CN116324322A

CN116324322A - Degreasing furnace

Info

Publication number: CN116324322A
Application number: CN202180063431.0A
Authority: CN
Inventors: 田中优
Original assignee: Shimadzu Corp
Current assignee: Shimadzu Corp
Priority date: 2021-02-26
Filing date: 2021-10-08
Publication date: 2023-06-23
Also published as: JPWO2022180918A1; KR20230047464A; WO2022180918A1

Abstract

Provided is a degreasing furnace wherein the load on a flow path of discharged gas is reduced. The degreasing furnace (10) is a degreasing furnace (10) for degreasing a degreased object (12), and the degreasing furnace (10) comprises: a furnace body (14) for accommodating the degreased object (12); a burner (40) for burning the gas discharged from the furnace body (14); and a condenser (56) that cools and condenses the gas discharged from the burner (40). The degreasing furnace (10) comprises: a first conduit (50) connected to an exhaust port (48) of the burner (40); a second pipe (52) provided with a condenser (56) in a ring shape, and into which gas is introduced from the first pipe (50); a fan (58) for flowing a gas in the second duct (52); and a third pipe (54) for discharging the gas from the second pipe (52) to the outside of the second pipe (52).

Description

Degreasing furnace

Technical Field

The invention relates to a degreasing furnace.

Background

Conventionally, a ceramic-containing object to be degreased is degreased by a degreasing furnace. For example, it is described that the furnace of patent document 1 described below includes: a furnace body for accommodating the degreased object and a heating component for heating the degreased object. The furnace of patent document 1 heats the defatted gas to decompose the organic substances. Then, water is sprayed into the gas flow path to reduce the temperature of the gas.

[ Prior Art literature ]

[ patent literature ]

Patent document 1: international publication No. WO2005/047207 (paragraph 0042)

Disclosure of Invention

[ problem to be solved by the invention ]

However, by spraying water onto the process gas, water may be stored in the gas flow path. The water may cause a load on the gas, and may not smoothly discharge the gas.

Accordingly, an object of the present invention is to provide a degreasing furnace in which the load of the discharged gas is reduced.

[ means of solving the problems ]

In order to solve the above problems, the degreasing furnace of the present invention includes the following structure.

The degreasing furnace according to the present invention is a degreasing furnace for degreasing an object to be degreased, the degreasing furnace including: a furnace body for accommodating the degreased object; a burner for burning the gas discharged from the furnace body; and a condenser that cools and condenses the gas discharged from the burner.

[ Effect of the invention ]

According to the present invention, by condensing the gas by the condenser, the liquid generated at this time is discharged, and the gas discharge path is not blocked by the liquid, so that the load of the gas can be reduced as compared with the prior art.

Drawings

Fig. 1 is a diagram showing a structure of a degreasing furnace of the present invention.

Fig. 2 is a view showing a condenser, a duct, and a fan.

Fig. 3 is a diagram showing a structure in which a first pipe enters a second pipe.

Fig. 4 is a diagram showing pipes of the condenser, (a) is a diagram showing a first pipe, and (b) is a diagram showing a second pipe.

Detailed Description

The degreasing furnace of the present invention will be described with reference to the drawings. Although the embodiments are described, the same reference numerals are given to the same components even in different embodiments, and the description thereof may be omitted.

Embodiment 1

The degreasing furnace 10 of the present application shown in fig. 1 includes a furnace body 14 accommodating the degreased objects 12, a saturated vapor generating device 18 for generating saturated vapor, and a superheater 20 for generating superheated vapor.

[ degreased object ]

The degreased object 12 includes a ceramic molded body. The ceramic comprises: nitride ceramics (aluminum nitride, silicon nitride, etc.), carbide ceramics (silicon carbide, boron carbide, etc.), oxide ceramics (aluminum oxide, zirconium, etc.). The degreased object 12 contains a binder. The binder is mixed with the ceramic material when the degreased object 12 is formed. The binder is released from the degreased object 12 in the form of gas by the temperature rise of the degreased object 12. As the binder, polybutylmethacrylate, polyvinyl alcohol, methylcellulose, vinyl acetate, polyethylene glycol, etc. are used, and a lubricant, a plasticizer, a dispersant are also used.

[ furnace body ]

The furnace body 14 includes a heat resistant material such as SUS310S or SUS 316L. The furnace body 14 is formed in a container shape, and the degreased object 12 is accommodated in the internal space 22 thereof. A door is provided at an arbitrary position of the furnace body 14, and is opened and closed when the degreased object 12 is discharged. A holder 24 for disposing the degreased object 12 may be included in the inner space 22 of the furnace body 14. The furnace body 14 is formed with a supply port 26 and an exhaust port 28. The superheated steam is supplied from the supply port 26 to the inner space 22 of the furnace body 14. The gas of the furnace body 14, which contains the components generated when the degreased object 12 is degreased, is discharged from the gas outlet 28.

[ saturated vapor generating device ]

Comprising a saturated vapor generating device 18 for supplying saturated vapor to a superheater 20. The saturated vapor generating device 18 includes a boiler that generates saturated vapor by boiling a liquid such as pure water.

[ superheater ]

The superheater (super) 20 is a device for generating superheated steam from saturated steam. The superheater 20 may be exemplified by: convection superheaters, radiant superheaters, suspension superheaters, screen superheaters, horizontal superheaters, and the like. The superheater 20 comprises a long tube in which saturated vapor flows. The saturated vapor flowing in the long tube is heated to become superheated vapor. The generated superheated steam is supplied to the furnace body 14. The superheated steam at this time is water (H) containing colorless and transparent water at a higher temperature than the saturated steam at 100℃ under normal pressure ₂ O) gas. The temperature of the superheated steam is 200℃or higher, preferably 500℃or higher, and more preferably 600℃to 1200 ℃.

The furnace main body 14 and the superheater 20, and the saturated vapor generating device 18 and the superheater 20 are connected by a pipe 30 and a pipe 32. Since the superheated steam at a high temperature flows through the pipe 30, the pipe 30 is preferably made of a heat-resistant material. Valves may be attached to the

pipes

30 and 32, and the flow rates of the saturated vapor and the superheated vapor may be controlled by opening and closing the valves.

[ thermometer ]

The present application includes a thermometer 36 for measuring the ambient temperature of the interior space 22 of the furnace body 14. The thermometer 36 utilizes a thermocouple thermometer. The temperature of which position of the furnace body 14 is measured is determined according to the design, and the number of the thermometers 36 is determined according to the design. The supply of superheated steam to the furnace body 14 is controlled by the measured temperature. Accordingly, the present application includes a control device 38 for controlling the superheater 20 and the saturated vapor generating device 18.

[ control device ]

The control device 38 is included, and the control device 38 is inputted with the temperature of the thermometer 36 to control the supply amount of the superheated steam to the furnace body 14 and the temperature of the superheated steam. The control device 38 includes an arithmetic circuit such as a central processing unit (Central Processing Unit, CPU) or a programmable logic controller (Programmable Logic Controller, PLC). The control device 38 controls the saturated vapor generating device 18 and the superheater 20, or controls valves of the piping 30 and the piping 32.

[ burner ]

The degreasing furnace 10 of the present application includes a burner 40, and the burner 40 serves as a passage of gas of the furnace body 14 and burns 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 the heat insulator 42 and a heating device (not shown). The heating device is an electric heater, a gas burner or a heavy oil burner, etc. The gas released from the degreased object 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 the gas into a gas such as carbon dioxide.

[ pipeline ]

The degreasing furnace 10 of the present application includes a duct 46, and the gas flowing through the burner 40 in the duct 46 is exhausted (fig. 2). The duct 46 includes: a first conduit 50 connected to the exhaust port 48 of the burner 40; a second pipe 52 formed in a ring shape; and a third pipe 54 for exhausting the gas. The

pipes

50, 52, 54 are cylindrical, and gas flows through them.

The first duct 50 is a passage for gas to flow from the burner 40 to the second duct 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 a passage for discharging gas, which is connected to the second pipe 52.

From the third duct 54, the gas is led from the burner 40 via the first duct 50 to the second duct 52, through a portion of the first duct 50, into the inside of the second duct 52 (fig. 3). There is a gap 64 between the outer surface of the first conduit 50 and the inner surface of the second conduit 52. A part of the first duct 50 is arranged at a corner portion of the second duct 52 having a square shape. The gas circulated in the second pipe 52 hits a portion of the first pipe 50, which is caught in the gas entering the second pipe 52 from the first pipe 50, and circulates again in the second pipe 52. The gas discharged from the first pipe 50 is mixed with the gas circulated in the second pipe 52, and the temperature of all the gas circulated in the second pipe 52 can be lowered. The gas is easily condensed by a condenser 56 described later.

The third conduit 54 is connected to the second conduit 52. The connected portion is where the first conduit 50 enters the second conduit 52. The third duct 54 is installed in such a manner as to face in the opposite direction to the flow of the gas in the first duct 50. A part of the gas circulating in the second pipe 52 and contacting the first pipe 50 again circulates in the second pipe 52, and the remaining part is guided to the third pipe 54 to be discharged. By discharging a part of the gas, the pressure of the furnace body 14 and the burner 40 is prevented from decreasing.

[ condenser ]

The present application includes a condenser 56. A condenser 56 is provided in the second pipe 52 to cool and condense the gas flowing in the second pipe 52. The condenser 56 includes a spiral first pipe 60 (fig. 4 a) disposed in the second pipe, a U-shaped second pipe 62 (fig. 4 b) attached to the outer surface of the second pipe 52, and a pump (not shown) for flowing the cooling liquid through these

pipes

60 and 62. The cooling liquid flows through the first pipe 60 and the second pipe 62. The first pipe 60 directly cools the gas. The second pipe 62 cools the second duct 52, and cools the gas contacting the inner surface of the second duct 52. The high-temperature gas passing through the burner 40 is cooled and condensed by the condenser 56. Moisture contained in the gas is present as dew on the surface of the pipe 60 of the condenser 56 and the inner surface of the second pipe 52. 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.

[ Fan ]

Including a fan 58, which fan 58 controls the flow of gas in the duct 46. Fan 58 uses a sirocco fan (sirocco fan). The fan 58 is disposed downstream of the condenser 56 in the gas flow of the second duct 52. Since the temperature of the gas is lowered in the condenser 56, the high-temperature gas does not touch the fan 58, so that the fan 58 can be protected.

[ can ]

The degreasing furnace 10 of the present application includes a tank 66, and the tank 66 stores liquid generated when the gas is condensed by the condenser 56. A pipe 68 is provided at a lower portion of the second pipe 52. Liquid flows from the lower portion of the second conduit 52 through a pipe 68 to the tank 66. By discharging the liquid from the second pipe 52, the liquid does not become a load of the gas flowing in the second pipe 52.

[ degreasing method ]

Next, a degreasing method using the degreasing furnace 10 will be described. (1) The degreased object 12 is accommodated in the inner space 22 of the furnace body 14. For example, the object 12 to be degreased is a molded article including nitride-based ceramics.

(2) The saturated vapor generating device 18 heats the liquid to generate saturated vapor, and supplies the saturated vapor to the superheater 20. The superheater 20 generates superheated steam from saturated steam. The superheated steam is supplied to the furnace body 14. The degreased object 12 is degreased by the superheated steam.

(3) The gas generated when degreasing the degreased object 12 is supplied from the exhaust port 28 to the burner 40, and burned to become carbon dioxide or the like.

(4) Gas flows from the burner 40 through a first conduit 50 to a second conduit 52. The gas introduced into the second duct 52 flows in the second duct 52 by rotation of the fan 58, and is cooled and condensed by the condenser 56 located midway thereof. The liquid produced in the condenser 56 flows by gravity to the lower portion of the second conduit 52 and is stored in a tank 66 through a pipe 68. The liquid stored in the tank 66 is discharged.

(5) The gas flowing in the second duct 52 collides with a portion of the first duct 50 that enters the interior of the second duct 52. A portion of the gas mixes with the gas passing from the first conduit 50 into the second conduit 52 and again flows in the second conduit 52. The remaining gas enters the third conduit 54 from the second conduit 52 and is exhausted.

As described above, in the present application, the discharged gas is condensed by the condenser 56, and the generated liquid is stored in the tank 66, whereby the liquid is not stored in the exhaust path, and thus the flow of the gas is not blocked. Since the exhaust is smoothly performed, the state of the gas in the internal space 22 of the furnace body 14 is easily controlled, and the degreasing is easily performed to a desired state.

Embodiment 2

The second duct 52 may include an opening and closing part 70 (fig. 2, 3) for connecting the inside with the outside. When the opening/closing portion 70 is opened, the inside of the second duct 52 is opened with respect to the outside. An external gas may 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 lowered and condensed. The opening/closing area of the opening/closing portion 70 can be appropriately adjusted. The amount of external air flowing into the second duct 52 can be adjusted.

The opening/closing portion 70 is provided in the second duct 52 in the vicinity of the exhaust port 72 of the first duct 50 and downstream of the exhaust port 72 (fig. 3). The gas enters the second duct 52 from the first duct 50, and the external gas passes through the opening/closing part 70 so as to be involved in the flow of the gas.

Embodiment 3

The saturated vapor generating device 18 may utilize the liquid generated in the condenser 56 to generate saturated vapor. Tank 66 is connected to saturated vapor generating device 18. The liquid generated in the condenser 56 is stored in the tank 66, and the saturated vapor generating device 18 generates saturated vapor using the liquid. If the tank 66 is not sufficiently liquid, the saturated vapor generating device 18 may be replenished with liquid from another device. The liquid generated in the condenser 56 may be directly supplied to the saturated vapor generating device 18 without using the tank 66.

The liquid supplied to the saturated vapor generating device 18 is not limited to the liquid. Various liquids such as a liquid flowing through a tap water pipe and a liquid obtained by filtering a liquid such as well water with a filter can be used.

Embodiment 4

The condenser 56 may also cause the liquid stored in the tank 66 to flow to the piping 60 and the piping 62. The pump included in the condenser 56 causes the liquid stored in the tank 66 to flow to the piping 60 and the piping 62. If the liquid in the tank 66 is insufficient for the liquid flowing into the piping 60 and the piping 62, the liquid may be added separately.

Embodiment 5

The saturated vapor generating device 18 may generate saturated vapor by using the liquid flowing through the

pipes

60 and 62 of the condenser 56. When the liquid flows through the

pipes

60 and 62 of the condenser 56, the temperature rises, and saturated vapor is easily generated in the saturated vapor generating device 18.

Embodiment 6

A thermometer may also be included that measures the temperature of the gas in the second conduit 52. The temperature of the thermometer may be input to the control device 38. The control device 38 may control the rotation speed of the fan 58 or control the pump of the condenser 56 to control the flow rate of the liquid flowing through the

pipes

60 and 62. The condensation of the gas may be controlled so that the gas may be prevented from flowing to the third pipe 54 in a high temperature state to be cooled and condensed in the third pipe 54.

A thermometer may also be included in at least one of the first and

third conduits

50, 54 to measure the temperature of the gas. The measured temperature may be input to the control device 38, and the control device 38 may control the pumps of the fan 58 and condenser 56.

Further, a thermometer may be included to measure the temperature of the liquid flowing through the

pipes

60 and 62. The temperature measured by the thermometer is input to the control device 38. If the temperature of the liquid is higher than the predetermined value, the controller 38 may stop the degreasing furnace 10. The piping 60, the piping 62, and the like are protected.

Embodiment 7

The condenser 56 uses cooling by liquid, but a fan for blowing air to the outer surface of the second duct 52 may be additionally provided.

Embodiment 8

The liquid may also be directly discharged from the second conduit 52. If liquid is not stored in the second conduit 52, there may be a tank 66.

Embodiment 9

In the above embodiment, the degreasing furnace using superheated steam is used, but the degreasing furnace 10 of the present application is not limited to the configuration using superheated steam. For example, the inert gas may be introduced into the furnace body before the superheated steam is introduced into the furnace body 14, and the preheating may be performed. Therefore, a gas source of inert gas may also be included to raise the temperature of the inert gas in the superheater 20. After the temperature of the degreased object 12 is raised by the inert gas, superheated steam is put into the furnace body 14. In degreasing, since the temperature of the object 12 is low at first, condensation on the surface of the object 12 may occur when superheated steam is first introduced, and the object 12 may be degraded. By preheating the degreased object 12 by putting the inert gas having a temperature increased in the furnace body 14 before the superheated steam, condensation does not occur on the surface of the degreased object 12 when the superheated steam is put in, and thus desired degreasing can be performed.

Embodiment 10

The temperature of the thermometer 36 inputted to the control device 38, the control state of the superheater 20 and the like by the control device 38, and the like can be transmitted to a predetermined computer via a network. The degreasing state can be remotely confirmed. The data transmitted from the control device 38 may be recorded in the server.

The degreasing furnace according to the first aspect is a degreasing furnace for degreasing an object to be degreased, the degreasing furnace including: a furnace body for accommodating the degreased object; a burner for burning the gas discharged from the furnace body; and a condenser that cools and condenses the gas discharged from the burner.

According to the degreasing furnace of the first aspect, the gas is condensed by the condenser, and the condensation of the gas in the middle of the exhaust gas can be prevented from becoming a load of the exhaust path.

(second item) the degreasing furnace comprises: the first pipeline is connected with an exhaust port of the combustor; a second pipe provided with the condenser, formed in a ring shape, and into which gas is introduced from the first pipe; a fan for flowing a gas in the second duct; and a third pipe for discharging the gas from the second pipe to the outside of the second pipe.

According to the degreasing furnace of the second claim, the gas may be condensed while circulating the gas in the second duct by the fan.

(third) a portion of the first conduit enters a second conduit.

According to the degreasing furnace of the third claim, the circulating gas can be made to touch the first pipe through the first pipe into the second pipe, and a part of the gas can be circulated again. The temperature of the gas flowing in the second pipe can be lowered so that it becomes easy to condense.

The degreasing furnace according to the fourth aspect includes an opening/closing portion provided in the second duct and configured to take in air from outside the second duct into the second duct.

According to the degreasing furnace of the fourth aspect, the outside air is introduced into the second duct from the outside through the opening/closing portion, and the temperature of the air is reduced to facilitate condensation.

(fifth item) the degreasing furnace comprises: a saturated vapor generating device that generates saturated vapor using a liquid generated when the gas is condensed by the condenser; and a superheater that superheats the saturated vapor and generates superheated vapor that enters the furnace body.

According to the degreasing furnace of the fifth aspect, by reusing the liquid generated by condensation for the generation of superheated vapor, the liquid can be circulated, and thus the environmental load can be reduced.

The condenser according to the sixth aspect includes a pipe, and the liquid generated when the gas is condensed by the condenser flows through the pipe.

According to the degreasing furnace of the sixth aspect, the environmental load can be reduced by flowing the liquid generated in the condenser through the piping of the condenser.

The degreasing furnace of (seventh) comprises a tank storing a liquid generated when the gas is condensed by the condenser.

According to the degreasing furnace of the seventh aspect, the liquid produced by condensation can be stored in the tank, and various stored liquids can be utilized.

In addition, the present invention can be implemented in various forms of improvement, modification, and variation based on the knowledge of those skilled in the art without departing from the gist thereof. The embodiments described are not independent and can be implemented in suitable combinations based on knowledge of a person skilled in the art.

[ Industrial applicability ]

The present invention can provide a degreasing furnace with reduced load of discharged gas.

[ description of symbols ]

10: degreasing furnace

12: degreased object

14: furnace body

18: saturated vapor generating device

20: superheater with a heat exchanger

22: internal space of furnace body

24: support frame

26: supply port

28: exhaust port

30. 32: piping arrangement

36: thermometer

38: control device

40: burner with a burner body

42: heat insulator

44: passage way

46: pipeline

48: exhaust port of burner

50. 52, 54: pipeline

56: condenser

58: fan with fan body

60. 62: piping arrangement

64: a gap is formed between the outer surface of the first pipeline and the inner surface of the second pipeline

66: tank

68: pipe

70: opening and closing part

72: and an exhaust port.

Claims

1. A degreasing furnace for degreasing a degreased object, the degreasing furnace comprising:

a furnace body for accommodating the degreased object;

a burner for burning the gas discharged from the furnace body; and

and a condenser for cooling and condensing the gas discharged from the burner.

2. The degreasing furnace of claim 1, comprising:

the first pipeline is connected with an exhaust port of the combustor;

a second pipe provided with the condenser, formed in a ring shape, and into which gas is introduced from the first pipe;

a fan for flowing a gas in the second duct; and

and a third pipe for discharging the gas from the second pipe to the outside of the second pipe.

3. The degreasing furnace of claim 2, wherein a portion of the first conduit enters the second conduit.

4. A degreasing furnace according to claim 2 or 3, comprising an opening and closing portion provided to the second duct and configured to take in air into the second duct from outside the second duct.

5. A degreasing furnace according to any of claims 1 to 3, comprising:

a saturated vapor generating device that generates saturated vapor using a liquid generated when the gas is condensed by the condenser; and

and a superheater which superheats the saturated steam and generates superheated steam which enters the furnace body.

6. A degreasing furnace according to any one of claims 1 to 3, wherein the condenser includes a pipe, and a liquid generated when the gas is condensed by the condenser flows through the pipe.

7. A degreasing furnace according to any of claims 1 to 3, comprising a tank storing liquid produced when condensing gas with the condenser.