Vertical firing furnace, method for measuring height of raw material packed bed, and method for manufacturing fired products

Abstract

To provide: a vertical burning furnace capable of correctly measuring the amount of material packed into a material passage; a measurement method; and a burned product production method.SOLUTION: A vertical burning furnace comprises: an outer tube; an inner tube; and a material passage formed between the outer tube and the inner tube and burns material packed into the material passage, and comprises a level meter capable of continuously detecting a position of an upper end of a material packed bed formed by packing the material into the material passage.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a vertical firing furnace for firing raw materials such as limestone to produce fired products such as quicklime, a method for measuring the height of a packed bed of raw materials in the vertical firing furnace, and a method for producing fired products using the vertical firing furnace. [Background technology]

[0002] Conventionally, vertical kilns that burn raw materials such as limestone to produce burned products such as quicklime, such as Beckenbach kilns, have been known (Patent Document 1, etc.). In the vertical kiln, the amount of raw materials filled in the raw material passage of the vertical kiln is visually measured to check the timing of raw material replenishment and whether the firing is performed appropriately. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2010-501819 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in conventional vertical firing furnaces, the amount of raw material filled in the raw material passage is measured visually, making it impossible to perform accurate measurements. As a result, there are problems in that raw materials cannot be replenished at the appropriate time, and it is not possible to accurately determine whether the firing is being performed properly.

[0005] The present invention has been made in consideration of the above problems, and an object of the present invention is to provide a vertical firing furnace, a method for measuring the height of a raw material packed bed, and a method for manufacturing a fired product, which are capable of accurately measuring the amount of raw material packed in the raw material passage. [Means for solving the problem]

[0006] The vertical firing furnace according to the present invention has an outer cylinder, an inner cylinder, and a raw material passage formed between the outer cylinder and the inner cylinder, and is a vertical firing furnace for firing raw materials filled in the raw material passage, and is characterized by having a level meter that can continuously detect the position of the upper end of a raw material packed bed formed by filling the raw material passage with raw materials.

[0007] In addition, the height measuring method of the raw material packed bed according to the present invention is a method for measuring the height of a raw material packed bed in a vertical firing furnace, and is characterized in that it includes a measurement step of continuously detecting the position of the upper end of the raw material packed bed by a level meter.

[0008] Furthermore, the method for producing a fired product according to the present invention is characterized in that the fired product is produced using the vertical firing furnace. Effect of the Invention

[0009] According to the present invention, it is possible to provide a vertical firing furnace capable of accurately measuring the amount of raw material packed in a raw material passage, a method for measuring the height of a raw material packed bed, and a method for producing a fired product. [Brief description of the drawings]

[0010] [Figure 1] FIG. 2 is a schematic diagram showing a vertical firing furnace according to the present embodiment. [Diagram 2] 2 is a schematic diagram showing an upper connecting member and an upper combustion chamber according to the embodiment. FIG. [Diagram 3] 4 is a schematic diagram showing a lower connecting member and a lower combustion chamber according to the embodiment. FIG. [Figure 4] 1 is a schematic diagram showing a level meter according to an embodiment of the present invention; [Diagram 5] FIG. 2 is a block diagram showing a configuration of a control device according to the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Preferred embodiments for carrying out the present invention will be described below with reference to the drawings. Note that the following embodiments do not limit the inventions according to the claims, and not all of the combinations of features described in the embodiments are necessarily essential to the solution of the invention. In addition, in the present embodiments, the scale and dimensions of each component may be exaggerated, and some components may be omitted.

[0012] [Vertical firing furnace configuration] The vertical firing furnace 1 according to this embodiment is a vertical firing furnace that fires raw materials filled in a raw material passage 13 described later and discharges exhaust gas generated by the firing to the outside of the furnace. Specifically, as shown in Fig. 1, the vertical firing furnace 1 includes a furnace body 10, which is the main body of the furnace, a heat exchanger 20 that exchanges heat between the exhaust gas generated by the firing and the air outside the furnace, a blower 30 that supplies air to the heat exchanger 20, an injector 40 that supplies the air heated by the heat exchanger 20 to the furnace body 10, and an exhaust fan 50 that discharges the exhaust gas generated by the firing to the atmosphere. In this embodiment, the vertical firing furnace 1 is preferably a Beckenbach furnace.

[0013] As shown in Fig. 1, the furnace body 10 includes a long cylindrical outer cylinder 11 and a long cylindrical inner cylinder 12 disposed inside the outer cylinder 11, and is formed into a vertical cylindrical shape extending along the vertical direction as a whole. The inner cylinder 12 is formed to be longer than the outer cylinder 11 in the axial direction and is disposed coaxially with the outer cylinder 11, with the upper end of the inner cylinder 12 located above the outer cylinder 11. The inner diameter of the inner cylinder 12 is formed smaller than the inner diameter of the outer cylinder 11 so that a raw material passage 13 having a sufficient space for limestone to flow between the inner peripheral surface of the outer cylinder 11 and the outer peripheral surface of the inner cylinder 12 can be formed.

[0014] A plurality of (five in this embodiment) upper connecting members 14 and a plurality of (five in this embodiment) lower connecting members 15 are provided between the inner peripheral surface of the outer tube 11 and the outer peripheral surface of the inner tube 12 so as to bridge both surfaces, and the outer tube 11 and the inner tube 12 are connected by these upper connecting members 14 and lower connecting members 15. The upper connecting members 14 are installed above the lower connecting members 15.

[0015] The upper connecting members 14 are arranged radially at equal intervals along the circumferential direction of the furnace body 10, as shown in Fig. 2. The lower connecting members 15 are arranged radially at equal intervals along the circumferential direction of the furnace body 10, as shown in Fig. 3, so as not to overlap the upper connecting members 14 in the vertical direction.

[0016] Above the outer cylinder 11 and the inner cylinder 12, a furnace top 10a, which is the apex of the furnace body 10, is provided, and the furnace top 10a is formed in an approximately dome shape covering the upper ends of the outer cylinder 11 and the inner cylinder 12. At the top of the furnace top 10a, an inlet 10b is formed, which opens at a position overlapping with the extension line of the axis of the outer cylinder 11 and the inner cylinder 12, and a charging device (not shown) is provided that can charge raw materials including any raw material such as limestone and solid fuel from the inlet 10b. Inside the furnace top 10a, a conical upper lid 10c is installed, which is coaxial with the outer cylinder 11 and the inner cylinder 12 and has its apex located on the upper side. Then, the raw materials are charged (piled up) into the raw material passage 13 from the charging device through the inlet 10b, so that the raw materials are filled (piled up) in the raw material passage 13 so as to be approximately even in the circumferential direction, forming a raw material packed bed A.

[0017] An upper combustion chamber 16 and a lower combustion chamber 17 are provided below the upper connecting member 14 and the lower connecting member 15 on the outer circumferential surface of the outer cylinder 11, and these multiple upper combustion chambers 16 and lower combustion chambers 17 are radially arranged at equal intervals in the circumferential direction, similar to the upper connecting member 14 and the lower connecting member 15, as shown in Figure 4. In other words, the multiple upper combustion chambers 16 and lower combustion chambers 17 are radially arranged so as not to overlap each other in the vertical direction.

[0018] The upper combustion chamber 16 and the lower combustion chamber 17 are respectively equipped with an upper burner 16a and a lower burner 17a therein, and are configured so that the upper burner 16a and the lower burner 17a heat the inside of the raw material passage 13. In addition, an injector 40, which is connected to a heat exchanger 20, is connected to the lower combustion chamber 17.

[0019] The lower ends (bottom of the furnace body 10) of the outer cylinder 11 and the inner cylinder 12 are provided with a calcined product discharge port 18 capable of discharging the calcined product to the outside of the furnace body 10. As the calcined product discharge port 18, various known configurations can be adopted, such as a configuration in which a rotor (not shown) provided at the lower ends of the outer cylinder 11 and the inner cylinder 12 rotates to discharge an even amount of the calcined product in the circumferential direction to the outside of the furnace body 10. In this embodiment, the calcined product is a product produced by calcining the raw materials in the raw material packed bed A through countercurrent contact with the upward hot gas flowing through the raw material passage 13, and is, for example, quicklime.

[0020] The inner cylinder 12 is provided with an upper inlet 12a and a lower inlet 12b that can allow hot gas flowing through the raw material passage 13 to flow into the inner cylinder 12. A plurality of upper inlets 12a (five in this embodiment) are provided at equal intervals along the circumferential direction of the inner cylinder 12 near the upper part of the upper connecting member 14, and are configured to allow a portion of the upward hot gas to flow into the inner cylinder 12. The hot gas that flows into the inner cylinder 12 from the upper inlet 12a is sent to the heat exchanger 20 as exhaust gas that serves as a heat source. In addition, the upward hot gas that does not flow into the inner cylinder 12 from the upper inlet 12a is sent to the exhaust fan 50 from above the outer cylinder 11 as exhaust gas.

[0021] A plurality of lower inlets 12b (five in this embodiment) are provided at equal intervals along the circumferential direction of the inner cylinder 12 near the lower part of the lower combustion chamber 17, and are configured to allow the downward hot gas flowing through the raw material passage 13 and the air that has flowed into the raw material passage 13 from the sintered product outlet 18 to flow into the inner cylinder 12. The downward hot gas and air that have flowed into the inner cylinder 12 from the lower inlets 12b are supplied to the lower burner 17a of the lower combustion chamber 17, and the hot gas flows again through the raw material passage 13 in a state further heated by combustion in the lower burner 17a.

[0022] The heat exchanger 20 is connected to the upper part of the inner cylinder 12 via piping (not shown), and exchanges heat between the exhaust gas sent from the inner cylinder 12 and air supplied from a blower 30 provided below the heat exchanger 20. The air heated by the heat exchange is supplied to the injector 40, discharged from the injector 40 into the lower combustion chamber 17, further heated by the lower burner 17a, and guided into the raw material passage 13. The exhaust gas not supplied to the heat exchanger 20 is sent to an exhaust fan 50.

[0023] The exhaust fan 50 is connected to the outer casing 11 and the heat exchanger 20 via piping (not shown), and is configured to suck in exhaust gas from the outer casing 11 and the heat exchanger 20. The exhaust gas sucked in by the exhaust fan 50 is led to a dust removal device (not shown) such as a cyclone, where dust is collected, and then released into the atmosphere.

[0024] The vertical firing furnace 1 according to this embodiment has a level meter 60 capable of continuously detecting the position of the upper end of the raw material packed bed A formed by filling the raw material passage 13 with raw materials. The level meter 60 is disposed above the raw material passage 13 (furnace top 10a) and at a position parallel to the upper combustion chamber 16 in the radial direction, and is configured to continuously detect the position of the upper end of the raw material packed bed A by continuously measuring the distance from the level meter 60 to the upper end of the raw material packed bed A. Therefore, the manager who manages the vertical firing furnace can prevent visual measurement errors, and can accurately grasp the appropriate timing for refilling the raw materials and whether the firing is being performed properly. In addition, since the level meter 60 enables continuous measurement in the vertical firing furnace 1 according to this embodiment, the manager does not need to measure at regular intervals, which improves workability.

[0025] In this embodiment, the level meter 60 is configured to detect the position of the upper end of the raw material packed bed A by irradiating electromagnetic waves toward the raw material packed bed A located vertically downward, receiving reflected waves that are electromagnetic waves reflected at the upper end of the raw material packed bed A, and measuring the distance to the upper end of the raw material packed bed A. This can further improve the measurement accuracy.

[0026] In this embodiment, the level meter 60 is configured to continuously measure the distance from the level meter 60 to the upper end of the raw material packed bed A by irradiating the raw material packed bed A with electromagnetic waves at a predetermined interval. In this embodiment, the irradiation of the raw material packed bed A with electromagnetic waves may be performed at short intervals (e.g., every few seconds) or at long intervals (e.g., every few minutes or hours). The electromagnetic waves irradiated from the level meter 60 are preferably microwaves, but any electromagnetic waves such as radar waves may be used.

[0027] 4, a plurality of level gauges 60 (five in this embodiment) are provided radially at equal intervals in the circumferential direction within the furnace top 10a, and each of the plurality of level gauges 60 is configured to continuously measure the distance from the level gauge 60 to the upper end of the raw material packed bed A, thereby continuously detecting the position of the upper end of the raw material packed bed A. Since a plurality of level gauges 60 are provided in the circumferential direction of the furnace top 10a, it is possible to perform measurements over substantially the entire area of ​​the raw material passage 13, and it is also possible to grasp the difference in the settling speed of the raw material packed bed A in the circumferential direction of the raw material passage 13.

[0028] As shown in Figure 5, in this embodiment, the level gauge 60 is configured to be capable of data communication with a control device 70 provided outside the furnace body 10, and is configured to continuously transmit measurement data (the position of the upper end of the raw material packed bed A) measured by the level gauge 60 to the control device 70.

[0029] The internal configuration of the control device 70 will be described below with reference to Fig. 5. The control device 70 according to this embodiment is a device that includes at least an operation unit (not shown) and a display screen (not shown), and various known devices such as a personal computer or a tablet terminal can be adopted.

[0030] The control device 70 includes at least a control unit 71 that controls the entire control device 70, a memory unit 72 that stores various data, and a display unit 73 that displays the various data stored in the memory unit 72. The control unit 71 also includes a calculation unit 71a that calculates the rate at which the distance from the level meter 60 to the upper end of the raw material packed bed A changes, and a judgment unit 71b that judges the conditions for firing the raw materials, etc.

[0031] The storage unit 72 is configured to continuously store the measurement data measured by the level meter 60. That is, the storage unit 72 continuously stores the measurement data continuously transmitted from the level meter 60. The storage unit 72 is also configured to store the calculation result of the calculation unit 71a, the determination result of the determination unit 71b, and abnormality occurrence prediction information and abnormality occurrence information (described later) detected by the determination unit 71b.

[0032] The calculation unit 71a is configured to calculate the speed at which the distance from the level gauge 60 to the upper end of the raw material packed bed A changes, using the measurement data stored in the memory unit 72. In this embodiment, the calculation unit 71a calculates the speed at which the distance from the level gauge 60 to the upper end of the raw material packed bed A changes (settling velocity) for each of the multiple level gauges 60, and calculates an average settling velocity from the measurement data of the multiple level gauges 60. In addition, the calculation results of the calculation unit 71a are stored in the memory unit 72.

[0033] The judgment unit 71b is configured to judge the conditions for firing the raw materials using the calculation results of the calculation unit 71a. This not only allows accurate measurement by the level gauge 60, but also prevents abnormalities in the quality of the fired product. The judgment unit 71b is also configured to detect the possibility (sign) of abnormality in the raw material passage 13 using the judgment results, and to detect abnormalities in the raw material passage 13, such as the occurrence of agglutination on the furnace wall. This makes it possible to quickly respond to problems occurring in the raw material passage 13, and to easily identify the location of the abnormality. In this embodiment, the judgment unit 71b is configured to judge the firing conditions and detect abnormalities using the calculation results for each of the multiple level gauges 60 calculated by the calculation unit 71a and the average settling velocity calculated by the calculation unit 71a. The judgment results of the judgment unit 71b and abnormality occurrence sign information and abnormality occurrence information detected by the judgment unit 71b are stored in the memory unit 72.

[0034] The display unit 73 is configured to display the measurement data stored in the memory unit 72. Specifically, the display unit 73 is configured to display the measurement data stored in the memory unit 72 as numerical values ​​on the display screen. Therefore, the manager can check the amount of raw material filled in the raw material passage 13 in real time, and there is no need to perform measurements at predetermined time intervals, which improves the manager's workability.

[0035] The display unit 73 is configured to display the judgment result of the judgment unit 71b. Specifically, the display unit 73 is configured to display the judgment result of the judgment unit 71b stored in the memory unit 72 on the display screen in a distinguishable state, and can display the state of the baked product discharged from the baked product discharge port 18 several hours later by any display method such as displaying the settling speed as "fast", "appropriate" and "slow" and, based on these speeds, "unbaked", "appropriate" and "overbaked" as judgment indicators of the baking conditions.

[0036] Furthermore, the display unit 73 is configured to display, when the judgment unit 71b detects an abnormality in the raw material passage 13, that an abnormality has occurred in the raw material passage 13. Specifically, the display unit 73 is configured to display that there is a possibility (sign) of an abnormality occurring in the raw material passage 13, based on the abnormality occurrence sign information detected by the judgment unit 71b and stored in the memory unit 72. The display unit 73 is also configured to display on the display screen that an abnormality has occurred in the raw material passage 13, based on the abnormality occurrence information detected by the judgment unit 71b and stored in the memory unit 72, and is configured to display this in any display method, such as "abnormality."

[0037] [Manufacturing method of baked products] Next, a method for producing a fired product using the vertical firing furnace 1 according to this embodiment will be described. In the vertical firing furnace 1 configured as above, first, as shown in FIG. 1, raw materials fed from a feeding device (not shown) are filled (piled) into the raw material passage 13 to form a raw material packed bed A. In this state, the raw materials in the raw material packed bed A are fired by countercurrent contact with the upward hot gas generated by the upper burner 16a and the lower burner 17a and flowing through the raw material passage 13. The raw materials in the raw material packed bed A are then fired to a fired product, which is discharged from the fired product outlet 18 to the outside of the furnace body 10.

[0038] [Measurement method] Next, a method for measuring the distance to the upper end of the packed raw material layer A using the vertical firing furnace 1 according to this embodiment will be described.

[0039] [Measurement process] First, the position of the upper end of the raw material packed bed A is continuously detected by continuously measuring the distance to the upper end of the raw material packed bed A using a plurality of level gauges 60 provided at the top 10a of the furnace body 10. In this embodiment, as described above, the level gauges 60 irradiate electromagnetic waves toward the raw material packed bed A, receive the reflected waves, which are electromagnetic waves reflected at the upper end of the raw material packed bed A, and continuously measure the distance to the upper end of the raw material packed bed A.

[0040] [Storage process, calculation process, judgment process and display process] The measurement data measured by the plurality of level gauges 60 are continuously stored in the memory unit 72, and are displayed on the display screen by the display unit 73. When the measurement data is stored in the memory unit 72, the calculation unit 71a uses the measurement data stored in the memory unit 72 to calculate the speed at which the distance from the level gauges 60 to the upper end of the raw material packed bed A changes.

[0041] Specifically, the calculation unit 71a calculates the change in distance from the level gauge 60 to the upper end of the raw material packed bed A after a predetermined time has elapsed and the elapsed time based on the measurement data stored in the memory unit 72, and calculates the speed at which the distance from the level gauge 60 to the upper end of the raw material packed bed A changes (settling velocity) based on the change in distance and the elapsed time. In this embodiment, the calculation unit 71a calculates the settling velocity for each of the multiple level gauges 60, and calculates the average settling velocity from the measurement data of the multiple level gauges 60. The calculation results calculated by the calculation unit 71a are then stored in the memory unit 72.

[0042] In this embodiment, the "predetermined time" may be the time from when the level meter 60 takes a measurement until the next measurement, or the time from when the level meter 60 takes a measurement until the point at which it has taken multiple measurements, or it may be a predefined time (e.g., a few minutes or a few hours).

[0043] When the calculation result of the calculation unit 71a is stored in the memory unit 72, the judgment unit 71b judges the conditions for firing the raw materials using the calculation result of the calculation unit 71a stored in the memory unit 72. In this embodiment, the judgment unit 71b judges that firing is insufficient when the speed at which the distance from the level gauge 60 to the upper end of the raw material packed bed A changes (settling speed) stored in the memory unit 72 is faster than an appropriate value (reference value) of the settling speed calculated in advance from the production amount of the fired product (amount of raw materials input), judges that excessive firing is being performed when it is slower than the reference value, and judges that appropriate firing is being performed when it is the reference value. The judgment result by the judgment unit 71b is stored in the memory unit 72 and is displayed on the display screen by the display unit 73. In this embodiment, the above-mentioned reference value is stored in the memory unit 72 in advance.

[0044] In this embodiment, the judgment unit 71b judges the firing conditions using the calculation results for each of the multiple level gauges 60 calculated by the calculation unit 71a and the average settling velocity calculated by the calculation unit 71a. When the judgment unit 71b judges the firing conditions using the calculation results for each of the multiple level gauges 60 calculated by the calculation unit 71a, the firing conditions are judged based on the deviation of the settling velocity of each of the multiple level gauges 60 calculated by the calculation unit 71a and a reference value. Then, when the judgment unit 71b judges that firing is insufficient or excessive and there is a difference (deviation) in the settling velocity of the raw material packed bed A in the circumferential direction, the amount of fuel used to be supplied to the upper burner 16a and the lower burner 17a located near the raw material packed bed A where the difference in settling velocity occurs may be adjusted.

[0045] In addition, when the judgment unit 71b judges the baking conditions using the average settling velocity calculated by the calculation unit 71a, the judgment unit 71b judges the baking conditions based on the average settling velocity and a reference value. If it is judged that baking is insufficient or excessive, the discharge amount of the baked product discharged from the baked product discharge port 18 may be adjusted to be smaller or larger, and the residence time of the raw material in the raw material passage 13 may be adjusted.

[0046] In addition, the judgment unit 71b uses the judgment results to detect the possibility (sign) of an abnormality occurring in the raw material passage 13. In this embodiment, the judgment unit 71b judges the firing conditions using the calculation results for each of the multiple level gauges 60, and when it is judged that firing is insufficient or excessive, if the deviation of the settling speed of each of the multiple level gauges 60 calculated by the calculation unit 71a is equal to or greater than a first threshold value defined in advance, it judges that there is a possibility (sign) of an abnormality occurring in the raw material passage 13. The abnormality occurrence sign information detected by the judgment unit 71b is stored in the memory unit 72. In this embodiment, the first threshold value is a reference value for judging that the settling speed of the raw material packed bed A cannot be adjusted (the quality of the fired product cannot be adjusted) by the amount of fuel used supplied to the upper burner 16a and the lower burner 17a alone, and is stored in the memory unit 72 in advance.

[0047] When the judgment unit 71b detects a possibility (sign) of an abnormality occurring in the raw material passage 13, the display unit 73 displays the possibility (sign) of an abnormality occurring in the raw material passage 13 based on the abnormality occurrence sign information stored in the memory unit 72. Furthermore, based on the display, the production volume may be automatically or manually reduced (the amount of raw material input may be reduced) and the settling speed of the raw material packed bed A may be adjusted (the quality of the fired product may be adjusted).

[0048] In addition, the judgment unit 71b detects an abnormality in the raw material passage 13 using the above judgment result. In this embodiment, the judgment unit 71b judges the firing conditions using the calculation results for each of the multiple level gauges 60, and when it is judged that firing is insufficient or excessive, if the deviation of the settling speed of each of the multiple level gauges 60 calculated by the calculation unit 71a is equal to or greater than a second threshold value specified in advance, the amount of fuel used to supply to the upper burner 16a and the lower burner 17a and the amount of production (amount of raw material input) cannot be adjusted to adjust the settling speed of the raw material packed bed A (adjust the quality of the fired product), so the level gauge 60 that transmitted the measurement data on which the judgment was based is identified, and it is judged that an abnormality has occurred below the corresponding level gauge 60. The abnormality occurrence information detected by the judgment unit 71b is stored in the memory unit 72.

[0049] In this embodiment, the second threshold value is a reference value for determining that the settling velocity of the raw material packed bed A (adjustment of the quality of the fired product) cannot be adjusted by simply reducing the production volume (reducing the amount of raw material input), and is stored in advance in the storage unit 72. The absolute value of the second threshold value is greater than the absolute value of the first threshold value.

[0050] When the judgment unit 71b detects an abnormality in the raw material passage 13, the display unit 73 displays on the display screen using an arbitrary display method that an abnormality has occurred in the raw material passage 13, based on the abnormality occurrence information stored in the memory unit 72.

[0051] [Variations] The vertical firing furnace according to the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the technical concept of the present invention.

[0052] For example, in the above-described embodiment, the level meter 60 is described as being configured to irradiate electromagnetic waves toward the raw material packed bed A, receive reflected waves that are electromagnetic waves reflected at the upper end of the raw material packed bed A, and continuously measure the distance to the upper end of the raw material packed bed A, but this is not limited to this, and the level meter 60 may be configured to measure the distance to the upper end of the raw material packed bed A using a method other than electromagnetic waves.

[0053] Furthermore, in the above-described embodiment, the vertical firing furnace 1 is described as having the calculation unit 71a and the judgment unit 71b, but this is not limited thereto, and the vertical firing furnace 1 may be configured not to have the calculation unit 71a and the judgment unit 71b.

[0054] In the above-described embodiment, the judgment unit 71b is configured to judge the conditions for firing the raw materials and to use the judgment results to detect abnormalities within the raw material passage 13. However, this is not limited to this, and for example, a configuration in which an abnormality detection unit that detects abnormalities within the raw material passage 13 is provided separately from the judgment unit 71b may be used.

[0055] Furthermore, in the above-described embodiment, the level gauge 60 is described as being provided in multiple locations in the circumferential direction of the furnace top 10a, but this is not limited to this, and for example, the configuration may include one level gauge 60 provided at the furnace top 10a.

[0056] In the above-described embodiment, the vertical firing furnace 1 is configured to display the judgment result of the judgment unit 71b on the display unit 73, and when the judgment unit 71b detects an abnormality in the raw material passage 13, to display that an abnormality has occurred in the raw material passage 13 on the display unit 73. However, the present invention is not limited to this. For example, the vertical firing furnace 1 may be configured to perform the above display and to control the raw material charging speed and raw material charging amount by the charging device, the combustion power of the upper burner 16a and the lower burner 17a, and the discharge speed and discharge amount of the fired product by the fired product discharge port 18 based on the judgment result of the judgment unit 71b.

[0057] In addition, based on the judgment result of the judgment unit 71b, the feeding device may be configured to preferentially feed raw materials to locations where the distance from the level meter 60 to the upper end of the raw material packed bed A changes quickly, and to feed a smaller amount of raw materials to locations where the distance to the upper end of the raw material packed bed A changes slowly; based on the judgment result of the judgment unit 71b, the upper burner 16a and the lower burner 17a may be configured to increase the combustion firepower at locations where the distance to the upper end of the raw material packed bed A changes quickly, and to decrease the combustion firepower at locations where the distance to the upper end of the raw material packed bed A changes slowly; and based on the judgment result of the judgment unit 71b, the calcined product discharge port 18 may be configured to decrease the calcined product discharge speed and discharge amount at locations where the distance to the upper end of the raw material packed bed A changes quickly, and to increase the calcined product discharge speed and discharge amount at locations where the distance to the upper end of the raw material packed bed A changes slowly.

[0058] Furthermore, in this embodiment, the level gauge 60 has been described as being arranged above the raw material passage 13, but this is not limited to this. For example, the level gauge 60 may be configured to be arranged at equal intervals in the axial direction on the inner surface of the outer cylinder 11.

[0059] It is apparent from the claims that the above-mentioned modifications are included within the scope of the present invention. [Explanation of symbols]

[0060] 1: Vertical firing furnace 10:Furnace body 10a: Furnace top 10b: Inlet 10c: Upper lid 11: Outer cylinder 12: Inner cylinder 12a: Upper inlet 12b: Lower inlet 13: Raw material aisle 14: Upper connecting member 15: Lower connecting member 16: Upper combustion chamber 16a: Upper burner 17: Lower combustion chamber 17a: Lower burner 18: Baked product outlet 20: Heat exchanger 30: Blower 40: Injector 50: Exhaust fan 60: Level gauge 70: Control device 71: Control section 71a: Calculation part 71b: Judgment section 72: Storage section 73:Display section A: Raw material filling layer

Claims

1. A vertical firing furnace having an outer cylinder, an inner cylinder, and a raw material passage formed between the outer cylinder and the inner cylinder, for firing raw materials filled in the raw material passage, a plurality of level gauges provided at intervals in a circumferential direction of the raw material passage above the raw material passage, the level gauges being capable of continuously detecting the position of an upper end of a raw material packed bed formed by filling the raw material in the raw material passage; a calculation unit that calculates a speed at which a distance from each of the level gauges to an upper end of the raw material packed bed changes using measurement data measured by the level gauges, and calculates an average of the calculated speeds for each of the level gauges; a determination unit that determines conditions for firing the raw material using the speed and the average of the speed calculated by the calculation unit; Possesses A vertical firing furnace characterized by the above.

2. The level meter is configured to continuously measure the distance from the level meter to the upper end of the raw material packed bed, thereby continuously detecting the position of the upper end of the raw material packed bed.

2. The vertical firing furnace according to claim 1 .

3. The level meter is configured to detect the position of the upper end of the raw material packed bed by irradiating electromagnetic waves toward the raw material packed bed, receiving reflected waves that are electromagnetic waves reflected at the upper end of the raw material packed bed, and continuously measuring the distance to the upper end of the raw material packed bed.

3. The vertical firing furnace according to claim 1 or 2.

4. A memory unit that continuously stores measurement data measured by the level meter; A display unit that displays the measurement data stored in the memory unit; Further comprising The vertical firing furnace according to any one of claims 1 to 3.

5. The calculation unit is configured to calculate the speed and an average of the speed by using the measurement data stored in the storage unit, The display unit is configured to display a determination result of the determination unit.

5. The vertical firing furnace according to claim 4.

6. the determination unit is configured to detect an abnormality in the raw material passage using the determination result, The display unit is configured to display, when the determination unit detects an abnormality in the raw material passage, that an abnormality has occurred in the raw material passage.

6. The vertical firing furnace according to claim 5.

7. The level gauge is provided at the top of the furnace. The vertical firing furnace according to any one of claims 1 to 6.

8. A method for measuring the height of a raw material packed bed in a vertical firing furnace having an outer cylinder, an inner cylinder, and a raw material passage formed between the outer cylinder and the inner cylinder, the method measuring the height of a raw material packed bed formed by filling the raw material in the raw material passage of the vertical firing furnace which fires the raw materials filled in the raw material passage, comprising: a measuring step of continuously detecting the position of the upper end of the raw material packed bed by a plurality of level gauges provided at intervals in a circumferential direction of the raw material passage above the raw material passage; a calculation step of calculating a speed at which the distance from each of the level gauges to the upper end of the raw material packed bed changes for each of the level gauges using measurement data measured by the level gauges, and calculating an average of the calculated speeds for each of the level gauges; a determination step of determining conditions for firing the raw material using the speed and the average of the speed calculated in the calculation step; A method for measuring the height of a raw material packed bed, comprising:

9. The measuring step continuously detects the position of the upper end of the raw material packed bed by continuously measuring the distance to the upper end of the raw material packed bed.

9. The method for measuring the height of a raw material packed bed according to claim 8.

10. The measuring step includes irradiating electromagnetic waves toward the raw material packed bed using a level meter, receiving reflected waves that are electromagnetic waves reflected at the upper end of the raw material packed bed, and continuously measuring the distance to the upper end of the raw material packed bed, thereby continuously detecting the position of the upper end of the raw material packed bed.

10. The method for measuring the height of a raw material packed bed according to claim 8 or 9.

11. a storage step of continuously storing the measurement data obtained by the measurement step; a display step for displaying the measurement data stored by the storage step; Further comprising The method for measuring the height of a raw material packed bed according to any one of claims 8 to 10.

12. The calculation step further includes a step of calculating the speed and an average of the speeds using the measurement data stored by the storage step, The display step further includes a step of displaying a result of the determination step. The method for measuring the height of a raw material packed bed according to claim 11.

13. The determining step further includes a step of detecting an abnormality in the raw material passage using the determination result, The display step further includes a step of displaying, when an abnormality in the raw material passage is detected in the determination step, that an abnormality has occurred in the raw material passage. The method for measuring the height of a raw material packed bed according to claim 12.

14. A fired product is produced using the vertical firing furnace according to any one of claims 1 to 7. A method for producing a baked product comprising the steps of:

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