KR20170052363A - Energy saving type gas carburizing machine and control method thereof - Google Patents

Abstract

An invention for an energy-saving gas carburizing apparatus is disclosed. An energy saving gas carburizing apparatus according to the present invention comprises: a gas supply unit for supplying a gas used for gas carburization; a carburizing unit for supplying gas through the gas supply unit and heating the heat treatment product to carry out gas carburization; Gas which is not used for gas carburization is discharged from the cooling part where cooling of the heat treatment product is performed and the gas discharged from the cooling part is recovered and the gas used for gas carburization is recovered and supplied to the carburizing part And the like.

Description

TECHNICAL FIELD [0001] The present invention relates to an energy saving gas carburizing apparatus,

The present invention relates to an energy saving gas carburizing apparatus and a control method thereof, and more particularly, to an energy saving gas carburizing apparatus and a control method thereof that can reduce the amount of gas used for gas carburizing to reduce the production cost.

In general, a surface hardening treatment method for hardening the surface of a material to be treated for heat treatment to improve mechanical properties such as abrasion resistance, fatigue resistance and impact toughness includes a method of locally heat treating only the surface of the object to be treated, A method in which a hard alloy layer is formed by diffusion, penetration or forced injection into a treated material to react with a base metal, and a method in which a hard layer material is coated on the surface of a base metal to form a separate layer.

  In the surface hardening treatment method, there is a deep-part hardening method in which the entirety of the object to be treated is hardened through quenching or the like, and a surface hardening method in which only the outer surface is hardened while maintaining the properties of the object to be treated.

Such a surface hardening treatment method can be largely divided into a carburizing method of injecting carbon from the surface of the object to be treated and a nitriding method of injecting nitrogen. Carburizing methods include solid carburizing, gas carburizing, and bathing carburizing. Nitriding methods include gas nitriding, salt bath nitriding, and plasma nitriding. Carbonitriding is a method of simultaneously treating carburization and nitriding.

Mainly used carburizing heat treatment is gas carburizing method, it is easy to control the surface carbon concentration (Carbon potential) and it is possible to obtain uniform carburizing layer, and it is suitable for mass production because it is continuous and automatable.

The carburizing and nitriding method is used to obtain the hardness higher than the hardness of the carburizing layer in a way that carburizing and nitriding occur simultaneously. As the use conditions of automobiles and machine parts become severe, quality and durability are required, and the importance of surface heat treatment is increasing day by day. Of these, the carburizing and nitriding carburizing process is one of the surface hardening methods of steel materials, and can easily improve the mechanical properties of the product surface, and is used for automobile parts, molds, heavy equipment parts, machine parts, and display parts.

Conventionally, there is a problem that the production cost is increased because a large amount of gas is supplied to the apparatus compared to the gas used for gas carburization. Therefore, there is a need for improvement.

BACKGROUND ART [0002] The background art of the present invention is disclosed in Korean Patent Laid-Open Publication No. 2012-0130776 (published on Dec. 3, 2012, entitled "Continuous gas carburizing section").

It is an object of the present invention to provide an energy-saving gas carburizing apparatus and a control method thereof, which can reduce a production cost by reducing an amount of gas used for gas carburization.

The energy saving gas carburizing apparatus according to the present invention comprises: a gas supply unit for supplying a gas used for gas carburization; a carburizing unit for supplying gas through the gas supply unit and heating the heat treatment product to carry out gas carburization; The gas supplied to the carburizing portion is transferred, the cooling portion where the heat treatment product is cooled, and the gas which is not used for gas carburization among the gas discharged from the cooling portion is discharged, and the gas used for gas carburization is recovered and supplied to the carburizing portion And a recovery unit.

According to the present invention, there is also provided a gas analyzer for analyzing a component of a gas, which is connected to a carburizing portion, a cooling portion, and a gas recovering portion and which is located inside the carburizing portion, And a control unit for receiving the measured values of the gas analysis unit and controlling the operation of the gas supply unit and the gas recovery unit to adjust the gas components inside the carburizing unit.

The gas supply portion may include a first supply portion for supplying the modifying gas to the carburizing portion, a second supply portion for supplying the hydrocarbon gas, which is hydrocarbon-based, to the carburizing portion, and a third supply portion for supplying the ammonia gas used for nitriding to the carburizing portion desirable.

The first supply unit includes a first gas supply unit for supplying propane gas, a second gas supply unit for supplying air, a metamorphic unit connected to the first gas supply unit and the second gas supply unit and mixing propane gas and air, A first connection pipe connecting the denatured portion and the carburizing portion, and a first control valve disposed in the first connection pipe to control the movement of the fluid.

The second supply unit includes a first storage tank for storing the hydrocarbon-based raw gas, a second connection channel for connecting the first storage tank and the carburizing unit, and a second control valve installed in the second connection channel for controlling the movement of the fluid. .

The third supply unit includes a second storage tank in which ammonia gas is stored, a third connection channel connecting the second storage tank and the carburizing unit, and a third control valve installed in the third connection channel for controlling the movement of the fluid .

The gas recovery unit may include a first filter unit for separating the hydrogen gas from the gas discharged from the cooling unit and transferring the hydrogen gas to the burner unit, and a second filter unit for separating the nitrogen contained in the gas passing through the first filter unit and transferring the nitrogen to the burner unit .

The first filter unit may include an inner filter that is formed of a porous film and separates hydrogen gas from the gas discharged from the cooling unit, and an outer filter that surrounds the inner filter and is disposed outside the inner filter and separates the hydrogen gas from the gas discharged from the inner filter. It is preferable to include a filter.

Further, it is preferable that the second filter unit uses a membrane filter.

It is preferable that the gas recovery unit further includes a return pipe for supplying the gas that has passed through the second filter to the carburizing unit and a re-supply valve for controlling the flow of the fluid, which is provided in the return pipe.

According to another aspect of the present invention, there is provided a gas analyzer comprising: a first conduit connecting a gas analyzing section and a carburizing section; a first valve provided in the first conduit for controlling the flow of the fluid; a second conduit connecting the gas analyzing section and the cooling section; And a second valve disposed in the second fluid passage and controlling the flow of the fluid.

It is preferable that the present invention further includes a third conduit connecting the gas analysis unit and the gas recovery unit, and a third valve installed in the third conduit for controlling the flow of the fluid.

The control unit preferably controls the operation of the first valve, the second valve, and the third valve to control the flow of the gas to the gas analysis unit.

A control method of an energy saving gas carburizing apparatus according to the present invention includes the steps of: supplying gas to a carburizing section by operation of a gas supplying section; analyzing gas components of a carburizing section, a cooling section, and a gas recovering section in a gas analyzing section; A step of determining whether additional supply of gas to the carburizing section is necessary in the control section receiving the measured value of the gas analyzing section, And determining whether or not the carburizing operation has been completed.

The energy saving gas carburizing apparatus and the control method thereof according to the present invention recover gas usable for gas carburization among the gas discharged from the cooling section through the gas collecting section and supply the gas to the carburizing section again so that the amount of gas used for gas carburizing The production cost can be reduced.

FIG. 1 is a schematic view showing a main configuration of an energy-saving gas carburizing apparatus according to an embodiment of the present invention.
2 is a front view schematically showing a gas recovery unit according to an embodiment of the present invention.
3 is a perspective view schematically showing a gas recovery unit according to an embodiment of the present invention.
4 is a block diagram of an energy-saving gas carburizing apparatus according to an embodiment of the present invention.
5 is a flowchart illustrating a method of controlling an energy-saving gas carburization apparatus according to an embodiment of the present invention.

Hereinafter, an energy saving gas carburizing apparatus and a control method thereof according to an embodiment of the present invention will be described with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation.

Further, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

2 is a front view schematically showing a gas recovery unit according to an embodiment of the present invention. FIG. 3 is a cross-sectional view of the gas- 4 is a block diagram of an energy saving gas carburizing apparatus according to an embodiment of the present invention.

1 to 4, an energy-saving gas carburizing apparatus 1 according to an embodiment of the present invention includes a gas supply unit 10, a carburizing unit 50, a cooling unit 60, (70), a gas analyzer (80), and a controller (100).

The gas supply unit 10 supplies gas used for gas carburization. The gas supply unit 10 according to the embodiment includes a first supply unit 20 for supplying a metamorphic gas to the carburizing unit 50 and a second supply unit 30 for supplying the hydrocarbon gas, And a third supply part 40 for supplying ammonia gas used for nitriding to the carburizing part 50.

The gas carburization method using the energy-saving gas carburizing apparatus 1 according to the embodiment is a method in which the gas containing the denatured gas and the hydrocarbon is supplied to the carburizing section 50 into which the heat-treated product 120 is introduced, It is a method of solidifying in the austenite (γ-Fe) iron because the activated carbon is precipitated by heating the raw gas.

The denatured gas is also referred to as RX gas, and is a gas in which hydrocarbon gas and air are mixed at a certain ratio.

Another example of the hydrocarbon gas is a gas containing natural gas, methane gas (CH4), butane (C4H10), ethylene (C2H4), propane gas (C3H8), acetylene (C2H2) Propane gas is used.

After the heat treated product 120 is carburized in the carburizing portion 50, the heat treated product 120, which is the object to be processed, is quenched in the cooling portion 60 in which the cooling oil is loaded to secure hardness and wear resistance.

 The nitridation method decomposes ammonia (NH 3) gas at a high temperature of 500 ° C. to 550 ° C. to permeate nitrogen (N) into the metal surface of the heat treated product 120 to form a nitride layer of nitrogen compounds (Fe 4 N, Fe 2 N).

The first supply part 20 of the gas supply part 10 supplies RX gas, which is a denaturating gas. In more detail, the first gas supply unit 22 supplies propane gas and the second gas supply unit 24 supplies air. The propane gas and air are mixed in the metering section (26), and the mixed gas is used as the metering gas. The denatured gas is a mixture of propane gas (C3H8) and air at a ratio of 7.5: 1. The weight ratio of each component in the denatured gas is 23.1 wt% of CO, 30.8 wt% of H2, 46.2 wt% of N2, and the balance of H ₂ O, CO ₂ and O ₂ .

The second supply part 30 of the gas supply part 10 supplies a raw gas called rich gas and the ammonia gas used for nitriding is supplied from the third supply part 40 of the gas supply part 10.

A carburizing gas of 0.8 Nm ² / h per 1 m ^{2 of} carburizing portion 50 is involved in carburizing, but actually carburizing portion 50 is supplied with carburizing gas of 8 to 15 Nm ² / h which is at least 10 times greater than this. When the extra carburizing gas that has not been involved in carburization flows into the cooling section 60, the pressure of the cooling section 60 rises. When the heat treated product 120 as the object to be processed is put into the cooling oil of the cooling section 60, the temperature of the cooling section 60 rises and the internal pressure of the cooling section 60 also rises.

If negative pressure below the atmospheric pressure is generated inside the cooling section 60, there is a danger of explosion when the outside air flows into the inside of the cooling section 60. Accordingly, hydrogen and nitrogen in the gas inside the cooling unit 60 are filtered through the gas recovery unit 70 and transferred to the burner unit 110 for burning, thereby reducing the risk of explosion. When the gas is directly discharged to the atmosphere through the burner unit 110, the gas is burned together with the gas components which may be explosive.

The first supply unit 20 according to one embodiment includes a first gas supply unit 22 for supplying propane gas, a second gas supply unit 24 for supplying air, a first gas supply unit 22, A metering section 26 connected to the gas supply section 24 for mixing propane gas and air and a first connecting conduit 28 connecting the metering section 26 and the carburizing section 50 and a first connecting conduit 28 And a first control valve 29 for controlling the movement of the fluid.

Propane gas is stored inside the first gas supply unit 22 and propane gas is supplied toward the denatured unit 26. The second gas supply unit 24 may be modified in various ways within the scope of the technical idea of supplying air to the metering unit 26.

The modifying unit 26 may use a variety of mixing apparatuses in the art of mixing propane gas supplied from the first gas supply unit 22 and air supplied from the second gas supply unit 24 in a predetermined ratio. The denaturing gas, which is RX gas mixed in the denaturing section 26, is mixed with propane gas and air at a ratio of 7.5: 1.

When propane gas (C3H8) is used as a rich gas at 835 DEG C, the decomposition ratio is a ratio of CH4: 50.7 wt%, C2H4: 37.6 wt%, C2H6: 6.4 wt%, C3H6: 2.5 wt%, and C3H8: 2.8 wt% .

The metering section 26 is connected to the carburizing section 50 by a first connection conduit 28. A first control valve 29 operated by a control signal of the control section 100 is installed in the first connection conduit 28 Thereby regulating the supply amount of the denatured gas.

The second supply unit 30 according to one embodiment includes a first storage tank 32 storing hydrocarbon gas and a second connection pipe connecting the first storage tank 32 and the carburizing unit 50 And a second control valve (36) provided in the second connection pipe (34) and controlling the movement of the fluid.

A propane gas (C3H8) which is a rich gas or a rich gas is stored in the low storage tank 1 and a second connection pipe 34 is connected to the first storage tank 32 and the carburizing unit 50. [ A second control valve (36) operated by a control signal of the controller (100) is provided in the second connection pipe (34) to adjust the supply amount of the carburizing gas.

After the rich gas of 3% is put into the carburizing portion 50, the approximate gas components in the carburizing portion 50 are 22.4 wt% of CO, 29.8 wt% of H2, 44.8 wt% of N2, 1.5 wt% of CH4 , C2H4: 1.1 wt%, C2H6: 0.2 wt%, C3H6: 0.1 wt% and C3H8: 0.1 wt%, and the other components are H ₂ O, CO ₂ , O ₂ and the like.

The carburizing gas used in the carburizing furnace of the present invention is usually mixed with RX gas and rich gas, and the RX gas and the rich gas are supplied to the carburizing section 50 and the cooling section 60 through the gas supplying section 10 .

The gas supply unit 10 according to one embodiment includes a first supply unit 20 for supplying RX gas and a second supply unit 30 for supplying a rich gas, and the RX gas and the rich gas And the mixture is supplied to the carburizing section 50 and the cooling section 60 at a proper ratio.

The second control valve 36 operated by the control signal of the controller 100 adjusts the supply amount of the rich gas for increasing the carbon potential in the carburizing portion 50.

The third supply unit 40 according to one embodiment includes a second storage tank 42 storing ammonia gas and a third connection pipe 44 connecting the second storage tank 42 and the carburizing unit 50, And a third control valve (46) provided in the third connection pipe (44) for controlling the movement of the fluid.

Ammonia gas is stored in the second storage tank 42 and the second storage tank 42 and the carburizing unit 50 are connected to the third connection pipe 44. A third control valve 46 operated by a control signal of the controller 100 is provided in the third connection line 44 to regulate the supply amount of the ammonia gas. Ammonia gas is used for carburizing nitrification.

The carburizing part 50 is supplied with the gas through the gas supply part 10 and can be deformed into various shapes within the technical idea of heating the heat treatment product 120 to carry out gas carburization. A heating heater and a gas agitating device for heating and carburizing and carburizing nitriding are provided on the inner side of the carburizing part 50 according to an embodiment and are connected to the gas supplying part 10.

The carburizing portion 50 and the cooling portion 60 are partitioned by the partition wall member 55. The carburizing portion 50 is provided with a cooling portion 60 successively. The partition wall member 55 is provided with a connection hole 56 and the carburizing gas in the carburizing portion 50 is moved to the cooling portion 60 through the connection hole 56. [ An isolation valve is provided in the connection hole 56 of the partition member 55 and is cut off when the carburization part 50 carries out cooling and the cooling part 60 is cooled.

The cooling unit 60 communicates with the carburizing unit 50 to move the gas supplied to the carburizing unit 50, and the heat treatment product 120 is cooled. A door for moving the heat-treated product 120 is provided at one side of the cooling unit 60.

Part of the hydrogen gas and nitrogen gas in the gas transferred from the cooling unit 60 to the gas recovery unit 70 is discharged to the atmosphere while the other decomposed and non-decomposed hydrocarbon gas is discharged through the gas recovery unit 70, (50). ≪ / RTI > The gas recovery unit 70 recovers various gas recovered from the gas discharged from the cooling unit 60, that is, gas that is not used for gas carburization, gas recovered from the gas carburization and supplied to the carburizing unit 50 Device may be used. The gas recovery unit 70 according to one embodiment includes a first filter unit 72, a second filter unit 76, a return duct 78, and a re-supply valve 79.

The first filter unit 72 separates the hydrogen gas from the gas discharged from the cooling unit 60 and transfers the hydrogen gas to the burner unit 110. The first filter unit 72 according to the first embodiment includes an inner filter 73 that is formed of a porous film and separates the hydrogen gas from the gas discharged from the cooling unit 60 and an inner filter 73 that surrounds the inner filter 73, And an outer filter 74 installed outside the inner filter 73 to separate the hydrogen gas from the gas discharged from the inner filter 73.

The first filter portion 72 is used for separating only hydrogen from a gas mixed with a hydrocarbon-based gas, a nitrogen gas, and a hydrogen gas. The hydrogen separation membrane used in the first filter portion 72 is a porous siloxane- Lt; / RTI >

The inner filter 73 and the outer filter 74 have a double pipe structure and the outer filter 74 is provided outside the inner filter 73.

The inner filter 73 may be modified in various ways within the scope of a technical idea using a porous membrane. In the inner filter 73 according to an embodiment, a siloxane-based polymer membrane without metal addition is used.

Since the hydrogen separation performance of the inner filter 73 can be set lower than that of the outer filter 74, it is manufactured with a high hydrogen permeability coefficient as compared with the outer filter 74. Therefore, the inner filter 73 can transmit a sufficient amount of the mixed gas even at the surface area narrower than the surface area of the outer filter 74.

The inner filter 73 according to one embodiment is manufactured by the sol-gel method. (Zr, Ti, Mn, Pt, Ru, K, Fe, etc.) is not added to the colloidal sol used for forming the hydrogen separation membrane. 1.0 g of acetic acid and water are added to make a total volume of 500 ml. Then, while stirring with heating, water is added together with the operation so that the concentration of the solution is kept constant.

The colloidal sol solution thus prepared is coated on an alumina tube coated with alpha-alumina fine particles, followed by firing at 570 ° C, and this operation is repeated several times to produce an inner filter 73.

The outer filter 74 is formed into a cylindrical shape using a siloxane-based polymer membrane to which a metal is added. Therefore, the hydrogen permeation amount can be larger than that of the hydrogen separation membranes having different shapes.

The outer filter 74 according to one embodiment is manufactured by the sol-gel method. Add a metal additive (Zr, Ti, Mn, Pt, Ru, K, Fe, etc.) to the colloidal sol used for forming the hydrogen separation membrane and stir. Add 11 g of hydrochloric acid and water to make the total volume to 500 ml. When stirring while heating, water is added so that the concentration of the solution is kept constant.

The colloidal sol solution obtained by this method is coated on a porous alumina tube coated with alpha-alumina fine particles and fired at 400 ° C to 800 ° C to produce an outer filter 74.

The second filter unit 76 separates the nitrogen contained in the gas passing through the first filter unit 72 and transfers the nitrogen to the burner unit 110. The second filter portion 76 according to one embodiment uses a membrane filter. Nitrogen gas in the gas that has passed through the first filter unit 72 is separated through the membrane filter of the second filter unit 76 and then transferred to the burner unit 110.

The return duct 78 forms a duct for supplying the gas that has passed through the second filter to the carburizing section 50. The re-supply valve 79 operated by the control signal of the controller 100 is installed in the return pipe 78 to control the flow of the fluid.

The gas analyzing unit 80 is connected to the carburizing unit 50, the cooling unit 60 and the gas returning unit 70 through a pipe and is connected to the gas component in the inside of the carburizing unit 50, And a gas component moving through the gas recovery unit 70, and transmits the measurement value to the controller 100. [0035]

Both the blower section and the cooling section 60 maintain a pressure higher than atmospheric pressure, but the gas analyzer 80 maintains atmospheric pressure or vacuum.

A residual gas analyzer (RGA) 80 is a quadrupole mass spectrometer having a mass range of 1 - 100 amu (atomic mass unit) or 1 - 200 amu, which measures the residual gas in the vacuum system, It is an analyzer used to monitor changes in reaction gas or product gas in a process system.

The resolution of the gas analyzer 80 is sufficient if it is possible to separate peaks of 1 amu difference, and since it is rare to have a mass of 200 amu or more as a gas component, the 200 amu mass range is also sufficient. It is possible to monitor in real time the chemical reaction occurring in the gas components or the system inside the carburizing section 50 and the cooling section 60 through analysis of the composition of the residual gas in the gas analyzing section 80.

The first conduit 90 connects the gas analysis unit 80 and the carburizing unit 50 and the first valve 96 operated by the control signal of the controller 100 is installed in the first conduit 90, . The first valve 96 performs a regulating valve function to send the gas inside the carburizing section 50 to the gas analyzing section 80.

The second conduit 92 connects the gas analysis unit 80 and the cooling unit 60 and the second valve 98 operated by the control signal of the control unit 100 is installed in the second conduit 92, . The second valve 98 performs a regulating valve function to send the gas inside the cooling unit 60 to the gas analysis unit 80.

The third conduit 94 connects the gas analysis unit 80 and the gas recovery unit 70 and the third valve 99 operated by the control signal of the control unit 100 is installed in the third conduit 94 Control the flow of fluid.

The control unit 100 receives the measured value of the gas analysis unit 80 and controls the operation of the gas supply unit 10 and the gas recovery unit 70 to adjust the gas component inside the carburization unit 50. The controller 100 further includes a re-supply valve 79, a first regulating valve 29, a second regulating valve 36, a third regulating valve 46, a first valve 96 and a second valve 98, And the third valve (99). The gas analyzer 80 can analyze the components of the gas in the carburizing part 50, the cooling part 60 and the gas returning part 70 by means of the control part 100, ) Can be supplied with additional components of the gas. That is, the control unit 100 controls the operation of the first valve 96, the second valve 98, and the third valve 99 to control the flow of gas to the gas analysis unit 80.

The burner unit 110 is connected to the gas recovery unit 70 and serves to receive and burn hydrogen and nitrogen. The burner unit 110 according to one embodiment is connected to the first filter unit 72 and the second filter unit 76, respectively, and a pipe for exhausting gas is provided on the upper side. The burner unit 110 receives hydrogen through the first filter unit 72 and receives nitrogen through the second filter unit 76 and burns it immediately before discharging it to the atmosphere.

A discharge pipe 140, which is a guide pipe for discharging the gases burned in the burner unit 110 to the atmosphere, is installed above the burner unit 110.

The heat treatment product 120 is supplied to the inner side of the carburizing portion 50 to be carburized and then moved to the cooling portion 60 to be cooled and then supplied to the oil cooler 60 connected to the cooling portion 60, 130) and cooled again. Oil inside the oil tank 130 is filled with oil, which is a cooling medium, and a stirring fan for facilitating the circulation of the oil is provided.

Hereinafter, a control method of the energy saving gas carburizing apparatus 1 according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

5 is a flowchart illustrating a method of controlling an energy-saving gas carburization apparatus according to an embodiment of the present invention.

1, 4 and 5, the control method of the energy-saving gas carburizing apparatus 1 according to the embodiment of the present invention is a method of controlling the gas- (Step S10).

In the initial stage, when the amount of gas set in the carburizing section 50 is supplied, the gas is discharged into the atmosphere after filling the carburizing section 50 and then filling the cooling section 60. When gas is directly discharged into the atmosphere, there is a danger of explosion due to hydrogen gas, so the burner unit 110 burns the gas and discharges the gas to the atmosphere. That is, the gas carburized in the carburizing portion 50 and the excess carburizing gas are moved to the cooling portion 60 over time, and the gas discharged from the cooling portion 60 flows into the burner portion 110 And then discharged into the atmosphere.

The control unit 100 controls the first control valve 29 of the first supply unit 20 and the second control valve 36 of the second supply unit 30 and the second control valve 36 of the third supply unit 40. [ 3 regulating valve 46 to regulate the amount of gas supplied to the carburizing section 50.

At this time, the gas composition ratio inside the carburizing portion 50 can be measured through the gas analyzer 80. The controller 100 controls the first control valve 29 and the second control valve 29 based on the measured value of the gas analyzer 80 The operations of the second control valve 36 and the third control valve 46 are adjusted again. A larger amount of gas is supplied to the inside of the carburizing portion 50 than the amount of gas required for carburizing.

When the operation of supplying the set gas to the carburizing section 50 is completed, the carburizing section 50 is heated and the carburizing operation of the heat treatment product 120 supplied to the inside of the carburizing section 50 is performed. The gas supplied to the carburizing section 50 moves to the cooling section 60 through the connection hole 56 of the partition member 55. [

The gas that has been transferred to the cooling unit 60 is transferred to the burner unit 110 through the gas recovery unit 70 and then burned and re-supplied to the carburizing unit 50. The gas from the cooling section 60 passes through the inner filter 73 of the first filter section 72 and the hydrogen gas is discharged to the outside of the inner filter 73. Since the hydrogen gas is discharged to the outside of the outer filter 74 again through the outer filter 74 outside the inner filter 73, only the hydrogen gas among the gas passing through the first filter portion 72 passes through the outer filter 74 74, respectively.

The gas that has passed through the first filter unit 72 passes through the second filter unit 76 and is filtered by the nitrogen gas and the nitrogen gas collected by the second filter unit 76 passes through the burner unit 110 It is burned through. The gas from which the nitrogen gas and the hydrogen gas have been removed is again supplied to the carburizing section 50 again.

And analyzing the gas components of the carburizing portion 50, the cooling portion 60, and the gas recovery portion 70 in the gas analysis portion 80 (S20).

After completion of the carburizing operation of the carburizing portion 50, the type and relative amount of the carburizing gas in the carburizing portion 50 are checked through the gas analyzer 80. Then, the gas component flowing into the cooling section 60 through the carburizing section 50 is also measured through the gas analyzing section 80.

The residual gas components in the carburizing section 50 and the residual gas components in the cooling section 60 are analyzed to recycle the carburizing gas and the first filter section 72 of the gas recovering section 70 .

The operation of the gas recovery unit 70 will be described in more detail. Since the control unit 100 opens only the first valve 96 and closes the second valve 98 and the third valve 99, Is transferred to the gas analysis unit 80. [0053] Therefore, the gas analysis unit 80 analyzes the gas component of the carburizing unit 50 and transmits the measured value to the control unit 100. Since only the second valve 98 is opened and the first valve 96 and the third valve 99 are closed, the gas of the cooling unit 60 is moved to the gas analysis unit 80. Therefore, the gas analyzer 80 analyzes the gas component of the cooling unit 60 and transmits the measured value to the controller 100. [ The gas flowing from the gas recovery unit 70 to the carburizing unit 50 is introduced into the gas analysis unit 80 because only the third valve 99 is opened and the first valve 96 and the second valve 98 are closed. . Accordingly, the gas analyzer 80 analyzes the component of the gas re-supplied to the carburizing unit 50 and transmits the measured value to the controller 100.

And a step (S30) of judging whether additional supply of gas to the carburizing section (50) is necessary in the control section (100) receiving the measured value of the gas analyzing section (80).

If the carburizing unit 50 requires additional supply of gas, the control unit 100 operates the gas supply unit 10 to additionally supply the gas (S40).

The control unit 100 controls the operation of the first control valve 29, the second control valve 36 and the third control valve 46 of the gas supply unit 10 based on the measured value of the gas analysis unit 80 So that the gas composition ratio of the carburizing portion 50 is adjusted so that the gas is supplied to the carburizing portion 50 as much as necessary.

In the gas recovery unit 70, hydrogen and nitrogen are discharged to the atmosphere, and the hydrocarbon system is recovered and supplied to the carburizing unit 50 as a heating chamber. It is possible to adjust the amount of the Rx gas as the modifying gas in accordance with the supply amount of the gas recovered to the carburizing section 50. If the difference in the components in the gas recovering section 70 differs by 5% or more, the second regulating valve 36 And adjust it to the initial gas concentration.

And a step (S50) of judging whether or not the carburizing section 50 has completed the carburizing operation.

When the heat treatment process of the heat treatment product 120 is completed, the controller 100 stops the operation of all the valves and the measurement operation of the gas analysis unit 80.

As described above, according to the present invention, since the gas usable for gas carburization among the gas discharged from the cooling unit 60 through the gas recovery unit 70 is recovered and supplied to the carburizing unit 50, The production cost can be reduced by reducing the amount of gas used.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the invention as defined by the appended claims. will be. Accordingly, the true scope of the present invention should be determined by the following claims.

1: Energy-saving gas carburizing device
10: gas supply part 20: first supply part 22: first gas supply part 24: second gas supply part 26: modified part 28: first connection pipe 29: first control valve
30: second supply part 32: first storage tank 34: second connection line 36: second control valve
40: third supply part 42: second storage tank 44: third connection line 46: third control valve
50: carburizing portion 55: partition wall member 56: connection hole 60: cooling portion
70: gas recovery unit 72: first filter unit 73: inner filter 74: outer filter 76: second filter unit 78: return pipe 79:
The present invention relates to a gas analyzing apparatus and a gas analyzing method that are capable of controlling a gas flow rate of an exhaust gas flowing into a gas purifying apparatus. : To the discharge pipe

Claims (14)

A gas supply unit for supplying a gas used for gas carburization;
A carburizing portion that receives gas through the gas supplying portion and carries out gas carburization by heating the heat treatment product;
A cooling unit communicating with the carburizing unit to move the gas supplied to the carburizing unit and cooling the heat treatment product; And
And a gas recovery unit for discharging gas not used for gas carburization among the gas discharged from the cooling unit and recovering the gas used for gas carburization and supplying the recovered gas to the carburization unit.
The method according to claim 1,
A gas component that is connected to the carburizing portion, the cooling portion, and the gas recovering portion, the component of the gas inside the carburizing portion, the component of the gas inside the cooling portion, and the component of the gas moving through the gas returning portion A gas analyzing unit; And
Further comprising a controller for receiving a measured value of the gas analyzer and controlling an operation of the gas supply unit and the gas recovery unit to adjust gas components inside the carburizing unit.
3. The method of claim 2,
The gas supply unit may include: a first supply unit for supplying denatured gas to the carburizing unit;
A second supply unit for supplying hydrocarbon gas to the carburizing unit; And
And a third supply part for supplying ammonia gas used for nitriding to the carburizing part.
The method of claim 3,
The first supply unit may include a first gas supply unit for supplying propane gas;
A second gas supply unit for supplying air;
A metamorphic unit connected to the first gas supply unit and the second gas supply unit and mixing propane gas and air;
A first connection pipe connecting the modified portion and the carburized portion; And
And a first control valve installed at the first connection pipe for controlling the movement of the fluid.
The method of claim 3,
Wherein the second supply unit comprises: a first storage tank for storing a hydrocarbon-based raw gas;
A second connection pipe connecting the first storage tank and the carburizing section; And
And a second control valve installed in the second connection pipe for controlling the movement of the fluid.
The method of claim 3,
The third supply unit may include a second storage tank in which ammonia gas is stored;
A third connection pipe connecting the second storage tank and the carburizing portion; And
And a third control valve installed in the third connection pipe for controlling the movement of the fluid.
3. The method of claim 2,
The gas recovery unit includes a first filter unit for separating hydrogen gas from the gas discharged from the cooling unit and transferring the hydrogen gas to the burner unit; And
And a second filter unit for separating the nitrogen contained in the gas passing through the first filter unit and transferring the nitrogen to the burner unit.
The method of claim 7,
The first filter unit may include an inner filter formed into a porous film and separating hydrogen gas from the gas discharged from the cooling unit; And
And an outer filter surrounding the inner filter and disposed outside the inner filter to separate hydrogen gas from the gas discharged from the inner filter.
8. The method of claim 7,
Wherein the second filter unit uses a membrane filter.
8. The method of claim 7,
Wherein the gas recovery unit includes: a recovery pipe for supplying gas that has passed through the second filter to the carburizing unit; And
Further comprising: a re-supply valve installed in the return pipe for controlling the flow of the fluid.
3. The method of claim 2,
A first conduit connecting the gas analysis unit and the carburizing unit;
A first valve installed in the first conduit for controlling the flow of the fluid;
A second conduit connecting the gas analysis unit and the cooling unit; And
And a second valve installed in the second conduit for controlling the flow of the fluid.
12. The method of claim 11,
A third conduit connecting the gas analysis unit and the gas recovery unit; And
And a third valve installed in the third conduit for controlling the flow of the fluid.
13. The method of claim 12,
Wherein the control unit controls the operation of the first valve, the second valve, and the third valve to control the flow of the gas to the gas analysis unit.
Supplying gas to the carburizing portion by operation of the gas supplying portion;
Analyzing a gas component of the carburizing portion, the cooling portion, and the gas recovery portion in a gas analysis portion;
Determining whether additional supply of gas to the carburizing unit is necessary in a control unit receiving the measurement value of the gas analyzer unit;
If additional supply of gas to the carburizing section is required, the control section operates the gas supply section to further supply the gas; And
And determining whether or not the carburizing operation is completed in the carburizing section.

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