Coal mill cylinder diameter determination method based on flow guide distance optimization and coal mill
By optimizing the guide distance to determine the diameter of the coal mill cylinder, the problem of severe cylinder wear in traditional designs was solved, achieving stable operation of the coal mill and extending equipment life.
Patent Information
- Application Number
- CN202511318602.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-16
- Publication Date
- 2025-11-21
AI Technical Summary
Traditional medium-speed coal mill cylinder designs neglect airflow dynamics factors, resulting in severe cylinder wear, short equipment lifespan, and increased maintenance costs.
By optimizing the guide distance, the relationship between the diameter of the coal mill cylinder and the guide distance is determined. Using the threshold of the guide distance as a constraint, the cylinder diameter is reasonably designed to avoid the primary airflow carrying coal particles from impacting the inner wall of the cylinder, thus forming a stable laminar flow.
Significantly reduces cylinder wear, extends equipment lifespan, lowers maintenance costs, ensures stable operation of the coal mill, and improves grinding efficiency.
Smart Images
Figure CN120995940A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present disclosure relates to the technical field of coal chemical industry, and particularly relates to a mill barrel diameter determination method based on guide distance optimization and a mill. BACKGROUND
[0002] A medium-speed mill is a core equipment of a pulverizing system of a modern large-scale thermal power plant, and a barrel structure of the medium-speed mill has a vital influence on a coal powder grinding efficiency and a service life of the medium-speed mill. A main task of the medium-speed mill is to grind raw coal into coal powder with a fineness meeting a combustion requirement. Inside the mill, a barrel constitutes a peripheral structure of a grinding area, and is a key component for accommodating grinding components and a primary air-powder mixture. Barrel wear is one of the most common and most serious failure modes of the medium-speed mill during operation. For example, for a ZGM, MPS, and HP type medium-speed mill, barrel wear is mainly caused by a coal powder airflow scouring. A traditional design method has obvious defects. When a barrel diameter is designed, the traditional design method mainly depends on process parameters such as a ventilation volume and a grinding output, and there is a problem of short service life of the mill caused by barrel wear. SUMMARY
[0003] Embodiments of the present disclosure provide a mill barrel diameter determination method based on guide distance optimization and a mill, to solve the problem of short service life of the mill caused by barrel wear when a barrel diameter is designed according to process parameters such as a ventilation volume and a grinding output.
[0004] To solve the above problem, in a first aspect, a mill barrel diameter determination method based on guide distance optimization is provided, and the method comprises the following steps.
[0005] determining a relationship between a barrel diameter of the mill and a guide distance; wherein the guide distance is a distance between an inner edge of a static ring and an inner wall of an inner barrel guard plate; a gap is formed between the static ring and a dynamic ring, and the guide distance is used to avoid a primary air flow through the gap from carrying coal particles to impact the inner wall of the inner barrel guard plate;
[0006] determining the barrel diameter of the mill according to the relationship between the barrel diameter and the guide distance, with a threshold value of the guide distance as a constraint.
[0007] In combination with the first aspect, in a possible implementation manner, the determining of the relationship between the barrel diameter of the mill and the guide distance comprises the following steps.
[0008] obtaining an inner diameter of the static ring and a thickness of the inner barrel guard plate;
[0009] determining the relationship between the barrel diameter of the mill and the guide distance according to the inner diameter of the static ring and the thickness of the inner barrel guard plate.
[0010] With reference to the first aspect, in a possible implementation, the relationship between the mill barrel diameter and the guide distance of the coal mill is determined according to the static ring inner diameter and the thickness of the barrel inner shield, and the formula is as follows:
[0011] L = (b - 2c - a) / 2;
[0012] Wherein, L represents the guide distance, b represents the mill barrel diameter, c represents the thickness of the barrel inner shield, and a represents the static ring inner diameter.
[0013] With reference to the first aspect, in a possible implementation, the mill barrel diameter of the coal mill is determined according to the relationship between the mill barrel diameter and the guide distance, with the threshold value of the guide distance as a constraint, which includes:
[0014] The minimum value of the mill barrel diameter of the coal mill is determined according to the relationship between the mill barrel diameter and the guide distance, with the threshold value of the guide distance as a constraint, and the formula is as follows:
[0015] L = (b - 2c - a) / 2 ≥ X;
[0016] b ≥ b min = 2c + a + 2X;
[0017] Wherein, b min represents the minimum value of the mill barrel diameter, and X represents the threshold value of the guide distance.
[0018] With reference to the first aspect, in a possible implementation, the threshold value of the guide distance is 185 millimeters.
[0019] The second aspect provides a coal mill, which includes: a barrel, a barrel inner shield, a static ring and a dynamic ring.
[0020] The barrel inner shield is arranged on the inner wall of the barrel;
[0021] The static ring is arranged on the inner wall of the barrel inner shield;
[0022] The gap is formed between the static ring and the dynamic ring;
[0023] Wherein, the mill barrel diameter is determined based on the relationship between the mill barrel diameter and the guide distance of the coal mill, with the threshold value of the guide distance as a constraint; the guide distance is the distance between the inner edge of the static ring and the inner wall of the barrel inner shield; and the guide distance is used to avoid the coal particles carried by the primary air flow passing through the gap from impacting the inner wall of the barrel inner shield.
[0024] With reference to the second aspect, in a possible implementation, the relationship between the mill barrel diameter and the guide distance of the coal mill is determined based on the static ring inner diameter and the thickness of the barrel inner shield.
[0025] In combination with the second aspect, in a possible implementation, the relationship between the mill barrel diameter and the guide distance is determined based on the inner diameter of the static ring and the thickness of the barrel inner shield, and is expressed by a formula as follows:
[0026] L = (b - 2c - a) / 2;
[0027] wherein L represents the guide distance, b represents the mill barrel diameter, c represents the thickness of the barrel inner shield, and a represents the inner diameter of the static ring.
[0028] In combination with the second aspect, in a possible implementation, the mill barrel diameter is determined based on the relationship between the mill barrel diameter and the guide distance, with a threshold value of the guide distance as a constraint, and is expressed by a formula as follows:
[0029] L = (b - 2c - a) / 2 ≥ X;
[0030] b ≥ b min = 2c + a + 2X;
[0031] wherein b min represents the minimum value of the mill barrel diameter, and X represents the threshold value of the guide distance.
[0032] In combination with the second aspect, in a possible implementation, the threshold value of the guide distance is 185 mm.
[0033] The beneficial effects of the embodiments of the present disclosure include:
[0034] The mill barrel diameter determination method based on guide distance optimization and the mill provided by the embodiments of the present disclosure include: determining the relationship between the mill barrel diameter and the guide distance; wherein the guide distance is the distance between the inner edge of the static ring and the inner wall of the barrel inner shield; the gap is formed between the static ring and the dynamic ring, and the guide distance is used to avoid the primary air flow carrying the coal particles through the gap to impact the inner wall of the barrel inner shield; and the mill barrel diameter is determined according to the relationship between the mill barrel diameter and the guide distance, with a threshold value of the guide distance as a constraint. The mill barrel diameter determination method based on guide distance optimization provided by the embodiments of the present disclosure can ensure the formation of stable laminar flow of the airflow in the mill barrel, can greatly reduce the impact and collision probability of the coal particles on the inner wall of the barrel, and can further significantly reduce the barrel wear, effectively prolong the service life of the mill, and fundamentally reduce the maintenance and replacement cost of the equipment. The influence of the airflow dynamics on the structural wear is taken into account, the threshold value of the guide distance is used as a hard constraint, and the defects caused by the traditional design due to the neglect of the airflow dynamics factors are avoided. Moreover, the reasonable combination of the mill barrel diameter and the guide distance can stabilize the airflow state in the mill, reduce the fluctuation of the grinding efficiency caused by the airflow turbulence, and ensure the continuous and stable operation of the mill, thereby laying a solid foundation for the normal operation of the coal pulverizing system of the thermal power plant. BRIEF DESCRIPTION OF DRAWINGS
[0035] Figure 1 A flowchart of a method for determining a diameter of a cylinder of a coal mill based on a guide distance is provided for an embodiment of the present disclosure.
[0036] Figure 2 A structural schematic diagram of a coal mill is provided for an embodiment of the present disclosure.
[0037] Figure 3 A structural schematic diagram of a coal mill is provided for an embodiment of the present disclosure. DETAILED DESCRIPTION
[0038] Embodiments of the present disclosure provide a method for determining a diameter of a cylinder of a coal mill based on a guide distance and a coal mill. Preferred embodiments of the present disclosure are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present disclosure, and are not used to limit the present disclosure. In the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.
[0039] Embodiments of the present disclosure provide a method for determining a diameter of a cylinder of a coal mill based on a guide distance, as shown in Figure 1 , comprising:
[0040] S101, determining the relationship between the diameter of the cylinder of the coal mill and the guide distance; wherein the guide distance is the distance between the inner edge of the static ring and the inner wall of the inner shield plate of the cylinder; the gap is formed between the static ring and the dynamic ring, and the guide distance is used to avoid the impact of the coal particles carried by the primary air flow passing through the gap on the inner wall of the inner shield plate of the cylinder;
[0041] S102, taking the threshold value of the guide distance as a constraint, determining the diameter of the cylinder of the coal mill according to the relationship between the diameter of the cylinder and the guide distance.
[0042] In the embodiments of the present disclosure, the medium-speed coal mill is the core equipment of the modern large-scale thermal power plant pulverizing system, and the barrel structure has a crucial influence on the coal powder grinding efficiency and the equipment life. The main task of the medium-speed coal mill is to grind the raw coal into coal powder with a fineness meeting the combustion requirements, thereby providing high-quality fuel for the boiler of the thermal power plant. Inside the coal mill, the barrel constitutes the peripheral structure of the grinding area and is a key component for accommodating the grinding components and the primary air-powder mixture. The barrel not only provides a physical space for the grinding process, but also influences the grinding efficiency and uniformity of the coal powder through its structural design. However, barrel wear is one of the most common and severe failure modes during the operation of the medium-speed coal mill. Taking the common ZGM, MPS, and HP type medium-speed coal mills as examples, the barrel wear is mainly caused by the scouring of the coal powder gas flow. During the grinding process, the coal powder is mixed with the gas flow to form a high-speed gas-solid two-phase flow, which produces a strong scouring effect on the inner wall of the barrel. This scouring not only causes the wear of the barrel material, but also reduces the grinding efficiency, increases the maintenance cost and downtime of the equipment. The traditional design method has obvious defects in the design of the barrel of the medium-speed coal mill. When designing the barrel diameter, the process parameters such as the air volume and the grinding output are mainly considered, while the influence of barrel wear on the equipment life is ignored. For example, the air volume refers to the total amount of gas flow passing through the coal mill, usually measured in cubic meters per hour. The air volume directly affects the conveying efficiency of the coal powder. Sufficient air volume can ensure that the coal powder is smoothly conveyed from the coal mill to the separator and eventually into the coal powder bin. During the grinding process, the air volume also plays a role in drying the raw coal. Through the scouring of hot air, the moisture in the raw coal is evaporated, thereby improving the combustion efficiency of the coal powder. The grinding output refers to the amount of raw coal that the coal mill can grind per unit time, usually measured in tons per hour (t / h). The grinding output directly determines the production efficiency of the coal mill. A higher grinding output means that the coal mill can process more raw coal in a shorter time. Designing the coal mill based on process parameters such as air volume and grinding output can meet the requirements of grinding efficiency to some extent, but due to the lack of consideration of wear factors, the barrel wears quickly in actual operation, and the equipment life is short. This not only increases the maintenance cost of the equipment, but also may affect the normal operation of the thermal power plant.
[0043] In the embodiments of the present disclosure, as shown in Figure 2 and Figure 3 , a structure diagram of a coal mill is provided. Figure 2 , a structure diagram of a coal mill is provided. Figure 3 , a structure diagram of a coal mill is provided. Figure 2 and Figure 3 , a structure diagram of a coal mill is provided. Figure 3 , a structure diagram of a coal mill is provided. Figure 2 , a structure diagram of a coal mill is provided. Figure 2The cylinder 201, the inner cylinder liner 202, the static ring 203, the dynamic ring 204 and the gap 205. The coal mill includes the cylinder 201, the inner cylinder liner 202, the static ring 203 and the dynamic ring 204. The inner cylinder liner 202 is arranged on the inner wall of the cylinder 201. The static ring 203 is arranged on the inner cylinder liner 202. The gap 205 is formed between the static ring 203 and the dynamic ring 204. The cylinder 201 is the main structural component of the medium-speed coal mill, which constitutes the outer shell of the coal mill and provides a closed space for the grinding process. The cylinder 201 is internally installed with grinding components such as grinding plates and grinding rollers to provide physical space for the grinding process. The cylinder 201 can prevent coal powder from leaking out and protect the internal components from the external environment. At the same time, the cylinder 201, as the overall frame of the coal mill, bears various forces during the grinding process, including grinding force and impact force. The inner cylinder liner 202 is a protective layer installed inside the cylinder 201, usually made of wear-resistant materials, used to protect the cylinder from wear and tear. The main function of the inner cylinder liner 202 is to reduce the erosion and wear of the inner wall of the cylinder 201 by coal powder airflow, thereby prolonging the service life of the cylinder. The static ring 203 is a fixed component inside the medium-speed coal mill, usually installed on the inner cylinder liner 202 and located in the same plane as the grinding plate, corresponding to the dynamic ring 204. The dynamic ring 204 is a rotating component inside the medium-speed coal mill, installed on the circumference of the grinding plate. Moreover, the gap 205 is formed between the static ring 203 and the dynamic ring 204, located between the inner edge 206 of the static ring and the dynamic ring. Primary air mainly enters the inside of the cylinder 201 through the dynamic ring flow channel, and part of the primary air enters the inside of the cylinder 201 through the gap 205, forming a high-speed airflow that impacts and stirs the coal powder, assisting the grinding process. Primary air refers to the main combustion air directly sent into the combustion chamber or furnace, with the core function of transporting fuel into the furnace and providing oxygen required for the initial stage of fuel combustion. However, during the operation of the coal mill, the coal powder airflow forms a high-speed vortex between the inner cylinder liner 202 and the static ring 203. The airflow carries coal particles that continuously impact the inner wall 207 of the inner cylinder liner, and the airflow forms a turbulent vortex at the inner wall 207 of the inner cylinder liner, increasing the probability of centrifugal collision of coarse particles and accelerating the local wear rate of the inner cylinder liner 202. In order to reduce the wear of the coal powder airflow on the cylinder 201 and the inner cylinder liner 202, combined with airflow dynamics, a guide distance is proposed. The guide distance is the distance between the inner edge 206 of the static ring and the inner wall 207 of the inner cylinder liner. The guide distance is used to avoid the impact of the airflow entering from the gap 205 on the inner wall 207 of the inner cylinder liner, so that a suitable guide distance can effectively reduce the wear of the coal powder airflow on the cylinder 201 and the inner cylinder liner 202.
[0044] Further, the relationship between the cylinder diameter of the coal mill and the guide distance is determined. For example, by summarizing the geometric analysis of the structure of the coal mill and the actual operation data, the correlation between the cylinder diameter and the guide distance is established. Combined with the inner diameter of the static ring, the thickness of the inner shield plate of the cylinder and other parameters, the mathematical relationship between the cylinder diameter and the guide distance is derived. The threshold of the guide distance is determined based on long-term engineering monitoring, for example, the threshold of the guide distance is 185mm. The threshold of the guide distance is a key indicator to ensure that the airflow forms a stable laminar flow and reduces the wear of the cylinder. The optimization of the guide distance can refer to the threshold of the guide distance as a benchmark, which defines the lower limit of the value of the guide distance. Taking the threshold of the guide distance as a constraint, the cylinder diameter of the coal mill is determined according to the relationship between the cylinder diameter and the guide distance.
[0045] In the embodiments of the present application, by optimizing the guide distance, the stable laminar flow of the airflow in the cylinder is ensured, the probability of impact and collision of coal particles on the inner wall of the cylinder is reduced, the wear of the cylinder is significantly reduced, the service life of the coal mill is prolonged, and the equipment maintenance and replacement cost is reduced. The influence of gas dynamics on structural wear is considered in the design, and by taking the threshold of the guide distance as a constraint, the scientificity and accuracy of the design are improved, and the defects caused by ignoring the gas dynamics in the traditional design are avoided. The reasonable cylinder diameter and guide distance can stabilize the airflow state in the coal mill, reduce the fluctuation of grinding efficiency caused by airflow turbulence, and ensure the continuous and stable operation of the coal mill, which provides protection for the normal operation of the coal pulverizing system of the thermal power plant.
[0046] In another embodiment of the present disclosure, in the step S101, the relationship between the cylinder diameter of the coal mill and the guide distance is determined, including:
[0047] Step 1, obtaining the inner diameter of the static ring and the thickness of the inner shield plate of the cylinder;
[0048] Step 2, determining the relationship between the cylinder diameter of the coal mill and the guide distance according to the inner diameter of the static ring and the thickness of the inner shield plate of the cylinder.
[0049] In the embodiments of the present disclosure, the relationship between the diameter of the cylinder and the guide distance is established by obtaining two key structural parameters, the inner diameter of the static ring and the thickness of the inner shield plate of the cylinder. For step 1, the inner diameter of the static ring is one of the key parameters affecting the guide distance, as the static ring is an important component in the coal mill. The inner diameter of the static ring can be measured by measuring tools such as calipers, laser range finders, etc. For different types of medium-speed coal mills (such as ZGM, MPS, HP type), the specifications of the static ring are different, and accurate measurement is required for specific models. If the static ring is a standard part, the inner diameter of the static ring can also be obtained from the technical manual, but to ensure data accuracy, it is recommended to verify it by actual measurement. The inner shield plate of the cylinder is an important structure to protect the cylinder from wear, and its thickness directly affects the actual position of the inner wall of the cylinder, and then affects the guide distance. When measuring the inner shield plate of the cylinder, multiple positions of the inner shield plate of the cylinder can be selected for measurement, and the average value is taken to reduce errors. For step 2, the inner diameter of the static ring determines the position of the inner edge of the static ring, and the thickness of the inner shield plate of the cylinder changes the actual radius of the inner wall of the cylinder. By combining the inner diameter of the static ring and the thickness of the inner shield plate of the cylinder, the geometric relationship between the diameter of the cylinder and the guide distance can be derived. For example, the change of the diameter of the cylinder will cause the change of the position of the inner wall of the cylinder, and when the inner diameter of the static ring is fixed, the guide distance will change accordingly, and the mathematical relationship between the two can be established by geometric formula. By obtaining the key parameters of the inner diameter of the static ring and the thickness of the inner shield plate of the cylinder, and establishing the relationship between the diameter of the cylinder and the guide distance based on this, the model is more consistent with the actual structure of the coal mill, the errors caused by missing or inaccurate parameters are reduced, and the reliability of the relationship is improved.
[0050] In another embodiment of the present disclosure, in step 2, the relationship between the diameter of the cylinder of the coal mill and the guide distance is determined according to the inner diameter of the static ring and the thickness of the inner shield plate of the cylinder, and the formula is:
[0051] L=(b-2c-a) / 2;
[0052] Wherein, L represents the guide distance, b represents the diameter of the cylinder of the coal mill, c represents the thickness of the inner shield plate of the cylinder, and a represents the inner diameter of the static ring.
[0053] In the embodiments of the present disclosure, the guide distance L is related to the diameter b of the cylinder, the thickness c of the inner shield plate of the cylinder, and the inner diameter a of the static ring by the explicit mathematical formula L=(b-2c-a) / 2, which provides a precise and quantitative calculation method for determining the relationship between the diameter of the cylinder of the coal mill and the guide distance. As shown in FIG. 1, the relationship between the diameter of the cylinder of the coal mill and the guide distance is represented by the formula: Figure 2
[0054] L=(b-2c-a) / 2;
[0055] Wherein, L represents the guide distance, b represents the cylinder diameter of the coal mill, c represents the thickness of the inner liner of the cylinder, and a represents the inner diameter of the static ring. The formula can quickly and directly determine the relationship between the cylinder diameter of the coal mill and the guide distance according to the inner diameter of the static ring and the thickness of the inner liner of the cylinder, without complex geometric derivation or a large number of experimental measurements, greatly simplifying the process of determining the relationship between the cylinder diameter and the guide distance, and improving the efficiency of design and analysis.
[0056] In another embodiment of the present disclosure, the step S102 is performed as follows.
[0057] The minimum value of the cylinder diameter of the coal mill is determined according to the relationship between the cylinder diameter and the guide distance with the threshold value of the guide distance as a constraint, and the formula is as follows:
[0058] L = (b-2c-a) / 2 >= X
[0059] b >= b min = 2c+a+2X
[0060] Wherein, b min represents the minimum value of the cylinder diameter of the coal mill, and X represents the threshold value of the guide distance.
[0061] In the embodiment of the present disclosure, the minimum value calculation formula b min = 2c+a+2X of the cylinder diameter of the coal mill is derived with the threshold value of the guide distance as a constraint condition and in combination with the relationship formula between the cylinder diameter and the guide distance, so as to quantify the minimum standard that the cylinder diameter needs to meet and ensure that the guide distance is not less than the threshold value, thereby effectively controlling the cylinder wear. Given the threshold value X of the guide distance, the constraint condition that the guide distance is not less than the threshold value is represented as L >= X according to the determined relationship formula L = (b-2c-a) / 2 between the cylinder diameter and the guide distance. The inequality is derived to obtain b min = 2c+a+2X, wherein b min is the minimum value that the cylinder diameter must meet. If the actually designed cylinder diameter is less than b min , the guide distance will be less than the threshold value X, increasing the risk of cylinder wear. When the cylinder of the coal mill is designed, the calculated b min is the lowest standard that must be followed. For example, in combination with other process parameters such as the ventilation volume and grinding output of the coal mill, the final cylinder diameter is determined in the range not less than b min . If the cylinder diameter required by other process parameters is greater than b min , the other process parameters can be used as the reference; if it is less than b min , b min is used as the reference for adjustment to ensure that the constraint condition of the guide distance is met.
[0062] In yet another embodiment of the present disclosure, the threshold of the flow guide distance is 185 mm.
[0063] In an embodiment of the present disclosure, the threshold of the flow guide distance is 185 mm. In the long-term operation monitoring of the medium-speed coal mill (such as ZGM, MPS, and HP type), it is found that when the flow guide distance L is greater than or equal to 185 mm, the airflow inside the coal mill can form a stable laminar flow state. This stable laminar flow can avoid the formation of high-speed vortex and turbulent vortex between the cylinder and the static ring, reduce the impact and collision of coal particles on the inner wall of the cylinder, and thus effectively reduce the wear of the cylinder.
[0064] Based on the same disclosure concept, an embodiment of the present disclosure also provides a coal mill. Since the principle of the problem solved by the coal mill is similar to the aforementioned method for determining the diameter of the coal mill cylinder based on the optimized flow guide distance, the implementation of the coal mill can be referred to the implementation of the aforementioned method, and the repeated parts will not be described herein.
[0065] An embodiment of the present disclosure provides a coal mill, as shown in Figure 2 The coal mill comprises a cylinder 201, a cylinder inner guard plate 202, a static ring 203, and a dynamic ring 204.
[0066] The cylinder inner guard plate 202 is arranged on the inner wall of the cylinder 201.
[0067] The static ring 203 is arranged on the inner wall 207 of the cylinder inner guard plate.
[0068] A gap 205 is formed between the static ring 203 and the dynamic ring 204.
[0069] The diameter of the cylinder is determined based on the relationship between the diameter of the cylinder and the flow guide distance, with the threshold of the flow guide distance as a constraint. The flow guide distance is the distance between the inner edge 206 of the static ring and the inner wall 207 of the cylinder inner guard plate. The flow guide distance is used to avoid the impact of the coal particles carried by the primary air flow passing through the gap 205 on the inner wall 207 of the cylinder inner guard plate.
[0070] In yet another embodiment of the present disclosure, the relationship between the diameter of the cylinder and the flow guide distance of the coal mill is determined based on the inner diameter of the static ring and the thickness of the cylinder inner guard plate.
[0071] In yet another embodiment of the present disclosure, the relationship between the diameter of the cylinder and the flow guide distance of the coal mill is determined based on the inner diameter of the static ring and the thickness of the cylinder inner guard plate, and the formula is expressed as:
[0072] L = (b-2c-a) / 2;
[0073] Wherein, L represents the flow guide distance, b represents the diameter of the cylinder of the coal mill, c represents the thickness of the cylinder inner guard plate, and a represents the inner diameter of the static ring.
[0074] In yet another embodiment of the present disclosure, the threshold of the guide distance is used as a constraint for the cylinder diameter, which is determined based on the relationship between the cylinder diameter of the coal mill and the guide distance, and is expressed by the formula:
[0075] L = (b - 2c - a) / 2 ≥ X;
[0076] b ≥ b min = 2c + a + 2X;
[0077] wherein b min represents the minimum value of the cylinder diameter of the coal mill, and X represents the threshold of the guide distance.
[0078] In yet another embodiment of the present disclosure, the threshold of the guide distance is 185 mm.
[0079] From the above description of the embodiments, those skilled in the art can clearly understand that the embodiments of the present disclosure can be implemented by hardware, or by means of software and necessary universal hardware platforms. Based on such understanding, the technical solutions of the embodiments of the present disclosure can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a U disk, a mobile hard disk, etc.), and includes a number of instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute the methods described in various embodiments of the present disclosure.
[0080] Those skilled in the art can understand that the drawings are only schematic of a preferred embodiment, and the modules or flows in the drawings are not necessarily required for implementing the present disclosure.
[0081] Those skilled in the art can understand that the modules in the device in the embodiments can be distributed in the device in the embodiments according to the description of the embodiments, or can be changed and located in one or more devices different from the embodiments. The modules of the above embodiments can be combined into one module, or can be further split into multiple sub-modules.
[0082] The above sequence numbers of the embodiments of the present disclosure are only for description, and do not represent the advantages and disadvantages of the embodiments.
[0083] Obviously, those skilled in the art can make various modifications and changes to the present disclosure without departing from the spirit and scope of the present disclosure. Thus, if these modifications and changes of the present disclosure belong to the scope of the claims of the present disclosure and their equivalent technologies, the present disclosure also intends to include these modifications and changes.
Claims
1. A method for determining the diameter of a coal mill barrel based on diversion distance optimization, characterized in that, The method comprises: determining the relationship between the barrel diameter of the coal mill and the guide distance; wherein the guide distance is the distance between the inner edge of the static ring and the inner wall of the barrel inner shield; a gap is formed between the static ring and the dynamic ring, and the guide distance is used to avoid the impact of the primary air flow carrying coal particles on the inner wall of the barrel inner shield passing through the gap; determining the barrel diameter of the coal mill according to the relationship between the barrel diameter and the guide distance, with the threshold value of the guide distance as a constraint.
2. The method of claim 1, wherein, The determination of the relationship between the barrel diameter of the coal mill and the guide distance comprises: obtaining the inner diameter of the static ring and the thickness of the barrel inner shield; determining the relationship between the barrel diameter of the coal mill and the guide distance according to the inner diameter of the static ring and the thickness of the barrel inner shield.
3. The method of claim 2, wherein, The determination of the relationship between the barrel diameter of the coal mill and the guide distance according to the inner diameter of the static ring and the thickness of the barrel inner shield is expressed by the formula: L = (b-2c-a) / 2; wherein L represents the guide distance, b represents the barrel diameter of the coal mill, c represents the thickness of the barrel inner shield, and a represents the inner diameter of the static ring.
4. The method of claim 3, wherein, The determination of the barrel diameter of the coal mill according to the relationship between the barrel diameter and the guide distance, with the threshold value of the guide distance as a constraint, comprises: determining the minimum value of the barrel diameter of the coal mill according to the relationship between the barrel diameter and the guide distance, with the threshold value of the guide distance as a constraint, which is expressed by the formula: L = (b-2c-a) / 2 ≥ X; b ≥ b min = 2c + a + 2x; where b min represents the minimum value of the mill barrel diameter, X represents the threshold value of the guide distance.
5. The method of claim 1, wherein, The threshold value of the guide distance is 185 mm.
6. A coal mill characterised in that, The method comprises: a barrel, a barrel inner shield, a static ring and a dynamic ring; The barrel inner shield is arranged on the inner wall of the barrel; The static ring is arranged on the inner wall of the barrel inner shield; A gap is formed between the static ring and the dynamic ring; The barrel diameter is determined based on the relationship between the barrel diameter of the coal mill and the guide distance, with the threshold value of the guide distance as a constraint; the guide distance is the distance between the inner edge of the static ring and the inner wall of the barrel inner shield; the guide distance is used to avoid the impact of the primary air flow carrying coal particles on the inner wall of the barrel inner shield passing through the gap.
7. A coal mill as claimed in claim 6, wherein, The relationship between the barrel diameter of the coal mill and the guide distance is determined based on the inner diameter of the static ring and the thickness of the barrel inner shield.
8. A coal mill as claimed in claim 7, wherein, The relationship between the barrel diameter of the coal mill and the guide distance is determined based on the inner diameter of the static ring and the thickness of the barrel inner shield, which is expressed by the formula: L = (b-2c-a) / 2; wherein L represents the guide distance, b represents the barrel diameter of the coal mill, c represents the thickness of the barrel inner shield, and a represents the inner diameter of the static ring.
9. A coal mill as claimed in claim 8, wherein, The barrel diameter is determined based on the relationship between the barrel diameter of the coal mill and the guide distance, with the threshold value of the guide distance as a constraint, which is expressed by the formula: L = (b-2c-a) / 2 ≥ X; b ≥ b min = 2c + a + 2x; where b min represents the minimum value of the coal mill barrel diameter, X represents the threshold value of the guide distance.
10. A coal mill as claimed in claim 6, wherein, The threshold value of the guide distance is 185 mm.