Cooling device of pre-oxidation furnace without protective atmosphere and control method

Abstract

The invention discloses a cooling device of a pre-oxidizing furnace without protective atmosphere and a control method. The cooling device comprises a feeding unit, a humidifying unit and a pre-oxidizing furnace unit. The feeding unit is used for feeding the pre-oxidized felt and controlling the speed of the pre-oxidized felt entering the pre-oxidizing furnace unit; the humidifying unit is located above the feeding unit, and spraying cooling of the pre-oxidized felt above the feeding unit is achieved through the humidifying unit; a plurality of heating areas are arranged in the pre-oxidation furnace unit, and the temperature of each heating area is independently controlled; furthermore, the humidifying unit is transversely arranged above the feeding unit, and atomizing spraying on the upper portion of the pre-oxidized felt is formed by controlling a spraying head additionally arranged on the humidifying unit. According to the whole device and method, the pre-oxidation furnace without the protective atmosphere is adopted for producing the pre-oxidized felt, so that water vapor or nitrogen is saved, and a great deal of energy consumption cost can be saved. Through the cooling measure, the temperature of the out-of-control temperature area can be reduced in time, the pre-oxidized felt is prevented from being burnt out by high temperature or production is prevented from being interrupted, and the production efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of pre-oxygenation furnace cooling, and in particular relates to a cooling device and a control method for a pre-oxygenation furnace without protective atmosphere. Background Art

[0002] At present, the pre-oxidation furnaces used in the production of pre-oxidation felts usually use a protective atmosphere to prevent the oxygen content in the furnace from being too high during the pre-oxidation process, which will lead to excessively high thermal reaction temperatures and burnt felts. The protective atmospheres generally used are water vapor or nitrogen, while the pre-oxidation furnaces without protective atmospheres completely rely on the waste gas generated by the reaction of the felt body itself as a protective gas. After a certain pressure is generated by the accumulation of reaction gas, the feed and discharge ports of the pre-oxidation furnace are sealed to reduce the amount of air entering the pre-oxidation furnace. Since the amount of waste gas generated by the reaction of the felt body itself is small, once the reaction fluctuates, it is easy to cause the air pressure in the furnace to be lower than the external air pressure, allowing external air to enter the furnace, causing local high temperatures in the furnace, and the local high temperatures in the furnace will cause the reaction to be more intense, releasing more heat, causing the entire pre-oxidation reaction to be out of control, and the felt body to deform or burn due to excessive temperature.

[0003] In the Chinese patent application announcement number CN220418105 U, a pre-oxidation furnace automatic control cooling and humidification system is disclosed, including: a heater and a fan are installed in the oxidation chamber inside the furnace body; an atomization cooling component is arranged on the furnace body, including an atomization pipeline, an electric regulating valve arranged on the atomization pipeline, and an atomization nozzle arranged at the end of the atomization pipeline, and the atomization nozzle is placed in the oxidation chamber; a temperature sensor is arranged on the furnace body, which is used to detect the temperature of the air in the oxidation chamber. Although the oxidation furnace can be cooled, in actual use, the entire equipment needs to be temporarily stopped, which will affect the production progress. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a cooling device and a control method for a pre-oxygenation furnace without a protective atmosphere, which solves the above-mentioned technical problems existing in the prior art.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A cooling device for a pre-oxygenation furnace without protective atmosphere, comprising a feeding unit, a humidifying unit and a pre-oxygenation furnace unit;

[0007] The feeding unit is used to feed the preoxidation felt and control the speed at which the preoxidation felt enters the preoxidation furnace unit;

[0008] The humidifying unit is located above the feeding unit, and the humidifying unit is used to spray and cool the pre-oxidation felt above the feeding unit;

[0009] The pre-oxygenation furnace unit is provided with a plurality of temperature-raising zones, and each of the temperature-raising zones is independently temperature-controlled;

[0010] Furthermore, the humidification unit is arranged horizontally above the feeding unit, and the spray head added to the humidification unit is controlled to form an atomized spray above the pre-oxidation felt. When the temperature is lowered, the spraying amount is controlled at 360-720 g / m 2 .

[0011] Furthermore, the feed inlet and the discharge outlet of the pre-oxygenation furnace unit are both provided with air suction hoods;

[0012] The pre-oxidation furnace unit is provided with a transmission member which runs through a plurality of temperature-increasing zones and is used for transmitting the pre-oxidation felt.

[0013] Furthermore, the temperature rising zone includes a first temperature rising zone, a second temperature rising zone, a third temperature rising zone, a fourth temperature rising zone, and a fifth temperature rising zone, which are arranged sequentially from right to left.

[0014] Furthermore, heating devices and temperature control devices are independently provided at the upper and lower ends of the first temperature rising zone, the second temperature rising zone, and the third temperature rising zone.

[0015] Furthermore, a temperature control device is provided at the lower end where the fourth temperature rising zone and the fifth temperature rising zone are located.

[0016] The control method of the cooling device of the non-protective atmosphere pre-oxygenation furnace comprises the following steps:

[0017] S1. First, the feeding unit and the preoxidation furnace unit use the set temperature to transfer and heat the preoxidation felt. When the temperature of any temperature rising zone exceeds the preset temperature by more than 20°C, the feeding speed of the preoxidation felt through the feeding unit is reduced to 5-10m / h;

[0018] S2, open the spray head of the humidification unit to make the soft water sprayed by atomization to cover the surface of the pre-oxidized felt, and control the spraying amount of soft water to 360-720g / m 2 ;

[0019] S3, setting the upper temperature of the first heating zone to increase by 10-15°C based on the original temperature, and setting the lower temperature of the first heating zone to increase by 8-13°C based on the original temperature;

[0020] S4, setting the upper temperature of the second heating zone to increase by 5 to 8°C based on the original temperature, and setting the lower temperature of the second heating zone to increase by 5 to 8°C based on the original temperature;

[0021] S5, turning off the upper temperature and the lower temperature of the third heating zone, while the fourth heating zone and the fifth heating zone continue to heat at the original temperature;

[0022] S6. When the temperature in the over-temperature zone drops and stabilizes to the preset temperature, the feed speed is restored to 18m / h, and the temperature of each heating zone is adjusted to the preset temperature.

[0023] Furthermore, in S6, when the temperature of the over-temperature zone drops to the preset temperature range of 5 to 15°C, the feeding speed of the feeding unit to the preoxidation felt is controlled to be 10 to 14 m / h, and then the spraying amount of the humidifying unit is set to 180 to 280 g / m 2 ;

[0024] The upper temperature of the first heating zone is increased by 8 to 12°C on the basis of the original temperature, and the lower temperature of the first heating zone is increased by 6 to 10°C on the basis of the original temperature;

[0025] Adjust the upper and lower temperatures of the second temperature rising zone to the original temperature, i.e., 228° C.;

[0026] The upper heating and the lower heating of the third temperature rising zone are turned on at the same time to heat the device to a temperature of 204°C.

[0027] Further, in S6, when the temperature of the over-temperature zone drops to within 2-5°C of the preset temperature, the feeding speed of the feeding unit to the preoxidation felt is 10-14 m / h;

[0028] Then turn off the mist spray of the humidification unit;

[0029] The upper temperature of the first temperature rising zone is set to increase by 4 to 6° C. on the basis of the original temperature, and the lower temperature is set to increase by 4 to 6° C. on the basis of the original temperature.

[0030] Adjust the upper and lower temperatures of the second temperature rising zone to the original temperature, i.e., 228° C.;

[0031] At this time, the temperature of the third heating zone was adjusted to the original temperature of 204°C.

[0032] Further, in S6, when the temperature of the over-temperature zone drops to within 0-2°C of the preset temperature, the feeding speed of the feeding unit is adjusted to 20-26 m / h;

[0033] And simultaneously adjust the upper and lower temperatures of the first heating zone to 192°C;

[0034] At this time, the temperatures of the second temperature rising zone and the third temperature rising zone are adjusted to the original temperatures.

[0035] Beneficial effects of the present invention:

[0036] 1. The cooling device and method adopted in this device can realize the cooling operation of the entire equipment without stopping during the production process of preoxidation felt, which greatly improves its production efficiency.

[0037] 2. This device uses a non-protective atmosphere pre-oxidation furnace to produce pre-oxidation felt, which saves water vapor or nitrogen and can save a lot of energy consumption costs.

[0038] 3. Through this cooling measure, the device can timely reduce the temperature of the out-of-control temperature zone to avoid high temperature burning of the preoxidation felt or interruption of production. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0040] Figure 1 is a schematic diagram of the overall structure of an embodiment of the present invention;

[0041] Figure 2 is a schematic diagram of the overall top view structure of an embodiment of the present invention;

[0042] Figure 3 It is a schematic diagram of the overall process when the temperature in the over-temperature zone exceeds 20° C. in an embodiment of the present invention;

[0043] Figure 4 This is a schematic diagram of the overall process when the temperature in the over-temperature zone of the embodiment of the present invention exceeds 5 to 15°C;

[0044] Figure 5 It is a schematic diagram of the overall process when the temperature in the over-temperature zone of an embodiment of the present invention exceeds 2-5°C. DETAILED DESCRIPTION

[0045] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] like Figure 1 , Figure 2 As shown, an embodiment of the present invention provides a cooling device for a pre-oxygenation furnace without protective atmosphere, comprising a feeding unit 1, a humidifying unit 2 and a pre-oxygenation furnace unit;

[0047] The feeding unit 1 is used to feed the preoxidation felt and control the speed at which the preoxidation felt enters the preoxidation furnace unit.

[0048] The humidifying unit 2 is located above the feeding unit 1. The humidifying unit 2 is used to spray and cool the preoxidation felt above the feeding unit 1, forming an atomized spray above the preoxidation felt. The spray head sprays soft water, which will not cause hardening and scaling on the surface of the preoxidation felt. Within the normal temperature range, the humidifying unit 2 does not perform a spraying operation, and the spraying speed is controllable.

[0049] There are multiple temperature rising zones in the pre-oxygenation furnace unit, including and each temperature rising zone is independently temperature controlled; including the first temperature rising zone 31, the second temperature rising zone 32, the third temperature rising zone 33, the fourth temperature rising zone 34, and the fifth temperature rising zone 35, and they are arranged from right to left, that is, arranged in sequence from the direction of feeding to the direction of discharging. Among them, the upper and lower ends of the first temperature rising zone 31, the second temperature rising zone 32, and the third temperature rising zone 33 are independently provided with heating devices (generally using heating wires) and temperature control devices, which can perform temperature rise and fall control while performing temperature monitoring.

[0050] A temperature control device is provided at the lower end where the fourth temperature rising zone 34 and the fifth temperature rising zone 35 are located, which is only used for temperature monitoring but not for heating control.

[0051] The humidifying unit 2 is arranged horizontally above the feeding unit 1. By controlling the spray head added to the humidifying unit 2, the spraying amount is controlled at 360-720 g / m 2 .

[0052] The feed inlet and the discharge outlet of the preoxidation furnace unit are both provided with suction hoods 301, which can absorb the burrs that are easy to fall off on the surface of the preoxidation felt.

[0053] A transmission member 302 is built into the preoxidation furnace unit and runs through multiple temperature rising zones for transmitting the preoxidation felt.

[0054] like Figure 3 As shown, the control method of the cooling device of the pre-oxygen furnace without protective atmosphere comprises the following steps:

[0055] S1. First, the feeding unit 1 and the pre-oxidation furnace unit use the set temperature to transport and heat the pre-oxidation felt. Under normal circumstances, the transmission speed of the feeding unit 1 is 18m / h, the temperature control temperature of the first temperature rising zone 31 is 192°C, the temperature control temperature of the second temperature rising zone 32 is 228°C, the temperature control temperature of the third temperature rising zone 33 is 204°C, the temperature control temperature of the fourth temperature rising zone 34 is 150°C, and the temperature control temperature of the fifth temperature rising zone is 135°C.

[0056] When the temperature of any heating zone exceeds the preset temperature by more than 20°C, the feeding speed of the preoxidation felt through the feeding unit 1 is reduced to 5-10m / h. The areas most prone to temperature changes are the second heating zone 32, the third heating zone 33, and the fourth heating zone 34.

[0057] S2, open the spray head of humidification unit 2, so that the soft water sprayed by atomization forms a surface covering of the pre-oxidation felt (i.e., increases the water content of the pre-oxidation felt), and control the spraying amount of soft water to 360-720g / m 2When the preoxidation felt enters the preoxidation furnace, on the one hand, the water evaporates and absorbs a large amount of heat to reduce the temperature in the furnace; on the other hand, the water vapor formed increases the pressure in the preoxidation furnace, making the air pressure in the preoxidation furnace greater than the external air pressure, thus preventing a large amount of air from entering the preoxidation furnace.

[0058] S3. The upper temperature of the first temperature rising zone 31 is set to increase by 10-15°C (i.e., 202-207°C) based on the original temperature, and the lower temperature of the first temperature rising zone 31 is set to increase by 8-13°C (i.e., 200-205°C) based on the original temperature. At this time, during the cooling process, since the first temperature rising zone 31 is closest to the feed inlet of the pre-oxidation felt, it needs to be heated to avoid a sharp drop in the temperature of this temperature zone after water evaporation and heat absorption.

[0059] S4. The upper temperature of the second temperature rising zone 32 is set to increase by 5 to 8°C (i.e., 233 to 236°C) based on the original temperature, and the lower temperature of the second temperature rising zone 32 is set to increase by 5 to 8°C (i.e., 233 to 236°C) based on the original temperature. At this time, the second temperature rising zone 32 is closer to the first temperature rising zone 31, and therefore, a temperature rising operation is also required to avoid a sharp drop in the temperature of this temperature zone after water evaporates and absorbs heat.

[0060] S5. Turn off the upper temperature and the lower temperature of the third temperature rising zone 33 (i.e., the third temperature rising zone 33 stops heating at this time). At this time, the third temperature rising zone 33 belongs to the reaction zone, and its temperature is the highest (compared with the fourth temperature rising zone 34 and the fifth temperature rising zone 35). It is the temperature zone most prone to abnormal temperature rise, so the heating needs to be turned off.

[0061] S6, such as Figure 4 As shown in the figure, when the temperature in the over-temperature zone drops to the preset temperature range of 5 to 15°C, at this time, the feeding speed of the feeding unit 1 to the pre-oxidized felt is controlled to be 10 to 14 m / h, and then the spraying amount of the humidifying unit 2 is set to 180 to 280 g / m 2 At this time, by reducing the amount of soft water sprayed on the pre-oxidation felt per unit area, the moisture content of the pre-oxidation felt is reduced, reducing the rapid cooling caused by excessive moisture.

[0062] The upper temperature of the first temperature rising zone 31 is increased by 8-12°C on the basis of the original temperature, and the lower temperature of the first temperature rising zone 31 is increased by 6-10°C on the basis of the original temperature. That is, at this time, the first temperature rising zone 31 is closest to the feed inlet of the pre-oxidation felt, so it needs to be heated to avoid a sharp drop in temperature in this temperature zone after water evaporation and heat absorption.

[0063] Adjust the upper and lower temperatures of the second heating zone 32 to the original temperature, i.e. 228°C. At this time, the temperature of the preoxidation felt is lower after being cooled in the first heating zone 31 (i.e., the temperature difference between the second heating zone 32 and the first heating zone 31 is not very obvious at this time), so there is no need to perform heating operation again.

[0064] At this time, since the temperature difference between the second heating zone 32 and the first heating zone 31 is small, the third heating zone 33 is heated up and down, and the heating temperature is 204°C, which can achieve the pre-oxidation felt to enter the reaction temperature.

[0065] Similarly, the fourth temperature rising zone 34 and the fifth temperature rising zone 35 are also operated at normal temperatures.

[0066] S7, such as Figure 5 As shown, when the temperature in the over-temperature zone drops to within 2 to 5°C of the preset temperature, the feeding speed of the pre-oxidation felt by the feeding unit 1 is 10 to 14 m / h (slightly lower than 18 m / h at the stable temperature), which remains unchanged with S6, and then the atomizing spray of the humidifying unit 2 is turned off, that is, by reducing the feeding speed.

[0067] The upper temperature of the first temperature rising zone 31 is set to increase by 4-6°C on the basis of the original temperature, and the lower temperature is set to increase by 4-6°C on the basis of the original temperature. At this time, the first temperature rising zone 31 is closest to the feed port of the pre-oxidation felt, so it needs to be heated to avoid a sharp drop in temperature in this temperature zone after water evaporation and heat absorption.

[0068] Adjust the upper and lower temperatures of the second temperature rising zone 32 to the original temperature, i.e., 228° C.;

[0069] At this time, the third temperature rising zone 33, the fourth temperature rising zone 34 and the fifth temperature rising zone 35 all keep their original temperatures unchanged.

[0070] S8, when the temperature in the over-temperature zone drops to within 0-2°C of the preset temperature, at this time, the feeding speed of the feeding unit 1 is adjusted to 20-26 m / h, by increasing;

[0071] And simultaneously adjust the upper and lower temperatures of the first temperature rising zone 31 to a preset temperature of 192°C;

[0072] At this time, the temperatures of the second temperature rising zone 32 , the third temperature rising zone 33 , the fourth temperature rising zone 34 , and the fifth temperature rising zone are all restored to the designated preset temperatures.

[0073] S9. When the temperature in the super-temperature zone drops and stabilizes to the preset temperature, the feed speed of the pre-oxidation felt is restored to 18m / h, and the temperature of each heating zone is adjusted to the preset temperature, that is, the temperature control temperature of the first heating zone 31 is 192°C, the temperature control temperature of the second heating zone 32 is 228°C, the temperature control temperature of the third heating zone 33 is 204°C, the temperature control temperature of the fourth heating zone 34 is 150°C, and the temperature control temperature of the fifth heating zone is 135°C.

[0074] The whole device and method uses a non-protective atmosphere pre-oxidation furnace to produce pre-oxidation felt, which saves water vapor or nitrogen and can save a lot of energy consumption costs. Through this cooling measure, the temperature of the out-of-control temperature zone can be reduced in time to avoid high temperature burning of the pre-oxidation felt or interruption of production.

[0075] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A cooling device for a pre-oxygenation furnace without protective atmosphere, characterized in that: It comprises a feeding unit (1), a humidifying unit (2) and a pre-oxygenation furnace unit; The feeding unit (1) is used to feed the preoxidation felt and control the speed at which the preoxidation felt enters the preoxidation furnace unit; The humidifying unit (2) is located above the feeding unit (1), and the humidifying unit (2) is used to spray and cool the pre-oxidized felt above the feeding unit (1); A plurality of temperature rising zones are arranged in the pre-oxygenation furnace unit, and each of the temperature rising zones is independently temperature controlled.

2. The cooling device of the non-protective atmosphere pre-oxygenation furnace according to claim 1 is characterized in that: The humidifying unit (2) is arranged horizontally above the feeding unit (1). By controlling the spray head added to the humidifying unit (2), an atomized spray is formed above the preoxidation felt. When the temperature is lowered, the spraying amount is controlled to be 360-720 g / m 2 .

3. The cooling device for the pre-oxygenation furnace without protective atmosphere according to claim 2, characterized in that: The feed inlet and the discharge outlet of the pre-oxidation furnace unit are both provided with air suction hoods (301); A transmission component (302) is built into the pre-oxidation furnace unit and runs through multiple temperature-raising zones for transmitting the pre-oxidation felt.

4. The cooling device for the pre-oxygenation furnace without protective atmosphere according to claim 1, characterized in that: The temperature rising zones include a first temperature rising zone (31), a second temperature rising zone (32), a third temperature rising zone (33), a fourth temperature rising zone (34), and a fifth temperature rising zone (35), which are arranged in sequence from right to left.

5. The cooling device for the pre-oxygenation furnace without protective atmosphere according to claim 4, characterized in that: A heating device and a temperature control device are independently provided at the upper and lower ends of the first temperature rising zone (31), the second temperature rising zone (32), and the third temperature rising zone (33).

6. The cooling device for the pre-oxygenation furnace without protective atmosphere according to claim 4, characterized in that: A temperature control device is provided at the lower end where the fourth temperature rising zone (34) and the fifth temperature rising zone (35) are located.

7. The control method of the cooling device of the non-protective atmosphere pre-oxygenation furnace according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. First, the feeding unit (1) and the preoxidation furnace unit use the set temperature to transfer and heat the preoxidation felt. When the temperature of any temperature rising zone exceeds the preset temperature by more than 20° C., the feeding speed of the preoxidation felt through the feeding unit (1) is reduced to 5-10 m / h; S2, open the spray head of the humidification unit (2), so that the soft water sprayed by atomization forms a surface covering of the pre-oxidized felt, and control the spraying amount of the soft water to be 360-720 g / m 2 ; S3, setting the upper temperature of the first temperature rising zone (31) to increase by 10-15°C based on the original temperature, and setting the lower temperature of the first temperature rising zone (31) to increase by 8-13°C based on the original temperature; S4, setting the upper temperature of the second temperature rising zone (32) to increase by 5 to 8° C. based on the original temperature, and setting the lower temperature of the second temperature rising zone (32) to increase by 5 to 8° C. based on the original temperature; S5, closing the upper temperature and the lower temperature of the third temperature rising zone (33), while the fourth temperature rising zone (34) and the fifth temperature rising zone (35) continue to heat at the original temperature; S6. When the temperature in the over-temperature zone drops and stabilizes to the preset temperature, the feed speed is restored to 18m / h, and the temperature of each heating zone is adjusted to the preset temperature.

8. The control method of the cooling device of the non-protective atmosphere pre-oxygenation furnace according to claim 7 is characterized in that: In S6, when the temperature in the over-temperature zone drops to the preset temperature range of 5 to 15°C, the feeding speed of the feeding unit (1) to the preoxidized felt is controlled to be 10 to 14 m / h, and then the spraying amount of the humidifying unit (2) is set to 180 to 280 g / m 2 ; The upper temperature of the first temperature rising zone (31) is increased by 8 to 12°C based on the original temperature, and the lower temperature of the first temperature rising zone (31) is increased by 6 to 10°C based on the original temperature; Adjusting the upper temperature and the lower temperature of the second temperature rising zone (32) to the original temperature, i.e. 228°C; The upper heating and the lower heating of the third temperature rising zone (33) are turned on at the same time to heat the room, and the heating temperature at this time is 204°C.

9. The control method of the cooling device of the non-protective atmosphere pre-oxygenation furnace according to claim 8, characterized in that: In S6, when the temperature of the over-temperature zone drops to within 2-5°C of the preset temperature, the feeding speed of the feeding unit (1) for the preoxidation felt is 10-14 m / h; Then, the atomizing spray of the humidifying unit (2) is turned off; The upper temperature of the first temperature rising zone (31) is set to increase by 4 to 6°C based on the original temperature, and the lower temperature is set to increase by 4 to 6°C based on the original temperature. Adjusting the upper temperature and the lower temperature of the second temperature rising zone (32) to the original temperature, i.e. 228°C; At this time, the temperature of the third temperature rising zone (33) is adjusted to the original temperature of 204°C.

10. The control method of the cooling device of the non-protective atmosphere pre-oxygenation furnace according to claim 9, characterized in that: In S6, when the temperature of the super-temperature zone drops to within 0 to 2°C of the preset temperature, the feeding speed of the feeding unit (1) is adjusted to 20 to 26 m / h; and simultaneously adjusting the upper and lower temperatures of the first temperature rising zone (31) to 192° C.; At this time, the temperatures of the second temperature rising zone (32) and the third temperature rising zone are adjusted to the original temperatures.

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