A simple simulation analysis method for filter cartridge dust collector or bag dust collector

Abstract

The application discloses a simple filter cartridge dust collector or cloth bag dust collector simulation analysis method and relates to the field of computational fluid dynamics, and comprises the following steps: extracting a real single-bin chamber model from a filter cartridge dust collector or a cloth bag dust collector, setting a guide plate structure for simulation, and obtaining a single-bin chamber model A; simplifying the filter cartridge structure or the cloth bag structure in the single-bin chamber model A, forming a new filter structure, and establishing a single-bin chamber model B; simulating the single-bin chamber model B, comparing the single-bin chamber model A, correcting the new filter structure, obtaining an equivalent filter structure and an equivalent single-bin chamber model C; applying the single-bin chamber model C to simulate the whole dust collector and optimizing the guide structure of the dust collector. The application firstly optimizes the uniformity of the flow field in the single-bin chamber, then establishes the equivalent filter structure to simplify the filter cartridge structure or the cloth bag structure, and applies the equivalent filter structure to the dust collector model for simulation, so that the simulation difficulty can be greatly reduced, the simulation time and the design period can be greatly shortened under the condition of meeting the existing precision.

Description

Technical Field

[0001] This invention belongs to the field of computational fluid dynamics, and in particular relates to a simple simulation analysis method for cartridge dust collectors or bag dust collectors. Background Technology

[0002] Computational fluid dynamics is an interdisciplinary field that combines fluid mechanics and numerical methods, using numerical methods to solve the governing equations describing flow, heat transfer, and mass transfer through computers. It has wide applications in the automotive, aerospace, environmental protection, and petrochemical industries, and is an effective way to solve complex flow phenomena, make rapid responses, save project time, and reduce company costs.

[0003] Cartridge dust collectors or baghouse dust collectors rely on the physical interception of filter cartridges to filter dust. Thousands of filter cartridges or bags are evenly arranged in individual compartments. Some cartridges or bags can be up to 8 meters long and approximately 160 mm in diameter. The airflow velocity before entering the filter cartridges or bags directly affects the filtration velocity. Excessive airflow velocity not only causes the cartridges or bags to sway and collide with each other, accelerating their breakage, but also shortens their service life. Applying computational fluid dynamics principles and using simulation analysis methods to scientifically study the problems existing in cartridge dust collectors or baghouse dust collectors can not only shorten the design cycle but also reduce the maintenance costs of the filter cartridges or bags, and increase their service life.

[0004] Current simulations of cartridge or bag filters primarily involve modeling the entire dust collector and optimizing the flow field across its entirety. This approach is suitable for situations with a limited number of cartridges or bags. However, when dealing with thousands or tens of thousands of cartridges or bags, full-domain modeling not only demands high-performance computing resources but also requires significantly more time and effort. For projects with tight design deadlines, this often fails to meet the required timelines. Therefore, for scenarios with a large number of cartridges or bags, there is an urgent need for a simplified simulation analysis method for cartridge or bag filters. Summary of the Invention

[0005] In view of this, the purpose of this invention is to provide a simple simulation analysis method for cartridge dust collectors or bag dust collectors. This method involves extracting a single compartment from the dust collector and performing detailed simulation analysis on all the cartridges or bags within it, replacing them with an equivalent filtration structure. Then, the optimized equivalent single-compartment model is applied to the entire dust collector model for simulation analysis, ensuring that the non-uniformity of airflow distribution within each independent single compartment is ≤10%. While meeting existing design accuracy requirements, this method can significantly reduce the computational burden on the computer, greatly shorten simulation time and design cycle, and facilitate the improvement of cartridge lifespan.

[0006] To achieve the above objectives, the present invention provides a simple simulation analysis method for cartridge dust collectors or bag dust collectors, comprising the following steps:

[0007] S1: Extract a real single-compartment model from a cartridge dust collector or bag dust collector, set up a baffle structure for simulation, and obtain single-compartment model A;

[0008] S2: Simplify the filter cartridge or bag structure in the single-compartment model A to form a new filtration structure and establish the single-compartment model B;

[0009] S3: Simulate the single-compartment model B, compare it with the single-compartment model A, modify the new filter structure, and obtain the equivalent filter structure and the single-compartment model C;

[0010] S4: Apply the single-compartment model C to simulate the entire dust collector and optimize the dust collector's flow guide structure.

[0011] As a preferred embodiment of the present invention, the cartridge dust collector or bag dust collector includes a dust collector body composed of multiple independent single compartments, a dust collector inlet duct, a dust collector exhaust duct, and a dust collector flow guiding structure.

[0012] As a preferred embodiment of the present invention, a real single compartment includes a smoke inlet, a smoke inlet pipe, an ash hopper, a filter compartment, a filter cartridge or bag structure, a smoke exhaust compartment, and a smoke exhaust outlet; the filter cartridge or bag structure is composed of multiple filter cartridges or bags arranged in an array.

[0013] As a preferred embodiment of the present invention, the simulated single-compartment model A has a baffle structure installed in the ash hopper of the real single-compartment model.

[0014] As a preferred embodiment of the present invention, the simulated single-compartment model B replaces the actual filter cartridge structure or bag structure with a new filter structure based on the single-compartment model A.

[0015] As a preferred embodiment of the present invention, the equivalent single-compartment model C is obtained by modifying the parameters of the new filtering structure based on the single-compartment model B.

[0016] In a preferred embodiment of the present invention, in step S1, after setting the guide vane structure, when simulating the single-compartment model A, the maximum flow velocity v of the bottom flow field of the filter cartridge structure or bag structure is required to satisfy: v≤4m / s. In a preferred embodiment of the present invention, the equivalent filter structure is obtained using the following scheme:

[0017] The filter cartridge or bag structure in the single-compartment model A is replaced with a number of large filter cartridges or bags. A perforated plate is used to simulate the perforated outlet at the top of the filter cartridge or bag structure in the single-compartment model A to obtain a new filtration structure. Under the condition that the flow fields at the smoke inlet and smoke outlet of the single compartment are the same, the filtration velocity of the new filtration structure is calculated. When the pressure drop difference between the new filtration structure and the filter cartridge or bag structure in the single-compartment model A is ≤5%, an equivalent filtration structure is obtained. The cross-sectional shape of the large filter cartridges or bags is preferably square or circular.

[0018] As a preferred embodiment of the present invention, the new filtration structure is modified by fine-tuning the parameters of the porous skip model or by increasing the number of large filter cartridges or large bags until the pressure drop difference between the new filtration structure and the single-compartment model A filter cartridge structure or bag structure is ≤5%, thus obtaining an equivalent filtration structure.

[0019] In a preferred embodiment of the present invention, when calculating the pressure drop of the large filter cartridge or large filter bag and the porous plate in the equivalent filtration structure using the porous skip model, the pressure drop of the equivalent filtration structure is calculated according to the following formula:

[0020] △P=A'v+B'v 2

[0021] v = Q / S

[0022] In the formula, ΔP is the pressure drop (or pressure drop) of the equivalent filter structure, A' and B' are fitting coefficients, v is the filtration velocity, Q is the air flow rate, and S is the filtration area. For a real filter cartridge or filter bag, A and B are mainly determined by the inherent properties of the filter bag / filter bag. For an equivalent filter structure, A' = kA and B' = kB are defined, where k is the reduction coefficient.

[0023] As a preferred embodiment of the present invention, the equivalent filter structure is modified according to the following scheme:

[0024] When establishing an equivalent filtration structure, the flow field or pressure drop of a single-compartment model B or C must meet the following requirements: compared with the flow field velocity or pressure drop at the same location below the filter cartridge structure or bag structure in single-compartment A, the relative deviation of the flow field velocity or pressure drop of single-compartment model B or C is ≤5%, and the calculation is performed according to the following formula:

[0025]

[0026]

[0027]

[0028] In the formula, ε represents the relative deviation of flow velocity, and ε' represents the relative deviation of pressure drop. For the standard deviation of flow rate, Let be the flow velocity within a certain grid at a certain location. Let A be the mean velocity of the flow field across all grid cells at a given location. f Let be the area of ​​a grid cell at a certain location. The standard deviation of single-compartment model B or C. Let ΔP1 be the standard deviation of single-compartment model A, ΔP1 be the pressure drop of single-compartment model B or C, and ΔP0 be the pressure drop of single-compartment model A.

[0029] As a preferred embodiment of the present invention, the number of large filter cartridges or large filter bags when establishing the equivalent filtration structure is determined by the following method: First, one large filter cartridge or large filter bag is used for equivalent replacement. If the new filtration structure can meet the requirements of flow field velocity or pressure drop, then the number of large filter cartridges or large filter bags is one. If it does not meet the requirements, the number of large filter cartridges or large filter bags is gradually increased until the modified new filtration structure can meet the requirements of flow field velocity or pressure drop.

[0030] As a preferred embodiment of the present invention, in step S4, after the dust collector's airflow guiding structure is optimized, the non-uniformity of the airflow distributed in each independent single compartment of the dust collector is required to be ≤10%.

[0031] Beneficial effects

[0032] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0033] (1) The core principle of this invention is to simplify the actual filter cartridge structure or bag structure in a single compartment, establish a better equivalent filtration structure based on the deviation requirements of flow field velocity or pressure drop, and then extend the equivalent single compartment to the entire dust collector for simulation, and optimize the flow guiding structure of the dust collector.

[0034] (2) Since the airflow in the real single-compartment chamber before optimization is extremely turbulent and the simulation results are not meaningful, the present invention first sets up a baffle structure in the ash hopper of the real single-compartment model to improve the uniformity of the inlet airflow field of the single-compartment filter structure or bag structure. Based on this, a simulated single-compartment chamber A is established as the basis for subsequent analysis, which greatly improves the reliability of the simulation results.

[0035] (3) The method of the present invention can reduce the requirements for computer configuration, greatly reduce the simulation difficulty of the computer, and greatly shorten the simulation time and design cycle while meeting the existing design accuracy requirements. It can provide a reference for subsequent simulation analysis.

[0036] (4) By optimizing the design of the dust collector's airflow guide structure, the uniformity of airflow distribution in each independent single compartment of the dust collector is improved, and the excessive local airflow is avoided from causing strong scouring of the filter cartridge structure or bag structure, thereby improving the service life of the filter cartridge structure or bag structure and enhancing the overall performance of the dust collector. Attached Figure Description

[0037] Figure 1 The flowchart illustrates a simple simulation analysis method for cartridge dust collectors or bag dust collectors provided by this invention.

[0038] Figure 2 This is a three-dimensional schematic diagram of the dust collector system in a specific embodiment.

[0039] Figure 3 This is a top view of the dust collector system in a specific embodiment.

[0040] Figure 4 This is a front view of the dust collector system in a specific embodiment.

[0041] Figure 5 This is a schematic diagram of an equivalent single-compartment model for a specific embodiment.

[0042] Figure 6 The flow field distribution diagram at the bottom cross section of the filter cartridge structure or bag structure in a specific embodiment is shown in the single-compartment model A.

[0043] Figure 7 This is a comparison diagram of the vertical mid-section flow field distribution of a single-compartment model B in a specific embodiment.

[0044] Figure 8 This is a comparison diagram of the flow field distribution at the top section of the ash hopper in a single-compartment model B, as shown in the specific embodiment.

[0045] Figure 9 This is a comparison diagram of the flow field distribution at the center section of the smoke inlet duct in a single-compartment model B of a specific embodiment.

[0046] Figure 10 This is a flow field distribution diagram of the central section of the dust collector system in a specific embodiment.

[0047] Figure 11 This is a comparison chart of the uniformity of each individual compartment in a specific embodiment.

[0048] Explanation of reference numerals in the attached figures:

[0049] (1) Single compartment; (2) Dust collector body; (3) Dust collector inlet duct; (4) Dust collector exhaust duct; (5) Dust collector flow guide structure; (11) Smoke inlet; (12) Smoke inlet duct; (13) Dust hopper; (14) Filter compartment; (15) Filter cartridge structure or bag structure; (16) Exhaust compartment; (17) Exhaust port; (18) Flow guide plate structure; (191) New filter structure; (192) Equivalent filter structure. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] It should be noted that the words "up," "down," "left," and "right" used in the embodiments to indicate direction should not be construed as limiting the present invention.

[0052] As attached Figure 1 As shown, this invention provides a simple simulation analysis method for cartridge dust collectors or bag dust collectors, which includes the following steps:

[0053] S1: Extract a real single-compartment model from a cartridge dust collector or bag dust collector, set up a baffle structure for simulation, and obtain single-compartment model A;

[0054] S2: Simplify the filter cartridge structure or bag structure 5 in the single-compartment model A to form a new filter structure 191, and establish the single-compartment model B.

[0055] S3: Simulate the single-compartment model B, compare it with the single-compartment model A, and modify the new filter structure 191 to obtain the equivalent filter structure 192 and the single-compartment model C.

[0056] S4: Apply the single-compartment model C to simulate the entire dust collector and optimize the dust collector's flow guiding structure 5.

[0057] To further illustrate and explain the operation steps and effects of the method described in this invention, specific embodiments are described below. Specific Implementation Example 1:

[0059] As attached Figures 2-5 As shown, a real dust collector contains 32 single chambers 1, divided into 4 groups, with 8 sub-chambers in each group. There is no guide plate structure 18 in the single chamber 1. Each single chamber 1 is equipped with 320 filter bags, and the total number of filter bags in the dust collector is 10240. The diameter of the actual filter bags used is φ140mm and the length is 2m. The inherent property parameters are A=10783, B=8819, the filtration velocity is v=3.96m / min, the filter cartridge pressure drop is 565Pa, the flow velocity at the smoke inlet 11 of the single chamber 1 is 4.1m / s, and the flow velocity at the smoke outlet 17 is 9.8m / s.

[0060] In this embodiment, the dust collector's flow guiding structure is a middle partition plate, which is located in the smoke inlet pipe 3 at the connection between the dust collector and each single compartment 1. It is arranged diagonally from the upper left to the lower right. The actual distance between the lower right corner of the middle partition plate and the top of the ash hopper 13 is 500mm, and the angle between the middle partition plate and the horizontal plane is 6.17°.

[0061] This embodiment uses a server with 16 cores and 32 threads, a clock speed of 3.1GHz, and 64GB of memory. When modeling with CFD software, to ensure geometric accuracy, the circumference of the filter bag must have at least 12 nodes. Statistics show that a real single-compartment model has approximately 7.5 million meshes, consumes about 13GB of memory, and takes about 10-14 hours to compute. For full-domain modeling, the dust collector model is expected to have over 240 million meshes, consuming over 500GB of memory. The current server configuration is insufficient for efficient computation, and the computation time is incalculable. Such a large number of meshes necessitates the use of a higher-configuration supercomputer.

[0062] Therefore, to improve design efficiency, according to the method described in this invention, it is only necessary to first model a single compartment 1 containing 320 filter bags, first improve the flow field at the bottom of the filter bag structure 15 by setting a guide plate structure 18, and then make an equivalent replacement for the filter bag structure 15 based on this. After obtaining a better equivalent filter structure 192 through simulation analysis, it is applied to the entire dust collector system for simulation. The specific steps are as follows:

[0063] Step S1.

[0064] Since the actual single compartment 1 does not have a baffle structure 18, the airflow velocity before entering the filter cartridge structure or bag structure 15 directly affects the filtration velocity of the filter cartridge structure or bag structure 15. Excessive airflow velocity will not only cause the filter cartridge or bag to sway and collide with each other, accelerating the damage of the filter cartridge or bag, but also shorten the service life of the filter cartridge or bag.

[0065] As attached Figure 5 As shown in (a), a baffle structure 18 was set in the actual single-compartment 1 model, and a single-compartment 1 model A was established. The baffle structure 18 contains two baffles, both of which are arranged vertically. The baffle closer to the smoke inlet pipe 12 is arranged at a higher position than the baffle farther away from the smoke inlet pipe 12.

[0066] The flow field distribution at the bottom of the bag structure 15 inside model A of single-compartment 1 is shown in the attached figure. Figure 6 As shown in the figure, the maximum flow velocity is about 3.48 m / s, which is less than 4.0 m / s and meets the requirements. At this time, it can be considered that the flow field at the bottom of the bag structure 15 in the single-compartment model A is relatively uniform.

[0067] Step S2.

[0068] As attached Figure 5As shown in (b), in the new filter structure 191, a large square filter cartridge is used to replace the real bag structure 15. The filtration velocity v = 31.2 m / min, and the pressure drop of the filter cartridge is kept constant at 565 Pa. The size of the large filter cartridge is 4.64 m × 3.72 m × 2 m (length, width and height), and the reduction factor k = 0.17.

[0069] By comparing the flow field velocity and pressure drop below the bag structure 15 in single-compartment model A and below the new filter structure 191 in single-compartment model B, it can be found that the flow field velocity or pressure drop meets the 5% deviation requirement. The flow field velocity at the vertical mid-section of single-compartment 1 is selected (see attached diagram). Figure 7 ), Flow field velocity at the center section of flue gas inlet duct 12 (attached) Figure 8 ), Flow field velocity at the top section of ash hopper 13 (attached) Figure 9 Taking the pressure drop from the smoke inlet 11 to the top of the ash hopper 13 as an example, compared with the single-compartment model A, the relative deviation of the flow field velocity in the vertical mid-section of the single-compartment model B is about 1.54%, the relative deviation of the flow field velocity in the central section of the smoke inlet duct 12 is about 2.03%, the relative deviation of the flow field velocity in the top section of the ash hopper 13 is about 1.19%, and the relative deviation of the pressure drop from the smoke inlet 11 to the top of the ash hopper 13 is 0.44%. All four are ≤5%, which meets the requirements.

[0070] Since the actual filter bag in this embodiment is relatively short, the new filter structure 191 in the single-compartment model B already meets the requirements after replacing it with a large filter cartridge. Therefore, in this embodiment, the new filter structure 191 is treated as the equivalent filter structure 192, and step S3 is skipped to step S4.

[0071] Step S4.

[0072] Before the partition plate was optimized, the uniformity of the flow field in each single compartment 1 did not meet the requirements. Therefore, the partition plate was optimized in this embodiment. After optimization, the distance between the lower right corner of the partition plate and the top of the ash hopper 13 is zero, and the angle between the partition plate and the horizontal plane is 6.99°.

[0073] According to the appendix Figure 10 The flow field distribution diagram of the central section of the dust collector system shown is illustrated. The single chambers in this embodiment are numbered from left to right and from top to bottom. The average flow velocity at the smoke inlet 11 of each single chamber 1 was statistically analyzed, as shown in the attached diagram. Figure 11 The flow velocity uniformity deviation diagram shown reveals that the average flow velocity deviation at the smoke inlet 11 of single compartment 1 remains within 10%, meeting the uniformity requirements. The horizontal axis represents the bag number, and the vertical axis represents the uniformity deviation (%).

[0074] According to statistics, after adopting the method described in this invention, the number of meshes for a single-compartment 1 model B or C is approximately 360,000. When modeling the entire domain, the number of meshes for the dust collector model using the equivalent single-compartment 1 model C is approximately 12 million, with a memory consumption of approximately 26GB and a computation time of approximately 16-24 hours for a single operating condition. Therefore, compared to before equivalence, the computational load and design cycle of the dust collector model using the equivalent single-operating-condition global modeling are significantly reduced. Specific Implementation Example 2:

[0076] Reference Appendix Figures 2-5 As shown, a real dust collector system has 28 individual compartments 1, divided into 2 groups of 14 compartments each. No baffle structure 18 is installed in any of the individual compartments. Each individual compartment 1 contains 352 filter bags with a diameter of φ160mm and a length of 6m, meaning the dust collector system contains a total of 9856 filter bags.

[0077] The server configuration is 16 cores and 32 threads, with a main frequency of 3.1GHz and 64GB of memory. When modeling with CFD software, to ensure geometric accuracy, the circumference of the filter bag must have at least 12 nodes. Thus, the number of meshes for the dust collector system model is expected to exceed 400 million, and the memory consumption is expected to exceed 800GB. The current server configuration is insufficient for efficient calculation, and the computation time is incalculable. Such a large number of meshes can only be computed using a supercomputer with higher configuration.

[0078] In this embodiment, the single-compartment 1 model B or C using the method described in this invention has approximately 800,000 meshes. Based on this, the equivalent single-compartment 1C dust collector model has approximately 25 million meshes, with an estimated memory consumption of approximately 38GB and a computation time of approximately 26-34 hours for a single operating condition. Therefore, compared to the original model, the computational load and design cycle of the dust collector model after the equivalence are significantly reduced.

[0079] As can be seen from the above embodiments, when the number of filter cartridges or bags contained in the filter cartridge structure or bag structure 15 in a single compartment 1 is small, simulation analysis can still be completed without simplification. However, when the number of filter cartridges or bags is large, such as dozens or hundreds, the simulation analysis of a single compartment is not a problem, but extending it to the modeling and analysis of the entire dust collector is extremely difficult. This is because the number of filter cartridges or bags in the entire dust collector will reach tens of thousands or even more when modeling the entire area. This places extremely high demands on the computer configuration, seriously affecting design efficiency and design cycle. Modeling the entire area under a single working condition is very complex and computationally time-consuming. The design of a dust collector system is not something that can be done overnight; relevant parameters need to be adjusted and optimized multiple times. The extension of the optimization process will greatly increase the design cycle, which cannot meet the requirements of the engineering design schedule. Therefore, when performing simulation design on a dust collector with a large number of filter cartridges or bags, it is very necessary to use the method described in this invention to simplify the filter cartridge structure or bag structure 15, reduce the computational burden on the computer, and improve design efficiency.

[0080] Furthermore, when simplifying the filter cartridge structure or bag structure 15 in the actual dust collector, the influence of the internal gaps of individual filter cartridges or bags or the gaps between filter cartridges or bags in the filter cartridge structure or bag structure 15 is ignored when establishing the new filter structure 191. In reality, the new filter structure 191 still has certain differences from the filter cartridge structure or bag structure 15. This will change the flow field of the single-compartment model A. If the difference is too large, the simulation analysis will lose its meaning. Therefore, in order to minimize the impact of this difference on the simulation results, it is necessary to modify the filter structure as described in step S3. Further simulation analysis was performed on single-compartment model B, and then the simulation results were compared with those of single-compartment model A. The new filter structure 191 was continuously modified, and the parameters were adjusted to meet the relative deviation requirements of the flow field velocity or pressure drop. At this point, it was necessary to ensure that the flow field velocity or pressure drop below the equivalent filter structure 192 before and after the equivalent filter structure 192 was as similar as possible to that below the filter cartridge structure or bag structure 15. Then, the final equivalent filter structure 192 was obtained, and a new equivalent single-compartment 1C was re-established using the equivalent filter structure 19 for the simulation of the dust collector system. When the length of the filter cartridge or bag in the filter cartridge or bag structure 15 is relatively short, the bottom of the filter cartridge or bag is far from the ash hopper, and the flow field at the bottom of the filter cartridge or bag structure 15 is easier to become uniform. In this case, the new filter structure 191 in single-compartment model B may not need to be modified to meet the requirements of the equivalent filter structure 192. However, for the filter cartridge or bag with a longer length, the bottom of the filter cartridge or bag is closer to the ash hopper, and multiple modifications are generally required to obtain the equivalent filter structure 19.

[0081] Furthermore, since a real dust collector system contains multiple single chambers 1 arranged in an array, the flow field at the inlet 11 of each single chamber 1 varies significantly. A higher flow velocity results in a higher velocity entering the ash hopper 13 and filter chamber 14, leading to more intense scouring of the filter cartridge or bag structure 15. Excessive flow velocity severely impacts the service life of the filter cartridge or bag structure 15. Conversely, a lower flow velocity has less impact on the filter cartridge or bag structure 15, but insufficient air intake prevents the full utilization of its effective filtration area, thus affecting the filtration efficiency. Consequently, the service life of the filter cartridge or bag structure 15 varies within different single chambers 1, significantly reducing the dust collector's filtration efficiency. To improve the service life of the filter cartridge or bag structure 15 while maximizing the dust collector's filtration efficiency, the airflow distribution within each single chamber must be relatively uniform, while simultaneously meeting the maximum filtration velocity requirements of the filter cartridge or bag structure 15. Therefore, the dust collector's airflow guiding structure 5 needs to be optimized when necessary, but this will not have a significant impact on the mesh generation of the entire dust collector simulation model. In engineering, the dust collector's airflow guiding structure 5 mainly adopts a baffle plate, and when appropriate, a guide plate may be set near the baffle plate, or even other structures may be set. In addition, a guide plate structure 18 is set inside the single compartment 1. The purpose of all these is to improve the uniformity of the inlet airflow in the single compartment 1 and increase the service life of the dust collector.

[0082] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A simple simulation analysis method for cartridge dust collectors or bag dust collectors, characterized in that, The method includes the following steps: S1: Extract a real single-compartment model from a cartridge dust collector or bag dust collector, set up a baffle structure for simulation, and obtain single-compartment model A; the simulated single-compartment model A has a baffle structure set in the ash hopper of the real single-compartment model; when simulating single-compartment model A, the maximum flow velocity v of the bottom flow field of the cartridge structure or bag structure is required to satisfy v≤4m / s; S2: Simplify the filter cartridge or bag structure in the single-compartment model A to form a new filtration structure and establish a single-compartment model B; the simulated single-compartment model B replaces the real filter cartridge or bag structure with the new filtration structure based on the single-compartment model A. S3: Simulate the single-compartment model B, compare it with the single-compartment model A, and modify the new filter structure to obtain the equivalent filter structure and the single-compartment model C; the equivalent single-compartment model C is obtained by modifying the parameters of the new filter structure based on the single-compartment model B. S4: Apply the single-compartment model C to simulate the entire dust collector and optimize the dust collector's flow guide structure; The equivalent filter structure is obtained using the following scheme: The filter cartridge or bag structure in the single-compartment model A is replaced with a number of large filter cartridges or bags. A perforated plate is used to simulate the perforated outlet at the top of the filter cartridge or bag structure in the single-compartment model A to obtain a new filtration structure. Under the condition that the flow fields at the smoke inlet and smoke outlet of the single compartment are the same, the filtration velocity of the new filtration structure is calculated. When the relative deviation of the pressure drop between the new filtration structure and the filter cartridge or bag structure in the single-compartment model A is ≤5%, an equivalent filtration structure is obtained.

2. The simple simulation analysis method for cartridge dust collectors or bag dust collectors according to claim 1, characterized in that, A cartridge dust collector or bag dust collector includes a dust collector body composed of multiple independent single compartments, a dust collector inlet duct, a dust collector exhaust duct, and a dust collector flow guiding structure; A typical single-compartment chamber includes a smoke inlet, a smoke inlet pipe, an ash hopper, a filter chamber, a filter cartridge structure or a bag structure, a smoke exhaust chamber, and a smoke exhaust outlet; the filter cartridge structure or bag structure is composed of multiple filter cartridges or bags arranged in an array.

3. The simple simulation analysis method for cartridge dust collectors or bag dust collectors according to claim 2, characterized in that, The new filtration structure is modified by fine-tuning the parameters of the porous skip model or by increasing the number of large filter cartridges or large bags until the pressure drop difference between the new filtration structure and the filter cartridge structure or bag structure in the single-compartment model A is ≤5%, thus obtaining an equivalent filtration structure.

4. The simple simulation analysis method for cartridge dust collectors or bag dust collectors according to claim 2, characterized in that, The pressure drop of the large filter cartridge or large filter bag and the porous plate in the equivalent filtration structure is calculated using a porous skip model. The pressure drop of the equivalent filtration structure is calculated according to the following formula: △P=A’v+B’v 2 ; v = Q / S; In the formula, ΔP is the pressure drop of the equivalent filter structure, A' and B' are fitting coefficients, v is the filtration velocity, Q is the airflow rate, and S is the filter area.

5. The simple simulation analysis method for cartridge dust collectors or bag dust collectors according to claim 2, characterized in that, When establishing an equivalent filtration structure, the flow field or pressure drop of a single-compartment model B or C must meet the following requirements: compared with the flow field velocity or pressure drop at the same location below the filter cartridge structure or bag structure in single-compartment A, the relative deviation of the flow field velocity or pressure drop of single-compartment model B or C is ≤5%, and the calculation is performed according to the following formula: ； ； ； In the formula, For the standard deviation of flow rate, For relative deviation of flow velocity, 'This represents the relative deviation of the pressure drop.' Let be the flow velocity within a certain grid at a certain location. This represents the average flow velocity across all grid cells at a given location. Let be the area of ​​a grid cell at a certain location. The standard deviation of single-compartment model B or C. Let A be the standard deviation of the single-compartment model A. For the pressure drop of single-compartment model B or C, Let be the pressure drop of single-compartment model A.

6. The simplified simulation analysis method for cartridge dust collectors or bag dust collectors according to claim 5, characterized in that, When establishing an equivalent filtration structure, the number of large filter cartridges or large filter bags is determined using the following method: First, use one large filter cartridge or large filter bag for equivalent replacement. If the new filtration structure can meet the requirements of flow field velocity or pressure drop, then the number of large filter cartridges or large filter bags is taken as one. If it does not meet the requirements, gradually increase the number of large filter cartridges or large filter bags until the modified new filtration structure can meet the requirements of flow field velocity or pressure drop.

7. The simple simulation analysis method for cartridge dust collectors or bag dust collectors according to claim 1, characterized in that, In step S4, after the dust collector's airflow guiding structure is optimized, the non-uniformity of the airflow distributed in each independent single compartment of the dust collector is required to be ≤10%.

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