JP5512326B2 - Metal cooling device and metal cooling method - Google Patents

Description

  The present invention relates to a metal cooling device and a cooling method, and more particularly, to a metal cooling device and a metal cooling method for cooling a metal coil without causing condensation on a hot-rolled metal coil placed indoors. .

  Hot rolling and cold rolling are performed on the metal slab in order to obtain a uniform metal strip having high strength from the metal slab (rolling ingot). Usually, the hot rolling is performed at a relatively high temperature that is equal to or higher than the recrystallization temperature of the target metal (for example, 300 ° C. to 600 ° C. when aluminum is used), and the cold rolling is performed at a normal temperature or a recrystallization temperature. It is done in the following.

  In the cold rolling performed after hot rolling, the effect (improvement of strength and improvement of surface characteristics) cannot be obtained unless the target metal is sufficiently cooled. Therefore, the process which cools a metal between hot rolling and cold rolling is needed.

  Currently, when cooling a metal coil after hot rolling (coiled strip-shaped metal obtained by hot rolling), cooling by natural heat dissipation or blowing the metal coil with a blower or the like Cooling is taking place. However, in cooling by natural heat dissipation, it takes an enormous amount of time to lower the temperature of the metal coil after hot rolling to a temperature at which the effect of cold rolling can be obtained. As a result, the production efficiency of the final product is significantly reduced.

Further, even if cooling is performed by applying air to the metal coil, a cooling effect that can sufficiently shorten the cooling time cannot be obtained.
Here, although the objects to be cooled differ greatly, the following cooling method using mist has been proposed as a cooling method with a high cooling effect.

  The invention which concerns on patent document 1 injects the mist to the windward vicinity of the air blower attached to the wall of the building for livestock, and the outside air from which the heat of vaporization was deprived by mist vaporizing in a building by a fan It takes in and cools the inside of the building.

  In the invention according to Patent Document 2, the installation position of the injection nozzle is set in accordance with the particle size of the mist injected from the upper part of the room (when the particle size of the mist is large, the installation position of the injection nozzle is increased). If the particle size of the mist is small, the installation position of the injection nozzle is lowered), and the temperature in the room is lowered without wetting the person existing in the room.

JP-A-8-42870 JP 2006-177578 A

  However, since the invention which concerns on patent document 1 is the structure of taking in the mist injected by the upwind part of the air blower directly in a building with an air blower, outside air is in the state which is not fully vaporized. It will be taken into the building. Therefore, the invention which concerns on patent document 1 cannot prevent that mist adheres to the target object in a building.

  Moreover, since the invention which concerns on patent document 1 has provided the nozzle which injects mist outside a building, most of the injected mist will be scattered outside a building, without being taken in into an air blower. Therefore, the invention according to Patent Document 1 has poor mist utilization efficiency.

  In the invention according to Patent Document 2, the amount of heat of vaporization is very small because mist is injected from the upper part of the room and vaporized in a short time until the mist hits a person existing in the room. Therefore, the invention according to Patent Document 2 cannot provide a sufficient cooling effect.

  In addition, the invention according to Patent Document 1 and Patent Document 2 is a cooling device for a space where livestock and humans exist, and is a technology in a field where strictness for preventing wetting (condensation) is not required. is there. Therefore, these techniques cannot be used as they are in the metal cooling field where condensation is likely to occur and chemical corrosion such as rust is likely to occur.

  Therefore, the object of the present invention is to prevent the mist from adhering to the metal coil and the occurrence of condensation when cooling the metal coil after hot rolling, and the use efficiency of the mist is good and sufficient. The object is to provide a metal cooling device and a metal cooling method having a cooling effect.

  In order to solve the above problems, a metal cooling device according to the present invention is a metal cooling device that cools a rolled metal coil placed in a room, and a blower that sends outside air from the outside into the room, and the blower And an outside air introduction chamber that guides outside air to the blower, a duct that is installed to communicate between the blower and the room, and guides the outside air sent by the blower to the room, Mist supply for supplying mist to the outside air introduction chamber so as to cover at least one filter installed so as to cover the opening through which the outside air is introduced, and a nozzle installed outside the filter in the outside air introduction chamber. Means, an outdoor temperature measuring means for measuring the temperature of the outdoor air outside the room (outside air temperature T1), and a humidity (outside air humidity H1) of the outdoor air outside the room. An outside humidity measuring means for measuring, a humidity measuring means for measuring the humidity in the duct (humidity H2 in the duct), and a control device for controlling the driving of the mist supply means, the control device comprising: When the outside air temperature T1 is smaller than the outside air temperature judgment reference value T1 ′ (T1 ≦ T1 ′), when the outside air humidity H1 is larger than the outside air humidity judgment reference value H1 ′ (H1 ≧ H1 ′), and the inside humidity of the duct When H2 is larger than the duct humidity determination reference value H2 ′ (H2 ≧ H2 ′), the mist supply by the mist supply means is stopped when any one of the conditions is satisfied.

According to the said structure, the mist injected from the nozzle can be made to adhere to the said filter because the filter is installed in the external air introduction chamber.
Further, since the nozzle is installed in the outside air introduction chamber, mist can be injected in the outside air introduction chamber.
Further, by providing the control device, it is possible to control the driving of the mist supply means based on the outside air temperature, the outside air humidity, and the duct internal humidity measured by the measuring means.

  In the metal cooling device according to the present invention, the outside air temperature judgment reference value T1 ′ is 25 ° C., the outside air humidity judgment reference value H1 ′ is 85%, and the duct humidity judgment reference value H2 ′ is 60%. Features.

  According to the said structure, when outside temperature is lower than a reference value, since it is not necessary to cool outside air, supply of mist is stopped and excessive mist injection can be prevented. In addition, according to the above configuration, when the outside air humidity or the humidity in the duct is higher than the reference value, the supply of mist is stopped in order to avoid the adhesion of mist to the metal coil and the occurrence of dew condensation. Injection can be prevented.

  The metal cooling device according to the present invention is a metal cooling device that cools a rolled metal coil placed in a room, and a blower that sends outside air from the outside into the room, and the blower communicates with the outside. An outside air introduction chamber that is installed to guide the outside air to the blower, a duct that is installed so as to communicate the blower and the room, and that guides outside air sent by the blower to the room; At least one filter installed so as to cover the opening to be introduced, mist supply means for supplying mist to the nozzle installed in the outside air introduction chamber and outside the filter, and placed in the room Further, a metal temperature measuring means for measuring the temperature of the metal coil (metal temperature T2) and the indoor dew point temperature (indoor dew point temperature T3) are measured. An internal dew point temperature measuring means and a control device for controlling the driving of the mist supply means, wherein the control device is such that the metal temperature T2 and the indoor dew point temperature T3 are T2−T3 ≦ dew point monitoring temperature T23 ′. When the condition is satisfied, supply of mist by the mist supply means is stopped.

  According to the said structure, by providing the control apparatus, the drive of a mist supply means can be controlled based on the metal temperature measured by the measurement means, and indoor dew point temperature.

The metal cooling device according to the present invention is characterized in that the dew point monitoring temperature T23 ′ is 3 ° C.
According to the above configuration, when the difference between the metal temperature and the room dew point temperature (the temperature at which condensation occurs) is lower than the reference value, the supply of mist is stopped in order to avoid the occurrence of condensation on the metal coil. Mist injection can be prevented.

  In the metal cooling device according to the present invention, the metal coils are installed in a row on the first mounting table provided on the floor surface in the room so that the coil axial directions of the metal coils are substantially parallel (first installation). And a second mounting table further provided above the first mounting table, the coil axis direction of the metal coil is installed in a row (second installation position), The outside air discharge port of the duct is provided so that the approximate center of the outside air discharge port is located on the respective coil axis of the metal coil aligned with the first installation position and the second installation position, and the metal coil It is provided so that external air may be blown in the substantially coil axial direction.

  According to the said structure, the external air discharge port of a duct is provided so that external air may be sprayed separately with respect to several metal coils. Further, the outside air discharge port of the duct is provided so as to blow outside air in the coil axis direction with respect to the coil axis center of the metal coil. Therefore, the cooled outside air can be appropriately blown against the metal coil.

The metal cooling device according to the present invention has one or more air volume adjusting means for opening and closing the air passage with a partition plate in the air passage of the duct.
According to the said structure, in the ventilation path of a duct, the state which lets external air pass and the state which does not let it pass can be changed freely. Therefore, when there are a plurality of metal coils and some of the metal coils are sufficiently cooled, it is possible to prevent the outside air from being blown onto the metal coils.

The metal cooling device according to the present invention is characterized in that the outside air outlet has an air direction adjusting means capable of adjusting the air direction of the outside air.
According to the said structure, since the wind direction of the external air discharged from the external air discharge port of a duct can be adjusted, external air can be sprayed more appropriately to a metal coil.

  The metal cooling method according to the present invention is a metal cooling method for cooling a rolled metal coil placed in a room, and the outside air supplied with mist by a mist supply means is blown to the blower and the room using a blower. And blowing to the metal coil through a duct communicating with the outside, and measuring outdoor outdoor temperature (outside air temperature T1), outdoor outdoor humidity (outside air humidity H1), and humidity inside the duct (inside duct humidity H2). When the outside air temperature T1 is smaller than the outside air temperature judgment reference value T1 ′ (T1 ≦ T1 ′), and when the outside air humidity H1 is larger than the outside air humidity judgment reference value H1 ′ (H1 ≧ H1 ′), When the duct internal humidity H2 is larger than the duct internal humidity determination reference value H2 ′ (H2 ≧ H2 ′), the mist supplied by the mist supply means is satisfied. Characterized by stopping the supply.

  According to the above method, when the outside air temperature is lower than the reference value, it is not necessary to cool the outside air, so that the supply of mist is stopped and excessive mist injection can be prevented. Further, according to the above method, when the outside air humidity or the humidity in the duct is higher than the reference value, the supply of mist is stopped in order to avoid the adhesion of mist to the metal coil and the occurrence of dew condensation. Injection can be prevented.

  The metal cooling method according to the present invention is a metal cooling method for cooling a rolled metal coil placed in a room, and the outside air supplied with mist by a mist supply means is blown to the blower and the room using a blower. Spraying the metal coil through a duct communicating with the metal coil, and measuring the temperature of the metal coil placed in the room (metal temperature T2) and the dew point temperature of the room (room dew point temperature T3), When the metal temperature T2 and the indoor dew point temperature T3 satisfy the condition of T2-T3 ≦ dew point monitoring temperature T23 ′, the supply of mist by the mist supply means is stopped.

  According to the above method, when the difference between the metal temperature and the room dew point temperature (the temperature at which condensation occurs) is lower than the reference value, the supply of mist is stopped and excessive in order to avoid the occurrence of condensation on the metal coil. Mist injection can be prevented.

According to the metal cooling device and the metal cooling method of the present invention, since the supply of mist is controlled based on each judgment reference value, when cooling the metal coil after hot rolling, adhesion of mist to the metal coil, Further, the occurrence of condensation can be prevented.
Further, since the nozzle is installed in the outside air introduction chamber, most of the injected mist is introduced into the room, so that the mist utilization efficiency is good.
Furthermore, since the filter is installed in the outside air introduction chamber, the sprayed mist adheres to the filter and vaporizes on the filter. As a result, the introduction of mist into the room is prevented, and a sufficient cooling effect can be obtained by taking a lot of heat of vaporization from the outside air passing through the filter.

According to the metal cooling device of the present invention, the outside air outlet of the duct is provided so as to blow outside air in the coil axis direction with respect to the coil axis center of the metal coil, and the air direction adjusting means is provided at the outside air outlet. By being installed, external air can be appropriately blown against the metal coil.
In addition, by providing an air volume adjusting means in the air passage of the duct, it is possible to prevent the outside air from being blown against some of the metal coils (metal coils that do not need to be cooled). .

It is a mimetic diagram showing the whole composition of the metal cooling device concerning the embodiment of the present invention. It is a block diagram of the control apparatus which concerns on embodiment of this invention. It is a perspective view showing typically an outside air introduction chamber, a filter, a nozzle, a mist supply unit, a mist supply hose, and a wind pressure measurement unit according to an embodiment of the present invention. It is a perspective view showing typically a duct concerning an embodiment of the present invention. It is a flowchart which shows the control means (1st procedure: the case where only a "stop" signal is output) of the metal cooling device and metal cooling method which concern on embodiment of this invention. It is a flowchart which shows the control means (1st procedure: the case where a "start / stop" signal is output) of the metal cooling device and metal cooling method which concern on embodiment of this invention. It is a flowchart which shows the control means of the metal cooling device and metal cooling method which concern on embodiment of this invention (when the 1st procedure: "start / stop / supply with little supply amount mist supply" signal is output). It is a flowchart which shows the control means (1st procedure: the case where a "start / stop" signal is output based on two conditions) of the metal cooling device and metal cooling method which concern on embodiment of this invention. It is a flowchart which shows the control means (2nd procedure: the case where only a "stop" signal is output) of the metal cooling device and metal cooling method which concern on embodiment of this invention. It is a flowchart which shows the control means (2nd procedure: the case where a "start / stop" signal is output) of the metal cooling device and metal cooling method which concern on embodiment of this invention. It is a flowchart which shows the control means of the metal cooling device and metal cooling method which concern on embodiment of this invention (when a 2nd procedure: "start / stop / mist supply with little supply amount" signal is output).

First, a metal cooling device according to the present invention will be described in detail with reference to the drawings.
[Metal cooling device]
The metal cooling device of the present invention will be described based on FIG. 1, FIG. 2, FIG. 3, and FIG. The metal cooling device mainly includes a blower 101, an outside air introduction chamber 102, a mist supply unit 103, a nozzle 104, a duct 105, a filter 106, measurement units 107, 108, 109, 110, 111, and a control device 201. .

[Blower]
The blower 101 is a device that sends outside air into the room from the outside. The size and shape of the blower 101 are not particularly limited.
In addition, although it does not specifically limit about the ventilation speed and ventilation volume of the air blower 101, if the ventilation speed is increased or the ventilation volume is increased, the mist attached to the filter 106 is vaporized in a large amount in a short time. And the cooling capacity of the metal cooling device can be improved. Therefore, it is preferable that the blowing speed is high, and it is preferable that the blowing volume is large.

[Outside air introduction chamber]
The outside air introduction chamber 102 guides outside air to the blower. Therefore, the outside air introduction chamber 102 is provided so as to communicate with the blower 101 and the outside.
The size and shape of the outside air introduction chamber 102 are not particularly limited as long as the nozzle 104 and the filter 106 can be installed in the outside air introduction chamber 102.

  The material of the outside air introduction chamber 102 is preferably one having corrosion resistance or being coated with a material having corrosion resistance in order to inject mist in the outside air introduction chamber 102.

[Mist supply means]
The mist supply means 103 supplies water and air or only water (hereinafter referred to as water or the like) to the nozzle 104 in order to inject mist that is fine water particles from the nozzle 104.

  The form in which water or the like is supplied by the mist supply means 103 may be a form in which pressurized water and compressed air collide in the nozzle 104, or a form in which only pressure-applied water is supplied to the nozzle 104. But you can.

[nozzle]
The nozzle 104 ejects water or the like supplied from the mist supply means 103 as mist. The installation place of the nozzle 104 is in the outside air introduction chamber 102 and is outside (windward) from the filter 106 installed in the outside air introduction chamber 102.

  The number of nozzles 104 is determined based on the size of the opening for introducing outside air in the outside air introduction chamber 102 and the amount of air blown per unit time of the blower 101 (if the opening is large, if the amount of air blown is large, Increase the number of installations).

  The installation direction of the nozzle 104 is not particularly limited, but it is preferable to install the nozzle 104 so as to inject mist in the same direction as the direction in which the outside air is introduced. By installing in this direction, it is possible to prevent the mist from scattering outside, and almost all the injected mist is introduced into the outside air introduction chamber 102.

The structure of the nozzle 104 is preferably such that the particle size of the injected mist is small. This is because when the same amount of water is injected as a mist having a large particle diameter or a mist having a small particle diameter, the surface area in contact with the air is increased and vaporization is facilitated when the water is injected as a small mist.
In addition, it is preferable that the particle diameter of the mist injected from the nozzle 104 is 300 μm or less.

[duct]
The duct 105 guides the outside air introduced from the blower 101 into the room. Therefore, the duct 105 is provided so as to communicate with the blower 101 and the room.
It is preferable to provide a plurality of outside air outlets 116 of the duct 105 so that the plurality of metal coils 112 can be cooled.

  For example, as shown in FIG. 1, when the metal coils 112 are installed in a row on the first mounting table 114 and the second mounting table 115, the outside air discharge ports 116 are arranged on the respective coil axes of the metal coils 112. The outside air outlet 116 of the duct 105 may be provided so that the approximate center is located. Further, the outside air discharge port 116 of the duct 105 may be provided so as to blow outside air substantially in the direction of the coil axis of the metal coil.

  Since the duct 105 passes outside air with high humidity and is installed near a high-temperature metal coil, the duct 105 is coated with a material having corrosion resistance / heat resistance or a material having corrosion resistance / heat resistance. It is preferred that

  Note that a dehumidifying means (dehumidifier / dehumidifying agent) capable of lowering the humidity may be provided in the duct 105. For example, a dehumidifying agent (silica gel, activated carbon, etc.) is enclosed, and a box having pores in the wall portion is installed in the duct 105 so that outside air can pass through, or a dehumidifying sheet composed of silica gel, activated carbon, etc. is installed in the duct 105. It can be installed to be attached to the inner wall.

[filter]
The filter 106 prevents the mist from being introduced into the room by adhering the mist contained in the outside air to be introduced onto the filter 106 and introduces the mist by vaporizing the adhering mist on the filter 106. Plays the role of cooling the outside air.

  The installation location of the filter 106 is in the outside air introduction chamber 102, and is closer to the blower 101 (downward side) than the installation location of the nozzle 104 installed in the outside air introduction chamber 102. Further, it may be provided not only in the outside air introduction chamber 102 but also in the duct 105.

  The size of the filter 106 only needs to be large enough to cover the opening through which the outside air is introduced in order to pass all the outside air to be introduced. Further, the filter 106 may have any shape such as a flat surface, a spherical surface, and an aspherical surface.

  About the material of the filter 106, since mist adheres to the filter 106 surface, it is preferable to be comprised with the material with corrosion resistance. For example, a filter 106 made of a polyester material is used.

About the hole of the filter 106, in order to prevent that mist introduce | transduces into a room | chamber interior, the smaller one is preferable.
Further, the number of the filters 106 to be installed is not particularly limited, but a larger number is preferable from the viewpoint of preventing the mist from being introduced into the room.
In addition, when installing the several filter 106, you may use the thing from which a hole diameter differs. For example, a filter 106 having a large hole diameter may be provided on the leeward side, and a filter 106 having a small hole diameter may be provided on the leeward side.

  The filter 106 may be one that measures the ventilation state of the filter 106 and automatically replaces the filter 106 when the ventilation state of the filter 106 is poor. Specifically, the wind pressure measuring means 302 is provided behind the filter 106 (downward), and when the wind pressure becomes a certain value or less, it is determined that the filter 106 is in a defective state such as clogging, and A new filter 106 installed in a roll shape is made to flow downward to replace the defective filter 106, and the defective filter 106 is made to flow downward and accommodated in a roll shape below.

[Measuring means]
The outside air temperature measuring means 107, the outside air humidity measuring means 108, the duct inside humidity measuring means 109, the metal temperature measuring means 110, and the indoor dew point temperature measuring means 111 will be described with reference to FIG. The measuring means measures temperature, humidity, and dew point temperature.

  The outside temperature measuring means 107 is not particularly limited as long as it has a function of measuring temperature. The installation location is preferably in front of the outside air introduction chamber 102 (windward side) so that the temperature of the outside air to be introduced can be measured.

  The outside air humidity measuring means 108 is not particularly limited as long as it has a function of measuring humidity. The installation location is preferably in front of the outside air introduction chamber 102 (windward side) so that the humidity of the outside air to be introduced can be measured.

  The duct humidity measuring means 109 is not particularly limited as long as it has a function of measuring humidity. The installation location may be in the duct 105, but in particular, it is preferably provided near the outside air outlet 116 so that the humidity of the outside air discharged from the outside air outlet 116 of the duct 105 can be measured.

The metal temperature measuring means 110 is not particularly limited as long as it has a function of measuring the temperature of the metal coil 112. For example, when the measurement is performed in contact with the metal coil 112 (contact type), a thermocouple or the like is used, and when the measurement is performed without contact with the metal coil 112 (non-contact type), an infrared temperature sensor or the like may be used.
In the case of the contact type, when the metal coil 112 is installed on the mounting table, the mounting table (the first mounting table 114 and the second mounting table 115) so that the metal coil 112 and the metal temperature measuring means 110 are in contact with each other. What is necessary is just to attach the metal temperature measurement means 110 to.

  The indoor dew point temperature measuring means 111 is not particularly limited as long as it has a function of measuring the dew point temperature. The installation location is not a problem as long as it is indoors, but it may be installed inside a duct 105 installed indoors.

[Control device]
The control device 201 compares the outside air temperature T1, the outside air humidity H1, and the duct inside humidity H2 with the judgment reference values (the outside air temperature judgment reference value T1 ′, the outside air humidity judgment reference value H1 ′, and the duct inside humidity judgment reference value H2 ′). Based on the relationship, the relationship between the metal temperature T2 and the indoor dew point temperature T3 (T2-T3 ≦ dew point monitoring temperature T23 ′), the driving of the mist supply means 103 is controlled.

  The control device 201 includes, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), an HDD (Hard Disk Drive), an input / output interface, and the like. The control device 201 mainly includes an input unit 202, a processing unit 203, a storage unit 204, and an output unit 205 in order to realize a control function described later.

  The input unit 202 includes data (T 1, H 1, H 2, data output from the outside air temperature measuring means 107, the outside air humidity measuring means 108, the duct humidity measuring means 109, the metal temperature measuring means 110, and the indoor dew point temperature measuring means 111. T2, T3) are input to the processing unit 203.

  The processing unit 203 compares the data input from the input unit 202 with the data (T1 ′, H1 ′, H2 ′, T23 ′) input from the storage unit 204, and processes the result (mist supply unit 103). The result of controlling the driving of the output is output to the output unit 205.

The storage unit 204 stores and saves an outside air temperature determination reference value T1 ′, an outside air humidity determination reference value H1 ′, a duct internal humidity determination reference value H2 ′, a dew point monitoring temperature T23 ′, and the like. In addition, the storage unit 204 outputs data to be stored / saved to the processing unit 203. Note that the data may be manually input into the storage unit 204 using an input unit (not shown) such as a keyboard or a mouse.
The output unit 205 outputs the result input from the processing unit 203 to the mist supply unit 103.

The metal cooling device may further include air volume adjusting means 401 and air direction adjusting means 402. First, the air volume adjusting means 401 will be described with reference to FIGS.
[Air volume adjustment means]
The air volume adjusting means 401 adjusts the amount of outside air passing through the duct 105 at a predetermined position in the duct 105. The structure of the air volume adjusting means 401 is not particularly limited, but is configured such that a partition plate is rotatably provided at an intermediate position in the height direction of the air passage of the duct 105 (or an intermediate position in the width direction). Good. In the installation location of the air volume adjusting means 401, when the outside air is allowed to pass, the partition plate is made parallel to the blowing direction, and when the outside air is not allowed to pass, the partition plate may be made perpendicular to the ventilation direction. Further, the air flow rate can be adjusted by adjusting the angle of the partition plate with respect to the air blowing direction.

  For example, when there are a plurality of metal coils 112 to be cooled and the temperatures of some of the metal coils 112 are sufficiently low, the air volume adjusting means 401 does not blow outside air on the metal coils 112. Can be.

  If it demonstrates in detail using FIG. 1, the metal coil 112 installed in the 1st mounting stand in a row will be the stay coil 112 (coil which time passed sufficiently after hot rolling and was cooled), for example. On the other hand, when the metal coil 112 installed in a row on the second mounting table is the coil 112 immediately after hot rolling, the air volume adjustment provided in the lower duct 105 immediately after branching up and down is provided. The means 401 may prevent outside air from passing through the lower duct 105 (the partition plate is perpendicular to the ventilation direction).

In addition, as shown in FIG. 4, one each may be provided near each outside air outlet 116 so that the amount of outside air discharged from the outside air outlet 116 of the duct 105 can be adjusted.
The air volume adjusting means 401 may be manual or electric.

Next, the wind direction adjusting means 402 will be described with reference to FIG.
[Wind direction adjusting means]
The wind direction adjusting means 402 is for adjusting the wind direction of the outside air discharged from the outside air discharge port 116 of the duct. The structure of the wind direction adjusting means 402 is a structure in which elongated slats are arranged in parallel to the outside air discharge port 116 at a predetermined interval. The wind direction adjusting means 402 is installed in the vicinity of the outside air outlet 116 of the duct 105. Note that the wind direction can be adjusted vertically and horizontally by providing the wind direction adjusting means 402 vertically and horizontally.

A metal to be cooled by the metal cooling device will be described with reference to FIG.
[Metal to be cooled]
As long as the metal to be cooled is a metal whose temperature needs to be lowered, the type and shape of the metal are not limited. However, among the metals that need to be lowered in temperature, the metal coil 112 that has been hot rolled by the rolling roll 117 needs to be greatly lowered in temperature before cold rolling, and in addition, is a coil that is difficult to dissipate heat. This is particularly effective because of the structure.

A metal to be measured by the metal temperature cooling means 110 of the metal cooling device will be described with reference to FIG.
[Metal to be measured by metal temperature measuring means]
The metal coil 112 measured by the metal temperature measuring means 110 may be targeted for all the metal coils 112 installed in the room (or a plurality of metal coils 112), or any one of the metal coils 112 may be targeted. It is good.

  When a plurality of metal coils 112 are targeted, the processing unit 203 determines the lowest metal temperature T2 among the metal temperatures T2 input from the plurality of metal temperature measuring means 110 to the input unit 202 of the control device 201. The selection and subsequent comparison processing may be performed.

  Moreover, when targeting any one metal coil 112, it is preferable to target a metal coil having a low temperature among the metal coils 112 installed in the room. This is because the lower the temperature, the closer to the indoor dew point temperature and the easier the condensation occurs. For example, if there is a coil 112 and a staying coil 112 immediately after hot rolling, the staying coil 112 may be measured.

Further, a configuration may be adopted in which a dummy coil 113 (a temperature measuring coil that is always installed in the room) is installed in the room, and the temperature of the dummy coil 113 is measured by the metal temperature measuring means 110. By adopting such a configuration, it is not necessary to directly measure the metal coil 112 that is a product, so damage such as wrinkles on the surface of the metal coil 112 that occurs when the metal temperature measuring means 110 is attached to the metal coil 112 is prevented. It can be avoided.
In the case where the temperature of the dummy coil 113 is measured by contact-type temperature measuring means such as a thermocouple, an electric drill is provided on the side of the dummy coil 113 in order to accurately measure the temperature (so as not to erroneously measure the ambient temperature). It is preferable to devise so that the dummy coil 113 and the thermocouple are not insulated by air or the like by pressing a thermocouple wrapped with a metal such as aluminum foil into the hole.
The dummy coil 113 is not limited to a coil-shaped one, and may be a laminate of metal sheet materials. If the dummy coil 113 is installed so as to sandwich temperature measuring means such as a thermocouple between the laminate sheets, the metal temperature is set. It can be measured accurately.
Since the dummy coil 113 is always installed indoors, the temperature is lower than that of the coil 112 immediately after hot rolling, and the temperature is lower or the same as that of the staying coil 112. The material of the dummy coil 113 is preferably the same as that of the hot-rolled coil.

The mounting table (the first mounting table 114 and the second mounting table 115) on which the metal is mounted will be described with reference to FIG.
[Mounting table]
The mounting table (the first mounting table 114 and the second mounting table 115) is a table on which the metal coil 112 is mounted. The first mounting table 114 is provided on the floor surface in the room where the metal cooling device is installed, and the second mounting table 115 is provided above the first mounting table 114. The mounting tables 114 and 115 are provided with grooves (not shown) in the substantially coil axis direction so that the metal coil 112 is fixed.
In addition, conventionally, the metal coil 112 has been mounted by two-stage stacking. However, in such a mounting method, wrinkles or the like due to co-shifting occur on the outer peripheral surface of the metal coil 112 and the metal coil 112, The problem of a drop in yield occurred. In addition, a process of inspecting the wrinkles by co-displacement and a process of removing the wrinkles are necessary, and there is a problem of cost increase due to an increase in the number of processes. However, since the mounting table according to the present invention is composed of the first mounting table 114 and the second mounting table 115, the above problem is avoided because wrinkles such as two-stage stacking do not occur. Is possible.

  The first mounting table 114 and the second mounting table 114 are positioned so that the approximate center of the outside air outlet 116 is positioned on the coil axis of each of the metal coils 112 mounted on the first mounting table 114 and the second mounting table 115. A mounting table 115 is preferably provided. Furthermore, it is preferable to provide the first mounting table 114 and the second mounting table 115 so that the outside air from the outside air discharge port 116 is blown to the metal coil 112 substantially in the coil axis direction.

Since the metal coil 112 often has a high temperature, it is preferable to provide the first mounting table 114 and the second mounting table 115 so that the distance between the outside air discharge port 116 and the metal coil 112 is 1 m or more.
In addition, when the outside air discharge ports 116 of the duct 105 are present in three rows in the vertical direction, a third mounting table (not shown) may be further provided above the second mounting table 115, or the outside air discharge ports 116 may be provided. When there is only one line in the vertical direction, only the first mounting table 114 may be provided.

Next, a control procedure (first procedure) of the metal cooling device and the metal cooling method according to the present invention will be described with reference to FIGS. 5, 6, 7, and 8.
[Control procedure (first procedure)]
First, the outside air temperature T1, the outside air humidity H1, and the inside duct humidity H2 are input to the input unit 202 from the outside air temperature measuring unit 107, the outside air humidity measuring unit 108, and the duct inside humidity measuring unit 109 (step S11). With respect to the processing unit 203, the data of the outside air temperature T 1, the outside air humidity H 1, and the duct inside humidity H 2 from the input unit 202, and the outside air temperature judgment reference value T 1 ′, the outside air humidity judgment reference value H 1 ′, and the duct inside humidity judgment standard from the storage unit 204 Data of the value H2 ′ is input, and the processing unit 203 makes a determination based on the data (step S12).

If any of the outside air temperature T1 ≦ the outside air temperature judgment reference value T1 ′, the outside air humidity H1 ≧ the outside air humidity judgment reference value H1 ′, and the inside duct humidity H2 ≧ the inside duct humidity judgment reference value H2 ′, the output unit A "stop" (OFF) signal is output from 205 to the mist supply means 103 (step S13), and the process ends. On the other hand, if none of the outside air temperature T1 ≦ the outside air temperature judgment reference value T1 ′, the outside air humidity H1 ≧ the outside air humidity judgment reference value H1 ′, and the duct inside humidity H2 ≧ the inside duct humidity judging reference value H2 ′, The process ends as it is.
In the above-mentioned case (in the case of FIG. 5), the blower 101 is driven and the mist supply means 103 supplies the mist for the initial state of the device and the like (the drive state of the device and the like before performing the control procedure). It is that.

  It should be noted that a condition of duct internal humidity H2−outside air humidity H1 ≦ 3% may be used instead of duct internal humidity H2 ≧ duct internal humidity determination reference value H2 ′.

  When a “stop” (OFF) signal is input to the mist supply means 103, the supply of mist from the mist supply means 103 is stopped. In addition, when a “stop” (OFF) signal is input to the mist supply unit 103 while the mist supply unit 103 stops the mist supply, the mist supply unit 103 maintains the state where the mist supply is stopped. To do. Even if the mist supply means 103 stops supplying the mist, the blower 101 is driven.

  The outside air temperature determination reference value T1 ′ in step S12 is preferably 23 ° C. to 27 ° C., particularly 25 ° C. By judging with the reference value, excessive mist injection can be prevented when the outside air temperature is low and it is not necessary to cool the outside air. The outside air humidity determination reference value H1 ′ is preferably 83% to 87%, and particularly preferably 85%. By judging based on the reference value, it is possible to prevent the mist from adhering to the metal coil and the occurrence of dew condensation by preventing the mist from being injected when the outside air is sufficiently humid due to rain or the like. it can. The duct humidity reference value H2 ′ is preferably 58% to 62%, particularly 60%. By judging with the reference value, it is possible to prevent the mist from adhering to the metal coil and the occurrence of dew condensation by preventing the outside air from being sprayed on the metal coil.

In step S12 of the above process, if the condition is not satisfied, the process is ended. However, the “start” (ON) signal is output from the output unit 205 to the mist supply unit 103 (step S14), and the process ends. (Fig. 6).
In addition, about the initial state of the apparatus etc. in the above case (in the case of FIG. 6), the blower 101 is driven, and the mist supply unit 103 may be in any state.

  When a “start” (ON) signal is input to the mist supply unit 103, supply of mist from the mist supply unit 103 to the nozzle 104 is started. In addition, when a “start” (OFF) signal is input to the mist supply unit 103 while the mist supply unit 103 is supplying mist, the mist supply unit 103 maintains the state of supplying mist. To do.

  In the above process, “stop” or “start / stop” of the mist supply unit 103 is controlled by one condition (step S12), but two conditions (step S12 and step S15 in FIG. 7) are used. Thus, it is possible to further perform control of “mist supply with a small supply amount”.

Details will be described with reference to FIG. Step S15 is provided between step S12 and step S14. In step S15, the relationship among the outside air temperature T1 ≦ the outside air temperature auxiliary judgment reference value T1 ″, the outside air humidity H1 ≧ the outside air humidity auxiliary judgment reference value H1 ″, and the duct inside humidity H2 ≧ the inside duct humidity auxiliary judgment reference value H2 ″. Is output from the output unit 205 to the mist supply means 103 (step S16), and a signal indicating that “a mist supply of a half of the normal supply amount is performed” is output. If not, a “start” (ON) signal is output (step S14).
Thereby, the metal coil 112 can be more preferably cooled while preventing condensation on the metal coil 112 after hot rolling.
In addition, about the initial condition of the apparatus etc. in the above case (in the case of FIG. 7), the blower 101 is driven and the mist supply means 103 may be in any state.

  When a signal to the effect that “one half of the normal supply amount is supplied” is input to the mist supply unit 103, the supply amount of the mist from the mist supply unit 103 is 1 / of the normal supply amount. 2 quantity. When the signal is input to the mist supply unit 103 in a state where the mist supply unit 103 is supplying a mist that is ½ of the normal supply amount, the mist supply unit 103 has a normal supply amount. The state where the mist supply of 1/2 amount is performed is maintained.

  The outside air temperature auxiliary determination reference value T1 ″ is preferably 28 ° C. to 32 ° C., particularly preferably 30 ° C. The outside air humidity auxiliary determination reference value H1 ″ is preferably 78% to 82%, particularly preferably 80%. The humidity auxiliary judgment reference value H2 ″ in the duct is preferably 53% to 57%, and particularly preferably 55%.

  Further, the mist supply amount in step S16 is not limited to 1/2 of the normal supply amount, and may be 1/4, 3/4, or the like.

  In addition to the above processing, it is also possible to control “start / stop” for the mist supply unit 103 based on two conditions (step S12 and step S17 in FIG. 8).

  Details will be described with reference to FIG. Step S17 is provided between step S12 and step S14. In this step S17, “in the case of the outside air temperature T1> the outside air temperature determination reference value T1 ′ and the outside air humidity H1 <the outside air humidity auxiliary determination reference value H1 ″” and “the outside air temperature T1> the outside air temperature determination reference value T1 ′, In addition, when any of the cases where the humidity in the duct H2 <the case where the auxiliary humidity reference value in the duct H2 ″ is satisfied, an “start” (ON) signal is output from the output unit 205 to the mist supply unit 103 (step S14). ), If none of them applies, a “stop” (OFF) signal is output (step S13).

By providing the condition (step S17), it occurs when the outside air humidity H1 is in the vicinity of the outside air humidity judgment reference value H1 ′ and when the duct inside humidity H2 is in the vicinity of the duct inside humidity judgment reference value H2 ′. Thus, frequent changes of “start” (ON) and “stop” (OFF) of the mist supply means 103 can be avoided.
In addition, about the initial condition of the apparatus etc. in the above case (in the case of FIG. 8), the blower 101 is driven, and the mist supply unit 103 may be in any state.

Next, the control procedure (second procedure) of the metal cooling device and the metal cooling method according to the present invention will be described with reference to FIG. 9, FIG. 10, and FIG.
[Control procedure (second procedure)]
First, the metal temperature T2 and the indoor dew point temperature T3 are input to the input unit 202 from the metal temperature measuring means 110 and the indoor dew point temperature measuring means 111 (step S21). Data of the metal temperature T2 and the indoor dew point temperature T3 is input from the input unit 202 to the processing unit 203, and data of the dew point monitoring temperature T23 ′ is input from the storage unit 204, and the processing unit 203 makes a determination based on the data ( Step S22).

When the relationship between the metal temperature T2 and the indoor dew point temperature T3 satisfies T2-T3 ≦ dew point monitoring temperature T23 ′, a “stop” (OFF) signal is output from the output unit 205 to the mist supply means 103 (step S23). The process ends. On the other hand, when the relationship between the metal temperature T2 and the indoor dew point temperature T3 does not satisfy T2-T3 ≦ dew point monitoring temperature T23 ′, the process ends.
Note that the initial state of the apparatus and the like in the above case (in the case of FIG. 9) is that the blower 101 is driven and the mist supply means 103 is supplying mist.

  When the “stop” (OFF) signal is output to the mist supply unit 103, the supply of mist from the mist supply unit 103 is stopped. In addition, when a “stop” (OFF) signal is output to the mist supply unit 103 while the mist supply unit 103 stops the mist supply, the mist supply unit 103 maintains the state where the mist supply is stopped. To do. Even if the mist supply means 103 stops supplying the mist, the blower 101 is driven.

  The dew point monitoring temperature T23 ′ in step S22 is preferably 2 ° C. to 4 ° C., particularly 3 ° C. By determining based on the reference value, it is possible to prevent excessive mist injection before the temperature of the metal coil falls below the room dew point temperature, and thus it is possible to avoid the occurrence of condensation on the metal coil.

  If the temperatures of the plurality of metal coils 112 are being measured, the lowest metal among the metal temperatures T2 input from the plurality of metal temperature measuring means 110 to the input unit 202 before the process of step S22. The temperature T2 may be selected and the process of step S22 may be performed.

In step S22 of the above process, if the condition is not satisfied, the process ends. However, the "start" (ON) signal is output from the output unit 205 to the mist supply unit 103 (step S24), and the process ends. (FIG. 10).
In addition, about the initial state of the apparatus etc. in the above case (in the case of FIG. 10), the blower 101 is driven, and the mist supply unit 103 may be in any state.

  When a “start” (ON) signal is input to the mist supply unit 103, supply of mist from the mist supply unit 103 to the nozzle 104 is started. In addition, when a “start” (OFF) signal is input to the mist supply unit 103 while the mist supply unit 103 is supplying mist, the mist supply unit 103 maintains the state of supplying mist. To do.

  The above process controls “stop” or “start / stop” for the mist supply means 102 using only one relational expression (step S22), but there are two relational expressions (step S22 in FIG. 11, It is also possible to further perform the control of “mist supply with a small supply amount” using step S25).

Details will be described with reference to FIG. Step S25 is provided between step S22 and step S24. In step S25, when T2-T3 ≦ dew point auxiliary monitoring temperature T23 ″ is satisfied, the output unit 205 sends a signal to the mist supply means 103 that “a mist is supplied in an amount half the normal supply amount”. If the condition is not satisfied, a “start” (ON) signal is output (step S24).
Thereby, the metal coil 112 can be more preferably cooled while preventing condensation on the metal coil 112 after hot rolling.
In addition, about the initial condition of the apparatus etc. in the above case (in the case of FIG. 11), the blower 101 is driven, and the mist supply unit 103 may be in any state.

  When a signal to the effect that “one half of the normal supply amount is supplied” is input to the mist supply unit 103, the supply amount of the mist from the mist supply unit 103 is 1 / of the normal supply amount. 2 quantity. When the signal is input to the mist supply unit 103 in a state where the mist supply unit 103 is supplying a mist that is ½ of the normal supply amount, the mist supply unit 103 has a normal supply amount. The state where the mist supply of 1/2 amount is performed is maintained.

The dew point auxiliary monitoring temperature T23 ″ in step S25 is preferably 5 ° C. to 7 ° C., particularly 6 ° C.
Further, the mist supply amount in step S26 is not limited to a half of the normal supply amount, and may be an amount of 1/4, 3/4, or the like.

In the case where the temperatures of the plurality of metal coils 112 are measured, and one air volume adjusting means 401 is provided near the outside air discharge port 116 of the duct 105, the mist supply means 102 is controlled. Alternatively, the air volume adjusting means 401 may be controlled.
Specifically, whether or not the condition of step S22 (and step S25) is satisfied is determined with respect to the metal temperature T2 output from each metal temperature measuring unit 110, and the corresponding air volume adjusting unit 401 is “stopped”. ("Start / Stop", "Start / Stop / Mist injection of 1/2 the normal injection amount") are output.

  When the “stop” signal is input, the air volume adjusting unit 401 rotates the partition plate to be perpendicular to the air blowing direction. When the “start” signal is input, the air volume adjusting unit 401 rotates the partition plate in the air blowing direction. When a signal indicating “perform mist injection of half the normal injection amount” is input, the partition plate is set at a predetermined angle with respect to the blowing direction. To turn.

  In the first procedure, the mist supply means 103 is controlled using the relationship between the outside air temperature T1, the outside air humidity H1 and the humidity in the duct H2 and the judgment reference value. In the second procedure, the metal temperature T2 and the indoor dew point temperature T3 are controlled. The mist supply means 103 is controlled using the relationship with the above, but the combination is not limited to these.

  For example, if any of the relationship of metal temperature T2−indoor dew point temperature T3 ≦ T23 ′ and outside air temperature T1 ≦ T1 ′ is satisfied, a “stop” (OFF) signal is transmitted from the output unit 205 to the mist supply unit 103. If none of the above applies, the condition of the first procedure and the condition of the second procedure may be combined so that the output unit 205 outputs a “start” (ON) signal to the mist supply unit 103.

  In addition, when only one of the temperature measuring means and the humidity measuring means can be prepared, the above process is performed using only one reference of the first procedure (for example, the reference of the outside air humidity H2 ≧ H2 ′). May be.

  In addition, this invention is not limited only to the said embodiment, As long as it is based on the technical idea of this invention, it can change suitably.

The metal cooling device and the metal cooling method according to the present invention will be described by comparing the case where the requirements of the present invention are satisfied with the case where the requirements of the present invention are not satisfied.
[performance test]
About the metal cooling device and the metal cooling method which concern on this invention, in order to confirm "cooling performance" with respect to a metal coil and "the presence or absence of dew condensation" when a metal coil was cooled, the following tests were done.

[Metal cooling device]
First, the metal cooling device used in the performance test will be described.
The metal cooling device used was composed of a blower, an outside air introduction chamber, a mist supply means, 24 nozzles, a duct, a filter, a measuring means, and a control device.

  As the duct of the metal cooling device, one having 22 outside air discharge ports (size: 400 mm length, 700 mm width) was used. And the ventilation volume and the wind speed of the air blower were adjusted so that the external air of the wind speed of about 15 m / s was discharged from each said external air discharge port.

As the mist supply means of the metal cooling device, one constituted by an air introduction device, a water introduction device, and a mist supply hose was used. The air introducing device introduced 0.4 MPa of air at 4872 NL / min. Moreover, the water introduction apparatus introduces 0.38 MPa water at 42 L / min.
Two filters of the metal cooling device were used and installed so as to cover the opening of the outside air introduction chamber (a filter having a large hole diameter on the windward side and a filter having a small hole diameter on the leeward side).

  For the control device of the metal cooling device, a “stop” signal is input to the mist supply means when the predetermined condition (steps S12 and S22) is satisfied, and a “start” signal is input to the mist supply means when the predetermined condition is not satisfied. (See FIGS. 6 and 10).

[Measuring means]
Regarding the outside air temperature measuring means and the outside air humidity measuring means, a glass thermometer and an electric hygrometer were used and installed on the wind of the outside air introduction chamber. As a means for measuring the humidity in the duct, an electric hygrometer was used and installed in the duct. About the metal temperature measurement means, the thermocouple was used and it installed so that a metal coil (aluminum coil) might be contacted on the mounting base. As the indoor dew point temperature measuring means, an automatic balanced dew point meter was used and installed in the indoor duct.

[Metal coil to be cooled]
As the metal coil to be cooled, pure aluminum A1050 defined in JIS H 4000 after hot rolling was used. The aluminum coil had a cylindrical shape, and the aluminum coil had a diameter of 2 m and a width of 2 m. Twenty-two aluminum coils were installed at a position (on the mounting table) 1 m away from each outside air outlet of the duct.

[Test method for performance test]
The hot-rolled aluminum coil was cooled by natural heat dissipation until it reached 250 ° C., and then cooled by the following method.
The performance test was conducted under the conditions that the ambient temperature around the aluminum coil was 40 ° C. to 50 ° C., the outdoor temperature was 18 ° C. to 27 ° C., and the outdoor humidity was 50% to 90%.

[Cooling method 1]
While driving the blower, the aluminum coil was cooled by the method of driving the mist supply means under the control of the first procedure. The outside air temperature judgment reference value T1 ′ was set to 25 ° C., the outside air humidity judgment reference value H1 ′ was set to 85%, and the duct internal humidity judgment reference value H2 ′ was set to 60%.

[Cooling method 2]
While driving the blower, the aluminum coil was cooled by a method of driving the mist supply means under the control of the second procedure. The dew point monitoring temperature T23 ′ was set to 3 ° C.

[Cooling method 3]
While driving the blower, the aluminum coil was cooled by the method of driving the mist supply means under the control of the first procedure. The outside air temperature judgment reference value T1 ′ was set to 30 ° C., the outside air humidity judgment reference value H1 ′ was set to 80%, and the duct internal humidity judgment reference value H2 ′ was set to 55%.

[Cooling method 4]
While driving the blower, the aluminum coil was cooled by a method of driving the mist supply means under the control of the second procedure. The dew point monitoring temperature T23 ′ was set to 5 ° C.
[Cooling method 5]
The aluminum coil was cooled by driving the blower and driving the mist supply means. Note that the mist supply means is not controlled.

[Cooling method 6]
Although the blower was driven, the mist was not supplied from the mist supply means, and the aluminum coil was cooled.
[Cooling method 7]
The air blower was not driven, the mist supply from the mist supply means was not performed, and the aluminum coil was cooled (natural heat dissipation).

  Table 1 below shows the results of the performance test. In addition, about cooling time, it is time until an aluminum coil becomes 250 degreeC from 60 degreeC, and the cooling time of Table 1 is an average value of the cooling time of 22 aluminum coils. The presence or absence of condensation on the aluminum coil surface was determined by visual confirmation.

  From the above results, according to the method of cooling while spraying mist (cooling methods 1 to 5, especially cooling methods 1, 2, and 5), the method of cooling only by the blower (cooling method 6), and cooling by natural heat dissipation It was found that the cooling time can be greatly shortened compared to the method (cooling method 7).

  Further, in the method of cooling without controlling the mist supply means (cooling method 5), dew condensation has occurred on the surface of the aluminum coil, but by the method of cooling while controlling the mist supply means (cooling methods 1 to 4) It was found that no condensation occurred on the surface of the aluminum coil.

DESCRIPTION OF SYMBOLS 101 Blower 102 Outside air introduction chamber 103 Mist supply means 104 Nozzle 105 Duct 106 Filter 107 Outside air temperature measuring means 108 Outside air humidity measuring means 109 Duct humidity measuring means 110 Metal temperature measuring means 111 Indoor dew point temperature measuring means 112 Metal coil (hot rolling Immediately after coil, stay coil)
113 Dummy coil 114 First mounting table 115 Second mounting table 116 Outside air outlet 117 Roll roll 201 Control device 202 Input unit 203 Processing unit 204 Storage unit 205 Output unit 301 Mist supply hose 302 Wind pressure measuring unit 401 Air volume adjusting unit 402 Wind direction adjusting means

Claims (9)

A metal cooling device for cooling a rolled metal coil placed in a room,
A blower for sending outside air into the room from the outside;
An outside air introduction chamber that is installed to communicate with the blower and the outside, and that guides outside air to the blower;
A duct that is installed to communicate with the blower and the room, and that guides outside air sent by the blower into the room;
At least one filter installed in the outside air introduction chamber so as to cover an opening through which outside air is introduced;
Mist supply means for supplying mist to a nozzle installed in the outside air introduction chamber and outside the filter;
An outside air temperature measuring means for measuring the temperature of outside air outside the room (outside air temperature T1);
An outside air humidity measuring means for measuring the humidity of outside air outside the room (outside air humidity H1);
A duct humidity measuring means for measuring the humidity in the duct (humidity H2 in the duct);
A control device for controlling the driving of the mist supply means,
The control device includes:
When the outside air temperature T1 is smaller than the outside air temperature judgment reference value T1 ′ (T1 ≦ T1 ′), when the outside air humidity H1 is larger than the outside air humidity judgment reference value H1 ′ (H1 ≧ H1 ′), and inside the duct When the humidity H2 is larger than the duct humidity determination reference value H2 ′ (H2 ≧ H2 ′), the mist supply by the mist supply means is stopped when any of the conditions is satisfied. apparatus.   2. The outside air temperature determination reference value T1 ′ is 25 ° C., the outside air humidity determination reference value H1 ′ is 85%, and the duct humidity determination reference value H2 ′ is 60%. Metal cooling device. A metal cooling device for cooling a rolled metal coil placed in a room,
A blower for sending outside air into the room from the outside;
An outside air introduction chamber that is installed to communicate with the blower and the outside, and that guides outside air to the blower;
A duct that is installed to communicate with the blower and the room, and that guides outside air sent by the blower into the room;
At least one filter installed in the outside air introduction chamber so as to cover an opening through which outside air is introduced;
Mist supply means for supplying mist to a nozzle installed in the outside air introduction chamber and outside the filter;
Metal temperature measuring means for measuring the temperature of the metal coil placed in the room (metal temperature T2);
Indoor dew point temperature measuring means for measuring the indoor dew point temperature (indoor dew point temperature T3);
A control device for controlling the driving of the mist supply means,
The control device includes:
When the metal temperature T2 and the indoor dew point temperature T3 satisfy the condition of T2-T3 ≦ dew point monitoring temperature T23 ′, the mist supply unit stops the mist supply.   4. The metal cooling device according to claim 3, wherein the dew point monitoring temperature T23 ′ is 3 ° C. The metal coils are installed in a row (first installation position) on the first mounting table provided on the floor surface in the room so that the coil axis directions of the metal coils are substantially parallel to each other. The second mounting table further provided above the mounting table is installed in a row (second installation position) so that the coil axis direction of the metal coil is substantially parallel,
The outside air discharge port of the duct is provided so that a substantially center of the outside air discharge port is positioned on each coil axis of the metal coil aligned with the first installation position and the second installation position, and the metal The metal cooling device according to any one of claims 1 to 4, wherein the metal cooling device is provided so as to blow outside air in a substantially coil axial direction of the coil.   The metal cooling device according to claim 5, wherein the air duct of the duct has one or more air volume adjusting means for opening and closing the air duct with a partition plate.   The metal cooling device according to claim 5 or 6, wherein the outside air discharge port has a wind direction adjusting means capable of adjusting a wind direction of outside air. A metal cooling method for cooling a rolled metal coil placed in a room,
The outside air supplied with the mist by the mist supply means is blown to the metal coil through a duct communicating with the blower and the room using a blower, and the outdoor outdoor air temperature (outside air temperature T1) and outdoor outdoor air humidity ( Outside air humidity H1), and measuring the humidity in the duct (humidity H2 in the duct),
When the outside air temperature T1 is smaller than the outside air temperature judgment reference value T1 ′ (T1 ≦ T1 ′), when the outside air humidity H1 is larger than the outside air humidity judgment reference value H1 ′ (H1 ≧ H1 ′), and inside the duct When the humidity H2 is larger than the duct humidity determination reference value H2 ′ (H2 ≧ H2 ′), the mist supply by the mist supply means is stopped when any of the conditions is satisfied. Method. A metal cooling method for cooling a rolled metal coil placed in a room,
The outside air supplied with the mist by the mist supply means is blown to the metal coil through a duct communicating with the blower and the room using a blower, and the temperature of the metal coil placed in the room (metal temperature T2). And measuring the indoor dew point temperature (indoor dew point temperature T3),
When the metal temperature T2 and the indoor dew point temperature T3 satisfy a condition of T2-T3 ≦ dew point monitoring temperature T23 ′, the mist supply by the mist supply means is stopped.

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