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 the extracted gas extracted through the extraction hole 21A, for acquiring a derivation gas having a temperature of 770°C or more and including fine powder of the raw material dust; an extraction steam pipe 21 which couples the extraction hole 21A and the classifying part 22, and is heat insulated by a heat insulation member; and an accumulated dust removal part for suppressing temperature reduction in the extraction steam pipe 21, and discharging a gas into the extraction steam pipe 21 for removing the accumulated dust.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 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 the extraction port and the classification unit and is insulated by a thermal insulation member, and an accumulated dust removal unit that removes accumulated dust by discharging gas into the extraction pipe while suppressing a temperature drop inside the extraction pipe.

[0007] In the above-mentioned chlorine bypass equipment, the dust in the extraction pipe is removed by discharging gas from the accumulated dust removal unit into the inside of the extraction pipe insulated by the insulating member. Therefore, the occurrence of blockage of the extraction pipe due to dust accumulation is suppressed.

[0008] The accumulated dust removal unit may be configured to intermittently inject high-pressure gas into the inside of the air bleed pipe. By intermittently injecting high-pressure gas into the inside of the air bleed pipe, accumulated dust can be removed while preventing a temperature drop in the air bleed pipe.

[0009] The accumulated dust removal unit may be configured to inject the high-pressure gas along an inner wall of the bleed pipe. By injecting the high-pressure gas along the inner wall of the bleed pipe as described above, adhesion of dust to the inner wall is effectively prevented. Therefore, clogging of the bleed pipe due to accumulation of dust is further suppressed.

[0010] The bleed gas flow passage of the bleed pipe may have a cross section perpendicular to the extending direction of the bleed pipe that is circular, and the deposited dust removal unit may inject the high-pressure gas along a circumferential direction of the inner wall of the bleed pipe. When the bleed gas flow passage has a cross section that is circular, the high-pressure gas is injected along the circumferential direction, thereby making it possible to effectively remove dust remaining on the inner wall of the flow passage.

[0011] The air bleed pipe may have a flat surface, and the accumulated dust removal unit may inject the high-pressure gas along the flat surface of the air bleed pipe. By injecting the high-pressure gas along the flat surface of the air bleed pipe, dust remaining around the flat surface of the air bleed pipe can be effectively removed.

[0012] The accumulated dust removal section may be configured such that the outlet for the high-pressure gas into the inside of the air bleed pipe is elongated or has a plurality of pinholes arranged in a predetermined direction. With the above configuration, it is possible to inject the high-pressure gas toward a wider range inside the air bleed pipe, and therefore it is possible to more efficiently remove dust.

[0013] The system may further include a dust measuring unit that measures an amount of dust accumulated inside the air extraction pipe, and the accumulated dust removal unit may adjust an operating condition of the accumulated dust removal unit based on the amount of dust accumulated measured by the dust measuring unit. In this case, it becomes possible to adjust the operating condition of the accumulated dust removal unit according to the amount of dust accumulated, and the accumulated dust can be efficiently removed.

[0014] A cement clinker production apparatus according to one 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 accumulation of dust is suppressed.

[0015] 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.

[0016] A method for operating a chlorine bypass system according to one embodiment of the present disclosure includes an extraction step of extracting kiln exhaust gas generated when cement raw materials are burned in a cement kiln to obtain an extracted gas, a classification step of introducing the extracted gas obtained in the extraction step through an extraction pipe insulated by an insulating member to separate coarse raw material dust particles from the extracted gas to obtain an output gas having a temperature of 770°C or higher containing fine raw material dust particles, and a dust removal step of removing accumulated dust by discharging gas into the extraction pipe while suppressing a temperature decrease inside the extraction pipe.

[0017] According to the above-mentioned method for operating the chlorine bypass system, the dust in the extraction pipe is removed by discharging gas from the accumulated dust removal unit into the inside of the extraction pipe insulated by the insulating member. Therefore, the occurrence of blockage of the extraction pipe due to the accumulation of dust is suppressed.

[0018] 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, the method including: 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 air 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 air 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 a dust removal step of removing accumulated dust by discharging gas into the extraction pipe while suppressing a temperature drop inside the extraction pipe.

[0019] According to the above-mentioned chlorine-containing waste treatment method, the dust in the extraction pipe is removed by discharging gas from the dust removal unit into the extraction pipe insulated by the heat insulating member. Therefore, the occurrence of blockage of the extraction pipe due to dust accumulation is suppressed. Furthermore, by treating the chlorine-containing waste with the above-mentioned cement clinker manufacturing apparatus, the chlorine bypass facility can be operated stably, and a large amount of chlorine can be efficiently treated. Effect of the Invention

[0020] 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]

[0021] [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) and 2(b) 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

[0022] 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.

[0023] [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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] The air bleed pipe 21 is provided with an accumulated dust removal unit that removes accumulated dust by ejecting gas into the air bleed pipe 21. In Fig. 1, a high-pressure gas injection unit 30 that intermittently introduces high-pressure gas into the air bleed pipe 21 is provided as an example of the accumulated dust removal unit. Furthermore, the air bleed pipe 21 is provided with a dust measurement unit 35 for measuring the amount of dust accumulated inside the air bleed pipe.

[0028] The bleed pipe 21 and the high-pressure gas injection unit 30 will be described with reference to Fig. 2. Fig. 2 is a diagram illustrating the configuration of the bleed pipe 21 and its periphery. Fig. 2(a) is a cross-sectional view showing a state in which the high-pressure gas injection unit 30 is attached to the bleed pipe 21, and Fig. 2(b) is a perspective view showing a schematic view of the inside of the bleed pipe 21. Fig. 2(b) is a cut-out view of the vicinity of the high-pressure gas injection unit 30 as part of the bleed pipe 21, and shows 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 arrow F1, and the flow of the high-pressure gas is indicated by arrow F2.

[0029] As shown in FIG. 2(a), 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. Furthermore, another thermal insulation material or a heat retention device such as a heater may be disposed so as to surround the periphery of the air bleed pipe 21.

[0030] Further, the air bleed pipe 21 is provided with an opening 212 that communicates between the inside and outside of the pipe. As shown in FIG. 2(b), the opening 212 is provided so as to penetrate the pipe wall 211 (and the insulating member if one is provided around the pipe). This opening 212 can function as a discharge port when discharging high-pressure gas into the inside of the air bleed pipe 21. The opening 212 can be, for example, elongated as shown in FIG. 2(b). When the opening 212 is elongated, the longitudinal extension direction thereof is not particularly limited, but the opening 212 may be formed so as to extend along the extension direction of the air bleed pipe 21 as shown in FIG. 2(b).

[0031] The high-pressure gas injection unit 30 injects high-pressure gas from the opening 212 into the air bleed pipe 21. For example, an air injection device combining an air blaster and a compressor can be used as the high-pressure gas injection unit 30. In FIG. 2(a), an air blaster 31 is illustrated as an example of the high-pressure gas injection unit 30. When high-pressure gas is injected from the air blaster 31 with the tip of the air blaster 31 inserted into the opening 212, the high-pressure gas is discharged from the opening 212 into the air bleed pipe 21.

[0032] Since the opening 212 is formed so as to penetrate the pipe wall 211 as described above, the discharge port 31a of the air blaster 31 constituting the high-pressure gas jetting unit 30 may be inserted, for example, into the opening 212. However, from the viewpoint of not impeding the flow of the bleed gas F1, it is preferable that the discharge port 31a does not protrude from the pipe wall 211. When high-pressure gas is jetted from the air blaster 31 in this state, the high-pressure gas moves along the extension direction of the opening 212, and is jetted into the bleed pipe 21 as it is.

[0033] As an example, the high-pressure gas may be injected in a direction along the circumferential direction of the inner wall of the pipe wall 211 of the air extraction pipe 21 and downward in the flow path of the extracted gas F1, as shown in FIG. 2(a).

[0034] As shown in Fig. 2(b), the high-pressure gas F2 can move in a spiral shape along the inner wall inside the bleed pipe 21, which has a circular cross section, due to the influence of the bleed gas F1. If the injection direction of the high-pressure gas is adjusted so that it has a component along the traveling direction of the bleed gas F1, the spiral shape can be maintained further downstream, so that the dust D downstream can be scattered. In addition, if the opening 212 is made elongated (flat) as shown in Fig. 2, the high-pressure gas can be injected from the opening 212 over a wider range.

[0035] By jetting the high-pressure gas downward in the flow path, the dust D accumulated at the bottom of the bleed pipe 21 can be scattered. The inside of the bleed 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 bleed pipe 21 has low adhesion. Therefore, when the high-pressure gas is jetted, the dust D in the area where the high-pressure gas is jetted 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 bleed pipe 21 can be reduced.

[0036] The dust D may accumulate at the bottom of the bleed pipe 21. Therefore, when the high-pressure gas is injected in a direction along the bottom of the bleed pipe 21, the high-pressure gas does not move in a straight line but flows in a direction along the bottom, and therefore the amount of dust D affected by the airflow of the high-pressure gas is thought to increase. By adjusting the injection direction of the high-pressure gas so that the dust D that accumulates is present in an area through which the airflow of the high-pressure gas passes, the scattering of the dust D by the high-pressure gas can be promoted. Note that, as a method for controlling the injection direction of the high-pressure gas by the high-pressure gas injection unit 30, in addition to a method for adjusting the extension direction of the opening 212, for example, a method for adjusting the direction of the discharge port 31a of the air blaster 31 can also be used. The method for adjusting the injection direction can be appropriately changed depending on the configuration of the high-pressure gas injection unit 30.

[0037] The pressure of the high-pressure gas injected into the bleed pipe 21 by the high-pressure gas injection unit 30 may be adjusted to an extent that allows the dust D to scatter. The high-pressure gas may be supplied intermittently. As described above, the high-pressure gas may be injected to an extent that allows the dust D to scatter. From this viewpoint, for example, the injection time of the high-pressure gas may be set to about 0.1 to 1 second, and the high-pressure gas may be injected once, or may be repeated several times every few seconds to scatter the dust D. By shortening the injection time of the high-pressure gas and further reducing the number of injections, it is possible to suppress a decrease in temperature inside the bleed pipe 21 due to the injection of the high-pressure gas.

[0038] The high-pressure gas injection unit 30 may be installed at a plurality of locations in the bleed pipe 21. The injection of the high-pressure gas may be performed for the purpose of scattering the dust D. Therefore, the opening 212 is formed in a location where the dust D is expected to easily accumulate, and the high-pressure gas injection unit 30 is configured to be capable of injecting the high-pressure gas. This can reduce the possibility of the inside of the pipe being clogged due to the accumulation of the dust D. Examples of locations where the dust D is likely to accumulate include locations in the bleed pipe 21 where the flow of the bleed gas F1 may change, such as the vicinity of the bleed port 21A, a portion where the flow path is bent (bending portion), and the vicinity of the classification unit 22. By providing the high-pressure gas injection unit 30 at such locations and injecting the high-pressure gas, the risk of the flow path being clogged by the dust D can be reduced.

[0039] Furthermore, the fact that the injection of high-pressure gas can be performed to scatter the dust D means, in other words, that the injection of high-pressure gas may be omitted when the dust D is not retained. Therefore, a configuration may be adopted in which the injection of high-pressure gas is performed according to the retention state of the dust D in the air extraction pipe 21. For example, during the period in which the bleed gas flows in the air extraction pipe 21, the injection of high-pressure gas may be performed periodically at predetermined intervals (for example, every minute to several hours).

[0040] Also, the dust accumulation amount may be detected using the dust measuring unit 35 (see FIG. 1), and high-pressure gas may be injected depending on the result. One method for detecting the dust accumulation amount is, for example, measuring 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 measuring unit 35 may be configured to detect the accumulation amount of dust D 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.

[0041] The high-pressure gas may be automatically injected based on the detection result of the accumulation amount of dust D by the dust measurement unit 35. In this case, the control unit 10 may collect the measurement results by the dust measurement unit 35, determine whether or not the injection of high-pressure gas is necessary, and if the injection of high-pressure gas is necessary, transmit a control signal to the high-pressure gas injection unit 30 to inject the high-pressure gas. The dust measurement unit 35 does not need to accurately grasp the accumulation amount of dust D. That is, the measurement accuracy of the accumulation amount of dust by the dust measurement unit 35 may be, for example, an accuracy that can determine whether or not the accumulation amount of dust is at a level that requires the injection of high-pressure gas. In addition, the operator may manually determine whether or not the injection of high-pressure gas is necessary using the detection result of the dust measurement unit 35. The dust measurement unit 35 is not limited to a temperature sensor. For example, a device capable of measuring the accumulation state of dust D in the extraction pipe 21 using ultrasound (echo), X-rays, or the like, or a device capable of measuring a value that changes depending on the accumulation state of dust D, such as a pressure sensor, may be used as the dust measurement unit 35.

[0042] The configurations of the bleed pipe 21 and the high-pressure gas injection unit 30 are not limited to the above example. With reference to Fig. 3, a modified example of the bleed pipe 21X and the injection of high-pressure gas by the high-pressure gas injection unit 30 into the inside of the bleed pipe 21X will be described. Fig. 3(a) is a cross-sectional view showing a schematic bottom surface of the bleed pipe 21X, and Fig. 3(b) is a diagram showing an example of the injection direction of the high-pressure gas. Fig. 3(b) is a cut-out view of a part of the bleed pipe 21X, 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 high-pressure gas is indicated by an arrow F2.

[0043] 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.

[0044] In the air extraction pipe 21X, the dust D may accumulate on the bottom surface 213, which is a flat surface. In this case, in order to remove the dust D, an opening 214 for injecting high-pressure gas may be provided in the bottom surface 213. In this case, the high-pressure gas F2 can be injected from the opening 214 provided in the bottom surface 213 so as to lift up the dust D.

[0045] The opening 214 may be elongated as shown in FIG. 2, or may be configured as a plurality of pinholes 214a (small openings) arranged in a predetermined direction as shown in FIG. 3(a) and FIG. 3(b). In the example shown in FIG. 3(a) and FIG. 3(b), four pinholes 214a are arranged in a direction perpendicular to the flow direction of the bleed gas F1 (extension direction of the flow path). The high-pressure gas F2 is injected into the inside from each of the pinholes 214a, but the injection direction may be inclined along the flow direction of the bleed gas F1 instead of perpendicular to the bottom surface 213. That is, the high-pressure gas may be injected along the bottom surface 213 of the bleed pipe 21X. In this case, the high-pressure gas can scatter and remove the dust D over a wider range. When the angle between the flow direction of the bleed gas F1 in the bleed pipe 21X and the injection direction of the high-pressure gas is set to, for example, 45° or less, the high-pressure gas can scatter the dust D over a wider range. In locations where there is a large accumulation of dust D, the angle between the flow direction of the bleed gas F1 in the bleed pipe 21X and the direction in which the high-pressure gas is injected is set to 45° to 90°, thereby enabling the dust D to be accurately removed from the locations where high-pressure injection is performed. Also, in order to prevent a large amount of dust D from flowing into the opening 214, which would make it impossible to perform high-pressure injection, it is preferable that the angle between the flow direction of the bleed gas F1 in the bleed pipe 21X and the direction in which the high-pressure gas is injected is 90° or less.

[0046] When multiple pinholes 214a are arranged in a row as shown in Fig. 3, the directions of high-pressure gas ejection from each pinhole may be parallel to each other as shown in Fig. 3. In this case, interference between the high-pressure gas ejected from each pinhole 214a can be suppressed, and dust D can be scattered over a wider range.

[0047] In FIG. 3, a case has been described in which 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 is formed by a flat surface, and dust D may accumulate on the surface. In such a case, a high-pressure gas injection unit may be provided to inject high-pressure gas 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 high-pressure gas injection 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 material dust by introducing the bleed gas and classifying it. The classifier 22 may be, for example, a cyclone. In the classifier 22, the bleed gas in the above-mentioned temperature range is classified, so that the coarse particles of the raw material dust can be separated from the bleed gas while the chlorine content is contained in the gas phase. This prevents the volatilized chlorine content from precipitating alone or from precipitating on the surface of the raw material dust, causing coating and clogging the classifier 22. It also prevents the raw material dust from which chlorine has precipitated from returning to the cement kiln side through the circulation flow path.

[0049] From the viewpoint of suppressing the precipitation of chlorine in the coarse powder of raw material dust separated from the bleed gas in the classification section 22, the temperature of the bleed gas when separating the coarse powder of raw material dust in the classification section 22 is set to 770°C or higher. The temperature of the bleed gas can be preferably 820°C or higher, more preferably 860°C or higher. The temperature of the outlet gas discharged from the classification section 22 is also set to 770°C or higher. The temperature of the outlet gas can be preferably 820°C or higher, more preferably 860°C or higher.

[0050] In addition, in the classification section 22, the exhaust gas from the combustion furnace may be mixed with the bleed gas. In this case, a mixed gas containing the bleed gas and the exhaust gas is obtained in the classification section 22. In addition, an example of a combustion furnace that generates an exhaust gas is a combustion furnace in a waste plastic desalination facility. The combustion furnace is a furnace that burns tar contained in a pyrolysis gas generated by heat treating a raw material containing waste plastic. When the exhaust gas from the combustion furnace is introduced into the classification section 22 and mixed with the bleed gas, the temperature of the gas mixed in the classification section 22 can be stably increased compared to the case of the bleed gas alone. In addition, when the exhaust gas from the combustion furnace and the bleed gas are merged, the flow rate of the gas mixed in the classification section 22 can be increased. Therefore, the classification performance in the classification section 22 is improved, and the coarse powder of the raw material dust can be separated from the mixed gas with higher accuracy.

[0051] The exhaust gas that merges with the bleed gas in the chlorine bypass facility 90 is not limited to the exhaust gas from the combustion furnace of the waste plastic desalination facility, but may be exhaust gas from a combustion furnace other than the combustion furnace of the waste plastic desalination facility. For example, the exhaust gas may be 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, which are provided in a biomass pellet carbonization facility. One of these exhaust gases may be used alone, or a combination of multiple exhaust gases may be used.

[0052] 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.

[0053] The coarse powder of the raw material dust separated from the bleed 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 bled from the bleed 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 chute connecting the cyclone C4 and the bottom end 52, the calciner 44, 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.

[0054] The output gas output from the classifier 22 contains coarse and fine powder of the raw material dust that was not recovered in the classifier 22. When exhaust gas is introduced into the classifier 22, the Ca content contained in the raw material dust that was not recovered in the classifier 22 may react with the 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.

[0055] The output gas containing fine raw material dust particles and gaseous chlorine, obtained by separating the coarse raw material dust particles from the bleed 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] Furthermore, the chlorine bypass facility 90 includes a cooling section 70 for cooling the gas containing the outlet gas downstream of the cooling gas introduction section 80, 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 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] As described above, the control unit 10 may have a function of grasping the dust accumulation state (accumulation amount) in the air bleed pipe 21 based on the measurement result by the dust measuring unit 35, and based on this, controlling the injection of high-pressure gas by the high-pressure gas injection unit 30 into the air bleed pipe 21. Examples of the control of the injection of high-pressure gas by the control unit 10 include adjusting the operation and stopping of the high-pressure gas injection unit 30, the injection time of the high-pressure gas, the injection amount of the high-pressure gas, etc.

[0067] The control unit 10 may control each part of the cement clinker manufacturing apparatus 100, not limited to the high-pressure gas injection unit 30. 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 the operation information measured by the measurement unit include temperature, pressure, gas components, gas flow rate, dust concentration, and images. Taking the chlorine bypass 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.

[0068] 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.

[0069] 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 that merges with the bleed gas may be controlled to increase according to the measurement result. This makes it possible to prevent the temperature of the classifier 22 from dropping too much.

[0070] 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.

[0071] [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 process in which the cement raw materials are preheated and calcined in the preheating and calcining section 40, a firing process (feeding process) in which the preheated and calcined cement raw materials are introduced from the kiln bottom 52 into the kiln body 56 to produce cement clinker, an extraction process in which the kiln exhaust gas generated in the firing process is extracted to obtain an extraction gas, a classification process in which the extraction gas is introduced through an extraction pipe 21 insulated by an insulating member and coarse powder of the raw material dust is separated from the extraction gas in a classification section 22, a deposited dust removal process in which deposited dust is removed by discharging gas into the extraction pipe 21, a cooling gas introduction process in which a cooling gas is introduced so as to generate a swirling flow in a flow path through which an outlet gas in which coarse powder of the raw material dust has been reduced and which is derived from the classification section 22, flows, a cooling process in which a gas containing the outlet gas is cooled, and a dust recovery process in which clinker dust contained in the gas containing the outlet gas cooled in the cooling process is recovered. The cement and / or the thermal energy of cement calcination may contain chlorine-containing waste. Therefore, the calcination process can also be called an input process of inputting the cement raw material and / or the thermal energy of cement calcination into the cement kiln. The calcination 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 calcination process may also include a clinker cooling process of cooling the cement clinker obtained in the calcination process in a clinker cooler 60.

[0072] 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 that burns a thermal energy source such as coal and a burner that inputs waste plastics. The cement raw material calcined in the calciner 44 (calcined raw material) is introduced into cyclone C4 and heated.

[0073] 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.

[0074] 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.

[0075] In the accumulated dust removal process, accumulated dust is removed by discharging gas into the inside of the air extraction pipe 21. By scattering dust D that may accumulate inside the air extraction pipe 21 with the gas, the possibility of blockage occurring inside the pipe can be reduced.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] [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, accumulated dust removal 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.

[0080] [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 accumulated dust removal 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 cement clinker production method. Examples of chlorine-containing waste include incineration ash used as a cement raw material and waste plastics used as thermal energy for cement burning.

[0081] [Effect] According to the above example, in the chlorine bypass equipment 90, gas is discharged by the high-pressure gas injection unit 30 functioning as an accumulated dust removal unit into the inside of the extraction pipe 21 insulated by the insulating member while suppressing a temperature drop inside the extraction pipe 21. This removes the dust D inside the extraction pipe 21. Therefore, the occurrence of blockage of the extraction pipe 21 due to the accumulation of dust is suppressed.

[0082] Conventionally, it has been considered to classify the bleed gas under the condition that the extraction gas of 770°C or more is discharged. At this time, 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, the dust accumulated inside the bleed pipe 21 is removed by discharging gas into the inside of the bleed pipe 21 while suppressing a temperature drop inside the bleed pipe 21. Therefore, the occurrence of blockage of the bleed pipe 21 due to the accumulation of dust is suppressed. In addition, the gas is discharged while suppressing a temperature drop inside the bleed pipe 21. Therefore, the temperature drop of the bleed gas flowing inside is also suppressed.

[0083] The accumulated dust removal unit may be configured to intermittently inject high-pressure gas into the inside of the air extraction pipe 21. By intermittently injecting high-pressure gas into the inside of the air extraction pipe 21, it is possible to remove dust D at least with the amount of gas supplied, so that it is possible to remove accumulated dust while preventing a decrease in the temperature inside the air extraction pipe 21.

[0084] The accumulated dust removal unit may inject high-pressure gas along the inner wall of the air bleed pipe 21. With such a configuration, dust is effectively prevented from adhering to the inner wall, and thus the occurrence of blockage of the air bleed pipe due to dust accumulation is further suppressed.

[0085] The bleed gas flow passage of the bleed gas in the bleed pipe 21 may have a circular cross section perpendicular to the extending direction of the bleed pipe 21. In this case, the deposited dust removal unit may inject high-pressure gas along the circumferential direction of the inner wall of the bleed pipe 21. When the flow passage has a circular cross section, the high-pressure gas is injected along the circumferential direction, whereby dust remaining on the inner wall of the bleed pipe can be effectively removed.

[0086] Like the air bleed pipe 21X, the bottom surface 213 of the bleed gas flow path of the air bleed pipe 21X may be flat, and the deposited dust removal unit may inject high-pressure gas along the bottom surface 213 of the air bleed pipe 21X. By injecting high-pressure gas along the flat bottom surface of the flow path, dust remaining on the bottom surface of the air bleed pipe 21X can be effectively removed.

[0087] Furthermore, the deposited dust removal section may have a long outlet for discharging the high-pressure gas into the air extraction pipe 21, or may be a plurality of pinholes arranged in a predetermined direction. With the above configuration, it becomes possible to inject the high-pressure gas over a wider range inside the air extraction pipe 21, and dust can be removed more efficiently.

[0088] Also, the apparatus may further include a dust measuring unit 35 that measures the amount of dust accumulated inside the air extraction pipe 21, and the accumulated dust removal unit may adjust the operating conditions of the accumulated dust removal unit based on the amount of dust accumulated measured by the dust measuring unit 35. In this case, it becomes possible to adjust the operating conditions of the accumulated dust removal unit according to the amount of dust accumulated, and the accumulated dust can be efficiently removed.

[0089] In the above example, the cement clinker production apparatus 100 has any one of the above chlorine bypass facilities 90. Since the above cement clinker production apparatus 100 includes the above chlorine bypass facility 90, the occurrence of clogging of the air extraction pipe 21 due to the accumulation of dust is suppressed.

[0090] 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.

[0091] The operating method of the chlorine bypass equipment 90 includes an extraction process of extracting the kiln exhaust gas generated when cement raw materials are burned in a cement kiln to obtain an extraction gas, a classification process 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 a dust accumulation removal process of removing accumulated dust by discharging 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 discharging 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.

[0092] The above-mentioned chlorine-containing waste treatment method is a method for treating chlorine-containing waste by the cement clinker manufacturing apparatus 100, and includes a step of feeding the chlorine-containing waste into a 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 extracting step through an extracting 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 removing accumulated dust by discharging gas into the inside of the extracting pipe. According to this chlorine-containing waste treatment method, dust in the extracting pipe is removed by discharging gas into the inside of the extracting pipe insulated by a heat insulating member. Therefore, the occurrence of blockage of the extracting pipe due to dust accumulation is suppressed. Furthermore, by treating chlorine-containing waste with the above-mentioned cement clinker production apparatus 100, the chlorine bypass facility can be operated stably, so that a large amount of chlorine can be treated efficiently.

[0093] [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.

[0094] 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).

[0095] Furthermore, when exhaust gas generated from a combustion furnace is used, the joining position with the bleed gas is not limited to the classifier 22. For example, the bleed gas and exhaust gas may join to become a mixed gas between the classifier 22 and the bleed port 21A, for example, in a flow path inside the bleed pipe 21. As another modified example, the flow path of the exhaust gas may be branched so that the exhaust gas is divided into a plurality of locations 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 sections may be individually adjustable.

[0096] In the above embodiment, the air bleed pipe 21 and the opening 212 shown in Fig. 2 and the air bleed pipe 21X and the opening 214 shown in Fig. 3 have been described. However, the present invention is not limited to these combinations. For example, instead of providing the air bleed pipe 21 with the long opening 212, the opening 214 consisting of a pinhole 214a may be provided. Also, the air bleed pipe 21 may be configured to be provided with both the opening 212 and the opening 214, and high-pressure gas may be supplied to the inside from both the openings 212, 214.

[0097] 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.

[0098] 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]

[0099] 10...control section, 21, 21X...air extraction pipe, 21A...air extraction port, 22...classification section, 24...flow path, 26...circular pipe, 27...circulation flow path, 30...high-pressure gas injection section, 31...air blaster, 35...dust measurement section, 40...preheating and calcining section, 42...rising duct, 44...calciner, 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 apparatus, F1...extracted gas, F2...high-pressure 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 bleed pipe that connects the air bleed port and the classifier, that is insulated by an insulating member, and that has a circular cross section of a flow path of the bleed gas perpendicular to an extending direction of the air bleed pipe; a high-pressure gas injection unit having a discharge port for discharging high-pressure gas into the inside of the bleed pipe, and configured to intermittently inject the high-pressure gas from the discharge port along a circumferential direction of an inner wall of the bleed pipe, and to remove dust accumulated inside the bleed pipe while suppressing a temperature decrease inside the bleed pipe; A chlorine bypass facility having:

2. An exhaust port for extracting kiln exhaust gas from the bottom of a 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 classifying unit, is insulated by a heat insulating member, and has an inner wall with a flat surface; a high-pressure gas injection unit having a discharge port for discharging high-pressure gas into the inside of the bleed pipe, the high-pressure gas being intermittently injected from the discharge port along the flat surface of the bleed pipe, and removing dust accumulated inside the bleed pipe while suppressing a temperature decrease inside the bleed pipe; A chlorine bypass facility having:

3. 3. The chlorine bypass facility according to claim 1, wherein the discharge port of the high-pressure gas injection section for discharging the high-pressure gas into the inside of the extraction pipe is elongated or is a plurality of pinholes arranged in a predetermined direction.

4. a dust measuring unit that measures an amount of dust accumulated inside the air extraction pipe; a control unit that controls whether or not to inject the high-pressure gas into the air extraction pipe by the high-pressure gas injection unit based on the amount of accumulated dust measured by the dust measurement unit; The chlorine bypass facility according to any one of claims 1 to 3, further comprising:

5. A cement clinker production apparatus having the chlorine bypass facility according to any one of claims 1 to 4.

6. A method for producing cement clinker, comprising the steps of: producing cement clinker by using the cement clinker production apparatus according to claim 5;

7. an extraction process for extracting kiln exhaust gas from an exhaust port of the cement kiln, a rising duct, or an extraction port between the kiln and the rising duct, thereby obtaining an extracted gas; an accumulated dust removal step of removing accumulated dust by discharging gas into the air bleed pipe while suppressing a decrease in temperature inside the air bleed pipe connected to the air bleed port; a classification step of introducing the dust together with the bleed gas through the bleed pipe insulated by a heat insulating member 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:

8. 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 extracting kiln exhaust gas from an exhaust port of the cement kiln, a rising duct, or a space between the exhaust duct and the kiln exhaust gas to obtain an extraction gas; an accumulated dust removal step of removing accumulated dust by discharging gas into the air bleed pipe while suppressing a decrease in temperature inside the air bleed pipe connected to the air bleed port; a classification step of introducing the dust together with the bleed gas through the bleed pipe insulated by a heat insulating member 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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