Dynamic and static ring device of medium-speed roller type coal mill

Abstract

The invention provides a dynamic and static ring device of a medium-speed roller type coal mill. The dynamic and static ring device comprises a static ring unit and a dynamic ring unit, the static ring unit comprises a base, a first fixing bolt and a cover plate. The annular base is fixed to the inner side wall of a barrel of the coal mill. The first fixing bolt penetrates through a bolt hole in the cover plate and fixes the cover plate above the base, and the inner side wall of the cover plate protrudes out of the inner side wall of the base; the annular moving ring unit is arranged on the inner side of the base, and the moving ring unit is located below the cover plate. A first gap distributed in the vertical direction is formed between the movable ring unit and the base, a second gap distributed in the horizontal direction is formed between the movable ring unit and the cover plate, and the first gap and the second gap are communicated and form an L-shaped structure. The coal mill has the technical effects that the impact force of pulverized coal carried by high-speed airflow on the inner side wall of the barrel can be reduced, and safe and stable operation of the coal mill is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of coal-fired power station pulverizing equipment, and in particular relates to a dynamic and static ring device of a medium-speed roller coal mill. Background Art

[0002] Medium-speed roller mills are core equipment in the pulverizing systems of modern coal-fired power plants. Their air ring structure directly impacts pulverization efficiency and operational reliability. Traditional air ring systems consist of a stationary ring and a rotating ring. Primary air flows through the annular air duct, creating an upward flow carrying pulverized coal. However, severe wear of the outer cylinder of medium-speed roller mills is a common problem during unit operation. Severe wear of the outer cylinder poses a risk of pulverized coal leakage, impacting safe and stable production. Leakage caused by outer cylinder wear requires mill shutdown and maintenance, increasing maintenance workload and costs, reducing boiler load capacity, and impacting normal power generation. Conventional vertical gaps between the rotating and static rings create chaotic vortices when high-speed air flows through this gap, severely disrupting the stability of the wind field above the millstones. The high-speed airflow, carrying pulverized coal particles, continuously impacts the outer cylinder, causing localized wear and affecting safe and stable operation. Furthermore, conventional rectangular-section air rings have a high drag coefficient, making them unsuitable for reducing pulverized coal consumption.

[0003] Therefore, there is an urgent need for a new type of dynamic and static ring device that can simultaneously optimize the wind field structure, reduce wear and reduce energy consumption. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art and provides a new technical solution for the dynamic and static ring devices of a medium-speed roller coal mill.

[0005] According to one aspect of the present invention, a dynamic and static ring device for a medium-speed roller coal mill is provided, comprising:

[0006] The stationary ring unit includes a base, a first fixing bolt, and a cover plate. The annular base is fixed to the inner side wall of the cylinder of the coal mill. The first fixing bolt passes through the bolt hole on the cover plate and fixes the cover plate above the base, and the inner side wall of the cover plate protrudes from the inner side wall of the base.

[0007] A dynamic ring unit, the ring-shaped dynamic ring unit is arranged on the inner side of the base, and the dynamic ring unit is located below the cover plate;

[0008] A first gap distributed in the vertical direction is formed between the dynamic ring unit and the base, and a second gap distributed in the horizontal direction is formed between the dynamic ring unit and the cover plate. The first gap and the second gap are connected to form an L-shaped structure.

[0009] Optionally, the stationary ring unit further includes a sealing round steel, the annular sealing round steel is arranged above the cover plate, and the sealing round steel seals the gap between the cover plate and the cylinder of the coal mill.

[0010] Optionally, the length of the first gap is 6-10 mm.

[0011] Optionally, the length of the second gap is 3-8 mm.

[0012] Optionally, the dynamic and static ring device of the medium-speed roller coal mill further includes a second fixing bolt;

[0013] The dynamic ring unit is fixed to the grinding disc of the coal mill through the second fixing bolts.

[0014] Optionally, the dynamic ring unit is provided with blowing holes distributed along the vertical direction.

[0015] Optionally, the dynamic ring unit is an airfoil-shaped wind ring.

[0016] Optionally, the outer side wall of the dynamic ring unit is an arc-shaped structure extending from the inner side to the inner side wall of the cylinder from top to bottom.

[0017] Optionally, the material of the dynamic ring unit is ZG50Mn2.

[0018] Optionally, the base is welded to the inner wall of the cylinder of the coal mill.

[0019] A technical effect of the present invention is:

[0020] In an embodiment of the present application, a first gap distributed along the vertical direction is formed between the dynamic ring unit and the base, and a second gap distributed along the horizontal direction is formed between the dynamic ring unit and the cover plate. The first gap and the second gap are connected and form an L-shaped structure, thereby forming a horizontal gap between the dynamic ring unit and the static ring unit, reducing the impact of the bypass air volume on the wind field, and at the same time reducing the impact force of the high-speed airflow carrying coal powder on the inner wall of the cylinder, thereby ensuring the safe and stable operation of the coal mill. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The present invention is a schematic structural diagram of a dynamic and static ring device of a medium-speed roller coal mill according to an embodiment of the present invention.

[0022] In the figure: 1. Sealing round steel; 2. Cover plate; 3. First fixing bolt; 4. Base; 5. Moving ring unit; 6. Second fixing bolt; 7. Grinding disc; 8. Inner wall of the cylinder. DETAILED DESCRIPTION

[0023] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0024] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0025] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly refer to one or more of the features. Throughout the description of this application, unless otherwise specified, "plurality" means two or more. Furthermore, "and / or" in the specification and claims refers to at least one of the connected entities, and the character " / " generally indicates an "or" relationship between the connected entities.

[0026] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0027] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0028] According to one aspect of the present invention, see Figure 1, provides a dynamic and static ring device for a medium-speed roller coal mill, which can solve the problem of severe wear of the inner wall 8 of the cylinder of the coal mill, improve the reliability of equipment operation, and ensure safe, economical and stable operation of the unit.

[0029] Specifically, the dynamic and static ring device of the medium-speed roller coal mill includes:

[0030] The stationary ring unit includes a base 4, a first fixing bolt 3, and a cover plate 2. The annular base 4 is fixed to the inner side wall 8 of the cylinder of the coal mill. The first fixing bolt 3 passes through the bolt hole on the cover plate 2 and fixes the cover plate 2 above the base 4. The inner side wall of the cover plate 2 protrudes from the inner side wall of the base 4.

[0031] The ring unit 5 is annular and is disposed on the inner side of the base 4 and is located below the cover 2.

[0032] A first gap distributed in the vertical direction is formed between the dynamic ring unit 5 and the base 4 , and a second gap distributed in the horizontal direction is formed between the dynamic ring unit 5 and the cover plate 2 . The first gap and the second gap are connected to form an L-shaped structure.

[0033] In the embodiment of the present application, a first gap distributed along the vertical direction is formed between the dynamic ring unit 5 and the base 4, and a second gap distributed along the horizontal direction is formed between the dynamic ring unit 5 and the cover plate 2. The first gap and the second gap are connected and form an L-shaped structure, thereby forming a horizontal gap between the dynamic ring unit 5 and the static ring unit, reducing the impact of the bypass air volume on the wind field, and at the same time reducing the impact force of the high-speed airflow carrying coal powder on the inner wall 8 of the cylinder, thereby ensuring the safe and stable operation of the coal mill.

[0034] Optionally, the stationary ring unit further includes a sealing round steel 1. The annular sealing round steel 1 is arranged above the cover plate 2, and the sealing round steel 1 seals the gap between the cover plate 2 and the cylinder of the coal mill.

[0035] In the above embodiment, the sealing round steel 1 can effectively seal the gap between the cover plate 2 and the cylinder of the coal mill, thereby effectively preventing the accumulation of coal powder.

[0036] It should be noted that a bypass air channel is formed between the outer wall of the dynamic ring unit 5 and the inner wall 8 of the cylinder, and the bypass air carrying the coal powder moves from bottom to top in the bypass air channel.

[0037] Optionally, the length of the first gap is 6-10 mm, which helps to achieve the vertical movement of the bypass air carrying the coal powder.

[0038] Optionally, the length of the second gap is 3-8 mm, which helps to achieve the horizontal movement of the bypass air carrying the coal powder.

[0039] Optionally, the dynamic and static ring device of the medium-speed roller coal mill further includes a second fixing bolt 6;

[0040] The dynamic ring unit 5 is fixed to the grinding disc 7 of the coal mill through the second fixing bolts 6 .

[0041] In the above embodiment, the second fixing bolts 6 can firmly fix the dynamic ring unit 5 to the grinding table 7 of the coal mill.

[0042] Optionally, the movable ring unit 5 is provided with vertically distributed blowing holes. The movable ring unit 5 forms an air ring through the blowing holes, which not only provides an air flow channel but also realizes the coal powder drying, transportation and classification in the coal grinding process.

[0043] Optionally, the dynamic ring unit 5 is an airfoil-shaped wind ring.

[0044] In the above embodiment, the airfoil-shaped wind ring is optimized for the flow-through portion of the dynamic ring unit 5 to reduce the upper and lower pressure differences of the dynamic ring unit 5 of the coal mill. This design has a stronger powder carrying capacity under the condition of the same mass flow of primary air, and can reduce the operating air volume of the coal mill, thereby solving the problem of severe wear of the inner side wall 8 of the cylinder of the coal mill.

[0045] Optionally, the outer wall of the dynamic ring unit 5 is in an arc-shaped structure extending from the inner side toward the inner wall 8 of the cylinder from top to bottom. This enables the dynamic ring unit 5 to form a rotating airflow environment to promote the drying, classification, and transportation of the pulverized coal, helping to improve the operating efficiency of the coal mill and the quality of the pulverized coal.

[0046] Optionally, the material of the dynamic ring unit 5 is ZG50Mn2, which can better ensure the strength of the dynamic ring unit 5.

[0047] Optionally, the base 4 is welded to the inner side wall 8 of the cylinder of the coal mill. This makes the connection between the base 4 and the inner side wall 8 of the cylinder more firm.

[0048] In the embodiments of the present application, the dynamic and static ring device of the medium-speed roller coal mill can effectively solve the technical problems of the existing air ring structure, such as large bypass air volume, severe cylinder wall wear, and high pressure difference energy consumption. It forms a horizontal gap through the L-shaped structure between the dynamic ring unit 5 and the static ring unit, reconstructing the current vertical airflow channel into an inverted L-shaped flow channel, effectively suppressing the impact of the bypass air volume on the flow field and the erosion of the inner wall 8 of the cylinder. At the same time, the dynamic ring unit 5 adopts an airfoil design to optimize the air ring cross-section, thereby reducing the resistance of the dynamic ring unit 5 and increasing the primary air's carrying rate of coal powder. Therefore, the dynamic and static ring device of the medium-speed roller coal mill solves the stubborn problems of wind field turbulence and wear in the coal mill, significantly improving the safety and economic efficiency of equipment operation.

[0049] It will be understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present invention, and the present invention is not limited thereto. Those skilled in the art will appreciate that various modifications and improvements can be made without departing from the spirit and substance of the present invention, and such modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A dynamic and static ring device for a medium-speed roller coal mill, characterized in that: include: The stationary ring unit includes a base, a first fixing bolt, and a cover plate. The annular base is fixed to the inner side wall of the cylinder of the coal mill. The first fixing bolt passes through the bolt hole on the cover plate and fixes the cover plate above the base, and the inner side wall of the cover plate protrudes from the inner side wall of the base. A dynamic ring unit, the ring-shaped dynamic ring unit is arranged on the inner side of the base, and the dynamic ring unit is located below the cover plate; A first gap distributed in the vertical direction is formed between the dynamic ring unit and the base, and a second gap distributed in the horizontal direction is formed between the dynamic ring unit and the cover plate. The first gap and the second gap are connected to form an L-shaped structure.

2. The dynamic and static ring device of the medium-speed roller mill according to claim 1, characterized in that: The stationary ring unit further includes a sealing round steel. The ring-shaped sealing round steel is arranged above the cover plate, and the sealing round steel seals the gap between the cover plate and the cylinder of the coal mill.

3. The dynamic and static ring device of the medium-speed roller coal mill according to claim 1, characterized in that: The length of the first gap is 6-10 mm.

4. The dynamic and static ring device of the medium-speed roller coal mill according to claim 1, characterized in that: The length of the second gap is 3-8 mm.

5. The dynamic and static ring device of the medium speed roller mill according to claim 1, characterized in that: Also included is a second fixing bolt; The dynamic ring unit is fixed to the grinding disc of the coal mill through the second fixing bolts.

6. The dynamic and static ring device of the medium-speed roller coal mill according to claim 1, characterized in that: The dynamic ring unit is provided with blowing holes distributed along the vertical direction.

7. The dynamic and static ring device of the medium-speed roller coal mill according to claim 6, characterized in that: The dynamic ring unit is an airfoil-shaped wind ring.

8. The dynamic and static ring device of the medium-speed roller coal mill according to claim 7, characterized in that: The outer side wall of the dynamic ring unit is in an arc-shaped structure extending from the inner side to the inner side wall of the cylinder from top to bottom.

9. The dynamic and static ring device of the medium-speed roller coal mill according to claim 1, characterized in that: The material of the dynamic ring unit is ZG50Mn2.

10. The dynamic and static ring device of the medium-speed roller coal mill according to claim 1, characterized in that: The base is welded to the inner side wall of the cylinder of the coal mill.

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