Dewaxing System

Abstract

To provide dewaxing system which suppresses quality defects of a to-be-heated object.SOLUTION: A dewaxing system 1 comprises: an accommodation unit 11; a combustion burner 31 that allows fuel gas and air to burn into heating of an interior of the accommodation unit 11; and a control device 90 that controls the combustion burner 31. The control device 90 carries out control such that, when there is a to-be-heated object W within the accommodation unit 11, an air-fuel ratio of fuel gas and air to be burned becomes smaller than 1.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention provides Dewaxing System Regarding. [Background technology]

[0002] Traditionally, sintering furnaces have been used in powder metallurgy. In powder metallurgy, powders containing metals and other materials are compressed and formed into a compact (a heated object). The lubricant added during forming is removed using a combustion burner in the sintering furnace's dewaxing system, and then the compact is sintered to bond the powder together.

[0003] In Patent Document 1, the air-fuel ratio when combustible gas (fuel gas) and air are combusted to heat the inside of a sintering furnace is adjusted to about 1.05 to 1.3 times. By controlling in this way, an efficient and safe combustion state can be maintained. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-28415 Summary of the Invention [Problem to be solved by the invention]

[0005] However, there is room for improvement in applying the air-fuel ratio in Patent Document 1 to the dewaxing system of a sintering furnace.

[0006] The present invention has been made in consideration of such problems, and aims to provide a dewaxing system that suppresses quality defects in heated materials, and a control device that controls the combustion burner of the dewaxing system so as to suppress quality defects in heated materials. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention proposes the following means. (1) Aspect 1 of the present invention is a dewaxing system comprising a storage section, a combustion burner that heats the storage section by burning fuel gas and air, and a control device that controls the combustion burner, wherein the control device controls the air-fuel ratio of the combusted fuel gas and the air to be less than 1 when there is an object to be heated in the storage section. (2) Aspect 2 of the present invention is a control device for controlling the combustion burner in a dewaxing apparatus having a storage section and a combustion burner that heats the storage section by burning fuel gas and air, and controls the combustion burner so that the air-fuel ratio of the combusted fuel gas and air is less than 1 when there is an object to be heated in the storage section.

[0008] In these inventions, the inventors have conducted extensive research and found that by controlling the air-fuel ratio to be less than 1 when there is an object to be heated inside the storage section, it is possible to prevent the oxygen gas concentration inside the storage section from becoming too high and to prevent the object to be heated from being decarbonized (carbon being removed from the object to be heated). Therefore, by the control device controlling the air-fuel ratio to be less than 1, it is possible to suppress poor quality of the heated object.

[0009] (3) Aspect 3 of the present invention may be a dewaxing system as described in (1), comprising a temperature sensor for detecting the temperature inside the storage section, a fuel adjustment section for adjusting the supply rate of the fuel gas into the storage section, and an air adjustment section for adjusting the supply rate of the air into the storage section, and the control device may start adjusting the supply rate of the fuel gas using the fuel adjustment section after starting to adjust the supply rate of the air using the air adjustment section based on the detection result of the temperature sensor so that the air-fuel ratio is less than 1. In this invention, combustion at a constant air-fuel ratio allows efficient dewaxing, suppresses quality defects in the heated material, and ensures stable quality. Furthermore, for example, when increasing the temperature inside the storage section, by first increasing the air supply rate, it is possible to prevent the fuel gas from initially becoming too much inside the storage section, and safely increase the temperature inside the storage section.

[0010] (4) Aspect 4 of the present invention may be a dewaxing system described in (1) or (2), in which the combustion burner comprises a support part attached to the storage part, forming a support surface for supporting the object to be heated, and at least a portion of which is arranged within the storage part; an exhaust hole formed in the storage part and arranged on the same side of the support surface as the combustion burner; and a plurality of partition plates arranged in a row along a reference direction along the support surface between the combustion burner and the support surface, in which the exhaust hole is arranged on a first side of the combustion burner in the reference direction, and the plurality of partition plates are each gradually inclined toward the first side as they approach the support surface.

[0011] In this invention, combustion gas generated by combustion in the combustion burner flows between the partition plates and gradually toward the first side as it approaches the support surface of the support part. This combustion gas hits the object to be heated supported on the support surface of the support part, heating the object, and gradually flows toward the first side as it moves away from the support surface. This combustion gas then approaches the exhaust hole and is discharged from the exhaust hole to the outside of the accommodation part. Therefore, the flow of the combustion gas caused by the plurality of partition plates allows the combustion gas to be efficiently discharged from the exhaust hole to the outside of the storage section.

[0012] (5) A fifth aspect of the present invention may be a dewaxing system described in any one of (1) to (3), wherein the control device controls the air-fuel ratio to be 1 or greater when there is no object to be heated in the storage section. In the present invention, by controlling in this manner, the fuel gas consumption can be suppressed by operating in a state where the ratio of fuel gas to air is reduced.

[0013] (6) Aspect 6 of the present invention may be a dewaxing system described in any one of (1) to (4), in which the storage section has a storage section main body and a detachable section that is positioned above the storage section main body and is detachable from the storage section main body, and the combustion burner is attached to the detachable section. In this invention, maintenance inside the storage body can be easily performed by detaching the detachable part to which the combustion burner is attached from the storage body. [Effects of the Invention]

[0014] The dewaxing system and control device of the present invention can suppress quality defects in the heated object. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a partially cutaway overall view of a dewaxing system according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, one embodiment of a dewaxing system and a control device according to the present invention will be described with reference to FIG. 1, the dewaxing system 1 of this embodiment constitutes a part of a sintering furnace. The dewaxing system 1 includes a dewaxing device 10 and a control device 90. The dewaxing apparatus 10 has a storage section 11, a plurality of combustion burners 31, a support section 36, a detection section 41, a plurality of partition plates 46, an in-furnace temperature sensor (temperature sensor) 51, a fuel adjustment section 56, and an air adjustment section 76. The number of combustion burners 31 provided in the dewaxing apparatus 10 is not limited to this, and may be one.

[0017] There is no limitation on the shape of the storage section 11. For example, the storage section 11 has a storage section main body 12 and a detachable section 22. For example, the housing body 12 has a bottom wall 13, first side walls 14 and 15, two second side walls (not shown), and a top wall 16. The bottom wall 13 is formed in a flat plate shape with the thickness direction of the bottom wall 13 aligned along the up-down direction. For example, the bottom wall 13 has a rectangular shape in a plan view.

[0018] The first side walls 14, 15 extend upward from both ends of the bottom wall 13 along a reference direction X, which is one direction along a horizontal plane. Here, the direction along the horizontal plane and perpendicular to the reference direction X is referred to as the orthogonal direction Y. Specifically, the first side wall 14 extends upward from an end of the bottom wall 13 on a first side X1 (hereinafter simply referred to as the first side X1) in the reference direction X. The first side wall 14 has a through-hole 14a formed therein, which penetrates the first side wall 14 in the reference direction X. The first side wall 15 extends upward from an end of the bottom wall 13 on a second side X2 (hereinafter simply referred to as the second side X2) opposite the first side X1 in the reference direction X. The first side wall 14 and the first side wall 15 face each other in the reference direction X. A through hole 15a is formed in the first side wall 15, penetrating the first side wall 15 in the reference direction X. The through hole 15a is formed at the same height as the through hole 14a.

[0019] The two second side walls are connected to the ends of the first side walls 14, 15 in the orthogonal direction Y. For example, the first side walls 14, 15 and the two second side walls are formed in an annular shape that forms the outer periphery of a rectangle in a plan view. The top wall 16 covers the openings formed in the upper portions of the first side walls 14, 15 and the two second side walls. A first portion 16a of the top wall 16 on the first side X1 is disposed lower than a second portion 16b of the top wall 16 on the second side X2. An exhaust hole 16c is formed in the first portion 16a (accommodating portion 11). The exhaust hole 16c passes through the first portion 16a in the vertical direction. An opening 16d is formed in the second portion 16b. The opening 16d passes through the second portion 16b in the vertical direction. When viewed in the vertical direction, it is preferable that the area of ​​the opening 16d is larger than the area of ​​the exhaust hole 16c.

[0020] The bottom wall 13, first side walls 14 and 15, two second side walls, and top wall 16 of the container body 12 are made of known fire-resistant materials. An inlet exhaust stack 18 is connected to the periphery of the exhaust hole 16c in the first portion 16a and extends upward from the periphery. An exhaust duct 19 is provided above the inlet exhaust stack 18 .

[0021] The detachable portion 22 has a top wall 23 and a peripheral wall 24 . The top wall 23 is formed in a flat plate shape with the thickness direction of the top wall 23 aligned with the vertical direction. The top wall 23 is formed to correspond to the shape of the peripheral edge of the opening 16d in the second portion 16b. The top wall 23 is formed with a plurality of through holes 23a corresponding to the plurality of combustion burners 31. The plurality of through holes 23a penetrate the top wall 23 in the vertical direction. The plurality of through holes 23a are arranged at intervals from one another in the reference direction X. The peripheral wall 24 protrudes downward from the outer peripheral edge of the top wall 23. The peripheral wall 24 contacts the peripheral edge of the opening 16d in the second portion 16b from above this peripheral edge. The top wall 23 and the peripheral wall 24 of the detachable portion 22 are made of the same material as the storage portion main body 12 . The detachable portion 22 is disposed above the second portion 16b of the housing body 12 and is detachable from the second portion 16b of the housing body 12.

[0022] Each combustion burner 31 preferably has a known ignition device. The plurality of combustion burners 31 are attached to the top wall 23 of the detachable portion 22 of the storage portion 11. More specifically, the plurality of combustion burners 31 are attached to the periphery of the through-hole 23a in the top wall 23. The plurality of combustion burners 31 are arranged at intervals from one another in the reference direction X. The plurality of combustion burners 31 heat the interior of the storage portion 11 by combusting a mixed gas obtained by mixing fuel gas and air. In this embodiment, for example, butane gas, propane gas, natural gas, or the like is used as the fuel gas.

[0023] For example, the support section 36 is a belt conveyor. The support section 36 extends along the reference direction X and passes through the through holes 14a, 15a of the storage section 11. A portion of the support section 36 is disposed within the storage section 11. The remaining portions of the support section 36 extend from the storage section 11 to the first side X1 and the second side X2, respectively. The upper surface of the support section 36 is a support surface 37 that supports the molded object (object to be heated) W. The support surface 37 is aligned with the reference direction X. For example, the support section 36 transports the molded object W on the support surface 37 toward the first side X1. The support unit 36 ​​may simply support the molded object W to be sintered from below the molded object W without transporting the molded object W. In this case, the entire support unit 36 ​​may be disposed inside the accommodation unit 11. The exhaust hole 16c is disposed closer to the first side X1 in the reference direction X than the plurality of combustion burners 31.

[0024] The exhaust hole 16c is arranged on the same side (above) as the plurality of combustion burners 31 with respect to the support surface 37. For example, the detection unit 41 is an optical sensor that captures an image on the support surface 37 and detects the molded article W. The detection unit 41 is arranged on the first side X1 of the storage unit 11 and detects whether or not the molded article W is present on the support surface 37 on the first side X1 of the storage unit 11. The detection unit 41 transmits the detection result to the control device 90. The detector is not limited to an optical sensor, and the location of the detector is not limited to this, as long as it can detect the presence or absence of the molded article W on the support surface 37 (inside the storage section 11).

[0025] For example, each partition plate 46 is formed in a flat plate shape. The partition plates 46 are arranged at intervals along the reference direction X between the combustion burners 31 and the support surface 37 of the support part 36. The partition plates 46 are each gradually inclined toward the first side X1 as they approach the support surface 37 (as they move downward). For example, each partition plate 46 is formed of a steel plate etc. For example, the plurality of partition plates 46 are fixed to the two second side walls of the storage section 11.

[0026] For example, the furnace temperature sensor 51 is attached to the lower part of the plurality of partition plates 46. The furnace temperature sensor 51 detects the temperature inside the accommodation section 11 and transmits the detection result to the control device 90. The location of the furnace temperature sensor 51 is not limited to this.

[0027] The fuel adjusting unit 56 adjusts the supply rate of the fuel gas into the container 11. The supply rate of the fuel gas here means the amount of fuel gas supplied per unit time, such as one second. The fuel adjusting unit 56 includes a fuel supply source 57 , a fuel supply pipe 58 , a bypass pipe 59 , a plurality of fuel branch pipes 60 , a fuel flow sensor 61 , and a control valve 62 .

[0028] The fuel supply source 57 is a fuel cylinder, etc. The fuel supply source 57 supplies fuel gas. A first end of the fuel supply pipe 58 is connected to a fuel supply source 57 . The bypass pipe 59 is connected to pipe connection portions 58a and 58b, which are different portions in the longitudinal direction of the fuel supply pipe 58. The pipe connection portion 58a is located closer to the first end of the fuel supply pipe 58 than the pipe connection portion 58b. The bypass pipe 59 is preferably provided with an on-off valve 66 such as a ball valve. First ends of the plurality of fuel branch pipes 60 are respectively connected to second ends of the fuel supply pipe 58, the second ends being opposite to the first ends. The second ends of the plurality of fuel branch pipes 60, the second ends being opposite to the first ends, are respectively connected to the plurality of combustion burners 31. Each fuel branch pipe 60 is preferably provided with a needle valve 67 .

[0029] The fuel flow rate sensor 61 is provided between the first end of the fuel supply pipe 58 and the pipe connection portion 58a. A differential pressure sensor is preferably used as the fuel flow rate sensor 61. The fuel flow rate sensor 61 transmits the detection result of the flow rate of the fuel gas to the control device 90. The control valve 62 includes a flow rate adjustment valve 62a and a drive motor 62b. For example, a butterfly valve is used as the flow rate adjustment valve 62a. The flow rate adjustment valve 62a is provided in the fuel supply pipe 58 between the pipe connection portion 58a and the pipe connection portion 58b.

[0030] It is preferable that a pressure gauge 68 and a plurality of solenoid valves 69 are provided in this order from the first end side between the first end of the fuel supply pipe 58 and the portion where the fuel flow sensor 61 is provided. An operating valve 70 is provided between the portion of the fuel supply pipe 58 where the fuel flow sensor 61 is provided and the pipe connection portion 58a. The operating valve 70 is used to equalize the pressure of the fuel gas and the pressure of the air to maintain a constant mixture ratio. An on-off valve 71 is preferably provided between the pipe connection portion 58a of the fuel supply pipe 58 and the portion where the flow rate adjustment valve 62a is provided. An on-off valve 72 is preferably provided in the fuel supply pipe 58 between the portion where the flow rate adjustment valve 62a is provided and the pipe connection portion 58b.

[0031] The air adjusting unit 76 adjusts the speed at which air is supplied into the storage unit 11. The air supply speed here means the amount of air supplied per unit time, such as one second. The air adjusting unit 76 has an air supply source 77 , an air supply pipe 78 , a plurality of air branch pipes 79 , an air flow sensor 80 , and a control valve 81 .

[0032] For example, a blower can be used as the air supply source 77. The air supply source 77 supplies air. A first end of the air supply pipe 78 is connected to an air supply source 77 . First ends of the plurality of air branch pipes 79 are respectively connected to a second end opposite to the first end of the air supply pipe 78. The second ends of the plurality of air branch pipes 79 opposite to the first end are respectively connected to the plurality of combustion burners 31. Each air branch pipe 79 is preferably provided with a needle valve 84 .

[0033] The air flow sensor 80 is provided at a portion on the first end side of the air supply pipe 78. A differential pressure sensor is preferably used as the air flow sensor 80. The air flow sensor 80 transmits the detection result of the air flow rate to the control device 90. The control valve 81 includes a flow rate adjustment valve 81a and a drive motor 81b. For example, a butterfly valve is used as the flow rate adjustment valve 81a. The flow rate adjustment valve 81a is provided between the portion of the air supply pipe 78 where the air flow rate sensor 80 is provided and the second end. The drive motor 81b adjusts the opening of the flow rate adjustment valve 81a in multiple stages or continuously.

[0034] The air supply pipe 78 is preferably provided with a pressure gauge 85 and an air temperature sensor 86 . The pressure gauge 85 is provided between the first end of the air supply pipe 78 and the portion where the air flow sensor 80 is provided. The air temperature sensor 86 is provided in the air supply pipe 78 between the portion where the air flow sensor 80 is provided and the portion where the flow rate adjustment valve 81a is provided.

[0035] Here, the air-fuel ratio R of the fuel gas and air (mixed gas) burned by the combustion burner 31 is defined by the formula (1). R = "Air flow rate" / ("Fuel gas flow rate" × "Theoretical air volume") (1) However, the units of air flow rate and fuel gas flow rate are "m 3 / h (cubic meters per hour). The theoretical air volume is measured in m 3 / m 3 The theoretical air volume is calculated by dividing the volume by the unit volume (e.g., 1 m 3 ) means the volume of air required to completely combust fuel gas.

[0036] Although not shown, the control device 90 has a CPU (Central Processing Unit), memory, etc. The control device 90 is connected to the support part 36, the ignition devices of the plurality of combustion burners 31, the detection part 41, the furnace temperature sensor 51, the fuel flow sensor 61, the drive motor 62b of the control valve 62, the air flow sensor 80, and the drive motor 81b of the control valve 81. The control device 90 controls the ignition devices of the plurality of combustion burners 31, the support portion 36, and the drive motors 62b and 81b of the control valves 62 and 81.

[0037] Next, the operation of the dewaxing system 1 configured as above will be described. The control device 90 previously controls the drive motors 62b, 81b of the control valves 62, 81 to set the flow rate adjustment valves 62a, 81a to appropriate openings, and also controls the plurality of ignition devices to combust the mixed gas, thereby heating the inside of the accommodation unit 11 to a predetermined temperature. At this time, the supply sources 57, 77 are driven and the flow rate adjustment valves 62a, 81a are set to predetermined openings, thereby adjusting the air-fuel ratio R to a constant air-fuel ratio R0 that is less than 1. For example, the air-fuel ratio R0 is a value of 0.7, 0.8, 0.9, etc. The air-fuel ratio R0 varies depending on the configuration of the accommodation section and the object to be heated, but is a value less than 1.

[0038] The control device 90 drives the support unit 36 ​​to move the support surface 37 toward the first side X1. A supply device (not shown) places multiple molded articles W on the support surface 37 of the support unit 36 ​​on the second side X2 from the storage unit 11. When the multiple molded articles W are transported into the storage unit 11, the detection unit 41 detects the molded articles W and transmits a detection result to the control device 90 that "molded articles W are present on the support surface 37 (molded articles W are present in the storage unit 11)." The control device 90 controls the air-fuel ratio R to be less than 1. More specifically, based on the detection result of the furnace temperature sensor 51, the control device 90 starts adjusting the air supply rate by the air adjustment unit 76 so that the air-fuel ratio R is less than 1, and then starts adjusting the fuel gas supply rate by the fuel adjustment unit 56.

[0039] More specifically, for example, when the temperature detected by the furnace temperature sensor 51 is lower than the predetermined temperature, the control device 90 first increases the aperture of the flow rate control valve 81a (opens the flow rate control valve 81a further) using the drive motor 81b of the air adjustment unit 76, thereby increasing the air supply rate. In conjunction with the increase in the air supply rate, the drive motor 62b of the fuel adjustment unit 56 increases the aperture of the flow rate control valve 62a, thereby increasing the fuel gas supply rate so that the air-fuel ratio R becomes the air-fuel ratio R0. As a result, the supply speed of the mixed gas to be burned increases while the air-fuel ratio R is maintained at the air-fuel ratio R0, and the temperature detected by the furnace temperature sensor 51 increases. In this way, the adjustment of the air supply rate by the air adjustment unit 76 and the adjustment of the fuel gas supply rate by the fuel adjustment unit 56 may or may not be performed simultaneously.

[0040] On the other hand, for example, when the temperature detected by the furnace temperature sensor 51 is higher than a predetermined temperature, the control device 90 first reduces the opening of the flow rate control valve 81a using the drive motor 81b of the air adjustment unit 76 (closes the flow rate control valve 81a further), thereby reducing the air supply rate. Then, the control device 90 reduces the opening of the flow rate control valve 62a using the drive motor 62b of the fuel adjustment unit 56, thereby reducing the fuel gas supply rate so that the air-fuel ratio R becomes the air-fuel ratio R0. As a result, the supply speed of the mixed gas to be burned decreases while the air-fuel ratio R is maintained at the air-fuel ratio R0, and the temperature detected by the furnace temperature sensor 51 decreases.

[0041] When the detection unit 41 detects that there is no molded object W on the support surface 37 (there is no molded object W in the storage unit 11), the control device 90 may perform control so that the air-fuel ratio becomes 1 or more. The minimum value of the air-fuel ratio R is preferably about 0.6. The control device 90 may record in memory the change in the air-fuel ratio R over time, thereby stabilizing the quality of the dewaxed molded article W.

[0042] As described above, the inventors have conducted extensive research into the dewaxing system 1 and control device 90 of this embodiment and have discovered that by controlling the air-fuel ratio R to be less than 1 when there is a molded object W in the storage section 11, the oxygen gas concentration in the storage section 11 can be prevented from increasing and the molded object W can be prevented from being decarburized. Therefore, by the control device 90 controlling the air-fuel ratio R to be less than 1, it is possible to suppress the occurrence of poor quality of the molded product W.

[0043] Based on the detection result of the furnace temperature sensor 51, the control device 90 starts adjusting the air supply rate using the air adjustment unit 76 so that the air-fuel ratio R is less than 1, and then starts adjusting the fuel gas supply rate using the fuel adjustment unit 56. This allows combustion at a constant air-fuel ratio, making it possible to efficiently perform dewaxing, suppress quality defects in the molded product W, and ensure stable quality. Furthermore, for example, when increasing the temperature in the storage unit 11, by first starting to increase the air supply rate, it is possible to prevent the fuel gas from initially becoming too much in the storage unit 11, and safely increase the temperature in the storage unit 11.

[0044] The plurality of partition plates 46 are each inclined so as to gradually move toward the first side X1 as they approach the support surface 37. The combustion gas generated by combustion in the combustion burner 31 flows through the plurality of partition plates 46, gradually toward the first side X1 as it approaches the support surface 37 of the support part 36. This combustion gas hits the molded article W supported on the support surface 37 of the support part 36, heating the molded article W, and gradually flows toward the first side X1 as it moves away from the support surface 37 (moves upward). Then, this combustion gas approaches the exhaust hole 16c, is discharged from the exhaust hole 16c toward the outside of the storage part 11, and is appropriately treated in the inlet exhaust stack 18 and the exhaust duct 19. Therefore, the flow of the combustion gas caused by the plurality of partition plates 46 allows the combustion gas to be efficiently discharged to the outside of the accommodating section 11 through the exhaust holes 16c. For example, when the object to be heated is a molded object W, the lubricant can be efficiently removed from the molded object W.

[0045] When there is no molded object W on the support surface 37, the control device 90 may control the air-fuel ratio to be equal to or greater than 1. In this case, the rate of fuel gas in the mixed gas is reduced during operation, thereby suppressing the consumption of fuel gas. The storage unit 11 has a storage unit main body 12 and a detachable part 22. Therefore, by detaching the detachable part 22, to which multiple combustion burners 31 are attached, from the storage unit main body 12, maintenance inside the storage unit main body 12 can be easily performed.

[0046] Although one embodiment of the present invention has been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and configuration changes, combinations, deletions, etc. are also included within the scope that does not deviate from the gist of the present invention. For example, in the above embodiment, the control device 90 may start adjusting the supply rate of air by the air adjustment unit 76 after starting to adjust the supply rate of fuel gas by the fuel adjustment unit 56 so that the air-fuel ratio R is less than 1, or may start adjusting these supply rates simultaneously.

[0047] The exhaust hole 16c may be arranged on the second side X2 of the plurality of combustion burners 31. In the storage unit 11, the detachable part 22 does not have to be detachable from the storage unit main body 12. When the maximum opening degree of the flow rate adjustment valves 62a, 81a is set to 100%, the control device 90 may adjust the opening degree of the flow rate adjustment valves 62a, 81a in steps of 10% or the like. The dewaxing system 1 does not necessarily have to include at least one of the inlet exhaust stack 18, the exhaust duct 19, the plurality of partition plates 46, the bypass pipe 59, the on-off valve 66, and the operating valve 70. [Explanation of symbols]

[0048] 1 Dewaxing System 11 Storage section 12. Storage unit body 16c Exhaust hole 22 Detachable part 31 Combustion burner 36 Support part 37 Support surface 46 Partition 51 Furnace temperature sensor (temperature sensor) 56 Fuel adjustment section 76 Air conditioning unit 90 Control device W Heated object X reference direction X1 1st side

Claims

1. A storage section; a combustion burner that burns fuel gas and air to heat the inside of the accommodation portion; a control device for controlling the combustion burner; Equipped with a temperature sensor for detecting a temperature inside the storage section; a fuel adjusting unit that adjusts the supply rate of the fuel gas into the storage unit; an air adjusting unit that adjusts the speed at which the air is supplied into the storage unit; Equipped with the control device controls the air-fuel ratio of the fuel gas to the air to be combusted to be less than 1 when an object to be heated is present in the accommodation portion, A dewaxing system in which the control device starts adjusting the supply rate of the fuel gas using the fuel adjustment unit after starting to adjust the supply rate of the air using the air adjustment unit so that the air-fuel ratio is less than 1 based on the detection result of the temperature sensor.

2. A storage section; a combustion burner attached to the accommodation portion and configured to combust fuel gas and air to heat the interior of the accommodation portion; a control device for controlling the combustion burner; a support part having a support surface for supporting an object to be heated and at least a portion of which is disposed within the accommodation part; an exhaust hole formed in the accommodation portion and arranged on the same side as the combustion burner with respect to the support surface; A plurality of partition plates are arranged between the combustion burner and the support surface along a reference direction that is along the support surface and includes a side on which the heated object is transported; Equipped with the control device controls the air-fuel ratio of the fuel gas to the air to be combusted to be less than 1 when an object to be heated is present in the accommodation portion, In the reference direction, the exhaust hole is disposed on a first side relative to the combustion burner, A dewaxing system, wherein each of the plurality of partition plates is gradually inclined toward the first side as it approaches the support surface.

3. A storage section; a combustion burner that burns fuel gas and air to heat the inside of the accommodation portion; a control device for controlling the combustion burner; Equipped with the control device controls the air-fuel ratio of the fuel gas to the air to be combusted to be less than 1 when an object to be heated is present in the accommodation portion, The control device controls the air-fuel ratio to be 1 or greater when the object to be heated is not present in the storage section.

4. A storage section; a combustion burner that burns fuel gas and air to heat the inside of the accommodation portion; a control device for controlling the combustion burner; Equipped with the control device controls the air-fuel ratio of the fuel gas to the air to be combusted to be less than 1 when an object to be heated is present in the accommodation portion, The storage section is A housing body; a detachable portion disposed above the storage body and detachable from the storage body; and A dewaxing system, wherein the combustion burner is attached to the detachable portion.

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