Defatting furnace

Abstract

Provided is a debinding furnace that reduces the load on the flow path of exhaust gas. A debinding furnace (10) that debinds a debinding object (12) includes a furnace body (14) that houses the debinding object (12), a burner (40) that burns gas while exhausting the gas from the furnace body (14), and a condenser (56) that cools and condenses the gas exhausted from the burner (40). The debinding furnace (10) includes a first duct (50) that is connected to an exhaust port (48) of the burner (40), a second duct (52) that is provided with the condenser (56), is annular, and through which the gas passes from the first duct (50), a fan (58) that causes the gas to flow in the second duct (52), and a third duct (54) that exhausts the gas from the second duct (52) to the outside of the second duct (52).

Description

Technical Field

[0001] This invention relates to a degreasing oven. Background Technology

[0002] Previously, degreasing of ceramic-containing materials was performed using a degreasing furnace. For example, Patent Document 1 describes a furnace comprising: a furnace body for holding the degreased material and a heating element for heating the degreased material. The furnace in Patent Document 1 heats the degreased gas to decompose organic matter. Then, water is sprayed into the gas flow path to lower the gas temperature.

[0003] [Existing Technical Documents]

[0004] [Patent Literature]

[0005] Patent Document 1: International Publication No. WO2005 / 047207 (Paragraph 0042) Summary of the Invention

[0006] [The problem the invention aims to solve]

[0007] However, by spraying water onto the treated gas, water may accumulate in the gas flow path. This water can overload the gas and may prevent it from being discharged smoothly.

[0008] Therefore, the object of the present invention is to provide a degreasing furnace that reduces the load of the discharged gas.

[0009] [Technical means to solve the problem]

[0010] To address the above-mentioned issues, the degreasing furnace of the present invention includes the structure described below.

[0011] The degreasing furnace of the present invention is a degreasing furnace for degreasing a substance, the degreasing furnace comprising: a furnace body for containing the substance to be degreased; a burner for burning gas while discharging gas from the furnace body; and a condenser for cooling and condensing the gas discharged from the burner.

[0012] [The effects of the invention]

[0013] According to the present invention, by using a condenser to condense the gas and discharge the liquid generated at this time, the gas exhaust path will not be blocked by the liquid, and the gas load can be reduced compared with the past. Attached Figure Description

[0014] Figure 1 This is a diagram showing the structure of the degreasing furnace of the present invention.

[0015] Figure 2 It is a diagram showing the condenser, pipes, and fan.

[0016] Figure 3 This is a diagram showing the structure of the first pipe entering the second pipe.

[0017] Figure 4 (a) and (b) are diagrams showing the piping of the condenser. (a) shows the first piping, and (b) shows the second piping. Detailed Implementation

[0018] The degreasing furnace of the present invention will be described with reference to the drawings. Although multiple embodiments are described, there are cases where the same symbols are used to denote the same parts even in different embodiments to omit the description.

[0019] [Implementation Method 1]

[0020] Figure 1 The degreasing furnace 10 of this application shown includes a furnace body 14 for housing the degreased material 12, a saturated steam generating device 18 for saturated steam, and a superheater 20 for generating superheated steam.

[0021] [Defatted material]

[0022] The degreased material 12 comprises a ceramic molded body. The ceramics include: nitride-based ceramics (aluminum nitride, silicon nitride, etc.), carbide-based ceramics (silicon carbide, boron carbide, etc.), and oxide-based ceramics (alumina, zirconium, etc.). The degreased material 12 contains a binder. The binder is mixed into the ceramic during the molding of the degreased material 12. By heating the degreased material 12, the binder is released from the degreased material 12 in gaseous form. The binder uses resins such as polybutyl methacrylate, polyvinyl alcohol, methylcellulose, vinyl acetate, and polyethylene glycol, and also uses lubricants, plasticizers, and dispersants.

[0023] [furnace body]

[0024] The furnace body 14 is made of heat-resistant materials such as SUS310S or SUS316L. The furnace body 14 is container-shaped, housing the degreased material 12 within its internal space 22. A door is provided at any location on the furnace body 14, opening and closing as the degreased material 12 enters or exits. A support 24 for arranging the degreased material 12 may also be included within the internal space 22 of the furnace body 14. The furnace body 14 has a supply port 26 and an exhaust port 28. Superheated steam is supplied to the internal space 22 of the furnace body 14 from the supply port 26. Gas from the furnace body 14, containing components generated during the degreasing process of the degreased material 12, is discharged from the exhaust port 28.

[0025] [Saturated Steam Generator]

[0026] The device includes a saturated steam generating apparatus 18 that supplies saturated steam to the superheater 20. The saturated steam generating apparatus 18 includes a boiler that generates saturated steam by boiling a liquid such as pure water.

[0027] [Superheater]

[0028] The superheater 20 is a device for generating superheated steam from saturated steam. Examples of superheaters 20 include convection superheaters, radiant superheaters, suspended superheaters, screen-type superheaters, and horizontal superheaters. The superheater 20 includes a long tube in which saturated steam flows. The saturated steam flowing in the long tube is heated to become superheated steam. The generated superheated steam is supplied to the furnace body 14. This superheated steam is a gas containing colorless and transparent water (H2O) that raises the temperature of saturated steam from 100°C to a higher temperature under normal pressure. The temperature of the superheated steam is 200°C or higher, preferably 500°C or higher, and more preferably 600°C to 1200°C.

[0029] The furnace body 14 is connected to the superheater 20, and the saturated steam generating device 18 is connected to the superheater 20 via piping 30 and piping 32. Since high-temperature superheated steam flows in piping 30, piping 30 is preferably made of heat-resistant material. Valves may also be installed on each of the piping 30 and 32 to control the flow rate of saturated steam and superheated steam by opening and closing the valves.

[0030] [thermometer]

[0031] This application includes a thermometer 36 for measuring the ambient temperature of the internal space 22 of the furnace body 14. The thermometer 36 utilizes a thermocouple thermometer. The location of the furnace body 14 for temperature measurement is determined according to the design, as is the number of thermometers 36. The supply of superheated steam to the furnace body 14 is controlled by the measured temperature. Therefore, this application includes a control device 38 for controlling the superheater 20 and the saturated steam generating device 18.

[0032] [Control Device]

[0033] The system includes a control device 38, which receives the temperature from a thermometer 36 and controls the supply quantity and temperature of superheated steam to the furnace body 14. The control device 38 includes a central processing unit (CPU) or a programmable logic controller (PLC) and other computational circuits. The control device 38 controls the saturated steam generator 18 and the superheater 20, or controls the valves on the piping 30 and piping 32.

[0034] [Burner]

[0035] The degreasing furnace 10 of this application includes a burner 40, which serves as a gas passage for the furnace body 14 and combusts the gas. The burner 40 is connected to the exhaust port 28 of the furnace body 14. The burner 40 includes a passage 44 formed by a heat insulation body 42 and a heating device (not shown). The heating device is an electric heater, a gas burner, or a heavy oil burner, etc. Gas released from the degreased material 12 enters the passage 44 from the furnace body 14 and passes through the passage 44. The heating device heats the gas and decomposes or converts it into gases such as carbon dioxide.

[0036] [pipeline]

[0037] The degreasing furnace 10 of this application includes a pipe 46 through which gas flows from the burner 40 and is used for exhaust. Figure 2 The conduit 46 includes: a first conduit 50 connected to the exhaust port 48 of the burner 40; a second conduit 52 forming an annular shape; and a third conduit 54 for discharging gas. Each of the conduits 50, 52, and 54 is cylindrical, and gas flows through them.

[0038] The first pipe 50 is a passage for gas to flow from the burner 40 to the second pipe 52. The second pipe 52 connects the four cylinders to form a ring, and the gas flows in the direction of arrow w in the second pipe 52. The third pipe 54 is connected to the second pipe 52 and is a passage for exhausting the gas.

[0039] A portion of the first conduit 50 enters the inner side of the second conduit 52 from the third conduit 54. Figure 3 Gas is guided from burner 40 to second pipe 52 via first pipe 50. A gap 64 exists between the outer surface of first pipe 50 and the inner surface of second pipe 52. A portion of first pipe 50 is positioned at the corner portion of second pipe 52, which is square in shape. Gas circulating in second pipe 52 comes into contact with a portion of first pipe 50, and a portion of said gas is entrained in the gas entering second pipe 52 from first pipe 50, thus circulating again in second pipe 52. Gas exiting first pipe 50 mixes with gas circulating in second pipe 52, which can reduce the temperature of all gas circulating in second pipe 52. The gas can be easily condensed using condenser 56, described later.

[0040] The third pipe 54 is connected to the second pipe 52. The connected portion is where the first pipe 50 enters the second pipe 52. The third pipe 54 is installed in the opposite direction to the gas flow in the first pipe 50. A portion of the gas that circulates in the second pipe 52 and comes into contact with the first pipe 50 circulates again in the second pipe 52, while the remainder is guided to the third pipe 54 and discharged. By discharging a portion of the gas, pressure drop in the furnace body 14 and burner 40 is prevented.

[0041] [Condenser]

[0042] This application includes a condenser 56. The condenser 56 is disposed in a second conduit 52 to cool and condense gas flowing in the second conduit 52. The condenser 56 includes a spiral first piping 60 disposed in the second conduit. Figure 4 (a) and the U-shaped second piping 62 installed on the outer surface of the second pipe 52. Figure 4 (b) A pump (not shown) that flows the cooling liquid in these pipes 60 and 62. The cooling liquid flows in the first pipe 60 and the second pipe 62. The first pipe 60 directly cools the gas. The second pipe 62 cools the second pipe 52 and the gas that comes into contact with the inner surface of the second pipe 52. The high-temperature gas after passing through the burner 40 is cooled and condensed by the condenser 56. Moisture contained in the gas appears as dew on the surface of the pipes 60 of the condenser 56 and the inner surface of the second pipe 52. Furthermore, the number and shape of the first pipe 60 and the second pipe 62 are not limited as long as the gas can be condensed.

[0043] [fan]

[0044] The system includes a fan 58 that controls the gas flow in the duct 46. The fan 58 is a sirocco fan. The fan 58 is positioned downstream of the condenser 56 in the gas flow of the second duct 52. Because the gas temperature decreases in the condenser 56, the hot gas does not come into contact with the fan 58, thus protecting the fan 58.

[0045] [Can]

[0046] The degreasing furnace 10 of this application includes a tank 66, which stores the liquid generated when gas is condensed using a condenser 56. A pipe 68 is provided at the lower part of a second pipe 52. The liquid flows from the lower part of the second pipe 52 through the pipe 68 to the tank 66. By discharging the liquid from the second pipe 52, the liquid does not become a load on the gas flowing in the second pipe 52.

[0047] [Degreasing Methods]

[0048] Next, the degreasing method using the degreasing furnace 10 will be described. (1) The degreased material 12 is contained in the internal space 22 of the furnace body 14. For example, the degreased material 12 is a molded product containing nitride-based ceramics.

[0049] (2) The saturated steam generating device 18 heats the liquid to generate saturated steam and supplies the saturated steam to the superheater 20. The superheater 20 generates superheated steam from the saturated steam. The superheated steam is supplied to the furnace body 14. The degreased material 12 is degreased using the superheated steam.

[0050] (3) The gas generated during the degreasing of the degreased material 12 is supplied from the exhaust port 28 to the burner 40 and is burned to become carbon dioxide, etc.

[0051] (4) Gas flows from burner 40 through first pipe 50 to second pipe 52. Driven by fan 58, the gas entering second pipe 52 flows within it and is cooled and condensed by condenser 56 located midway through it. Liquid produced in condenser 56 flows with gravity to the lower part of second pipe 52 and is stored in tank 66 through pipe 68. The liquid stored in tank 66 is then discharged.

[0052] (5) The gas flowing in the second pipe 52 comes into contact with a portion of the first pipe 50 that enters the interior of the second pipe 52. A portion of the gas mixes with the gas entering the second pipe 52 from the first pipe 50 and flows again in the second pipe 52. The remaining gas enters the third pipe 54 from the second pipe 52 and is discharged.

[0053] As described above, in this application, the discharged gas is condensed by the condenser 56, and the resulting liquid is stored in the tank 66. Thus, the liquid is not stored in the exhaust path and does not obstruct the flow of gas. Since exhaust can proceed smoothly, the state of the gas in the internal space 22 of the furnace body 14 can be easily controlled, thereby easily degreasing to the desired state.

[0054] [Implementation Method 2]

[0055] The second conduit 52 may include an opening / closing section 70 for connecting the interior to the exterior. Figure 2 , Figure 3 When the opening / closing part 70 is open, the interior of the second pipe 52 is open relative to the outside. External gas can be applied to the gas flowing in the second pipe 52. The temperature of the gas flowing in the second pipe 52 can be easily reduced and condensed. The opening / closing area of ​​the opening / closing part 70 can be appropriately adjusted. The amount of external gas flowing into the second pipe 52 can be adjusted.

[0056] The opening / closing part 70 is located near the exhaust port 72 of the first pipe 50 in the second pipe 52 and downstream of the exhaust port 72. Figure 3 Gas enters the second pipe 52 from the first pipe 50, and external gas enters the second pipe through the opening and closing part 70 in such a way that it is drawn into the flow of the gas.

[0057] [Implementation Method 3]

[0058] The saturated steam generating device 18 utilizes the liquid generated in the condenser 56 to generate saturated steam. A tank 66 is connected to the saturated steam generating device 18. The liquid generated in the condenser 56 is stored in the tank 66, and the saturated steam generating device 18 utilizes this liquid to generate saturated steam. Alternatively, if the liquid in the tank 66 is insufficient, the saturated steam generating device 18 can replenish the liquid from other devices. Alternatively, the tank 66 can be omitted, and the liquid generated in the condenser 56 can be directly supplied to the saturated steam generating device 18.

[0059] The liquid supplied to the saturated steam generating device 18 is not limited to the liquid described above. Various liquids can be used, such as liquids flowing in tap water pipes or liquids filtered from well water using a filter.

[0060] [Implementation Method 4]

[0061] The condenser 56 also allows liquid stored in tank 66 to flow to pipes 60 and 62. A pump included in the condenser 56 allows liquid stored in tank 66 to flow to pipes 60 and 62. If the liquid in tank 66 is insufficient relative to the liquid flowing to pipes 60 and 62, additional liquid can be added.

[0062] [Implementation Method 5]

[0063] The saturated steam generating device 18 can also utilize the liquid flowing in the pipes 60 and 62 of the condenser 56 to generate saturated steam. When the liquid flows in the pipes 60 and 62 of the condenser 56, the temperature rises, making it easier to generate saturated steam in the saturated steam generating device 18.

[0064] [Implementation Method 6]

[0065] It may also include a thermometer that measures the temperature of the gas in the second conduit 52. The temperature from the thermometer can be input to the control device 38. The control device 38 may also control the speed of the fan 58 or the pump of the condenser 56 to control the flow rate of the liquid flowing in the piping 60 and piping 62. The condensation of the gas can be controlled, thereby preventing the gas from flowing to the third conduit 54 at a high temperature and being cooled and condensed in the third conduit 54.

[0066] A thermometer may also be included in at least one of the first pipe 50 and the third pipe 54 to measure the temperature of the gas. The measured temperature can be input to the control device 38, which can control the pump of the fan 58 and the condenser 56.

[0067] Additionally, a thermometer may be included to measure the temperature of the liquid flowing in pipes 60 and 62. The temperature measured by the thermometer is input to the control device 38. If the liquid temperature exceeds a specified value, the control device 38 may also stop the degreasing furnace 10. This protects pipes 60 and 62.

[0068] [Implementation Method 7]

[0069] The condenser 56 uses liquid cooling, but a fan can also be added to blow air onto the outer surface of the second duct 52.

[0070] [Implementation Method 8]

[0071] The liquid can also be discharged directly from the second pipe 52. If the liquid is not stored in the second pipe 52, then the presence or absence of a tank 66 is not necessary.

[0072] [Implementation Method 9]

[0073] The described embodiment uses a degreasing furnace that utilizes superheated steam, but the degreasing furnace 10 of this application is not limited to a structure that utilizes superheated steam. For example, it could also be a structure in which an inert gas is introduced into the furnace body 14 before superheated steam is introduced, allowing for preheating. Therefore, an inert gas source could also be included, allowing the inert gas to be heated in the superheater 20. After the temperature of the material to be degreased 12 is raised using the inert gas, superheated steam is introduced into the furnace body 14. Regarding degreasing, initially, because the temperature of the material to be degreased 12 is low, condensation may form on the surface of the material to be degreased 12 when superheated steam is initially introduced, potentially causing the material to be degreased 12 to deteriorate. By preheating the material to be degreased 12 by introducing heated inert gas into the furnace body 14 before superheated steam, condensation will not form on the surface of the material to be degreased 12 when superheated steam is introduced, thereby allowing for the desired degreasing.

[0074] [Implementation Method 10]

[0075] The temperature input to the thermometer 36 in the control device 38, the control status of the superheater 20, etc., by the control device 38 can be sent to a designated computer via a network. The degreasing status can be remotely monitored. In addition, the data sent from the control device 38 can also be recorded to a server.

[0076] (First item) A degreasing furnace of one form is a degreasing furnace for degreasing a substance, the degreasing furnace comprising: a furnace body for housing the substance to be degreased; a burner for burning gas while exhausting gas from the furnace body; and a condenser for cooling and condensing the gas exhausted from the burner.

[0077] According to the degreasing furnace described in the first item, the gas is condensed by the condenser, which can prevent the gas from condensing during the exhaust process and becoming a load on the exhaust path.

[0078] (Second item) The degreasing furnace includes: a first pipe connected to the exhaust port of the burner; a second pipe equipped with the condenser, forming an annular shape, and for gas to enter from the first pipe; a fan for causing gas to flow in the second pipe; and a third pipe for discharging gas from the second pipe to the outside of the second pipe.

[0079] According to the degreasing furnace described in the second item, the gas can be condensed while the gas is circulated in the second pipe by a fan.

[0080] (Third item) A portion of the first pipe enters the second pipe.

[0081] According to the degreasing furnace described in the third item, the circulating gas enters the second pipe through the first pipe, allowing the circulating gas to come into contact with the first pipe and enabling a portion of the gas to circulate again. This lowers the temperature of the gas flowing in the second pipe, making it easier to condense.

[0082] (Fourth item) The degreasing oven includes an opening and closing part, which is disposed in the second pipe and is used to draw air from the outside of the second pipe into the second pipe.

[0083] According to the degreasing furnace described in item four, external gas can be introduced into the second pipe from the outside through the opening and closing part, thereby reducing the temperature of the gas and making it easier to condense.

[0084] (Fifth item) The degreasing furnace includes: a saturated steam generating device that uses liquid generated when the gas is condensed by the condenser to generate saturated steam; and a superheater that superheats the saturated steam and generates superheated steam that enters the furnace body.

[0085] According to the degreasing furnace described in item 5, by reusing the liquid generated from condensation to generate superheated steam, the liquid can be circulated, thereby reducing the environmental impact.

[0086] (Sixth item) The condenser includes piping in which liquid generated when the gas is condensed by the condenser flows.

[0087] According to the degreasing furnace described in item six, the environmental impact can be reduced by allowing the liquid generated in the condenser to flow in the piping of the condenser.

[0088] (Seventh item) The degreasing furnace includes a tank that stores the liquid generated when the gas is condensed using the condenser.

[0089] According to the degreasing furnace described in item 7, the liquid generated by condensation can be stored in a tank, and various stored liquids can be utilized.

[0090] In addition, the present invention can be implemented in various modified, altered, and modified forms based on the knowledge of those skilled in the art without departing from its spirit. The described embodiments are not independent and can be appropriately combined and implemented based on the knowledge of those skilled in the art.

[0091] [Industry availability]

[0092] The present invention provides a degreasing furnace that reduces the load of the discharged gas.

[0093] [Explanation of Symbols]

[0094] 10: Degreasing furnace

[0095] 12: Degreased product

[0096] 14: Furnace body

[0097] 18: Saturated Steam Generating Device

[0098] 20: Superheater

[0099] 22: The internal space of the furnace body

[0100] 24: Bracket

[0101] 26: Supply Port

[0102] 28: Exhaust port

[0103] 30, 32: Piping

[0104] 36: Thermometer

[0105] 38: Control device

[0106] 40: Burner

[0107] 42: Thermal insulation

[0108] 44: Passage

[0109] 46: Pipeline

[0110] 48: Burner exhaust port

[0111] 50, 52, 54: Pipelines

[0112] 56: Condenser

[0113] 58: Fan

[0114] 60, 62: Piping

[0115] 64: There is a gap between the outer surface of the first pipe and the inner surface of the second pipe.

[0116] 66: Can

[0117] 68: pipe

[0118] 70: Opening and closing section

[0119] 72: Exhaust port.

Claims

1. A degreasing oven for degreasing materials, the degreasing oven comprising: The furnace body contains the degreased material; The burner ignites the gases discharged from the furnace body while simultaneously venting them. A condenser cools and condenses the gas discharged from the burner; The first pipe is connected to the exhaust port of the burner; The second pipe, equipped with the condenser, is annular and allows gas to enter from the first pipe; A fan is used to circulate gas in the second pipe; and The third pipe is used to discharge gas from the second pipe to the outside of the second pipe.

2. The degreasing oven according to claim 1, wherein, A portion of the first pipe enters the second pipe.

3. The degreasing oven according to claim 1 or 2, comprising an opening and closing part disposed in the second pipe and used to draw air from the outside of the second pipe into the second pipe.

4. The degreasing oven according to claim 1 or 2, comprising: A saturated vapor generating apparatus that uses the liquid generated when the gas is condensed using the condenser to generate saturated vapor; as well as The superheater superheats the saturated steam and generates superheated steam that enters the furnace body.

5. The degreasing oven according to claim 1 or 2, wherein, The condenser includes piping in which liquid generated during the condensation of gas flows.

6. The degreasing furnace according to claim 1 or 2, comprising a tank for storing liquid generated when the gas is condensed using the condenser.

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