Multi-column uniform-layer stacked material homogenizing method

Abstract

The invention discloses a multi-column uniform-layer stacked material homogenizing method, which belongs to the technical field of material stacking, and comprises the following steps: S1, determining the total material stacking height, the material stacking spacing and the total material stacking layer number; s2, a beam type stacker is selected, a lifting type distributing device is arranged below the beam type stacker, a plurality of discharging openings are formed in the distributing device at equal intervals according to the width of the storage yard, and materials are discharged in an overflow mode through the discharging openings of the distributing device; s3, the beam stacker starts to stack materials from the starting point A and moves to the ending point B; then turning from the point B to the point A, and enabling the stacker to reversely run along the initial path for stacking and arriving at the initial point A; and then circulating to form a plurality of longitudinal material layers covering the length of the whole storage yard; when the distributing device conducts first-layer stacking, the initial position of the distributing device is at the lowest point, the distributing device is lifted by the set height after stacking of each layer is completed, and the stacker drives the distributing device to move in a reciprocating mode to distribute materials according to the preset speed till the storage requirement is met.

Description

Technical Field

[0001] This application belongs to the technical field of material stacking technology in dry-process cement plants, and particularly relates to a multi-column uniform layer stacking material homogenization method. Background Art

[0002] The pre-homogenization yard is a place where the raw materials of a dry-process cement plant are pre-homogenized during the storage process before grinding. By adopting special stacking and reclaiming methods and facilities, the fluctuation range of the chemical composition of the raw materials or fuels is reduced, which is a necessary preparation process for the raw meal or fuel composition before entering the kiln to tend to be uniform. The raw material pre-homogenization is mainly completed by the limestone pre-homogenization yard and the auxiliary raw material and fuel pre-homogenization yard. Its function is to minimize the long-term (counted in days) fluctuation of the chemical composition of the batch-in raw materials and fuels. During the storage period of the raw materials, the discharged composition reaches the predetermined uniformity to meet the requirements of the raw meal mill batching control. Therefore, it is required that the fluctuation of the discharged composition of the pre-homogenization yard has the characteristics of short period, high frequency and small amplitude. Generally, pre-homogenization occupies an important position in the raw meal homogenization chain. This process is crucial for the production of high-quality cement. It can not only ensure the quality of clinker, increase the output and reduce the energy consumption, but also stabilize the quality of the cement leaving the factory. However, at the same time, there will be a large amount of dust during the cement pre-homogenization process, such as raw materials like stone powder, dry fine clay, coal powder, cement powder, mineral powder, fly ash, gypsum powder, etc., which can settle under the action of gravity. The internal environment of various yards in cement enterprises is complex, and the problem of dust pollution is particularly prominent. The current stacking methods have problems of large unorganized dust emissions and difficult dust removal, which pose a serious threat to the production environment, the health of employees and the air quality of the surrounding area.

[0003] The raw materials of dry-process cement plants are all granular solid materials, which are different from the liquid raw materials used in general chemical industries and are very difficult to homogenize themselves during transportation and storage. Therefore, the stability of their chemical composition is much worse than that of the latter. Many enterprises with uniform and stable cement quality attach great importance to the pre-homogenization of raw materials. Therefore, cement plants have been looking for the optimal method to homogenize the composition of cement raw materials. The traditional closed long-type pre-homogenization yard is single-line stacking. Due to the restriction of the span of the grid and the reclaiming machine steel beam, to achieve the specified effective storage capacity, only the length of the yard can be increased. However, due to the limitation of the general layout length, it is difficult to meet the storage capacity requirements by simply increasing the length.

[0004] The equipment of the traditional stacking method is relatively large, which results in the plant building of the stockpile to be larger in structure to accommodate the equipment. On the one hand, it causes high construction costs of the stockpile. On the other hand, the feeding height of the equipment limits the volume of the stockpile, resulting in a large stockpile with a small stockpile. The stockpile space cannot be fully utilized, and only a small part is used for stacking. Moreover, a stockpile equipment has only one unloading point, and correspondingly only one stockpile can be stored at the same time. Not only is the feeding speed slow, but the stockpile method is also single, the stockpile efficiency is low, and the homogenization effect is also very general. The homogenization effect depends on the stacking and material taking methods. At present, the traditional stacking methods include herringbone stacking method, wave method, horizontal layer method, etc. These methods are all single-point stacking. This single-point material distribution method can only stack materials at one point, and the stacking speed is very slow. The overall cross-section of the material pile formed by one-point stacking is always a triangle. This triangular structure easily causes material segregation. Due to the influence of the natural repose angle of the material, the higher the level, the smaller the distribution area, the thinner the material layer, and the relatively poorer the homogenization effect. In addition, materials with relatively large particle size will be preferentially stacked below the material layer under the action of gravity, which will lead to uneven stacking layers and uneven material layer thickness, which can easily lead to unstable material composition. Generally, the more distribution layers there are, the smaller the standard deviation is, and the better the homogenization effect is. Therefore, this single-point material distribution method is in urgent need of improvement. Summary of the invention

[0005] The purpose of the present application is to overcome the problems of the prior art and disclose a method for homogenizing materials in multi-row uniform layers. The method adopts a method of increasing the cross-sectional area and length of the stockpile yard at the same time, which is different from the general long pre-homogenization stockpile yard. When stacking materials, unloading points are added, and materials are stacked at multiple points at the same time. The unloading points during stacking are kept in the same straight line, so that the stacking method becomes multi-row, which can significantly improve the material stacking efficiency.

[0006] The purpose of this application is achieved through the following technical solutions: A method for homogenizing multi-row uniformly stacked materials, the method comprising the following steps: S1: Determine the total stacking height, stacking spacing and total number of stacking layers based on the actual conditions of the stockpile, material type, material density, material repose angle and required storage capacity of a single stack; S2: Select a beam stacker. A lifting distributor is provided under the beam stacker. The distributor is provided with a number of discharge ports at equal intervals according to the width of the stockyard. The material is discharged in an overflow manner through each discharge port of the distributor. The total stockpile height is set to the highest point of the distributor, and the spacing between each discharge port of the distributor is set to the stockpile spacing. S3: Determine the traveling path of the gantry stacker. In the preset stacking area, start stacking from the starting point A and move to the ending point B to form several first-layer stacks arranged side by side; then turn from point B to point A, and the stacker runs in the reverse direction along the initial path for stacking and reaches the original starting point A to form the second-layer stack; then repeat the stacking operation in a cycle to form several longitudinal layers covering the entire length of the yard. Moreover, when conducting the first-layer stacking, the initial position of the distributor is at the lowest point, and after completing each layer of stacking, the distributor is lifted by a set height, and the stacker drives the distributor to reciprocate for spreading materials at a preset speed until the storage requirement is met.

[0007] According to a preferred embodiment, step S1 includes: In the preset stacking area, let the width of the yard be Y, the length be X, and the stacking height be H; The discharge points are evenly distributed in the width direction of the yard, and the number is set to n. Each discharge point is marked as Y1~Yn; When the whole yard is stacked, the spacing between each column of stacks is W, and the calculation formula is: W = Y / n. Set the width of the discharge opening as B, the height of the initially discharged stack as h1; set the total number of stacking layers as N; Determine the angle of repose α and the bulk density γ of the material.

[0008] According to a preferred embodiment, the total number of stacking layers N is greater than 400.

[0009] According to a preferred embodiment, in step S3, before stacking, use EDEM to simulate and analyze the stacking process, simulate the material stacking situation, and obtain the stacking speed of each layer at different stacking heights through model calculation to make the thickness of each layer of the stack equal.

[0010] According to a preferred embodiment, the thickness δ of the stack above the second layer is δ=(H - h1) / N, that is, the height by which the distributor is lifted after each layer of spreading is δ.

[0011] According to a preferred embodiment, the calculation process of the stacking speed of each layer at different stacking heights includes: S31: Calculate the stacking width of each layer of the stack. Let the width of each column of the first layer Z1 be w1, the width of each column of the second layer Z2 be w2, the width of each column of the third layer Z3 be w3, the width of each column of the fourth layer Z4 be w4, until the width wx of each column of the xth layer Zx is equal to the overall stack spacing W, and the width of each column of the subsequent top covering layer is W; S32: Based on the widths of the material piles in each layer obtained in step S31, calculate the cross-sectional areas of the columnar material piles in each layer. The cross-sectional area of each column of the first layer Z1 is S1, the cross-sectional area of each column of the second layer Z2 is S2, the cross-sectional area of each column of the third layer Z3 is S3, the cross-sectional area of each column of the fourth layer Z4 is S4, and the cross-sectional area of each column of the x-th layer Zx is Sx. And the cross-sectional areas of the material piles in each layer after the x-th layer Zx are the same and all equal to Sx; S33: Based on the cross-sectional areas of the columnar material piles in each layer obtained in step S32, calculate the stockpiling amounts of the single-column material piles in each layer. The stockpiling amount of the single-column material pile in the first layer is Q1, the stockpiling amount of the single-column material pile in the second layer is Q2, the stockpiling amount of the single-column material pile in the third layer is Q3, the stockpiling amount of the single-column material pile in the fourth layer is Q4, the stockpiling amount of the single-column material pile in the x-th layer is Qx, and the stockpiling amounts of the single-column material piles in each layer after the x-th layer Zx are Qx; S34: Calculate the stockpiling speeds of each layer based on the total stockpiling amount Q of the stacker, the number of discharge points or the number of columns n, and the stockpiling amounts of the single-column material piles in each layer. The stockpiling speed of the first layer is defined as V 1 , the stockpiling speed of the second layer is defined as V 2 , the stockpiling speed of the third layer is defined as V 3 , the stockpiling speed of the fourth layer is defined as V 4 , the stockpiling speed of the x-th layer is defined as V x , and the stockpiling speeds of each layer after the x-th layer Zx are all V x .

[0012] According to a preferred embodiment, in step S31, The stacking width of each column of the material in the first layer Z1 is w1, and w1 = B + 2 * h1 / tan(α); The stacking width of each column of the material in the second layer Z2 is w2, and w2 = B + 2 * (h1 + 1 * δ) / tan(α); The stacking width of each column of the material in the third layer Z3 is w3, and w3 = B + 2 * (h1 + 2 * δ) / tan(α); The stacking width of each column of the material in the fourth layer Z4 is w4, and w4 = B + 2 * (h1 + 3 * δ) / tan(α); The stacking width of each column of the material in the x-th layer Zx is wx, and wx = W.

[0013] According to a preferred embodiment, in step S32, Then the cross-sectional area of each column of the material pile in the first layer Z1 is S1 = (B + w1) * h1 / 2; Then the cross-sectional area of each column of the material pile in the second layer Z2 is S2 = (B + w2) * δ / 2 - S1; Then the cross-sectional area of the stockpile per column of the third layer Z3 is S3 = (B + w3) * δ / 2 - S2; Then the cross-sectional area of the stockpile per column of the fourth layer Z4 is S4 = (B + w4) * δ / 2 - S3; Then the cross-sectional area of the stockpile per column of the x-th layer Zx is Sx = (B + wx) * δ / 2 - S x-1 .

[0014] According to a preferred embodiment, in step S33, The single-column stockpile quantity of the first-layer stockpile is Q1, and Q1 = S1 * X * γ; The single-column stockpile quantity of the second-layer stockpile is Q2, and Q2 = S2 * X * γ; The single-column stockpile quantity of the third-layer stockpile is Q3, and Q3 = S3 * X * γ; The single-column stockpile quantity of the fourth-layer stockpile is Q4, and Q4 = S4 * X * γ; The single-column stockpile quantity of the x-th layer stockpile is Qx, and Qx = Sx * X * γ.

[0015] According to a preferred embodiment, in step S34, The stacking speed of the first layer is V 1 , then V 1 = Q / n / (60 * Q1); The stacking speed of the second layer is V 2 , then V 2 = Q / n / (60 * Q2); The stacking speed of the third layer is V 3 , then V 3 = Q / n / (60 * Q3); The stacking speed of the fourth layer is V 4 , then V 4 = Q / n / (60 * Q4); The stacking speed of the x-th layer is V x , then Vx = Q / n / (60 * Qx).

[0016] The main solution of the present application and its various further alternative solutions can be freely combined to form multiple solutions, all of which are solutions that can be adopted and claimed in the present application. Those skilled in the art can understand that there are various combinations according to the prior art and common general knowledge after understanding the solution of the present application, all of which are the technical solutions to be protected in the present application, and will not be enumerated here.

[0017] The beneficial effects of the present application: 1. This application adopts a new method of stockpiling homogenization. Different from the general long-shaped pre-homogenization stockyard, it increases the cross-sectional area and length of the stockyard simultaneously. When stockpiling, the number of discharge points is increased, and multiple points stockpile simultaneously. The dropping points during stockpiling are kept on the same straight line, making the stockpiling method become multi-column type, which can significantly improve the material stacking efficiency.

[0018] 2. Overflow type discharging, with seamless connection between the discharge port and the stockpile. Without the effect of height difference, the overall dust suppression and ash reduction effect of the stockyard is excellent. 3. The discharge points are arranged uniformly in an array on the cross-section of the stockyard, realizing multi-point simultaneous discharging. In a limited site, multiple stockpiles are formed synchronously. The stacking rate of the stockpile is increased by at least 8 times compared with the traditional single-point stockpiling method. At the same time, the loading and unloading capacity is improved, and the space utilization rate is increased by 4 times, effectively improving the utilization rate of the stockyard.

[0019] 4. Compared with the traditional herringbone stockpiling, the horizontal cross-section of the current stockpile is a long rectangle with the same size (the herringbone one gradually changes from large to small). When laying each layer of cloth, an integral surface is formed among them, which can truly realize uniform thin-layer stacking. A stockpile with a consistent aspect ratio of length and width is formed with multiple layers of stacked material layers. The material distribution is more uniform, the intercepted material layers are uniform when reclaiming, which can reduce quality fluctuations and has strong adaptability to materials.

[0020] 5. Use the three-dimensional model algorithm to conduct three-dimensional modeling of the stockpile. Before stockpiling, simulate the stockpiling first. Through the intelligent regulation of the model, and supplemented by the variable frequency speed regulation method to control the walking speed of the spreader, confirm the number of stockpiling layers and speed more quickly and accurately, and feed back to the automatic control system to correct the operation of equipment such as the spreader in real time, with precise control, reducing deviations, making the thickness of each layer of material layer uniform, reducing the phenomenon of material particle segregation, improving the homogenization ratio, achieving a better mixing effect, greatly improving the stockpiling efficiency, and improving the homogenization effect.

[0021] 6. Through the design technical method of determining the total number of layers first and then the stockpiling thickness, it is ensured that when stacking materials, the stockpile is composed of as many mutually parallel and vertically overlapping material layers with the same thickness as possible. Description of the Drawings

[0022] Figure 1 It is a schematic diagram of the process of the material in this application being filled in the spreader; Figure 2 It is a schematic diagram of the stockpiling walking path of the spreader in the horizontal plane in this application; Figure 3 It is a schematic diagram of the stockpiling walking path of the spreader in the three-dimensional coordinate system in this application; Figure 4 It is a schematic diagram of the vertical cross-section of the stockpile in this application; Figure 5 It is an enlarged schematic diagram of the stockpile in this application. Detailed implementation manners

[0023] The following specific examples illustrate the implementation manners of the present application. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. The present application can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0024] It should be noted that: Similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0025] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed during use. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0026] In addition, the terms "horizontal", "vertical", "hanging", etc. do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0027] In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0028] In addition, it should be pointed out in the present application that in the present application, if the specific structures, connection relationships, positional relationships, power source relationships, etc. involved are not specifically written, then the structures, connection relationships, positional relationships, power source relationships, etc. involved in the present application are all known to those skilled in the art on the basis of the prior art without creative labor.

[0029] Example 1 This application discloses a multi-column and homogeneous layer stacking material homogenization method, and the multi-column and homogeneous layer stacking material homogenization method includes the following steps.

[0030] Step S1: Based on the actual conditions of the storage yard, the variety of materials, the density of materials, the angle of repose of materials, and the required storage capacity of a single pile, determine the total stacking height, stacking spacing, and total number of stacking layers.

[0031] Preferably, within the preset stacking area, let the width of the storage yard be Y, the length be X, and the stacking height be H; the unloading points are evenly distributed in the width direction of the storage yard, and the number is set to n. Each unloading point is marked as Y1~Yn; the spacing between each column of piles during the overall stacking of the pile is W, and the calculation formula is: W = Y / n. The width of the unloading port is set to B, and the height of the pile at the initial unloading is h1; the total number of stacking layers N is set; the angle of repose α and the bulk density γ of the material are determined.

[0032] Preferably, the total number of stacking layers N is greater than 400 to reduce the standard deviation of the material composition on the cross-section of the pile and improve the homogenization system.

[0033] Step S2: Select a gantry stacker. An elevating distributor is arranged under the gantry stacker. As Figure 1 shown, the distributor is provided with a number of unloading ports at equal intervals according to the width of the storage yard. The material is discharged in an overflow manner through each unloading port of the distributor. Among them, the total stacking height is set as the highest point of the distributor, and the spacing between each unloading port of the distributor is set as the pile spacing.

[0034] Preferably, the material first passes through a reciprocating belt and then fills the gantry stacker, and the elevating distributor can feed materials starting from the ground and always keep the distributor full of materials. During the overflow unloading process, there is a seamless connection between each unloading port and the pile. The effect of suppressing dust and reducing ash in the overall storage yard is excellent due to the absence of a drop.

[0035] The gantry stacker is equipped with two speed-regulating motors. One M1 motor is used to drive the gantry stacker to move quickly, and the other M2 motor is used for the slow lifting of the distributor. The variable-frequency speed-regulating motor drive method can enable the stacker to obtain different vehicle speeds. The traveling speed of the stacker can determine the stacking amount and stacking thickness per unit length. The required stacking thickness can be calculated according to the set number of stacking layers. The traveling speed of M1 is inversely calculated based on the material conveying capacity and bulk density. To ensure that the filling between the unloading port and the material is full, according to the previously calculated layer thickness, the action time of the M2 motor is commanded to adjust the height of the distributor.

[0036] Step S3: Determine the traveling path of the gantry stacker. In the preset stacking area, as Figure 2 and Figure 3As shown, starting from the starting point A, materials are stacked and moved to the end point B to form several first-layer material piles arranged side by side; then, turning from point B to point A, the stacker runs in the reverse direction along the initial path, stacks materials, and reaches the original starting point A to form the second-layer material pile; then, the stacking operation is repeated in a cycle to form several longitudinal material layers covering the entire length of the storage yard.

[0037] Specifically, the discharging points evenly distributed in the Y direction walk at a constant speed in the X direction. The walking directions can be divided into X1, X2, X3 ……, Xn walking positions. When the distributor walks to Xn, that is, the end point B, the first-layer material pile is formed.

[0038] Preferably, when the distributor is stacking the first layer, the initial position of the distributor is at the lowest point, and after each layer of stacking is completed, the distributor is lifted by a set height, and the stacker drives the distributor to reciprocate and move for material distribution until the storage requirement is met.

[0039] Among them, the thickness δ of the material pile above the second layer is δ = (H - h1) / N, that is, the height lifted by the distributor after each layer of material distribution is δ.

[0040] Specifically, according to the planned starting and ending coordinates of the stacking, after the system confirms safety, it issues instructions to the corresponding PLC (Programmable Logic Controller) for control and operation. After receiving the stacking command, the PLC of the gantry stacker drives the gantry stacker to the target position, lowers the distributor to the specified height, and then performs the stacking operation according to the established path rules. According to the set positioning data, the deceleration position and lifting position of the stacker are automatically calculated. After reaching the preset end position of the layer, the distributor is lifted in height and then stacks materials towards the starting point. In the automatic cycle mode, the stacking operation is repeated in this way. When the height of the material pile reaches the predetermined height, the operation stops until the current operation is completed; In step S3, before stacking, EDEM is used to simulate and analyze the stacking process, simulate the material stacking situation, and obtain the stacking speed of each layer at different stacking heights through model calculation to make the thickness of each layer of the material pile equal.

[0041] Specifically, in the process of using EDEM to simulate and analyze the stacking process, the calculation process of the stacking speed of each layer at different stacking heights includes the following steps.

[0042] Step S31: Calculate the stacking width of each layer of the material pile. Let the width of each column of the first layer Z1 be w1, the width of each column of the second layer Z2 be w2, the width of each column of the third layer Z3 be w3, the width of each column of the fourth layer Z4 be w4, until the width of each column of the xth layer Zx is equal to the overall spacing W of the material pile, and the width of each column of the subsequent top covering layer is W.

[0043] In step S31, the stacking width of each column of materials in the first layer Z1 is w1, and w1 = B + 2 * h1 / tan(α); the stacking width of each column of materials in the second layer Z2 is w2, and w2 = B + 2 * (h1 + 1 * δ) / tan(α); the stacking width of each column of materials in the third layer Z3 is w3, and w3 = B + 2 * (h1 + 2 * δ) / tan(α); the stacking width of each column of materials in the fourth layer Z4 is w4, and w4 = B + 2 * (h1 + 3 * δ) / tan(α); the stacking width of each column of materials in the x-th layer Zx is wx, and wx = W.

[0044] Compared with the traditional herringbone stacking, the horizontal cross-section of the current material pile is a long rectangle with a consistent size (the herringbone one gradually changes from large to small). When laying materials for each layer after the x-th layer, a whole surface is formed between each other, which can truly achieve uniform thin-layer stacking, form a material pile with a consistent aspect ratio for multiple layers of stacked material layers, the material distribution is more uniform, the intercepted material layers are uniform when taking materials, reducing quality fluctuations, and having strong adaptability to materials.

[0045] Step S32: Based on the stacking widths of each layer obtained in step S31, calculate the cross-sectional areas of the column material piles for each layer of the material pile. The cross-sectional area of each column of the first layer Z1 is S1, the cross-sectional area of each column of the second layer Z2 is S2, the cross-sectional area of each column of the third layer Z3 is S3, the cross-sectional area of each column of the fourth layer Z4 is S4, the cross-sectional area of each column of the x-th layer Zx is Sx, and the cross-sectional areas of the material piles for each layer after the x-th layer Zx are the same, all being Sx.

[0046] In step S32, the cross-sectional area of each column of the first layer Z1 is S1 = (B + w1) * h1 / 2; then the cross-sectional area of each column of the second layer Z2 is S2 = (B + w2) * δ / 2 - S1; then the cross-sectional area of each column of the third layer Z3 is S3 = (B + w3) * δ / 2 - S2; then the cross-sectional area of each column of the fourth layer Z4 is S4 = (B + w4) * δ / 2 - S3; then the cross-sectional area of each column of the x-th layer Zx is Sx = (B + wx) * δ / 2 - S x-1 。

[0047] S33: Based on the cross-sectional areas of the column material piles for each layer obtained in step S32, calculate the stacking amounts of the single-column material piles for each layer. The stacking amount of the single-column material pile in the first layer is Q1, the stacking amount of the single-column material pile in the second layer is Q2, the stacking amount of the single-column material pile in the third layer is Q3, the stacking amount of the single-column material pile in the fourth layer is Q4, the stacking amount of the single-column material pile in the x-th layer is Qx, and the stacking amounts of the single-column material piles for each layer after the x-th layer Zx are Qx.

[0048] In step S33, the stacking quantity of a single-row stockpile in the first layer is Q1, and Q1 = S1 * X * γ; the stacking quantity of a single-row stockpile in the second layer is Q2, and Q2 = S2 * X * γ; the stacking quantity of a single-row stockpile in the third layer is Q3, and Q3 = S3 * X * γ; the stacking quantity of a single-row stockpile in the fourth layer is Q4, and Q4 = S4 * X * γ; the stacking quantity of a single-row stockpile in the x-th layer is Qx, and Qx = Sx * X * γ.

[0049] Step S34: Based on the total stacking quantity Q of the stacker, the number of discharge points or columns n, and the stacking quantity of a single-row stockpile in each layer, calculate the stacking speed of each layer. The stacking speed of the first layer is defined as V 1 , the stacking speed of the second layer is defined as V 2 , the stacking speed of the third layer is defined as V 3 , the stacking speed of the fourth layer is defined as V 4 , the stacking speed of the x-th layer is defined as V x , and the stacking speed of each layer after the x-th layer Zx is V x .

[0050] In step S34, if the stacking speed of the first layer is V 1 , then V 1 = Q / n / (60 * Q1); if the stacking speed of the second layer is V 2 , then V 2 = Q / n / (60 * Q2); if the stacking speed of the third layer is V 3 , then V 3 = Q / n / (60 * Q3); if the stacking speed of the fourth layer is V 4 , then V 4 = Q / n / (60 * Q4); if the stacking speed of the x-th layer is V x , then Vx = Q / n / (60 * Qx).

[0051] During the simulation and analysis of the stacking process using EDEM, by adjusting the total number of stacking layers N through the parametric model, the stacking speed of each layer and each column under different thicknesses can be quickly obtained. Using the discrete element simulation software EDEM to simulate the material conveying and stacking process, simulating its conveying and stacking height processes, analyzing its stacking efficiency and effect, the stacking speed of each layer can be quickly selected when there are different total numbers of stacking layers N and different numbers of columns for stacking. Combining traditional empirical design and modern three-dimensional design to simulate and verify the stacking can ensure the selection of the optimal stacking method.

[0052] This application has at least the following beneficial effects compared to the prior patent application: A multi-linear homogeneous layer continuous cyclic stacking and homogenization method (application number: CN202410452857.0): 1. The stacking path of the prior application patent is that a stacking point distributes materials in the stacking area. Starting from point A as the starting point of the stacking operation, when the stacker reaches the end point B of the stacking operation, a single-row first-layer stockpile is formed. Then, the original end point B is switched to the starting point, and the stacker runs in the reverse direction along the original path to continue stacking until it reaches the original starting point A, forming the second-layer stockpile. Then, the stacking operation is repeated continuously without interruption.

[0053] However, the stacking walking path of the method of this application adopts multi-row distribution with simultaneously increased discharge points, and multiple discharge points move simultaneously: In the stacking area, starting from the starting point A of the stacking operation, stacking continues until the height of the stockpile reaches the turning point B of the stacking operation, forming the first-layer stockpile. Then, the original turning point B is switched to the starting point, and the stacker runs in the reverse direction along the original path to continue stacking until it reaches the original starting point A, forming the second-layer stockpile. Then, the stacking operation is repeated continuously without interruption. Compared with the prior application patent, the stacking form of the prior application has lower efficiency, a more complex path, a longer travel distance, and is time-consuming and laborious.

[0054] The method of this application increases the discharge points compared with the prior application patent, changing the original single-discharge-point stacking into multi-point simultaneous stacking, making the stacking method multi-row. This method cannot be achieved by the prior application patent because the prior art uses a multi-point distributor. Combining this distributor with the method of this invention can maximize the advantages of the equipment. And because it is multi-row simultaneous stacking, it solves the problem of the increased travel distance of the stacker caused by stacking column by column, significantly reducing the stacking travel distance, saving stacking time, and significantly improving the stacking efficiency.

[0055] 2. Since the walking path of the stockpile in the prior application patent is to complete one column and then stack the adjacent column, the cross-sections of the stockpiles are nested and stacked on top of each other. And so on, when stacking the same layer of materials, after one column is stacked and then stacking continues, due to the segregation effect of the materials, the composition of the adjacent stockpiles is not uniform, and this non-uniformity causes the adjacent columns in each layer not to be fully integrated with each other.

[0056] Furthermore, although the prior application patent also controls the thickness of each layer to be consistent, since each layer of the material layer is formed by stacking column by column instead of multi-row simultaneous stacking, it is very difficult to accurately control the actual thickness uniformity of each layer, which makes it easy for the stacking thickness to deviate.

[0057] Furthermore, compared with the traditional herringbone stacking, the horizontal cross-section of the stockpile of this application is a long rectangle with the same size. When distributing materials for each layer, a whole surface is formed between each other, which can truly achieve uniform thin-layer stacking, forming a stockpile with a consistent aspect ratio for multiple layers of stacked material layers. The material distribution is more uniform, the intercepted material layers are uniform when taking materials, which can reduce quality fluctuations and has strong adaptability to materials.

[0058] 3. The prior application's patented stockpiling method has a single stockpiling point with a constant stockpiling height, and the materials fall directly from a fixed height. This method results in a large stockpiling drop, serious dust-raising problems, and poor control of dust pollution. In contrast, the existing technology method uses overflow discharging, with a seamless connection between the discharging port and the stockpile. The absence of a drop achieves excellent overall dust suppression and ash reduction effects in the stockyard.

[0059] 4. The stockpiling method provided by the prior application still relies on existing stockpiling equipment and cannot control the size and shape of the stockpiling machine. This also means that the factory building still has to adapt to the size of the stockpiling machine, so the stockyard space cannot be fully utilized. The present technical method is achieved using a beam conveyor and a multi-discharging port distributor. The greatest advantage of the beam conveyor is that it can be arranged relying on the height of the stockpile shed. Coupled with the telescopic form of the distributor, a certain amount of space occupied by the equipment can be reduced while fully utilizing the height space in the stockyard as a stockpiling area. This also improves the loading and unloading capacity and effectively increases the utilization rate of the stockyard compared to the original technical method.

[0060] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included within the protection scope of the present application.

Claims

1. A method for homogenizing multi-row uniformly stacked materials, characterized in that: The method for homogenizing multi-row uniform layer stacked materials comprises the following steps: S1: Determine the total stacking height, stacking spacing and total number of stacking layers based on the actual conditions of the stockpile, material type, material density, material repose angle and required storage capacity of a single stack; S2: Select a beam stacker. A lifting distributor is provided under the beam stacker. The distributor is provided with a number of discharge ports at equal intervals according to the width of the stockyard. The material is discharged in an overflow manner through each discharge port of the distributor. The total stockpile height is set to the highest point of the distributor, and the spacing between each discharge port of the distributor is set to the stockpile spacing. S3: Determine the travel path of the beam stacker, start stacking materials from the starting point A in the preset stacking area and move to the end point B to form several first-layer material piles in parallel; then turn from point B to point A, the stacker runs in the reverse direction along the initial path to stack materials and arrive at the original starting point A to form a second-layer material pile; then the stacking operation is repeated in a cycle to form several longitudinal material layers covering the entire length of the yard; Moreover, when the distributor is stacking the first layer of materials, the initial position of the distributor is at the lowest point, and after each layer of materials is completed, the distributor is raised to a set height, and the stacking machine drives the distributor to move back and forth at a preset speed until the storage requirement is reached.

2. The method for homogenizing multi-row uniformly stacked materials as claimed in claim 1, characterized in that: Step S1 includes: In the preset stockpile area, let the stockpile width be Y, the length be X, and the stockpile height be H; The unloading points are evenly distributed in the width direction of the yard, the number is set to n, and each unloading point is marked as Y1~Yn; When the material pile is piled as a whole, the distance between each row of material piles is W, and the calculation formula is: W=Y / n, The width of the discharge port is set to B, the initial discharge material pile height is h1; the total number of pile layers N is set; Determine the material's angle of repose α and bulk density γ.

3. The method for homogenizing multi-row uniformly stacked materials as claimed in claim 2, characterized in that: The total number of stacking layers N is greater than 400.

4. The method for homogenizing multi-row uniformly stacked materials as claimed in claim 2, characterized in that: In step S3, before stacking, EDEM is used to simulate and analyze the stacking process, simulate the material stacking situation, and obtain the stacking speed of each layer at different stacking heights through model calculation, so that each layer of the material stack has the same thickness.

5. The method for homogenizing multi-row uniformly stacked materials as claimed in claim 4, characterized in that: The thickness of the pile above the second layer is δ=(H- h1) / N, that is, the height to which the distributor is lifted after each layer of distribution is δ.

6. The method for homogenizing multi-row uniformly stacked materials as claimed in claim 5, characterized in that: The calculation process of the stacking speed of each layer at different stacking heights includes: S31: Calculate the width of each layer of the pile, and set the width of each row of the first layer Z1 to be w1, the width of each row of the second layer Z2 to be w2, the width of each row of the third layer Z3 to be w3, and the width of each row of the fourth layer Z4 to be w4, until the width of each row of the x-th layer Zx is wx and is equal to the overall spacing W of the pile, and the width of each row of the subsequent top covering layer is W; S32: Based on the width of each layer of the pile obtained in step S31, the cross-sectional area of ​​each layer of the pile is calculated. The cross-sectional area of ​​each column of the first layer Z1 is S1, the cross-sectional area of ​​each column of the second layer Z2 is S2, the cross-sectional area of ​​each column of the third layer Z3 is S3, the cross-sectional area of ​​each column of the fourth layer Z4 is S4, the cross-sectional area of ​​each column of the x-th layer Zx is Sx, and the cross-sectional area of ​​each layer of the pile after the x-th layer Zx is the same as Sx; S33: Based on the cross-sectional area of ​​each layer of the stockpile obtained in step S32, the stockpile amount of each layer of the stockpile is calculated, the stockpile amount of the first layer of the stockpile is Q1, the stockpile amount of the second layer of the stockpile is Q2, the stockpile amount of the third layer of the stockpile is Q3, the stockpile amount of the fourth layer of the stockpile is Q4, the stockpile amount of the x-th layer of the stockpile is Qx, and the stockpile amount of each layer of the stockpile after the x-th layer Zx is Qx; S34: Based on the total stacking volume Q of the stacker, the number of unloading points or rows n, and the stacking volume of each layer of the stack, the stacking speed of each layer is calculated. The stacking speed of the first layer is defined as V1, the stacking speed of the second layer is defined as V2, the stacking speed of the third layer is defined as V3, the stacking speed of the fourth layer is defined as V4, and the stacking speed of the xth layer is defined as V x , and the stacking speed of each layer after the xth layer Zx is V x .

7. The method for homogenizing multi-row uniformly stacked materials as claimed in claim 6, characterized in that: In step S31, The stack width of each row of materials in the first layer Z1 is w1, w1=B+2* h1 / tan(α); The stack width of each row of materials in the second layer Z2 is w2, w2=B+2*(h1+1*δ) / tan(α); The stack width of each row of materials in the third layer Z3 is w3, w3=B+2*(h1+2*δ) / tan(α); The stack width of each row of materials in the fourth layer Z4 is w4, w4=B+2*(h1+3*δ) / tan(α); The stack width of each column of material in the x-th layer Zx is wx, wx=W.

8. The method for homogenizing multi-row uniformly stacked materials as claimed in claim 6, characterized in that: In step S32, Then the cross-sectional area of ​​the pile in each column of the first layer Z1 is S1=(B+ w1)* h1 / 2; Then the cross-sectional area of ​​each row of the second layer Z2 is S2=(B+ w2)* δ / 2- S1; Then the cross-sectional area of ​​each row of the third layer Z3 is S3=(B+ w3)* δ / 2- S2; Then the cross-sectional area of ​​each row of the pile in the fourth layer Z4 is S4=(B+ w4)* δ / 2- S3; Then the cross-sectional area of ​​each row of the x-th layer Zx is Sx=(B+ wx)* δ / 2- S x-1 .

9. The method for homogenizing multi-row uniformly stacked materials as claimed in claim 6, characterized in that: In step S33, The stockpile volume of the first layer of single-row stockpile is Q1, Q1= S1*X*γ; The stockpile volume of the second layer of single-row stockpile is Q2, Q2= S2*X*γ; The stockpile volume of the third layer of single-row stockpile is Q3, Q3= S3*X*γ; The stockpile quantity of the fourth layer of single-row stockpile is Q4, Q4= S4*X*γ; The amount of material in the single-row pile of the x-th layer is Qx, Qx= Sx*X*γ.

10. The method for homogenizing multi-row uniformly stacked materials as claimed in claim 6, characterized in that: In step S34, The first layer stacking speed is V1, then V1=Q / n / (60* Q1); The second layer stacking speed is V2, then V2=Q / n / (60* Q2); The third layer stacking speed is V3, then V3=Q / n / (60* Q3); The fourth layer stacking speed is V4, then V4=Q / n / (60* Q4); The stacking speed of the xth layer is V x , then Vx=Q / n / (60* Qx).

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