Exhaust guide, vertical pulverizer, and exhaust method

Abstract

An exhaust guide for a vertical pulverizer having a classifier that classifies powder by a rotor, which exhausts gas mixed with the powder. The exhaust guide includes a housing and a core. A gas flow path is formed inside the housing. The core is disposed inside the housing. An opening for introducing gas into the inside of the housing from the lower side is formed in the housing. The outer peripheral portion of the housing has a curved portion and a straight portion. The straight portion is connected to the curved portion in a tangential direction. The center line of the gas flow path corresponding to the straight portion is offset with respect to the center of the core in plan view. An exhaust port for exhausting gas is formed at the terminal end of the gas flow path corresponding to the straight portion.

Description

Technical Field

[0001] This disclosure relates to gas emissions in a vertical pulverizer. Background Technology

[0002] In vertical pulverizers for crushing raw materials, a structure having a gas inlet and a gas outlet is known. Patent Document 1 discloses such a vertical pulverizer.

[0003] In Patent Document 1, the gas inlet is located at the lower part of the vertical pulverizer, and the product outlet is located in the upper shell of the vertical pulverizer. The raw material pulverized by the pulverizing roller is blown up by gas introduced from the gas inlet. The blown-up raw material is classified by a separator with a rotating part. The classified powdered raw material is taken out from the product outlet along with the gas.

[0004] The separator is housed in an upper housing. The upper housing covers the separator. The upper housing includes a base with a center point. In Patent Document 1, the center point of the base is eccentrically positioned relative to the rotational axis of the separator.

[0005] In Patent Document 1, because the eccentric configuration can eliminate the deviation of the theoretical grading point in the circumferential direction of the separator, the particle size distribution of the product can be reduced and the product quality can be improved.

[0006] [Existing Technical Documents]

[0007] [Patent Documents]

[0008] Patent Document 1: Japanese Patent No. 6497079 Summary of the Invention

[0009] The problem that the invention aims to solve

[0010] In the vertical pulverizer described in Patent Document 1, the swirling airflow generated by the rotation of the rotor causes pressure loss as it passes through the upper casing located on top of it. This pressure loss leads to increased power consumption of the blower fan and other components.

[0011] In Patent Document 1, although the base of the upper shell is eccentrically positioned, this is to reduce the particle size of the gradation, without considering pressure loss. Therefore, a structure that takes energy efficiency into account is needed.

[0012] This disclosure is made in view of the aforementioned circumstances, and its purpose is to reduce the pressure loss of airflow and improve energy efficiency in the exhaust guide of a vertical crusher.

[0013] Solution for solving the problem

[0014] The problem to be solved in this disclosure is as described above. The following describes the solution to the problem and its effects.

[0015] According to a first aspect of this disclosure, an exhaust guide with the following structure is provided. That is, the exhaust guide is used in a vertical pulverizer having a separator that classifies powder by a rotor, to discharge gas mixed with powder. The exhaust guide includes a housing and a core. A gas flow channel is formed inside the housing. The core is disposed inside the housing. An opening for introducing gas from below into the interior of the housing is formed on the housing. The outer periphery of the housing has a curved portion and a straight portion. The straight portion connects to the curved portion tangentially. Viewed from above, the centerline of the gas flow channel corresponding to the straight portion is offset relative to the center of the core. An exhaust port for discharging gas is formed at the end of the gas flow channel corresponding to the straight portion.

[0016] According to a second aspect of this disclosure, a method for venting gas mixed with powder is provided in a vertical pulverizer having a separator that classifies the powder by a rotor. The vertical pulverizer includes a housing and a core. A gas flow channel is formed inside the housing. The core is disposed inside the housing. An opening is formed on the housing for introducing gas from below into the housing. The outer periphery of the housing has a curved portion and a straight portion. The straight portion connects to the curved portion in a tangential direction. Viewed from above, the centerline of the gas flow channel corresponding to the straight portion is offset relative to the center of the core. The venting method includes a first step, a second step, and a third step. In the first step, gas is introduced into the housing from the opening. In the second step, gas inside the housing flows sequentially along the curved portion and the straight portion. In the third step, the gas flowing along the straight portion is discharged from the vent.

[0017] Therefore, because the introduced gas rises and swirls while being discharged from the exhaust port in a manner that does not impede its swirling motion, deviations in airflow velocity near the exhaust port are particularly effective in suppressing these deviations. As a result, pressure loss in the exhaust guide is effectively reduced, leading to energy savings. Furthermore, because airflow turbulence is reduced within the exhaust guide, wear on the inner walls is suppressed, resulting in good durability.

[0018] The effects of the invention

[0019] According to this disclosure, the exhaust guide of a vertical pulverizer can reduce the pressure loss of airflow and improve energy efficiency. Attached Figure Description

[0020] Figure 1 This is a perspective view showing the overall structure of a vertical pulverizer according to one embodiment of the present disclosure.

[0021] Figure 2 This is a three-dimensional view of the exhaust guide from above.

[0022] Figure 3 This is a top view of the exhaust guide.

[0023] Figure 4 This is a 3D view of the exhaust guide from below.

[0024] Figure 5 This is a diagram illustrating the velocity distribution of the airflow at the exhaust port in the comparative example's exhaust guide.

[0025] Figure 6 This is a diagram illustrating the velocity distribution of the airflow at the exhaust port in the exhaust guide of this embodiment. Detailed Implementation

[0026] The embodiments of this disclosure will now be described with reference to the accompanying drawings. Figure 1 This is a perspective view showing the overall structure of a vertical pulverizer 1 according to one embodiment of the present disclosure. Figure 2 This is a three-dimensional view of the exhaust guide 16 viewed from above. Figure 3 This is a top view of the exhaust guide 16. Figure 4 This is a perspective view of the exhaust guide 16 from below.

[0027] Figure 1 The vertical crusher 1 shown is capable of crushing the input material. Examples of materials that can be crushed include cement, slag, and coal, but it is not limited to these.

[0028] The vertical crusher 1 includes a reducer 2, a lower housing 3, an upper housing 4, a rotary table 5, a crushing roller 6, a hydraulic cylinder 9, a coarse powder return guide 11, a feeding chute 12, a separator 15, and an exhaust guide 16. To easily understand the internal structure of the vertical crusher 1, the following is provided: Figure 1 In the middle, a portion of the structure is displayed in three dimensions using dots and dashes.

[0029] A rotary table 5 is mounted on the upper part of the reducer 2. The rotary table 5 is supported in a manner that allows it to rotate about a rotation axis in the vertical direction.

[0030] An electric motor 60, serving as a drive source, is positioned near the reducer 2. The rotation of the output shaft of the electric motor 60 is transmitted to the reducer 2 via a transmission shaft 61. The reducer 2 reduces the rotation input from the electric motor 60 and transmits it to the rotary table 5.

[0031] The rotating platform 5 is circular when viewed from above. The rotating platform 5 receives materials fed into the vertical pulverizer 1 for pulverization. Multiple pulverizing rollers 6 are arranged on the periphery of the upper surface of the rotating platform 5. The number of pulverizing rollers 6 is arbitrary. The lower housing 3 is arranged around the rotating platform 5 and the space above it. The multiple pulverizing rollers 6 are located within the interior space of the lower housing 3.

[0032] A support 7 is provided around the reducer 2 (outside the lower housing 3) in a manner corresponding to each crushing roller 6. A pressure arm 8 is rotatably supported on the support 7, which is used to apply pressure to the crushing roller 6 onto the rotary table 5.

[0033] The pressure arm 8 is elongated in the vertical direction. The middle portion of the pressure arm 8 along its length is supported by the bracket 7 in a manner that allows it to rotate about a horizontal axis. The lower end of the pressure arm 8 is connected to the hydraulic cylinder 9. The upper end of the pressure arm 8 is connected to the support member 10, which will be described later.

[0034] The support member 10 is a cylindrical component whose axis, viewed from above, is arranged radially along the rotary table 5. The support member 10 is rotatably supported by the bracket 7. The front end of the support member 10 is inserted into the interior of the lower housing 3. The crushing roller 6 is cantilevered at the front end of the support member 10.

[0035] One end of the hydraulic cylinder 9 is connected to the ground, and the other end is connected to the pressure arm 8. When the hydraulic cylinder 9 is driven in the direction of retraction, a force can be applied through the pressure arm 8 and the support member 10 to move the crushing roller 6 toward the rotary table 5.

[0036] A funnel-shaped coarse powder return guide 11 is disposed above the rotary table 5. The lower part of the coarse powder return guide 11 is formed into a small-diameter cylinder. A downward opening is formed at the lower end of the coarse powder return guide 11, which is opposite to the center of the upper surface of the rotary table 5.

[0037] A cylindrical infeed chute 12 is connected midway to the lower part of the coarse powder return guide 11. The infeed chute 12 is inclined and extends through the upper housing 4. An infeed port 13 is formed on the outside of the upper housing 4 and at the end of the infeed chute 12.

[0038] The upper part of the coarse powder return guide 11 is formed into a hollow cone shape whose diameter increases as it faces upward. The upper end of the coarse powder return guide 11 opens upward.

[0039] A separator 15 is provided at the top of the vertical crusher 1. The separator 15 has fixed blades 14 and a rotor 31.

[0040] Multiple fixed blades 14 are disposed above the outer peripheral portion of the opening formed at the upper end of the coarse powder return guide 11. The multiple fixed blades 14 are arranged circumferentially at appropriate intervals, generally along the outer periphery of the opening of the coarse powder return guide 11. Each fixed blade 14 is elongated in the vertical direction.

[0041] The rotor 31 is disposed inside the upper housing 4 and is suspended above the coarse powder return guide 11. The rotor 31 is rotatable about a vertical axis of rotation. The rotor 31 includes a plurality of rotating blades 33. The plurality of rotating blades 33 are arranged circumferentially at appropriate intervals. Each rotating blade 33 is elongated in the vertical direction. The rotating blades 33 are located on the inner circumferential side close to the fixed blade 14.

[0042] The central shaft 34 of the rotor 31 is fixed to a transmission shaft 35 for transmitting rotational force to the rotor 31. The transmission shaft 35 is connected to a suitable drive source (not shown). Thus, the rotor 31 can be driven along... Figure 1 The thick arrowhead rotates in the direction of rotation.

[0043] An annular frame 36 is disposed on the outer periphery of the upper part of the central shaft 34. The annular frame 36 is fixed to the central shaft 34 by a plurality of rod-shaped members 37. Each rod-shaped member 37 is formed to be elongated in the radial direction. The plurality of rod-shaped members 37 are arranged circumferentially at appropriate intervals. The upper end of each rotating blade 33 is fixed to the annular frame 36.

[0044] A base plate 38 is fixed to the lower part of the central shaft 34. The base plate 38 is formed into a cone shape with a larger diameter towards the bottom. The lower end of each rotating blade 33 is fixed to the outer periphery of the base plate 38.

[0045] The space between the central shaft 34 and the rotating blade 33 is open above and closed below by the base plate 38. The interior space of the rotor 31 is connected to the interior space of the exhaust guide 16 disposed above the rotor 31.

[0046] A hollow exhaust guide 16 is fixed above the upper housing 4. The interior space of the exhaust guide 16 opens downwards. This opening is connected to the interior of the upper housing 4. An exhaust port 41 facing obliquely upwards is formed on the exhaust guide 16. The structure of the exhaust guide 16 will be described in detail later.

[0047] An inlet 71 for introducing gas (hot air) into the interior of the lower housing 3 is formed at the lower part of the housing 3.

[0048] The following describes the operation of the vertical crusher 1 of this embodiment as an example of applying it to the fine grinding process of a cement manufacturing equipment.

[0049] When the vertical crusher 1 starts operating, the rotating table 5 and the rotor 31 rotate. In this state, a mixture made by mixing clinker, which is an intermediate product of cement, with by-products such as gypsum is fed into the feed port 13 of the vertical crusher 1.

[0050] The fed clinker and by-products fall from the lower end of the coarse powder return guide 11 to the center of the rotary table 5 via the feeding chute 12 and the coarse powder return guide 11. The clinker and by-products rotate together with the rotary table 5 and move outwards under centrifugal force. As a result, the clinker and by-products are crushed by the crushing rollers 6 located on the outer periphery of the rotary table 5.

[0051] The pulverized clinker and by-product powder (hereinafter referred to as powder) is blown up by gas supplied from the inlet 71. After being guided towards the outer periphery of the fixed blades 14 through the upper conical portion of the coarse powder return guide 11, the powder passes between the fixed blades 14 from the outer periphery to the inner periphery along with the gas. If the powder is fine enough, it can pass through the rotating blades 33. The powder passing through the gaps of the rotating blades 33 is ejected upward from the space on the inner periphery of the rotating blades 33 and supplied to the interior of the exhaust guide 16. The gas mixed with powder supplied to the exhaust guide 16 is discharged from the exhaust port 41.

[0052] If the powder is too large to pass through the gap of the rotating blades 33, it falls due to its own weight into the upward opening formed on the coarse powder return guide 11. The coarse powder falls again from the lower end of the coarse powder return guide 11 to the center of the upper surface of the rotating table 5, where it is crushed again by the crushing roller 6.

[0053] A bag filter (not shown) and an exhaust fan are connected to the exhaust port 41. Clinker and by-product powder are collected through the bag filter and shipped as finished cement. Alternatively, a propulsion fan can be installed upstream of the inlet 71 instead of an exhaust fan.

[0054] Multiple fixed blades 14 are oriented with an inclination relative to the circumferential direction. Furthermore, as the rotor 31 rotates, the rotating blade 33 moves along a circular trajectory immediately adjacent to the inner circumference of the fixed blades 14. This imparts a direction to the gas passing through in the sequence of fixed blades 14 and rotating blades 33. Figure 1 The thick arrow points in the direction of the swirling flow component. Thus, the gas mixed with powder flows spirally from the interior of rotor 31 into the interior of exhaust guide 16.

[0055] The exhaust guide 16 has this characteristic shape to smoothly discharge gas with swirling components from the exhaust port 41. The following mainly refers to... Figures 2 to 4 Detailed description of exhaust guide 16.

[0056] The exhaust guide 16 includes a hollow housing 42. An annular opening 43 is formed at the bottom of the housing 42. Gas mixed with powder flows into the interior of the housing 42 from the separator 15 at the bottom through this opening 43.

[0057] A cylindrical portion (core) 44 is fixed to approximately the central portion of the housing 42. The cylindrical portion 44 defines the inner circumference of the swirling gas flow channel in the housing 42.

[0058] The cylindrical portion 44 is configured such that its axis faces vertically. The center of the cylindrical portion 44 coincides with the center of the annular opening 43. The upper and lower sides of the cylindrical portion 44 are open. Although in Figure 2 The drive shaft 35 is omitted hereafter, but it passes through the interior of the cylindrical section 44. The central axis of the cylindrical section 44 is aligned with the rotation axis of the rotor 31 in the separator 15.

[0059] like Figure 2 As shown, when viewed from above, the outer periphery of the housing 42 has a first portion 45a with a fixed diameter, a second portion (curved portion) 45b whose diameter increases in the circumferential direction as it approaches the exhaust port 41, and a straight third portion (straight portion) 45c that is connected to the end of the second portion 45b.

[0060] The first part 45a corresponds to the upstream portion of the gas flow path in the exhaust guide 16. Since the diameter of the housing 42 is constant in the first part 45a, the distance between the cylindrical portion 44 and the sidewall of the outer periphery of the housing 42 is substantially constant. In the first part 45a, the outline of the outer periphery of the opening 43, when viewed from above, substantially coincides with the outline of the outer periphery of the housing 42.

[0061] In the region corresponding to the first part 45a, a spiral guide (guide section) 46 is fixed between the cylindrical part 44 and the housing 42. The spiral guide 46 is formed in a spiral shape, becoming upward as the phase changes, with the phase changing towards the downstream side of the gas flow channel in the exhaust guide 16. The upper end of the spiral guide 46 is connected to the lower side of the upper wall of the housing 42. The spiral guide 46 can guide the gas near the upstream end of the gas flow channel entering the exhaust guide 16 from the opening 43 to smoothly swirl and flow within the housing 42.

[0062] The second part 45b corresponds to the middle portion of the gas flow channel in the exhaust guide 16. In the second part 45b, the diameter of the housing 42 increases smoothly towards the circumferential side (the downstream side of the flow channel). Thus, the second part 45b appears vortex-shaped when viewed from above.

[0063] In the second part 45b, the distance between the cylindrical portion 44 and the outer periphery of the shell 42 gradually increases as it moves downstream. As a result, the cross-sectional area of ​​the flow channel increases as it moves downstream. In addition, the centerline of the flow channel, viewed from above, becomes a vortex shape that changes in a manner that separates from the center of the cylindrical portion 44 as it moves downstream.

[0064] The lower end of the second part 45b of the housing 42 is closed between the opening 43 and the edge of the opening 43 by a sealing plate 47. The center of the annular opening 43 coincides with the center of the cylindrical part 44. By using the sealing plate 47 to seal the portion of the housing 42 (second part 45b) extending outward and the edge of the opening 43, gas leakage from the lower part of the housing 42 can be prevented.

[0065] The third part 45c corresponds to the downstream portion of the gas flow path in the exhaust guide 16. The third part 45c is connected tangentially to the end of the curved (arc-shaped) second part 45b.

[0066] The straight flow channel corresponding to the third part 45c is curved in a way that slopes upwards midway along its length. The exhaust port 41 is formed at the end of the downstream part.

[0067] The straight flow channel corresponding to part 45c is formed with a rectangular cross-section. For example... Figure 3 As shown, from a top view, the centerline 48 of the flow channel is offset to one side relative to the center of the cylindrical portion 44. The flow channel in the third part 45c can also be formed with a circular cross-section.

[0068] In the aforementioned structure, gas is introduced into the interior of the housing 42 through opening 43 (first step). Specifically, the gas flows spirally through opening 43 into the space corresponding to either the first portion 45a or the second portion 45b. The gas flows along the second portion 45b, that is, along a vortex-like portion where the diameter of the outer periphery of the housing 42 increases as it moves downstream. Since the cross-sectional area of ​​the flow channel only increases by the diameter and does not impede swirling, it is unlikely to cause deviations in the airflow velocity. The gas flows sequentially along the second portion 45b and the third portion 45c (second step). The diameter of the second portion 45b is set in such a way that the flow velocity does not increase even when it merges with gas from below as it moves downstream. Since the second portion 45b and the third portion 45c are connected tangentially, almost no airflow turbulence is generated at the connection point. Then, the gas is discharged obliquely upwards from the exhaust port 41 (third step).

[0069] By using the exhaust guide 16 with this structure, pressure loss during airflow can be effectively suppressed. This allows for energy savings, for example, for the air supply fan located downstream of the exhaust guide 16. Furthermore, since airflow velocity deviation (in other words, airflow turbulence) is suppressed, it prevents powder from impacting the inner wall of the housing 42 with excessive force. As a result, wear inside the housing 42 can be reduced.

[0070] Figure 5 as well as Figure 6 The results of the velocity distribution of exhaust ports 41 and 41z obtained by numerical fluid dynamics simulation analysis of the exhaust guide 16z of the comparative example and the exhaust guide 16 of this embodiment are shown respectively.

[0071] A brief description of the comparative example exhaust guide 16z is provided. In the comparative example exhaust guide 16z, the centerline of the straight flow channel toward the exhaust port 41z is arranged in a manner that does not deviate from the center of the cylindrical portion 44z disposed inside the housing 42z. The housing 42z does not have the spiral-shaped second portion 45b as shown in the described embodiment. The straight flow channel toward the exhaust port 41z is not tangentially connected to the outer periphery of the housing 42z, but rather radially connected to the housing 42z.

[0072] In each exhaust port 41, 41z, the portion with a flow velocity exceeding a predetermined value is indicated by a shaded line. In the comparative example exhaust guide 16z, it can be seen that at exhaust port 41z, the portion with increased flow velocity is distributed over a wide range, with the portion near the outer periphery of the gas swirling direction (AB side) having a particularly high flow velocity. On the other hand, in the exhaust guide 16 of this embodiment, it can be seen that the generation of the velocity-increased portion is effectively suppressed in exhaust port 41.

[0073] As explained above, the exhaust guide 16 of this embodiment is used in a vertical pulverizer 1 having a separator 15 that classifies powder by a rotor 31, to exhaust gas mixed with powder. The exhaust guide 16 includes a housing 42 and a cylindrical portion 44. A gas flow channel is formed inside the housing 42. The cylindrical portion 44 is disposed inside the housing 42. An opening 43 for introducing gas from below into the interior of the housing 42 is formed on the housing 42. The outer periphery of the housing 42 has a curved second portion 45b and a straight third portion 45c. The third portion 45c is connected to the second portion 45b in the tangential direction. Viewed from above, the centerline 48 of the gas flow channel corresponding to the third portion 45c is offset relative to the center of the cylindrical portion 44. An exhaust port 41 for discharging gas is formed at the end of the gas flow channel corresponding to the third portion 45c.

[0074] Therefore, since the introduced gas rises and swirls while being discharged from the exhaust port 41 in a manner that does not impede its swirling motion, deviations in the airflow velocity near the exhaust port 41 are particularly effective in suppressing these deviations. As a result, pressure loss in the exhaust guide 16 is effectively reduced, leading to energy savings. Furthermore, the exhaust guide 16 exhibits good durability because it suppresses uneven wear on its inner wall.

[0075] Furthermore, in the exhaust guide 16 of this embodiment, the second part 45b is formed in a vortex shape such that the distance from the center of the cylindrical part 44 increases as it approaches the third part 45c in the circumferential direction.

[0076] Therefore, since the swirling flow flows smoothly inside the housing 42, pressure loss can be further reduced.

[0077] In addition, the exhaust guide 16 of this embodiment has a sealing plate 47 that seals the lower side of the housing 42 between the second portion 45b of the outer periphery of the housing 42 and the edge of the opening 43.

[0078] Therefore, in the vortex-shaped portion of the second part 45b, airflow leakage from the lower part of the housing 42 can be prevented.

[0079] Additionally, the exhaust guide 16 of this embodiment has a spiral guide 46. The spiral guide 46 is disposed on the upper side of at least a portion of the swirling gas flow path from the opening 43 to the outlet 41.

[0080] Thus, the gas that has been introduced into the housing 42 shortly after passing through the opening 43 can be guided in a smooth manner along the swirling gas flow channel.

[0081] The vertical pulverizer 1 of this embodiment includes an exhaust guide 16 and a separator 15. The separator 15 classifies the powder by means of a rotor 31.

[0082] This allows the gas mixed with the graded powder to be smoothly discharged from the exhaust port 41.

[0083] The preferred embodiments of this disclosure have been described above, but the structure may be modified, for example, as follows.

[0084] The sealing plate 47 can also be configured to be inclined. The direction of inclination can be arbitrary; for example, the sealing plate 47 can be inclined downwards as it approaches the opening 43. Because the sealing plate 47 is inclined, powder is less likely to accumulate on top of the sealing plate 47, thus improving maintainability.

[0085] Alternatively, the second part 45b may not be formed in a vortex shape, but rather in the same manner as the first part 45a, with a fixed diameter.

[0086] Alternatively, the first part 45a may not be formed with a fixed diameter, but rather with the same vortex-like topography as the second part 45b.

[0087] Alternatively, instead of the cylindrical portion 44, a rod-shaped column portion may be disposed inside the housing 42.

[0088] The spiral guide 46 can also be omitted. The same effect can be achieved by forming the upper wall of the housing 42 into a spiral shape as a guide.

[0089] The lower end of the feed chute 12 may not be connected to the middle part of the coarse powder return guide 11. In this case, the clinker and auxiliary raw materials fed into the feed port 13 fall directly onto the rotary table 5 from the lower end of the feed chute 12.

[0090] In the described embodiment, the vertical crusher 1 is positioned such that the rotor 31 rotates in the same direction. Figure 1 The vertical pulverizer 1 can be configured in the direction of the thick arrow. However, the rotation direction of the rotor 31 can also be opposite to the stated direction.

Claims

1. An exhaust guide for use in a vertical pulverizer having a separator that classifies powders by a rotor, for discharging gas mixed with powder, characterized in that, include: The shell, with gas flow channels formed inside; and The core, which is disposed inside the housing, An opening is formed on the housing for introducing gas from below into the interior of the housing. The outer periphery of the shell has a curved portion and a straight portion, the straight portion being connected to the curved portion in the tangential direction, and the curved portion being a vortex-shaped portion whose distance from the center of the core increases circumferentially as it approaches the straight portion. Viewed from above, the centerline of the gas flow channel corresponding to the straight section is offset relative to the center of the core. An exhaust port for discharging gas is formed at the end of the gas flow channel corresponding to the straight section.

2. The exhaust guide according to claim 1, characterized in that, It has a sealing plate that closes the lower side of the housing between the vortex-shaped portion of the outer periphery of the housing and the edge of the opening.

3. The exhaust guide according to claim 2, characterized in that, The sealing plate is tilted.

4. The exhaust guide according to claim 1, characterized in that, It has a spiral guide portion disposed on the upper side of at least a portion of the spiral gas flow channel from the opening to the exhaust port.

5. A vertical pulverizer, characterized in that, have: The exhaust guide according to any one of claims 1 to 4; and The separator classifies the powder using the rotor.

6. A method for venting gas mixed with powder in a vertical pulverizer having a separator that classifies powder by a rotor, characterized in that, The vertical pulverizer has the following features: The shell, with gas flow channels formed inside; and The core, which is disposed inside the housing, An opening is formed on the housing for introducing gas from below into the interior of the housing. The outer periphery of the shell has a curved portion and a straight portion, the straight portion being connected to the curved portion in the tangential direction, and the curved portion being a vortex-shaped portion whose distance from the center of the core increases circumferentially as it approaches the straight portion. Viewed from above, the centerline of the gas flow channel corresponding to the straight section is offset relative to the center of the core. The exhaust method includes the following steps: In the first step, gas is introduced into the interior of the housing through the opening; In the second step, the gas inside the shell is made to flow sequentially along the curved portion and the straight portion. as well as In the third step, the gas flowing along the straight section is discharged from the exhaust port.

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