Cement clinker manufacturing equipment and dispersion equipment

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 a cement clinker manufacturing apparatus and a dispersion apparatus. [Background technology]

[0002] In a manufacturing device for producing cement clinker, for example, a new suspension preheater (NSP) is used to preheat raw material powder, which is a raw material for cement. In this NSP, raw material powder may be fed from a cyclone into a rising duct connected to a calciner. In this case, if the raw material powder is not dispersed in the high-temperature gas in the rising duct, it will fall to the bottom without heat exchange. As a result, there is a risk of trouble such as the operation of the chlorine bypass being hindered due to the inflow of raw material powder into the extraction port of the chlorine bypass. For this reason, a dispersing device (for example, see Patent Document 1) that disperses raw material powder (granular material) is used, and efforts are made to disperse the raw material powder in the high-temperature gas. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2015 / 159572 Summary of the Invention [Problem to be solved by the invention]

[0004] The present disclosure provides a cement clinker production apparatus and a dispersion device capable of dispersing cement raw materials while suppressing the effect on gas flowing inside a rising duct. [Means for solving the problem]

[0005] A cement clinker manufacturing apparatus according to one aspect of the present disclosure includes a calciner for calcining cement raw materials with gas including exhaust gas from a rotary kiln, a rising duct for connecting the calciner and the rotary kiln and directing the exhaust gas to the calciner, a raw material input section for inputting the cement raw materials into the rising duct, and a dispersing member disposed inside the rising duct for dispersing the cement raw materials input from the raw material input section. The dispersing member is composed of a plurality of rod-shaped members arranged at intervals.

[0006] In this manufacturing equipment, the cement raw materials fed from the raw material feed section are dispersed by a number of rod-shaped members arranged at intervals. Spaces are provided between the rod-shaped members, so the degree to which the flow of exhaust gas in the rising duct is hindered by the dispersion members is reduced. This makes it possible to disperse the cement raw materials while minimizing the impact on the gas flowing in the rising duct.

[0007] Each of the rod-shaped members may be rotatable about an axis along the extension direction of the rod-shaped member. In this case, by rotating the rod-shaped members, the exhaust gas is less likely to coat the rod-shaped members, and the cement raw material is less likely to remain on the rod-shaped members. As a result, it is possible to suppress the effect of the matter remaining on the rod-shaped members on the gas.

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

[0009] In this manufacturing equipment, the cement raw materials fed from the raw material feed section are dispersed by a plate-shaped member having a number of cutouts. Since the cutouts form spaces, the degree to which the flow of exhaust gas in the rising duct is hindered by the dispersion member is reduced. This makes it possible to disperse the cement raw materials while minimizing the impact on the gas flowing in the rising duct.

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

[0011] A dispersion device according to one aspect of the present disclosure is a device that connects a calciner, which calcines the cement raw materials with gas including exhaust gas from the rotary kiln, to the rotary kiln, and disperses the cement raw materials fed into a rising duct that guides the exhaust gas to the calciner. The dispersion device includes a plurality of rod-shaped members arranged at intervals. As with the cement clinker manufacturing device described above, the dispersion device makes it possible to disperse the cement raw materials while suppressing the effect on the gas flowing in the rising duct.

[0012] A dispersion device according to one aspect of the present disclosure is a device that connects a calciner, which calcines the cement raw materials with gas including exhaust gas from the rotary kiln, to the rotary kiln, and disperses the cement raw materials fed into a rising duct that guides the exhaust gas to the calciner. The dispersion device includes a plate-shaped member having a plurality of notches. As with the cement clinker manufacturing device described above, the dispersion device makes it possible to disperse the cement raw materials while suppressing the effect on the gas flowing in the rising duct. Effect of the Invention

[0013] According to the present disclosure, there is provided a cement clinker manufacturing apparatus and a dispersion device capable of dispersing cement raw materials while suppressing the effect on the gas flowing inside the rising duct. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a schematic diagram showing an example of a cement clinker production apparatus. [Diagram 2] FIG. 2 is a side view illustrating an example of a dispersion device and its periphery. [Diagram 3] Fig. 3(a) is a perspective view that shows a schematic example of a dispersion member, and Fig. 3(b) is a side view that shows a schematic example of a dispersion member. [Figure 4] 4(a) and 4(b) are top views that diagrammatically show an example of the dispersion member. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, the embodiments will be described with reference to the drawings. In the description, the same elements or elements having the same functions are given the same reference numerals, and duplicated descriptions will be omitted. In addition, unless otherwise specified, the positional relationships such as up, down, left, and right are based on the positional relationships shown in the drawings. Furthermore, the dimensional ratios of each element are not limited to the ratios shown in the drawings.

[0016] [Cement clinker manufacturing equipment] FIG. 1 shows a schematic diagram of a cement clinker manufacturing apparatus according to one embodiment. The manufacturing apparatus 1 is an apparatus that manufactures cement clinker by firing a cement raw material. A cement raw material in the form of granular material (powder) is supplied to the manufacturing apparatus 1. The manufacturing apparatus 1 includes, for example, a preheating and calcining 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 the 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 exhaust gas generated in the rotary kiln 30. The high-temperature gas has a temperature sufficient to preheat and calcinate the cement raw materials. The preheating and calcining section 10 has four cyclones C1, C2, C3, and C4, gas ducts 14a, 16a, and 18a, and chutes 14b, 16b, and 18b. The four cyclones C1, C2, C3, and C4 are arranged in this order from the top, and each cyclone is a device that separates the cement raw materials (preheated raw materials) from the high-temperature gas.

[0018] Between the cyclones C1 and C2, a gas duct 14a is provided for flowing high-temperature gas from the cyclone C2 toward the cyclone C1, and a chute 14b for supplying the cement raw material to the preheating calcination section 10 is connected to the inside of the gas duct 14a. The preheating calcination section 10 (manufacturing apparatus 1) supplies the cement raw material produced through a previous process including a crushing process to the gas duct 14a via the chute 14b. The cement raw material supplied into the gas duct 14a is dispersed in the high-temperature gas rising from the cyclone C2, and is introduced into the cyclone C1 while being preheated by heat exchange with the high-temperature gas. In the cyclone C1, the cement raw material and the high-temperature gas are separated.

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

[0020] Between the cyclones C3 and C4, a gas duct 18a is provided for flowing high-temperature gas from the cyclone C4 toward the cyclone C3, and a chute 18b is connected to the inside of the gas duct 18a for feeding the cement raw materials collected in the cyclone C2. The cement raw materials collected in the cyclone C2 are fed into the gas duct 18a through the chute 18b. The cement raw materials fed into the gas duct 18a are dispersed in the high-temperature gas rising from the cyclone C4, and are introduced into the cyclone C3 while being preheated by heat exchange with the high-temperature gas. In the cyclone C3, the cement raw materials are separated from the high-temperature gas. As described above, the cement raw materials are 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 materials fed therein using high-temperature gas, including exhaust gas, introduced from the bottom 32 of the rotary kiln 30. The calcining section 24 includes a calciner 26 and a rising duct 28.

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

[0023] The chute 22 feeds (supplies) the cement raw material collected in the cyclone C3 into the rising duct 28 of the calcination section 24. The calciner 26 sends out the cement raw material and high-temperature gas (the above-mentioned exhaust gas and combustion gas) for calcining the cement raw material from its upper portion toward the cyclone C4. In the cyclone C4, the decarbonated (calcined) cement raw material and the high-temperature gas are separated. The cement raw material separated from the high-temperature gas after calcination is supplied to the rotary kiln 30 through a chute connecting the lower portion of the cyclone C4 and the rotary kiln 30. The high-temperature gas separated in the cyclone C4 is introduced into the 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 the cement raw materials contains volatile components such as chlorine. In order to prevent such components from concentrating while circulating in the rotary kiln 30 and the preheating calcination section 10, the chlorine bypass 40 extracts a part 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 the exhaust gas in 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 section 44, a chamber 46, a heat exchanger 48, a dust collector 52, and a suction fan 54. The cooling section 44, the chamber 46, the heat exchanger 48, the dust collector 52, and the suction fan 54 are arranged in this order from the probe 42 along the flow of the bleed gas. The cooling section 44 and the heat exchanger 48 cool the bleed gas to a temperature equal to or lower than the melting point of the volatile alkali salt. In the chamber 46, the bleed gas that has passed through the probe 42 and the cooling section 44 is further mixed and homogenized. At this time, the bleed gas may be mixed with exhaust gas bled from another cement clinker manufacturing device.

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

[0027] The rotary kiln 30 burns the cement raw materials supplied from the cyclone C4 to the kiln base 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 preheated and calcined in the preheating and calcining section 10 are heated by combustion using the burner 36 to produce cement clinker. The rotary kiln 30 supplies the produced cement clinker to a clinker cooler 60. The clinker cooler 60 cools the cement clinker using cooling gas.

[0028] (dispersion device) 2 and 3, the section where the cement raw materials are charged from the chute 22 to the rising duct 28 of the calcination section 24 will be described in detail. An end of the chute 22 is connected to a side wall 28a of the rising duct 28 of the calcination section 24. The chute 22 functions as a raw material charging section that charges the cement raw materials into the rising duct 28. The preheating calcination section 10 further has a dispersing device 70 that disperses the cement raw materials charged into the rising duct 28.

[0029] The dispersion device 70 is disposed 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 the end of the chute 22 close to the rising duct 28. The dispersion device 70 (the raw material inlet of the chute 22) is disposed, for example, in the approximate center of the rising duct 28 in the vertical direction. The dispersion device 70 may be disposed in the upper half 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 a fixing member. The dispersion device 70 is disposed at (or in the vicinity of) the inlet of the cement raw material from the chute 22 to the rising duct 28. More specifically, the dispersion device 70 is disposed in an area (area indicated by "PA" in the drawing) through which the cement raw material charged from the chute 22 can pass.

[0030] The dispersion device 70 has a dispersion member 72. The dispersion member 72 is disposed in the rising duct 28 and has a function of dispersing the cement raw material charged from the chute 22. The dispersion member 72 is formed to extend along one direction. The dispersion member 72 may be disposed substantially horizontally in the area PA, or may be disposed inclined with respect to the horizontal plane. The dispersion member 72 is disposed so that its extension direction is from the side wall 28a toward the center (inside) of the rising duct 28. Hereinafter, the extension direction of the dispersion member 72 when the dispersion member 72 is disposed horizontally is referred to as "direction D1". In other words, direction D1 corresponds to one horizontal direction.

[0031] The angle between the charging direction PD of the cement raw material by the chute 22 and the extension direction of the dispersion member 72 is set to a predetermined angle in consideration of preventing the cement raw material from slipping down and staying. The charging direction PD of the cement raw material corresponds to the extension direction of 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). The angle between the charging direction PD and the extension direction 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 extension direction of the end portion of the chute 22 close to the side wall 28a may be 150° or less, 140° or less, or 130° or less from the viewpoint of preventing the cement raw material from slipping down. The angle between the dispersion member 72 and the extension direction of the end portion of the chute 22 close to the side wall 28a may be 90° or more, 100° or more, or 110° or more from the viewpoint of preventing the cement raw material from stagnation.

[0033] In one example, the dispersion member 72 is configured by 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 the rod-shaped members 82 is inserted into a mounting hole 28b provided in the side wall 28a (see also Figure 2). Figure 3(a) illustrates a part of each rod-shaped member 82 that is exposed to the internal space of the rising duct 28.

[0034] The multiple rod-shaped members 82 are arranged at intervals. The multiple rod-shaped members 82 are arranged at intervals from one another along a direction intersecting the charging direction PD of the cement raw material by the chute 22. In this case, the multiple rod-shaped members 82 are arranged side by side along a direction intersecting (e.g., a direction perpendicular to) the extension direction of each rod-shaped member 82 as viewed from the charging direction PD. In one example, the 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, the multiple rod-shaped members 82 are arranged side by side along a direction perpendicular to both the up-down direction and the direction D1 (hereinafter referred to as "direction D2").

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

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

[0037] Each of the multiple rod-shaped members 82 may be provided rotatably about an axis Ax along the extension direction. The axis Ax approximately coincides with the center of a cross section (e.g., the center of a circle) of the corresponding rod-shaped member 82 that intersects with the extension direction. When the rod-shaped member 82 is rotatable, the rod-shaped member 82 may be movable along the extension direction, or the position of the rod-shaped member 82 may be fixed in the extension direction. The rod-shaped member 82 may be moved or rotated by an operator's operation or by driving a motor or the like.

[0038] Of the cement raw materials fed from the chute 22, those heading toward the rod-shaped members 82 hit the rod-shaped members 82 (upper surfaces) and are dispersed. That is, the multiple rod-shaped members 82 function as a main body that disperses the cement raw materials. Of the exhaust gas (upward flow) traveling from the rotary kiln 30 through the rising duct 28 toward the calciner 26, a portion that passes through the area in which the dispersing device 70 is provided passes between adjacent rod-shaped members 82 and heads upward. That is, the space located between adjacent rod-shaped members 82 functions as a gas circulation section that allows the exhaust gas to pass through.

[0039] The members constituting the dispersion member 72 are not limited to the plurality of rod-shaped members 82. In the example shown in FIG. 4(a), the dispersion member 72 is constituted by a plate-shaped member (hereinafter referred to as "plate-shaped member 73") in which a plurality of cutouts are formed. In this case, the dispersion member 72 is constituted by a comb-tooth-shaped plate-shaped member 73. The dispersion member 72 shown in FIG. 4(a) is constituted by a plate-shaped member 73 in which two cutouts 74 are formed. The plate-shaped member 73 functions as a main body portion that disperses the cement raw material charged into the rising duct 28. The two cutouts 74 function as a gas circulation portion that passes the exhaust gas from the rotary kiln 30 rising in the rising duct 28.

[0040] The plate-shaped member 73 is a main body of the dispersion member 72. The plate-shaped member 73 (dispersion member 72) is disposed so as to intersect with the charging direction PD of the cement raw materials from the chute 22. In this case, the upper surface of the plate-shaped member 73 extends along a direction intersecting with the charging direction PD. When the cement raw materials hit the upper surface of the plate-shaped member 73, the cement raw materials are prevented from passing downward, and the cement raw materials are dispersed. Two notches 74 are formed in the peripheral portion of the plate-shaped member 73. The peripheral edge forming the notches 74 is formed so as to be recessed inward in the peripheral region of the dispersion member 72 (plate-shaped member 73). More specifically, a part of the peripheral edge of the dispersion member 72 is formed so as to be recessed inward with respect to the virtual rectangular peripheral edge of the dispersion member 72 when it is assumed that the multiple notches 74 are not present, and the recessed part forms each notch 74.

[0041] The notch 74 may be formed in a tip portion of the dispersion member 72 (plate-shaped member 73) close to the center of the rising duct 28. The two notch portions 74 extend along the direction D1 so as to separate the tip portion into three portions. The notch portion 74 is a slit with one end open to the outside. When viewed from a direction perpendicular to the main surface (upper surface or lower surface) of the plate-shaped member 73, the notch portion 74 is connected to an area outside the plate-shaped member 73.

[0042] The length of the cutout 74 in the direction D1 may be 1 / 5 to 1 time the length of the portion of the plate-shaped member 73 that can be exposed inside the rising duct 28 in the direction D1. The length of the cutout 74 in the direction D1 may be 1 / 4, 1 / 3, or 1 / 2 or more times the length of the exposed portion in the direction D1, from the viewpoint of not excessively impeding the flow of exhaust gas from the rotary kiln 30. The plate-shaped member 73 (dispersion member 72) may be provided to be movable along the extension 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 the direction D2 may be approximately constant. That is, even if the position in the direction D1 changes, the distance (width W) between the two portions sandwiching the notch 74 may be approximately constant. Unlike the example shown in FIG. 4(a), the width W of the notch 74 may become smaller from the tip portion toward the base portion (side wall 28a) or may become larger from the tip portion toward the substrate portion. The periphery forming the notch 74 is a straight line in the example shown in FIG. 4(a), but at least a part of the periphery forming the notch 74 may be a curved line (e.g., a circular arc). The shapes 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 FIG. 4(b). The two dispersion members 72 are arranged side by side along a direction D2 intersecting the extension direction of each dispersion member 72. These two dispersion members 72 are formed similarly to each other, except that they are line-symmetric. The two dispersion members 72 may be independently movable along the direction D1. In the example shown in FIG. 4(a), the edge of the tip of the plate-like member 73 is parallel to the direction D2, but as shown in FIG. 4(b), the edge of the tip may be inclined with respect to the direction D2.

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

[0046] More specifically, in the preheating and calcining process, the cement raw material generated in the previous process including the pulverization process is supplied from the chute 14b to the gas duct 14a between the cyclones C1 and C2. The cement raw material supplied to the gas duct 14a flows through the cyclones C1, C2, and C3, and is preheated by high-temperature gas including the exhaust gas from the rotary kiln 30. Then, the preheated cement raw material is charged from the chute 22 connecting the cyclone C3 and the rising duct 28 toward the inside of the rising duct 28.

[0047] When the cement raw materials are charged from the chute 22, some of the charged cement raw materials are dispersed by a dispersion member 72 (e.g., a plurality of rod-shaped members 82) provided near the inlet for the cement raw materials. The cement raw materials dispersed by the dispersion member 72 and the cement raw materials that pass through the dispersion member 72 without hitting the dispersion member 72 are dispersed in the high-temperature gas flowing upward in the rising duct 28. As a result, the cement raw materials are decarbonated (calcined) in the rising duct 28 and the calciner 26.

[0048] The cement raw materials calcined in the calciner 26 are introduced into the cyclone C4 from the top of the calciner 26. The calcined cement raw materials are then supplied from the cyclone C4 to the kiln end 32 of the rotary kiln 30. Thereafter, the cement raw materials are burned by the combustion gas from the burner 36 while being stirred by the rotation of the main body 34 of the rotary kiln 30. 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 to the above-mentioned embodiments. The contents of the description of the above-mentioned embodiments can be mutually applied. For example, a plurality of rod-shaped members 82 and a plate-shaped member 73 having a plurality of notches 74 formed therein may be disposed in the rising duct 28. In the above-mentioned example, the plurality of notches 74 are provided on one side (the side closest to the center of the rising duct 28) of the tip of the dispersion member 72, but may be formed on a different side connected to the side and extending along the direction D1. The number of the plurality of rod-shaped members 82 and the number of the plurality of notches 74 may be any number as long as they are two or more.

[0050] [Effects of the embodiment] In the manufacturing apparatus 1 according to the embodiment described above, the cement raw material charged from the raw material charging section (chute 22) is dispersed by a plurality of rod-shaped members 82 arranged at intervals. As a method of dispersion, it is possible to install a single plate-shaped member without notches or the like in the rising duct 28, but in this case, the influence of the dispersion member on the exhaust gas flowing in the rising duct 28 is large. As another method, it is also possible to provide a space (a space bulging below the chute 22) for placing the dispersion member on the side of the rising duct 28. However, in this case, there are concerns that the provision of the space may cause turbulence in the gas flow, reduce the gas temperature, and form a coating in the space.

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

[0052] Each of the multiple rod-shaped members 82 may be provided rotatably about an axis Ax along the extension direction of the rod-shaped members 82. In this case, by rotating the rod-shaped members 82, a coating of exhaust gas is less likely to be formed on the rod-shaped members 82, and the cement raw materials are less likely to remain on the rod-shaped members 82. As a result, it is possible to suppress the effect of the retained matter on the rod-shaped members 82 on the gas.

[0053] In the manufacturing apparatus 1 according to the other embodiment described above, the plate-like member 73 having a plurality of cutouts 74 formed therein disperses the cement raw materials introduced from the raw material introduction section (chute 22). Since the plurality of cutouts 74 form a space, the degree to which the flow of exhaust gas in the rising duct 28 is hindered by the dispersion member 72 is reduced. For example, it is conceivable to arrange a plate-like member having one cutout formed therein in the rising duct 28 and to enlarge the one cutout in order to suppress the obstruction of the gas flow. In this case, the dispersion function of the dispersion member may be impaired. In contrast, if a plurality of cutouts are formed, the degree to which the gas flow is hindered can be reduced without impairing the dispersion function. Therefore, it is possible to disperse the cement raw materials while suppressing the influence 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 extension direction of the dispersion member 72. In this case, the amount of the cement raw material to be dispersed can be adjusted by changing the position of the dispersion member 72. As a result, it is possible to adjust the dispersion amount according to the operating condition of the manufacturing apparatus 1. [Explanation of symbols]

[0055] DESCRIPTION OF THE REFERENCE NUMERALS 1...cement clinker manufacturing apparatus, 10...preheating calcination section, C1, C2, C3, C4...cyclone, 22...chute, 24...calcination section, 26...calcination furnace, 28...rising duct, 30...rotary kiln, 40...chlorine bypass, 60...clinker cooler, 70...dispersion device, 72...dispersion member, 73...plate-shaped member, 74...notched portion, 82...rod-shaped member.

Claims

1. a calciner for calcining the cement raw materials using gas including exhaust gas from the rotary kiln; A rising duct that connects the calciner and the rotary kiln and guides the exhaust gas to the calciner; A raw material input section for inputting cement raw materials into the rising duct; a dispersing member disposed inside the rising duct and dispersing the cement raw material charged from the raw material charging portion, The dispersion member is composed of a plurality of rod-shaped members arranged at intervals, Each of the plurality of rod-shaped members is provided to be movable along an extension direction of the rod-shaped member, The apparatus for producing cement clinker, wherein the plurality of rod-shaped members are individually movable.

2. The manufacturing apparatus according to claim 1 , wherein each of the plurality of rod-shaped members is rotatably provided about an axis extending along an extension direction of the rod-shaped member.

3. A dispersing device that connects a calciner that calcines cement raw materials with a gas containing exhaust gas from a rotary kiln to the rotary kiln and disperses cement raw materials introduced into a rising duct that guides the exhaust gas to the calciner, The device includes a plurality of rod-shaped members arranged at intervals; Each of the plurality of rod-shaped members is provided to be movable along an extension direction of the rod-shaped member, A dispersion device, wherein the plurality of rod-shaped members are individually movable.

4. A dispersion device as described in Claim 3, wherein each of the multiple rod-shaped members is rotatably arranged around an axis along the extension direction of the rod-shaped member.

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