Batch-type annealing furnace

Abstract

A batch-type annealing furnace is disclosed. A batch-type annealing furnace according to an embodiment may include: an annealing chamber for accommodating a material coil; a combustion chamber provided with a burner for ejecting flames and partitioned to be able to ventilate with the annealing chamber; a blowing fan for providing a blowing force so that a fluid in the combustion chamber is blown to the annealing chamber; a duct for guiding the flow of the fluid blown from the combustion chamber to the annealing chamber; and a nozzle connected to the duct so as to spray, to the coil, the fluid guided to the annealing chamber through the duct.

Description

Batch type annealing furnace

[0001] The present disclosure relates to a batch type annealing furnace.

[0002] In the steelmaking process, coils manufactured by rolling are annealed to remove work hardening.

[0003] Among the annealing furnaces for annealing treatment, there are continuous annealing furnaces that continuously perform heat treatment by unwinding the coil, and batch-type annealing furnaces that perform heat treatment while the coil is wound.

[0004] In the case of batch type annealing furnaces, heat treatment of coils is possible even in narrow spaces, so equipment investment costs are low, and the range of materials used is wide, so it is easy to expand the use, etc.

[0005] Among batch-type annealing furnaces, some directly heat the coil using a burner installed inside the annealing chamber. The burner generates a flame at temperatures exceeding 1800°C, and the coil in the annealing chamber is heated by radiant heat from the flame.

[0006] However, in a heating method where the coil is heated while directly exposed to the flame, there is a high risk that the outer side of the coil adjacent to the flame may be overheated, resulting in over-annealing or rupture.

[0007] Also, since the coil is heated to different temperatures in different parts depending on the distance from the flame, it may be difficult to achieve uniform annealing treatment throughout.

[0008] One aspect of the present disclosure provides a batch type annealing furnace capable of uniformly annealing a coil without concern of local over-annealing or rupture.

[0009] One aspect of the present disclosure provides a batch-type annealing furnace capable of reducing the amount of rust generated during annealing treatment of a coil.

[0010] A batch type annealing furnace according to the invention may include: an annealing chamber for accommodating a material coil; a combustion chamber having a burner for emitting a flame and being ventilatedly partitioned from the annealing chamber; a blower fan for providing a blowing force so that a fluid in the combustion chamber is blown into the annealing chamber; a duct for guiding the flow of a fluid blown from the combustion chamber to the annealing chamber; and a nozzle connected to the duct for spraying a fluid guided to the annealing chamber through the duct onto the coil.

[0011] The annealing chamber may accommodate a plurality of coils, and the nozzles may be configured in plurality to individually inject fluid to each coil.

[0012] The above nozzle can spray fluid into the hollow space at the center of the coil.

[0013] The above nozzle is provided as a single-hole type having one injection hole, and the center of the injection hole can be aligned with the center of the hollow portion.

[0014] The above nozzle is provided as a multi-porous type having a plurality of injection holes, and the plurality of injection holes may include a first injection hole whose center is aligned with the center of the hollow portion, and a plurality of second injection holes arranged around the first injection hole.

[0015] The above first injection hole may have a larger diameter than the above second injection hole.

[0016] The above nozzle is provided as a multi-porous type having a plurality of injection holes, and the plurality of injection holes may each have the same diameter.

[0017] The above plurality of injection holes may be positioned on the same plane and arranged at equal intervals from each other.

[0018] The annealing chamber accommodates a plurality of coils, and a plurality of nozzles are assigned to each coil, and the plurality of nozzles assigned to each coil can spray fluid to different parts of each coil.

[0019] The annealing chamber may further include an exhaust passage connected thereto, which is opened and closed by a first opening and closing means, for discharging internal fluid, and an outside air introduction passage connected thereto, which is opened and closed by a second opening and closing means, for introducing outside air. The duct includes a main passage extending from the combustion chamber and a connecting passage connecting the main passage and a nozzle, the blower fan being installed on the main passage and a bypass passage connecting two points of the main passage to bypass the point upstream of the point where the blower fan is installed; a passage switching valve provided at an intersection between the main passage and the bypass passage so that a fluid flowing in the direction of the nozzle passes through one of the bypass passage and the main passage between both ends of the bypass passage; and a cooler for cooling the bypass passage.

[0020] The space between the combustion chamber and the annealing chamber is ventilated through a partition wall having a ventilation hole, and the partition wall may be provided with a flame blocking member that blocks the flame of the combustion chamber from flowing into the annealing chamber through the ventilation hole.

[0021] The space between the combustion chamber and the annealing chamber is partitioned in a ventilated state through a partition wall having a ventilation hole, and the burner body can be installed such that the direction of the flame ejection avoids the direction of the partition wall.

[0022] The space between the combustion chamber and the annealing chamber is partitioned in a ventilated state through a partition wall having a ventilation hole, the burner has an outlet for emitting a flame, and the outlet can be provided in the burner so that the direction of the flame emission avoids the direction of the partition wall.

[0023] The above burner is composed of a plurality of burners, and at least one of the plurality of burners may have a different capacity from the rest.

[0024] According to the present disclosure, a batch-type annealing furnace capable of uniformly annealing a coil without worrying about local over-annealing or rupture can be provided.

[0025] According to the present disclosure, a batch-type annealing furnace capable of reducing the amount of rust generated by annealing a coil can be provided.

[0026] Figures 1 to 3 are perspective views of a batch type annealing furnace according to one embodiment, showing the structure of the batch type annealing furnace viewed from various directions.

[0027] Figures 4 and 5 are perspective views of a batch type annealing furnace according to one embodiment, showing the inside of the annealing chamber.

[0028] Figure 6 illustrates a batch type annealing furnace according to one embodiment, showing a state in which a heating process is being performed.

[0029] Figure 7 illustrates a batch type annealing furnace according to one embodiment, showing a state in which a cooling process is being performed.

[0030] Fig. 8 is an enlarged front view of a nozzle and coil in a batch type annealing furnace according to one embodiment. Fig. 9 is a side view of Fig. 8, and Fig. 10 is a modified example.

[0031] Figures 11 to 13 illustrate other modified examples of nozzles in a batch type annealing furnace according to one embodiment.

[0032] Figure 14 illustrates a modified example of a batch type annealing furnace according to one embodiment.

[0033] Fig. 15 is a schematic diagram showing another modified example of a batch type annealing furnace according to one embodiment.

[0034] Figure 16 is a schematic diagram showing another modified example of a batch type annealing furnace according to one embodiment.

[0035] Throughout the specification, the same reference numerals denote the same components. This specification does not describe all elements of the embodiments, and any content that is general in the technical field to which the present invention pertains or that overlaps between the embodiments is omitted. The terms 'part, module, element, block' used in the specification may be implemented in software or hardware, and depending on the embodiments, multiple 'parts, modules, elements, blocks' may be implemented as a single component, or a single 'part, module, element, block' may include multiple components.

[0036] Throughout the specification, when a part is said to be "connected" to another part, this includes not only direct connection but also indirect connection, and indirect connection includes connection via a wireless communication network.

[0037] Additionally, when a part is said to "include" a component, this does not mean that it excludes other components, but rather that it may include other components, unless otherwise specifically stated.

[0038] Throughout the specification, when it is said that an element is "on" another element, this includes not only cases where the element is in contact with the other element, but also cases where another element exists between the two elements.

[0039] The terms first, second, etc. are used to distinguish one component from another, and the components are not limited by the aforementioned terms.

[0040] Singular expressions include plural expressions unless the context clearly indicates otherwise.

[0041] The identification codes in each step are used for convenience of explanation and do not describe the order of each step, and each step may be performed in a different order than specified unless the context clearly indicates a specific order.

[0042] The term “and / or” may include any combination of multiple related described elements or any one of multiple related described elements.

[0043] The operating principle and embodiments of the present invention will be described with reference to the attached drawings below.

[0044] For reference, FIGS. 1 to 3 are perspective views of a batch-type annealing furnace according to one embodiment, showing the structure of the batch-type annealing furnace viewed from various directions. FIGS. 4 and 5 are perspective views of a batch-type annealing furnace according to one embodiment, showing the inside of the annealing chamber. FIG. 6 illustrates a batch-type annealing furnace according to one embodiment, showing a state in which a heating process is being performed. FIG. 7 illustrates a batch-type annealing furnace according to one embodiment, showing a state in which a cooling process is being performed.

[0045] As illustrated in FIGS. 1 to 7, a batch type annealing furnace (1) according to one embodiment may include an annealing chamber (10), a combustion chamber (20) that is ventilated from the annealing chamber (10), a blower fan (30) that provides blowing force so that the fluid in the combustion chamber (20) is blown into the annealing chamber (10), a duct (40) that guides the flow of the fluid blown from the combustion chamber (20) to the annealing chamber (10), and a nozzle (50) that sprays the fluid guided to the annealing chamber (10) through the duct (40) onto the coil (2).

[0046] The annealing chamber (10) can accommodate a material coil (2) to be annealed. The batch-type annealing furnace (1) has a furnace body (1a) and can be provided through a space on one side inside the furnace body (1a) of the annealing chamber (10). The coil (2) can be accommodated in the annealing chamber (10) so as to be supported by a support member (3) installed on the floor of the annealing chamber (10). A plurality of coils (2) can be arranged in the longitudinal direction of the annealing chamber (10). The plurality of coils (2) can be accommodated in the annealing chamber (10) so as to form a multi-stage structure in which some are supported by the support member (3) and other parts are stacked on top between the coils (2) supported by the support member (3).

[0047] An exhaust passage (61) for discharging the fluid inside the annealing chamber (10) is connected to one side of the annealing chamber (10), and the exhaust passage (61) can be opened and closed by an opening and closing means (62). The opening and closing means (62) can be a first opening and closing means.

[0048] A combustion chamber (20) may be equipped with a burner (21) that emits a flame. The combustion chamber (20) may be provided through a space on the other side of the inside of the furnace body (1a). The burner (21) may be configured in multiple numbers, and air and fuel as oxidizers may be supplied together to each burner (21). When the ignition device is operated, a flame may be emitted into the combustion chamber (20) through the burner (21).

[0049] Inside the body (1a), a partition wall (60) having a ventilation hole (61) may be provided to allow ventilation between the combustion chamber (20) and the annealing chamber (10).

[0050] A duct (40) may be provided to guide the fluid in the combustion chamber (20) to the annealing chamber (10). The duct (40) may be provided to connect the combustion chamber (20) and the annealing chamber (10) from the outside of the combustion chamber (20) and the annealing chamber (10).

[0051] The duct (40) may include a main passage (41) extending from the combustion chamber (20) and a connecting passage (42) connecting the main passage (41) and the nozzle (50). The main passage (41) may be connected to the combustion chamber (20) through the bottom surface of the combustion chamber (20).

[0052] A blower fan (30) can be installed in a duct (40) to perform a blowing function so that the fluid in the combustion chamber (20) is guided to the annealing chamber (10) along the duct (40). The blower fan (30) can be installed on the main flow path (41) of the duct (40). The blower fan (30) can be configured as a single or multiple blowers depending on the shape or branching structure of the duct (40).

[0053] An outside air introduction path (71) for introducing outside air is connected to the duct (40), and the outside air introduction path (71) can be opened and closed by an opening and closing means (72). The opening and closing means (72) can be a second opening and closing means.

[0054] The nozzle (50) is installed at the end of the connecting passage (42) and is installed to spray fluid into the annealing chamber (10), so that the fluid guided to the annealing chamber (10) through the connecting passage (42) can be sprayed onto the coil (2).

[0055] The batch type annealing furnace (1) configured in this manner can directly inject high-temperature combustion heat formed in the combustion chamber (20) by the flame emitted from the burner (21) onto the coil (2) through the nozzle (50).

[0056] Therefore, according to the batch type annealing furnace (1) according to the present embodiment, by preventing the coil (2) from being exposed to the flame of the burner (21) during the heating process of the annealing treatment, it is possible to prevent the coil (2) from being locally over-annealed or ruptured by the flame.

[0057] Also, at this time, the high temperature combustion heat formed in the combustion chamber (20) through the flame is directly sprayed onto the coil (2) through the duct (40) and nozzle (50), thereby utilizing the convection phenomenon of the combustion heat so that the coil (2) can be uniformly annealed throughout.

[0058] The nozzles (50) are configured in multiple numbers to individually inject fluid into each coil (2) placed in the annealing chamber (10), thereby increasing the heating efficiency of the coil (2) by combustion heat.

[0059] For example, the nozzle (50) may be configured with a number corresponding to the number of coils (2) so that combustion heat is individually sprayed to each coil (2).

[0060] In addition, as illustrated in the drawing, a plurality of nozzles (50) may be assigned to each coil (2). The plurality of nozzles (50) assigned to each coil (2) may spray fluid to different parts of each coil (2), thereby allowing various parts of the coil (2) to be heated more evenly by the combustion heat sprayed through the nozzles (50). For example, some of the nozzles (50) may be arranged in the annealing chamber (10) at a position corresponding to one end of the coil (2) so as to spray fluid toward one end of the coil (2), and the remaining nozzles (50) may be arranged in the annealing chamber (10) at a position corresponding to the other end of the coil (2) so as to spray fluid toward the other end of the coil (2).

[0061] The connecting passage (42) of the duct (40) may include a plurality of first connecting passages (42a) branching from the main passage, and a second connecting passage (42b) branching from each of the first connecting passages (42a) and connected to the nozzle (50). For example, the first connecting passages (42a) may be configured as a pair.

[0062] In addition, each nozzle (50) may be configured to inject fluid into the hollow portion (2a) at the center of the coil (2). The fluid injected into the hollow portion (2a) of the coil (2) by the nozzle (50) can ensure linear flow. This can contribute to ensuring an overall circulation flow of combustion heat supplied from the combustion chamber (20) to the annealing chamber (10) through the duct (40) and then flowing back into the combustion chamber (20).

[0063] As illustrated in FIGS. 8 and 9, the nozzle (50) may be provided as a single-hole type having one injection hole (51) and the center of the injection hole (51) aligned with the center of the hollow portion (2a) of the coil (2). Such a nozzle (50) has a simplified structure by having one injection hole (51), while enabling the fluid to be accurately injected toward the center of the hollow portion (2a) by the injection hole (51). The fluid injected toward the center of the hollow portion (2a) gradually expands and can evenly contact the hollow portion (2a) of the coil (2) and its periphery as a whole.

[0064] The injection hole (51) may be designed so that its diameter gradually decreases in the direction of the fluid injection so that the straightness of the injected fluid can be further increased. In addition, as illustrated in Fig. 10, the injection hole (51) may be designed so that its diameter gradually increases in the direction of the fluid injection so that the expandability of the injected fluid can be further increased.

[0065] Examples of modifications of the nozzle (50) are shown in FIGS. 11 to 13.

[0066] As illustrated in Fig. 11, the nozzle (50a) may be provided as a multi-porous type having a plurality of injection holes (51a, 52a). In this nozzle (50a), the injection holes (51a, 52a) may include a central first injection hole (51a) whose center coincides with the center of the hollow portion (2a) of the coil (2), and a plurality of second injection holes (52a) arranged around the first injection hole (51a). The central first injection hole (51a) may serve to improve the straightness of the fluid injection, and the second injection holes (52a) arranged around the first injection hole (51a) may serve to increase the expandability of the fluid injection.

[0067] Considering that the first injection hole (51a) is configured as one, the first injection hole (51a) may be provided to have a relatively larger diameter than the second injection holes (52a) provided in multiples so that the straightness and expandability of the injection fluid can be evenly increased.

[0068] As illustrated in FIGS. 12 and 13, the nozzles (50b, 50c) are provided as a multi-porous type having a plurality of injection holes (51b, 51c), and the plurality of injection holes (51b, 51c) may be provided to have the same diameter, respectively. In addition, the nozzle (50c) may be arranged such that the plurality of injection holes (51c) are arranged on the same plane and are spaced equally from each other. Such nozzles (50b, 50c) can easily increase the injection area for injecting fluid, and thus, even when arranged to inject fluid between coils (2), the fluid can be smoothly supplied to each coil (2).

[0069] The annealing process of a coil (2) using a batch type annealing furnace (1) according to one embodiment is described as follows.

[0070] The coil (2) can be annealed by sequentially going through a heating process, a soaking process, and a cooling process.

[0071] Referring again to FIG. 6, in the heating process, the burner (21) is operated so that a flame is generated in the combustion chamber (20), and the blower fan (30) can be operated while the exhaust passage (61) and the outside air introduction passage (71) are closed using the first opening / closing means (62) and the second opening / closing means (72).

[0072] Accordingly, the combustion heat formed in the combustion chamber (20) through the flame can be guided to the annealing chamber (10) through the duct (40) and sprayed to each coil (2) through the nozzle (50) to heat the coil (2). The heat that has heated the coil (2) flows back into the combustion chamber (20) through the ventilation hole (61) formed in the partition wall (60), and the heat that has flowed into the combustion chamber (20) can be guided back to the duct (40) together with the heat generated through the flame. This circulation flow of heat can be continuously performed until the coil (2) reaches the target annealing temperature. For example, the annealing temperature can be approximately 650 to 850°C.

[0073] Therefore, the coil (2) can be uniformly annealed overall by the high temperature heat formed in the combustion chamber (20) without any concern of being locally over-annealed or ruptured by the flame of the combustion chamber (20).

[0074] Also, at this time, the coil (2) can be sufficiently heated even when the flame temperature is lowered by the circulation structure of the combustion heat circulating through the combustion chamber (20) and the annealing chamber (10), so that the amount of NOx generated by the flame can be reduced. A low NOx burner can be used as the burner (21).

[0075] After the heating process, a cracking process is performed to crack the internal structure of the coil (2) by maintaining the annealing temperature for a certain period of time, and after the cracking process, a cooling process can be performed to cool the cracked coil.

[0076] In order to further reduce the amount of NOx generated, multiple burners (21) may be provided in the combustion chamber (20) so that the burners (21) for use in the heating process and the cracking process have different capacities. If burners (21) of different capacities are used separately in the heating process and the cracking process, the load ratio of the burners (21) can be easily controlled, thus stabilizing the burner control, and thus further increasing the NOx reduction rate by the burners (21).

[0077] Referring back to FIG. 7, in the cooling process, the operation of the burner (21) can be stopped, and the exhaust path (61) and the outside air introduction path (71) can be opened by the first opening / closing means (62) and the second opening / closing means (72). In this state, the blower fan (30) continuously circulates the outside air introduced through the outside air introduction path (71) along the same path as in the heating process, while continuously exhausting the high temperature heat inside the annealing chamber (10), thereby cooling the coil (2) to room temperature. Accordingly, the annealing treatment of the coil (2) can be completed.

[0078] Fig. 14 shows a modified example of a batch type annealing furnace (1) according to one embodiment.

[0079] As shown in Fig. 14, the batch type annealing furnace (1) is designed to increase the efficiency of the cooling process and may further include a bypass path (81) and a path switching valve (82, 83) installed in the duct (40) and a cooler (84).

[0080] The bypass path (81) can be connected to bypass between two points of the main path (41) upstream of the point where the blower fan (50) is installed.

[0081] The euro switching valve (82, 83) may be provided at the intersection between the main passage (41) and the bypass passage (81) so that the fluid flowing in the direction of the nozzle (50) passes through either the bypass passage (81) or the main passage (41) between the ends of the bypass passage (81).

[0082] And the cooler (84) may be provided to cool the bypass passage (81). The cooler (84) may be installed in contact with or close to the bypass passage (81) to cool the fluid passing through the bypass passage (81). A water-cooled cooler may be used as the cooler (84).

[0083] The cooling process of the annealing treatment can be divided into a primary cooling process and a secondary cooling process. In the case of general steel, surface oxidation of the coil (2) does not occur at a temperature of approximately 200°C or lower. Taking this into account, in the primary cooling process, the temperature of the coil (2) can be cooled to approximately 200°C while the exhaust passage (61) and the external air introduction passage (71) are closed so that contact between the coil (2) and oxygen is blocked to prevent oxidation of the coil (2). For reference, the temperature at which surface oxidation is not induced may vary depending on the steel type. For example, in the case of stainless steel, the temperature at which surface oxidation is not induced may be approximately 750°C.

[0084] At this time, the flow switching valve (82, 83) is switched so that the combustion heat guided from the combustion chamber (20) to the duct (40) passes through the bypass passage (81), and the cooler (84) can be driven to cool the fluid passing through the bypass passage (81). In Fig. 14, the dotted arrow indicates the flow of heat passing through the bypass passage (81) at this time, and the solid arrow indicates the flow of heat passing through the duct (40) in the heating process. Therefore, in the first cooling process, the heat inside the annealing furnace (1) is cooled by the cooler (84) in the process of circulating so as to pass through the bypass passage (81), and the coil (2) can be cooled through the fluid cooled by this cooler (84).

[0085] This cooling action can be performed at least at the beginning of the primary cooling process, thereby contributing to shortening the overall cooling process time.

[0086] In the secondary cooling process, there is no concern that the coil (2) will be oxidized by the outside air, so the outside air introduction path (71) and the exhaust path (72) can be opened to allow the outside air to be introduced. Accordingly, the coil (2) can be quickly cooled to room temperature by the outside air introduced into the annealing furnace (1) by the action of the blower fan (30) and the cooling action of the cooler (84).

[0087] Therefore, according to the batch type annealing furnace (1) according to one embodiment, it is possible to prevent the coil (2) from being heated directly by the flame while preventing the overall heat treatment process speed from being reduced.

[0088] Fig. 15 illustrates another modified example of a batch type annealing furnace (1) according to one embodiment.

[0089] As illustrated in Fig. 15, a partition wall (60) that divides the annealing chamber (10) and the combustion chamber (20) may be provided with a flame blocking member (90) that blocks the flame of the combustion chamber (20) from flowing into the annealing chamber (10) through the ventilation hole (61).

[0090] A flame blocking member (90) may be installed in each of a plurality of ventilation holes (61). The flame blocking member (90) may include a fixing member (91) fixed to the bulkhead (60), and a cover member (92) formed to extend from the fixing member (91) so as to cover the ventilation holes (61) in a spaced state. The fixing member (91) is fixed to one surface of the bulkhead (60) around the ventilation holes (61) facing the combustion chamber (20), and the cover member (92) is bent and extended from an end of the fixing member (91) toward the combustion chamber (20) so as to cover the ventilation holes (61) in a spaced state, thereby allowing ventilation by the ventilation holes (61) while blocking the flame from penetrating into the annealing chamber (10) through the ventilation holes (61).

[0091] Therefore, the batch type annealing furnace (1) equipped with a flame blocking member (90) can more reliably prevent the coil (2) from being damaged by the flame by fundamentally blocking the flame formed in the combustion chamber (20) from penetrating into the annealing chamber (10) through the partition wall (60).

[0092] Fig. 16 illustrates another modified example of a batch type annealing furnace (1) according to one embodiment.

[0093] As shown in Fig. 16, the burner (21) installed in the combustion chamber (20) can be arranged so that the direction of flame ejection avoids the direction of the bulkhead (60).

[0094] To this end, the burner (21) may be installed in the combustion chamber (20) so that the direction of flame ejection of the body (21a) avoids the direction of the bulkhead, or the ejection port (21b) provided at the tip of the body (21a) to eject flame may be provided so that the direction of flame ejection avoids the direction of the bulkhead (60).

[0095] The annealing furnace (1) configured in this manner can prevent flames formed in the combustion chamber (20) from penetrating into the annealing chamber (10) through the bulkhead (60) even without adding a separate component such as a flame blocking member (90).

Claims

1. Annealing chamber for accommodating the material coil; A combustion chamber equipped with a burner that emits flame and separated from the annealing chamber in a ventilated state; A blower fan that provides blowing force so that the fluid in the combustion chamber is blown into the annealing chamber; A duct that guides the flow of fluid sent from the combustion chamber to the annealing chamber; A batch type annealing furnace including a nozzle connected to the duct to spray a fluid guided to the annealing chamber through the duct onto the coil.

2. In paragraph 1, A plurality of coils are accommodated in the above annealing chamber, The above nozzles are configured in multiple batch type annealing units to individually inject fluid to each coil.

3. In paragraph 1, The above nozzle is a batch type annealing furnace that injects fluid into the hollow space in the center of the coil.

4. In paragraph 3, The above nozzle is provided as a single hole type having one injection hole, An annealing furnace of the arrangement type in which the center of the above injection hole coincides with the center of the above hollow portion.

5. In paragraph 3, The above nozzle is provided as a multi-porous type having multiple injection holes, A batch type annealing furnace in which the plurality of injection holes include a first injection hole whose center is aligned with the center of the hollow portion, and a plurality of second injection holes arranged around the first injection hole.

6. In paragraph 5, A batch type annealing furnace in which the first injection hole has a larger diameter than the second injection hole.

7. In paragraph 1, The above nozzle is provided as a multi-porous type having multiple injection holes, A batch type annealing furnace in which each of the above plurality of injection holes has the same diameter.

8. In paragraph 7, A batch type annealing furnace in which the above plurality of injection holes are positioned on the same plane and are spaced equally apart from each other.

9. In paragraph 1, A plurality of coils are accommodated in the above annealing chamber, Each of the above coils is assigned multiple nozzles, A batch type annealing furnace in which multiple nozzles assigned to each of the above coils spray fluid to different parts of each of the above coils.

10. In paragraph 1, In the above annealing chamber, an exhaust passage is connected that is opened and closed by the first opening and closing means to discharge the internal fluid. An outside air introduction path that is opened and closed by a second opening and closing means is connected to the above duct to introduce outside air. The above duct includes a main passage extending from the combustion chamber and a connecting passage connecting the main passage and the nozzle. The above blower fan is installed on the main duct, A bypass path connecting two points of the main path to bypass the point where the blower fan is installed; A flow path switching valve provided at the intersection between the main flow path and the bypass flow path so that the fluid flowing in the nozzle direction passes through one of the main flow paths between the bypass flow path and both ends of the bypass flow path; and A batch type annealing furnace further comprising a cooler for cooling the above bypass path.

11. In paragraph 1, The space between the combustion chamber and the annealing chamber is partitioned in a ventilated state through a bulkhead having ventilation holes. A batch-type annealing furnace in which the above bulkhead is provided with a flame blocking member that blocks the flame of the above combustion chamber from flowing into the above annealing chamber through the above ventilation hole.

12. In paragraph 1, The space between the combustion chamber and the annealing chamber is partitioned in a ventilated state through a bulkhead having ventilation holes. The above burner is a batch type annealing furnace in which the body is installed so that the direction of the flame ejection avoids the direction of the baffle.

13. In paragraph 1, The space between the combustion chamber and the annealing chamber is partitioned in a ventilated state through a bulkhead having ventilation holes. The above burner has a nozzle that emits flame, The above-mentioned nozzle is a batch-type annealing furnace provided in the above-mentioned burner so that the direction of the flame ejection avoids the direction of the baffle.

14. In paragraph 1, The above burner is composed of multiple parts, A batch type annealing furnace wherein at least one of the above plurality of burners has a different capacity from the rest.

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