Cement clinker manufacturing apparatus and dispersion apparatus

Abstract

To disperse cement raw materials while preventing influence on gas flowing through a rising duct.SOLUTION: A production device of cement clinker comprises: a calcination furnace calcinating cement raw materials by using gas containing effluent gas from a rotary kiln; a rising duct connecting the calcination furnace and the rotary kiln and guides effluent gas to the calcination furnace; a raw material injection unit injecting the cement raw materials into the rising duct; and a dispersion component arranged in the inside of the rising duct and dispersing the cement raw materials injected from the injection unit. The dispersion component is structured from multiple bar-type components arranged with intervals.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present disclosure relates to an apparatus for manufacturing cement clinker and a dispersing apparatus.

Background Art

[0002] In an apparatus for manufacturing cement clinker, in order to preheat raw material powder which is a cement raw material, for example, a new suspension preheater (NSP) is used. In this NSP, there are cases where raw material powder is charged into a rising duct connected to a calciner from a cyclone. In this case, if the raw material powder does not disperse in the high-temperature gas in the rising duct, it will fall to the lower part without heat exchange. As a result, there may be problems such as hindering the operation of the chlorine bypass due to the inflow of raw material powder into the air extraction port of the chlorine bypass. Therefore, a dispersing apparatus (for example, see Patent Document 1) for dispersing raw material powder (powder particles) is utilized, and a device for dispersing raw material powder in high-temperature gas has been devised.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The present disclosure provides an apparatus for manufacturing cement clinker and a dispersing apparatus capable of dispersing cement raw materials while suppressing the influence on the gas flowing in the rising duct.

Means for Solving the Problems

[0005] A cement clinker manufacturing apparatus according to one aspect of this disclosure comprises a calcination furnace for calcining cement raw materials with a gas including exhaust gas from a rotary kiln, a rising duct connecting the calcination furnace and the rotary kiln and guiding the exhaust gas to the calcination furnace, a raw material input section for introducing cement raw materials into the rising duct, and a dispersion member arranged inside the rising duct for dispersing the cement raw materials introduced from the raw material input section. The dispersion member is composed of a plurality of rod-shaped members arranged at intervals.

[0006] In this manufacturing apparatus, cement raw materials introduced from the raw material input section are dispersed by multiple rod-shaped members arranged at intervals. Since spaces are provided between the multiple rod-shaped members, the degree to which the flow of exhaust gas in the rising duct is obstructed by the dispersion members is reduced. Therefore, it is possible to disperse the cement raw materials while suppressing the impact on the gas flowing in the rising duct.

[0007] Each of the multiple rod-shaped members may be rotatable around an axis along the extending direction of the rod-shaped member. In this case, rotating the rod-shaped members makes it difficult for exhaust gas to form a coating on the rod-shaped members, and makes it difficult for cement raw materials to accumulate on the rod-shaped members. As a result, it becomes possible to suppress the impact on gas caused by accumulated material on the rod-shaped members.

[0008] A cement clinker manufacturing apparatus according to one aspect of this disclosure comprises a calcination furnace for calcining cement raw materials with a gas including exhaust gas from a rotary kiln, a rising duct connecting the calcination furnace and the rotary kiln and guiding the exhaust gas to the calcination furnace, a raw material input section for introducing cement raw materials into the rising duct, and a dispersion member disposed inside the rising duct for dispersing the cement raw materials introduced from the raw material input section. The dispersion member is composed of a plate-shaped member having a plurality of notches formed therein.

[0009] In this manufacturing apparatus, cement raw materials introduced from the raw material input section are dispersed by a plate-shaped member with multiple notches. Because spaces are formed by the multiple notches, the degree to which the flow of exhaust gas in the rising duct is obstructed by the dispersion member is reduced. Therefore, it is possible to disperse the cement raw materials while suppressing the impact on the gas flowing in the rising duct.

[0010] The dispersion member is formed to extend in one direction and may be provided to be movable along the direction of its extension. In this case, the amount of cement raw material dispersed can be adjusted by changing the position of the dispersion member. As a result, the amount of dispersion can be adjusted according to the operating conditions of the manufacturing equipment.

[0011] A dispersion device relating to one aspect of this disclosure is a device that connects a calcination furnace, which calcines cement raw materials with gas including exhaust gas from a rotary kiln, to a rotary kiln, and disperses the cement raw materials introduced into a rising duct that leads the exhaust gas to the calcination furnace. This dispersion device comprises a plurality of rod-shaped members arranged at intervals. In this dispersion device, similar to the cement clinker manufacturing device described above, it is possible to disperse the cement raw materials while suppressing the influence on the gas flowing in the rising duct.

[0012] A dispersion device relating to one aspect of this disclosure is a device that connects a calcination furnace, which calcines cement raw materials with gas including exhaust gas from a rotary kiln, to a rotary kiln, and disperses the cement raw materials introduced into a rising duct that guides the exhaust gas to the calcination furnace. This dispersion device comprises a plate-shaped member with a plurality of notches formed therein. In this dispersion device, similar to the cement clinker manufacturing device described above, it is possible to disperse the cement raw materials while suppressing the influence on the gas flowing in the rising duct. [Effects of the Invention]

[0013] According to this disclosure, a cement clinker manufacturing apparatus and a dispersion apparatus are provided that can disperse cement raw materials while suppressing the impact on gas flowing in a rising duct. [Brief explanation of the drawing]

[0014] [Figure 1] Figure 1 is a schematic diagram showing an example of a cement clinker manufacturing apparatus. [Figure 2] Figure 2 is a schematic side view showing an example of a distributed device and its surroundings. [Figure 3] Figure 3(a) is a schematic perspective view showing an example of a dispersion member. Figure 3(b) is a schematic side view showing an example of a dispersion member. [Figure 4] Figures 4(a) and 4(b) are schematic top views showing an example of a dispersed member. [Modes for carrying out the invention]

[0015] The embodiments will be described below with reference to the drawings. In the description, identical elements or elements with the same function will be denoted by the same reference numeral, and redundant explanations will be omitted. Furthermore, unless otherwise specified, positional relationships such as up, down, left, and right will be based on the positional relationships shown in the drawings. Moreover, the dimensional ratios of each element are not limited to those shown in the drawings.

[0016] [Cement clinker manufacturing equipment] Figure 1 schematically shows a cement clinker manufacturing apparatus according to one embodiment. The manufacturing apparatus 1 is an apparatus that manufactures cement clinker by firing cement raw materials. Cement raw materials, which are in the form of powder, are supplied to the manufacturing apparatus 1. The manufacturing apparatus 1 includes, for example, a preheating and calcination section 10, a rotary kiln 30, and a clinker cooler 60.

[0017] The preheating and calcining section 10 is a device that preheats and calcines cement raw materials using high-temperature gas for heating (hereinafter simply referred to as "high-temperature gas") before firing in the rotary kiln 30. The high-temperature gas includes the exhaust gas generated in the rotary kiln 30. The high-temperature gas has a temperature sufficient to preheat and calcine the cement raw materials. The preheating and calcining section 10 has four cyclones C1, C2, C3, C4, gas ducts 14a, 16a, 18a, and chutes 14b, 16b, 18b. The four cyclones C1, C2, C3, C4 are arranged in this order from top to bottom, and each cyclone is a device that separates cement raw materials (preheated raw materials) from high-temperature gas.

[0018] Between cyclone C1 and cyclone C2, a gas duct 14a for flowing high-temperature gas from cyclone C2 towards cyclone C1 is provided, and inside the gas duct 14a, a chute 14b for supplying cement raw materials to the preheating and calcining section 10 is connected. The preheating and calcining section 10 (manufacturing device 1) supplies the cement raw materials generated through previous processes including the grinding process, etc. to the gas duct 14a via the chute 14b. The cement raw materials supplied into the gas duct 14a are dispersed in the high-temperature gas rising from cyclone C2, and while being preheated by heat exchange with the high-temperature gas, they are introduced into cyclone C1. In cyclone C1, the cement raw materials and the high-temperature gas are separated.

[0019] Between cyclone C2 and cyclone C3, a gas duct 16a for flowing high-temperature gas from cyclone C3 towards cyclone C2 is provided, and inside the gas duct 16a, a chute 16b for introducing the cement raw materials collected in cyclone C1 is connected. The cement raw materials collected in cyclone C1 are introduced into the gas duct 16a via the chute 16b. The cement raw materials introduced into the gas duct 16a are dispersed in the high-temperature gas rising from cyclone C3, and while being preheated by heat exchange with the high-temperature gas, they are introduced into cyclone C2. In cyclone C2, the cement raw materials and the high-temperature gas are separated.

[0020] Between the cyclone C3 and the cyclone C4, a gas duct 18a is provided for flowing high-temperature gas from the cyclone C4 towards the cyclone C3. Inside the gas duct 18a, a chute 18b for introducing the cement raw material collected in the cyclone C2 is connected. The cement raw material collected in the cyclone C2 is introduced into the gas duct 18a through the chute 18b. The cement raw material introduced into the gas duct 18a is dispersed in the high-temperature gas rising from the cyclone C4 and is preheated by heat exchange with the high-temperature gas while being introduced into the cyclone C3. In the cyclone C3, the cement raw material and the high-temperature gas are separated. As described above, the cement raw material is preheated while descending in the order of the cyclones C1, C2, and C3.

[0021] The preheating and calcining section 10 further includes a calcining section 24 and a chute 22. The calcining section 24 calcines the cement raw material introduced therein using high-temperature gas containing exhaust gas introduced from the kiln end 32 of the rotary kiln 30. The calcining section 24 has a calcining furnace 26 and a rising duct 28.

[0022] The calcining furnace 26 is a furnace body for calcining the cement raw material with high-temperature gas containing exhaust gas from the rotary kiln 30. The calcining furnace 26 is connected to the kiln end 32 of the rotary kiln 30 through the rising duct 28. That is, the rising duct 28 connects the calcining furnace 26 and the rotary kiln 30. The rising duct 28 guides the exhaust gas from the rotary kiln 30 to the calcining furnace 26. The exhaust gas from the kiln end 32 of the rotary kiln 30 flows upward in the rising duct 28 and the calcining furnace 26. The calcining furnace 26 has a combustion mechanism (not shown) such as a burner for burning fuel such as coal. Therefore, the high-temperature gas also includes combustion gas from the combustion mechanism such as the burner. A swirling flow that rises while swirling inside the calcining furnace 26 may be formed by the combustion gas from the burner or the like. In the calcining furnace 26 (calcining section 24), decarbonation of limestone (calcium carbonate: CaCO3) contained in the cement raw material is performed by heat exchange between the cement raw material and the high-temperature gas.

[0023] Chute 22 feeds (supplies) the cement raw material collected in cyclone C3 into the rising duct 28 of the calcination section 24. Calcination furnace 26 sends the cement raw material and the high-temperature gas (exhaust gas and combustion gas) for calcining the cement raw material from its top toward cyclone C4. In cyclone C4, the decarboxylated (calcined) cement raw material is separated from the high-temperature gas. After calcination, the cement raw material separated from the high-temperature gas is supplied to the rotary kiln 30 via a chute connecting the lower part of cyclone C4 and the rotary kiln 30. The high-temperature gas separated in cyclone C4 is introduced into cyclone C3 through the gas duct 18a as described above.

[0024] The manufacturing apparatus 1 further includes a chlorine bypass 40. Industrial waste used as fuel for heating cement raw materials contains volatile components such as chlorine. To suppress the concentration of such components as they circulate within the rotary kiln 30 and the preheating and calcination section 10, the chlorine bypass 40 extracts a portion of the exhaust gas from the rotary kiln 30. For example, a probe 42 is connected to the chlorine bypass 40. The probe 42 extracts exhaust gas from the rising duct 28 and introduces the extracted exhaust gas (hereinafter referred to as "extracted gas") into the chlorine bypass 40.

[0025] The chlorine bypass 40 includes, for example, a cooling unit 44, a chamber 46, a heat exchanger 48, a dust collector 52, and a suction fan 54. The cooling unit 44, chamber 46, heat exchanger 48, dust collector 52, and suction fan 54 are arranged in this order from the probe 42 along the flow of the extracted gas. The cooling unit 44 and heat exchanger 48 cool the extracted gas to below the melting point of the volatile alkali salt. In the chamber 46, the extracted gas from the probe 42 and cooling unit 44 is further mixed and homogenized. At this time, the extracted gas may be mixed with exhaust gas extracted from other cement clinker manufacturing equipment.

[0026] The dust collector 52 collects chlorine bypass dust contained in the extracted gas and precipitated during cooling. The suction fan 54 draws exhaust gas from the rising duct 28. The exhaust gas discharged from the suction fan 54 may be introduced into the clinker cooler 60, for example, as a cooling gas for cooling the cement clinker. The provision of the chlorine bypass 40 reduces volatile components within the manufacturing apparatus 1.

[0027] The rotary kiln 30 fires the cement raw materials supplied from the cyclone C4 to the kiln end 32 via a chute. The rotary kiln 30 has a main body 34 and a burner 36 provided at the rear end of the main body 34. In the rotary kiln 30, the cement raw materials that have been preheated and calcined in the preheating and calcination section 10 are heated by combustion by the burner 36 to produce cement clinker. The rotary kiln 30 supplies the produced cement clinker to the clinker cooler 60. The clinker cooler 60 cools the cement clinker using a cooling gas.

[0028] (dispersion device) Next, using Figures 2 and 3, the details of the section in which cement raw materials are introduced from the chute 22 into the rising duct 28 of the preheating section 24 will be explained. The end of the chute 22 is connected to the side wall 28a of the rising duct 28 of the preheating section 24. The chute 22 functions as a raw material input section for introducing cement raw materials into the rising duct 28. The preheating preheating section 10 further includes a dispersion device 70 for dispersing the cement raw materials introduced into the rising duct 28.

[0029] The dispersion device 70 is located inside the rising duct 28. For example, the dispersion device 70 is attached to the cylindrical side wall 28a of the rising duct 28, or to the end of the chute 22 closest to the rising duct 28. The dispersion device 70 (the raw material inlet from the chute 22) is located approximately in the center of the rising duct 28 in the vertical direction. The dispersion device 70 may also be located in the upper or lower half of the rising duct 28 in the vertical direction. The dispersion device 70 may be attached to the side wall 28a or the end of the chute 22 via fixing members. The dispersion device 70 is located at (or near) the inlet for the cement raw material from the chute 22 to the rising duct 28. More specifically, the dispersion device 70 is located in the area through which the cement raw material introduced from the chute 22 can pass (the area indicated by "PA" in the figure).

[0030] The dispersion device 70 has a dispersion member 72. The dispersion member 72 is placed inside the rising duct 28 and has the function of dispersing the cement raw material introduced from the chute 22. The dispersion member 72 is formed to extend in one direction. The dispersion member 72 may be placed substantially horizontally in area PA, or it may be placed at an angle to the horizontal plane. The dispersion member 72 is placed so that its direction of extension is toward the center (inside) of the rising duct 28 from the side wall 28a. Hereinafter, the direction of extension of the dispersion member 72 when it is placed horizontally will be referred to as "direction D1". That is, direction D1 corresponds to a horizontal direction.

[0031] The angle between the direction PD of cement raw material input via the chute 22 and the direction of extension of the dispersion member 72 is set to a predetermined angle, taking into consideration the prevention of cement raw material sliding down and accumulating. The direction PD of cement raw material input corresponds to the direction in which the side wall of the chute 22 (more specifically, the side wall of the end of the chute 22 connected to the rising duct 28) extends. The angle between the input direction PD and the direction of extension of the dispersion member 72 may be, for example, 90° to 150°, 100° to 140°, or 110° to 130°.

[0032] The angle between the dispersion member 72 and the extending direction of the end of the chute 22 near the side wall 28a may be 150° or less, 140° or less, or 130° or less, from the viewpoint of preventing cement raw materials from sliding down. The angle between the dispersion member 72 and the extending direction of the end of the chute 22 near the side wall 28a may be 90° or more, 100° or more, or 110° or more, from the viewpoint of preventing cement raw materials from accumulating.

[0033] In one example, the dispersion member 72 is composed of a plurality of rod-shaped members (hereinafter referred to as "rod-shaped members 82"), as shown in Figures 3(a) and 3(b). Each of the plurality of rod-shaped members 82 is formed to extend in one direction, and for example, one end of each is inserted into a mounting hole 28b provided in the side wall 28a (see also Figure 2). Figure 3(a) illustrates a portion of each rod-shaped member 82 that is exposed to the internal space of the rising duct 28.

[0034] Multiple rod-shaped members 82 are arranged with gaps between them. Multiple rod-shaped members 82 are arranged with gaps between them along a direction intersecting the direction PD in which cement raw materials are introduced by the chute 22. In this case, with respect to the introduction direction PD, multiple rod-shaped members 82 are arranged side by side along a direction intersecting the extending direction of each rod-shaped member 82 (for example, a perpendicular direction). In one example, multiple rod-shaped members 82 are arranged side by side along the horizontal direction. For example, when each rod-shaped member 82 is arranged horizontally, multiple rod-shaped members 82 are arranged along a direction perpendicular to both the vertical direction and direction D1 (hereinafter referred to as "direction D2").

[0035] Each of the multiple rod-shaped members 82 may be formed such that the cross-section intersecting the extending direction of the rod-shaped member 82 is circular. Unlike the examples in Figures 3(a) and 3(b), the cross-section of the rod-shaped member 82 may be elliptical or polygonal. The height positions (e.g., center positions) of the multiple rod-shaped members 82 may be approximately the same as or different from each other. The multiple rod-shaped members 82 may be arranged at equal intervals from each other in direction D2. The distance S between adjacent rod-shaped members 82 may be shorter than or longer than the diameter of the rod-shaped member 82 (length in direction D2), or may be approximately the same as the diameter of the rod-shaped member 82.

[0036] Each of the multiple rod-shaped members 82 (dispersion members 72) may be provided to be movable along its extending direction. More specifically, each rod-shaped member 82 may be movable such that the range of each rod-shaped member 82 exposed to the internal space of the rising duct 28 changes. For example, each rod-shaped member 82 may be movable between a first position in which the entire range that can be exposed to the internal space of the rod-shaped member 82 is exposed and a second position in which the entire range that can be exposed is not exposed. The multiple rod-shaped members 82 may be movable individually or may be movable together. As described above, each rod-shaped member 82 may be provided to be removable from the rising duct 28.

[0037] Each of the multiple rod-shaped members 82 may be rotatably mounted around an axis Ax along its extending direction. The axis Ax substantially coincides with the center of the cross-section (for example, the center of a circle) that intersects the extending direction of the corresponding rod-shaped member 82. If the rod-shaped member 82 is rotatable, it may also be movable along the extending direction, or its position may be fixed in the extending direction. The rod-shaped member 82 may be moved or rotated by operation by a worker or by driving by a motor or the like.

[0038] Of the cement raw materials introduced from the chute 22, those heading towards the rod-shaped members 82 are dispersed upon contact with the (upper surface) of the rod-shaped members 82. In other words, the multiple rod-shaped members 82 function as the main body for dispersing the cement raw materials. Of the exhaust gas (upward flow) from the rotary kiln 30 through the rising duct 28 toward the calcination furnace 26, a portion that passes through the area where the dispersion device 70 is installed passes between adjacent rod-shaped members 82 and moves upward. In other words, the space located between adjacent rod-shaped members 82 functions as a gas flow section through which the exhaust gas passes.

[0039] The components constituting the dispersion member 72 are not limited to multiple rod-shaped members 82. In the example shown in Figure 4(a), the dispersion member 72 is composed of a plate-shaped member (hereinafter referred to as "plate-shaped member 73") with multiple notches formed therein. In this case, the dispersion member 72 is composed of a comb-shaped plate-shaped member 73. The dispersion member 72 shown in Figure 4(a) is composed of a plate-shaped member 73 with two notches 74 formed therein. The plate-shaped member 73 functions as the main body that disperses the cement raw material introduced into the rising duct 28. The two notches 74 function as gas flow sections that allow exhaust gas from the rotary kiln 30 rising inside the rising duct 28 to pass through.

[0040] The plate-shaped member 73 is the main body of the dispersion member 72. The plate-shaped member 73 (dispersion member 72) is positioned intersecting the direction PD of cement material input from the chute 22. In this case, the upper surface of the plate-shaped member 73 extends along the direction intersecting the input direction PD. When the cement material hits the upper surface of the plate-shaped member 73, its passage downward is prevented, and the cement material is dispersed. Two notches 74 are formed on the peripheral edge of the plate-shaped member 73. The periphery forming the notches 74 is formed to be recessed inward in the peripheral region of the dispersion member 72 (plate-shaped member 73). More specifically, assuming there are no multiple notches 74, a part of the periphery of the dispersion member 72 is formed to be recessed inward relative to the hypothetical rectangular periphery of the dispersion member 72, and the recessed portion forms each notch 74.

[0041] The notches 74 may be formed at the tip of the dispersion member 72 (plate-shaped member 73) near the center of the rising duct 28. The two notches 74 extend along direction D1 to separate the tip into three parts. The notches 74 are slits with one end open to the outside. The notches 74 are connected to an external region of the plate-shaped member 73 when viewed from a direction perpendicular to the main surface (upper or lower surface) of the plate-shaped member 73.

[0042] The length of the notch 74 along direction D1 may be 1 / 5 to 1 times the length of the portion of the plate-shaped member 73 that can be exposed inside the rising duct 28 along direction D1. The length of the notch 74 in direction D1 may be 1 / 4, 1 / 3, or 1 / 2 or more times the length of the exposed portion in direction D1, from the viewpoint of not excessively obstructing the flow of exhaust gas from the rotary kiln 30. The plate-shaped member 73 (dispersion member 72) may be provided so as to be movable along the extending direction of the plate-shaped member 73 so that the portion exposed inside the rising duct 28 changes.

[0043] The width W of the notch 74 along direction D2 may be approximately constant. That is, even if the position in direction D1 changes, the distance (width W) between the two parts that sandwich the notch 74 may be approximately constant. Unlike the example shown in Figure 4(a), the width W of the notch 74 may decrease from the tip towards the base (side wall 28a) and increase from the tip towards the substrate. In the example shown in Figure 4(a), the periphery forming the notch 74 is a straight line, but at least a part of the periphery forming the notch 74 may be a curve (e.g., a circular arc). The shape or dimensions of at least some of the multiple notches 74 may differ from each other.

[0044] The dispersion device 70 may have two dispersion members 72, as shown in Figure 4(b). The two dispersion members 72 are arranged side by side along a direction D2 that intersects the extending direction of each dispersion member 72. These two dispersion members 72 are formed similarly to each other, except that they are symmetrical. The two dispersion members 72 may be independently movable along direction D1. In the example shown in Figure 4(a), the edge of the tip of the plate-like member 73 is parallel to direction D2, but as shown in Figure 4(b), the edge of the tip may be inclined with respect to direction D2.

[0045] [Method for manufacturing cement clinker] Cement clinker can be manufactured using the manufacturing apparatus 1 described above. The method for manufacturing cement clinker includes, for example, a preheating and calcination step, a firing step, a recovery step, and a cooling step. In the preheating and calcination step, the cement raw material is preheated and calcined by the preheating and calcination section 10. In the firing step, the preheated and calcined cement raw material is supplied from the preheating and calcination section 10 to the kiln end 32 of the rotary kiln 30, and cement clinker is produced by firing in the rotary kiln 30. In the recovery step, exhaust gas containing volatile components is extracted from the rising duct 28 of the calcination section 24 into the chlorine bypass 40, and chlorine bypass dust is recovered. In the cooling step, the cement clinker produced in the firing step is cooled by the clinker cooler 60.

[0046] More specifically, in the preheating and calcination process, the cement raw materials generated in the preceding processes, including the crushing process, are supplied from chute 14b to gas duct 14a between cyclone C1 and cyclone C2. The cement raw materials supplied to gas duct 14a then flow through cyclone C1, cyclone C2, and cyclone C3, and are preheated by high-temperature gas containing exhaust gas from rotary kiln 30. Subsequently, the preheated cement raw materials are fed into the rising duct 28 from chute 22, which connects cyclone C3 to the rising duct 28.

[0047] When cement raw materials are introduced from the chute 22, a portion of the introduced cement raw materials is dispersed by a dispersion member 72 (for example, multiple rod-shaped members 82) provided near the cement raw material inlet. The cement raw materials dispersed by the dispersion member 72, as well as the cement raw materials that pass through the dispersion member 72 without hitting it, are dispersed into the high-temperature gas flowing upward within the rising duct 28. As a result, decarboxylation (calcination of the cement raw materials) occurs in the rising duct 28 and the calcination furnace 26.

[0048] The cement raw materials, which have been calcined in the calcination furnace 26, are introduced into the cyclone C4 from the top of the calcination furnace 26. From the cyclone C4, the calcined cement raw materials are supplied to the kiln end 32 of the rotary kiln 30. Subsequently, as the main body 34 of the rotary kiln 30 rotates, the cement raw materials are agitated and calcined by the combustion gas from the burner 36. As a result, cement clinker is produced.

[0049] Although several embodiments of the present disclosure have been described above, the present disclosure is not limited in any way to the embodiments described above. Furthermore, the descriptions of the embodiments described above can be applied to each other. For example, a plurality of rod-shaped members 82 and a plate-shaped member 73 having a plurality of notches 74 formed thereon may be arranged in the rising duct 28. In the above example, the plurality of notches 74 are provided on one side of the tip of the dispersion member 72 (the side closest to the center of the rising duct 28), but they may be formed on different sides connected to that side and extending along direction D1. The number of plurality of rod-shaped members 82 and the number of plurality of notches 74 can be any number as long as there are two or more.

[0050] [Effects of the Embodiment] In the manufacturing apparatus 1 according to one embodiment described above, the cement raw material introduced from the raw material input section (chute 22) is dispersed by a plurality of rod-shaped members 82 arranged at intervals. As a method of dispersion, it is also conceivable to install a single plate-shaped member without notches or the like inside the rising duct 28, but in this case, the dispersion member has a significant impact on the exhaust gas flowing inside the rising duct 28. Another method is to provide a space for arranging the dispersion member on the side of the rising duct 28 (a space bulging below the chute 22). However, in this case, there are concerns about turbulence in the gas flow, a decrease in gas temperature, and the formation of a coating in the space caused by providing such a space.

[0051] In contrast, in the above-mentioned manufacturing apparatus 1, since spaces are provided between the multiple rod-shaped members 82, the degree to which the flow of exhaust gas in the rising duct 28 is obstructed by the dispersion member 72 is reduced. Therefore, it becomes possible to disperse the cement raw materials while suppressing the impact on the gas flowing in the rising duct 28.

[0052] Each of the multiple rod-shaped members 82 may be rotatably mounted around an axis Ax along the extending direction of the rod-shaped member 82. In this case, rotating the rod-shaped member 82 makes it difficult for exhaust gas to form a coating on the rod-shaped member 82, and makes it difficult for cement raw materials to accumulate on the rod-shaped member 82. As a result, it becomes possible to suppress the impact on gas caused by accumulated material on the rod-shaped member 82.

[0053] In the manufacturing apparatus 1 according to another embodiment described above, cement raw materials introduced from the raw material input section (chute 22) are dispersed by a plate-shaped member 73 having multiple notches 74 formed thereon. Since spaces are formed by the multiple notches 74, the degree to which the flow of exhaust gas in the rising duct 28 is obstructed by the dispersion member 72 is reduced. For example, if a plate-shaped member with one notch is placed in the rising duct 28, it is conceivable to enlarge that one notch in order to suppress obstruction of the gas flow. In this case, the dispersion function of the dispersion member may be impaired. In contrast, by forming multiple notches, the degree to which the gas flow is obstructed can be reduced without impairing the dispersion function. Therefore, it is possible to disperse the cement raw materials while suppressing the impact on the gas flowing in the rising duct 28.

[0054] The dispersion member 72 is formed to extend in one direction and may be provided so as to be movable along the direction of extension of the dispersion member 72. In this case, the amount of cement raw material dispersed can be adjusted by changing the position of the dispersion member 72. As a result, the amount of dispersion can be adjusted according to the operating conditions of the manufacturing apparatus 1. [Explanation of symbols]

[0055] 1...Cement clinker manufacturing apparatus, 10...Preheating and calcination section, C1, C2, C3, C4...Cyclone, 22...Cute, 24...Cacination section, 26...Cacination furnace, 28...Rising duct, 30...Rotary kiln, 40...Chlorine bypass, 60...Clinker cooler, 70...Dispersion device, 72...Dispersion member, 73...Plate-shaped member, 74...Notch, 82...Rod-shaped member.

Claims

1. A calcination furnace that calcines cement raw materials using gas containing exhaust gas from a rotary kiln, A rising duct connects the aforementioned calcination furnace and the rotary kiln, and guides the exhaust gas to the calcination furnace. The rising duct includes a raw material input section for introducing cement raw materials, A dispersion member is placed inside the rising duct to disperse the cement raw materials introduced from the raw material input section, A separate dispersion member is placed inside the rising duct to disperse the cement raw materials introduced from the raw material input section, Equipped with, The aforementioned dispersion member is composed of a plate-shaped member having a plurality of notches formed therein. The aforementioned dispersion member is formed to extend in one direction and is provided to be movable along the direction of extension of the dispersion member. A cement clinker manufacturing apparatus in which the aforementioned dispersion member and the aforementioned other dispersion member are provided to be movable independently.

2. A calcination furnace that calcines cement raw materials with gas containing exhaust gas from the rotary kiln is connected to the rotary kiln, and a dispersion member that disperses the cement raw materials introduced into a rising duct that guides the exhaust gas to the calcination furnace, The system comprises another dispersion member for dispersing the cement raw materials introduced into the rising duct, The aforementioned dispersion member is composed of a plate-shaped member having a plurality of notches formed therein. The aforementioned dispersion member is formed to extend in one direction and is provided to be movable along the direction of extension of the dispersion member. A dispersion device in which the aforementioned dispersion member and the other dispersion member are provided to be movable independently.

Images