Inspection device for cement manufacturing equipment and operating method for cement manufacturing equipment

Abstract

Its simple structure allows for safe inspection of the condition of deposits inside equipment such as cyclones in cement manufacturing facilities. [Solution] An inspection device for equipment such as a preheater through which cement raw materials are distributed in a cement manufacturing facility, wherein the equipment is provided with an inspection opening for inspecting the inside, and the inspection opening is provided with a first cover that can open and close the inspection opening and through which a second inspection opening smaller in diameter than the inspection opening passes, and a second cover that can open and close the second inspection opening of the first cover.

Description

Technical Field

[0001] The present invention relates to an inspection device for cement manufacturing equipment and an operation method for cement manufacturing equipment.

Background Art

[0002] Conventionally, in cement manufacturing equipment, a preheater is used as equipment for preheating raw materials before being charged into a cement kiln (firing furnace). The preheater is a heat exchange device equipped with multi-stage cyclones, which is configured to bring high-temperature gas discharged from the cement kiln into contact with the cement raw materials to raise the temperature of the cement raw materials and then supply them to the cement kiln.

[0003] In this type of preheater, due to the generation of scale on the inner wall surface of the cyclone during long-term use or the like, cement raw materials may adhere and accumulate, so it is necessary to remove this deposit. Since the removal of deposits may sometimes be carried out during the operation of the preheater, generally, inspection ports communicating with the inside of the cyclone are provided at multiple locations near the wall surface of the cyclone, and an inspection rod may be inserted through these inspection ports for inspection. In this case, the inspection ports are often provided with an inner diameter that is several times larger than the outer diameter of the inspection rod in order to insert the inspection rod with a margin.

[0004] Since it is necessary to close the inspection ports except during inspections such as during the operation of the preheater, lids are provided on the inspection ports so as to be openable and closable via hinges or the like. When performing inspections, the lid is opened to open the inspection port, and internal inspections and the like are carried out from this inspection port as described above.

[0005] On the other hand, as an apparatus for removing deposits inside a cyclone, for example, Patent Document 1 is disclosed. In this preheater deposit removal apparatus, a nozzle for spraying water is arranged in the passage of the cement raw material in the cyclone. In addition, a monitoring means for detecting deposits and a water spraying means for spraying water from the nozzle are provided, and deposits on the inner wall surface are removed by spraying water from the nozzle. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 2-116650 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] In the case of the aforementioned structure where an inspection opening is provided near the wall of the cyclone, if the inspection opening for inserting the inspection rod is too large compared to the rod, the raw materials inside the cyclone are more likely to be blown out from the opening, which poses safety and other problems.

[0008] On the other hand, Patent Document 1 has the problem of a complex structure because devices such as water nozzles and monitors are installed on the cyclone to remove deposits. In addition, although there is a hole for inserting the water nozzle, it is difficult to check the inside through this hole.

[0009] This invention has been made in view of these circumstances, and aims to safely inspect the condition of deposits inside equipment such as cyclones in cement manufacturing facilities with a simple structure. [Means for solving the problem]

[0010] The present invention relates to an inspection device for equipment through which cement raw materials are distributed in a cement manufacturing facility, wherein the equipment is provided with an inspection opening for inspecting the inside, and the inspection opening is provided with a first cover through which a second inspection opening smaller in diameter than the inspection opening is passed, which can open and close the inspection opening, and a second cover which can open and close the second inspection opening of the first cover.

[0011] In this cement manufacturing equipment inspection device, a second inspection opening smaller in diameter than the first inspection opening is provided on the first cover, and a second cover is further provided to open and close this second inspection opening. By opening this second cover, it becomes possible to inspect the inside of the equipment from the outside of the first cover through the second inspection opening without opening the first cover. In this case, the inside of the equipment can be inspected by inserting an inspection rod through the second inspection opening, and during the inspection, the large-diameter inspection opening is blocked by the first cover, so it is possible to prevent the blowing out of deposited material inside the equipment.

[0012] On the other hand, opening the first cover reveals a large-diameter inspection port, allowing for a wide-ranging inspection of the equipment's interior through this port. Therefore, during equipment operation, the second cover can be opened to inspect through the smaller-diameter second inspection port, and when the equipment is stopped, the first cover can be opened to inspect the interior through the large-diameter inspection port. Furthermore, since the second inspection opening provided on the first cover is opened and closed by the second cover, the installation space required is smaller compared to the case where two inspection openings are provided separately, and since it is not necessary to create two holes in the equipment, a reduction in the strength of the equipment can be suppressed.

[0013] In the present invention, the device is a cyclone that constitutes a preheater, and it is preferable that the inspection port is provided at its lower part. The cyclone has a conical cone section or tubular chute section at its lower end that gradually narrows in diameter as it goes downwards, and cement raw materials pass through its interior, making it prone to clogging. By providing an inspection port at the bottom of the cyclone, inspection work is made easier, and the double lid prevents the ejection of red-hot raw materials from the inspection port, allowing for safe inspection.

[0014] Furthermore, the method for operating the cement manufacturing equipment of the present invention is a method for operating the cement manufacturing equipment using an inspection device for the cement manufacturing equipment, wherein the second cover is opened and the inside of the equipment is inspected through the second inspection port while the equipment is in operation, and the first cover is opened and the inside of the equipment is inspected through the inspection port while the equipment is stopped. [Effects of the Invention]

[0015] According to the present invention, the simple structure with a double lid makes it possible to safely inspect and remove deposits inside equipment such as cyclones in cement manufacturing facilities. [Brief explanation of the drawing]

[0016] [Figure 1] This is a schematic diagram showing one embodiment of a cement manufacturing facility. [Figure 2] This is a schematic diagram showing the cyclone in Figure 1. [Figure 3] This is a cross-sectional view showing one embodiment of the inspection device of the present invention. [Figure 4] Figure 3 is a perspective view showing the blocked state of the inspection port of the inspection device. [Figure 5] Figure 3 is a perspective view showing the inspection device with its second inspection port open. [Modes for carrying out the invention]

[0017] Embodiments of the present invention will be described below with reference to the drawings.

[0018] Figure 1 shows an embodiment of cement manufacturing equipment. This cement manufacturing equipment 1 includes a raw material storage warehouse 2 that stores limestone, clay, silica, iron raw materials, etc. as cement raw materials individually, a raw material mill and dryer 3 that pulverizes and dries these cement raw materials, a preheater 4 that preheats the powdery cement raw materials obtained by this raw material mill, a cement kiln 5 that fires the cement raw materials preheated by the preheater 4, a clinker cooler 6 for cooling the cement clinker after firing in the cement kiln 5, and so on.

[0019] The cement kiln 5 is a horizontally placed cylindrical rotary kiln that is slightly inclined downward from the kiln tail part 7 towards the kiln front part 8 and rotates around its axis. And the cement raw materials in the raw material storage warehouse 2 are pulverized and dried by the raw material mill and dryer 3, sent to the preheater 4, and supplied to the kiln tail part 7 of the cement kiln 5 in a preheated state. In the cement kiln 5, while sending the cement raw materials supplied to the kiln tail part 7 towards the kiln front part 8, in the process of sending them, they are heated and fired to about 1450°C by a burner 9 such as a pulverized coal burner on the kiln front part 8 side to generate cement clinker, and this cement clinker is sent out from the kiln front part 8 to the clinker cooler 6. The cement clinker is sent to the finishing process after being cooled to a predetermined temperature by the clinker cooler 6.

[0020] A calciner 10 is provided in front of the aforementioned cement kiln 5, and by this calciner 10, a part of the cement raw materials preheated by the preheater 4 is heated and sent to the cement kiln 5.

[0021] On the other hand, the exhaust gas generated in the cement kiln 5 is introduced into the raw material mill and dryer 3 after passing through the preheater 4 from below to above. The raw material mill and dryer 3 simultaneously perform the pulverization and drying of the cement raw materials when the exhaust gas from the cement kiln 5 is introduced. The exhaust gas from this raw material mill and dryer 3 is discharged into the atmosphere from the chimney 12 as shown by the arrow in Figure 1 via an electric dust collector 11.

[0022] The preheater 4 is composed of multiple cyclones 20 arranged in a multi-stage configuration in the vertical direction. In this embodiment, the equipment through which cement raw materials flow corresponds to the cyclones. In this preheater 4, as mentioned above, exhaust gas from the cement kiln 5 flows from the lower cyclone 20 to the upper cyclone 20, while cement raw materials flow from the upper cyclone 20 to the lower cyclone 20 and are supplied to the cement kiln 5 from the lowest cyclone 20. In addition, some of the cement raw materials are heated by the calcination furnace 10 connected to some of the cyclones 20 before being supplied to the cement kiln 5.

[0023] As shown in Figure 2, each cyclone 20 constituting this preheater 4 has a cylindrical body 21 to which a roughly conical cone 22 is connected, and a tubular chute 23 is connected to the lower end of the cone 22. A blockage detector 24 using a flow sensor or the like is provided at the lower end of the cone 22, and a flap damper 25 is provided on the chute 23. The flap damper 25 can detect blockages by detecting vibrations caused by the flow of cement material hitting the flap plate.

[0024] Because the cone section 22 and chute section 23 of such a cyclone 20 are prone to clogging with cement raw materials, multiple inspection devices 30 are provided in addition to the clogging detectors 24 and flap dampers 25. These inspection devices 30 are configured to open and close holes (inspection ports) 32 in cylindrical bodies 31 attached to cone sections 22 and chute sections 23 using covers 33 and 34. As shown in detail in Figures 3 to 5, these covers 33 and 34 have a double structure consisting of a first cover 33 and a second cover 34. The cylindrical body 31 is fixed to the side of the cyclone 20 at a point prone to clogging by welding or the like, and the internal space of the cylindrical body 31 is formed as an inspection port 32 that communicates with the inside of the cyclone 20. This inspection port 32 is formed to have a diameter of, for example, about 100 mm to 110 mm.

[0025] The first cover 33 is formed in a disc shape with a larger diameter than the inspection opening 32 formed by the cylindrical body 31, and a second inspection opening 35, which has a smaller diameter than the inspection opening 32, passes through its center. This second inspection opening 35 is formed to have a diameter of, for example, about 30 mm. The second cover 34 is formed in a disc shape with a larger diameter than the second inspection opening 35 of the first cover 33, in order to open and close the second inspection opening 35 of the first cover 33, but with a smaller diameter than the first cover 33.

[0026] A bracket 41, integrally provided on the first lid 33 and extending radially outward, is rotatably supported on the side surface of the cylindrical body 31 via a hinge portion 42. Furthermore, on the first lid 33, a pin-shaped portion 43 projecting radially is integrally provided on the side opposite the hinge portion 42 in the radial direction. On the other hand, the second lid 34 is attached to an arm member 45 that is rotatably supported on the side of the cylindrical body 31 via a hinge portion 44. This arm member 45 is formed to a length that can traverse the cylindrical body 31 in the radial direction, and the second lid 34 is held at its center in the longitudinal direction by an axis 46. Thus, the second lid 34 is rotatably supported with respect to the arm member 45. The hinge portion 42 of the first lid 33 and the hinge portion 44 of the second lid 34 are positioned at an appropriate angle (for example, 90°) with respect to the circumferential direction of the cylindrical body 31 so as not to interfere with each other's opening and closing operations.

[0027] On the other hand, a locking mechanism 51 for securing the corresponding lids 33 and 34 is provided on the side of the cylindrical body 31 that is radially opposite to each hinge portion 42 and 44. The first lid 33 is provided with a locking mechanism 51 that locks its pin-shaped portion 43. This locking mechanism 51 comprises a hook member 54 that is rotatably attached to the side of the cylindrical body 31 via a hinge portion 53, and a screw member 55 that presses the tip of the pin-shaped portion 43 that is locked to the hook member 54. Reference numeral 59 indicates a handle portion for operating the screw member 55.

[0028] The hook member 54 is formed as a rectangular prism of a predetermined length, and a groove-shaped portion 56 is formed from one end along its length, penetrating through the thickness direction perpendicular to the length, thereby connecting the ends of a pair of legs 57 by a connecting portion 58, forming a gate shape or a roughly inverted U shape. The tips of both legs 57 are supported on the side of the cylindrical body 31 via hinge portions 53. A screw member 55 is screwed into the connecting portion 58 so as to extend along the length of the groove-shaped portion 56.

[0029] Then, with the first lid 33 closed, the pin-shaped portion 43 can be inserted into the groove-shaped portion 56 while raising the hook member 54 (positioning both legs 57 along the length of the cylindrical body 33), and the screw member 55 can be screwed in to hold the pin-shaped portion 43 in place and fix the first lid 33 in a pressed position against the cylindrical body 31. In this case, the groove-shaped portion 56 of the hook member 54 is designed so that when the pin-shaped portion 43 of the first lid 33 is inserted with the hook member 54 raised, a space is secured between the pin-shaped portion 43 and the connecting portion 58. For this reason, by retracting the tip of the screw member 55 from the groove-shaped portion 56, the groove-shaped portion 56 is formed long enough so that the pin-shaped portion 43 can be positioned within the groove-shaped portion 56 without colliding with the connecting portion 58 when the hook member 54 is rotated via the hinge portion 53. The arrows in Figure 3 indicate the rotation direction of the locking mechanism 51 and the rotation direction of the first cover 33 when opening the first cover 33.

[0030] The locking mechanism 51 for the second lid 34 is a similar mechanism, in which the tip of the arm member 45 to which the second lid 34 is attached is inserted into the grooved portion 56, and the screw member 55 is screwed in to press down on the arm member 45, thereby fixing the second lid 34.

[0031] Then, with the lids 33 and 34 fixed in a closed state by the locking mechanism 51, the screw member 55 of the locking mechanism 51 that locks the second lid 34 is loosened, and the tip of the screw member 55 is retracted from between the arm member 45 of the second lid 34 and the connecting portion 58 of the hook member 54, thereby allowing the second lid 34 to rotate via the hinge portion 44. Then, with the second lid 34 in this open state, the screw member 55 of the locking mechanism 51 that locks the first lid 33 is loosened, and the tip of the screw member 55 is retracted from between the pin-shaped portion 43 of the first lid 33 and the connecting portion 58 of the hook member 54, thereby allowing the first lid 33 to rotate via the hinge portion 42. When the second cover 34 is locked by the locking mechanism 51, even if the locking mechanism 51 on the first cover 33 is released, the first cover 33 cannot be opened because the second cover 34 is positioned on top of the first cover 33 and the arm member 45 of the second cover 34 is locked by the locking mechanism 51.

[0032] In the cement manufacturing facility 1 having the inspection device 30 configured in this way, when inspecting the cyclone 20 during normal operation, as shown in Figure 5, the second inspection port 35 is opened by opening the second cover 34 of the inspection device 30, so the inside can be inspected by inserting the inspection rod 61 into the second inspection port 35 as shown by the dashed line in the same figure. The inspection rod 61 is formed in a tubular shape and can remove dust and other debris accumulated inside the cyclone 20 by blowing air or the like into it. With the second cover 34 open, the first cover 33 remains locked in a closed state by the locking mechanism 51, so the cylindrical body 31 does not open wide, ensuring safety.

[0033] On the other hand, with the cyclone 20 stopped, opening the first cover 33 together with the second cover 34 opens the inspection port 32 of the cylindrical body 31, allowing inspection work such as visually inspecting the inside of the cyclone 20 through this large-diameter inspection port 32. In this way, by using the first cover 33 and the second cover 34 depending on the inspection content, inspection work can be carried out while ensuring the safe operation of the cement manufacturing equipment 1.

[0034] It should be noted that the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the invention. In the above embodiment, the inspection device was designed for the cyclone 20, but this inspection device may also be provided for equipment other than cyclones through which cement raw materials pass. Furthermore, the detailed structure does not necessarily have to be the one described above; for example, the hook member may be a single leg with its tip bent into a hook shape. Furthermore, the two lids do not necessarily have to be supported by hinges; both lids may be removable from the cylindrical body as long as the first lid can open and close the inspection opening, and the second lid can open and close the second inspection opening formed in the first lid. [Explanation of Symbols]

[0035] 1. Cement manufacturing facilities 2. Raw material storage 3. Raw material mill and dryer 4 Preheater 5. Cement Kiln 6. Clinka Cooler 7. Kiln bottom 8. Front of the kiln 9 burners 10 Temporary Firing Furnace 20 Cyclone 21 Torso 22 Cone section 23 Shooter Club 24 detectors 25 Flap Damper 30 Inspection device 31 Cylinder 32 Inspection hatches 33 The first lid 34. The second lid 35 Second inspection hatch 41 Bracket 42, 44, 53 Hinge section 43 Pin-shaped part 45 Arm member 46 axes 51 Locking mechanism 54 Hook member 55 Screw member 56 Groove 57 Legs 58 Connecting part 61 Inspection rod

Claims

1. An inspection device for equipment through which cement raw materials are distributed in a cement manufacturing facility, characterized in that the equipment is provided with an inspection opening for inspecting the inside, and the inspection opening is provided with a first cover through which a second inspection opening smaller in diameter than the inspection opening is passable and which can open and close the inspection opening, and a second cover which can open and close the second inspection opening of the first cover.

2. The inspection device for cement manufacturing equipment according to claim 1, characterized in that the equipment is a cyclone constituting a preheater, and the inspection port is provided at its lower part.

3. A method for operating cement manufacturing equipment using the inspection device for cement manufacturing equipment described in claim 1 or 2, characterized in that the second cover is opened and the inside of the equipment is inspected through the second inspection port while the equipment is in operation, and the first cover is opened and the inside of the equipment is inspected through the inspection port while the equipment is stopped.

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