Adjustable nozzle ring for air outlet and coal mill

Abstract

This utility model belongs to the field of coal mill technology, and discloses an adjustable nozzle ring for air inlets and a coal mill. The adjustable nozzle ring has several air inlets arranged circumferentially on the nozzle ring, and several adjustable baffles are disposed on the nozzle ring. The positions of the adjustable baffles are adjustable and used to block the air inlets, thereby changing the ventilation area of ​​any air inlet. This utility model, through the adjustable baffles that can block the air inlets, eliminates the need to replace the nozzle ring when excessive wear affects the inlet air velocity. By adjusting the position of the adjustable baffles, the ventilation area of ​​the air inlets can be changed, thereby altering the inlet air velocity at the nozzle ring and keeping it within a set value. This reduces the problem of excessive coal dust emissions, improves the overall operating efficiency of the unit, and lowers the operating cost of coal dust disposal. Furthermore, the adjustable baffles can change the ventilation area of ​​any air inlet, thus achieving multiple adjustment schemes.

Description

Technical Field

[0001] This utility model relates to the field of coal mill technology, and in particular to an adjustable nozzle ring for air inlet and a coal mill. Background Technology

[0002] In coal mill equipment, especially medium-speed coal mills, the nozzle ring is a crucial component. Its main functions include guiding and accelerating hot air to carry pulverized coal into the mill's grinding zone, as well as participating in the drying, separation, and conveying of the pulverized coal. Specifically, pulverized coal moves upwards within the mill through the high-speed airflow from the nozzle ring, passing through the mill's grinding components for subsequent separation and drying. The nozzle ring provides the power for conveying the pulverized coal and allows it to suspend after grinding, facilitating subsequent separation and drying processes. Therefore, the nozzle ring performs multiple functions in the coal mill, including airflow guidance, pulverized coal drying, coarse-fine separation, and power transmission. Its performance directly affects the mill's output, pulverized coal fineness, energy consumption, and reliability.

[0003] In actual operation, the longer the medium-speed coal mill runs, the more wear on the nozzle rings will gradually increase, and the lower the air velocity at the nozzle rings will be. This means that coarser raw coal particles cannot be carried away, causing raw coal to fall into the stone and coal chamber. As a result, the emission of stone and coal from the medium-speed coal mill exceeds the standard value. This problem can only be solved by replacing the nozzle rings. However, replacing the nozzle rings is cumbersome and time-consuming, which will reduce operating efficiency.

[0004] Therefore, how to avoid replacing the nozzle ring and adjust the air inlet area of ​​the nozzle ring so that the air velocity at the nozzle ring is always kept within the set value, thereby reducing the problem of excessive emissions of gravel and coal, improving the overall operating efficiency of the unit, and reducing the operating cost of gravel and coal disposal, is a problem that needs to be solved by those in this field. Utility Model Content

[0005] The purpose of this utility model is to provide an adjustable nozzle ring and a coal mill, so as to avoid replacing the nozzle ring and adjust the air inlet area of ​​the nozzle ring so that the air velocity at the nozzle ring is always kept within the set value, thereby reducing the problem of excessive emissions of gravel and coal, improving the overall operating efficiency of the unit, and reducing the operating cost of gravel and coal disposal.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] An adjustable nozzle ring for the air vent, comprising:

[0008] Nozzle ring, which has several air outlets arranged circumferentially on its surface;

[0009] An adjustable baffle, several of which are disposed on the nozzle ring, and the position of the adjustable baffle is adjustable on the nozzle ring, for blocking the air outlet to change the ventilation area of ​​any of the air outlets.

[0010] Alternatively, several of the adjustable baffles may be arranged circumferentially along the nozzle ring.

[0011] Alternatively, the adjustable baffles are arranged in pairs, with each pair of adjustable baffles corresponding to one air vent.

[0012] Alternatively, each pair of adjustable baffles may be provided on both sides of the air vent.

[0013] Optionally, when the two adjustable baffles on both sides of the air vent move toward each other, the ventilation area of ​​the air vent decreases; when the two adjustable baffles on both sides of the air vent move away from each other, the ventilation area of ​​the air vent increases.

[0014] Alternatively, the adjustable baffle may be detachably connected to the nozzle ring.

[0015] Optionally, it also includes a fixing member, by which the adjustable baffle is fixed to the nozzle ring.

[0016] Alternatively, each of the adjustable baffles may be provided with at least two of the fasteners.

[0017] Alternatively, the fastener may be a bolt.

[0018] A coal mill, including an adjustable nozzle ring for the air inlet to change the air inlet area.

[0019] The beneficial effects of this utility model are:

[0020] This invention features an adjustable baffle on the nozzle ring, capable of blocking the air vents. This eliminates the need to replace the nozzle ring when excessive wear affects the inlet air velocity. By adjusting the position of the adjustable baffle, the ventilation area of ​​the air vents can be altered, thereby changing the inlet air velocity at the nozzle ring and maintaining it within a set value. This reduces excessive emissions of coal dust and improves the overall operating efficiency of the unit, lowering the operating costs of coal dust disposal. Furthermore, several adjustable baffles are provided, each capable of changing the ventilation area of ​​any given air vent, allowing for one-to-one adjustments to each vent as needed, providing multiple adjustment solutions. Attached Figure Description

[0021] Figure 1 This is a top view schematic diagram of the adjustable nozzle ring of the air outlet according to an embodiment of the present utility model;

[0022] Figure 2This is a partial cross-sectional schematic diagram of the adjustable nozzle ring of the air outlet described in this embodiment of the utility model.

[0023] In the picture:

[0024] 100 - Nozzle ring; 101 - Air outlet; 10 - Adjustable baffle; 20 - Fixing component. Detailed Implementation

[0025] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar parts or parts having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0026] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0028] The technical solution of this embodiment will be further described below with reference to the accompanying drawings and specific implementation methods.

[0029] like Figures 1-2 As shown, this embodiment provides an adjustable nozzle ring and a coal mill. The adjustable nozzle ring includes a nozzle ring 100 and an adjustable baffle 10. A plurality of air vents 101 are arranged circumferentially on the nozzle ring 100, and a plurality of adjustable baffles 10 are arranged on the nozzle ring 100. The position of the adjustable baffles 10 is adjustable on the nozzle ring 100 to block the air vents 101, thereby changing the ventilation area of ​​any air vent 101.

[0030] The coal mill includes an adjustable nozzle ring at the air inlet to change the air intake area.

[0031] Specifically, in this embodiment, an adjustable baffle 10 is provided on the nozzle ring 100, which can block the air vent 101. Therefore, when the nozzle ring 100 is excessively worn and affects the inlet air velocity, there is no need to replace the nozzle ring 100. By adjusting the position of the adjustable baffle 10, the ventilation area of ​​the air vent 101 can be changed, thereby altering the inlet air velocity at the nozzle ring 100 and keeping it within a set value. This reduces the problem of excessive coal and stone emissions, improves the overall operating efficiency of the unit, and lowers the operating cost of coal and stone disposal. Accordingly, several adjustable baffles 10 are provided, and each can change the ventilation area of ​​any air vent 101, allowing for one-to-one adjustment of the air vent 101 as needed, achieving multiple adjustment solutions.

[0032] The specific structure of the adjustable nozzle ring at the air outlet in this embodiment is described below.

[0033] like Figure 1 and Figure 2 As shown, the adjustable nozzle ring in this embodiment includes a nozzle ring 100, an adjustable baffle 10, and a fixing member 20. Specifically, the nozzle ring 100 is configured as an annular structure, and a plurality of air vents 101 are arranged around the circumference of the nozzle ring 100 to provide high-speed airflow to the coal powder in the coal mill, ensuring the conveying, drying, and separation of the coal powder. Specifically, the air vents 101 are arranged through the nozzle ring 100 along its axial direction. Exemplarily, in this embodiment, a plurality of air vents 101 are evenly arranged around the circumference of the nozzle ring 100 to ensure stable airflow and stable suspension of the coal powder, so that it can smoothly enter the separation and drying operation stages.

[0034] Furthermore, in this embodiment, several adjustable baffles 10 are also provided, and all of the adjustable baffles 10 are provided on the nozzle ring 100 to block the air vents 101 and change the ventilation area of ​​any air vent 101, thereby changing the overall air intake area of ​​the nozzle ring 100, so that the ventilation area and ventilation speed are controllable, thereby ensuring that the wind speed at the nozzle ring 100 is always kept within the set value, thereby effectively reducing the amount of stone coal emitted, thereby improving the efficiency of the unit and reducing the operating cost of handling stone coal.

[0035] Optionally, in this embodiment, the adjustable baffle 10 is adjustablely positioned on the nozzle ring 100, thereby allowing adjustment of the ventilation area of ​​the air outlet 101. Specifically, several adjustable baffles 10 are arranged circumferentially along the nozzle ring 100. Figure 1As shown, the adjustable baffles 10 and the nozzle rings 100 are arranged alternately. Furthermore, in this embodiment, the adjustable baffles 10 are arranged in pairs, and each pair of adjustable baffles 10 corresponds one-to-one with an air outlet 101. That is, each air outlet 101 is provided with a pair of adjustable baffles 10, thereby allowing for individual adjustment of the ventilation area of ​​each air outlet 101, achieving differentiated control to control the air intake area and air intake speed to meet requirements.

[0036] For example, in this embodiment, each pair of adjustable baffles 10 is respectively disposed on both sides of the air outlet 101, that is, each air outlet 101 is provided with one adjustable baffle 10 on each side of the nozzle ring 100 along its circumference, thereby changing the ventilation area of ​​the air outlet 101 through the two adjustable baffles 10. Specifically, when the two adjustable baffles 10 on both sides of the air outlet 101 move towards each other, the ventilation area of ​​the air outlet 101 decreases; when the two adjustable baffles 10 on both sides of the air outlet 101 move away from each other, the ventilation area of ​​the air outlet 101 increases. Thus, the ventilation area of ​​any air outlet 101 can be arbitrarily adjusted as needed until the ventilation speed meets the requirements. For example, in this embodiment, the nozzle ring 100 is evenly distributed with 8 air outlets 101 along its circumference, and correspondingly, 16 adjustable baffles 10 are disposed between the 8 air outlets 101.

[0037] Optionally, in this embodiment, the adjustable baffle 10 is detachably connected to the nozzle ring 100 to achieve quick disassembly and assembly, allowing for timely installation of the adjustable baffle 10 when wear occurs on the nozzle ring 100. Specifically, in this embodiment, the adjustable baffle 10 can be fixed to the nozzle ring 100 by the fixing member 20, thereby ensuring that the adjustable baffle 10 remains stable after determining the position of the air vent 101, resulting in a more stable ventilation effect. For example, each adjustable baffle 10 is provided with at least two fixing members 20 to perform multi-point positioning of the adjustable baffle 10, preventing the adjustable baffle 10 from moving during ventilation, changing the ventilation area, and affecting the air intake speed.

[0038] For example, the fixing member 20 is a bolt, which passes through the adjustable baffle 10 and the nozzle ring 100 in sequence to stably connect the two. Optionally, the fixing member 20 and the nozzle ring 100 are screwed together to ensure the stable installation of the adjustable baffle 10. Further, the two fixing members 20 are spaced apart and arranged along the circumference of the nozzle ring 100 to prevent the position of the adjustable baffle 10 from changing.

[0039] like Figure 2As shown, in this embodiment, each air vent 101 has two adjustable baffles 10 corresponding to it, both disposed on the top of the nozzle ring 100. Along the axial direction of the nozzle ring 100, the thickness of the adjustable baffle 10 is less than the thickness of the nozzle ring 100. For example, the two adjustable baffles 10 can completely cover the air vent 101, thereby completely closing the air vent 101. Correspondingly, the two adjustable baffles 10 can also completely open the air vent 101 to ensure maximum air intake area. Figure 1 As shown, in this embodiment, along the radial direction of the nozzle ring 100, the length of the adjustable baffle 10 is less than or equal to the length of the air outlet 101, so that the air outlet 101 can be partially or completely blocked. The specific dimensions can be set as needed, and will not be described in detail here.

[0040] In summary, the adjustable baffle 10 at each air vent 101 allows for setting different ventilation areas for different air vents 101, providing greater flexibility in adjustment. Furthermore, the adjustable baffle 10, with the help of the fixing component 20, can be disassembled and stably installed on the nozzle ring 100 to fix its position and facilitate disassembly and maintenance. Therefore, there is no need to replace the nozzle ring 100. By adjusting the position of the adjustable baffle 10 at any air vent 101, the ventilation area of ​​the air vent 101 can be changed, thereby altering the overall air intake area of ​​the nozzle ring 100. This ensures that the wind speed at the nozzle ring 100 remains within the set value, reducing the amount of coal dust emitted, improving overall operational efficiency, and lowering the operating costs of handling coal dust.

[0041] On the other hand, the coal mill, including the aforementioned adjustable nozzle ring, changes its air inlet area to ensure that pulverized coal can be transported in a stable airflow, improving operating efficiency while preventing coarser raw coal particles from falling into the stone coal chamber.

[0042] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An adjustable nozzle ring for air vents, characterized in that, include: A nozzle ring (100) is provided with a plurality of air outlets (101) along the circumferential direction. Adjustable baffles (10), a plurality of the adjustable baffles (10) are disposed on the nozzle ring (100), and the position of the adjustable baffles (10) is adjustablely disposed on the nozzle ring (100) for blocking the air vents (101) to change the ventilation area of ​​any of the air vents (101); The adjustable baffles (10) are arranged in pairs, and each pair of adjustable baffles (10) corresponds one-to-one with the air vent (101); Each pair of adjustable baffles (10) is respectively disposed on both sides of the air outlet (101); When the two adjustable baffles (10) on both sides of the air vent (101) move toward each other, the ventilation area of ​​the air vent (101) decreases; when the two adjustable baffles (10) on both sides of the air vent (101) move away from each other, the ventilation area of ​​the air vent (101) increases.

2. The adjustable nozzle ring for air vents according to claim 1, characterized in that, Several of the adjustable baffles (10) are arranged circumferentially along the nozzle ring (100).

3. The adjustable nozzle ring for air vents according to claim 1, characterized in that, The adjustable baffle (10) is detachably connected to the nozzle ring (100).

4. The adjustable nozzle ring for air vents according to claim 1, characterized in that, It also includes a fixing member (20), the adjustable baffle (10) being fixed to the nozzle ring (100) by the fixing member (20).

5. The adjustable nozzle ring for air vents according to claim 4, characterized in that, At least two of the fixing elements (20) are provided on each of the adjustable baffles (10).

6. The adjustable nozzle ring for air vents according to claim 4, characterized in that, The fastener (20) is a bolt.

7. A coal mill, characterized in that, Includes the adjustable nozzle ring for air inlet as described in any one of claims 1-6, to change the air inlet area.

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