Cement clinker manufacturing equipment and dispersion equipment

Abstract

To improve heat exchange efficiency of cement raw materials and gas.SOLUTION: A production device of cement clinker comprises: a calcination unit calcinating cement raw materials by using gas containing effluent gas from a rotary kiln; a raw material injection unit injecting the cement raw materials into the calcination unit; and a dispersion component arranged in the inside of the calcination unit and dispersing the cement raw materials injected from the injection unit. The dispersion component has a main body unit that the cement raw materials injected from the raw material injection unit hit, and a transit unit to pass the cement raw materials injected from the raw material injection unit to the downside.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 the raw material powder, which is a raw material for cement. In this NSP, when the raw material powder is fed from a cyclone to a calciner, the raw material powder is often fed directly into the calciner. In this case, if the raw material powder is not dispersed in the calciner, most of the raw material powder may flow down to the lower throat and be sucked in by the chlorine bypass extraction port. As a result, there is a risk of trouble such as interfering with the operation of the chlorine bypass. For this reason, a dispersing device (see, for example, Patent Document 1) that disperses the 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 that can improve the heat exchange efficiency between cement raw materials and gas. [Means for solving the problem]

[0005] A cement clinker manufacturing apparatus according to one aspect of the present disclosure includes a calcination section that calcines a cement raw material with a gas including an exhaust gas from a rotary kiln, a raw material input section that inputs the cement raw material into the calcination section, and a dispersion member that is disposed inside the calcination section and disperses the cement raw material input from the raw material input section. The dispersion member has a main body section against which the cement raw material input from the raw material input section hits, and a passage section that allows the cement raw material input from the raw material input section to pass downward.

[0006] If almost all of the cement raw materials fed toward the calcination section are dispersed by the dispersion member, heat exchange between the cement raw materials and the gas may not occur in the region below the dispersion member, resulting in a decrease in heat exchange efficiency. In response to this, the dispersion member of the present manufacturing apparatus is provided with a passage that allows the cement raw materials to pass downward, so that a portion of the cement raw materials fed into the calcination section is introduced below the dispersion member. This reduces the amount of cement raw materials dispersed above the dispersion member, and heat exchange between a portion of the cement raw materials and the gas also occurs in the region below the dispersion member. As a result, it is possible to improve the heat exchange efficiency between the cement raw materials and the gas.

[0007] The dispersion member may be formed to extend in one direction and may be provided so as to be movable along the extension direction of the dispersion member. In this case, the amount of the cement raw material 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.

[0008] The manufacturing apparatus may further include another dispersing member disposed inside the calcination section and dispersing the cement raw materials fed from the raw material feeding section. The dispersing member and the other dispersing member may be provided so as to be independently movable. In this case, since each dispersing member can be independently moved, it is easy to adjust the amount of dispersion of the cement raw materials.

[0009] The main body may be a plate member formed in a plate shape. The passage part may be formed in the plate member. In this case, the plate member having the passage part formed therein may be disposed in an area through which the charged cement raw material passes, so that the device configuration is simplified.

[0010] The passage portion may include a notch formed in the plate member. In this case, one end of the notch is open to the outside of the plate member, making it easy to form the passage portion.

[0011] The passage portion may include a plurality of holes penetrating the plate member. In this case, no thin portion is formed in the peripheral region of the plate member, so that the durability of the plate member can be improved.

[0012] The manufacturing apparatus may further include a discharge unit that discharges a fluid for removing deposits on the dispersion member toward the dispersion member. In this case, the deposits on the dispersion member can be removed by the removing fluid from the discharge unit, and the effect of the deposits on the dispersion member on the operation of the manufacturing apparatus can be suppressed.

[0013] A dispersion device according to one aspect of the present disclosure is disposed inside a calcination section that calcines the cement raw materials with gas including exhaust gas from a rotary kiln, and includes a dispersion member that disperses the cement raw materials fed into the calcination section. The dispersion member has a main body section against which the fed cement raw materials come into contact, and a passage section through which the fed cement raw materials pass downward. As with the manufacturing apparatus described above, this dispersion device makes it possible to improve the efficiency of heat exchange between the cement raw materials and the gas. Effect of the Invention

[0014] According to the present disclosure, there is provided a cement clinker production apparatus and a dispersion device capable of improving the heat exchange efficiency between the cement raw material and the gas. [Brief description of the drawings]

[0015] [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 top view showing an example of a dispersion member, and Fig. 3(b) is a schematic view showing a cross section taken along line III-III. [Figure 4] 4(a) and 4(b) are top views that diagrammatically show an example of the dispersion member. [Diagram 5] Fig. 5(a) is a top view showing an example of a dispersion member, and Fig. 5(b) is a schematic view showing a cross section taken along line VV. [Figure 6] FIG. 6 is a top view illustrating a schematic example of a dispersion member. [Figure 7] Fig. 7(a) is a perspective view that shows a schematic example of a dispersion member, and Fig. 7(b) is a side view that shows a schematic example of a dispersion member. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] 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.

[0017] [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.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] The preheating calcination section 10 further includes a chute 22 and a calcination section 24. The chute 22 charges (supplies) the cement raw materials collected in the cyclone C3 into the calcination section 24. The calcination section 24 calcines the cement raw materials charged therein using high-temperature gas, including exhaust gas, introduced from the kiln end 32 of the rotary kiln 30. The calcination section 24 includes, for example, a calcination furnace 26 and a rising duct 28.

[0023] The calciner 26 is a furnace body that performs calcination of the cement raw materials. The calciner 26 is connected to the bottom 32 of the rotary kiln 30 via a rising duct 28. The rising duct 28 guides 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 inside the calciner 26. The calciner 26 has a combustion mechanism (not shown) such as a burner that burns 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 inside the calciner 26 may be formed by the combustion gas from the burner or the like. In the calciner 26 (calcination section 24), limestone (calcium carbonate: CaCO3) contained in the cement raw materials is decarbonated by heat exchange between the cement raw materials and the high-temperature gas.

[0024] The calciner 26 sends the cement raw materials and high-temperature gas (the above-mentioned exhaust gas and combustion gas) for calcining the cement raw materials from its upper portion toward the cyclone C4. In the cyclone C4, the decarbonated (calcined) cement raw materials are separated from the high-temperature gas. The cement raw materials separated from the high-temperature gas after calcination are 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] (dispersion device) Next, the section where the cement raw materials are charged from the chute 22 to the calcination section 24 will be described in detail with reference to Figures 2 and 3. The chute 22 functions as a raw material charging section that charges the cement raw materials into the calcination section 24. The chute 22 charges the cement raw materials into either the calcination furnace 26 or the rising duct 28 of the calcination section 24. The following illustrates an example where the cement raw materials are charged from the chute 22 to the calcination furnace 26. The preheating calcination section 10 further has a dispersing device 70 that disperses the cement raw materials charged into the calcination furnace 26.

[0030] The dispersion device 70 is disposed inside the calciner 26. For example, the dispersion device 70 is attached to the side wall 26a of the calciner 26 formed in a cylindrical shape, or to the end of the chute 22 close to the calciner 26. The dispersion device 70 (the inlet of the raw materials through the chute 22) is disposed, in the vertical direction, for example, between the connection part between the calciner 26 and the rising duct 28 and the outlet of the gas and the cement raw materials from the calciner 26 to the cyclone C4. The dispersion device 70 may be attached to the side wall 26a of the calciner 26 or the end of the chute 22 via a fixing member. The dispersion device 70 is disposed at (in the vicinity of) the inlet of the cement raw materials from the chute 22 to the calciner 26. More specifically, the dispersion device 70 is disposed in an area (area indicated by "PA" in the drawing) through which the cement raw materials charged from the chute 22 can pass.

[0031] The dispersion device 70 has, for example, two dispersion plates 72 (see FIG. 3(a)). The dispersion plate 72 (dispersion member) is formed in a plate shape and is formed to extend along one direction. The dispersion plate 72 may be disposed substantially horizontally in the region PA, or may be disposed inclined with respect to the horizontal plane. When the dispersion plate 72 is substantially horizontal, the dispersion plate 72 is disposed so that a pair of main surfaces (upper and lower surfaces) of the dispersion plate 72 are substantially horizontal. The dispersion plate 72 is disposed so that its extending direction is from the side wall 26a toward the center (inside) of the calciner 26. Hereinafter, the extending direction of the dispersion plate 72 when the dispersion plate 72 is disposed horizontally is referred to as "direction D1".

[0032] One of the two dispersion plates 72 (dispersion member) and the other dispersion plate 72 (another dispersion member) are arranged side by side along a direction intersecting the extension direction of each dispersion plate 72. Specifically, the two dispersion plates 72 are arranged side by side along a direction intersecting (for example, a direction perpendicular to) the extension direction of each dispersion plate 72 as seen from the charging direction PD of the cement raw material by the chute 22. The charging 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 of the chute 22 connected to the calciner 26) extends. In one example, the two dispersion plates 72 are arranged side by side along the horizontal direction. For example, when the dispersion plates 72 are arranged horizontally, the two dispersion plates 72 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") (see also FIG. 3).

[0033] The angle between the charging direction PD of the cement raw material through the chute 22 and (the extension direction of) the distribution plate 72 is set to a predetermined angle in consideration of preventing the cement raw material from slipping down and staying. The angle between the charging direction PD and (the extension direction of) the distribution plate 72 may be, for example, 90° to 150°, 100° to 140°, or 110° to 130°. The angle between the distribution plate 72 and the side wall of the end of the chute 22 that is upstream of the distribution plate 72 may be 150° or less, 140° or less, or 130° or less in consideration of preventing the cement raw material from slipping down. The angle between the distribution plate 72 and the side wall of the end of the chute 22 that is upstream of the distribution plate 72 may be 90° or more, 100° or more, or 110° or more in consideration of preventing the cement raw material from staying.

[0034] One of the two dispersion plates 72 and the other dispersion plate 72 have the same shape except that they are line symmetrical, and are installed in the same manner. Therefore, one dispersion plate 72 will be described below. The dispersion plate 72 may be provided so as to be movable along its extending direction (for example, direction D1). More specifically, the dispersion plate 72 may be movable so that the range of the dispersion plate 72 exposed to the internal space of the calciner 26 changes. For example, the dispersion plate 72 is movable between a first position where the entire range that can be exposed to the internal space of the calciner 26 is exposed, and a second position where the entire range that can be exposed is not exposed. In this way, the dispersion plate 72 may be provided so as to be insertable and removable from the calciner 26 (or the chute 22).

[0035] For example, an insertion port 26b into which the dispersion plate 72 is inserted is formed in the side wall 26a of the calciner 26. The base end (the end farther from the center of the calciner 26) of the dispersion plate 72 of the calciner 26 is located outside the side wall 26a of the calciner 26. The preheating calcination unit 10 may further include a holding plate 92, a storage unit 94, and an operation unit 96. The holding plate 92 is a plate that holds the dispersion plate 72, and one end of the holding plate 92 is connected to the base end of the dispersion plate 72. The storage unit 94 is provided in a state connected to the portion of the side wall 26a of the calciner 26 where the insertion port 26b is located so as to protrude outward from the side wall 26a of the calciner 26, and stores the base end of the dispersion plate 72 and the holding plate 92.

[0036] The holding plate 92 is provided so as to be movable relative to the storage section 94 (for example, a rail, etc.). In other words, the holding plate 92 is movable relative to the storage section 94 in a state where it is attached to the storage section 94. The operation section 96 is operated, for example, by an operator, and converts the operation by the operator into a translational force along the direction D1 and transmits it to the holding plate 92. The holding plate 92 is moved along the direction D1 by the operation of the operation section 96 by the operator, so that the distribution plate 72 is movable along the direction D1. Note that the two distribution plates 72 are individually movable along the direction D1 by the operation of the corresponding operation section 96. That is, the two distribution plates 72 are provided so as to be individually movable. The configuration for making the distribution plate 72 movable along its extension direction is not limited to this example, and may be configured in any way.

[0037] Fig. 3(a) shows a top view illustrating a portion of the dispersion plate 72 that can be exposed to the internal space of the calciner 26. Fig. 3(b) shows a cross section taken along line III-III in Fig. 3(a). The dispersion plate 72 (exposable portion) is configured to disperse a portion of the cement raw material charged from the chute 22 without dispersing all of it, and to allow the remaining portion to pass downward. More specifically, the dispersion plate 72 has a main body portion 73a against which the cement raw material charged from the chute 22 hits, and a passage portion 73b through which the cement raw material charged from the chute 22 passes downward.

[0038] The main body 73a is a plate-shaped main body portion (plate member) of the dispersion plate 72. When the cement raw materials hit the main body 73a, the cement raw materials are prevented from passing downward, and the cement raw materials are dispersed. The passage portion 73b is formed in the main body 73a (plate member) so as to allow the cement raw materials charged from the chute 22 to pass downward.

[0039] An example of the passing portion 73b is a notch formed in the main body portion 73a. As shown in FIG. 3(a) or FIG. 3(b), one notch 74 may be formed in the main body portion 73a of the dispersion plate 72. The periphery forming the notch 74 is formed so as to be recessed inward in the peripheral region of the dispersion plate 72. More specifically, a part of the periphery of the dispersion plate 72 is formed so as to be recessed inward with respect to the imaginary rectangular periphery of the dispersion plate 72 when it is assumed that the notch 74 does not exist, and the recessed part forms the notch 74.

[0040] The notch 74 is formed in the tip 76 of the dispersion plate 72 (the end close to the center of the calciner 26). For example, the notch 74 extends along the direction D1 so as to separate the tip 76 of the dispersion plate 72 into two parts (hereinafter referred to as "parts 76a and 76b"). The notch 74 is a slit with one end open to the outside. The notch 74 is connected to an area outside the dispersion plate 72 when viewed from a direction perpendicular to the main surface of the dispersion plate 72. 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 separation distance between the part 76a and the part 76b may be approximately constant. The raw material toward the main body part 73a of the cement raw material charged from the chute 22 hits the main body part 73a and is dispersed. The raw material toward the cutout part 74 of the cement raw material charged from the chute 22 passes downward without hitting the dispersion plate 72.

[0041] The width of the cutout may vary depending on the position in the direction D1. For example, as shown in FIG. 4(a), the dispersion plate 72 may be provided with a cutout 74A functioning as the passage portion 73b instead of the cutout 74. In FIG. 4(a), one of the dispersion plates 72 is omitted from illustration. The width W of the cutout 74A may become smaller from the tip 76 toward the base end. Unlike the example shown in FIG. 4(a), the width W of the cutout 74A may become larger from the tip 76 toward the base end. Since the width W of the cutout 74A varies depending on the position in the direction D1, for example, the amount of cement raw material passing downward can be adjusted by adjusting the position in the direction D1 of the dispersion plate 72 in which the cutout 74A is formed.

[0042] The tip 76 of the dispersion plate 72 may be formed in a comb-tooth shape. For example, as shown in FIG. 4(b), the dispersion plate 72 may be provided with a plurality of cutouts 74B functioning as the passages 73b instead of the cutouts 74. The widths W of the plurality of cutouts 74B may be substantially the same as each other or may be different from each other. The lengths of the plurality of cutouts 74B in the direction D1 may be substantially the same as each other or may be different from each other. The peripheries forming the cutouts 74, 74A, and 74B are straight lines in the above example, but at least a portion of the peripheries forming the cutouts may be curved (e.g., arcs).

[0043] Another example of the passing portion 73b is a plurality of holes provided in the dispersion plate 72. As shown in FIG. 5(a) and FIG. 5(b), a plurality of holes 78 opening to a pair of main surfaces 72a, 72b of the dispersion plate 72 may be formed in the main body portion 73a of the dispersion plate 72. The main surface 72a is the upper surface of the dispersion plate 72, and the main surface 72b is the lower surface of the dispersion plate 72. That is, the plurality of holes 78 penetrate the main body portion 73a along the thickness direction of the main body portion 73a (plate member). The shape of the hole 78 (shape of the opening edge) may be circular, or may be elliptical or polygonal, unlike the example shown in FIG. 5(a). Each of the plurality of holes 78 is different from the above-mentioned cutout portion in that it is not open to the outside of the dispersion plate 72. The hole 78 is not connected to an area outside the dispersion plate 72 when viewed from a direction perpendicular to the main surface of the dispersion plate 72.

[0044] The diameters (e.g., diameters) of the holes 78 may be substantially the same as each other. The opening density of the holes 78 (the ratio of the openings of the holes to the unit area of ​​the distribution plate 72) may be uniform in the region in which the holes 78 are provided. The diameters of the holes 78 may be substantially constant even if the position in the thickness direction of the distribution plate 72 changes, and may become larger or smaller toward the bottom. Of the cement raw materials charged from the chute 22, raw materials heading toward the main body part (main body part 73a) where no holes 78 are formed hit the main body part and are dispersed. Of the cement raw materials charged from the chute 22, raw materials heading toward any of the holes 78 pass through the hole 78 and head downward.

[0045] In the dispersion plate 72, the opening density of the holes may vary depending on the position in the direction D1. For example, the dispersion plate 72 may have two or more types of holes having different diameters. As shown in FIG. 6, the dispersion plate 72 may have a plurality of holes 78A and a plurality of holes 78B. The region where the plurality of holes 78A are formed and the region where the plurality of holes 78B are formed are arranged in this order from the tip 76 of the dispersion plate 72. The diameters of the holes 78A and the holes 78B are different from each other. The diameter of the holes 78A is smaller than the diameter of the holes 78B. The number of the plurality of holes 78A is greater than the number of the plurality of holes 78B.

[0046] Unlike the example shown in FIG. 6, the diameter of the hole 78A may be larger than the diameter of the hole 78B. Regardless of the size relationship of the hole diameters, the number of the holes 78A may be the same as the number of the holes 78B, or may be smaller than the number of the holes 78B. By providing a plurality of types of holes with different diameters, for example, by adjusting the position in the direction D1 of the distribution plate 72 in which the plurality of holes 78A and 78B are formed, the amount of cement raw material passing downward can be adjusted. In the case where the plurality of holes 78 having the same diameter as described above are formed, the opening density of the holes may be changed by making the number of holes 78 different depending on the position in the direction D1.

[0047] Returning to FIG. 2, the preheating and calcining section 10 may have a discharge unit 88 that discharges a fluid for removing deposits of the cement raw materials toward the dispersing device 70 (dispersion plate 72). The discharge unit 88 is configured to be able to discharge the above-mentioned fluid toward the upper surface of the dispersion plate 72. The discharge unit 88 may discharge a gas in a pressurized state (hereinafter referred to as "high-pressure gas") as the above-mentioned fluid toward the main surface 72a, which is the upper surface of the dispersion plate 72. A gas supply device (not shown) that supplies the high-pressure gas is connected to the discharge unit 88. For example, the discharge unit 88 discharges the high-pressure gas toward approximately the entire upper surface of the portion of the dispersion plate 72 that is exposed to the inside of the calciner 26. The discharge unit 88 is configured to be able to discharge a high-pressure gas to the extent that the cement raw materials deposited on the upper surface of the exposed portion of the dispersion plate 72 are removed outside the dispersion plate 72.

[0048] [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 calcination section 24 (rising duct 28) 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.

[0049] More specifically, in the preheating and calcining process, the cement raw material generated in the previous process including the crushing 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. After that, the preheated cement raw material is charged from the chute 22 connecting the cyclone C3 and the calcining section 24 (calciner 26 or rising duct 28) toward the inside of the calcining section 24.

[0050] When the cement raw materials are charged from the chute 22, the charged cement raw materials are dispersed by the dispersion plate 72 provided near the inlet of the cement raw materials. Since the dispersion plate 72 is formed with a passage portion 73b through which the cement raw materials pass downward, a part of the cement raw materials charged from the chute 22 goes below the dispersion plate 72 without being dispersed by the dispersion plate 72. The cement raw materials dispersed by the dispersion plate 72 and the cement raw materials that have passed through the dispersion plate 72 are heat exchanged with high-temperature gas flowing upward in the calciner 26 and the rising duct 28. As a result, the decarbonation of the cement raw materials (calcination of the cement raw materials) is performed. While the preheating and calcining process is not being performed in the preheating and calcining unit 10, high-pressure gas may be discharged from the discharge portion 88 toward the upper surface of the dispersion plate 72.

[0051] The cement raw materials calcined in the calcination section 24 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.

[0052] 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, the dispersion plate 72 may have cutouts 74, 74A, 74B and a plurality of holes 78, 78A, 78B formed as the passage portion 73b. In the above example, the cutouts 74, 74A, 74B are provided on one side (the side farthest from the base end) of the tip of the dispersion plate 72, but may be formed on a different side connected to the side and extending along the direction D1.

[0053] In the above example, two dispersion plates 72 are installed, but one dispersion plate 72 may be installed, or three or more dispersion plates 72 may be set. In the above example, the dispersion plate 72 is moved (adjusted in position) by an operator, but the dispersion plate 72 may be moved along the direction D1 using a driving source such as a motor. When multiple dispersion plates 72 are installed, different types of dispersion plates 72 may be used. Multiple different types of dispersion plates 72 may be prepared in advance, and the dispersion plates 72 may be replaced depending on the operating status of the manufacturing apparatus 1. The dispersion plate 72 may be installed so that the angle with respect to the input direction PD of the cement raw material from the chute 22 is adjustable. The dispersion plate 72 may be fixed to a predetermined installation position.

[0054] The dispersion device 70 may have a plurality of rod-shaped members (hereinafter referred to as "rod members 82") instead of the dispersion plate 72. Figs. 7(a) and 7(b) show an example of the portions of the plurality of rod members 82 that are exposed to the internal space of the calciner 26. Each of the plurality of rod members 82 may be arranged to extend (horizontally) along the direction D1. The plurality of rod members 82 may be arranged side by side along the direction D2. The height positions of the plurality of rod members 82 may be substantially the same as each other or may be different from each other. The plurality of rod members 82 may be arranged at equal intervals from each other.

[0055] The cross-sectional shape of the rod member 82 may be circular, or, unlike the example shown in FIG. 7(b), may be elliptical or polygonal. The interval between adjacent rod members 82 may be shorter or longer than the diameter (length in the direction D2) of the rod member 82, or may be approximately equal to the diameter of the rod member 82. The raw material toward the rod members 82 of the cement raw material charged from the chute 22 hits the rod members 82 (upper surface) and is dispersed. That is, the multiple rod members 82 function as a main body. The raw material toward the gap between the rod members 82 of the cement raw material charged from the chute 22 passes between the adjacent rod members 82 and heads downward. That is, the space 84 located between the adjacent rod members 82 functions as a passing part.

[0056] [Effects of the embodiment] The cement clinker manufacturing apparatus 1 described above includes a calcination section 24 that calcines the cement raw materials with high-temperature gas including exhaust gas from the rotary kiln 30, a chute 22 (raw material charging section) that charges the cement raw materials into the calcination section 24, and a dispersion member that is disposed inside the calcination section 24 and disperses the cement raw materials charged from the chute 22. The dispersion member has a main body section against which the cement raw materials charged from the chute 22 hit, and a passage section that allows the cement raw materials charged from the chute 22 to pass downward.

[0057] When a dispersion member without a passage is used, almost all of the input cement raw material hits the dispersion member, and depending on the operating conditions, most of the cement raw material may be bounced back by the dispersion member toward the gas outlet at the top of the calciner 26 in the calciner section 24. In this case, heat exchange may not be sufficiently performed inside the calciner 26 (so-called short pass occurs), and the cement raw material may be introduced into the cyclone C4, which is the lowest cyclone, and the heat exchange efficiency may deteriorate. In addition, when a short pass occurs, the temperature of the high-temperature gas in the entire calciner 26 increases, and volatilization of the chlorine component contained in the cement raw material may occur in the upper part of the calciner 26. In this case, coating may grow at the outlet of the calciner 26 due to the influence of the volatilized chlorine, which may cause blockage of the flow path (flue) of the gas, etc.

[0058] In contrast, the dispersion member of the manufacturing apparatus 1 is provided with a passage, so that part of the cement raw material fed into the calcination section 24 is introduced below the dispersion member. This reduces the amount of cement raw material bouncing above the dispersion member, making it difficult for the above-mentioned short pass to occur. In addition, although the cement raw material is introduced into the region below the dispersion member, only a part of the cement raw material is introduced, so that suction at the extraction port to the chlorine bypass is unlikely to occur, and heat exchange between a part of the cement raw material and the high-temperature gas is also performed below the dispersion member. As a result, it is possible to improve the efficiency of heat exchange between the cement raw material and the high-temperature gas.

[0059] The dispersion member (dispersion plate 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. 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 1.

[0060] The manufacturing apparatus 1 may further include another dispersion member (another dispersion plate 72) that is disposed inside the calcination section 24 and disperses the cement raw materials fed from the chute 22. The dispersion member and the other dispersion member may be provided so as to be movable separately. In this case, since each dispersion member can be moved separately, it is easy to adjust the amount of dispersed cement raw materials. For example, fine adjustments can be made according to the operating conditions, and when the members are moved by an operator, the operability is improved due to the reduced weight.

[0061] The main body 73a of the dispersion plate 72 may be a plate member formed in a plate shape, and the passing portion 73b may be formed in the plate member. In this case, the plate member in which the passing portion 73b is formed may be disposed in the area PA through which the charged cement raw material passes, so that the device configuration is simplified.

[0062] Passing portion 73b may include notches 74, 74A, and 74B formed in main body 73a. In this case, one end of notches 74, 74A, and 74B is open to the outside, so that the passing portion can be easily formed.

[0063] The passage portion 73b may include a plurality of holes 78, 78A, 78B penetrating the main body portion 73a. In this case, since a thin portion is not formed on the periphery of the dispersion plate 72, it is possible to improve the durability of the dispersion plate 72.

[0064] The manufacturing apparatus 1 may further include a discharge unit 88 that discharges a fluid (high-pressure gas) toward the dispersion member to remove the cement raw material deposits on the dispersion member. In this case, the cement raw material deposited on the upper surface of the dispersion member can be removed by the removing fluid from the discharge unit 88, and the influence of the raw material powder adhering to the dispersion member on the operation of the manufacturing apparatus 1 can be suppressed. [Explanation of symbols]

[0065] 1...cement clinker manufacturing apparatus, 10...preheating calcination section, C1, C2, C3, C4...cyclones, 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 plate, 73a...main body, 73b...passage section, 74, 74A, 74B...notches, 78, 78A, 78B...holes, 88...discharge section.

Claims

1. a calcination section for calcining the cement raw materials using gas including exhaust gas from the rotary kiln; A raw material input section for inputting a cement raw material into the calcination section; A dispersing member is disposed inside the calcination section and disperses the cement raw material input from the raw material input section, The dispersion member has a main body portion against which the cement raw material charged from the raw material charging portion comes into contact, and a passage portion through which the cement raw material charged from the raw material charging portion passes downward, The dispersion member is formed to extend in one direction and is provided to be movable in the extension direction of the dispersion member, The calcination unit further includes another dispersing member disposed inside the calcination unit and dispersing the cement raw material input from the raw material input unit, The cement clinker manufacturing apparatus, wherein the dispersion member and the another dispersion member are provided so as to be independently movable.

2. The main body is a plate member formed into a plate shape, The manufacturing apparatus according to claim 1 , wherein the passage portion is formed in the plate member.

3. The manufacturing apparatus according to claim 2 , wherein the passage portion includes a notch portion formed in the plate member.

4. The manufacturing apparatus according to claim 2 or 3, wherein the passage portion includes a plurality of holes penetrating the plate member.

5. 5. The manufacturing apparatus according to claim 1, further comprising a discharge unit that discharges a fluid for removing deposits on the dispersion member toward the dispersion member.

6. The method includes the steps of: dispersing the cement raw materials introduced into the calcination section by dispersing the cement raw materials introduced into the calcination section; and dispersing the cement raw materials introduced into the calcination section by dispersing the cement raw materials introduced into the calcination section. The dispersion member has a main body portion against which the charged cement raw material comes into contact and a passage portion through which the charged cement raw material passes downward, The dispersion member is formed to extend in one direction and is provided to be movable in the extension direction of the dispersion member, The calcination unit further includes another dispersing member disposed inside the calcination unit and dispersing the cement raw material introduced into the calcination unit, A dispersion device, wherein the dispersion member and the another dispersion member are provided so as to be independently movable.

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