Kiln

Abstract

The kiln comprises a chamber in which an internal space is heated, a rail extending in one direction to transport a refractory box in which raw materials are contained and installed in the internal space of the chamber, an exhaust duct provided to discharge gas generated as the raw materials are heated from the chamber, a plate coupled to the exhaust duct and blocking the leakage of gas, and a valve plate coupled to the plate and including a valve that selectively communicates the inside and outside of the exhaust duct.

Description

Technology Field

[0001] The present invention relates to a calcination furnace for a negative electrode material for manufacturing a secondary battery. Background Technology

[0002] In the cathode material firing process for secondary battery manufacturing, a Roller Hearth Kiln (RHK), a linear firing furnace capable of multi-product, small-batch production under various operating conditions based on temperature precision and internal gas atmosphere control performance, can be utilized.

[0003] The manufacturing process of active materials using RHK involves placing a refractory sagger containing raw material powder in a kiln, depending on the characteristics of the raw material, 200 from 1200 It can be carried out by firing at a temperature.

[0004] Harmful gases, including tar, may be generated while calcining raw powder. The harmful gases need to be transported through an exhaust duct and discharged outside the kiln after incineration.

[0005] However, as harmful gases including tar solidify and accumulate in the exhaust duct, the pressure inside the exhaust duct rises, and the gas may not be discharged smoothly.

[0006] Therefore, it is required to periodically remove solidified gas (hereinafter referred to as 'solids') within the exhaust duct. Since the firing process must be stopped during the gas removal process, a loss in cathode material production may occur. In addition, it is necessary to prevent fire hazards and worker injury hazards as excessive amounts of high-temperature hazardous gas may be emitted.

[0007] For this reason, a method is required to extend the solidification removal cycle and safely penetrate the exhaust duct. The problem to be solved

[0008] The present invention provides a kiln that is easy to maintain.

[0009] The present invention provides a kiln in which the removal of deposits inside the exhaust duct of the kiln is easy.

[0010] The present invention provides a kiln with an extended cycle for removing solids inside the exhaust duct.

[0011] The present invention provides a kiln capable of preventing excessive emission of harmful gases.

[0012] The present invention provides a kiln capable of preventing safety accidents caused by harmful gases. means of solving the problem

[0013] A kiln according to one embodiment of the present invention comprises a chamber in which an internal space is heated, a rail extending along one direction to transport a refractory box in which raw materials are contained and installed in the internal space of the chamber, an exhaust duct provided to discharge gas generated as the raw materials are heated from the chamber, a plate coupled to the exhaust duct and blocking the leakage of gas, and a valve plate coupled to the plate and including a valve that selectively communicates the inside and outside of the exhaust duct.

[0014] The above valve may be configured to allow an insertion rod to be inserted.

[0015] The above valve can be switched between a first state in which the inside and outside of the exhaust duct are connected and a second state in which the inside and outside of the exhaust duct are blocked, and the insertion rod can be inserted into the valve in the first state to block the leakage of gas from the exhaust duct.

[0016] When the above valve is in the first state, it forms a valve passage having a predetermined diameter, and the insertion rod may have a diameter smaller than or equal to the predetermined diameter so as to be able to move in and out of the valve passage.

[0017] It may further include a burner provided to heat air and a gas incineration device provided on the upper side of the exhaust duct.

[0018] The exhaust duct may include a horizontal section duct having a horizontal flow path extending along the one direction, a chamber section duct communicating the horizontal flow path and the chamber, and an incineration section duct having an incineration flow path communicating the horizontal section duct and the gas incineration device.

[0019] The above horizontal section duct further includes a horizontal access section extending from the horizontal flow path section and protruding from the incineration section duct, and the plate may include a horizontal section plate coupled to one end of the horizontal section duct.

[0020] The above valve may include a horizontal valve coupled to the horizontal plate.

[0021] The above-mentioned incineration duct further includes a vertical access section located below the above-mentioned horizontal duct, and the plate may include a vertical plate coupled to the above-mentioned vertical access section.

[0022] The above valve may include a vertical valve coupled to the above vertical plate. Effects of the invention

[0023] According to the present invention, the kiln can be easily maintained.

[0024] According to the present invention, the removal of gas solidified inside the exhaust duct of a kiln can be facilitated.

[0025] According to the present invention, the cycle of removing solidified gas inside the exhaust duct can be extended.

[0026] According to the present invention, excessive emission of harmful gases can be prevented.

[0027] According to the present invention, safety accidents caused by harmful gases can be prevented. Brief explanation of the drawing

[0028] FIG. 1 is a simplified drawing illustrating a kiln according to one embodiment of the present invention. Figure 2 is a perspective view showing a part of the exhaust duct of the kiln of Figure 1. Figure 3 is an enlarged perspective view of the exhaust duct of Figure 2. Figure 4 is a cross-sectional view showing a cross-section of the exhaust duct of Figure 3. Specific details for implementing the invention

[0029] The embodiments described in this specification and the configurations illustrated in the drawings are merely preferred examples of the disclosed invention, and various modifications that may replace the embodiments and drawings of this specification may exist at the time of filing this application.

[0030] Additionally, the same reference numerals or symbols presented in each drawing of this specification represent parts or components that perform substantially the same function.

[0031] Furthermore, the terms used in this specification are for describing embodiments and are not intended to limit or / or restrict the disclosed invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as "comprising" or "having" are intended to indicate the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and do not preclude the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0032] Additionally, terms including ordinal numbers, such as "first," "second," etc., used herein may be used to describe various components, but said components are not limited by said terms, and said terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component. The term "and / or" includes a combination of a plurality of related described items or any one of a plurality of related described items.

[0033] Meanwhile, terms such as "up-and-down direction," "downward side," and "front-backward direction" used in the following description are defined based on the drawings, and the shape and position of each component are not limited by these terms.

[0034] Hereinafter, embodiments according to the present invention will be described in detail with reference to the attached drawings.

[0035] Furthermore, the calcination furnace of the present invention is described as a calcination furnace for manufacturing negative electrode materials for secondary batteries, but is not limited thereto. The calcination furnace of the present invention may also be applied to a calcination furnace for manufacturing positive electrode materials for secondary batteries.

[0036] FIG. 1 is a simplified drawing illustrating a kiln according to one embodiment of the present invention.

[0037] Referring to FIG. 1, the kiln (1) may include a chamber (10) in which the internal space is heated. The chamber (10) may extend along one direction. In the present invention, for convenience, the chamber (10) is shown as a single space, but the chamber (10) may be structured such that a plurality of chambers are arranged along one direction and each chamber has different conditions, such as temperature, or processes.

[0038] The interior of the chamber (10) may include a rail (20) extending in one direction to transport a refractory box (21) in which the raw material of the cathode material is contained. The refractory box (21) can be transported along one direction while placed on the rail (20).

[0039] The rail (20) may include a plurality of rollers that rotate by a motor. However, it is not limited to a conveying method using rollers, and any configuration capable of conveying the refractory box (21) is sufficient.

[0040] A heater (22, 23) may be installed inside the chamber (10). The heater (22, 23) may include an upper heater (22) provided on the upper side of the rail (20) and a lower heater (23) provided on the lower side of the rail (20).

[0041] The upper heater (22) and the lower heater (23) can raise the temperature inside the chamber (10). The temperature of the chamber (10) is approximately 200 It can be heated to a higher temperature. Although not illustrated, the inlet side chamber (10) into which the raw material is introduced is approximately 200 It may be. The outlet side chamber (10) from which the raw material is discharged is approximately 1200 It could be.

[0042] The raw materials transported inside the chamber (10) may generate harmful gases, including tar. The harmful gases may be volatile organic compounds (VOCs). The harmful gases are produced when the internal temperature is approximately 800 This can occur in a chamber (10) below.

[0043] The kiln (1) may include an exhaust duct (40) for discharging harmful gases generated inside the chamber (10).

[0044] An exhaust duct (40) may be positioned above the chamber (10) to discharge harmful gases generated as the raw material is heated. Before the harmful gases are discharged into the atmosphere, they need to be treated through methods such as incineration or adsorption.

[0045] In this disclosure, hazardous gases are described as being treated by incineration. However, the method for treating hazardous gases may be configured in other ways and is not limited thereto.

[0046] The kiln (1) may include a gas incineration device (50) comprising a burner (51) provided to incinerate harmful gases. The gas incineration device (50) may be located above the exhaust duct (40).

[0047] The exhaust duct (40) can connect the interior of the chamber (10) with the gas incineration device (50). The gas transferred to the exhaust duct (40) can be incinerated in the gas incineration device (50). Harmful gases can be incinerated in the gas incineration device (50) and become capable of being discharged into the atmosphere.

[0048] The gas incineration device (50) can be connected to the outside of the kiln (1). Harmful gas incinerated in the gas incineration device (50) can be discharged to the outside of the kiln (1), that is, into the atmosphere.

[0049] Figure 2 is a perspective view showing a part of the exhaust duct of the kiln of Figure 1.

[0050] Referring to FIG. 2, the furnace (1) may include a plate (60) that is coupled to the exhaust duct (40) to block the leakage of gas. The plate (60) may form a flow path so that the gas inside the exhaust duct (40) flows between the chamber (10) and the gas incineration device (50).

[0051] The exhaust duct (40) may include a horizontal duct (41) extending along one direction. The horizontal duct (41) may extend along the same direction as the chamber (10) and the rail (20) extend.

[0052] The exhaust duct (40) may include a chamber duct (42) that connects the horizontal duct (41) and the chamber (10). The chamber duct (42) may protrude vertically from the chamber (10). The chamber duct (42) may extend upward from the chamber (10). That is, the chamber duct (42) and the horizontal duct (41) may be orthogonal to each other. However, it is not limited thereto, and the chamber duct (42) may connect the chamber (10) and the horizontal duct (41) in a bent shape.

[0053] The exhaust duct (40) may include an incineration duct (43) that connects the horizontal duct (41) and the gas incineration device (50). The incineration duct (43) may be arranged vertically with respect to the horizontal duct (41). That is, the incineration duct (43) and the horizontal duct (41) may be orthogonal to each other.

[0054] The incineration duct (43) may include a vertical access section (431) located below the horizontal duct (41). The vertical access section (431) may be provided to be openable and closable to remove solidified material (D) inside the incineration duct (43).

[0055] The incineration duct (43) may include an incineration flow path (432) located above the horizontal duct (41). The incineration flow path (432) may form a flow path for harmful gas that has traveled through the horizontal duct (41) to head toward the gas incineration device (50).

[0056] The horizontal section duct (41) may be provided to pass through the incineration section duct (43). The horizontal section duct (41) may include a horizontal access section (411) partitioned by the incineration section duct (43) and a horizontal flow section (412).

[0057] The horizontal flow path (412) may be a part that communicates with the chamber duct (42) extending from the chamber (10).

[0058] The horizontal access section (411) may be a portion where the end of the horizontal duct (41) is located. The horizontal access section (411) may be provided to be openable and closable to remove a deposit (D) inside the horizontal duct (41).

[0059] The user can remove the accumulated solids (D) inside the horizontal duct (41) and the incineration duct (43) through the horizontal access section (411) and the vertical access section (431).

[0060] FIG. 3 is an enlarged perspective view of the exhaust duct of FIG. 2. FIG. 4 is a cross-sectional view of the exhaust duct of FIG. 3.

[0061] Referring to FIGS. 3 and FIGS. 4, a device for removing a deposit (D) inside an exhaust duct (40) will be described.

[0062] The exhaust duct (40) can block the leakage of gas by means of a plate (60). That is, the plate (60) can form a flow path so that the gas flowing inside the exhaust duct (40) is discharged from the chamber (10) and directed toward the gas incineration device (50).

[0063] The plate (60) may include a horizontal plate (61) coupled to the horizontal duct (41) and a vertical plate (62) coupled to the incineration duct (43). Specifically, the horizontal plate (61) may be coupled to the horizontal access portion (411) of the horizontal duct (41), and the vertical plate (62) may be coupled to the vertical access portion (431) of the incineration duct (43).

[0064] A horizontal plate (61) may be attached to the end of the horizontal duct (41). Although not illustrated, a horizontal plate (61) may also be attached to the other end (not illustrated) of the horizontal duct (41). Specifically, the horizontal access portion (411) of the horizontal duct (41) may be configured to be openable and closable by the horizontal plate (61).

[0065] The horizontal plate (61) can close the horizontal access section (411) to prevent gas flowing inside the horizontal access section (411) from being released to the outside. Additionally, the horizontal plate (61) can open the horizontal access section (411) to remove solidified material (D) inside the exhaust duct (40), including the horizontal duct (41).

[0066] Likewise, the vertical access section (431) of the incineration duct (43) can be configured to be openable and closable by a vertical plate (62). The vertical plate (62) can close the vertical access section (431) to prevent gas flowing inside the vertical access section (431) from leaking out. Additionally, the vertical plate (62) can open the vertical access section (431) to remove internal deposits (D) of the exhaust duct (40).

[0067] However, if excessive harmful gas is emitted from the horizontal access section (411) and the vertical access section (431), safety and environmental problems may occur, so it is necessary to improve this.

[0068] The furnace (1) may include a plate (60) that is coupled to the exhaust duct (40) and blocks the outflow of gas, and a valve plate (80) that is coupled to the plate (60) and includes a valve (70) that selectively communicates the inside and outside of the exhaust duct (40).

[0069] The horizontal plate (61) can be detachably coupled to the horizontal access section (411). To this end, a flange-shaped coupling section may be provided at the end of the horizontal access section (411).

[0070] Likewise, the vertical plate (62) can be detachably coupled to the vertical access part (431). To this end, a flange-shaped coupling part may be provided at the end of the vertical access part (431).

[0071] The connection between the horizontal plate (61) and the horizontal access part (411), and between the vertical plate (62) and the vertical access part (431), can be made by a bolt and nut connection method along the perimeter of the horizontal plate (61) and the vertical plate (62). However, the connection method of the present invention is not limited thereto.

[0072] The valve (70) can selectively connect the inside and outside of the exhaust duct (40). The valve (70) can be switched between a first state in which the inside and outside of the exhaust duct (40) are connected and a second state in which the inside and outside of the exhaust duct (40) are blocked.

[0073] The valve (70) may be a ball valve. However, it is not limited to this and may be provided as a valve of various types.

[0074] The valve plate (80) may include a horizontal valve plate (81) coupled to the horizontal access section (411) and a vertical valve plate (82) coupled to the vertical access section (431).

[0075] The horizontal valve plate (81) may include a horizontal plate (61) coupled to the horizontal access part (411).

[0076] The horizontal valve plate (81) may include a horizontal valve (71) that is coupled to the horizontal plate (61) and selectively connects the inside and outside of the horizontal access section (411).

[0077] The vertical valve plate (82) is coupled to the vertical plate (62) and may include a vertical valve (72) that selectively communicates the inside and outside of the vertical access section (431).

[0078] In the drawings of the present invention, the horizontal valve plate (81) and the vertical valve plate (82) are each shown to include a horizontal valve (71) and a vertical valve (72), respectively, and one valve (70) per plate, but the number of valves per plate may be multiple.

[0079] Additionally, although not illustrated, the horizontal access section (411) may be configured to include only a horizontal plate (61) without a horizontal valve (71), and the vertical access section (431) may include both a vertical plate (62) and a vertical valve (72).

[0080] Conversely, the vertical access section (431) may be configured to include only a vertical plate (62) without a vertical valve (72), and the horizontal access section (411) may include both a horizontal plate (61) and a horizontal valve (71).

[0081] If a deposit (D) accumulates inside the exhaust duct (40) and obstructs the flow of gas, the pressure inside the exhaust duct (40) may increase. As a result, the exhaust duct (40) may be damaged or a fire may occur. Additionally, during the work to prevent this, there may be a problem where a worker is injured due to high temperature or high pressure gas.

[0082] To solve these problems, an insertion rod (100) having a rod shape can be inserted into a horizontal valve (71) or a vertical valve (72) to clean the inside of the exhaust duct (40).

[0083] The insertion rod (100) may have a pointed end to improve the efficiency of cleaning the inside of the exhaust duct (40). After the insertion rod (100) is inserted into the inside of the horizontal valve (71) or the vertical valve (72), the thickness of the insertion rod (100) may be smaller than the diameter inside the valve (71, 72) in order to efficiently clean or remove the internal deposits (D).

[0084] When the valve (71, 72) is in the first state, the user can insert an insertion rod (100) to remove the deposit (D) inside the exhaust duct (40). However, as an example of removing the deposit (D) inside the exhaust duct (40), a rod-shaped insertion rod (100) is used, and an air gun or cleaning agent capable of inserting air can be used to remove the deposit (D) inside.

[0085] By using the insertion rod (100) through the horizontal valve (71), the deposit (D) inside the exhaust duct (40) can be repositioned, or a portion of the deposit (D) can be discharged to the outside of the exhaust duct (40).

[0086] Likewise, the deposit (D) inside the exhaust duct (40) can be repositioned or a portion of the deposit (D) can be discharged outside the exhaust duct (40) by using the insertion rod (100) through the vertical valve (72).

[0087] Specifically, the operator can clean the inside of the exhaust duct (40) by applying external force to the deposit (D) by reciprocating or rotating the insertion rod (100) inserted into the valve (71, 72).

[0088] When cleaning the vertical valve (72) in the first state using the insertion rod (100), the opening of the vertical valve (72) is facing the ground, so it may be easy to discharge the deposit (D) due to the influence of gravity.

[0089] By relocating or discharging the fixed material (D) to the outside, a flow path can be secured so that gas can pass smoothly inside the exhaust duct (40). By securing the flow path, the pressure inside the exhaust duct (40) can be reduced, the risk of fire can be reduced, and damage to the fireproof casing (21) can be prevented.

[0090] The effects obtainable from the present invention are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art to which the present invention belongs from the description below.

[0091] Specific embodiments have been illustrated and described above. However, the invention is not limited to the embodiments described above, and those skilled in the art may make various modifications without departing from the essence of the technical concept of the invention as described in the following claims. Explanation of the symbols

[0092] 1: Kiln 10: Chamber 20: Rail 21: Firearm 22: Upper heater 23: Bottom heater 40: Exhaust duct 41: Horizontal exhaust duct 411: Horizontal access section 412: Horizontal Euro section 42: Chamber section duct 43: Incineration duct 431: Vertical access section 432: Incineration Eurobu 50: Gas incinerator 51: Burner 60: Plate 61: Horizontal plate 62: Vertical plate 70: Valve 71: Horizontal valve 72: Vertical valve 80: Valve plate 81: Horizontal valve plate 82: Vertical valve plate 100: Insert Load D: Fixation

Claims

Claim 1 A furnace comprising: a chamber in which an internal space is heated; a rail extending along one direction to transport a refractory box containing raw materials installed in the internal space of the chamber; an exhaust duct arranged to discharge gas generated as the raw materials are heated from the chamber; a valve plate including a plate coupled to the exhaust duct and blocking the leakage of gas, and a valve coupled to the plate and selectively communicating the inside and outside of the exhaust duct; wherein the exhaust duct includes a horizontal section duct including a horizontal flow path extending along one direction and a vertical access section located below the horizontal section duct; the plate includes a vertical section plate coupled to the vertical access section; the valve includes a vertical section valve coupled to the vertical section plate and opening toward the ground to discharge solidified material in the direction of gravity; and the vertical section valve is arranged to allow an insertion rod to be inserted so as to enable the redistribution or discharge of solidified material within the exhaust duct. Claim 2 delete Claim 3 A kiln according to claim 1, wherein the valve is switchable between a first state in which the inside and outside of the exhaust duct are connected and a second state in which the inside and outside of the exhaust duct are blocked, and the insertion rod is inserted into the valve in the first state to block the leakage of gas from the exhaust duct. Claim 4 In paragraph 3, the valve forms a valve passage having a predetermined diameter when in the first state, and the insertion rod has a diameter smaller than or equal to the predetermined diameter so as to be able to move in and out of the valve passage. Claim 5 A kiln according to claim 1, further comprising a gas incineration device provided on the upper side of the exhaust duct, and a burner provided to heat air. Claim 6 In claim 5, the exhaust duct comprises a chamber duct that communicates the horizontal flow path and the chamber, and an incineration duct that communicates the horizontal duct and the gas incineration device. Claim 7 In claim 6, the horizontal section duct further includes a horizontal access section extending from the horizontal flow section and protruding from the incineration section duct, and the plate includes a horizontal section plate coupled to one end of the horizontal section duct. Claim 8 In claim 7, the above valve is a firing furnace comprising a horizontal valve coupled to the horizontal plate. Claim 9 delete Claim 10 delete

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