JP2019070485A - Storage system for solid fuel, and storage method for solid fuel - Google Patents

Abstract

To provide a storage system for a solid fuel capable of appropriately suppressing exothermic heat of the solid fuel inside of a silo.SOLUTION: A storage system for a solid fuel comprises: a filling structure detection mechanism for detecting a filling structure of a solid fuel stored in a silo by muography; a database in which a quality of the solid fuel and the filling structure detected by the filling structure detection mechanism are stored in relation to each other; and a control mechanism for controlling a throw condition of the next solid fuel into the silo based on the data stored in the database. Preferably, the control mechanism includes: reference means for referencing a solid fuel having a quality closest to a quality of the next solid fuel from among the data stored in the database; and throw-in position control means for controlling a throw-in position of the next solid fuel based on a filling structure of the solid fuel which is referenced by the reference means.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a solid fuel storage system and a solid fuel storage method.

  Solid fuel such as coal used for power generation such as a thermal power plant is temporarily stored in a silo before being introduced into the power plant. In general, solid fuel having a constant distribution in particle diameter and the like is stored in the silo, and after all the solid fuel is discharged, the next solid fuel is stored.

  The inside of this silo is normally sealed to suppress the scattering of dust. In addition, the bottom of this silo has an opening for discharging solid fuel. Therefore, since the silo vents from the bottom, the solid fuel may generate heat due to oxidation in the silo.

  As a method of suppressing heat generation of solid fuel in the silo, a method of supplying an inert gas such as dry ice or nitrogen gas into the silo is adopted. For example, in Japanese Patent Laid-Open No. 11-230835, a rod body which can be inserted and withdrawn inside the silo is provided on the center cone of the lower part of the silo storing the granular material, and a gas flow path opened inside the silo is provided for this rod body. Is disclosed. This publication describes an arrangement in which an inert gas supply device is provided in the gas flow path and the inert gas is supplied from the inert gas supply device to the inside of the silo to prevent heat generation of the solid fuel.

Japanese Patent Application Publication No. 11-230835

  However, in the method described in the above-mentioned publication, after detecting the heat generation of the solid fuel by the thermometer, the inert gas is supplied to the heat generation site. Therefore, this method can not suppress the generation of heat generation of the solid fuel itself. Further, in the configuration described in the above-mentioned publication, only the temperature near the center of the bottom inside the silo can be measured by the thermometer. Therefore, according to this configuration, when a heat generation site is generated in a place other than the vicinity of the bottom center inside the silo, the heat generation site can not be detected. Therefore, according to the configuration described in this publication, the heat generation of the solid fuel may not be suppressed depending on the heat generation position.

  In addition, as a method for suppressing the heat generation of solid fuel in the silo, it is also conceivable to humidify or add water to the solid fuel before being introduced into the silo. However, according to this method, the power generation efficiency is lowered due to the increase of the moisture content of the solid fuel, and the emission ratio of carbon dioxide per unit calorific value is increased. Therefore, this method has problems in terms of economy, environment and the like.

  The present invention has been made based on such circumstances, and it is an object of the present invention to provide a solid fuel storage system and a solid fuel storage method capable of appropriately suppressing heat generation of solid fuel in a silo. .

  The storage system for solid fuel according to the present invention made to solve the above problems comprises a filling structure detection mechanism for detecting the filling structure of solid fuel stored in a silo by means of muography, the quality of the solid fuel, and the filling A database that associates and stores data of the filling structure detected by the structure detection mechanism, and a control mechanism that controls the next solid fuel injection condition into the silo based on the data accumulated in the database Prepare.

  The solid fuel introduced into the silo has a certain quality such as the moisture content and the particle size. The solid fuel filling structure in the silo is affected by this quality. Since the solid fuel filling structure affects the gas flow path in the silo, controlling the filling structure can suppress the generation of heat generation of the solid fuel itself in the silo. The solid fuel storage system can detect the filling structure of the solid fuel stored in the silo by the filling structure detection mechanism. Therefore, the storage system of the solid fuel can associate the data of the quality of the solid fuel with the data of the filling structure detected by the filling structure detection mechanism and store them in the database. The solid fuel storage system controls the next solid fuel injection condition based on the above data stored in this database by the control mechanism, thereby the solid fuel filling structure in the next solid fuel silo It can control so that it is hard to generate heat. Therefore, the storage system for the solid fuel can appropriately suppress the heat generation of the solid fuel in the silo. In addition, "muography" means the imaging method using muon (mu particle).

  Among the data stored in the database, the control mechanism refers to the solid fuel having the quality closest to the quality of the next solid fuel, and the solid fuel filled with the solid fuel referred to by the query. It is preferable to include an injection position control means for controlling the injection position of the next solid fuel based on the structure. As described above, the control mechanism inquired by the inquiry means for inquiring the solid fuel having the quality closest to the quality of the next solid fuel among the data stored in the database. The solid fuel filling structure in the next solid fuel silo is more suitable for the solid fuel to be less likely to generate heat by providing the following solid fuel charging position control means for controlling the solid fuel charging position based on the solid fuel filling structure. Can be controlled.

  The injection position control means may control the injection position of the solid fuel so as to reduce the void distribution. Thus, the heat generation of the solid fuel can be suppressed easily and reliably by controlling the injection position of the solid fuel so that the above-mentioned injection position control means reduces the void distribution.

  The quality of the solid fuel may include particle size distribution or amount of attached water. Since the solid fuel filling structure in the silo tends to depend on the particle size distribution and the attached water content of the solid fuel, the quality of the solid fuel includes the particle size distribution or the attached water content, so that the next solid fuel in the silo of the solid fuel The filling structure can be more appropriately controlled so that the solid fuel does not generate heat easily.

  The solid fuel storage method according to the present invention, which has been made to solve the above problems, includes the steps of detecting the filling structure of the solid fuel stored in the silo by muography, the quality of the solid fuel, and the filling structure. And storing the data of the filling structure detected in the detecting step in association with each other, and controlling the next solid fuel injection condition into the silo based on the data accumulated in the accumulating step. .

  The said solid fuel storage method can detect the filling structure of the solid fuel stored in a silo by a filling structure detection process. Therefore, the storage method of the solid fuel can associate and store data of the quality of solid fuel in the storage step and the data of the filling structure detected in the filling structure detection step. The solid fuel storage method is characterized in that the solid fuel filling structure in the next solid fuel silo is controlled by controlling the next solid fuel injection condition in the control step based on the data accumulated in the accumulation step. Can be controlled so that it is difficult to generate heat. Therefore, the storage method of the said solid fuel can suppress appropriately heat_generation | fever of the solid fuel in a silo.

  As described above, the solid fuel storage system and the solid fuel storage method of the present invention can appropriately suppress the heat generation of the solid fuel in the silo.

It is a schematic diagram which shows the storage system of the solid fuel which concerns on one Embodiment of this invention. It is a schematic diagram which shows the muon detection part of the storage system of the solid fuel of FIG. It is a figure which shows an example of the data structure of the database of the storage system of solid fuel of FIG. It is a figure which shows the system configuration | structure of the drive control part of the storage system of the solid fuel of FIG. It is a flowchart which shows the storage method of solid fuel using the storage system of solid fuel of FIG. It is a flowchart which shows the detail of the filling structure detection process of the storage method of the solid fuel of FIG. It is a flowchart which shows the detail of the control process of the storage method of the solid fuel of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Solid fuel storage system]
The solid fuel storage system shown in FIG. 1 includes a filling structure detection mechanism 2 for detecting the filling structure X of the solid fuel F stored in the silo 1 by muography, data of the quality of the solid fuel F, and the filling structure detection mechanism 2 It comprises a database 3 for storing data of the detected filling structure X in association with each other, and a control mechanism 4 for controlling the condition for inputting the next solid fuel F into the silo 1 based on the above data stored in the database 3 .

(silo)
The silo 1 has a bottomed cylindrical main body 11. The main body 11 stores the solid fuel F inside. The main body 11 has a cylindrical peripheral wall 11 a whose central axis extends in the vertical direction, and a bottom wall 11 b which seals the lower opening of the peripheral wall 11 a. The peripheral wall 11a is formed in a cylindrical shape, a polygonal cylindrical shape or the like in which the inner diameter is substantially uniform in the vertical direction. Moreover, the silo 1 has the roof part 12 which seals the upper opening of the surrounding wall 11a. The roof portion 12 is continuous with the upper end edge of the peripheral wall 11a, and is an inclined portion which inclines upward in the central axis direction of the peripheral wall 11a, and a ceiling wall portion which is continuous with the upper end edge of the inclined portion And.

  The roof portion 12 is formed with a solid fuel inlet 13 for injecting the solid fuel F. The solid fuel inlet 13 is configured to be openable and closable so as to be opened when the solid fuel F is introduced into the main body 11. In addition, solid fuel for charging the solid fuel F into the silo 1 (the internal space of the main body 11 and the roof portion 12) to the roof portion 12 via the solid fuel inlet 13 above the solid fuel inlet 13 A feeding conveyor 14 and a water sprinkling unit 15 capable of sprinkling the solid fuel F when the solid fuel F generates heat or is ignited are provided. Further, at the upper part in the silo 1, a filling position adjusting conveyor 16 is provided which adjusts the filling position of the solid fuel F introduced by the solid fuel injection conveyor 14 in the silo. The filling position adjusting conveyor 16 is fixed to the inside of the roof 12 by, for example, a fixing member (not shown). The filling position adjusting conveyor 16 is configured to be adjustable in angle in the flow direction of the conveyor. In addition, the filling position adjusting conveyor 16 may be configured to be rotatable, for example, in the circumferential direction of the peripheral wall 11a.

  The solid fuel outlet 17 for discharging the solid fuel F is formed in the bottom wall 11b. The solid fuel outlet 17 is configured to be openable and closable so as to be opened when the solid fuel F is discharged. Further, a solid fuel discharging conveyor 18 is provided below the bottom wall 11b. The solid fuel discharging conveyor 18 is configured to be able to transport the solid fuel F discharged from the solid fuel outlet 17 out of the silo 1. The solid fuel discharging conveyor 18 is preferably configured such that the end on the downstream side in the transport direction can be sealed in the apparatus so that the inflow of the outside air into the silo 1 can be suppressed.

  As a minimum of capacity of solid fuel F which can be stored in silo 1, 10,000t is preferred and 20,000t is more preferred. On the other hand, as an upper limit of the said capacity | capacitance, 100,000t is preferable and 70,000t is more preferable. If the above capacity is smaller than the above lower limit, the amount of solid fuel F that can be stored in the silo 1 becomes insufficient, and a large number of silos 1 are needed to store a sufficient amount of solid fuel F, storage space and storage Cost may increase. Conversely, when the capacity exceeds the upper limit, there is a possibility that it becomes difficult to control the solid fuel F filling structure X in the silo 1.

  The average inner diameter of the peripheral wall 11a can be, for example, 3 m or more and 50 m or less. The average height of the peripheral wall 11a can be, for example, 4 m or more and 60 m or less. When the silo 1 is a coal silo, the average inner diameter of the peripheral wall 11a can be, for example, 20 m to 50 m, and the average height of the peripheral wall 11 a can be, for example, 10 m to 60 m.

(Solid fuel)
The solid fuel storable in the silo 1 includes, for example, coal, biomass and the like available for power generation. Examples of the coal include bituminous coal and sub-bituminous coal. In addition, below, the case where coal is used as the solid fuel F is demonstrated to an example.

(Filling structure detection mechanism)
The filling structure detection mechanism 2 has a plurality of muon detecting units 19 that detect muons in the silo 1, and a filling structure calculating unit 20.

  Muons are extremely permeable particle beams that are generated by reacting with the atmosphere after high energy primary cosmic rays reach the atmosphere, and fall to the ground. Muons have no nuclear force but only electromagnetic force with other particles. For this reason, the penetration force is high and the analysis of the interaction is easy as compared with the one having the intensity decay of both the electromagnetic force and the nuclear force such as pions, protons and neutrons. Furthermore, detection is relatively easy because of the charge.

  The muon detection unit 19 detects the intensity of muon. More specifically, the muon detection unit 19 detects, for example, the muon arrival amount and the arrival direction. The specific configuration of the muon detector 19 is not particularly limited as long as muon in the silo 1 can be detected. The muon detection unit 19 can be configured to have, for example, a plurality of scintillation detectors 21 and 22 shown in FIG.

  The scintillation detectors 21 and 22 have a plurality of modules having a plastic scintillator extending in a first direction (for example, horizontal direction) and a photomultiplier tube provided at one end thereof in parallel in a direction orthogonal to the first direction (for example, vertical direction) A plurality of modules including first detection units 21a and 22a disposed, a plastic scintillator extending in a direction (for example, the vertical direction) orthogonal to the first direction, and a plurality of photomultipliers provided at one end thereof The second detection units 21b and 22b arranged in parallel in the horizontal direction) are stacked. In the muon detection unit 19, a plurality of (two in FIG. 2) scintillation detectors 21 and 22 are disposed at predetermined intervals in the stacking direction of the units.

  A muon detection mechanism by the muon detection unit 19 will be described. When muons fly from within silo 1 and pass through scintillation detectors 21 and 22, the plastic scintillator disposed in the muon path emits light, and a pulse signal is output from the photomultiplier provided in the plastic scintillator. . The muon detection unit 19 acquires information on the muon flying amount and flying direction from the coordinates at which the muon passes through the plurality of scintillation detectors 21 and 22 and the interval between the scintillation detectors 21 and 22.

  The filling structure calculation unit 20 is configured to include a central processing unit (CPU) and a storage unit such as a read only memory (ROM) and a random access memory (RAM). The filling structure calculation unit 20 calculates the filling structure X of the solid fuel F based on the intensity distribution of muons detected by the plurality of muon detection units 19. The filling structure calculation unit 20 calculates the muon path based on, for example, the muon arrival direction, and detects the muon attenuation for each path to calculate the solid fuel F filling structure (solid fuel F density distribution). .

  The plurality of muon detectors 19 are provided on the side and below the main body 11. The said solid fuel storage system can detect the filling structure X with high precision by the filling structure detection mechanism 2 having the some muon detection part 19 in the side of the main body 11, and the downward direction. In the storage system for the solid fuel, a plurality of muon detection units 19 may be fixed to the side and the lower side of the main body 11, respectively. Moreover, the storage system of the said solid fuel may have several muon detection part 19 which can move along the surrounding wall 11a of the main body 11, and the bottom wall 11b. As a configuration for moving the muon detection unit 19 along the peripheral wall 11a and the bottom wall 11b of the main body 11, for example, a guide rail (not shown) is provided along the peripheral wall 11a and the bottom wall 11b, and the muon detection unit 19 is And the like. The solid fuel storage system can detect muons in the silo 1 simultaneously at a plurality of locations by fixing a relatively large number of muon detectors 19 to the side and lower of the main body 11, and the filling structure X can be detected earlier (in real time). On the other hand, the storage system of the said solid fuel can reduce the number of the muon detection parts 19, and can reduce equipment cost, when it comprises the some muon detection part 19 so that a movement is possible.

  When a plurality of muon detection units 19 are disposed laterally of the main body 11, the plurality of muon detection units 19 are preferably disposed at opposing positions across the central axis of the peripheral wall 11a. It is preferable that the plurality of muon detection units 19 be disposed in the axial direction of the peripheral wall 11 a in a range of two or more and eight or less. The plurality of muon detection units 19 may be disposed in close contact with the peripheral wall 11a, but from the viewpoint of more easily and reliably detecting the muon arrival amount and the arrival direction in the entire region of the silo 1, the space Preferably, the When the plurality of muon detectors 19 are arranged at an interval from the peripheral wall 11a, the distance between the peripheral wall 11a and the plurality of muon detectors 19 can be, for example, 10 m or more and 50 m or less. When a plurality of muon detectors 19 are disposed below the main body 11, the number of muon detectors 19 below the main body 11 can be, for example, 2 or more and 8 or less.

(Database)
The database 3 stores the data of the solid fuel F filling structure X stored in the silo 1 in association with the data of the solid fuel F quality. In the solid fuel storage system, when one unit of solid fuel F is introduced into the silo 1, the entire unit of solid fuel F is discharged from the silo 1 and then the next unit of solid fuel F is injected into the silo 1. It is thrown in. The solid fuel storage system stores, for example, the relationship between the quality of the solid fuel F and the filling structure X in the database 3 for each unit of solid fuel F input. That is, in the database 3, the relationship between the quality of the solid fuel F before the time of the previous injection and the filling structure X is stored in association with each other. The storage system of the said solid fuel is comprised by the control mechanism 4 so that control of the injection | throwing-in conditions of the solid fuel F is possible, as mentioned later. The database 3 stores the quality of the solid fuel F and the input condition of the solid fuel F in association with the filling structure in the silo 1 of the solid fuel F detected by the filling structure detection mechanism 2. The storage system of the solid fuel suppresses the heat generation in the silo 1 of the solid fuel F from the next time on by controlling the injection condition of the solid fuel F from the next time on the basis of the data accumulated in the database 3.

  Examples of the quality of the solid fuel F accumulated in the database 3 include the type (carbon type) specified by the carbon content etc., the particle size distribution, the amount of attached water, the HGI (hard glove crushability index), and the like. Specific examples of the type include bituminous coal and sub-bituminous coal, which may be further subdivided based on the carbon content (eg, O / C (oxygen / carbon) ratio inherent to coal etc.). The amount of attached water refers to a value calculated by total water and constant moisture, with the moisture balanced in an environment of RH = 75% as constant moisture. HGI refers to a value calculated according to JIS M8801: 2004.

  The quality of the solid fuel F accumulated in the database 3 preferably includes the particle size distribution or the amount of attached water, and more preferably includes both the particle size distribution and the amount of attached water. The solid fuel F to be introduced into the silo 1 often has different particle diameter distributions and water contents such as moisture content, depending on the place of production and the like. The filling structure X of the solid fuel F in the silo 1 is affected by the quality of the solid fuel F. For example, the ease of rolling from the injection position of the solid fuel F is likely to be influenced by the particle size of the solid fuel F and the amount of adhering water. Since the filling structure X of the solid fuel F affects the flow path of the gas in the silo 1, by controlling the filling structure X, the generation itself of heat generation of the solid fuel F in the silo 1 can be suppressed. Therefore, by including the particle size distribution or the amount of attached water that easily affects the filling structure X as the quality, the filling structure X in the silo 1 of the next solid fuel F is more appropriately made such that the solid fuel F is less likely to generate heat. Can be controlled.

  An example of the data structure of the database 3 of the storage system of the said solid fuel is demonstrated with reference to FIG. In FIG. 3, the values of the respective items are shown in alphabets, but this value may be, for example, a specific numerical value, and is divided in advance corresponding to a certain range of values (or structure etc.) It may be a standard.

  In FIG. 3, as the quality of the solid fuel F, the type (carbon type), the particle size distribution, the amount of adhering water, and the HGI are used. Further, in FIG. 3, under what input conditions solid fuel F of these qualities was input (input conditions) and as a result what kind of filling structure X was obtained (filling structure) the quality of solid fuel F Associated with. As the filling structure in the table of FIG. 3, the void distribution data of the filling structure X calculated based on the data of the filling structure X, for example, in addition to the data of the filling structure X detected by the filling structure detection mechanism 2 It is also possible to use air flow resistance data calculated from the void distribution data. The void distribution and the ventilation resistance of the filling structure X can be calculated by a filling structure analysis unit (not shown) configured to include, for example, a CPU, and a storage unit such as a ROM, a RAM, and the like. Also, the filling structure analysis unit may be configured by the same computer as the filling structure calculation unit 20.

(Control mechanism)
The control mechanism 4 has the solid fuel injection conveyor 14 and the filling position adjustment conveyor 16 described above. The control mechanism 4 also has a drive control unit 23 that drives and controls the solid fuel injection conveyor 14 and the filling position adjustment conveyor 16 based on the data stored in the database 3.

(Drive control unit)
The drive control unit 23 is configured to include a CPU and a storage unit such as a ROM and a RAM. The drive control unit 23 may be configured by, for example, the same computer as the filling structure calculation unit 20, or may be configured by a separate computer.

  As shown in FIG. 4, the drive control unit 23 includes an inquiring unit 23 a and a closing position control unit 23 b.

  Among the data stored in the database 3, the query means 23a queries the solid fuel having the quality closest to the quality of the next solid fuel F. The inquiring means 23a collates, for example, the standard value of the solid fuel F stored in the database 3 with the standard value of the next solid fuel F, and the solid fuel F having a quality closest to the quality of the next solid fuel F Extract

  The injection position control means 23b controls the injection position of the next solid fuel F based on the filling structure X of the solid fuel F queried by the inquiry means 23a. The charging position control means 23 b controls the charging position of the next solid fuel F, for example, by adjusting the inclination and rotational speed of the filling position adjusting conveyor 16. Further, the charging position control means 23b may control the charging position of the next solid fuel F by controlling the rotational speed and the like of the solid fuel charging conveyor 14.

  The charging position control means 23b inputs the solid fuel F so that the void distribution of the filling structure X of the next solid fuel F becomes small, for example, from the relation between the charging condition of the solid fuel F extracted by the inquiry means 23a and the filling structure X It is preferred to control the position. When the voids of the filling structure X are unevenly distributed, a region through which gas can easily pass in the filling structure X is likely to be locally formed. As a result, the solid fuel F is easily oxidized in this region, and as a result, the solid fuel F present in this region is likely to generate heat. Therefore, the heat generation of the solid fuel F can be suppressed easily and reliably by controlling the injection position of the solid fuel F so that the injection position control means 23b reduces the void distribution.

  The input position control means 23b converts, for example, the data of the filling structure X extracted by the inquiry means 23a into a parameter of air flow resistance. The injection position control means 23b simulates the flow of gas in the next solid fuel F filling structure X based on this parameter, and controls the next solid fuel F injection position. In the solid fuel storage system, when the data of the air flow resistance of the filling structure X is already stored in the database 3, the input position control means 23b need to convert the data of the filling structure X into the air flow resistance parameter Absent. Moreover, when the data of the optimal filling structure X are accumulate | stored in the database 3, you may employ | adopt the injection | throwing-in conditions corresponding to this data as it is.

  The storage system of the solid fuel refers to the query means 23a for the control mechanism 4 to query the solid fuel F having the quality closest to the quality of the next solid fuel F among the data stored in the database 3, and And a charging position control means 23b for controlling the charging position of the next solid fuel F based on the filling structure X of the solid fuel F inquired by the means 23a, the filling structure of the next solid fuel F in the silo 1 X can be more appropriately controlled so that the solid fuel F does not generate heat easily.

  Note that, in the solid fuel storage system, the filling mechanism detection mechanism 2 also detects the filling structure X for the solid fuel F introduced into the silo 1 through the control by the control mechanism 4. Further, the data of the filling structure X is stored in the database 3 in association with the quality of the solid fuel F. Thereby, this data is configured to be inquirable at the next injection of the solid fuel F.

<Advantage>
The solid fuel storage system can detect the filling structure X of the solid fuel F stored in the silo 1 by the filling structure detection mechanism 2. Therefore, the storage system of the solid fuel can store the data of the quality of the solid fuel F and the data of the filling structure X detected by the filling structure detection mechanism 2 in the database 3 in association with each other. The solid fuel storage system controls the next solid fuel F injection condition based on the above data stored in the database 3 by the control mechanism 4 to make the next solid fuel F filling structure X in the silo 1 Can be controlled so that the solid fuel F does not easily generate heat. Therefore, the storage system for the solid fuel can appropriately suppress the heat generation of the solid fuel F in the silo 1.

  The storage system of the solid fuel does not require the supply of the inert gas into the silo 1, so the storage period of the solid fuel F can be extended more safely. Moreover, according to the storage system of the said solid fuel, since it becomes possible to use also about the carbon type which was difficult to store in the silo 1 conventionally, the range of selection of resources can be expanded. Furthermore, since the storage system for the solid fuel does not need to increase the moisture content of the solid fuel F itself, it does not cause a decrease in power generation efficiency or an increase in carbon dioxide per unit power generation amount.

[Method of storing solid fuel]
Next, a method of storing solid fuel using the solid fuel storage system will be described. Below, the storage method of the solid fuel at the time of using the storage system of the solid fuel of FIG. 1 is demonstrated.

  The solid fuel storage method is, as shown in FIG. 5, a step of detecting the filling structure X of the solid fuel F stored in the silo 1 by muography (filling structure detection step), the quality of the solid fuel F and the above A step (accumulation step) of correlating and storing data of the filling structure X detected in the filling structure detection step and a condition for introducing the next solid fuel F into the silo 1 based on the data accumulated in the above accumulation step And a step of controlling (control step).

(Filling structure detection process)
In the filling structure detection step (S01), as shown in FIG. 6, a step of detecting muons in the silo 1 (muon detection step) and a step of calculating the filling structure X of the solid fuel F in the silo 1 (filling structure Calculation step). The muon detection step (S11) is performed by the plurality of muon detectors 19. In S11, for example, the amount and direction of muon arrival in the silo 1 are detected. The filling structure calculating step (S12) is performed by the filling structure calculating unit 20. In S12, for example, the muon path is calculated based on the muon arrival direction detected in S11, and the muon attenuation for each path is detected to detect the filling structure X of solid fuel F (density distribution of solid fuel F). calculate.

(Accumulation process)
In the storage step (S02), data of the filling structure X of the solid fuel F stored in the silo 1 is stored in association with the data of the quality of the solid fuel F. S02 is configured to include the database 3. In S02, for example, data of the quality of the solid fuel F and data of the filling structure X are stored in association with each unit of injection of the solid fuel F. Examples of the quality of the solid fuel F accumulated in S02 include the type (carbon type) specified by the carbon content etc., the particle size distribution, the amount of attached water, the HGI (hard glove crushability index), and the like.

(Control process)
The control step (S03) is performed by the solid fuel injection conveyor 14, the filling position adjustment conveyor 16, and the drive control unit 23. As shown in FIG. 7, S03 has an inquiry step (S31) and an input position control step (S32).

  In S31, the solid fuel having the quality closest to the quality of the next solid fuel F is inquired from among the data accumulated in S02. In S32, based on the filling structure X of the solid fuel F inquired in S31, the injection position of the next solid fuel F is controlled. In S32, the injection position of the next solid fuel F is controlled by adjusting, for example, the inclination and rotational speed of the filling position adjusting conveyor 16. Further, at S32, the next solid fuel F charging position may be controlled by controlling the rotational speed or the like of the solid fuel charging conveyor 14. In S32, it is preferable to control the injection position of the solid fuel F so that the void distribution of the filling structure X of the next solid fuel F becomes small from the relation between the injection condition of the solid fuel F extracted in S31 and the filling structure X .

  In addition, in the storage method of the said solid fuel, it returns to S01 also about the solid fuel F thrown in in the silo 1 through S03, and the filling structure X is detected. Further, the data of the filling structure X is stored in association with the quality of the solid fuel F in S02. Thereby, this data is configured to be inquirable at the next injection of the solid fuel F.

<Advantage>
The storage method of the solid fuel can detect the filling structure X of the solid fuel F stored in the silo 1 in the filling structure detection step (S01). Therefore, the storage method of the said solid fuel can link | relate and accumulate | store the data of the quality of solid fuel F, and the data of the filling structure X detected by S01 by the accumulation | storage process (S02). The solid fuel storage method is based on the above-mentioned data stored in S02, and by controlling the next solid fuel F injection condition in the control step (S03), the next solid fuel F filling structure in the silo 1 X can be controlled so that the solid fuel F does not easily generate heat. Therefore, the storage method of the solid fuel can appropriately suppress the heat generation of the solid fuel F in the silo 1.

  The solid fuel storage method does not require the supply of the inert gas into the silo 1, so the storage period of the solid fuel F can be extended more safely. Moreover, according to the storage method of the said solid fuel, since it becomes possible to use also about the carbon type which was difficult to store in the silo 1 conventionally, the range of selection of resources can be expanded. Furthermore, the storage method of the solid fuel does not require increasing the moisture content of the solid fuel F itself, and therefore does not cause a decrease in power generation efficiency or an increase in carbon dioxide per unit power generation amount.

Other Embodiments
The above embodiment does not limit the configuration of the present invention. Therefore, the above-mentioned embodiment can omit, substitute or add the components of each part of the above-mentioned embodiment based on the description of the present specification and technical common sense, and all of them are interpreted as belonging to the scope of the present invention It should.

  For example, the specific configuration of the silo is not limited to the configuration of the above embodiment. In addition, the above-mentioned filling structure detection mechanism does not necessarily have to detect the filling structure of solid fuel directly, and may calculate the filling structure of this solid fuel indirectly by calculating the void distribution of the solid fuel. .

  The muon detection unit does not necessarily have to be provided on the side and below the main body of the silo, and may be provided, for example, only on one of the lower side and the side of the main body.

  Among the data stored in the database, the control mechanism is a query means for querying the solid fuel having the quality closest to the quality of the next solid fuel, and the solid fuel filling structure queried by the query means. It is not necessary to have an injection position control means for controlling the injection position of the next solid fuel based on that. The solid fuel storage system may weight items of quality stored in the above-mentioned database, for example, and may make a quality inquiry by emphasizing the high quality of the weight. Further, the injection position control means may control the injection position of the solid fuel so that the porosity of the whole of the filling structure becomes the lowest, and the solid matter makes the ventilation amount of the whole of the filling structure the lowest. The fuel injection position may be controlled. Furthermore, the input position control means need not necessarily control the next solid fuel input position by adjusting the inclination and rotational speed of the filling position adjusting conveyor, and the control method of the input position is the specific method of the silo. It can be designed appropriately according to the configuration.

  As described above, since the solid fuel storage system and the solid fuel storage method of the present invention can appropriately suppress the heat generation of the solid fuel in the silo, it is suitable for long-term storage of the solid fuel in the silo There is.

DESCRIPTION OF SYMBOLS 1 Silo 2 Filling structure detection mechanism 3 Database 4 Control mechanism 11 Body 11a Peripheral wall 11b Bottom wall 12 Roof part 13 Solid fuel inlet 14 Conveyor for solid fuel injection 15 Spraying part 16 Conveyor for filling position adjustment 17 Solid fuel outlet 18 Solid fuel Conveying agent 19 Muon detection unit 20 Filling structure calculation unit 21, 22 scintillation detector 21a, 22a First detection unit 21b, 22b Second detection unit 23 Drive control unit 23a Inquiry means 23b Loading position control means F Solid fuel X Packing structure

Claims (5)

A filling structure detection mechanism for detecting the filling structure of solid fuel stored in a silo by means of muography;
A database that associates and accumulates the quality of the solid fuel and the data of the filling structure detected by the filling structure detection mechanism;
And a control mechanism for controlling the next solid fuel injection condition into the silo based on the data stored in the database. The above control mechanism
From the data stored in the database, a query means for querying the solid fuel having the quality closest to the quality of the next solid fuel,
The solid fuel storage system according to claim 1, further comprising: injection position control means for controlling the next solid fuel injection position based on the solid fuel filling structure inquired by the inquiry means.   The solid fuel storage system according to claim 2, wherein the injection position control means controls the injection position of the solid fuel so as to reduce the void distribution.   The solid fuel storage system according to any one of claims 1 to 3, wherein the quality of the solid fuel includes a particle size distribution or an amount of adhering water. Detecting the filling structure of the solid fuel stored in the silo by muography;
Associating and storing the quality of the solid fuel and the data of the filling structure detected in the filling structure detection step;
Controlling the next solid fuel injection condition into the silo based on the data accumulated in the accumulation step.

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