50ppm, with a target level of 20ppm, thus reducing the risk of poisoning.

[0046] Finally, it should be noted that the above description represents the preferred embodiment of this utility model. It should be pointed out that although the preferred embodiment of this utility model has been described, those skilled in the art, once they understand the basic inventive concept of this utility model, can make several improvements and modifications without departing from the principles described herein. These improvements and modifications should also be considered within the protection scope of this utility model. Therefore, the appended claims are intended to be interpreted as including the preferred embodiment as well as all changes and modifications falling within the scope of the embodiments of this utility model.

Claims

1. A tunnel-type double-cart continuous high-temperature annealing furnace bottom ventilation and cooling system, the annealing furnace including a track and a fire-adjusting platform (3) disposed on one side of the track, the track including a low-temperature section disposed at the front end of the track and a cooling section disposed at the rear end of the track; the track is provided with a plurality of operating positions; characterized in that, The furnace bottom ventilation and cooling system includes: A fan (4) is located below the fire control platform (3); the input end of the fan (4) is connected to the low-temperature section of the track; An air supply duct (5) is set below the fire control platform (3) and along the length of the fire control platform (3), with its input end connected to the output end of the fan (4); An air supply duct (6) is installed in the cooling section within the track and is arranged along the length of the track; the input end of the air supply duct (6) is connected to the output end of the air supply duct (5) through a turning duct (7); Several air supply valves (8) are arranged along the length of the air supply duct (6).

2. The tunnel type double-deck continuous high temperature annealing furnace bottom ventilation cooling system according to claim 1, characterized in that, Also includes: Several temperature sensors are set on the cooling section and are set to correspond to the operating positions on the cooling section; The controller is electrically connected to the temperature sensor and the air supply valve (8).

3. The tunnel type double-deck continuous high temperature annealing furnace bottom ventilation cooling system according to claim 1, characterized in that, The air volume of the fan (4) is 12518-14931 m³ / h, the air pressure is 4869-4736 Pa, and the diameter of the air conveying pipe (5), the air supply pipe (6) and the turning pipe (7) is 240-270 mm.

4. The tunnel type double-deck continuous high temperature annealing furnace bottom ventilation cooling system according to claim 1, characterized in that, The air supply valves (8) are evenly distributed along the air supply duct (6).

5. The tunnel type double-deck continuous high temperature annealing furnace bottom ventilation cooling system according to claim 1, characterized in that, The number of air supply valves (8) is greater than the number of operating positions on the cooling section.

6. The tunnel type double-deck continuous high temperature annealing furnace bottom ventilation cooling system according to claim 1, characterized in that, The track includes a track groove and a trolley track disposed in the track groove. The air supply pipe (6) is disposed on the side wall of the track groove. The air supply valve (8) is disposed on the side wall of the air supply pipe (6). The outlet of the air supply valve (8) is disposed facing the trolley track.

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