Chlorine bypass facility, cement clinker manufacturing apparatus, cement clinker manufacturing method, chlorine bypass facility operation method, and chlorine-containing waste treatment method

Abstract

To provide a technique capable of suppressing closing of an extraction steam pipe.SOLUTION: A chlorine bypass facility 90 comprises: an extraction hole 21A for extracting a kiln exhaust gas from a tail of a furnace 52 of a cement kiln 50, a rising duct 42 or a space therebetween; a classifying part 22 for separating coarse powder of raw material dust from an extraction gas extracted through the extraction hole 21A, for acquiring a derivation gas having a temperature of 770°C or greater and including fine powder of the raw material dust; an extraction steam pipe 21 for coupling the extraction hole 21A and the classifying part 22, and being heat insulated by the heat insulation member; and an exhaust gas supply part 20 supplying a high temperature exhaust gas into the extraction steam pipe 21.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a chlorine bypass facility, a cement clinker manufacturing apparatus, a cement clinker manufacturing method, a chlorine bypass facility operating method, and a chlorine-containing waste treatment method. [Background technology]

[0002] In cement clinker manufacturing plants, efforts are being made to use various waste materials as raw materials and thermal energy. For these reasons, the amount of chlorine brought into cement kilns tends to increase. Many cement clinker manufacturing plants are equipped with chlorine bypass equipment to reduce the amount of chlorine in the cement kiln, and technology is being considered for efficiently removing chlorine from the bleed gas bled by this chlorine bypass equipment. Patent Document 1 proposes a technology in which coarse particles are separated from the bleed gas bled from the kiln exhaust gas passage in a classifier while maintaining the temperature of the bleed gas bled from the kiln exhaust gas passage at 770°C or higher, and then the chlorine bypass dust is separated by cooling the bleed gas to 600°C or lower. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-55900 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the method described in Patent Document 1, the temperature of the extracted gas is maintained at 770° C. or higher before being introduced into the classifier, and therefore the bleed pipe leading to the classifier needs to be insulated. In such a bleed pipe, the accumulation of raw material dust cannot be suppressed by introducing cooling air into the bleed pipe, and therefore there is a problem that the bleed pipe is easily clogged.

[0005] The present disclosure has been made in consideration of the above, and aims to provide a technique capable of suppressing the occurrence of blockage of the air bleed pipe. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, a chlorine bypass equipment according to one embodiment of the present disclosure includes an extraction port that extracts kiln exhaust gas from the bottom of a cement kiln, a rising duct, or a space between them, a classification unit that separates coarse raw material dust particles from the extraction gas extracted from the extraction port and obtains an outlet gas having a temperature of 770°C or higher containing fine raw material dust particles, an extraction pipe that connects between the extraction port and the classification unit and is insulated by a thermal insulation member, and an exhaust gas supply unit that supplies high-temperature exhaust gas into the inside of the extraction pipe.

[0007] In the above-mentioned chlorine bypass system, dust in the extraction pipe is removed by supplying high-temperature exhaust gas to the inside of the extraction pipe insulated by the heat insulating member. Therefore, clogging of the extraction pipe due to accumulation of dust is suppressed.

[0008] The exhaust gas supply unit may be configured to supply the exhaust gas so as to flow along an inner wall of the air bleed pipe. By supplying the exhaust gas so as to flow along the inner wall of the air bleed pipe as described above, it is possible to remove accumulated dust over a wide area. Therefore, it is possible to reduce the possibility of the air bleed pipe being clogged due to accumulation of dust.

[0009] In an embodiment, the exhaust gas supply unit has a discharge port into the inside of the bleed gas pipe, the discharge port extending in a direction intersecting with an extension direction of the flow path of the bleed gas. With the above configuration, the exhaust gas can be supplied to a wider range inside the bleed gas pipe, and dust can be removed more efficiently.

[0010] The exhaust gas may be a gas obtained by burning a pyrolysis gas generated by thermally treating plastics. By adopting the above-mentioned configuration, it becomes possible to recover chlorine contained in the pyrolysis gas generated by thermally treating plastics as clinker dust.

[0011] The exhaust gas may be a gas extracted from a second extraction port different from the extraction port of the cement kiln to which the extraction port is connected, or a gas extracted from a cement kiln different from the cement kiln. With the above configuration, dust in the extraction pipe can be removed by using gas generated from existing equipment.

[0012] The exhaust gas supply unit may further include a dust measuring unit that measures an amount of dust accumulated inside the air extraction pipe, and the exhaust gas supply unit may adjust the supply amount of the exhaust gas based on the amount of dust accumulated inside the air extraction pipe measured by the dust measuring unit. By adopting the above configuration, it is possible to reduce the possibility that the inside of the air extraction pipe is clogged due to dust accumulation, and it is possible to realize stable operation of the chlorine bypass facility.

[0013] A cement clinker production apparatus according to an aspect of the present disclosure includes any one of the chlorine bypass facilities described above. Since the cement clinker production apparatus includes the chlorine bypass facility described above, clogging of the air extraction pipe due to dust accumulation is suppressed.

[0014] A method for producing cement clinker according to an aspect of the present disclosure produces cement clinker using the above-mentioned cement clinker production apparatus. Since the method for producing cement clinker uses the above-mentioned chlorine bypass facility to produce cement clinker, clogging of the air extraction pipe due to dust accumulation is suppressed.

[0015] A method for operating a chlorine bypass system according to one embodiment of the present disclosure includes an extraction process for obtaining kiln exhaust gas from the bottom of a cement kiln, a rising duct, or a space between them, a classification process for introducing the extracted gas obtained in the extraction process through an extraction pipe insulated by a thermal insulation member, separating coarse particles of raw material dust from the extracted gas, and obtaining an outlet gas having a temperature of 770°C or higher containing fine particles of the raw material dust, and an exhaust gas supply process for supplying high-temperature exhaust gas into the inside of the extraction pipe.

[0016] According to the above-mentioned method for operating the chlorine bypass system, the dust in the extraction pipe is removed by supplying high-temperature exhaust gas to the inside of the extraction pipe insulated by the insulating member. Therefore, the occurrence of blockage of the extraction pipe due to accumulation of dust is suppressed.

[0017] A chlorine-containing waste treatment method according to one embodiment of the present disclosure is a method for treating chlorine-containing waste using a cement clinker production apparatus, and includes the following steps: a feeding step of feeding the chlorine-containing waste into a cement kiln as a cement raw material and / or thermal energy for cement burning; an extraction step of obtaining kiln exhaust gas from the end of the cement kiln, a rising duct, or a space between them; a classification step of introducing the extracted gas obtained in the extraction step through an extraction pipe insulated by an insulating member, separating coarse powder of raw material dust from the extracted gas, and obtaining an output gas having a temperature of 770°C or higher containing fine powder of the raw material dust; and an exhaust gas supply step of supplying high-temperature exhaust gas into the inside of the extraction pipe.

[0018] According to the above-mentioned chlorine-containing waste treatment method, the dust in the bleed pipe is removed by introducing high-temperature exhaust gas into the inside of the bleed pipe insulated by the heat insulating member. Therefore, the occurrence of blockage of the bleed pipe due to dust accumulation is suppressed. Furthermore, by treating the chlorine-containing waste with the above-mentioned cement clinker manufacturing apparatus, it becomes possible to stably operate the chlorine bypass facility, and it is possible to efficiently treat a large amount of chlorine. Effect of the Invention

[0019] According to the present disclosure, a technique is provided that can reduce the occurrence of blockage of the air bleed pipe. [Brief description of the drawings]

[0020] [Figure 1] FIG. 1 is a diagram showing a chlorine bypass facility according to one embodiment and a cement clinker production apparatus equipped with the facility. [Diagram 2] 2(a), 2(b), and 2(c) are schematic diagrams for explaining the configuration around the air extraction pipe. [Diagram 3] 3(a) and 3(b) are schematic diagrams illustrating another configuration around the air extraction pipe. [Figure 4] FIG. 4 is a cross-sectional view showing a radial cross section of an outlet gas flow path to which a cooling gas inlet is connected. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings as needed. However, the following embodiment is an example for explaining the present disclosure, and is not intended to limit the present disclosure to the following content. In the description, the same reference numerals are used for the same elements or elements having the same functions, and redundant descriptions are omitted as needed. In addition, the positional relationships such as up, down, left, right, etc. are based on the positional relationships shown in the drawings unless otherwise specified. Furthermore, the dimensional ratios of each element are not limited to the ratios shown in the drawings.

[0022] [Cement clinker manufacturing equipment] 1 is a diagram showing a chlorine bypass equipment according to one embodiment and a cement clinker manufacturing apparatus equipped with the same. The chlorine bypass equipment 90 is connected to a rising duct 42 of a preheating and calcining section 40 of a cement clinker manufacturing apparatus 100. The chlorine bypass equipment 90 recovers volatile matters such as chlorine content in the cement clinker manufacturing apparatus 100 as clinker dust, and reduces the chlorine content in the cement clinker manufacturing apparatus 100. The cement clinker manufacturing apparatus 100 may be configured to include a control unit 10.

[0023] The chlorine bypass equipment 90 has an extraction port 21A that extracts gas from the rising duct 42, and an extraction pipe 21 through which the extraction gas containing raw material dust extracted from the extraction port 21A flows. The chlorine bypass equipment 90 also includes a classifier 22 that is connected to the extraction pipe 21 and separates coarse particles of the raw material dust from the introduced extraction gas to obtain an output containing fine particles of raw material dust smaller than the coarse particles, a flow path 24 through which the output gas flows, and a cooling gas introduction part 80 that introduces a cooling gas so as to generate a swirling flow in the flow path 24.

[0024] The air extraction pipe 21 has a function of supplying the extracted gas extracted from the air extraction port 21A to the classifying section 22.

[0025] The bleed gas bled from the bleed port 21A contains raw material dust and gaseous chlorine. The bleed gas flows through the bleed pipe 21 and is introduced into the classification section 22. The bleed pipe 21 may be one called an bleed probe. The temperature of the bleed gas when introduced into the classification section 22 is preferably higher than 770°C, more preferably 820°C or higher, and even more preferably 860°C or higher, from the viewpoint of preventing volatilized chlorine such as KCl and NaCl from precipitating alone or on the surface of the raw material dust and adhering to the classification section 22 as clinker dust.

[0026] The extraction pipe 21 is provided with an exhaust gas supply unit 20 that supplies high-temperature exhaust gas into the extraction pipe 21. Fig. 1 shows, as an example of the exhaust gas supply unit 20, a configuration in which exhaust gas generated in a combustion furnace 32 in a waste plastic desalination facility 30 is supplied to the extraction pipe 21 through a flow path 33. In other words, the flow path 33 can function as the exhaust gas supply unit 20. Furthermore, the extraction pipe 21 is provided with a dust measurement unit 37 for measuring the amount of dust accumulated inside the extraction pipe 21.

[0027] The waste plastic desalting equipment 30 that supplies exhaust gas will be described. The waste plastic desalting equipment 30 is an equipment that performs desalting treatment of a thermal energy source including waste plastic. The waste plastic desalting equipment 30 has a desalting furnace 35 that heat-treats the thermal energy source including waste plastic. The combustion furnace 32 is a furnace that combusts tar contained in the pyrolysis gas generated in the desalting furnace 35.

[0028] The exhaust gas supplied to the extraction pipe 21 by the exhaust gas supply unit 20 is not limited to the exhaust gas from the combustion furnace 32 of the waste plastic desalination facility 30, and may be, for example, exhaust gas from a combustion furnace other than the combustion furnace 32 of the waste plastic desalination facility 30. For example, high-temperature exhaust gas from a combustion furnace, an ammonia gasification furnace, a sulfur combustion furnace, or a combustion furnace or melting furnace other than these provided in a biomass pellet carbonization facility may be used as the exhaust gas. One of these exhaust gases may be used alone, or a combination of multiple exhaust gases may be used.

[0029] Furthermore, the exhaust gas may be gas extracted from an exhaust port (second exhaust port) different from the exhaust port 21A in the cement kiln 50. Also, gas extracted from a cement kiln different from the cement kiln 50 included in the cement clinker manufacturing apparatus 100 may be used as the exhaust gas. When introducing the exhaust gas from an exhaust port different from the exhaust port 21A in the cement kiln 50, for example, it is preferable to provide an exhaust port for extracting the exhaust gas in a position near the exhaust port 21A where the raw material dust is difficult to extract. When the raw material dust extracted from the exhaust port 21A contains a large amount of dust that has fallen out of the calciner 44 of the preheating calcination section 40, by providing a different exhaust port (second exhaust port) below the exhaust port 21A, the raw material dust is difficult to extract from the different exhaust port (second exhaust port). On the other hand, if the raw material dust extracted from the extraction port 21A contains a large amount of dust stirred up from the kiln end 52 of the cement kiln 50, by providing a different extraction port (second extraction port) above the extraction port 21A, the raw material dust is less likely to be extracted from the different extraction port (second extraction port).

[0030] The temperature of the exhaust gas when it is supplied to the extraction pipe 21 exceeds 770° C., more preferably is 820° C. or higher, and further preferably is 860° C. or higher. Therefore, the flow path 33 into which the exhaust gas is introduced may have, for example, a thermally insulated structure.

[0031] Next, the bleed pipe 21 and the exhaust gas supply unit 20 will be described with reference to FIG. 2. FIG. 2 is a diagram for explaining the configuration of the bleed pipe 21 and its periphery. FIG. 2(a) is a diagram showing a portion below the center of the bleed pipe 21 in a state in which the exhaust gas supply unit 20 is attached to the bleed pipe 21, FIG. 2(b) is a perspective view showing a schematic view of the inside of the bleed pipe 21, and FIG. 2(c) is a cross-sectional view along the extension direction of the bleed pipe 21. FIGS. 2(a) to 2(c) are views showing a part of the bleed pipe 21, in the vicinity of a region where the exhaust gas supply unit 20 is provided. FIG. 2(b) is a schematic view showing only the space inside the bleed pipe 21 (inside the pipe wall 211). The flow of the bleed gas in the bleed pipe 21 is indicated by an arrow F1, and the flow of the exhaust gas is indicated by an arrow F2.

[0032] As shown in FIG. 2(b), the air bleed pipe 21 is a cylindrical pipe having a cross section of a flow path (a cross section perpendicular to the extending direction of the air bleed pipe 21) that is, for example, circular. The air bleed pipe 21 may have a pipe wall 211 made of a material having high thermal insulation performance. As the material having thermal insulation performance that constitutes the air bleed pipe 21, for example, fireproof bricks or the like may be used. Further, another thermal insulation material or a heat retention device such as a heater may be arranged so as to surround the periphery of the air bleed pipe 21.

[0033] Further, the bleed pipe 21 is provided with an opening 212 that communicates the inside and outside of the pipe. The opening 212 is provided below near the bottom surface of the bleed pipe 21 so as to penetrate the pipe wall 211 (and the heat insulating member if one is provided around the bleed pipe), for example, as shown in Figs. 2(a) to 2(c). This opening 212 can function as a discharge port when supplying high-temperature exhaust gas to the inside of the bleed pipe 21. The opening 212 can be elongated, for example, as shown in Figs. 2(a) and 2(b). When the opening 212 is elongated, the longitudinal extension direction is not particularly limited, but the opening 212 may be formed so as to extend along a direction intersecting the extension direction of the bleed pipe 21, as shown in Fig. 2(a). In this embodiment, the opening 212 is formed so as to extend along a direction perpendicular to the extension direction of the bleed pipe 21.

[0034] The flow path 33 functioning as the exhaust gas supply unit 20 is connected to the opening 212 as shown in FIG. 2(c). When high-temperature exhaust gas is supplied from the flow path 33 in a connected state, the exhaust gas is introduced into the extraction pipe 21 from the opening 212. While the combustion furnace 32 is in operation, the exhaust gas may be constantly supplied through the flow path 33. In addition, the flow path 33 may be provided with a damper 34 (see FIG. 1) for adjusting the amount of air sent to the extraction pipe 21. The damper 34 may be controlled by the control unit 10.

[0035] Supplying the exhaust gas can scatter the dust D accumulated at the bottom of the extraction pipe 21. The inside of the extraction pipe 21, into which the high-temperature bleed gas is introduced, is maintained at a high temperature (for example, 770°C or higher) as a result of insulation by the insulating member. Therefore, the dust D present in the extraction pipe 21 has low adhesion. Therefore, when the exhaust gas is supplied near the bottom of the extraction pipe 21, the dust D in the area from which the exhaust gas flows can be scattered. The scattered dust D can move downstream (towards the classification section 22) along the flow of the bleed gas F1. As a result, the retention and accumulation of the dust D in the extraction pipe 21 can be reduced.

[0036] The exhaust gas F2 can be supplied by suction using a suction fan, which will be described later. At this time, the exhaust gas F2 is supplied along the bottom surface of the extraction pipe 21, thereby increasing the flow velocity in the vicinity of the wall surface of the extraction pipe 21, where the flow velocity of the extraction gas is usually slow. As a result, accumulation of dust D in the extraction pipe 21 can be suppressed.

[0037] By providing the opening 212 in the air extraction pipe 21 in a region where the dust D can accumulate, it is possible to promote the movement of the dust D by the exhaust gas supplied from the opening 212. The flow rate of the exhaust gas supplied from the opening 212 to the air extraction pipe 21 may be adjusted, for example, to an extent that the dust D can move.

[0038] By supplying the exhaust gas into the extraction pipe 21, the exhaust gas merges with the extracted gas, and a mixed gas is obtained. The flow rate of the exhaust gas may be adjusted according to the operating conditions of the cement clinker production apparatus 100 or the chlorine bypass equipment 90. The flow rate of the exhaust gas may be adjusted, for example, based on a measurement unit that measures operating information of the extracted gas flow path 24, the classifying unit 22, the extraction pipe 21, the rising duct 42, and the cement kiln 50 (kiln bottom 52), and / or the chlorine concentration of the clinker dust recovered in the recovery unit 72. Specifically, the flow rate of the exhaust gas may be adjusted manually by an operator or automatically using the control unit 10 based on operating information (e.g., temperature) of the classifying unit 22 and / or the chlorine concentration of the clinker dust recovered in the recovery unit 72.

[0039] The exhaust gas supply unit (the location where the flow path 33 and the bleed pipe 21 are connected and the opening 212 is formed) may be installed at a plurality of locations in the bleed pipe 21. The supply of the exhaust gas may be performed to suppress the accumulation of dust D. Therefore, by forming the opening 212 and connecting the exhaust gas flow path 33 in a location where the dust D is expected to easily accumulate, the possibility of the inside of the pipe being blocked by the accumulation of dust D can be reduced. Examples of the location where the dust D is likely to accumulate include a portion of the bleed pipe 21 where the flow path is bent (bend portion) and a location near the classification section 22 where the flow of the bleed gas F1 may change. By providing the exhaust gas supply unit 20 in such a location and supplying high-temperature exhaust gas, the risk of the flow path being blocked by dust D can be reduced.

[0040] Furthermore, since the exhaust gas is maintained at a high temperature, even if the exhaust gas is constantly supplied, a decrease in the temperature of the gas flowing through the air extraction pipe 21 is suppressed. Specifically, the temperature of the gas flowing through the air extraction pipe 21 is maintained so that the temperature of the gas when it is introduced into the classifier section 22 is 770°C or higher. This makes it possible to suppress the accumulation of dust D while maintaining the gas temperature.

[0041] Also, the dust measurement unit 37 (see FIG. 1) may be used to detect the amount of dust accumulation, and the supply amount of high-temperature exhaust gas may be adjusted depending on the result. One method for detecting the amount of dust accumulation is, for example, to measure the temperature inside or outside the air extraction pipe 21. When dust D accumulates in the air extraction pipe 21, the presence of the dust D reduces the temperature of that area. Therefore, the dust measurement unit 37 may be configured to detect the amount of dust D accumulation by attaching a temperature sensor to the inner or outer surface of the pipe wall 211 of the air extraction pipe 21 and measuring the temperature.

[0042] The supply amount of the exhaust gas may be automatically adjusted based on the detection result of the accumulation amount of the dust D by the dust measurement unit 37 (temperature sensor or pressure sensor). In this case, the control unit 10 may collect the measurement results by the dust measurement unit 37, determine the supply amount of the exhaust gas based on the measurement result, and transmit a control signal based on the result to the damper 34. The dust measurement unit 37 does not need to accurately grasp the accumulation amount of the dust D. That is, the measurement accuracy of the accumulation amount of the dust by the dust measurement unit 37 may be, for example, an accuracy that allows the supply amount of the exhaust gas to be adjusted based on the accumulation amount of the dust. Also, the operator may manually adjust the supply amount of the exhaust gas based on the measurement result by the dust measurement unit 37. The dust measurement unit 37 is not limited to a temperature sensor. For example, a device capable of measuring the accumulation state of the dust D in the extraction pipe 21 using ultrasonic waves (echoes), X-rays, etc., or a device capable of measuring a value that changes depending on the accumulation state of the dust D, such as a pressure sensor, may be used as the dust measurement unit 37.

[0043] The configurations of the air bleed pipe 21 and the exhaust gas supply unit 20 are not limited to the above example. With reference to FIG. 3, an air bleed pipe 21X according to a modified example and the supply of exhaust gas to the inside of the air bleed pipe 21X will be described. FIG. 3(a) is a cross-sectional view that shows a schematic bottom surface of the air bleed pipe 21X, and FIG. 3(b) is a diagram showing an example of the exhaust gas supply direction. FIG. 3(b) is a cut-out view of a part of the air bleed pipe 21X, and shows a schematic view of only the space inside the air bleed pipe 21 (inside the pipe wall 211). The flow of the bleed gas in the air bleed pipe 21 is indicated by an arrow F1, and the flow of the exhaust gas is indicated by an arrow F2.

[0044] 3(b), the air bleed pipe 21X according to the modified example is a quadrangular tubular pipe having a cross section (a cross section perpendicular to the extending direction of the air bleed pipe 21X) of a flow passage that is rectangular, for example. A bottom surface 213 of the air bleed pipe 21X is a flat surface.

[0045] In this case, the dust D may accumulate on the bottom surface 213, which is a flat surface. In this case, an opening 214 for supplying exhaust gas may be provided on the bottom surface 213 in order to remove the dust D. In this case, by introducing the exhaust gas F2 from the opening 214 provided on the bottom surface 213, it is possible to suppress accumulation of the dust D on the bottom surface 213 or to move the accumulated dust D.

[0046] The opening 214 may be elongated like the shape shown in FIG. 2, but is not limited to this shape. However, in order to move the dust D over a wider range, the opening 214 may be shaped to extend in a direction perpendicular to the flow direction of the bleed gas F1 (extension direction of the flow path) like the opening 212 shown in FIG. 2 and the opening 214 shown in FIG. 3, and the direction in which the exhaust gas F2 is supplied may be inclined along the flow direction of the bleed gas F1, not perpendicular to the bottom surface 213. In this case, the exhaust gas is supplied along the bottom surface 213 of the bleed pipe 21X. With this configuration, the exhaust gas can scatter and remove the dust D over a wider range. When the angle between the bottom surface 213 of the bleed pipe 21X and the direction in which the exhaust gas is supplied into the pipe is, for example, 45° or less, the exhaust gas can scatter the dust D over a wider range.

[0047] FIG. 3 illustrates a case where the bottom surface 213 is a flat surface, but the flat surface may constitute an inner surface other than the bottom surface of the air bleed pipe. For example, the side surface or top surface of the air bleed pipe may be formed by a flat surface, and dust D may accumulate on the surface. In such a case, an exhaust gas supply unit may be provided so that exhaust gas is supplied along the flat surface. Furthermore, depending on the internal shape of the air bleed pipe, dust D may also accumulate on the side surface that is not flat. In such a case, the configuration of the exhaust gas supply unit may be appropriately added or changed depending on the position where dust D is expected to accumulate.

[0048] Returning to FIG. 1, the classifier 22 separates the coarse particles of the raw dust by introducing a mixed gas of the bleed gas and the exhaust gas and classifying it. The classifier 22 may be, for example, a cyclone. In the classifier 22, by classifying the mixed gas in the above-mentioned temperature range, the coarse particles of the raw dust can be separated from the mixed gas while the chlorine content is contained in the gas phase. This prevents the volatilized chlorine content from precipitating alone or precipitating on the surface of the raw dust, causing coating and blocking the classifier 22. It also prevents the raw dust from precipitating chlorine from returning to the cement kiln side through the circulation flow path.

[0049] The exhaust gas from the combustion furnace 32 may also be mixed in the classifier 22. In this case, the ratio of the exhaust gas in the mixed gas is increased in the classifier 22. In this case, the flow path 33 from the combustion furnace 32 may be branched to supply the exhaust gas to both the extraction pipe 21 and the classifier 22, or the exhaust gas from different combustion furnaces may be introduced into the extraction pipe 21 and the classifier 22 individually.

[0050] From the viewpoint of suppressing the precipitation of chlorine in the coarse powder of raw material dust separated from the mixed gas in the classifier 22, the temperature of the bleed gas when separating the coarse powder of raw material dust in the classifier 22 is set to 770°C or higher. The temperature of the mixed gas introduced into the classifier 22 can be preferably 820°C or higher, more preferably 860°C or higher. The temperature of the outlet gas discharged from the classifier 22 is also set to 770°C or higher. In addition, the temperature of the outlet gas can be preferably 820°C or higher, more preferably 860°C or higher.

[0051] The particle size of the coarse powder of the raw material dust may be, for example, 18 μm or more, preferably 16 μm or more, and more preferably 14 μm or more. By classifying the raw material dust so that the coarse powder has a size of 14 μm or more, the volatile content can be sufficiently reduced.

[0052] The coarse powder of the raw material dust separated from the mixed gas in the classifier section 22 is used as a raw material for cement clinker, and so the coarse powder of the raw material dust flows through the circulation flow path 27 and is introduced into the bottom end 52 of the cement kiln 50. By returning the coarse powder of the raw material dust extracted from the extraction port 21A to the bottom end 52 in this manner, the coarse powder of the raw material dust can be used for producing cement clinker. The coarse powder of the raw material dust may be returned to the rising duct 42, the calciner 44, the chute connecting the cyclone C4 and the bottom end 52, or the kiln main body 56, instead of to the bottom end 52. Also, a plurality of circulation flow paths 27 may be provided to return the coarse powder of the raw material dust to a plurality of locations.

[0053] The discharge gas discharged from the classifier 22 contains coarse and fine powder of the raw material dust that was not recovered in the classifier 22. The Ca content contained in the raw material dust that was not recovered in the classifier 22 may react with chlorine content such as HCl in the exhaust gas to generate solid CaCl2. Such chlorine content can also be recovered as clinker dust in the chlorine bypass facility 90. This reduces the load on the scrubbing device that treats the exhaust gas from the combustion furnace 32 that contains chlorine. When the entire amount of the exhaust gas from the combustion furnace 32 that contains chlorine is introduced into the extraction pipe 21, the exhaust gas scrubbing device can be omitted.

[0054] The output gas containing fine raw material dust particles and gaseous chlorine, obtained by separating the coarse raw material dust particles from the mixed gas in the classifier 22, flows through a flow path 24 connected to the classifier 22 and is cooled in a cooling gas inlet 80. In the cooling gas inlet 80, a cooling gas flow path 81 is connected to the flow path 24 formed by a circular pipe 26, and the output gas containing the fine raw material dust particles and chlorine is mixed with the cooling gas and cooled. After cooling, the gas containing the output gas flows through the flow path 24 and is introduced into the cooling section 70.

[0055] The cooling gas may be air at room temperature, or may include exhaust gas of 200°C or less, preferably 100°C or less, generated in a factory or the like. Examples of exhaust gas include odorous gases generated during the reception, storage and fermentation of water-containing sludge such as sewage sludge brought into a cement manufacturing plant, and exhaust gases discharged from the suction section 74 (see FIG. 1) described below and from the suction sections of other processes. One of these may be used alone, or two or more may be used in combination. As an example, FIG. 1 shows a configuration in which room temperature air (outside air) is introduced into the above-mentioned cooling gas flow path 81.

[0056] The outlet gas is mixed with the cooling gas and cooled in the cooling gas introduction section 80. The temperature of the gas containing the outlet gas after cooling (mixed gas of the outlet gas and the cooling gas) may be 600°C or less, or may be 500°C or less, from the viewpoint of the heat resistance of the equipment.

[0057] In the cooling gas inlet 80, the cooling gas is introduced so as to follow the circumferential direction of the inner wall surface of the flow passage 24 through which the discharge gas containing fine powder of raw material dust and chlorine flows. This generates a swirling flow in the flow passage 24, which can prevent the adhesion of clinker dust to the inner wall surface of the flow passage 24 and the occurrence of coating. Such a swirling flow forms an air curtain on the outer periphery of the flow passage 24, which can protect the inner wall surface of the circular pipe 26 constituting the flow passage 24 from the high-temperature discharge gas.

[0058] FIG. 4 is a cross-sectional view showing a radial cross section of the outlet gas flow path 24 to which the cooling gas introduction part is connected. The flow path 24, through which the outlet gas containing chlorine and fine powder of the raw material dust flows after the coarse powder of the raw material dust is separated, is composed of a circular pipe 26. When viewed in a radial cross section of the flow path 24 (circular pipe 26) as shown in FIG. 4, the flow path wall 28 forming the flow path 81 of the cooling gas introduction part 80 is connected to the circular pipe 26 so as to extend in a direction parallel to the tangential direction of the circular pipe 26. The cooling gas introduction part 80 connected to the circular pipe 26 introduces the cooling gas G flowing in the flow path 81 into the flow path 24. The introduced cooling gas G forms a swirling flow SF while merging with the outlet gas in the flow path 24. The swirling axis of the swirling flow SF coincides with the central axis P of the flow path 24 formed by the circular pipe 26.

[0059] The outlet gas flows through the center of the flow passage 24 along the axial direction of the central axis P, and the cooling gas G flows as a swirling flow SF along the inner wall surface 26W of the circular pipe 26 that constitutes the flow passage 24. In this manner, the gases are caused to flow through different flow passages in the flow passage 24 for the outlet gas and the cooling gas G. A small amount of clinker dust is generated at the boundary between the flow passage of the outlet gas and the flow passage of the cooling gas G, but the swirling flow SF acts as an air curtain, which can prevent the clinker dust from adhering to the inner wall surface 26W and causing coating.

[0060] Furthermore, the chlorine bypass facility 90 includes a cooling section 70 downstream of the cooling gas introduction section 80 for cooling the gas containing the outlet gas, a recovery section 72 for recovering dust (clinker dust) contained in the gas containing the outlet gas from the gas containing the outlet gas, and a suction section 74 for sucking the outlet gas. The suction section 74 may suck not only the bleed gas from the bleed port 21A but also the exhaust gas from the opening 212. The cooling section 70 may be a water-cooled or air-cooled heat exchanger. The suction section 74 may be a normal suction fan such as a sirocco fan or a turbo fan.

[0061] The cooling section 70 cools the gas containing the outlet gas obtained by joining the cooling gas G and the outlet gas, for example, to less than 260°C, preferably less than 200°C. Since this gas containing the outlet gas contains clinker dust, it is introduced into the recovery section 72. The recovery section 72 may be a bag filter or a wet dust collector such as a wet scrubber. The clinker dust recovered in the recovery section 72 may be washed with water and then blended into a cement composition or used as a cement raw material.

[0062] 1 includes a chlorine bypass facility 90, a preheating and calcining unit 40 that preheats and calcines the cement raw materials, a cement kiln 50 that burns the preheated and calcined cement raw materials to obtain cement clinker, and a clinker cooler 60 that cools the cement clinker obtained in the cement kiln 50. The preheating and calcining unit 40 has four cyclones C1, C2, C3, and C4 (preheaters) and a calciner 44.

[0063] The bottom end 52 of the cement kiln 50 and the calciner 44 of the preheating calcination section 40 are connected by a rising duct 42. Near the connection between the rising duct 42 and the bottom end 52, an extraction port 21A of a chlorine bypass equipment 90 is provided, which extracts the kiln exhaust gas generated in the cement kiln 50 and recovers the dust contained in the kiln exhaust gas. An extraction pipe 21 is connected to the extraction port 21A. By providing the chlorine bypass equipment 90, the cement clinker production apparatus 100 can reduce the chlorine content in the cement clinker production apparatus 100.

[0064] The cement raw materials introduced from the connection between cyclone C1 and cyclone C2 flow through cyclone C1, cyclone C2, cyclone C3, rising duct 42, calciner 44, and cyclone C4, and are introduced into the kiln end 52 of the cement kiln 50. In the cement kiln 50, the preheated and calcined cement raw materials are heated by combustion in a burner 54 provided on the opposite side of the kiln end 52, and become cement clinker. The obtained cement clinker is cooled in a clinker cooler 60. After being cooled in the clinker cooler 60, cement clinker is obtained.

[0065] As described above, the control unit 10 may have the function of grasping the dust accumulation condition (accumulation amount) in the air extraction pipe 21 based on the measurement results by the dust measuring unit 37, and based on this, controlling the amount of exhaust gas supplied by the exhaust gas supply unit 20 into the air extraction pipe 21.

[0066] The control unit 10 may control each part of the above-mentioned cement clinker manufacturing apparatus 100, not limited to the exhaust gas supply unit 20. The control unit 10 may control the cement clinker manufacturing apparatus 100 based on information measured by a measurement unit provided in each part of the cement clinker manufacturing apparatus 100. Examples of operation information measured by the measurement unit include temperature, pressure, gas components, gas flow rate, dust concentration, and images. Taking the chlorine bypass equipment as an example, specific examples include the temperature inside or on the surface of the extraction pipe 21, the classification unit 22, and the flow path 24, the temperature of the kiln exhaust gas at the rising duct 42 and the kiln end 52, the temperature of the kiln exhaust gas flowing into the extraction pipe 21 from the extraction port 21A, the pressure of the kiln exhaust gas and the extraction gas, the gas components of the kiln exhaust gas and the extraction gas, the dust concentration contained in the kiln exhaust gas and the extraction gas, and images of the inside of the extraction pipe 21 and the classification unit 22. Examples of the measuring unit include a temperature sensor, a pressure sensor, a gas component sensor, a flow rate sensor, and a camera.

[0067] The control unit 10 may output a control signal for controlling each unit based on the operating information measured by the above-mentioned measuring unit. The control unit may be a normal computer system, and may include, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and an input / output interface.

[0068] The control unit 10 may also have a function of automatically controlling the flow rate of the exhaust gas from the combustion furnace. For example, the temperature of the exhaust gas discharged from the classifier 22 may be measured by a measuring unit, and the flow rate of the exhaust gas introduced into the extraction pipe 21 may be controlled to increase based on the measurement result. This makes it possible to prevent the temperature of the classifier 22 from dropping too much.

[0069] The cement clinker production apparatus 100 is equipped with the chlorine bypass equipment 90, and therefore can operate stably and produce cement clinker stably. In addition, the yield of cement clinker can be increased by effectively utilizing raw material dust. In addition, the amount of clinker dust is reduced, and the cost of treating the clinker dust can be reduced.

[0070] [Manufacturing method of cement clinker] The method for producing cement clinker according to one embodiment can be performed using a cement clinker production apparatus 100. These methods may include a preheating and calcining step of preheating and calcining the cement raw materials in the preheating and calcining section 40, a firing step (feeding step) of introducing the preheated and calcined cement raw materials from the kiln bottom 52 into the kiln body 56 to produce cement clinker, an extraction step of extracting the kiln exhaust gas generated in the firing step to obtain an extraction gas, a classification step of introducing the extraction gas through the extraction pipe 21 insulated by an insulating member and separating coarse powder of the raw material dust from the extraction gas in the classification section 22, an exhaust gas supply step of supplying high-temperature exhaust gas into the inside of the extraction pipe 21, a cooling gas introduction step of introducing a cooling gas so as to generate a swirling flow in a flow path through which the outlet gas, which is derived from the classification section 22 and has reduced coarse powder of the raw material dust, flows, a cooling step of cooling a gas containing the outlet gas, and a dust recovery step of recovering clinker dust contained in the gas containing the outlet gas cooled in the cooling step. The thermal energy of the cement raw materials and / or cement calcination may include chlorine-containing waste. Therefore, the burning process can be said to be an input process of inputting cement raw materials and / or thermal energy for cement burning into the cement kiln. The process may also include a circulation process of returning the coarse powder of the raw material dust separated in the classification process to the cement kiln 50. The process may also include a clinker cooling process of cooling the cement clinker obtained in the burning process in a clinker cooler 60.

[0071] In the preheating and calcining process, the cement raw material is introduced from a flow path between cyclones C1 and C2. The cement raw material is preheated by flowing through cyclones C1, C2, and C3. It is then introduced into a calciner 44 and calcined. The calciner 44 may be provided with a burner for supplying a thermal energy source such as coal and a burner for feeding waste plastic. The cement raw material calcined in the calciner 44 (calcined raw material) is introduced into cyclone C4 and heated.

[0072] In the firing process (feeding process), the calcined raw material heated in the cyclone C4 is introduced into the kiln bottom 52. Thereafter, the raw material is fired in the kiln body 56 to become cement clinker.

[0073] In the extraction process, the kiln exhaust gas generated in the firing process is extracted from the extraction port 21A. In the classification process, the extracted gas is introduced through the extraction pipe 21 insulated by a heat insulating member and classified. The coarse powder of the raw dust can be separated while the chlorine content is contained in the extracted gas as a gas phase. This prevents the volatilized chlorine content from precipitating alone or on the surface of the raw dust, causing coating and clogging the classifier 22. In addition, it prevents the raw dust from which chlorine has precipitated from being returned to the cement kiln side through the circulation flow path.

[0074] In the exhaust gas supply process, accumulated dust is removed by supplying high-temperature exhaust gas into the inside of the air extraction pipe 21. By scattering the dust D that may accumulate inside the air extraction pipe 21 by the exhaust gas, the possibility of blockage occurring inside the pipe can be reduced.

[0075] In the circulation process, the coarse powder classified in the classifying section 22 is returned to the kiln end 52 of the cement kiln 50, thereby efficiently increasing the production amount of cement clinker. In addition, in the cooling gas introduction process, a cooling gas is mixed with the outlet gas discharged from the classifying section 22 to cool the outlet gas.

[0076] Also, a swirling flow may be generated by introducing a cooling gas along the circumferential direction of the inner wall surface of the flow path 24 for the gas containing the outlet gas, which is constituted by the circular pipe 26. This makes it possible to prevent the adhesion of clinker dust to the flow path 24 and the occurrence of coating. The temperature of the gas containing the outlet gas cooled by mixing the cooling gas G in the cooling gas introduction step may be 600°C or less, or may be 500°C or less, from the viewpoint of the heat resistance of the equipment. By cooling the outlet gas in this way, the volatilized chlorine component precipitates alone or on the surface of the raw material dust to form clinker dust.

[0077] In the cooling step, the gas containing the outlet gas is cooled, for example, to less than 260°C, preferably less than 200°C, in a cooling section 70 equipped with a heat exchanger. In the dust recovery step, dust contained in the gas containing the cooled outlet gas is recovered in a recovery section 72. The dust recovered in this manner is called clinker dust. This manufacturing method allows the chlorine bypass facility 90 and the cement clinker manufacturing apparatus 100 to be stably operated. In addition, the raw material dust can be effectively utilized to efficiently manufacture cement clinker. In addition, the amount of clinker dust is reduced by separating the coarse powder of the raw material dust in the classification step, and the cost of treating the clinker dust can be reduced.

[0078] [Bypass facility operation method] The operating method of the chlorine bypass facility according to one embodiment may include the above-mentioned gas extraction process, classification process, exhaust gas supply process, mixing process, cooling process, and dust recovery process. It may also include the above-mentioned circulation process, or may further include any of the processes in the above-mentioned cement clinker manufacturing method. This operating method can be performed using the chlorine bypass facility 90 provided in the cement clinker manufacturing apparatus 100. Therefore, the content of each process may be the same as that in the above-mentioned cement clinker manufacturing method.

[0079] [Waste disposal method] The above-mentioned method for producing cement clinker can also be called a method for treating chlorine-containing waste. That is, the method for treating chlorine-containing waste according to one embodiment is a method for treating chlorine-containing waste in the above-mentioned cement clinker production apparatus 100, and may include the above-mentioned feeding step, air extraction step, classification step, and exhaust gas supply step. It may further include a cooling step and a dust recovery step. It may also include the above-mentioned circulation step, or may further include any of the steps of the above-mentioned method for producing cement clinker. Examples of chlorine-containing waste include incineration ash used as a cement raw material and waste plastics used as thermal energy for cement burning.

[0080] [Effect] According to the above example, in the chlorine bypass equipment 90, high-temperature exhaust gas is supplied by the exhaust gas supply unit 20 to the inside of the extraction pipe 21 insulated by the heat insulating member. This removes the dust D in the extraction pipe 21. Therefore, the occurrence of clogging of the extraction pipe 21 due to the accumulation of dust is suppressed.

[0081] Conventionally, it has been considered to classify the bleed gas under the condition that the extraction gas of 770°C or more is discharged. In this case, since it is required to move the bleed gas bled at the bleed port 21A to the classification section 22 while keeping the temperature high, the bleed pipe 21 needs to have a heat-insulating structure. However, when a heat-insulating structure is adopted, a structure in which a large amount of cooling air is introduced into the bleed pipe to blow away dust, as in the conventional chlorine bypass equipment, cannot be adopted because it lowers the temperature of the bleed gas. Therefore, there is a possibility that the inside of the bleed pipe 21 will be clogged by dust D. In contrast, in the above-mentioned configuration, high-temperature exhaust gas is supplied to the inside of the bleed pipe 21 to remove the accumulated dust. Therefore, the occurrence of clogging of the bleed pipe 21 due to the accumulation of dust is suppressed. In addition, since high-temperature exhaust gas is used, the temperature drop inside the bleed pipe 21 is suppressed. Therefore, the temperature drop of the bleed gas flowing inside is also suppressed.

[0082] The exhaust gas supply unit 20 may supply the exhaust gas so that the exhaust gas flows along the inner wall of the air extraction pipe 21. By supplying the exhaust gas so that the exhaust gas flows along the inner wall of the air extraction pipe 21 as described above, it becomes possible to remove accumulated dust over a wide range. Therefore, clogging of the air extraction pipe 21 due to accumulation of dust is suppressed.

[0083] An opening 212 is provided as a discharge port for the exhaust gas supplied from the exhaust gas supply unit 20 into the inside of the extraction pipe 21. The opening 212 may be long and extend in a direction intersecting the extension direction of the flow path of the extracted gas. With the above-mentioned configuration, it becomes possible to supply the exhaust gas to a wider range inside the extraction pipe 21, and dust can be removed more efficiently.

[0084] The exhaust gas may be a gas obtained by burning a pyrolysis gas generated by thermally treating plastics. By adopting the above-mentioned configuration, it becomes possible to recover chlorine contained in the pyrolysis gas generated by thermally treating plastics as clinker dust.

[0085] The exhaust gas may be gas extracted from a second extraction port different from the extraction port 21A in the cement kiln 50 to which the extraction port 21A is connected. The exhaust gas may be gas extracted from a cement kiln different from the cement kiln 50. With this configuration, dust in the extraction pipe 21 can be removed by using gas generated from existing equipment.

[0086] Also, the exhaust gas supply unit 20 may further include a dust measuring unit 37 that measures the amount of dust accumulated inside the air extraction pipe 21, and the exhaust gas supply unit 20 may adjust the supply amount of exhaust gas based on the amount of dust accumulated measured by the dust measuring unit 37. In this case, the supply amount of exhaust gas can be adjusted according to the amount of dust accumulated, so that the possibility that the inside of the air extraction pipe is clogged due to dust accumulation can be reduced. Therefore, stable operation of the chlorine bypass facility 90 can be realized.

[0087] In the above example, the cement clinker production apparatus 100 has any one of the above-mentioned chlorine bypass facilities 90. Since the above-mentioned cement clinker production apparatus 100 includes the above-mentioned chlorine bypass facility 90, the occurrence of clogging of the air extraction pipe 21 due to the accumulation of dust is suppressed.

[0088] Moreover, the above-mentioned method for producing cement clinker produces cement clinker using the above-mentioned cement clinker production apparatus 100. Since the above-mentioned method for producing cement clinker produces cement clinker using the above-mentioned chlorine bypass facility 90, the occurrence of blockage of the air extraction pipe due to accumulation of dust is suppressed.

[0089] The operating method of the chlorine bypass equipment 90 includes an extraction step of extracting the kiln exhaust gas generated when cement raw materials are burned in a cement kiln to obtain an extraction gas, a classification step of introducing the extraction gas through an extraction pipe insulated by a heat insulating member, separating coarse powder of raw material dust from the extraction gas, and obtaining an output gas having a temperature of 770°C or higher containing fine powder of the raw material dust, and an exhaust gas supply step of supplying high-temperature exhaust gas into the inside of the extraction pipe. According to this operating method of the chlorine bypass equipment, dust in the extraction pipe is removed by supplying high-temperature exhaust gas into the inside of the extraction pipe insulated by a heat insulating member. Therefore, the occurrence of blockage of the extraction pipe due to dust accumulation is suppressed.

[0090] The above-mentioned chlorine-containing waste treatment method is a method for treating waste by the cement clinker manufacturing apparatus 100, and includes a step of feeding the chlorine-containing waste into the cement kiln as a cement raw material and / or thermal energy for cement burning, a step of extracting kiln exhaust gas from the bottom of the cement kiln, the rising duct, or between them, a step of introducing the extracted gas obtained in the extraction step through an extraction pipe insulated by a heat insulating member, separating coarse powder of raw material dust from the extracted gas, and obtaining an output gas having a temperature of 770°C or higher containing fine powder of raw material dust, and a step of supplying high-temperature exhaust gas into the extraction pipe. According to this chlorine-containing waste treatment method, dust in the extraction pipe is removed by supplying high-temperature exhaust gas into the extraction pipe insulated by a heat insulating member. Therefore, the occurrence of blockage of the extraction pipe due to dust accumulation is suppressed. Furthermore, by treating chlorine-containing waste with the above-mentioned cement clinker manufacturing apparatus 100, it is possible to stably operate the chlorine bypass facility, and chlorine can be efficiently treated in large quantities.

[0091] [Variations] The disclosure in this specification should be considered to be illustrative and not restrictive in all respects. Various omissions, substitutions, modifications, etc. may be made to the above examples without departing from the scope of the claims and the gist thereof.

[0092] In the above embodiment, the air extraction port 21A is provided in the rising duct 42, but is not limited thereto. For example, the air extraction port 21A may be provided in the kiln end 52, or may be provided between the kiln end 52 and the rising duct 42 (or at the boundary).

[0093] Furthermore, when the joining position of the exhaust gas and the bleed gas is provided at a place other than the bleed pipe 21, the place is not particularly limited. Furthermore, the flow path of the exhaust gas may be branched so that the exhaust gas is divided into a plurality of places and joined with the bleed gas or the mixed gas. In this case, the flow rate of the exhaust gas joining at the plurality of joining points may be individually adjustable.

[0094] The above-mentioned description of the chlorine bypass facility 90 and the cement clinker production apparatus 100 also applies to the above-mentioned description of the cement clinker production method and the operation method of the chlorine bypass facility. The above-mentioned description of the production method and the operation method also applies to the above-mentioned description of the chlorine bypass facility 90 and the cement clinker production apparatus 100.

[0095] Although several embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-mentioned embodiments. For example, in the above-mentioned embodiment, the coarse powder of the raw material dust separated in the classifier 22 is returned to the cement kiln 50 side through the circulation passage 27, but the present disclosure is not limited to this. For example, it may be put in a tank of cement raw material and supplied to the preheating calcination section 40 as a cement raw material. In addition, the circular pipe 26 constituting the outlet gas passage 24 may be arranged inclined with respect to the horizontal direction instead of being arranged horizontally. The chlorine bypass equipment may have a mixing chamber between the cooling gas introduction section 80 and the cooling section 70. [Explanation of symbols]

[0096] 10...control section, 20...exhaust gas supply section, 21, 21X...extraction pipe, 21A...extraction port, 22...classification section, 24...flow path, 26...circular pipe, 27...circulation flow path, 30...waste plastic desalination equipment, 32...combustion furnace, 33...flow path, 34...damper, 35...desalting furnace, 37...dust measurement section, 40...preheating calcination section, 42...rising duct, 44...calcination furnace, 50...cement kiln, 52...kiln bottom, 70...cooling section, 72...recovery section, 74...suction section, 80...cooling gas introduction section, 81...flow path, 90...chlorine bypass equipment, 100...cement clinker manufacturing equipment, F1...extraction gas, F2...exhaust gas.

Claims

1. an exhaust port for extracting kiln exhaust gas from the bottom of the cement kiln, a rising duct, or a space between them; a classification section for separating coarse particles of the raw material dust from the bleed gas bled from the bleed port to obtain an output gas having a temperature of 770° C. or more and containing fine particles of the raw material dust; an air extraction pipe that connects the air extraction port and the classifier and is insulated by a heat insulating member; an exhaust gas supply unit that supplies high-temperature exhaust gas to the inside of the exhaust pipe; A chlorine bypass facility having:

2. The chlorine bypass facility according to claim 1, wherein the exhaust gas supply unit comprises an opening that communicates the inside and outside of the air extraction pipe, and a flow path that is connected to the opening and supplies the exhaust gas to the air extraction pipe.

3. 2. The chlorine bypass facility according to claim 1, wherein a discharge port into the inside of the extraction pipe for the exhaust gas supplied from the exhaust gas supply unit has an elongated shape extending in a direction intersecting an extension direction of a flow path of the extraction gas.

4. The cement kiln has the extraction port connected to the extraction pipe, and another extraction port through which the exhaust gas is extracted, which is different from the extraction port. The chlorine bypass facility according to any one of claims 1 to 3.

5. The apparatus further includes a dust measuring unit for measuring an amount of dust accumulated inside the air extraction pipe, The chlorine bypass facility according to any one of claims 1 to 4, wherein the exhaust gas supply unit is provided with a damper in a flow path of the exhaust gas that adjusts the amount of the exhaust gas supplied to the inside of the exhaust pipe based on the amount of dust accumulation measured by the dust measuring unit.

6. A cement clinker production apparatus comprising the chlorine bypass facility according to any one of claims 1 to 5.

7. A method for producing cement clinker, comprising the steps of: producing cement clinker by using the cement clinker production apparatus according to claim 6;

8. an extraction process for obtaining kiln exhaust gas from the bottom of the cement kiln, a rising duct, or a space between them; an exhaust gas supplying step of supplying high-temperature exhaust gas into an inside of an exhaust pipe insulated by an insulating member through which the bleed gas obtained in the exhaust step flows; a classification step of introducing a mixed gas obtained by joining the bleed gas and the exhaust gas in the bleed pipe into a classification section, separating coarse particles of the raw material dust from the bleed gas, and obtaining an output gas having a temperature of 770° C. or more and containing fine particles of the raw material dust; A method for operating a chlorine bypass facility, comprising:

9. 1. A method for treating chlorine-containing waste in a cement clinker plant, comprising: A step of feeding the chlorine-containing waste into a cement kiln as a cement raw material and / or thermal energy for cement burning; an extraction step of obtaining kiln exhaust gas from the bottom of the cement kiln, a rising duct, or a space between them; an exhaust gas supplying step of supplying high-temperature exhaust gas into an inside of an exhaust pipe insulated by an insulating member through which the bleed gas obtained in the exhaust step flows; a classification step of introducing a mixed gas obtained by joining the bleed gas and the exhaust gas in the bleed pipe into a classification section, separating coarse particles of the raw material dust from the bleed gas, and obtaining an output gas having a temperature of 770° C. or more and containing fine particles of the raw material dust; A method for treating chlorine-containing waste, comprising:

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