Gas processing device

Abstract

To provide a gas processing device which exhibits excellent performance in tar separation from a gas.SOLUTION: A gas processing device 101 processes a gas Ga containing tar and includes: a cylindrical cyclone container 10 having an intake port 10b and a processing space 11; a guide member 20 which is provided in a spiral shape around an axial direction X in the processing space 11 of the cyclone container 10; and an exhaust pipe 30 which exhausts a tar separated gas Gb, from which the tar is separated by the guide member 20 swiveling the gas Ga, from the cyclone container 10.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a gas treatment device. [Background technology]

[0002] Traditionally, automobiles and their parts are often coated with paint for rust prevention and aesthetic reasons. In this case, the workpieces must be dried in a high-temperature drying oven to form a coating. A smoky "tar" is generated as a by-product of drying the paint inside the oven. This tar can adhere to the oven walls, oven entrances, and factory ceilings, causing problems. Therefore, this type of gas treatment technology employs various devices to remove the tar from the gases generated in the oven.

[0003] One such device is disclosed in Patent Document 1. The tar removal device disclosed in Patent Document 1 is configured so that gas is introduced into the treatment space inside a cyclone vessel in a tangential direction to the inner wall surface, causing it to swirl along the inner wall surface, and the centrifugal force acting on the tar in the gas at this time is used to separate the tar from the gas. This tar removal device uses a structure known as a "tangential inflow cyclone." [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-155281 Summary of the Invention [Problem to be solved by the invention]

[0005] The tar removal device in Cited Document 1 utilizes a structure that swirls gas along the inner wall surface in the treatment space of a cyclone vessel. With this structure, it is expected that the swirling flow imparted to the gas will vary between the center and outer periphery of the cyclone vessel in the radial direction. As a result, it may not be possible to impart the desired swirling flow to the gas, and there is room for improvement in the separation efficiency when separating tar from the gas.

[0006] The present invention has been made in view of the above problems, and aims to provide a gas treatment device that has excellent performance in separating tar from gas. [Means for solving the problem]

[0007] One aspect of the present invention is A gas treatment device for treating a gas containing tar, a cylindrical cyclone vessel having an intake port and a treatment space; a guide member spirally disposed around the axial direction in the treatment space of the cyclone vessel; an exhaust pipe for exhausting the tar-separated gas from the cyclone vessel, the tar having been separated by the swirling of the gas by the guide member; a gas treatment device comprising: is located. [Effects of the Invention]

[0008] In the gas treatment device of the above aspect, a spiral guide member is provided around the axial direction in the processing space of the cylindrical cyclone vessel. When tar-containing gas is drawn into the processing space through the cyclone vessel's intake port, it contacts the guide surface of the spiral guide member and is guided through the processing space while swirling around the axial direction. The gas swirls along both the inner wall surface of the cyclone vessel and the guide surface of the guide member. This allows the gas to be given a desired swirling flow according to the spiral shape of the guide member, thereby suppressing variations in the swirling flow of the gas in the radial direction of the cyclone vessel. In addition, the guide member also serves to cool the gas through heat exchange upon contact with the gas. That is, the guide member performs both the function of imparting a swirling flow to the gas and the function of cooling the gas. Therefore, the gas containing smoky tar swirls while being cooled as it flows along the inner wall surface of the cyclone vessel and along the guide surface of the guide member, resulting in a low-temperature tar-separated gas from which the tar has been separated. The tar-separated gas is then exhausted from the cyclone vessel through an exhaust pipe.

[0009] The gas treatment device of the above configuration achieves a synergistic effect of the condensation of smoky tar by cooling the gas and the centrifugal separation of the tar by applying a swirling flow to the gas. As a result, the use of a spiral guide member can improve the separation efficiency of tar from the gas compared to a structure that simply swirls the gas along the inner wall surface of the cyclone vessel.

[0010] As described above, according to the above-described embodiment, it is possible to provide a gas treatment device that has excellent performance in separating tar from gas. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram schematically illustrating a gas treatment apparatus and a drying furnace according to a first embodiment. [Figure 2] FIG. 2 is a diagram showing the internal structure of a cyclone vessel of the gas treatment device of the first embodiment. [Figure 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. [Figure 4]FIG. 2 is a diagram for explaining the flow of gas in the cyclone vessel in FIG. 1. [Figure 5] 5 is a cross-sectional view taken along line VV in FIG. 4. [Figure 6] FIG. 10 is a diagram showing the internal structure of a cyclone vessel of a gas treatment device according to a second embodiment. [Figure 7] FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. 6. DETAILED DESCRIPTION OF THE INVENTION

[0012] Preferred embodiments of the above aspects are described below.

[0013] In the gas processing apparatus of the above aspect, it is preferable that the exhaust pipe has a gas inlet arranged downstream of the guide member in the gas flow direction, a gas outlet arranged upstream of the guide member in the gas flow direction, and an inner pipe portion extending along the axial direction through the processing space between the gas inlet and the gas outlet.

[0014] According to this gas treatment device, the inner pipe portion of the exhaust pipe is heated by heat exchange due to contact with the gas in the treatment space of the cyclone vessel. Therefore, the inner pipe portion of the exhaust pipe not only functions to direct the tar-separated gas flowing in from the gas inlet toward the gas outlet, but also functions to heat the tar-separated gas. As a result, the tar-separated gas is heated in the inner pipe portion and then discharged from the exhaust pipe. As a result, when the low-temperature tar-separated gas is heated at the discharge destination, the equipment costs and energy costs required for heating the tar-separated gas can be kept low.

[0015] In the gas treatment device of the above aspect, it is preferable that the guide member is provided between the outer peripheral surface of the inner pipe portion of the exhaust pipe and the inner wall surface of the cyclone vessel, and is joined to the outer peripheral surface of the inner pipe portion via a joint portion so as to be capable of thermal conduction.

[0016] According to this gas treatment device, the heat held by the guide member due to heat exchange with the gas is conducted to the inner pipe through the joint. Therefore, compared to a structure in which the guide member is not joined to the inner pipe, the tar-separated gas can be heated to a higher temperature in the inner pipe. Therefore, the equipment costs and energy costs required to heat the low-temperature tar-separated gas at the discharge destination can be reduced.

[0017] In the gas treatment device of the above aspect, when the joint portion is defined as a first joint portion, it is preferable that the guide member is joined to the inner wall surface of the cyclone vessel via a second joint portion in a manner allowing thermal conduction.

[0018] According to this gas treatment device, the heat held by the guide member due to heat exchange with the gas is conducted to the cyclone vessel via the second joint, thereby enhancing the gas cooling effect.

[0019] The gas treatment device of the above aspect preferably includes a cooler that cools a surface to be cooled, the surface being at least where the gas inlet of the exhaust pipe is located, in a radial cross section of the outer peripheral surface of the cyclone vessel.

[0020] According to this gas treatment device, the gas flowing through the treatment space of the cyclone vessel is cooled by cooling the cooled surface of the cyclone vessel with a cooler. In particular, the cooling effect on the gas flowing around the gas inlet of the exhaust pipe can be strengthened. This prevents the tar in the gas from flowing into the exhaust pipe in an uncondensed state through the gas inlet due to insufficient gas cooling.

[0021] In the gas treatment device of the above-mentioned aspect, the cyclone vessel is connected to an intake path that draws in the gas from a drying furnace that dries automobile bodies after painting, and the gas outlet of the exhaust pipe is connected to an exhaust path that exhausts the tar separation gas to the drying furnace.It is preferable that the device is equipped with a heat exchanger that heats the outside air by heat exchange between the cooling medium used in the cooler and the outside air, and a combustor that combusts the outside air heated by the heat exchanger and supplies it to the drying furnace.

[0022] According to this gas treatment device, gas containing tar flows from a drying oven used to dry painted automobile bodies through an intake path to the intake port of the cyclone container. Furthermore, the tar-separated gas after treatment in the cyclone container flows through the inner tube of the exhaust pipe and then returns to the drying oven from the gas outlet through the exhaust path. This allows the low-temperature tar-separated gas to be returned to the drying oven in a heated state in the inner tube of the exhaust pipe. Additionally, the drying oven can be heated by heating outside air through heat exchange with a cooling medium in a heat exchanger, then combusting it in a combustor and supplying it to the drying oven. As a result, the equipment costs and energy costs required for heating the drying oven can be kept low.

[0023] Specific embodiments of the gas treatment device of the above aspect will be described below with reference to the drawings. In the drawings, unless otherwise specified, the axial direction of the cyclone vessel is indicated by arrow X, the radial direction of the cyclone vessel is indicated by arrow Y, and the circumferential direction of the cyclone vessel is indicated by arrow Z.

[0024] (Embodiment 1) 1. Structure of Drying Furnace 1 As shown in FIG. 1, the drying furnace 1 is a paint drying furnace for drying workpieces W, which are automobile bodies after a paint treatment. This drying furnace 1 is operated with the workpieces W carried into the furnace interior space 2 at a high temperature, for example, at an internal furnace temperature of approximately 120 to 170°C. Therefore, the drying furnace 1 generates high-temperature gas Ga resulting from the paint. This gas Ga is a smoke-like product of gasification of the paint in the furnace interior space 2 of the drying furnace 1, and contains volatile organic compounds, other odorous gases, and tar. Volatile organic compounds are typically primarily composed of formaldehyde and acetaldehyde. These volatile organic compounds are also commonly referred to as "VOC gases." This gas Ga also contains nitrogen oxides (hereinafter referred to as "NOX") generated in the combustor 60.

[0025] 2. Overall structure of gas treatment device 101 1, a gas treatment device 101 of the first embodiment is a device for performing gas treatment related to a drying furnace 1. The gas treatment device 101 includes, as its main components, a cyclone vessel 10, a guide member 20, an exhaust pipe 30, a cooler 40, a heat exchanger 50, and a combustor 60.

[0026] The cyclone vessel 10 is a stationary vessel that does not rotate. The cyclone vessel 10 is configured as a cylindrical member made of a metal material. In this embodiment, the cyclone vessel 10 is used in a generally vertical position with the axial direction X as the up-down direction. If necessary, the cyclone vessel 10 may be used in a position tilted at any angle relative to the axial direction X.

[0027] The cyclone vessel 10 has an intake port 10b and a processing space 11. The intake port 10b is provided at one end 10a so as to draw in the gas Ga linearly from one end 10a, which corresponds to the upper end of the cyclone vessel 10, toward the other end 10c, which corresponds to the lower end. The intake port 10b is connected to an intake path 3 that draws in the gas Ga from the drying furnace 1. Therefore, the gas Ga generated in the furnace space 2 of the drying furnace 1 is drawn into the processing space 11 of the cyclone vessel 10 through the intake path 3.

[0028] The cyclone vessel 10 has a conical cylindrical portion 16 on the other end 10c side in the axial direction X. The conical cylindrical portion 16 is a tapered portion whose dimension in the radial direction Y of the processing space 11 gradually decreases from the large-diameter cylindrical portion 12, which has a constant dimension in the radial direction Y, toward the other end 10c (i.e., as it moves away from the intake port 10b). In addition, a tar-receiving container 17 is installed on the other end 10c side of the cyclone vessel 10.

[0029] The exhaust pipe 30 is used to exhaust the tar-separated gas Gb, which has been separated by the swirling of the gas Ga by the guide member 20, from the cyclone vessel 10. The exhaust pipe 30 has a gas inlet 30a, a gas outlet 30b, and an inner pipe section 31. The gas inlet 30a is located downstream of the guide member 20 in the gas flow direction in the processing space 11 of the cyclone vessel 10. That is, the gas inlet 30a is located lower than the guide member 20. Therefore, the gas Ga can flow in from the gas inlet 30a after being guided by the guide member 20. The gas outlet 30b is located upstream of the guide member 20 in the gas flow direction in the processing space 11 of the cyclone vessel 10. The inner pipe section 31 is provided to extend in the axial direction X through the processing space 11 between the gas inlet 30a and the gas outlet 30b of the exhaust pipe 30.

[0030] The gas outlet 30b of the exhaust pipe 30 is connected to an exhaust path 4 that exhausts the tar separation gas Gb to the drying furnace 1. A suction fan 5 is provided in the exhaust path 4. The suction fan 5 uses its suction force to suck the gas Ga from the drying furnace 1 through the intake path 3 into the treatment space 11 of the cyclone vessel 10, and also to exhaust the tar separation gas Gb from the exhaust pipe 30 of the cyclone vessel 10 to the drying furnace 1 through the exhaust path 4.

[0031] The guide member 20 is provided in a spiral shape around the axial direction X in the processing space 11 of the cyclone vessel 10. This guide member 20 serves to guide the gas Ga taken in from the inlet port 10b toward the other end 10c of the cyclone vessel 10 while imparting a swirling flow to the gas Ga in the processing space 11. This guide member 20 is made of a metal material with high thermal conductivity for heat exchange with the gas Ga.

[0032] 3. Structure of the cooler 40 1, the cooler 40 includes a jacket portion 41 having a flow space (not shown) through which the cooling medium C flows, a tank 45 that stores the cooling medium C, and a pump 46 that circulates the cooling medium C between the jacket portion 41 and the tank 45. In this embodiment, the jacket portion 41 surrounds a portion of the outer peripheral surface 14 of the cyclone vessel 10 and is provided so as to cool a cooled surface 14a on which at least the gas inlet 30a of the exhaust pipe 30 is located in a cross section of the outer peripheral surface 14 of the cyclone vessel 10 in the radial direction Y. The pump 46 has an intake port connected to the tank 45 and a discharge port connected to the inlet 42 of the jacket portion 41. An outlet 43 of the jacket portion 41 is connected to the tank 45 via a circulation path 44.

[0033] In the cooler 40 configured as described above, the cooling medium C in the tank 45 is pressurized by the pump 46 and supplied to the jacket portion 41 from the inlet 42. As the cooling medium C flows through the circulation space of the jacket portion 41, it is heated by heat exchange with the surface 14a to be cooled of the cyclone vessel 10. In contrast, the surface 14a to be cooled of the cyclone vessel 10 is cooled by the cooling medium C in the jacket portion 41, and the gas Ga in the processing space 11 is cooled accordingly. The cooling medium C flows through the outlet 43 of the jacket portion 41 and then flows through the circulation path 44. At this time, the cooling medium C is cooled by the heat exchanger 50 provided in the circulation path 44 and then collected in the tank 45.

[0034] The type of cooling medium C used in the cooler 40 is not particularly limited. As the cooling medium C, for example, cooling water, a fluorocarbon-based refrigerant, a chlorofluorocarbon-based refrigerant, an alcohol-based refrigerant, a ketone-based refrigerant, or the like can be appropriately selected and used.

[0035] 4. Structure of the heat exchanger 50 1, the heat exchanger 50 is for exchanging heat between the cooling medium C used in the cooler 40 and the outside air. According to this heat exchanger 50, the outside air is heated, while the cooling medium C flowing out from the outlet 43 of the jacket portion 41 is cooled.

[0036] 5. Structure of the combustor 60 1, the combustor 60 combusts the outside air heated by the heat exchanger 50 and supplies the combustor 60 to the drying furnace 1. The outside air drawn in by the suction fan 8 is combusted with LNG as fuel in the combustor 60. The heating gas Gc generated by this combustion is supplied to the drying furnace 1 through the supply path 6 by the suction force of the suction fan 8.

[0037] 6. Internal structure of the cyclone vessel 10 As shown in FIG. 2, the guide member 20 has a guide surface 20a that extends spirally around an axis L along the outer circumferential surface 31a of the inner pipe portion 31 of the exhaust pipe 30. The guide surface 20a is a swirling flow imparting surface for imparting a swirling flow to the gas Ga. The axis L is the central axis of the large-diameter cylindrical portion 12 of the cyclone vessel 10, and is also the central axis of the inner pipe portion 31 of the exhaust pipe 30. In other words, the large-diameter cylindrical portion 12 of the cyclone vessel 10 and the inner pipe portion 31 of the exhaust pipe 30 are configured to be concentric. This configuration simplifies the structure in which both the guide member 20 and the inner pipe portion 31 of the exhaust pipe 30 are disposed in the processing space 11 of the cyclone vessel 10.

[0038] The guide member 20 is provided between the outer peripheral surface 31a of the inner pipe portion 31 of the exhaust pipe 30 and the inner wall surface 13 of the large-diameter cylindrical portion 12 of the cyclone vessel 10. The guide member 20 has an inner diameter that roughly matches the outer diameter of the inner pipe portion 31 of the exhaust pipe 30, and an outer diameter that roughly matches or is slightly smaller than the inner diameter of the large-diameter cylindrical portion 12 of the cyclone vessel 10, and is a spiral blade with a uniform plate thickness. The guide member 20 may be right-handed or left-handed.

[0039] As shown in FIG. 3 , the guide member 20 is formed so that its outer shape is circular when viewed from the axial direction X. The guide member 20 is integrated with the exhaust pipe 30 and is joined to the outer peripheral surface 31 a of the inner pipe portion 31 of the exhaust pipe 30 via a joint 21 in a manner allowing thermal conduction. In this embodiment, the joint 21 is a weld point that joins the guide member 20 and the inner pipe portion 31 intermittently in the circumferential direction Z by welding. Alternatively, the joint 21 may be a weld line that joins the guide member 20 and the inner pipe portion 31 continuously in the circumferential direction Z by welding. A gap 15 may be formed between the outer peripheral surface of the guide member 20 and the inner wall surface 13 of the large-diameter cylindrical portion 12 of the cyclone vessel 10 (see FIGS. 2 and 3 ), or there may be no gap and the outer peripheral surface of the guide member 20 may be in contact with the inner wall surface 13 of the large-diameter cylindrical portion 12 of the cyclone vessel 10.

[0040] 7. Operation of Drying Furnace 1 As shown in Fig. 1, when the drying furnace 1 is operated, the combustor 60 and the suction fan 8 are operated in advance. The heating gas Gc generated at this time is supplied to the drying furnace 1 through the supply path 6. As a result, the furnace interior space 2 of the drying furnace 1 can be heated to a predetermined temperature, and the workpieces W can be dried in the furnace interior space 2.

[0041] 8. Operation of the cyclone vessel 10 As shown in Figure 1, when using the cyclone vessel 10, the cooler 40 and the suction fan 5 are operated in advance. This starts gas circulation between the drying furnace 1 and the cyclone vessel 10. At this time, gas Ga generated in the furnace space 2 of the drying furnace 1 is sucked into the treatment space 11 of the cyclone vessel 10 through the intake path 3, and the tar-separated gas Gb obtained in the treatment space 11 of the cyclone vessel 10 is returned to the drying furnace 1 through the exhaust path 4.

[0042] 4, gas Ga in the furnace interior space 2 of the drying furnace 1 is drawn linearly in the axial direction X from the intake port 10b of the cyclone vessel 10 toward the processing space 11. Thereafter, the gas Ga comes into contact with the guide surface 20a of the guide member 20 in the processing space 11. As a result, the gas flow direction of the gas Ga changes from a linear direction along the axial direction X to a direction following the guide surface 20a of the guide member 20 (i.e., a direction around the axis L of the inner pipe portion 31 of the exhaust pipe 30).

[0043] At this time, a desired swirling flow Fa is imparted to the gas Ga according to the spiral shape of the guide surface 20a of the guide member 20 (see FIGS. 4 and 5). Therefore, the gas Ga flows downward through the treatment space 11 of the cyclone vessel 10 toward the other end 10c. Because the swirl diameter is smaller in the conical cylindrical portion 16 of the cyclone vessel 10 than in the upstream side, the gas Ga swirls at an increased flow rate. After reaching the vicinity of the other end 10c of the cyclone vessel 10, the gas Ga changes direction from downward to upward, forming a reversed upward flow Fb toward the gas inlet 30a of the exhaust pipe 30. The tar-separated gas Gb flowing in through the gas inlet 30a flows upward through the inner pipe portion 31 and is then exhausted from the gas outlet 30b of the exhaust pipe 30. The tar-separated gas Gb is heated by heat exchange with the inner pipe portion 31 as it flows through the inner pipe portion 31.

[0044] The tar N contained in the gas Ga is condensed and liquefied as the gas Ga is cooled to a temperature below the condensation temperature while swirling. Then, this gas Ga is centrifuged to separate the liquefied tar N and the tar-separated gas Gb due to the difference in specific gravity, and the tar N is removed from the gas Ga. In this embodiment, the gas Ga is cooled by the following two-stage cooling structure.

[0045] The first-stage cooling structure is a structure in which the gas Ga is cooled by heat exchange with the guide member 20, and also by heat exchange with the inner pipe portion 31 of the exhaust pipe 30. According to this first-stage cooling structure, the gas Ga is cooled by heat exchange when it comes into contact with the guide member 20 and the inner pipe portion 31 of the exhaust pipe 30.

[0046] The second-stage cooling structure is a structure in which the cooled surface 14a of the cyclone vessel 10 is cooled by the jacket portion 41 of the cooler 40. According to this second-stage cooling structure, the gas Ga is cooled by heat exchange when it comes into contact with the inner wall surface 13 of the cyclone vessel 10, which is cooled by the cooling medium C flowing through the jacket portion 41.

[0047] As shown in Fig. 5, the tar N separated from the gas Ga is pressed against and adheres to the inner wall surface 13 of the cyclone vessel 10 by the centrifugal force A caused by the swirling flow Fa. Thereafter, the tar N descends due to gravity through the gap 15 between the outer peripheral surface of the guide member 20 and the inner wall surface 13 of the large-diameter cylindrical portion 12 of the cyclone vessel 10, as shown in Fig. 4. The tar N also flows along the spiral guide surface 20a of the guide member 20 and descends along the inner pipe portion 31 of the exhaust pipe 30.

[0048] 5, in the conical cylindrical portion 16 of the cyclone vessel 10, the flow velocity of the gas Ga increases, thereby increasing the centrifugal force A due to the swirling flow Fa and improving the separation efficiency of the tar N. Furthermore, in the conical cylindrical portion 16 of the cyclone vessel 10, the flow of the gas Ga switches from the swirling flow Fa to the reversed upward flow Fb, which prevents the tar N from moving against gravity toward the gas inlet 30a of the exhaust pipe 30. After the tar N has been separated from the gas Ga, the tar-separated gas Gb flows into the gas inlet 30a of the exhaust pipe 30 following the reversed upward flow Fb.

[0049] 4, in this embodiment, a tar discharge port 10d is provided at the other end 10c of the cyclone vessel 10, and a tar receiving container 17 is installed directly below the tar discharge port 10d. As a result, the tar N separated from the gas Ga falls from the tar discharge port 10d of the cyclone vessel 10 into the tar receiving container 17 due to gravity and is collected.

[0050] According to the above-described first embodiment, the following effects can be obtained.

[0051] In the gas processing apparatus 101 of the first embodiment, a spiral guide member 20 is provided around the axial direction X in the processing space 11 of the cylindrical cyclone vessel 10. When gas Ga containing tar N is drawn into the processing space 11 through the inlet 10b of the cyclone vessel 10, it comes into contact with the guide surface 20a of the spiral guide member 20 and is guided through the processing space 11 while swirling around the axial direction X. At this time, the gas Ga swirls along both the inner wall surface 13 of the cyclone vessel 10 and the guide surface 20a of the guide member 20. This allows the gas Ga to be given a desired swirling flow Fa that conforms to the spiral shape of the guide member 20, thereby suppressing variations in the swirling flow of the gas Ga in the radial direction Y of the cyclone vessel 10. In addition, the guide member 20 also serves to cool the gas Ga through heat exchange upon contact with the gas Ga. That is, the guide member 20 performs both the function of imparting a swirling flow to the gas Ga and the function of cooling the gas Ga. Therefore, the gas Ga containing smoky tar N swirls while being cooled as it flows along the inner wall surface 13 of the cyclone vessel 10 and along the guide surface 20a of the guide member 20, and becomes a low-temperature tar-separated gas Gb from which the tar N has been separated. The tar-separated gas Gb is then exhausted from the cyclone vessel 10 through the exhaust pipe 30.

[0052] The gas treatment device having the above configuration achieves a synergistic effect of the condensation of tar N by cooling the gas Ga and the centrifugal separation of tar N by applying a swirling flow to the gas Ga. As a result, by using the spiral guide member 20, the separation efficiency of tar N in the Ga gas can be improved compared to a structure in which the gas Ga is simply swirled only along the inner wall surface 13 of the cyclone vessel 10.

[0053] Therefore, according to the first embodiment, it is possible to provide the gas processing device 101 that has an excellent performance in separating the tar N from the gas Ga.

[0054] Furthermore, according to the gas processing device 101, the inner pipe portion 31 of the exhaust pipe 30 is heated by heat exchange due to contact with the gas Ga in the processing space 11 of the cyclone vessel 10. Therefore, the inner pipe portion 31 of the exhaust pipe 30 not only functions to direct the tar separation gas Gb flowing in from the gas inlet 30a toward the gas outlet 30b, but also functions to heat the tar separation gas Gb. As a result, the tar separation gas Gb is heated in the inner pipe portion 31 and exhausted from the exhaust pipe 30. Furthermore, heat retained in the guide member 20 by heat exchange with the gas Ga is conducted to the inner pipe portion 31 via the joint portion 21. Therefore, compared to a structure in which the guide member 20 is not joined to the inner pipe portion 31, the tar separation gas Gb can be heated to a higher temperature in the inner pipe portion 31. As a result, the equipment costs and energy costs required to heat the low-temperature tar separation gas Gb can be kept low.

[0055] Furthermore, according to the gas processing device 101, the gas Ga flowing through the processing space 11 of the cyclone vessel 10 is cooled by cooling the cooled surface 14a of the cyclone vessel 10 with the cooler 40. In particular, the cooling effect of the gas Ga flowing around the gas inlet 30a of the exhaust pipe 30 can be strengthened. This makes it possible to prevent the tar N in the gas Ga from flowing into the exhaust pipe 30 from the gas inlet 30a in an uncondensed state due to insufficient cooling of the gas Ga.

[0056] Furthermore, with the gas treatment device 101, gas Ga containing tar N flows from the drying furnace 1, which dries the workpieces W after coating processing, through the intake path 3 to the intake port 10b of the cyclone vessel 10. Furthermore, the tar-separated gas Gb after processing in the cyclone vessel 10 flows through the inner pipe portion 31 of the exhaust pipe 30 and then returns to the drying furnace 1 from the gas outlet 30b through the exhaust path 4. Therefore, the low-temperature tar-separated gas Gb can be returned to the drying furnace 1 in a heated state in the inner pipe portion 31 of the exhaust pipe 30. Additionally, the drying furnace 1 can be heated by heat exchange between outside air and the cooling medium C in the heat exchanger 50, and then combusted in the combustor 60 and supplied to the drying furnace 1. As a result, the equipment costs and energy costs required for heating the drying furnace 1 can be kept low.

[0057] Next, other embodiments related to the above-described embodiment 1 will be described with reference to the drawings. In the other embodiments, the same elements as those in embodiment 1 are denoted by the same reference numerals, and the description of the same elements will be omitted.

[0058] (Embodiment 2) As shown in FIGS. 6 and 7, the gas treatment device 101 of the second embodiment differs from the cyclone vessel 10 of the first embodiment in the structure of the cyclone vessel 10A.

[0059] In this gas processing device 101, when the joint 21 is defined as the first joint 21, the guide member 20 is joined to the inner wall surface 13 of the cyclone vessel 10A via the second joint 22 in a manner allowing thermal conduction. That is, the inner peripheral surface of the guide member 20 is joined to the outer peripheral surface 31a of the inner pipe portion 31 of the exhaust pipe 30 by the first joint 21, and the outer peripheral surface of the guide member 20 is joined to the inner wall surface 13 of the cyclone vessel 10A by the second joint 22.

[0060] In this embodiment, the second joints 22 are welding points that intermittently join the guide member 20 and the inner wall surface 13 of the cyclone vessel 10A by welding in the circumferential direction Z. Alternatively, the second joints 22 may be welding lines that continuously join the guide member 20 and the inner wall surface 13 of the cyclone vessel 10A in the circumferential direction Z by welding.

[0061] The other configurations and gas processing methods are the same as those in the first embodiment.

[0062] According to the gas treatment device 101 of the second embodiment, the heat held by the guide member 20 heated by heat exchange with the gas Ga is conducted to the cyclone vessel 10 via the second joint portion 22. This can enhance the cooling effect of the gas Ga.

[0063] In addition, the same effects as those of the first embodiment are achieved.

[0064] The present invention is not limited to the above-described embodiments, and various applications and modifications are possible without departing from the scope of the present invention. For example, the following embodiments can be implemented by applying the above-described embodiments.

[0065] In the above embodiment, the cyclone vessel 10 having the large-diameter cylindrical portion 12 and the conical cylindrical portion 16 is used as an example, but the structure of the cyclone vessel 10 is not limited to this and can be appropriately modified as needed. For example, a structure in which the conical cylindrical portion 16 of the cyclone vessel 10 is omitted may be adopted.

[0066] In the embodiment described above, the guide member 20 and the exhaust pipe 30 are integrated together, but instead, the guide member 20 and the exhaust pipe 30 may be separate structures.

[0067] In the above embodiment, an example has been given of the case where the cyclone vessel 10 is cooled by the cooler 40, but instead, for example, if the desired cooling effect on the gas Ga can be obtained by the guide member 20, the cooler 40 may be omitted.

[0068] In the above embodiment, the case has been exemplified where the intake source for gas Ga into the cyclone vessel 10 and the exhaust destination for the tar separation gas Gb from the cyclone vessel 10 are both drying furnaces 1 for drying workpieces W, which are painted automobile bodies, but the intake source for gas Ga and the exhaust destination for the tar separation gas Gb are not limited to the drying furnace 1. For example, the intake source for gas Ga may be a drying furnace for drying parts other than automobile bodies or workpieces in fields other than automobiles, or equipment other than a drying furnace. In addition, the exhaust destination for the tar separation gas Gb may be an odor removal device, the atmosphere, or the like. [Explanation of symbols]

[0069] DESCRIPTION OF SYMBOLS 1...drying furnace, 3...air intake path, 4...exhaust path, 10, 10A...cyclone vessel, 10b...air intake port, 11...treatment space, 13...inner wall surface, 14...outer peripheral surface, 14a...cooled surface, 20...guide member, 21...joint (first joint), 22...second joint, 30...exhaust pipe, 30a...gas inlet, 30b...gas outlet, 31...inner pipe portion, 31a...outer peripheral surface, 40...cooler, 50...heat exchanger, 60...combustor, 101...gas treatment device, C...cooling medium, Ga...gas, Gb...tar separation gas, N...tar, W...workpiece (automobile body), X...axial direction, Y...radial direction

Claims

1. A gas treatment device for treating a gas containing tar, comprising: a cylindrical cyclone vessel having an intake port and a treatment space; a guide member provided in a spiral shape around an axial direction in the treatment space of the cyclone vessel; an exhaust pipe for exhausting the tar-separated gas from the cyclone container, the tar being separated by the swirling of the gas by the guide member; A gas treatment device comprising:

2. 2. The gas processing apparatus according to claim 1, wherein the exhaust pipe has a gas inlet arranged downstream of the guide member in the gas flow direction, a gas outlet arranged upstream of the guide member in the gas flow direction, and an inner pipe portion extending along the axial direction through the processing space between the gas inlet and the gas outlet.

3. 3. The gas treatment device according to claim 2, wherein the guide member is provided between an outer circumferential surface of the inner pipe portion of the exhaust pipe and an inner wall surface of the cyclone vessel, and is joined to the outer circumferential surface of the inner pipe portion via a joint so as to be capable of thermal conduction.

4. 4 . The gas treatment device according to claim 3 , wherein the guide member is joined to the inner wall surface of the cyclone vessel via a second joint portion so as to be capable of thermal conduction when the joint portion is defined as a first joint portion.

5. 5. The gas treatment device according to claim 2, further comprising a cooler that cools a surface to be cooled, at least where the gas inlet of the exhaust pipe is located, in a radial cross section of an outer peripheral surface of the cyclone vessel.

6. the cyclone vessel is connected to an intake path for taking in the gas from a drying furnace for drying a painted automobile body, and a gas outlet of the exhaust pipe is connected to an exhaust path for discharging the tar separation gas to the drying furnace, a heat exchanger that heats the outside air by heat exchange between a cooling medium used in the cooler and the outside air; a combustor that combusts the outside air heated by the heat exchanger and supplies the combustor to the drying furnace; The gas treatment device of claim 5 , comprising:

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