Vertical mill

Abstract

To efficiently grind a material to be ground.SOLUTION: A vertical type mill 100 comprises: a rotary table 120; a roller body 132 arranged above the rotary table 120; a pressure device 140 for pressing the roller body 132 to a rotary table 120 side; and a roller control part 182 which exclusively implements pressure control for driving the pressure device 140 to control pressurization pressure to the rotary table 120 side using the roller body 132, and distance control for controlling a distance between the rotary table 120 and the roller body 132.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a vertical mill.

Background Art

[0002] Conventionally, vertical mills for pulverizing materials to be pulverized such as coal, biomass, and cement raw materials have been widespread (for example, Patent Document 1). A vertical mill includes a rotating table, a roller body, and a pressurizing device. In a vertical mill, the material to be pulverized is guided between the rotating table and the roller body, and the roller body is pressed toward the rotating table side by the pressurizing device. The material to be pulverized on the rotating table is crushed and pulverized by the roller body.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above vertical mill, regardless of the type of the material to be pulverized, development of a technology capable of efficiently pulverizing the material to be pulverized is desired.

[0005] Therefore, in view of such problems, an object of the present disclosure is to provide a vertical mill capable of efficiently pulverizing a material to be pulverized.

Means for Solving the Problems

[0006] To solve the above problems, a vertical mill according to one aspect of the present disclosure comprises a rotary table, a plurality of roller bodies arranged above the rotary table, a pressurizing device that pressurizes each of the plurality of roller bodies toward the rotary table, a roller control unit that exclusively performs pressurizing control, which drives the pressurizing device to control the pressurizing pressure applied toward the rotary table by the roller bodies and grinds the material to be ground by the roller bodies, and distance control, which drives the pressurizing device to control the distance between the rotary table and the roller bodies and grinds the material to be ground by the roller bodies, wherein the roller control unit performs distance control on any one of the other roller bodies when pressurizing control is being performed on at least one roller body. Also, above Record The type mill is ,times An opening above the turning table, through which a supply pipe for solid fuel passes. ,times The solid fuel, crushed by the turning table and roller body, is guided to the boiler that makes up the power generation equipment via a discharge pipe. ,of The roller control unit performs distance control according to the load of the power generation equipment that makes up the power generation facility. You can . Furthermore, the roller control unit performs distance control to achieve a target distance determined according to the load of the power generation device, and the target distance may be set to be larger the greater the load of the power generation device.

[0007] Furthermore, the above vertical mill is ,B The roller control unit may perform pressure control so that the execution time of pressure control for each of the multiple roller bodies is approximately equal.

[0008] Furthermore, the above vertical mill is ,B The roller control unit may perform pressure control such that the cumulative execution time of the pressure control for each of the multiple roller bodies is approximately equal.

[0009] Furthermore, the above vertical mill is ,B The roller control unit may perform distance control such that the execution time for distance control of each of the multiple roller bodies is approximately equal.

[0010] Furthermore, the above vertical mill is ,BThe roller control unit may perform distance control such that the cumulative execution time of distance control for each of the multiple roller bodies is approximately equal.

[0012] Furthermore, the roller control unit may perform pressure control and distance control on multiple roller bodies in a predetermined order.

[0013] Furthermore, the vertical mill described above includes a supply pipe that opens above the rotating table and through which solid fuel passes, and a discharge pipe that guides the solid fuel crushed by the rotating table and roller body to a boiler that constitutes the power generation equipment, and the roller control unit may perform pressurization control according to the load of the power generation equipment that constitutes the power generation equipment. [Effects of the Invention]

[0015] According to this disclosure, it becomes possible to efficiently pulverize the material to be pulverized. [Brief explanation of the drawing]

[0016] [Figure 1] Figure 1 is a schematic diagram of a vertical mill according to this embodiment. [Figure 2] Figure 2 is a diagram illustrating the pressurizing device and roller control unit according to the embodiment. [Figure 3] Figure 3 illustrates the control sequence by the roller control unit. [Modes for carrying out the invention]

[0017] Embodiments of this disclosure will be described in detail below with reference to the attached drawings. The dimensions, materials, and other specific numerical values ​​shown in the embodiments are merely examples for the purpose of facilitating understanding and do not limit this disclosure unless otherwise specified. In this specification and in the drawings, elements having substantially the same function or configuration are denoted by the same reference numerals to avoid redundant explanations. Elements not directly related to this disclosure are omitted from the illustrations.

[0018] [Vertical Mill 100] Figure 1 is a schematic view of the vertical mill 100 according to the present embodiment. In Figure 1, the solid arrows indicate the flow of the material to be pulverized. Also, in Figure 1, the dashed arrows indicate the flow of the gas.

[0019] As shown in Figure 1, the vertical mill 100 includes a casing 110, a rotating table 120, a plurality of roller units 130, a plurality of pressurizing devices 140, a supply pipe 150, a classifier 160, a discharge pipe 170, and a central control unit 180. In Figure 1, for ease of understanding, only one roller unit 130 and one pressurizing device 140 are shown, and the other roller units 130 and pressurizing devices 140 are omitted.

[0020] A rotating table 120 is provided inside the casing 110 of the vertical mill 100. The rotating table 120 is in a disk shape. The rotating table 120 is provided inside the casing 110 such that the rotation axis is in the vertical direction. The rotating table 120 is rotated by a table drive motor 124 via a speed reducer 122. The rotating table 120 is rotated at a constant speed or a variable speed by the table drive motor 124.

[0021] Concave grooves 126 are formed on the upper surface of the rotating table 120. The concave grooves 126 are annular grooves centered on the rotation axis of the rotating table 120. The vertical cross-section of the concave grooves 126 passing through the rotation axis of the rotating table 120 is in an arc shape.

[0022] A plurality of (for example, three) roller units 130 are provided. The roller unit 130 includes a roller body 132, a roller shaft 134, a bracket 136, and a pivot shaft 138. The roller body 132 is disposed obliquely above the concave groove 126 of the rotating table 120. The greater the amount of the material to be pulverized guided to the concave groove 126, the smaller the inclination of the roller body 132 (approaching the horizontal direction), and the smaller the amount of the material to be pulverized guided to the concave groove 126, the greater the inclination of the roller body 132.

[0023] In this embodiment, the three roller bodies 132 are arranged radially at 120° intervals from the rotation center of the rotary table 120. The roller bodies 132 are supported by bearings (not shown) attached to the roller shafts 134. The roller shafts 134 are inserted through a bracket 136. In addition to the roller shafts 134, a pivot shaft 138 is also inserted through the bracket 136. The pivot shaft 138 is supported by bearings (not shown).

[0024] Each roller unit 130 is provided with a corresponding pressurizing device 140. In this embodiment, the vertical mill 100 has three roller units 130, so three pressurizing devices 140 are provided. As will be described in more detail later, the pressurizing device 140 includes an actuator (e.g., a hydraulic cylinder). The pressurizing device 140 pressurizes the roller body 132 toward the rotary table 120. In this embodiment, the pressurizing device 140 presses the receiving seat 136a formed on the bracket 136. This applies a load to the receiving seat 136a. As a result, the bracket 136 swings with the pivot axis 138 as the center of rotation. The roller body 132 swings together with the bracket 136 and is pressed (pressurized) toward the rotary table 120 below.

[0025] The supply pipe 150 opens above the rotary table 120. The material to be crushed is supplied from outside the casing 110 through the supply pipe 150 onto the rotary table 120. The material to be crushed is, for example, solid fuel such as coal or biomass. The biomass is, for example, one or more of the following: woody biomass, herbaceous biomass, and waste biomass. Woody biomass includes, for example, wood, sawdust, and bark. Herbaceous biomass includes, for example, sugarcane, sorghum, bamboo, wheat straw, and rice straw. Waste biomass includes, for example, empty fruit bunches (EFB) and palm kernel shells (PKS) resulting from the production of palm oil from palm trees.

[0026] The material to be crushed, supplied to the rotary table 120, is caught between the groove 126 of the rotary table 120 and the roller body 132. As the rotary table 120 rotates, the caught material is crushed and pulverized by the roller body 132.

[0027] An air outlet 128 is formed on the radially outer side of the rotary table 120. The crushed material is lifted by the air ejected from the outlet 128 (airflow conveying). The lifted material flows into the classifier 160.

[0028] The classifier 160 classifies the material to be crushed. The material with relatively larger particle sizes, classified by the classifier 160, falls onto the rotating table 120 and is crushed again by the roller body 132. On the other hand, the material with relatively smaller particle sizes, classified by the classifier 160, is led to the discharge pipe 170.

[0029] The discharge pipe 170 guides the crushed material (solid fuel) crushed by the rotary table 120 and roller body 132 to the boiler 12 that constitutes the power generation equipment 10.

[0030] The power generation facility 10 includes a boiler 12 and a power generation device 14. The boiler 12 burns solid fuel to produce steam. The power generation device 14 converts the energy contained in the steam produced by the boiler 12 into electricity (power generation).

[0031] The central control unit 180 is composed of a semiconductor integrated circuit including a CPU (Central Processing Unit). The central control unit 180 reads programs and parameters for operating the CPU itself from ROM. The central control unit 180 works in cooperation with RAM, which serves as the work area, and other electronic circuits to manage and control the entire vertical mill 100.

[0032] In this embodiment, the central control unit 180 functions as a roller control unit 182. The roller control unit 182 exclusively performs pressure control and distance control for one roller body 132. Pressure control involves driving the pressure device 140 to control the pressure applied by the roller body 132 toward the rotary table 120. Distance control involves controlling the distance between the rotary table 120 (groove 126) and the roller body 132.

[0033] Figure 2 is a diagram illustrating the pressurizing device 140 and roller control unit 182 according to this embodiment. In Figure 2, solid arrows indicate the flow of hydraulic fluid. In Figure 2, dashed arrows indicate the flow of signals.

[0034] As shown in Figure 2, the pressurizing device 140 includes a hydraulic cylinder 210, a first oil passage 220, a second oil passage 222, a control valve 230, switching valves 240 and 242, pressure sensors 250 and 252, and a position sensor 260.

[0035] The hydraulic cylinder 210 includes a cylinder 212, a piston 214, and a piston rod 216. The piston 214 is slidably mounted within the cylinder 212. The piston 214 divides the inside of the cylinder 212 into a first chamber 212a and a second chamber 212b. The piston rod 216 is mounted on the piston 214. The piston rod 216 is positioned in the second chamber 212b and outside the cylinder 212. The tip 216a of the piston rod 216 abuts against the seat 136a.

[0036] The first oil passage 220 connects the control valve 230 to the first chamber 212a. The second oil passage 222 connects the control valve 230 to the second chamber 212b.

[0037] The control valve 230 switches the flow of hydraulic fluid between a first state and a second state. In the first state, hydraulic fluid supplied from the hydraulic system 300 is supplied to the first oil passage 220 (first chamber 212a), and hydraulic fluid sent from the second oil passage 222 (second chamber 212b) is returned to the hydraulic system 300. In the first state, the piston 214 moves to the right in Figure 2, and the pressing pressure of the piston rod 216 on the seat 136a increases. As a result, the pressurizing pressure of the roller body 132 toward the rotary table 120 increases.

[0038] The second state is one in which hydraulic fluid supplied from the hydraulic system 300 is supplied to the second oil passage 222 (second chamber 212b), and hydraulic fluid sent from the first oil passage 220 (first chamber 212a) is returned to the hydraulic system 300. In the second state, the piston 214 moves to the left in Figure 2, and the pressing pressure of the piston rod 216 on the receiving seat 136a decreases. As a result, the pressurizing pressure of the roller body 132 toward the rotary table 120 decreases.

[0039] A switching valve 240 is provided in the first oil passage 220. The switching valve 240 opens and closes the first oil passage 220. A switching valve 242 is provided in the second oil passage 222. The switching valve 242 opens and closes the second oil passage 222.

[0040] Pressure sensor 250 detects the pressure between the switching valve 240 and the first chamber 212a in the first oil passage 220. Pressure sensor 252 detects the pressure between the switching valve 242 and the second chamber 212b in the second oil passage 222.

[0041] The position sensor 260 detects the position of the piston 214.

[0042] When pressurization control is performed, the roller control unit 182 first opens the switching valves 240 and 242. Based on the values ​​detected by the pressure sensors 250 and 252, the roller control unit 182 detects the pressurizing pressure applied to the rotary table 120 by the roller body 132. Then, the roller control unit 182 controls the control valve 230 so that the pressurizing pressure applied to the rotary table 120 by the roller body 132 reaches the target pressure.

[0043] The target pressure is determined based on the properties (type) of the material to be pulverized (solid fuel). Furthermore, the roller control unit 182 may vary the target pressure according to the load of the power generation device 14. Specifically, when the load of the power generation device 14 is high, the amount of solid fuel supplied from the supply pipe 150 onto the rotary table 120 increases. Therefore, the roller control unit 182 increases the target pressure. On the other hand, when the load of the power generation device 14 is low, the amount of solid fuel supplied from the supply pipe 150 onto the rotary table 120 decreases. Therefore, the roller control unit 182 decreases the target pressure. In other words, the roller control unit 182 may vary the target pressure according to the amount of solid fuel supplied.

[0044] When performing distance control, the roller control unit 182 first opens the switching valves 240 and 242. Based on the values ​​detected by the position sensor 260, the roller control unit 182 detects the distance between the rotary table 120 and the roller body 132. Then, the roller control unit 182 controls the control valve 230 so that the distance between the rotary table 120 and the roller body 132 becomes the target distance. Once the distance between the rotary table 120 and the roller body 132 becomes the target distance, the roller control unit 182 closes the switching valves 240 and 242.

[0045] The target distance is determined based on the properties (type) of the material to be pulverized (solid fuel). The roller control unit 182 may also vary the target distance according to the load of the power generation device 14. Specifically, when the load of the power generation device 14 is high, the amount of solid fuel supplied from the supply pipe 150 onto the rotary table 120 increases. Therefore, the roller control unit 182 increases the target distance. On the other hand, when the load of the power generation device 14 is low, the amount of solid fuel supplied from the supply pipe 150 onto the rotary table 120 decreases. Therefore, the roller control unit 182 decreases the target distance. In other words, the roller control unit 182 may vary the target distance according to the amount of solid fuel supplied.

[0046] Furthermore, in this embodiment, the roller control unit 182 performs pressure control so that the execution time of pressure control for each of the multiple roller bodies 132 is approximately equal. In other words, the roller control unit 182 performs distance control so that the execution time of distance control for each of the multiple roller bodies 132 is approximately equal. In addition, the roller control unit 182 performs pressure control and distance control on the multiple roller bodies 132 in a predetermined order, and when pressure control is being performed on at least one roller body 132, distance control is performed on any one of the other roller bodies 132.

[0047] Figure 3 illustrates the control sequence by the roller control unit 182. As shown in Figure 3, in the first period, the roller control unit 182 applies pressure control to roller body No. 1 and roller body No. 2 of the three roller bodies 132, and applies distance control to roller body No. 3 132. In the second period following the first period, the roller control unit 182 applies pressure control to roller body No. 2 and roller body No. 3 132, and applies distance control to roller body No. 1 132. In the third period following the second period, the roller control unit 182 applies pressure control to roller body No. 1 and roller body No. 3 132, and applies distance control to roller body No. 2 132. The roller control unit 182 then repeats the processing units from the first to the third period. Note that the first, second, and third periods are substantially equal in length.

[0048] Furthermore, focusing on roller body 132 No. 1, the roller control unit 182 repeatedly processes roller body 132 No. 1 in the order of pressure control, distance control, and pressure control. Similarly, focusing on roller body 132 No. 2, the roller control unit 182 repeatedly processes roller body 132 No. 2 in the order of pressure control, pressure control, and distance control. Focusing on roller body 132 No. 3, the roller control unit 182 repeatedly processes roller body 132 No. 3 in the order of distance control, pressure control, and pressure control.

[0049] Furthermore, focusing on distance control, the roller control unit 182 repeatedly performs distance control on the roller body 132 No. 3, the roller body 132 No. 1, and the roller body 132 No. 2 in that order.

[0050] In other words, the control sequence is the same for each roller body 132, but the timing of the pressure control and distance control differs between the roller bodies 132.

[0051] As described above, the vertical mill 100 according to this embodiment is equipped with a roller control unit 182 that performs pressure control and distance control. If only pressure control is performed, softer materials to be pulverized, such as biomass, will not get caught between the roller body 132 and the rotary table 120, resulting in reduced pulverization efficiency. In contrast, the roller control unit 182 according to this embodiment performs distance control in addition to pressure control. This prevents soft materials to be pulverized from getting caught between the roller body 132 and the rotary table 120. Therefore, the vertical mill 100 can efficiently pulverize relatively soft materials to be pulverized, such as biomass, in addition to relatively hard materials to be pulverized, such as coal. In other words, the vertical mill 100 can efficiently pulverize materials regardless of the type of material being pulverized.

[0052] Furthermore, as described above, the roller control unit 182 exclusively performs pressure control and distance control on one roller body 132, and performs pressure control so that the execution time of pressure control for each of the multiple roller bodies 132 is approximately equal. In addition, the roller control unit 182 performs distance control on one roller body 132 so that the execution time of distance control for each of the multiple roller bodies 132 is approximately equal. As a result, the vertical mill 100 can equalize the amount of wear on the multiple roller bodies 132. Therefore, the vertical mill 100 can reduce the maintenance frequency of the multiple roller bodies 132.

[0053] Furthermore, as described above, when the roller control unit 182 is applying pressure control to two roller bodies 132, it constantly performs distance control on the other roller body 132. This allows the vertical mill 100 to always produce a uniform product after grinding.

[0054] Furthermore, as described above, the roller control unit 182 performs pressure control and distance control on multiple roller bodies 132 in a predetermined order, and when pressure control is being performed on at least one roller body 132, distance control is performed on any one of the other roller bodies 132. In other words, the roller control unit 182 rotates the roller body 132 on which pressure control is being performed. To put it another way, the roller control unit 182 rotates the roller body 132 on which distance control is being performed.

[0055] For example, if, among the multiple roller bodies 132, one roller body 132 that is subjected to pressure control and another roller body 132 that is subjected to distance control are fixed, then an uneven distribution of the material being crushed will occur. This can lead to variations in the airflow transport of the material being crushed to the classifier 160, potentially preventing the material from being transported to the discharge pipe 170. In contrast, the roller control unit 182 according to this embodiment performs pressure control and distance control on the multiple roller bodies 132 in a predetermined order, and when pressure control is being performed on at least one roller body 132, distance control is performed on one of the other roller bodies 132. As a result, the vertical mill 100 can avoid an uneven distribution of the material being crushed. Therefore, the vertical mill 100 can transport the material being crushed to the classifier 160 substantially uniformly, and efficiently transport the material to the discharge pipe 170.

[0056] Furthermore, as described above, the roller control unit 182 performs pressure control and distance control according to the load of the power generation device 14. As a result, the vertical mill 100 can efficiently pulverize the material to be pulverized regardless of the amount of material supplied.

[0057] While embodiments have been described above with reference to the attached drawings, it goes without saying that this disclosure is not limited to the embodiments described above. It will be obvious to those skilled in the art that various modifications or alterations can be conceived within the scope of the claims, and these will naturally also fall within the technical scope of this disclosure.

[0058] For example, in the embodiment described above, the roller control unit 182 performed pressure control and distance control on a plurality of roller bodies 132 in a predetermined order. However, the roller control unit 182 does not need to perform pressure control on at least one roller body 132; it is sufficient if it can perform distance control on any one of the other roller bodies 132 while performing pressure control on at least one roller body 132. This allows the vertical mill 100 to always produce a uniform result after grinding. For example, the roller control unit 182 may randomly repeat distance control on roller body 132 No. 1, roller body 132 No. 2, roller body 132 No. 3, roller body 132 No. 3, roller body 132 No. 2, roller body 132, etc.

[0059] Furthermore, in the above embodiment, an example was given in which the roller control unit 182 performs pressure control on at least one roller body 132 and distance control on any one of the other roller bodies 132. However, the roller control unit 182 may perform pressure control or distance control on all roller bodies 132 simultaneously. In any case, the roller control unit 182 only needs to perform pressure control so that the execution time of pressure control for each of the multiple roller bodies 132 is approximately equal. Similarly, the roller control unit 182 only needs to perform distance control so that the execution time of distance control for each of the multiple roller bodies 132 is approximately equal. As a result, the vertical mill 100 can equalize the amount of wear on the multiple roller bodies 132.

[0060] Furthermore, in the above embodiment, an example was given in which the roller control unit 182 performs pressure control so that the execution time of pressure control for each of the multiple roller bodies 132 is approximately equal, and distance control so that the execution time of distance control for each of the multiple roller bodies 132 is approximately equal. However, the roller control unit 182 may perform pressure control so that the execution time of pressure control for each of the multiple roller bodies 132 is different. Similarly, the roller control unit 182 may perform distance control so that the execution time of distance control for each of the multiple roller bodies 132 is different. In any case, it is sufficient for the roller control unit 182 to be able to perform distance control for any one of the other roller bodies 132 while performing pressure control for at least one roller body 132. As a result, the vertical mill 100 can always produce a uniform result after grinding.

[0061] Furthermore, the roller control unit 182 may perform pressure control so that the cumulative execution time of the pressure control for each of the multiple roller bodies 132 is approximately equal. In this case, the vertical mill 100 is equipped with a memory (not shown), which stores the cumulative value of the execution time of the pressure control for each roller body 132. The roller control unit 182 then refers to the cumulative value in the memory and performs pressure control so that the cumulative execution time of the pressure control for each of the multiple roller bodies 132 is approximately equal. As a result, even if one or more of the multiple roller bodies 132 are replaced with new ones, the vertical mill 100 can equalize the amount of wear on all of the multiple roller bodies 132.

[0062] Furthermore, the roller control unit 182 may perform distance control such that the cumulative execution time of distance control for each of the multiple roller bodies 132 is approximately equal. In this case, the vertical mill 100 is equipped with a memory (not shown) that stores the cumulative value of the execution time of distance control for each roller body 132. The roller control unit 182 then refers to the cumulative value in the memory and performs distance control such that the cumulative execution time of distance control for each of the multiple roller bodies 132 is approximately equal. As a result, even if one or more of the multiple roller bodies 132 are replaced with new ones, the vertical mill 100 can equalize the amount of wear on all of the multiple roller bodies 132.

[0063] Furthermore, in the above embodiment, an example was given where the number of roller bodies 132 performing pressure control is greater than the number of roller bodies 132 performing distance control. However, the number of roller bodies 132 performing pressure control may be the same as the number of roller bodies 132 performing distance control, or it may be less than the number of roller bodies 132 performing distance control.

[0064] Furthermore, in the above embodiment, an example was given in which one pressurizing device 140 is provided for each roller unit 130. However, if only one of the multiple roller units 130 is subject to pressurizing control, then one pressurizing device 140 is sufficient for that single roller unit 130. In any case, the pressurizing device 140 only needs to be provided for the roller unit 130 that is subject to pressurizing control.

[0065] Furthermore, in the above embodiment, the roller control unit 182 was shown as an example in which it varies the target pressure according to the load of the power generation device 14. However, the roller control unit 182 does not necessarily have to vary the target pressure.

[0066] In the above embodiment, the roller control unit 182 was shown as an example in which it varies the target distance according to the load of the power generation device 14. However, the roller control unit 182 does not have to vary the target distance.

[0067] Furthermore, in the above embodiment, an example was given in which the vertical mill 100 has multiple roller bodies 132. However, the vertical mill 100 may have only one roller body 132. In any case, the roller control unit 182 only needs to be able to exclusively perform pressure control and distance control for the one roller body 132.

[0068] Furthermore, in the above embodiment, an example was given in which the pressurizing device 140 includes a hydraulic cylinder 210. However, the pressurizing device 140 is not limited in its configuration as long as it can pressurize the roller body 132 toward the rotary table 120. The pressurizing device 140 may, for example, include a motor.

[0069] Furthermore, in the above embodiment, an example was given in which the pressurizing device 140 is equipped with pressure sensors 250 and 252. However, if the roller control unit 182 can acquire the pressurizing pressure, the pressurizing device 140 does not need to be equipped with pressure sensors 250 and 252. For example, the roller control unit 182 may estimate the pressurizing pressure based on the flow rate of hydraulic fluid supplied from the hydraulic device 300, the flow rate of hydraulic fluid returned from the hydraulic cylinder 210, the volume of the first chamber 212a, and the volume of the second chamber 212b.

[0070] Furthermore, in the above embodiment, an example was given in which the pressurizing device 140 is equipped with a position sensor 260. However, if the roller control unit 182 can obtain the distance between the rotary table 120 and the roller body 132, it is not necessary to provide a position sensor 260. For example, the pressurizing device 140 may be equipped with a distance sensor instead of a position sensor 260. The distance sensor detects the distance between the end of the cylinder 212 on the first chamber 212a side or the end on the second chamber 212b side and the piston 214.

[0071] Furthermore, in the above embodiment, the hydraulic system 300 was given as an example in which it supplies hydraulic fluid to a plurality of pressurizing devices 140. However, the hydraulic system 300 may be provided for each of the plurality of pressurizing devices 140.

[0072] Furthermore, in the above embodiment, the case where the material to be pulverized is a solid fuel was given as an example. However, the material to be pulverized can be any solid material. The material to be pulverized may be, for example, cement raw materials, slag, clinker, limestone, etc.

[0073] This disclosure enables the efficient crushing of coal and biomass, and can therefore contribute, for example, to Sustainable Development Goal (SDG) 7, "Ensure access to affordable, reliable, sustainable and modern energy," and Goal 13, "Take urgent action to combat climate change and its impacts." [Explanation of Symbols]

[0074] 100 Vertical Mill 120-degree rotating table 132 Roller body 140 Pressurizing device 150 Supply pipe 170 Discharge pipe 182 Roller Control Unit

Claims

1. A rotating table and Multiple roller bodies are arranged above the aforementioned rotating table, A pressurizing device that pressurizes each of the plurality of roller bodies toward the rotary table, A roller control unit exclusively performs pressure control, which controls the pressure applied by the roller body toward the rotary table side by driving the pressure device, and distance control, which controls the distance between the rotary table and the roller body by driving the pressure device, and performs the pulverization of the material to be pulverized by the roller body. Equipped with, The roller control unit performs the pressure control on at least one of the roller bodies and the distance control on any one of the other roller bodies in a vertical mill.

2. A supply pipe that opens above the rotating table and through which solid fuel passes, A discharge pipe leads the solid fuel, which has been crushed by the rotating table and the roller body, to a boiler that constitutes the power generation equipment. Equipped with, The vertical mill according to claim 1, wherein the roller control unit performs distance control according to the load of the power generation device constituting the power generation equipment.

3. The vertical mill according to claim 2, wherein the roller control unit performs distance control so that the distance becomes a target distance determined according to the load of the power generation device, and the target distance is determined to be larger the greater the load of the power generation device.

4. The roller control unit is A vertical mill according to any one of claims 1 to 3, wherein the pressurization control is performed such that the execution time of the pressurization control for each of the multiple roller bodies is substantially equal.

5. The roller control unit is A vertical mill according to any one of claims 1 to 4, wherein the pressurization control is performed such that the cumulative execution time of the pressurization control for each of the multiple roller bodies is substantially equal.

6. The roller control unit is A vertical mill according to any one of claims 1 to 5, wherein the distance control is performed such that the execution time of the distance control for each of the multiple roller bodies is substantially equal.

7. The roller control unit is A vertical mill according to any one of claims 1 to 6, wherein the distance control is performed such that the cumulative execution time of the distance control for each of the multiple roller bodies is substantially equal.

8. The vertical mill according to any one of claims 1 to 7, wherein the roller control unit performs the pressure control and distance control on a plurality of roller bodies in a predetermined order.

9. An opening above the aforementioned rotating table, through which a supply pipe through which solid fuel passes, A discharge pipe leads the solid fuel, which has been crushed by the rotating table and the roller body, to a boiler that constitutes the power generation equipment. Equipped with, The vertical mill according to any one of claims 1 to 8, wherein the roller control unit performs the pressurization control according to the load of the power generation device constituting the power generation equipment.

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