Production device of cement clinker and dispersion device

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 fed from a cyclone into a rising duct connected to a calciner. 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 (see, for example, Patent Document 1) for dispersing raw material powder (powder particles) is used, 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] The cement clinker manufacturing apparatus according to one aspect of the present disclosure includes a calcining furnace that calcines cement raw materials with a gas containing exhaust gas from a rotary kiln, a rising duct that connects the calcining furnace and the rotary kiln and guides the exhaust gas to the calcining furnace, a raw material input section that inputs cement raw materials into the rising duct, and a dispersion member that is disposed inside the rising duct and disperses the cement raw materials input 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, the cement raw materials input from the raw material input section are dispersed by a plurality of rod-shaped members arranged at intervals. Since a space is provided between the plurality of rod-shaped members, the degree to which the flow of the exhaust gas in the rising duct is inhibited by the dispersion member is reduced. Therefore, it is possible to disperse the cement raw materials while suppressing the influence on the gas flowing in the rising duct.

[0007] Each of the plurality of rod-shaped members may be rotatably provided about an axis along the extending direction of the rod-shaped member. In this case, by rotating the rod-shaped member, it is difficult to form a coating by the exhaust gas on the rod-shaped member, and it is difficult for the cement raw materials to stay on the rod-shaped member. As a result, it is possible to suppress the influence on the gas caused by the deposits on the rod-shaped member.

[0008] The cement clinker manufacturing apparatus according to one aspect of the present disclosure includes a calcining furnace that calcines cement raw materials with a gas containing exhaust gas from a rotary kiln, a rising duct that connects the calcining furnace and the rotary kiln and guides the exhaust gas to the calcining furnace, a raw material input section that inputs cement raw materials into the rising duct, and a dispersion member that is disposed inside the rising duct and disperses the cement raw materials input from the raw material input section. The dispersion member is composed of a plate-shaped member in which a plurality of cutout portions are formed.

[0009] In this manufacturing apparatus, the cement raw material introduced from the raw material input section is dispersed by a plate-shaped member having a plurality of notches. Since a space is formed by the plurality of notches, the degree to which the flow of exhaust gas in the rising duct is inhibited by the dispersion member is reduced. Therefore, it is possible to disperse the cement raw material while suppressing the influence on the gas flowing in the rising duct.

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

[0011] The dispersion device according to one aspect of the present disclosure is a device that connects a calcining furnace that calcines a cement raw material with a gas containing exhaust gas from a rotary kiln and the rotary kiln, and disperses the cement raw material introduced into a rising duct that guides the exhaust gas to the calcining furnace. This dispersion device includes a plurality of rod-shaped members arranged at intervals. In this dispersion device, as in the above-described manufacturing apparatus for cement clinker, it is possible to disperse the cement raw material while suppressing the influence on the gas flowing in the rising duct.

[0012] The dispersion device according to one aspect of the present disclosure is a device that connects a calcining furnace that calcines a cement raw material with a gas containing exhaust gas from a rotary kiln and the rotary kiln, and disperses the cement raw material introduced into a rising duct that guides the exhaust gas to the calcining furnace. This dispersion device includes a plate-shaped member having a plurality of notches. In this dispersion device, as in the above-described manufacturing apparatus for cement clinker, it is possible to disperse the cement raw material while suppressing the influence on the gas flowing in the rising duct.

Effects of the Invention

[0013] According to the present disclosure, there are provided a manufacturing apparatus for cement clinker and a dispersion device capable of dispersing a cement raw material while suppressing the influence on the gas flowing in the rising duct.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

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

[0016] [Apparatus for Manufacturing Cement Clinker] FIG. 1 schematically shows an apparatus for manufacturing cement clinker according to an embodiment. The manufacturing apparatus 1 is an apparatus for manufacturing cement clinker by firing cement raw materials. Cement raw materials in the form of powder or granules (powder) are supplied to the manufacturing apparatus 1. The manufacturing apparatus 1 includes, for example, a preheating and precalcining 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 includes 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 a grinding process 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 charging the cement raw materials collected in cyclone C1 is connected. The cement raw materials collected in cyclone C1 are charged into the gas duct 16a via the chute 16b. The cement raw materials charged 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 for flowing high-temperature gas from the cyclone C4 toward the cyclone C3 is provided, and inside the gas duct 18a, a chute 18b for charging the cement raw material collected in the cyclone C2 is connected. The cement raw material collected in the cyclone C2 is charged into the gas duct 18a through the chute 18b. The cement raw material charged 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 including the exhaust gas introduced from the kiln end 32 of the rotary kiln 30. The calcining section 24 includes a calcining furnace 26 and a rising duct 28.

[0022] The calcining furnace 26 is a furnace body that calcines the cement raw material with high-temperature gas including the 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 inside the calcining furnace 26. The calcining furnace 26 has a combustion mechanism (not shown) such as a burner that burns fuels 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 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: CaCO 3 ) contained in the cement raw material is performed by heat exchange between the cement raw material and the high-temperature gas.

[0023] The chute 22 feeds (supplies) the cement raw materials collected in the cyclone C3 into the inside of the rising duct 28 of the precalcining section 24. The precalciner 26 sends out the cement raw materials and the high-temperature gas (the above exhaust gas and combustion gas) for precalcining the cement raw materials from its upper part toward the cyclone C4. In the cyclone C4, the decarbonated (precalcined) cement raw materials and the high-temperature gas are separated. The cement raw materials separated from the high-temperature gas after precalcining are supplied to the rotary kiln 30 through a chute connecting the lower part of the cyclone C4 and the rotary kiln 30. The high-temperature gas separated by 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. The industrial waste used as fuel for heating the cement raw materials contains volatile components such as chlorine. In order to suppress the concentration of such components while circulating in the rotary kiln 30 and the preheating and precalcining 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 has, 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 extracted gas. The cooling section 44 and the heat exchanger 48 cool the extracted gas below the melting point of the volatile alkali salt. In the chamber 46, the extracted gas passing through the probe 42 and the cooling section 44 is further mixed and homogenized. At this time, the extracted gas may be mixed with the exhaust gas extracted from other cement clinker manufacturing apparatuses.

[0026] The dust collector 52 recovers chlorine bypass dust contained in the extraction gas and deposited with cooling. The suction fan 54 sucks 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. By providing the chlorine bypass 40, volatile components in the production apparatus 1 can be reduced.

[0027] The rotary kiln 30 bakes the cement raw material supplied from the cyclone C4 to the kiln end 32 via the 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 material preheated and calcined in the preheating and calcining section 10 is heated by combustion by the burner 36, thereby generating cement clinker. The rotary kiln 30 supplies the generated cement clinker to the clinker cooler 60. The clinker cooler 60 cools the cement clinker using a cooling gas.

[0028] (Dispersion device) Subsequently, with reference to FIGS. 2 and 3, the details of the portion where the cement raw material is charged from the chute 22 into the rising duct 28 of the calcining section 24 will be described. The end of the chute 22 is connected to the side wall 28a of the rising duct 28 of the calcining section 24. The chute 22 functions as a raw material charging section for charging the cement raw material into the rising duct 28. The preheating and calcining section 10 further has a dispersion device 70 for dispersing the cement raw material charged into the rising duct 28.

[0029] The dispersing device 70 is disposed inside the rising duct 28. For example, the dispersing device 70 is attached to the cylindrical side wall 28a of the rising duct 28 or the end portion of the chute 22 close to the rising duct 28. The dispersing device 70 (the inlet of the raw material by the chute 22) is disposed, for example, substantially at the center of the rising duct 28 in the vertical direction. Note that the dispersing device 70 may be disposed in the upper half or the lower half of the rising duct 28 in the vertical direction. The dispersing device 70 may be attached to the side wall 28a or the end portion of the chute 22 via a fixing member. The dispersing device 70 is disposed at the inlet (and its vicinity) of the cement raw material from the chute 22 to the rising duct 28. More specifically, the dispersing device 70 is disposed in a region (the region indicated by "PA" in the figure) through which the cement raw material introduced from the chute 22 can pass.

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

[0031] The angle formed by the feeding direction PD of the cement raw material by the chute 22 and the extending direction of the dispersing member 72 is set to a predetermined angle in consideration of preventing the cement raw material from sliding down and staying. The feeding direction PD of the cement raw material corresponds to the direction in which the side wall of the chute 22 (more specifically, the side wall of the end portion of the chute 22 connected to the rising duct 28) extends. The angle formed by the feeding direction PD and the extending direction of the dispersing member 72 may be, for example, 90° to 150°, may be 100° to 140°, or may be 110° to 130°.

[0032] The angle formed between the dispersion member 72 and the extending direction of the end portion close to the side wall 28a of the chute 22 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 formed between the dispersion member 72 and the extending direction of the end portion close to the side wall 28a of the chute 22 may be 90° or more, 100° or more, or 110° or more from the viewpoint of preventing the cement raw material from staying.

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

[0034] The plurality of rod-shaped members 82 are arranged at intervals. The plurality of rod-shaped members 82 are arranged at intervals along a direction intersecting the input direction PD of the cement raw material by the chute 22. In this case, when viewed from the input direction PD, the plurality of rod-shaped members 82 are arranged side by side along a direction (for example, a direction perpendicular thereto) intersecting the extending direction of each rod-shaped member 82. In one example, the plurality of rod-shaped members 82 are arranged side by side along the horizontal direction. For example, when each rod-shaped member 82 is horizontally arranged, the plurality of rod-shaped members 82 are arranged side by side along a direction (hereinafter referred to as "direction D2") perpendicular to both the vertical direction and the direction D1.

[0035] Each of the plurality of rod-shaped members 82 may be formed such that a cross-section intersecting the extending direction of the rod-shaped member 82 is circular. Different from the examples in FIGS. 3(a) and 3(b), the cross-section of the rod-shaped member 82 may be elliptical or polygonal. The height positions (for example, central positions) of the plurality of rod-shaped members 82 may be substantially the same as each other or different from each other. The plurality of rod-shaped members 82 may be arranged at equal intervals in the direction D2. The interval S between adjacent rod-shaped members 82 may be shorter than the diameter (length in the direction D2) of the rod-shaped member 82, may be longer, or may be substantially the same as the diameter of the rod-shaped member 82.

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

[0037] Each of the plurality of rod-shaped members 82 may be provided rotatably about an axis Ax along its extending direction. The axis Ax substantially coincides with the center of a cross-section (for example, the center of a circle) intersecting the extending direction of the corresponding rod-shaped member 82. When the rod-shaped member 82 is rotatable, the rod-shaped member 82 may be movable along its extending direction or the position of the rod-shaped member 82 may be fixed in the extending direction. The movement of the rod-shaped member 82 may be performed by an operation by an operator or driving by a motor or the like, and the rotation of the rod-shaped member 82 may be performed.

[0038] Of the cement raw materials fed from the chute 22, the raw materials heading for the rod-shaped members 82 hit the rod-shaped members 82 (upper surfaces thereof) and are dispersed. That is, the plurality of rod-shaped members 82 function as a main body for dispersing the cement raw materials. A part of the exhaust gas (upward flow) that passes through the rising duct 28 from the rotary kiln 30 and heads for the calciner 26 and passes through the region where 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 flow passage for allowing the exhaust gas to pass through.

[0039] The members constituting the dispersing member 72 are not limited to the plurality of rod-shaped members 82. In the example shown in Fig. 4(a), the dispersing member 72 is constituted by a plate-shaped member (hereinafter referred to as "plate-shaped member 73") in which a plurality of notches are formed. In this case, the dispersing member 72 is constituted by a comb-shaped plate-shaped member 73. The dispersing member 72 shown in Fig. 4(a) is constituted by a plate-shaped member 73 in which two notches 74 are formed. The plate-shaped member 73 functions as a main body for dispersing the cement raw materials fed into the rising duct 28. The two notches 74 function as gas flow passages for allowing the exhaust gas from the rotary kiln 30 rising in the rising duct 28 to pass through.

[0040] The plate-shaped member 73 is the main body portion of the dispersing member 72. The plate-shaped member 73 (dispersing member 72) is arranged to intersect the feeding 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 the feeding direction PD. When the cement raw materials hit the upper surface of the plate-shaped member 73, the passage of the cement raw materials downward is blocked, and the cement raw materials are dispersed. The two notches 74 are formed at the peripheral portion of the plate-shaped member 73. The periphery forming the notches 74 is formed to be recessed inward in the peripheral region of the dispersing member 72 (plate-shaped member 73). More specifically, with respect to the virtual rectangular periphery of the dispersing member 72 assuming that there are no plurality of notches 74, a part of the periphery of the dispersing member 72 is formed to be recessed inward, and the recessed portion forms each notch 74.

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

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

[0043] The width W of the notch 74 along the direction D2 may be substantially 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 substantially constant. Note that, different from the example shown in FIG. 4(a), the width W of the notch 74 may become smaller as it goes from the tip to the base end (side wall 28a), or may become larger as it goes from the tip to 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 curve (for example, an arc). Among at least a part of the plurality of notches 74, the shape or dimensions may be different from each other.

[0044] As shown in FIG. 4(b), the dispersion device 70 may have two dispersion members 72. 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 in the same manner as each other except for the points that are line-symmetric. The two dispersion members 72 may be individually 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 portion may be inclined with respect to the direction D2.

[0045] [Method for manufacturing cement clinker] Using the above-described manufacturing apparatus 1, cement clinker can be manufactured. The method for manufacturing cement clinker includes, for example, a preheating and calcining step, a firing step, a recovery step, and a cooling step. In the preheating and calcining step, the cement raw material is preheated and calcined by the preheating and calcining unit 10. In the firing step, the preheated and calcined cement raw material is supplied from the preheating and calcining unit 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, the exhaust gas containing volatile components is extracted from the rising duct 28 of the calcining unit 24 to 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 calcining step, the cement raw material produced in a previous step including a pulverizing step and the like is supplied from the chute 14b to the gas duct 14a between the cyclone C1 and the cyclone C2. Then, the cement raw material supplied to the gas duct 14a flows through the cyclone C1, the cyclone C2, and the cyclone C3 and is preheated by the high-temperature gas containing the exhaust gas from the rotary kiln 30. Thereafter, the preheated cement raw material is introduced into the rising duct 28 from the chute 22 connecting the cyclone C3 and the rising duct 28.

[0047] When the cement raw material is introduced from the chute 22, a part of the introduced cement raw material is dispersed by a dispersion member 72 (for example, a plurality of rod-shaped members 82) provided near the inlet of the cement raw material. The cement raw material dispersed by the dispersion member 72 and the cement raw material that has passed 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, decarbonation (precalcination of the cement raw material) of the cement raw material is performed in the rising duct 28 and the precalciner 26.

[0048] The cement raw material calcined in the precalciner 26 is introduced from the upper part of the precalciner 26 into the cyclone C4. Then, from the cyclone C4, the calcined cement raw material is supplied to the kiln end 32 of the rotary kiln 30. Thereafter, as the main body 34 of the rotary kiln 30 rotates, the cement raw material is stirred and fired by the combustion gas from the burner 36. As a result, cement clinker is produced.

[0049] As described above, some embodiments of the present disclosure have been described, but the present disclosure is not limited to the above embodiments at all. Also, the description contents of the above-described embodiments can be applied to each other. For example, a plurality of rod-shaped members 82 and a plate-shaped member 73 formed with a plurality of notches 74 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 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 above-described embodiment, the cement raw material introduced from the raw material input section (shoot 22) is dispersed by a plurality of rod-shaped members 82 arranged at intervals. As a method of dispersion, it is conceivable to install a single plate-shaped member without notches or the like in the rising duct 28. In this case, however, the influence on the exhaust gas flowing in the rising duct 28 from the dispersion member is large. As another method, it is also conceivable to provide a space (a space bulging downward from the shoot 22) for arranging the dispersion member on the side of the rising duct 28. However, in this case, there are concerns about the disturbance of the gas flow caused by providing the space, the decrease in the gas temperature, and the formation of coating in the space.

[0051] On the other hand, in the manufacturing apparatus 1, since a space is provided between the plurality of rod-shaped members 82, the degree to which the flow of the exhaust gas in the rising duct 28 is inhibited by the dispersion member 72 is reduced. Therefore, it is possible to disperse the cement raw material while suppressing the influence on the gas flowing in the rising duct 28.

[0052] Each of the plurality of rod-shaped members 82 may be rotatably provided about an axis Ax along the extending direction of the rod-shaped member 82. In this case, by rotating the rod-shaped member 82, it is difficult for a coating due to the exhaust gas to be formed on the rod-shaped member 82, and it is difficult for the cement raw material to stay on the rod-shaped member 82. As a result, it is possible to suppress the influence on the gas caused by the deposits on the rod-shaped member 82.

[0053] In the manufacturing apparatus 1 according to another embodiment described above, the cement raw material introduced from the raw material input section (shoot 22) is dispersed by the plate-shaped member 73 in which a plurality of notches 74 are formed. Since a space is formed by the plurality of notches 74, the degree to which the flow of exhaust gas in the rising duct 28 is inhibited by the dispersion member 72 is reduced. For example, in order to suppress the inhibition of the gas flow, it is conceivable to dispose a plate-shaped member having one notch in the rising duct 28 and enlarge the one notch. In this case, the dispersion function by the dispersion member may be impaired. On the other hand, if a plurality of notches are formed, the degree of inhibiting the gas flow can be reduced without impairing the dispersion function. Therefore, it is possible to disperse the cement raw material while suppressing the influence on the gas flowing in the rising duct 28.

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

Explanation of reference numerals

[0055] 1... Manufacturing apparatus for cement clinker, 10... Preheating and calcining section, C1, C2, C3, C4... Cyclone, 22... Shoot, 24... Calcining section, 26... Calcining 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 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 cement clinker manufacturing apparatus, wherein the dispersion member is a plate-shaped member having a plurality of cutouts formed therein.

2. The manufacturing apparatus according to claim 1 , wherein the dispersion member is formed to extend in one direction and is provided so as to be movable in the extending direction of the dispersion member.

3. The cement sintering machine further includes another dispersing member disposed inside the rising duct and dispersing the cement raw material introduced from the raw material introduction portion, The manufacturing apparatus according to claim 2 , wherein the dispersion member and the another dispersion member are provided so as to be independently movable.

4. a calciner for calcining cement raw materials by gas containing exhaust gas from the rotary kiln and the rotary kiln, and a dispersing member for dispersing the cement raw materials introduced into a rising duct for introducing the exhaust gas into the calciner; A dispersion device, wherein the dispersion member is a plate-shaped member having a plurality of cutouts formed therein.

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