Method for producing cement clinker and cement clinker production system

Abstract

To provide a cement clinker production system capable of stably producing cement clinker even when the amount of meat-and-bone meal and sludge to be processed is increased.SOLUTION: A cement clinker production system 200 comprises (a) a storage tank 10 for storing a first cement raw material containing meat-and-bone meal and sludge, at least one of which is a major component of the first cement raw material and (b) a cement clinker firing apparatus 100 for firing the first cement raw material and a second cement raw material that contains meat-and-bone meal and sludge in amounts lower than those in the first cement raw material to produce cement clinker. The cement clinker production system 200 is equipped with (i) a detection device 20 for detecting at least one of the following: color of the first cement raw material, odor, and gas components generated from the first cement raw material, and (ii) a regulator 40 for adjusting the operating conditions of the cement clinker firing system 100 based on the results detected by the detection device 20.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a method for manufacturing cement clinker and a cement clinker manufacturing system.

Background Art

[0002] In a cement clinker manufacturing system, various wastes are used as raw materials in addition to incineration ash, coal ash, limestone, iron sources, slag, etc. The types of wastes processed in a cement clinker manufacturing system are extremely wide-ranging, and examples include waste plastics, sludge, and food processing residues. Since such wastes have different properties depending on the type, the following considerations have been made.

[0003] Patent Document 1 proposes a method for manufacturing cement clinker having a mixing step of mixing meat and bone meal and organic sludge. According to this manufacturing method, by the adhesion of meat and bone meal to organic sludge, the amount of oil content of meat and bone meal adhering to the inner wall of the pipe is reduced, and blockage of the pipe can be suppressed. Patent Document 2 proposes a technique for stabilizing the calorific value by kneading at least one first powder selected from the group consisting of toner, wheat flour, polymer powder, plastic powder, sawdust, and metal powder, at least one second powder of plastic powder and wood powder, and sludge.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] In a cement clinker firing device, it is expected that the amount of waste to be processed will increase more and more in the future. When the amount of waste to be processed increases, there is concern that changes in the properties of the waste will become factors in the operation fluctuations of the cement clinker firing device and the property fluctuations of the cement clinker.

[0006] For example, although meat and bone meal, which is a type of waste, has a relatively high calorific value, the content of chemical components such as CaO, SiO2, Al2O3, and Fe2O3 tends to be low. On the other hand, sludge, which is a type of waste, may contain a large amount of chemical components such as CaO or Al2O3, but generally has a low calorific value. Therefore, when the blending ratio of various wastes changes, the calorific value and composition of the cement raw material will fluctuate greatly. Such fluctuations in the calorific value and composition of the cement raw material are feared to affect the operating state of the cement clinker firing device and the properties of the cement clinker. Therefore, the present disclosure provides a method for manufacturing a cement clinker and a cement clinker manufacturing system capable of stably manufacturing a cement clinker even when the processing amounts of meat and bone meal and sludge are increased.

Means for Solving the Problems

[0007] The present disclosure provides a method for manufacturing a cement clinker using a first cement raw material containing meat and bone meal and sludge and having at least one of them as a main component, and a second cement raw material having a lower total content of meat and bone meal and sludge than the first cement raw material, the method comprising a detection step of detecting at least one selected from the color, odor, and gas components generated from the first cement raw material, and an adjustment step of adjusting the operating conditions of the cement clinker firing device based on the detection result in the detection step.

[0008] In the above method for manufacturing cement clinker, there is a detection step of detecting at least one selected from the color, odor, and gas components generated from the first cement raw material containing meat and bone meal and sludge, whose calorific value and composition are significantly different from each other. The color of the meat and bone meal is reddish-brown, while the sludge is gray or black. Thus, the colors of the two are significantly different from each other. Also, the odors of the meat and bone meal and the sludge are significantly different from each other, which is due to the difference in the gas components generated from each. Thus, paying attention to the fact that the appearance, odor, and generated gas components are significantly different between the meat and bone meal and the sludge, the detection target in the detection step is at least one selected from the color, odor, and gas components of the first cement raw material. Thereby, a detection result accurately reflecting the blending ratio of the meat and bone meal and the sludge can be obtained. Based on such a detection result, by having an adjustment step of adjusting the operating conditions of the cement clinker firing device, even if the throughput of the meat and bone meal and the sludge is increased, the cement clinker can be stably manufactured.

[0009] The above method for manufacturing cement clinker preferably has a raw material receiving step of receiving meat and bone meal and sludge at different timings in a tank for storing the first cement raw material to obtain the first cement raw material. Since both the meat and bone meal and the sludge have strong odors of different types, it is necessary to take odor countermeasures such as a sealing device for the receiving equipment. According to the manufacturing method having the raw material receiving step, by sharing the receiving equipment for the meat and bone meal and the sludge, the equipment cost and the operating cost can be reduced. In the above manufacturing method, there is an adjustment step of adjusting the operating conditions of the cement clinker firing device based on a detection result accurately reflecting the blending ratio of the meat and bone meal and the sludge. Therefore, even if the blending ratio of the meat and bone meal and the sludge changes significantly by having the raw material receiving step, by adjusting the operating conditions of the cement clinker firing device accordingly, the meat and bone meal and the sludge can be stably processed and the cement clinker can be stably manufactured.

[0010] In the above detection step, it is preferable to obtain a detection result using at least one selected from a semiconductor sensor, a crystal oscillator sensor, an infrared absorption sensor, and a color sensor. By this, when the blending ratio of meat and bone meal and sludge changes in the first cement raw material, it becomes possible to quickly detect the change and adjust the operation of the cement clinker firing apparatus, and it is possible to sufficiently suppress fluctuations in the properties of the cement clinker.

[0011] In the above adjustment step, it is preferable to adjust the supply amount to at least one cement clinker firing apparatus selected from the first cement raw material, the second cement raw material, and the fuel. By this, based on the detection result in the detection step, it is possible to quickly adjust the operation state of the cement clinker firing apparatus.

[0012] The present disclosure provides a manufacturing system for cement clinker including a storage tank for storing a first cement raw material containing meat and bone meal and sludge, and having at least one of these as a main component, the first cement raw material, and a second cement raw material having a lower total content of meat and bone meal and sludge than the first cement raw material, and a cement clinker firing apparatus for firing to obtain cement clinker, the manufacturing system for cement clinker comprising a detection device for detecting at least one selected from the color, odor, and gas components generated from the first cement raw material of the first cement raw material, and an adjustment device for adjusting the operating conditions of the cement clinker firing apparatus based on the detection result in the detection device.

[0013] In the above cement clinker manufacturing system, a detection device is provided for detecting at least one selected from the color, odor, and gas components generated from the first cement raw material containing meat and bone meal and sludge, which have different calorific values and compositions. The color of the meat and bone meal is reddish-brown, while the sludge is gray or black. Thus, the colors of the two are significantly different from each other. Also, the odors of the meat and bone meal and the sludge are significantly different from each other, which is due to the difference in the gas components generated from each. Thus, focusing on the fact that the appearance, odor, and generated gas components of the meat and bone meal and the sludge are significantly different, the detection target in the detection device is at least one selected from the color, odor, and gas components of the first cement raw material. As a result, the detection device can obtain a detection result that accurately reflects the mixing ratio of the meat and bone meal and the sludge. The above cement clinker manufacturing system is provided with an adjustment device for adjusting the operating conditions of the cement clinker firing device based on the above detection device and its detection result. Therefore, even if the treatment amounts of the meat and bone meal and the sludge are increased, the cement clinker can be stably manufactured.

[0014] It is preferable that the above detection device has at least one selected from a semiconductor sensor, a crystal oscillator sensor, an infrared absorption sensor, and a color sensor. As a result, when the mixing ratio of the meat and bone meal and the sludge changes in the first cement raw material, it is possible to quickly detect the change and adjust the operation of the cement clinker firing device, and sufficiently suppress fluctuations in the properties of the cement clinker.

[0015] It is preferable that the above adjustment device has a supply amount adjustment unit for adjusting the supply amount of at least one selected from the first cement raw material, the second cement raw material, and the fuel to the cement clinker firing device. As a result, based on the detection result in the detection device, the operating state of the cement clinker firing device can be quickly adjusted.

[0016] The manufacturing system of the cement clinker preferably includes a control device that receives the detection result from a detection device and outputs a control signal corresponding to the detection result to an adjustment device. By providing such a control device, it is possible to automatically and promptly adjust the operating conditions of the cement clinker firing device based on the detection result of the detection device.

Advantages of the Invention

[0017] According to the present disclosure, it is possible to provide a method for manufacturing a cement clinker and a manufacturing system for a cement clinker that can stably manufacture cement clinker even when the processing amounts of meat and bone meal and sludge are increased.

Brief Description of the Drawings

[0018]

Figure 1

Embodiments for Carrying Out the Invention

[0019] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings as appropriate. However, the following embodiments are examples for explaining the present disclosure and are not intended to limit the present disclosure to the following content.

[0020] FIG. 1 is a diagram schematically showing an embodiment of a manufacturing system for cement clinker. The manufacturing system 200 for cement clinker includes a storage tank 10 for storing a first cement raw material containing meat and bone meal and sludge and having at least one of them as a main component, a cement clinker firing device 100 for firing the first cement raw material and a second cement raw material having a lower total content of meat and bone meal and sludge than the first cement raw material to obtain cement clinker, a detection device 20 for detecting at least one selected from the color, odor, and gas components generated from the first cement raw material of the first cement raw material, and an adjustment device 40 for adjusting the operating conditions of the cement clinker firing device 100 based on the detection result in the detection device 20.

[0021] In this specification, among the cement raw materials introduced into the cement clinker firing apparatus 100, the cement raw materials other than the first cement raw material are collectively referred to as the second cement raw material. From the viewpoint of sufficiently stabilizing the operating state of the cement clinker firing apparatus 100, the total content of meat and bone meal and sludge in the second cement raw material is preferably 20% by mass or less, more preferably 10% by mass or less, and still more preferably 5% by mass or less. From the same viewpoint, the second cement raw material may not contain meat and bone meal and sludge. The second cement raw material may be supplied from a plurality of locations. The second cement raw materials supplied from a plurality of locations may be the same raw material or may be different from each other.

[0022] The cement clinker firing apparatus 100 includes an inlet 101 into which a part of the second cement raw material is introduced, four cyclones C1, C2, C3, C4 (preheaters) for preheating the second cement raw material introduced from the inlet 101, a calcining furnace 130 into which the first cement raw material is introduced and which calcines the first cement raw material and the second cement raw material, a rotary kiln 140 for firing the preheated and calcined first cement raw material and second cement raw material to produce cement clinker, and a clinker cooler 150 for cooling the cement clinker produced in the rotary kiln 140 and discharging the cooled cement clinker.

[0023] The inlet 101 is provided at the connection portion between the cyclone C1 and the cyclone C2. The second cement raw material introduced from the inlet 101 may contain at least one selected from the group consisting of, for example, incineration ash, coal ash, limestone, iron source, slag, and waste. The second cement raw material introduced from the inlet 101 is heated while flowing through the cyclone C1, the cyclone C2, the cyclone C3, the riser duct 134, the calcining furnace 130, and the cyclone C4, and is introduced into the kiln end 142 of the rotary kiln 140.

[0024] The kiln end 142 of the rotary kiln 140 and the calciner 130 are connected by a rising duct 134. A probe 136 for extracting the kiln exhaust gas in the rising duct 134 is connected to the rising duct 134. Downstream of the probe 136, a chlorine bypass facility (not shown) having a cooler, a bag filter, etc. is installed, and dust contained in the extracted gas (kiln exhaust gas) extracted by the probe 136 is recovered. By having such a chlorine bypass facility, volatile components such as chlorine-based compounds and alkalis can be reduced from within the cement clinker firing apparatus 100. In a modified example, the probe 136 may be connected to the kiln end 142 or may be connected to the boundary portion between the rising duct 134 and the kiln end 142.

[0025] The temperature in the calciner 130 is, for example, 850 to 890 °C. The first cement raw material has at least one of meat and bone meal and sludge as a main component and is stored in the storage tank 10. This first cement raw material is introduced from the storage tank 10 into the calciner 130 via the transfer path 15, the detection device 20, and the transfer path 25. The "main component" in the first cement raw material refers to the most abundant component among the components contained in the first cement raw material. The total content of meat and bone meal and sludge in the first cement raw material is higher than the total content of meat and bone meal and sludge in the second cement raw material. The total content of meat and bone meal and sludge in the first cement raw material may be 70% by mass or more, and may be 85% by mass or more. In addition to meat and bone meal and sludge, the first cement raw material may contain, for example, solid matter derived from waste (RDF, RPF, etc.), plastic waste (SR, ASR, CFRP), woody waste, and municipal waste, or may contain only meat and bone meal and sludge.

[0026] Meat and bone meal can be obtained, for example, by crushing beef, internal organs, fat and bones, heating and pressing them, and then crushing the residue obtained after extracting the oil and fat. It usually has a reddish-brown color, and its calorific value is, for example, 16 - 18 MJ / kg. This calorific value tends to be higher than that of sludge. Therefore, while it is useful as an energy source, the content of chemical components (such as CaO, SiO2, Al2O3, Fe2O3, etc.) useful for the production of cement clinker contained in meat and bone meal tends to be lower than that of sludge. Also, it has a peculiar odor (animal odor), and the odor factors are considered to include ammonia, hydrogen sulfide, mercaptans such as methyl mercaptan, methyl sulfide, dimethyl disulfide, trimethylamine, and acetic acid in the gas components generated from meat and bone meal. However, the gas components do not necessarily contain all of these components, and they may contain other components.

[0027] It is preferable for sludge to contain organic sludge from the perspective of calorific value. Examples of organic sludge include sewage sludge, night soil-based sludge, industrial wastewater sludge, blue-green algae, bottom sediment, and food processing residues (excluding meat and bone meal). Sludge may contain water. The water content of sludge may be, for example, 10 - 40 mass%. In addition to nitrogen, phosphorus compounds such as phosphoric acid, and inorganic substances such as CaO and Al2O3, sludge may contain various organic substances such as carbohydrates, proteins, and lipids. Examples of the odor components of sewage include indole, skatole, methyl terpineol, dimethyl besosyl alcohol, and cresol.

[0028] In addition to the above, sludge may contain various components as odor components, but regardless of the type, it generally has an odor such as toilet odor, sewage odor, or cesspool odor, which is clearly different from the odor of meat and bone meal (animal odor). The reason why the odors of meat and bone meal and sludge are different from each other is due to the difference in the types or concentrations of the gas components generated from each of them.

[0029] The storage tank 10 for storing the first cement raw material receives, for example, meat and bone meal and sludge transported by a vehicle. Since sludge and meat and bone meal are usually transported by different vehicles, the storage tank 10 may receive meat and bone meal and sludge at different times. For odor countermeasures, when receiving meat and bone meal or sludge from the vehicle into the storage tank 10, the vehicle and the storage tank 10 may be housed in a sealed space such as a building. By receiving both sludge and meat and bone meal in the storage tank 10, the equipment cost and operation cost required for such odor countermeasures can be reduced. Note that the storage tank 10 may receive cement raw materials other than meat and bone meal and sludge.

[0030] The first cement raw material stored in the storage tank 10 is transported to the detection device 20 by a transport path 15 composed of, for example, a flight conveyor having a sealed structure. The transport path 15 may have a regulating section for regulating the flow rate of the first cement raw material, a hopper, and a feeder for quantitatively supplying the first cement raw material to the detection device 20.

[0031] In the detection device 20, the color, odor, or gas components generated from the first cement raw material are detected. Since sludge and meat and bone meal have different colors from each other, if the color is detected, the mixing ratio of sludge and meat and bone meal can be obtained with high accuracy. When detecting the color, the detection device 20 has a sensor capable of detecting the color. Examples of the sensor include a color sensor equipped with R (red), G (green), and B (blue) photodiodes. The color of the first cement raw material may be directly observed with the color sensor for detection, or an image of the first cement raw material may be taken with a camera or the like, and the color may be detected by performing image processing as necessary.

[0032] Since sludge and meat and bone meal have different odors, the blending ratio of sludge and meat and bone meal can be determined with high accuracy by detecting the odor. When detecting the odor, the detection device 20 has a sensor capable of detecting the odor. Examples of such sensors include semiconductor odor sensors that detect odor molecules, and quartz crystal microbalance odor sensors. In a semiconductor odor sensor, changes in the odor can be detected based on changes in the resistance value. In a quartz crystal microbalance odor sensor, changes in the odor can be detected based on changes in the resonance frequency.

[0033] Since the odor is caused by the types and concentrations of gas components, the blending ratio of sludge and meat and bone meal can also be determined with high accuracy by detecting the gas components. The type of gas component to be detected may be changed according to the odor or properties of the sludge and meat and bone meal received in the storage tank 10. When detecting the gas components, the detection device 20 has a sensor capable of detecting the gas components. From the viewpoint of enabling rapid and highly accurate detection, it is preferable to use those that utilize physical phenomena or those that utilize both physical phenomena and chemical reactions. Specifically, examples include catalytic combustion sensors, semiconductor sensors, quartz crystal microbalance sensors, thermal conductivity sensors, infrared absorption sensors, and ultraviolet absorption sensors.

[0034] The detection device 20 is not limited to detecting one of color, odor, and gas components. For example, it may be configured to detect two or all three selected from color, odor, and gas components by combining a plurality of sensors, or other detection means may be further combined. In this way, the detection accuracy can be improved. The detection device 20 may have a configuration capable of detecting the color, odor, or gas components of the first cement raw material, which is the object to be detected. For example, sensors for detecting color, odor, or gas components may be arranged around the first cement raw material flowing on the conveyor. Also, a peephole may be provided in the conveyance path with a sealed structure for conveying the first cement raw material, and the color may be detected from the peephole, or a sensor may be inserted into the conveyance path to detect color, odor, or gas components.

[0035] After at least one selected from color, odor, and gas components is detected by the detection device 20, the first cement raw material flows through a conveyance path 25 configured by, for example, a flight conveyor having a sealed structure and is introduced into a calciner 130 of a cement clinker firing device 100. The conveyance path 25 may have a regulating section, a hopper, a feeder, etc. for regulating the flow rate of the first cement raw material.

[0036] The detection result obtained by detecting at least one selected from color, odor, and gas components by the detection device 20 is used for adjusting the operating conditions of the cement clinker firing device 100. Specifically, the detection result is input to a control device 30. The control device 30 outputs a control signal for adjusting an adjustment device 40 that adjusts the operating conditions of the cement clinker firing device 100 based on a signal related to the detection result. The control device 30 may have, for example, an input / output interface for inputting and outputting signals, a CPU (Central Processing Unit), a storage section, etc. The storage section may store a function or table data for calculating a control signal for adjusting the adjustment device 40 in response to an input signal of the detection result of the detection device 20.

[0037] The cement clinker manufacturing system has four supply amount adjustment sections 41, 42, 43, and 44 as the adjustment device 40. The first supply amount adjustment section 41 adjusts the supply amount of the second cement raw material introduced into the calciner 130. Here, the second cement raw material whose supply amount is adjusted may include waste other than meat and bone meal and sludge. Such wastes include incineration ash such as burnt shells, dusts, biomass, plastic wastes (SR, ASR, CFRP), woody wastes, and municipal solid waste. The first supply amount adjustment section 41 adjusts the supply amount of the second cement raw material based on a control signal corresponding to the detection result output from the control device 30. Thereby, the operating conditions of the cement clinker firing device 100 are adjusted. The second cement raw material may contain solid matter (RDF, RPF, etc.) derived from waste.

[0038] The second supply amount adjusting unit 42 adjusts the supply amount of fuel introduced into the calciner 130. Examples of the fuel include heavy oil, coal such as pulverized coal, and petroleum coke. The second supply amount adjusting unit 42 adjusts the fuel supply amount to the burner provided downstream of the second supply amount adjusting unit 42 based on a control signal from the control device 30. Thereby, the operating conditions of the cement clinker firing apparatus 100 are adjusted.

[0039] For example, in the first cement raw material, when the ratio of sludge to meat and bone meal increases, the energy brought into the cement clinker firing apparatus 100 by the first cement raw material decreases. In this case, by increasing the supply amount of the second cement raw material from the first supply amount adjusting unit 41 and / or the supply amount of fuel from the second supply amount adjusting unit 42, the decreased energy can be compensated for, and a temperature drop in the calciner 130 and the rotary kiln 140 can be suppressed.

[0040] The third supply amount adjusting unit 43 adjusts the supply amount of the first cement raw material introduced into the calciner 130. For example, when the ratio of sludge to meat and bone meal in the first cement raw material exceeds the upper limit, by adjusting the supply amount of the first cement raw material, a temperature drop in the calciner 130 and the rotary kiln 140 can be avoided. By providing the third supply amount adjusting unit 43, the supply amounts of meat and bone meal and sludge can be sufficiently increased according to the operating conditions of the cement clinker firing apparatus 100. Thereby, meat and bone meal and sludge can be utilized to the maximum extent, and effective utilization of resources can be achieved.

[0041] The fourth supply amount adjusting unit 44 adjusts the supply amount of fuel to the burner 144 that heats the rotary kiln 140. Examples of the fuel include fossil fuels such as heavy oil, coal such as pulverized coal, and petroleum coke. For example, when the ratio of sludge to meat and bone meal in the first cement raw material exceeds the upper limit, by adjusting the supply amount of fuel by the fourth supply amount adjusting unit 44, a temperature drop in the calciner 130 and the rotary kiln 140 can be avoided.

[0042] The cement clinker manufacturing system 200 has four supply amount adjusting units 41, 42, 43, 44, but is not limited thereto. For example, it may have at least one of the four supply amount adjusting units 41, 42, 43, 44, and instead of or in addition to these, another supply amount adjusting unit may be provided. As such a supply amount adjusting unit, for example, a supply amount adjusting unit for adjusting the supply amount of the second cement raw material introduced from the inlet 101 may be provided. When there are a plurality of supply amount adjusting units, the control device 30 may select and adjust one supply amount adjusting unit based on a preset priority order. Then, when the supply amount adjusting unit with the highest priority reaches the upper limit or the lower limit and further adjustment is not possible, the adjustment may be performed with the supply amount adjusting unit set to the next priority order.

[0043] Due to being provided with the supply amount adjusting unit as described above, in the rotary kiln 140, the first cement raw material and the second cement raw material can be stably heated. In the rotary kiln 140, the preheated and calcined first cement raw material and second cement raw material are heated to, for example, 1300 to 1450 °C by the combustion of the burner 144 provided at one end of the rotary kiln 140 to become cement clinker. The cement clinker generated in the rotary kiln 140 may be cooled by the cooling air such as the dedusted exhaust gas and outside air led out from the chlorine bypass facility in the clinker cooler 150. After being cooled in the clinker cooler 150, the cement clinker is led out from the cement clinker firing device 100. The cement clinker obtained in this way has sufficiently stable quality.

[0044] The cement clinker manufacturing system 200 has a detection device 20 that detects at least one selected from the color, odor, and gas components of the first cement raw material. In the case of meat and bone meal and sludge contained in the first cement raw material, since the appearance, odor, and generated gas components are significantly different, the detection device 20 can obtain a detection result that accurately reflects the mixing ratio of meat and bone meal and sludge. The adjustment device 40 adjusts the operating conditions of the cement clinker firing device based on such highly accurate detection results. Therefore, even if the mixing ratio of meat and bone meal and sludge in the first cement raw material changes significantly, the operation of the cement clinker manufacturing system 200 can be stably continued. Accordingly, even if the treatment amounts of meat and bone meal and sludge are increased, cement clinker can be stably manufactured.

[0045] A method for manufacturing cement clinker according to an embodiment uses the cement clinker manufacturing system 200. That is, the manufacturing method of this embodiment is a method for manufacturing cement clinker using a first cement raw material and a second cement raw material, and includes a detection step of detecting at least one selected from the color, odor, and gas components generated from the first cement raw material by the detection device 20, and an adjustment step of adjusting the operating conditions of the cement clinker firing device by the adjustment device 40 based on the detection result in the detection step.

[0046] Each step can be performed based on the description content of the above-described cement clinker manufacturing system 200. Therefore, the description content of the cement clinker manufacturing system 200 is also applicable to the method for manufacturing cement clinker of this embodiment. For example, in the adjustment step, at least one of the supply amount adjustment units 41, 42, 43, 44 may be adjusted by a control signal output from the control device 30 to which the detection result is input, so as to adjust the supply amount to at least one of the first cement raw material, the second cement raw material, and the fuel to the cement clinker firing device 100.

[0047] The storage tank 10 may have a raw material receiving step of receiving meat and bone meal and sludge at different timings to obtain a first cement raw material. In this case, although a bias in composition will occur in the storage tank 10, based on the detection result of the detection step, by adjusting the operating conditions of the cement clinker firing apparatus 100 in the adjustment step, even if the processing amounts of the meat and bone meal and the sludge are increased, the cement clinker can be stably manufactured.

[0048] As described above, the embodiments of the present disclosure have been described. However, the present disclosure is not limited to the above embodiments at all. For example, the method for manufacturing a cement clinker may be performed using a cement clinker manufacturing system different from the cement clinker manufacturing system 200. It is not essential to supply the entire amount of the first cement raw material to the calciner. For example, a part or the entire amount of the first cement raw material may be supplied from the inlet 101 or another inlet. Another inlet may be provided, for example, in the preheater section. Further, the description content of the method for manufacturing a cement clinker is also applicable to the cement clinker manufacturing system 200 and its modified examples. Further, the cement clinker firing apparatus 100 in the cement clinker manufacturing system 200 of the above embodiment includes four cyclones, but is not limited thereto. That is, the number of cyclones may be three or less, or may be five or more.

Industrial Applicability

[0049] According to the present disclosure, it is possible to provide a method for manufacturing a cement clinker and a cement clinker manufacturing system capable of stably manufacturing a cement clinker even if the processing amounts of meat and bone meal and sludge are increased.

Explanation of Signs

[0050] 10…Storage tank, 15, 25…Conveyor path, 20…Detection device, 30…Control device, 40…Regulating device, 41…Supply amount regulating section (first supply amount regulating section), 42…Supply amount regulating section (second supply amount regulating section), 43…Supply amount regulating section (third supply amount regulating section), 44…Supply amount regulating section (fourth supply amount regulating section), 100…Cement clinker firing device, 101…Inlet, 130…Precalciner, 134…Rising duct, 136…Probe, 140…Rotary kiln, 142…Kiln end, 144…Burner, 150…Clinker cooler, 200…Manufacturing system, C1, C2, C3, C4…Cyclone.

Claims

1. A method for manufacturing cement clinker using a first cement raw material containing meat and bone meal and sludge, with at least one of them as a main component, and a second cement raw material having a lower total content of the meat and bone meal and the sludge than the first cement raw material, a detecting step of detecting at least one selected from the color, odor, and gas components generated from the first cement raw material of the first cement raw material, and an adjusting step of adjusting the operating conditions of the cement clinker firing apparatus based on the detection result in the detecting step, wherein in the adjusting step, the supply amount of at least one selected from the first cement raw material, the second cement raw material, and fuel to the cement clinker firing apparatus is adjusted. A method for manufacturing cement clinker.

2. The method for manufacturing cement clinker according to claim 1, further comprising a raw material receiving step of receiving the meat and bone meal and the sludge at different timings in a tank for storing the first cement raw material to obtain the first cement raw material.

3. The method for manufacturing cement clinker according to claim 1 or 2, wherein in the detecting step, the detection result is obtained by using at least one selected from a semiconductor sensor, a crystal oscillator sensor, an infrared absorption sensor, and a color sensor.

4. A storage tank for storing a first cement raw material containing meat and bone meal and sludge, with at least one of them as a main component, and a cement clinker manufacturing system including a cement clinker firing apparatus for firing the first cement raw material and a second cement raw material having a lower total content of the meat and bone meal and the sludge than the first cement raw material to obtain cement clinker, a detecting device for detecting at least one selected from the color, odor, and gas components generated from the first cement raw material of the first cement raw material, and an adjusting device for adjusting the operating conditions of the cement clinker firing apparatus based on the detection result in the detecting device, wherein the adjusting device has a supply amount adjusting unit for adjusting the supply amount of at least one selected from the first cement raw material, the second cement raw material, and fuel to the cement clinker firing apparatus. A cement clinker manufacturing system.

5. The cement clinker manufacturing system according to claim 4, wherein the detecting device has at least one selected from a semiconductor sensor, a crystal oscillator sensor, an infrared absorption sensor, and a color sensor.

6. A cement clinker manufacturing system according to claim 4 or 5, comprising a control device that receives the detection result from the detection device and outputs a control signal corresponding to the detection result to the adjustment device.

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