Manufacturing apparatus of cement clinker, and waste matter feeding device

Abstract

To improve treatment efficiency of waste matters.SOLUTION: A manufacturing apparatus of cement clinker comprises: a heating part which heats a cement raw material; and a waste matter feeding part which feeds waste matters including plastic waste to the heating part, where the waste matter feeding part has: a predetermined amount feeder which feeds the waste matters to a blowing port connected to the heating part such that an amount fed to the blowing port is maintained at a fixed level; and a service tank which sends out the waste matters toward the predetermined amount feeder while periodically changing an area for waste matters to be fed in a container where the waste matters are spread in an accumulated manner, the service tank sends out the waste matters such that a fluctuation range bulk density (kg / m3) per hour in the predetermined amount feeder becomes 35 or less, and the bulk density is obtained by dividing the weight (kg) of the waste matters in the predetermined amount feeder a volume (m3) inside by the predetermined amount feeder.SELECTED DRAWING: Figure 11

Description

[Technical Field]

[0001] The present disclosure relates to a cement clinker manufacturing apparatus and a waste feed apparatus. [Background technology]

[0002] Patent Document 1 discloses a cement clinker manufacturing device having a heating section that heats cement raw materials and a waste material supplying section that supplies waste materials including waste plastics to the heating section. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-44955 Summary of the Invention [Problem to be solved by the invention]

[0004] The present disclosure provides a cement clinker manufacturing device and a waste material supply device that are useful for improving waste material treatment efficiency when waste materials including waste plastics are used to heat cement raw materials. [Means for solving the problem]

[0005] [1] A system for manufacturing a cement processing plant, comprising: a heating unit for heating cement raw materials; and a waste supply unit for supplying waste including waste plastics to the heating unit, wherein the waste supply unit has a constant volume feeder for feeding the waste to an inlet passage connected to the heating unit so that the amount of waste supplied to the inlet passage is kept constant; and a service tank for feeding the waste toward the constant volume feeder while periodically changing an area to be fed in within a container in which the waste is piled up in a spread state, wherein the service tank is configured to feed the waste to the constant volume feeder at a rate of a volumetric load (kg / m) per hour. 3 The waste is fed so that the fluctuation range of the waste is 35 or less, and the volume is determined by dividing the weight (kg) of the waste in the constant volume feeder by the volume (m3 ) Cement clinker manufacturing equipment.

[0006] [2] The cement clinker manufacturing apparatus described in [1] above, wherein the service tank includes a screw feeder that discharges the waste accumulated in the container, and the screw feeder is configured to rotate around a first rotation axis so that the area to be discharged changes, while rotating around a second rotation axis to move the waste toward the first rotation axis.

[0007] [3] The cement clinker manufacturing apparatus described in [2] above, wherein the service tank includes an input section that receives the waste pressurized from a discharge path extending in a direction intersecting the first rotation axis and inputs the waste into the container from above, the input section being provided at a position through which the first rotation axis passes, and the input section includes an adjustment member for dispersing the waste, the adjustment member including a first part that adjusts the waste so that it is directed further back than the first rotation axis as viewed from the discharge path, and a second part that adjusts the waste so that it is directed further forward than the first rotation axis as viewed from the discharge path.

[0008] [4] The cement clinker manufacturing apparatus described in [3] above, wherein the adjustment member is installed so that, when observed from the direction in which the first rotation axis extends, the first portion and the second portion are inclined with respect to a direction perpendicular to the direction in which the delivery path extends.

[0009] [5] The cement clinker manufacturing apparatus described in any one of [1] to [4] above, wherein the waste supply unit further has a control unit that controls the constant volume feeder, and the constant volume feeder includes a storage unit having an inlet and an outlet, a moving member that can move the waste introduced from the inlet toward the outlet within the storage unit, and a motor that drives the moving member, and the control unit controls the rotation speed of the motor based on information indicating the current value of the volume weight and a target value for the amount of waste to be blown into the heating unit, so that the amount of waste supplied to the blowing path is maintained constant.

[0010] [6] The cement clinker manufacturing apparatus according to any one of the above [1] to [5], further comprising a coal supplying section that supplies coal to the heating section.

[0011] [7] The cement clinker manufacturing device according to any one of [1] to [6] above, wherein the waste material includes shredder dust, wood chips, plastic containers and packaging, and hard plastics.

[0012] [8] A waste supplying device that supplies waste including waste plastics to a heating section that heats cement raw materials, the device comprising: a constant volume feeder that supplies the waste to an inlet passage connected to the heating section so that the amount of waste supplied to the inlet passage is kept constant; and a service tank that delivers the waste to the constant volume feeder while periodically changing an area to be delivered in a container in which the waste is piled up in a spread state, the service tank being configured to deliver the waste to the constant volume feeder at a rate of a volumetric load (kg / m) per hour. 3 The waste is fed so that the fluctuation range of the waste is 35 or less, and the volume is determined by dividing the weight (kg) of the waste in the constant volume feeder by the volume (m 3 ) waste feeder. [Effects of the Invention]

[0013] According to the present disclosure, a cement clinker manufacturing apparatus and a waste material supplying apparatus are provided that are useful for improving waste material processing efficiency when waste materials including waste plastics are used to heat cement raw materials. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a schematic diagram showing an example of a cement clinker manufacturing apparatus. [Figure 2] FIG. 2 is a schematic diagram showing an example of a waste material supplying device. [Figure 3] Fig. 3(a) is a perspective view showing an example of a service tank, and Fig. 3(b) is a schematic view showing an example of the bottom of the service tank. [Figure 4] FIG. 4 is a perspective view showing a schematic example of a constant volume feeder. [Figure 5] FIG. 5 is a diagram illustrating an example of the control content in the constant volume feeder. [Figure 6] Figure 6(a) is a schematic diagram illustrating the state of the constant volume feeder when the capacity is small, and Figure 6(b) is a schematic diagram illustrating the state of the constant volume feeder when the capacity is large. [Figure 7] FIG. 7 is a graph showing the operating status of the device when blowing fluctuation occurs. [Figure 8] Fig. 8(a) is a diagram illustrating an example of the distribution of waste accumulated on the bottom wall of the service tank, and Fig. 8(b) is a graph illustrating an example of the change in volume over time in the constant volume feeder. [Figure 9] 9(a) and 9(b) are schematic diagrams illustrating the function of the adjusting member of the service tank. [Figure 10] FIG. 10 is a diagram illustrating the relationship between the arrangement of the adjusting members and the measurement results of the deposition distribution of waste. [Figure 11] FIG. 11 is a diagram illustrating the relationship between the arrangement of the adjusting member and the measurement results of the volumetric weight in the constant volume feeder. DETAILED DESCRIPTION OF THE INVENTION

[0015] An embodiment will be described below with reference to the drawings. In the description, identical elements or elements having the same functions are given the same reference numerals, and redundant description will be omitted. Furthermore, positional relationships such as up, down, left, and right will be based on the positional relationships shown in the drawings unless otherwise specified. Furthermore, the dimensional ratios of each element are not limited to those shown. Some drawings show an orthogonal coordinate system defined by the X-axis, Y-axis, and Z-axis. In the following description, the Z-axis direction is the vertical direction, and the X-axis and Y-axis directions are the horizontal directions.

[0016] [Cement clinker manufacturing equipment] Fig. 1 schematically shows a cement clinker manufacturing apparatus according to one embodiment. The manufacturing apparatus 1 (cement clinker manufacturing apparatus) shown in Fig. 1 is an apparatus that manufactures cement clinker by burning cement raw materials. The manufacturing apparatus 1 includes, for example, a preheater 10, a rotary kiln 30, a clinker cooler 38, a coal supply device 40, and a waste supply device 50.

[0017] The preheater 10 is a new suspension preheater (NSP). The preheater 10 preheats and calcines the cement raw materials using high-temperature gas, including exhaust gas from the rotary kiln 30, before the cement raw materials are fired in the rotary kiln 30. The high-temperature gas has a temperature sufficient to preheat and calcinate the cement raw materials. The preheater 10 has cyclones C1, C2, C3, and C4 (four cyclones), a calciner 14, a rising duct 16, and a raw material supply section 18. Unlike the example shown in FIG. 1, the number of cyclones provided in the preheater 10 may be five or more or three or less.

[0018] The cyclones C1, C2, C3, and C4 are arranged in this order from top to bottom, and each cyclone separates the cement raw materials (preheated raw materials) from the high-temperature gas. The calciner 14 is a furnace that calcines the cement raw materials using high-temperature gas, including the exhaust gas from the rotary kiln 30. The calciner 14 functions as a heating section that heats the cement raw materials. The heating temperature in the calciner 14 is, for example, approximately 700°C to 900°C. The calciner 14 is connected to the bottom 32 of the rotary kiln 30 via a rising duct 16. The rising duct 16 guides the exhaust gas from the rotary kiln 30 to the calciner 14. The exhaust gas from the bottom 32 of the rotary kiln 30 flows upward through the rising duct 16 and the calciner 14.

[0019] The calciner 14 has a burner (not shown) that mixes an energy source (fuel) such as coal with air and supplies combustion gas to the interior of the calciner 14. The high-temperature gas includes exhaust gas from the rotary kiln 30 and combustion gas from the burner of the calciner 14. Inside the calciner 14, a swirling flow that rises while swirling may be formed by the combustion gas from the burner. The high-temperature gas generated in the calciner 14 flows into cyclone C4 and then flows upward, passing through cyclones C3, C2, and C1 in this order.

[0020] The raw material supply unit 18 supplies the cement raw material produced in the previous process (raw material process) to the gas duct between cyclones C1 and C2. The supplied cement raw material descends through cyclones C1, C2, and C3 in this order, repeatedly undergoing heat exchange with high-temperature gas in the gas duct between the cyclones and separation from the high-temperature gas in the cyclones. The cement raw material separated from the high-temperature gas in cyclone C3 is introduced into the calciner 14. Heat exchange with the high-temperature gas in the calciner 14 decarbonates limestone (calcium carbonate: CaCO3) contained in the cement raw material. The calcined (decarbonated) cement raw material is introduced into cyclone C4 together with the high-temperature gas, separated from the high-temperature gas in cyclone C4, and then supplied to the kiln end 32 of the rotary kiln 30.

[0021] The rotary kiln 30 is a device that burns the cement raw materials after they have been preheated and calcined in the preheater 10. The rotary kiln 30 functions as a heating section that heats the cement raw materials. The heating temperature in the rotary kiln 30 is, for example, approximately 1000°C to 1500°C. The rotary kiln 30 has a main body 34 and a burner 36 provided at the rear end of the main body 34. The rotary kiln 30 produces cement clinker by heating the cement raw materials with combustion gas from the burner 36. The rotary kiln 30 discharges the produced cement clinker to a clinker cooler 38. The clinker cooler 38 cools the cement clinker using cooling air or the like.

[0022] The coal supply device 40 supplies coal to the rotary kiln 30. The coal supply device 40 supplies, for example, pulverized coal to the burner 36 of the rotary kiln 30. The pulverized coal is powdered or finely granulated coal. The coal supply device 40 may be capable of adjusting the amount of coal supplied (amount supplied per unit time). A control unit included in the coal supply device 40 may adjust the amount of coal supplied from the coal supply device 40 depending on the condition of the rotary kiln 30 (for example, the heating temperature).

[0023] (Waste feeding device) The waste supplying device 50 supplies waste containing plastic to the rotary kiln 30. The plastic contained in the waste (waste plastic) includes, for example, plastic fragments (scrap) generated in the process of manufacturing plastic products, and plastic products (portions thereof) that are no longer needed and discarded. The waste plastic may also include shredder dust from home appliances or automobiles. The waste supplied from the waste supplying device 50 may also include waste other than waste plastic, such as wood chips. Hereinafter, in this disclosure, waste containing plastic will be referred to as "waste W." The waste supplying device 50 functions as a waste supply unit that supplies the waste W. The waste W may include shredder dust, wood chips, plastic containers and packaging, and hard plastic.

[0024] In one example, the waste supply device 50 supplies waste material W to the burner 36 of the rotary kiln 30. The waste supply device 50 may be capable of adjusting the supply amount of waste material W (supply amount per unit time). The waste supply device 50 may supply waste material W so that the amount of waste material W supplied to the rotary kiln 30 per unit time is approximately constant. Details of the waste supply device 50 will be described below.

[0025] 2 is a schematic side view of the waste supplying apparatus 50. The waste supplying apparatus 50 includes, for example, a service tank 60, a constant volume supplying apparatus 70, and an inlet path 90. The service tank 60, the constant volume supplying apparatus 70, and the inlet path 90 are arranged in this order from upstream to downstream. In this disclosure, the terms "upstream" and "downstream" are used with reference to the flow of the waste W. In the manufacturing apparatus 1 including the waste supplying apparatus 50, the waste W is transported from upstream to downstream.

[0026] The service tank 60 is a tank that receives waste W delivered from a device disposed upstream of the waste supplying device 50 and temporarily stores the waste W. The service tank 60 delivers the waste W to the constant quantity supplying device 70 while periodically changing the delivery area within the container where the waste W is piled up in a spread state. As shown in FIGS. 2, 3(a), and 3(b), the service tank 60 has a container 66, an input section 62, and a screw feeder 68. Note that the screw feeder 68 is omitted from FIG. 3(a).

[0027] The container 66 is a portion that forms an internal space capable of accommodating the waste W. The container 66 is formed, for example, in a cylindrical shape extending in the vertical direction (Z-axis direction). The container 66 has an upper wall 66a, a bottom wall 66b, and a side wall 66c. The upper wall 66a is formed in a plate shape that extends horizontally. The outer edge of the upper wall 66a may be circular. The bottom wall 66b is disposed at a position separated from the upper wall 66a in the vertical direction and is formed in a plate shape that extends horizontally. The outer edge of the bottom wall 66b may be circular. In a plan view (viewed from above), the center of the upper wall 66a and the center of the bottom wall 66b may coincide. The side wall 66c is formed to extend vertically, with its upper end connected to the outer edge of the upper wall 66a and its lower end connected to the outer edge of the bottom wall 66b. The top wall 66a, the bottom wall 66b, and the side wall 66c define an interior space for containing waste W.

[0028] The input unit 62 is provided above the container 66 and is a part that receives the waste W pressure-fed from the delivery path 49 and feeds (introduces) the waste W into the container 66 from above. For example, in the manufacturing apparatus 1, foreign matter in the waste W is removed and the waste W is crushed, and the waste W is stored in a storage tank. Then, the waste W is pressure-fed (e.g., air-fed) from the storage tank and introduced into the input unit 62 via the delivery path 49. The delivery path 49 extends in a direction (e.g., a horizontal direction) that intersects with the rotation axis Ax1, which will be described later.

[0029] The input section 62 is provided at a position where the rotation axis Ax1 passes. The input section 62 may be provided in the central portion of the upper wall 66a. An opening connecting the interior of the input section 62 to the interior of the container 66 is provided in the central portion of the upper wall 66a. In a plan view, the input section 62 may be circular, and the outer edge of the input section 62 may be located more inward than the outer edge of the upper wall 66a. In FIG. 3(a) and other figures, the X-axis direction corresponds to the direction in which the delivery path 49 extends, and the positive direction of the X-axis represents the direction (orientation) in which the waste W is introduced from the delivery path 49 to the input section 62.

[0030] The input section 62 provided on the upper wall 66a inputs the waste W into the container 66 from above. The waste W input from the input section 62 is piled up on the bottom wall 66b. The input section 62 has the function of guiding the waste W into the internal space of the container 66 so that the input waste W is dispersed on the bottom wall 66b (i.e., so that it is not concentrated in a particular area). Details of the input section 62 will be described later. The waste W is piled up in a spread state on the upper surface of the bottom wall 66b.

[0031] The screw feeder 68 is a device that feeds out the waste W accumulated in the container 66. The screw feeder 68 is provided on the upper surface of the bottom wall 66b. The screw feeder 68 is configured to rotate around a rotation axis Ax1 (first rotation axis) so that the area to be fed changes, and to rotate around a rotation axis Ax2 (second rotation axis) to move the waste W toward the rotation axis Ax1. The rotation axis Ax1 may be a vertical axis extending along the Z-axis direction. The rotation axis Ax1 is set, for example, to approximately coincide with the center of the circular bottom wall 66b. The screw feeder 68 is formed to extend in one direction along the upper surface of the bottom wall 66b, and rotates to revolve around the rotation axis Ax1.

[0032] The rotation axis Ax2 is an axis set perpendicular to the rotation axis Ax1. The rotation axis Ax2 is set to pass through the screw feeder 68, and the screw feeder 68 rotates about the rotation axis Ax2. A drive mechanism for rotating the screw feeder 68 about the rotation axis Ax1 and a drive mechanism for rotating the screw feeder 68 about the rotation axis Ax2 are connected to the screw feeder 68. The screw feeder 68 (its screw portion) is configured to move the waste material W toward the rotation axis Ax1 as it rotates about the rotation axis Ax2.

[0033] As shown in FIGS. 3(a) and 3(b), the upper surface of the bottom wall 66b can be divided into multiple areas SA arranged in order around the rotation axis Ax1. The multiple areas SA are virtually divided areas and have the same area. Each area SA is fan-shaped with the rotation axis Ax1 as its center. The upper surface of the bottom wall 66b may be divided into four or more areas SA, for example, eight, twelve, or sixteen areas SA. The following description will be given using an example in which the upper surface of the bottom wall 66b is divided into twelve areas SA.

[0034] Each of the 12 areas SA is an area from which the revolving screw feeder 68 sends out the waste material W downstream at a certain point in time. As the screw feeder 68 rotates around the rotation axis Ax1, the area to which the waste material W is sent (the area to be sent out) changes sequentially among the 12 areas SA arranged around the rotation axis Ax1. When focusing on a certain area SA, after the screw feeder 68 has passed through that area SA, when the screw feeder 68 has made one revolution, that area SA again becomes the area to be sent out.

[0035] As described above, the area to be discharged changes periodically within the container 66 as the rotating screw feeder 68 revolves around its axis of rotation. In one example, the screw feeder 68 rotates around the rotation axis Ax1 so as to complete one rotation in approximately 10 to 60 minutes. A discharge port is provided in the center of the bottom wall 66b, and waste W that has moved toward the rotation axis Ax1 as the screw feeder 68 rotates around the rotation axis Ax2 is discharged from the container 66 through the discharge port.

[0036] 2, constant volume supply device 70 has a mixing hopper 72 and constant volume supply device 80. In constant volume supply device 70, mixing hopper 72 and constant volume supply device 80 are arranged in this order from upstream. Mixing hopper 72 is a device that mixes waste W delivered from service tank 60. Mixing hopper 72 delivers waste W to constant volume supply device 80 without adjusting the amount delivered.

[0037] Constant volume feeder 80 is a device that feeds waste W to blowing passage 90 so that the amount (amount fed per unit time) fed to blowing passage 90 is maintained constant. As shown in Fig. 4, constant volume feeder 80 has, for example, a storage section 82, a moving member 88, and a motor 92.

[0038] The storage section 82 is a portion that forms an internal space S that can store waste W. The storage section 82 is formed, for example, in a cylindrical shape that expands in a direction intersecting the vertical direction. The storage section 82 has an upper wall 82a, a bottom wall 82b, and a side wall 82c. The upper wall 82a is formed in a plate shape that expands in the horizontal direction. The outer edge of the upper wall 82a may be circular. The bottom wall 82b is formed in a plate shape that expands in the horizontal direction. The outer edge of the bottom wall 82b may be circular.

[0039] In a plan view, the center of the top wall 82a and the center of the bottom wall 82b may coincide with each other. The side wall 82c is formed to extend vertically, with its upper end connected to the outer edge of the top wall 82a and its lower end connected to the outer edge of the bottom wall 82b. The side wall 82c extends in the circumferential direction around a line passing through the centers of the top wall 82a and the bottom wall 82b. The internal space S is defined by the top wall 82a, the bottom wall 82b, and the side wall 82c.

[0040] An inlet 84 is formed in the upper wall 82a, connecting the internal space S with a space outside the internal space S. Waste W from the mixing hopper 72 is introduced into the internal space S through the inlet 84. The constant quantity feeder 80 may have a guide pipe 83. The guide pipe 83 is provided to pass through the inlet 84. The guide pipe 83 has an upper end connected to the discharge outlet of the mixing hopper 72 and is formed to extend downward. The lower end of the guide pipe 83 is located below the upper wall 82a and extends to the internal space S. When the inlet 84 is circular, the guide pipe 83 is formed in a cylindrical shape. A portion of the cylindrical portion of the guide pipe 83 located in the internal space S may be cut out.

[0041] A discharge port 86 is formed in the bottom wall 82b, connecting the internal space S with a space outside the internal space S. The waste W stored in the internal space S is discharged to the outside of the internal space S through the discharge port 86. The constant-quantity feeder 70 may have a discharge pipe 79 connected to the discharge port 86. One end of the discharge pipe 79 is connected to the discharge port 86, and forms a path that guides the waste W discharged from the internal space S to the blowing path 90.

[0042] In a plan view, the inlet 84 and the outlet 86 are provided at different positions. For example, in a plan view, when observed in the circumferential direction around the center of the circular top wall 82a, the center of the inlet 84 and the center of the outlet 86 may be offset by approximately 180°. The size of the inlet 84 may be approximately 1 / 5 to 1 / 10 of the size of the top wall 82a. The size of the outlet 86 may be approximately 1 / 5 to 1 / 10 of the size of the bottom wall 82b.

[0043] The moving member 88 is a member capable of moving the waste W introduced from the inlet 84 toward the outlet 86 within the storage section 82 (internal space S). The moving member 88 is provided on the upper surface of the bottom wall 82b in the internal space S. The moving member 88 includes, for example, a rotating body 89a and a plurality of plate-like members 89b. In the example shown in FIG. 4, the moving member 88 includes four plate-like members 89b. The rotating body 89a is formed in a cylindrical shape and is rotatable around a vertical rotation axis Ax3. The rotation axis Ax3 is set to pass through the centers of the top wall 82a and the bottom wall 82b and the central axis of the cylindrical rotating body 89a.

[0044] The plurality of plate-shaped members 89b are formed to extend radially from the side surface of the rotating body 89a. The plurality of plate-shaped members 89b may be arranged at equal intervals in the circumferential direction about the rotation axis Ax3. Each of the plurality of plate-shaped members 89b is formed in a plate shape that extends in a plane passing through the rotation axis Ax3 (in the vertical direction and one horizontal direction). Each of the plurality of plate-shaped members 89b moves around the rotation axis Ax3 along the upper surface of the bottom wall 82b.

[0045] The motor 92 is a member that drives the moving member 88. The motor 92 may rotate the rotating body 89a so that the plurality of plate-like members 89b move in the circumferential direction about the rotation axis Ax3. The motor 92 may be provided inside the rotating body 89a or outside the internal space S.

[0046] As the motor 92 drives the plurality of plate-like members 89b to rotate, the waste W contained in the internal space S moves around the rotation axis Ax3. When the waste W located at a position corresponding to the inlet 84 is moved by one of the plate-like members 89b to a position corresponding to the outlet 86, at least a portion of the waste W is discharged from the outlet 86. The waste W discharged from the outlet 86 is introduced into the blowing path 90 via the discharge pipe 79, for example.

[0047] Returning to FIG. 2 , the blowing passage 90 is connected to the rotary kiln 30 and is a line through which the waste material W discharged from the constant volume feeder 80 is blown (introduced) into the burner 36 of the rotary kiln 30 using air or the like. In this disclosure, the amount of waste material W supplied from the blowing passage 90 to the burner 36 per unit time is defined as the "blow-in amount." By maintaining the blowing amount of waste material W into the burner 36 at an arbitrarily set target value, i.e., by continuing to supply a constant amount of waste material W, the rotary kiln 30 can obtain a constant amount of heat, and the heating temperature of the rotary kiln 30 can be maintained at a desired temperature (e.g., approximately 1450°C).

[0048] 4, the waste supplying device 50 has a control unit 100. The control unit 100 is a computer that controls the constant volume supply device 80. The control unit 100 has, for example, a hardware configuration including a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and an input / output interface.

[0049] The amount of waste W blown into burner 36 depends on the amount supplied from constant volume feeder 80 to blowing path 90. Therefore, control unit 100 controls constant volume feeder 80 so that the amount of waste W supplied from constant volume feeder 80 to blowing path 90 is maintained constant according to a target value of the blowing amount (hereinafter referred to as "target amount TA"). The target amount TA related to the blowing amount is arbitrarily set by the operator of manufacturing apparatus 1, for example.

[0050] The control unit 100 is connected to at least the motor 92. The control unit 100 controls the rotation speed of the motor 92 so that the amount of waste W supplied to the blowing path 90 is constant, for example, based on information indicating the current value of the volume weight in the constant volume feeder 80 and the target amount TA. The volume weight in the constant volume feeder 80 (hereinafter referred to as "volume weight WV") is defined as follows: Volume WV: The weight (kg) of the waste W in the constant volume feeder 80 is expressed as the volume (m 3 )

[0051] Volume (m 3 ) can be found by subtracting the volume of components such as moving member 88 present in internal space S from the volume of internal space S connected to the outside via inlet 84 and outlet 86. In the example shown in FIG. 4, the volume of internal space S is the volume of the space (internal space S itself) defined by top wall 82a and inlet 84, bottom wall 82b and outlet 86, and side wall 82c. The volume (m 3 ) can be said to be the volume of the space within the internal space S that can be filled with waste W.

[0052] The waste supplying device 50 has a weight sensor 110. The weight sensor 110 is a sensor that acquires information indicating the weight of the constant volume feeder 80. The weight sensor 110 outputs the acquired information to the control unit 100. By measuring the weight of the constant volume feeder 80 using the weight sensor 110 when there is no waste W inside the constant volume feeder 80, the weight (kg) of the waste W inside the constant volume feeder 80 can be determined from the information from the weight sensor 110. Alternatively, the weight sensor 110 itself may acquire the weight (kg) of the waste W inside the constant volume feeder 80 as a measured value.

[0053] Volume weight WV (kg / m 3 ), the rotation speed of the motor 92, and the amount of waste W blown into the burner 36 have the relationship of the following formula (1). Blowing volume = volume weight × rotation speed × coefficient (1) The coefficient is a fixed value that is determined depending on the individual constant volume feeder 80. As shown in formula (1), the blowing amount varies depending on the volume weight WV and the rotation speed of the motor 92. In other words, as shown in Fig. 5, by maintaining the value obtained by multiplying the volume weight WV by the rotation speed of the motor 92 constant, it is possible to make the blowing amount follow the target amount TA.

[0054] The volume weight WV (weight of the waste W in constant volume feeder 80) depends on the amount of waste W sent from service tank 60 to constant volume feeder 80. The rotation speed of motor 92 can be adjusted by the power (e.g., current value) supplied from control unit 100. From the above, control unit 100 controls the rotation speed of motor 92 according to information indicating the current value of volume weight WV so that the blowing amount follows target amount TA and becomes constant. The rotation speed of motor 92 can be obtained by modifying equation (1) as shown in the following equation (2). Number of times = blowing amount / (volume × coefficient) (2) For example, in equation (2), the control unit 100 calculates the rotation speed of the motor 92 to be controlled by inputting the current value of the volume weight WV with the blowing amount set as the target volume TA. The control unit 100 may repeatedly control the rotation speed of the motor 92 according to the current value of the volume weight WV at a predetermined control period.

[0055] Figure 6(a) schematically shows how the waste W is moved by the moving member 88 when the volume weight WV is relatively large, and Figure 6(b) schematically shows how the waste W is moved by the moving member 88 when the volume weight WV is relatively small. Referring also to Figure 5, when the volume weight WV is relatively large, the rotation speed of the motor 92 is reduced to slow down the movement speed of the moving member 88. On the other hand, when the volume weight WV is relatively small, the rotation speed of the motor 92 is increased to speed up the movement speed of the moving member 88. This makes it possible to keep the blowing amount constant (maintain the target amount TA) even if the volume weight WV, which correlates with the amount of waste W in the constant volume feeder 80, fluctuates.

[0056] (Issues before countermeasures) Here, to facilitate understanding of the contents of the present disclosure, we will explain issues that may arise with the waste material supplying device 50 before the technology of the present disclosure is applied. In the following explanation, the state before the technology of the present disclosure is applied will be referred to as "before the countermeasure," and the state after the technology of the present disclosure is applied will be referred to as "after the countermeasure." When the rotation speed of the motor 92 is controlled based on the current value of the volume weight WV so that the injection amount follows the target amount TA, a phenomenon (state) called "injection fluctuation" may occur. Injection fluctuation refers to a phenomenon (state) in which waste material W is not injected from the injection path 90 into the burner 36 of the rotary kiln 30, or the injection amount is extremely reduced.

[0057] 7 is a graph showing the time-dependent changes in the measured blowing amount, the measured volume weight WV, and the measured rotation speed of the motor 92 when the waste feeder 50 was operated before the countermeasures were implemented. The graph in FIG. 7 shows the time-dependent changes in the measured values ​​of the blowing amount, the volume weight WV, and the rotation speed of the motor 92 over a two-hour period. When observing the blowing amount in the graph in FIG. 7, two blowing fluctuations occurred in which the blowing amount significantly decreased from the target amount TA.

[0058] In controlling the rotation speed using the above-mentioned formula (1) or (2), when the volume weight WV decreases, i.e., when the amount of waste W in constant volume feeder 80 decreases, the rotation speed of motor 92 increases. If the volume weight WV remains small, even if the movement speed of moving member 88 is increased by motor 92, there will be no waste W available for discharge in constant volume feeder 80, and waste W will temporarily be unable to be supplied to blowing path 90. This can cause the above-mentioned blowing oscillation.

[0059] When injection fluctuations occur and the fixed-rate supply of waste W is stopped, the temperature inside the rotary kiln 30 drops, which is an inconvenience. If the temperature inside the rotary kiln 30 drops, the target amount TA of waste W injection must be reduced and the coal supply rate from the coal supply device 40 must be increased to stabilize the operation of the waste supply device 50. The target amount TA must then be gradually (stepwise) returned to its original value. For example, if injection fluctuations occur when the target amount TA is set to 7 t / h, the target amount TA must be reduced to 2 t / h to stabilize the supply of waste W, and then the target amount TA must be gradually increased to 3 t / h, 4 t / h, . . . , and 7 t / h. To reduce CO2 emissions, it is desirable to reduce the amount of coal used and increase the amount of waste W used. However, injection fluctuations result in an increase in the amount of coal used and a decrease in the amount of waste W used.

[0060] Therefore, in order to identify the cause of blowing fluctuations from the viewpoint of suppressing the occurrence of blowing fluctuations, the inventors conducted a thorough investigation into the behavior of the service tank 60 and constant quantity feeder 80 before countermeasures were taken. Figure 8(a) shows the results of measuring the distribution of waste W on the bottom wall 66b of the service tank 60 before countermeasures were taken.

[0061] In FIG. 8(a), the weight (kg / m) of the waste W in each of the areas SA on the bottom wall 66b is 3 ) are shown. In plan view, one area SA of the multiple areas SA overlaps with the delivery path 49 connected to the input unit 62, and this area SA is referred to as "area SA1." Area SA1 is the area to be delivered that is closest to the delivery path 49 in plan view. The remaining multiple areas SA other than area SA1 are referred to as "areas SA2 to SA12" in order clockwise around the rotation axis Ax1.

[0062] The weight (kg / m) of waste W for each area SA shown in Fig. 8(a) 3 ) is the result of calculation by a worker entering the container 66 of the service tank 60 during a certain time period and manually measuring the weight of the waste W for each area SA. Specifically, the volume weight (kg / m 3 ) was calculated by an operator sampling waste W in the container 66, filling the waste W into a container of known volume (approximately 200 mm in diameter x 200 mm in height), and then calculating the weight of the container after filling. From the measurement results shown in FIG. 8(a), it can be seen that the volume weight in the area (areas SA1 and SA12) close to the delivery path 49 indicated by "A" is larger than the area (areas SA6 and SA7) far from the delivery path 49 indicated by "B". In other words, there is a bias in the distribution of the amount of waste W on the bottom wall 66b.

[0063] FIG. 8(b) shows the transition (time change) of the measured volume weight WV and the measured blowing volume in constant volume feeder 80 before the countermeasure was taken. Observing the transition of the blowing volume reveals that the blowing volume is maintained constant. On the other hand, observing the volume weight WV reveals that the volume weight WV fluctuates periodically, with repeated peaks and valleys. In the graph of FIG. 8(b), the peaks indicated by "A" are the measurement results when screw feeder 68 of service tank 60 was delivering waste W from areas SA1 and SA12. In the graph of FIG. 8(b), the valleys indicated by "B" are the measurement results when screw feeder 68 was delivering waste W from areas SA6 and SA7.

[0064] As described above, the inventors investigated the behavior of the service tank 60 and constant volume feeder 80 before the countermeasures were implemented, and discovered that unevenness in the amount of waste W on the bottom wall 66b caused the volume weight WV in the constant volume feeder 80 to decrease, resulting in periodic valleys. The inventors then predicted that the above-mentioned blow-in fluctuations would occur as the degree of decrease in volume weight WV increased, and that blow-in fluctuations could be suppressed by alleviating the unevenness in the amount of waste W on the bottom wall 66b. Below, the service tank 60 and constant volume feeder 80 after the countermeasures were implemented based on this prediction will be described, but unless otherwise specified, the terms "service tank 60" and "constant volume feeder 80" refer to those after the countermeasures were implemented.

[0065] (Details of measures) The service tank 60 is a constant volume feeder 80. The constant volume feeder 80 is a constant volume feeder. 3 The waste material W is fed so that the fluctuation range of the volume weight WV per hour is 35 or less. The fluctuation range of the volume weight WV per hour is defined as the difference between the maximum volume weight WV and the minimum volume weight WV within that hour. The service tank 60 is configured to feed the waste material W so that the fluctuation range of the volume weight WV (kg / m) per hour in the constant volume feeder 80 is 35 or less. 3 The waste material W may be discharged so that the fluctuation range of the value of the weight of the waste material W is 32 or less, 30 or less, 28 or less, 26 or less, or 24 or less.

[0066] The extent to which the volume weight WV fluctuates in the constant volume feeder 80 depends on the degree of unevenness in the amount of waste W in the multiple areas SA on the bottom wall 66b. For this reason, the service tank 60 is provided with a volume weight WV (kg / m 3 ) fluctuation range is set to 35 or less. 3 ) to be 35 or less, the service tank 60 is provided with a member that can reduce unevenness in the amount of waste W in the multiple areas SA on the bottom wall 66b. In one example, the input section 62 of the service tank 60 has an adjustment member for dispersing the waste W.

[0067] 9(a) and 9(b), the input section 62 may have a first adjustment member 63 and a second adjustment member 64. The first adjustment member 63 includes a first portion 63a that adjusts the waste W so that it is directed further back than the rotation axis Ax1 when viewed from the discharge path 49. The first portion 63a may have a surface that is inclined with respect to both the Z-axis direction and the horizontal plane. The angle θ at which the first portion 63a is inclined with respect to the horizontal plane may be 30° to 60° (for example, 45°).

[0068] The second adjustment member 64 includes a second portion 64a that adjusts the waste W so that it is directed forward of the rotation axis Ax1 when viewed from the discharge path 49. The second portion 64a may be a surface that extends in one direction parallel to the Z-axis direction. The second portion 64a may be positioned farther from the discharge path 49 (toward the back) than the first portion 63a. The length of the second portion 64a in the Z-axis direction may be longer than the length of the first portion 63a in the Z-axis direction. A notch may be provided in the lower half of the second adjustment member 64 so that a slit is formed in the second portion 64a.

[0069] It is not necessary for all of the waste W introduced through the discharge path 49 to come into contact with the first portion 63a and the second portion 64a and fall into the container 66. It is not necessary for all of the waste W that hits the first portion 63a to move further back than the rotation axis Ax1 as viewed from the discharge path 49. It is sufficient that the first portion 63a is formed and arranged so that, when the waste W that hits the first portion 63a is continuously observed, the amount of waste W that moves further back than the rotation axis Ax1 after coming into contact with the first portion 63a is greater than the amount of waste W that moves forward than the rotation axis Ax1.

[0070] It is not necessary for all of the waste W that hits the second portion 64a to move forward from the rotation axis Ax1 as viewed from the discharge path 49. The second portion 64a only needs to be formed and positioned so that, when the waste W that hits the second portion 64a is continuously observed, the amount of waste W that moves forward from the rotation axis Ax1 after coming into contact with the second portion 64a is greater than the amount of waste W that moves backward from the rotation axis Ax1. In the example shown in Figures 9(a) and 9(b), it is considered that larger waste W hits the first portion 63a in the front and falls backward, and smaller waste W hits the second portion 64a in the back and falls forward.

[0071] When observed from the direction in which the rotation axis Ax1 extends, the first portion 63a and the second portion 64a may be arranged in a state perpendicular to the direction in which the delivery path 49 extends (X-axis direction) (see "(i) Perpendicular" in FIG. 10). When the first portion 63a is perpendicular to the X-axis direction when observed from the direction in which the rotation axis Ax1 extends, one horizontal component of the direction in which the surface constituting the first portion 63a extends is perpendicular to the X-axis direction.

[0072] When the second portion 64a is perpendicular to the X-axis direction when observed from the direction in which the rotation axis Ax1 extends, one horizontal component of the direction in which the surface constituting the second portion 64a extends is perpendicular to the X-axis direction. The first portion 63a and the second portion 64a may be disposed so as to be line-symmetric with respect to an imaginary plane that passes through the center of the cross section of the delivery path 49 and is along the XZ plane.

[0073] From the viewpoint of adjusting the degree to which the uneven distribution of the waste W on the bottom wall 66b is reduced, the first adjustment member 63 and the second adjustment member 64 may be installed so that, when observed from the direction in which the rotation axis Ax1 extends, the first portion 63a and the second portion 64a are inclined with respect to the direction perpendicular to the extension of the delivery path 49 (the Y-axis direction). In one example, the first portion 63a and the second portion 64a may be disposed at a position rotated by an arbitrary predetermined angle around the rotation axis Ax1 from a position that is line-symmetric with respect to the virtual plane (see, for example, "(ii) 20°" in FIG. 10).

[0074] When the first portion 63a is tilted with respect to the Y-axis direction when observed from the direction in which the rotation axis Ax1 extends, one horizontal component of the direction in which the surface constituting the first portion 63a extends is tilted with respect to the Y-axis direction. When the second portion 64a is tilted with respect to the X-axis direction when observed from the direction in which the rotation axis Ax1 extends, one horizontal component of the direction in which the surface constituting the second portion 64a extends is tilted with respect to the Y-axis direction. When the rotation axis Ax1 is a vertical axis, observation from the direction in which the rotation axis Ax1 extends is equivalent to a planar view.

[0075] (Evaluation example) The degree of inclination of the first portion 63a and the second portion 64a when observed from the direction of the rotation axis Ax1 was gradually changed, and the distribution of the amount (volume) of the waste W on the bottom wall 66b and the change in the volume WV over time were measured, and then an evaluation was made as to whether or not the above-mentioned blowing fluctuation occurred. Specifically, the evaluation was made under the following four conditions. "(i) Vertical": In plan view, the first portion 63a and the second portion 64a are disposed perpendicular to the direction in which the delivery path 49 extends. (ii) Rotated by 20°: In plan view, the first portion 63a and the second portion 64a were rotated by 20° with respect to a direction perpendicular to the direction in which the delivery path 49 extended. "(iii) Rotated by 30°": In plan view, the first portion 63a and the second portion 64a were rotated by 30° with respect to a direction perpendicular to the direction in which the delivery path 49 extended. "(iv) Rotated by 40°": In plan view, the first portion 63a and the second portion 64a were rotated by 40° with respect to a direction perpendicular to the direction in which the delivery path 49 extended.

[0076] At each of the 20°, 30°, and 40° rotations, the first adjustment member 63 and the second adjustment member 64 were both positioned at a position rotated by the corresponding angle in the circumferential direction from the vertically positioned position, with the rotation axis Ax1 (the center of the bottom wall 66b) as the reference. The distribution of the amount (volume) of waste W on the bottom wall 66b was obtained by having a worker enter the container 66 at a certain time and measure the weight of the waste W for each area SA at that time. Figure 10 shows the measurement results of the distribution representing the volume weight of waste for each area SA on the container 66.

[0077] The control unit 100 controlled the rotation speed of the motor 92 in accordance with the measured value of the volume weight WV so that the blowing amount followed the target volume TA set in accordance with the operating status of the manufacturing apparatus 1 at the time of evaluation under each condition. 3 The graph shows the time changes of the measured values ​​of the temperature (t / h) and the measured values ​​of the blowing rate (t / h) over a part of the evaluation period.

[0078] In the measurement results shown in FIG. 10 , comparing the vertical arrangement with the 20° rotation, it can be seen that the 20° rotation reduces the difference in the volume weight of the waste W between the areas SA by the first adjustment member 63 and the second adjustment member 64. Comparing the 20° rotation with the 30° rotation, it can be seen that the 30° rotation reduces the difference in the volume weight of the waste W between the areas SA by the first adjustment member 63 and the second adjustment member 64. Comparing the 30° rotation with the 40° rotation, it can be seen that the 40° rotation did not further reduce the difference in the volume weight of the waste W between the areas SA, and the difference in volume weight between the areas SA increased compared to the 30° rotation. As described above, it was discovered that the degree to which the difference in the volume weight of the waste W between the areas SA can be reduced can be adjusted by rotating and positioning the adjustment member including the first portion 63a and the second portion 64a around the rotation axis Ax1 in a plan view.

[0079] In FIG. 11, "fluctuation range" refers to the fluctuation range of the volume weight WV per hour in constant volume feeder 80. The fluctuation range (fluctuation range) is the difference between the maximum and minimum values ​​of the volume weight WV within one hour of evaluation. In the measurement results shown in FIG. 10, the degree of deviation in the volume weight of waste W for each area SA increases in the order of vertical, 20° rotation, 40° rotation, and 30° rotation. Similarly, the fluctuation range (fluctuation range) related to the volume weight WV shown in FIG. 11 also increases in the order of vertical, 20° rotation, 40° rotation, and 30° rotation. This shows that the fluctuation range of the volume weight WV in constant volume feeder 80 can be reduced by reducing the deviation in the volume weight (accumulation amount) of waste W for each area SA in service tank 60 and then supplying waste W from service tank 60 to constant volume feeder 80.

[0080] 11, the above-mentioned blowing fluctuation was not observed during the period shown in the graph, but the evaluation was continued for more than one day while the manufacturing apparatus 1 was in operation, and blowing fluctuation occurred when the apparatus was vertical, rotated 20°, and rotated 40°. On the other hand, blowing fluctuation did not occur when the apparatus was rotated 30°. From the above results, it can be seen that adjusting the fluctuation range of the volume weight WV per hour in constant quantity feeder 80 to 35 or less, 32 or less, 30 or less, 28 or less, 26 or less, or 24 or less is effective in reducing the possibility of blowing fluctuation.

[0081] (Variation) In the above example, the first portion 63a and the second portion 64a are formed in separate adjustment members, but a single integrated adjustment member may include two portions having similar functions as the first portion 63a and the second portion 64a.

[0082] Any configuration may be used to reduce the difference in the amount of waste W between areas SA (to disperse the waste W on the bottom wall 66b) as long as the fluctuation range of the volume weight WV per hour in constant quantity feeder 80 is 35 or less. For example, in input section 62, one or more of the position, angle around rotation axis Ax1, elevation angle, size, shape, and number of adjustment members for dispersing waste W may be adjusted so that the fluctuation range is 35 or less.

[0083] In addition to the rotary kiln 30, the waste supplying device 50 may supply waste to the calciner 14, which functions as a heating unit for heating the cement raw materials. In this case, the waste supplying device 50 may have a service tank 60 and a constant volume feeder 80 that adjust the amount of waste W to be supplied to the calciner 14, in addition to the service tank 60 and constant volume feeder 80 that adjust the amount of waste W to be supplied to the rotary kiln 30. The waste supplying device 50 may supply waste to the calciner 14 instead of the rotary kiln 30. The constant volume feeder 80 of the waste supplying device 50 may supply waste W to an injection path connected to the calciner 14 so that the amount supplied to the injection path is constant.

[0084] The coal supply device 40 may supply coal (e.g., pulverized coal) to the calciner 14 in addition to or instead of the rotary kiln 30. In one example among the various examples described above, at least some of the features described in the other examples may be combined.

[0085] Summary of this disclosure The manufacturing apparatus (1) described above includes a heating section (14, 30) that heats cement raw materials, and a waste supply section that supplies waste (W) including waste plastics to the heating section (14, 30). The waste supply section (50) includes a constant volume feeder (80) that supplies the waste (W) to the blowing passage (90) connected to the heating section (14, 30) so that the amount of waste (W) supplied to the blowing passage (90) is kept constant, and a service tank (60) that delivers the waste (W) to the constant volume feeder (80) while periodically changing the delivery area (SA) within the container (66) where the waste (W) is piled up in a spread state. The service tank (60) is configured to deliver the waste (W) to the constant volume feeder (80) at a constant volume WV (kg / m) per hour. 3 The waste (W) is fed so that the fluctuation range of the waste (W) is 35 or less. The volume weight WV is calculated by multiplying the weight (kg) of the waste (W) in the constant volume feeder (80) by the volume (m 3 ) can be calculated by dividing by

[0086] As described above, the volumetric load WV (kg / m) per hour in the constant volume feeder (80) 3 By setting the fluctuation range of the waste (W) to 35 or less, it is possible to avoid a situation in which the waste (W) in the constant volume feeder (80) becomes too small and the waste (W) is not supplied from the constant volume feeder (80) to the blowing path (90). In other words, it is possible to avoid the occurrence of the blowing fluctuation described above. If blowing fluctuation occurs, the amount of waste (W) used and treated in the manufacturing apparatus (1) will decrease. In contrast, in the manufacturing apparatus (1), the waste (W) is sent from the service tank (60) to the constant volume feeder (80) so that the fluctuation range is 35 or less, so blowing fluctuation is unlikely to occur. This makes it possible to avoid a decrease in the amount of waste (W) treated due to blowing fluctuation. This is therefore useful for improving the waste (W) treatment efficiency.

[0087] In the manufacturing apparatus (1) described above, the service tank (60) may include a screw feeder (68) that delivers the waste (W) accumulated in the container (66). The screw feeder (68) may be configured to rotate about a first rotation axis (Ax1) so as to change the delivery area (SA), while rotating about a second rotation axis (Ax2) to move the waste (W) toward the first rotation axis (Ax1). In this case, it is easy to deliver the waste (W) toward a downstream device while periodically changing the delivery area (SA).

[0088] In the manufacturing apparatus (1) described above, the service tank (60) may include an input unit (62) that receives the waste (W) pressure-fed from the discharge path (49) extending in a direction intersecting the first rotation axis (Ax1) and inputs the waste (W) from above into the container (66). The input unit (62) may be provided at a position through which the rotation axis (Ax1) passes. The input unit (62) may include adjustment members (63, 64) for dispersing the waste (W). The adjustment members (63, 64) may include a first portion (63a) that adjusts the waste (W) so that it is directed further back than the rotation axis (Ax1) when viewed from the discharge path (49), and a second portion (63b) that adjusts the waste (W) so that it is directed further forward than the rotation axis (Ax1) when viewed from the discharge path (49). In this case, the capacity WV (kg / m 3 The distribution of the amount of waste (W) deposited in the container (66) can be adjusted so that the fluctuation range of the amount of waste (W) deposited in the container (66) is 35 or less.

[0089] In the manufacturing apparatus (1) described above, the adjusting members (63, 64) may be installed so that the first portion (63a) and the second portion (64a) are inclined with respect to a direction perpendicular to the direction in which the delivery path (49) extends when observed from the direction in which the rotation axis (Ax1) extends. In this case, the capacity WV (kg / m) can be adjusted by simply adjusting the positions of the adjusting members (63, 64). 3 The distribution of the amount of waste (W) deposited in the container (66) can be adjusted so that the fluctuation range of the volume weight WV (kg / m) is 35 or less. 3This simplifies the preparation work for the equipment to keep the fluctuation range of the temperature (V) to 35 or less.

[0090] In the manufacturing apparatus (1) described above, the waste supply unit (50) may further include a control unit (100) that controls the constant volume feeder (80). The constant volume feeder (80) may include a storage unit (82) having an inlet (84) and an outlet (86), a moving member (88) that is capable of moving the waste (W) introduced through the inlet (84) toward the outlet (86) within the storage unit (82), and a motor (92) that drives the moving member (88). The control unit (100) may control the rotation speed of the motor (92) based on information indicating the current volume weight WV and a target value (TA) for the amount of waste (W) to be blown into the heating unit (14, 30) so that the amount of waste (W) supplied to the blowing path (90) is maintained constant. When the rotation speed of the motor 92 is controlled as described above in the manufacturing apparatus 1, the present inventors have inferred that the blowing fluctuation is caused by the large fluctuation range of the volume weight WV from the behavior of the service tank 60 and the constant volume feeder 80 when the actual manufacturing apparatus 1 is in operation. Based on this, it has been confirmed that the blowing fluctuation can be avoided by configuring the service tank 60 so that the fluctuation range of the volume weight WV falls within a certain range.

[0091] The manufacturing apparatus (1) described above may further include a coal supply unit (40) that supplies coal to the heating unit (14, 30). The manufacturing apparatus (1) described above avoids the occurrence of a period during which the waste (W) cannot be injected into the heating unit (14, 30). This also makes it possible to suppress an increase in the amount of coal used.

[0092] In the manufacturing apparatus 1 described above, the waste W may include shredder dust, wood chips, plastic containers and packaging, and hard plastics. The manufacturing apparatus 1 described above aims to improve the processing efficiency of the waste W. Therefore, the shredder dust, wood chips, plastic containers and packaging, and hard plastics can be more effectively utilized in the production of cement clinker.

[0093] The waste supplying device (50) described above is a device for supplying waste (W) including waste plastics to the heating section (14, 30) that heats cement raw materials. The waste supplying device (50) includes a constant volume feeder (80) that supplies the waste (W) to the blowing passage (90) connected to the heating section (14, 30) so that the amount of waste supplied to the blowing passage (90) is kept constant, and a service tank (60) that delivers the waste (W) to the constant volume feeder (80) while periodically changing the delivery area (SA) within the container (66) where the waste (W) is piled up in a spread state. The service tank (60) is configured to deliver the waste (W) to the constant volume feeder (80) at a constant volume WV (kg / m) per hour. 3 The waste (W) is fed so that the fluctuation range of the waste (W) is 35 or less. The volume weight WV is calculated by multiplying the weight (kg) of the waste (W) in the constant volume feeder (80) by the volume (m 3 ) This waste supply device (50) is useful for improving the efficiency of treating the waste (W) in the same way as the manufacturing device (1).

[0094] (Addendum) The present disclosure includes the following configurations of Supplementary Note 1 and Supplementary Note 2.

[0095] [Appendix 1] A heating unit for heating cement raw materials; a waste supply unit that supplies waste including waste plastic to the heating unit, The waste supply unit includes: a constant volume feeder that feeds the waste material to the blowing passage connected to the heating unit so that the amount of waste material fed to the blowing passage is kept constant; a service tank that periodically changes an area to be discharged within a container in which the waste is piled up in a spread state and discharges the waste toward the constant quantity feeder; the service tank includes an input section that receives the waste pressure-fed from a delivery path extending in a direction intersecting the first rotation axis and inputs the waste into the container from above, The input unit is provided at a position through which the first rotation axis passes, the input section includes an adjustment member for dispersing the waste; The manufacturing apparatus includes a first portion that adjusts the waste so that it is directed further back than the first rotation axis when viewed from the discharge path, and a second portion that adjusts the waste so that it is directed further forward than the first rotation axis when viewed from the discharge path.

[0096] [Appendix 2] The manufacturing apparatus described in Appendix 1, wherein the adjustment member is installed so that, when observed from the direction in which the first rotation axis extends, the first portion and the second portion are inclined with respect to a direction perpendicular to the direction in which the delivery path extends. [Explanation of symbols]

[0097] 1...manufacturing apparatus (cement clinker manufacturing apparatus), 14...calciner, 30...rotary kiln, 40...coal supply device, 49...discharge path, 50...waste supply device, 60...service tank, 62...feeding section, 63...first adjustment member, 63a...first part, 64...second adjustment member, 64a...second part, 66...container, 68...screw feeder, Ax1, Ax2...rotation axis, SA...area (area to be sent out), 80...quantitative feeder, 82...storage section, 88...moving member, 92...motor, 90...inlet path, 100...control section.

Claims

1. a heating section for heating the cement raw material; a waste supply unit that supplies waste including waste plastic to the heating unit, The waste supply unit includes: a constant volume feeder that feeds the waste material to the blowing passage connected to the heating unit so that the amount of waste material fed to the blowing passage is kept constant; a service tank that periodically changes an area to be discharged within a container in which the waste is piled up in a spread state and discharges the waste toward the constant quantity feeder; The service tank is configured to supply the volume (kg / m) of the constant volume feeder per hour. ３ ) is discharged so that the fluctuation range of the waste is 35 or less, The volumetric weight is the weight (kg) of the waste in the constant volume feeder divided by the volume (m ３ ) Cement clinker manufacturing equipment.

2. The service tank includes a screw feeder that delivers the waste material accumulated in the container; 2. The cement clinker manufacturing apparatus according to claim 1, wherein the screw feeder is configured to rotate about a first rotation axis so that the target area for delivery changes, and to rotate about a second rotation axis to move the waste material toward the first rotation axis.

3. the service tank includes an input section that receives the waste pressure-fed from a delivery path extending in a direction intersecting the first rotation axis and inputs the waste into the container from above, The input unit is provided at a position through which the first rotation axis passes, the input section includes an adjustment member for dispersing the waste; 3. The cement clinker manufacturing apparatus according to claim 2, wherein the adjustment member includes a first portion that adjusts the direction of the waste material so that it is directed further back than the first rotation axis as viewed from the discharge path, and a second portion that adjusts the direction of the waste material so that it is directed further forward than the first rotation axis as viewed from the discharge path.

4. 4. The cement clinker manufacturing apparatus according to claim 3, wherein the adjustment member is installed so that, when observed from the direction in which the first rotation axis extends, the first portion and the second portion are inclined with respect to a direction perpendicular to the direction in which the delivery path extends.

5. The waste supply unit further includes a control unit that controls the constant quantity supply device, The constant volume feeder comprises: a storage section provided with an inlet and an outlet; a moving member capable of moving the waste introduced from the inlet toward the outlet within the storage unit; a motor that drives the moving member; 5. The cement clinker manufacturing apparatus according to claim 1, wherein the control unit controls the rotation speed of the motor based on information indicating the current volume weight and a target value for the amount of the waste to be blown into the heating unit so that the amount of the waste supplied to the blowing passage is maintained constant.

6. The cement clinker manufacturing apparatus according to any one of claims 1 to 4, further comprising a coal supplying unit that supplies coal to the heating unit.

7. 5. The cement clinker manufacturing apparatus according to claim 1, wherein the waste material includes shredder dust, wood chips, plastic containers and packaging, and hard plastics.

8. A waste material supplying device that supplies waste material including waste plastics to a heating section that heats cement raw materials, a constant volume feeder that feeds the waste material to the blowing passage connected to the heating unit so that the amount of waste material fed to the blowing passage is kept constant; a service tank that periodically changes an area to be discharged within a container in which the waste is piled up in a spread state and discharges the waste toward the constant quantity feeder; The service tank is configured to supply the volume (kg / m) of the constant volume feeder per hour. ３ ) is discharged so that the fluctuation range of the waste is 35 or less, The volumetric weight is the weight (kg) of the waste in the constant volume feeder divided by the volume (m ３ ) by dividing the waste feeder.

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