JP2019060691A - Intra-silo temperature measurement system and intra-silo temperature measurement method - Google Patents

Abstract

To provide an intra-silo temperature measurement system and an intra-silo temperature measurement method with which it is possible to selectively measure the temperature of a hot portion in a silo while suppressing the possibility of heat generation.SOLUTION: The intra-silo temperature measurement system comprises: a packing structure detection mechanism 2 for detecting the packing structure of solid fuel stored in a silo 1 by muography; a heating region calculation mechanism 3 for calculating a region in the packing structure detected by the packing structure detection mechanism where heating is likely to occur; and a temperature measurement mechanism 4 for measuring the temperature of the region calculated by the heating region calculation mechanism. The intra-silo temperature measurement method includes the steps of: detecting the packing structure of solid fuel stored in a silo 1 by muography; calculating a region in the packing structure detected by the packing structure detection step where heating is likely to occur; and measuring the temperature of the region calculated by the heating region calculation step.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an in-silo temperature measurement system and an in-silo temperature measurement 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. Generally, in this silo, solid fuel having a constant distribution in water content, particle diameter and the like is stored, 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. Since the heat generation of the solid fuel can cause ignition, temperature control of the solid fuel in the silo is important.

  Conventionally, the temperature measurement of solid fuel in a silo is performed by installing a thermocouple at a certain site in the silo.

  In JP-A-11-230835, a rod capable of appearing in the silo is provided at the upper end of the center cone of the lower portion of the silo storing the granular material, and the temperature measurement in the silo in which the thermocouple is disposed on this rod An apparatus is disclosed. Further, this publication discloses a configuration in which a gas flow channel is provided in the rod body, and a gas suction device and a thermometer are disposed in the gas flow channel. The in-silo temperature measuring device described in this publication measures the temperature slightly above the top of the center cone with the above-mentioned thermocouple and measures the temperature around it with the above-mentioned thermometer.

  In addition, in JP 2009-68954, a wire rope, a wire rope in which a plurality of thermocouples wired in the longitudinal direction of the wire rope along the outer surface of the wire rope, and a plurality of thermocouples are wired A temperature measuring cable for a coal silo is disclosed which has a heat-shrinkable tube covering the outer side of the heat-shrinkable tube and a sheath formed by weaving a linear or strip metal material on the outer side of the heat-shrinkable tube. The coal silo temperature measurement cable described in the above-mentioned publication is suspended from the top of the silo, and measures the temperature at a predetermined position vertically below the top.

Japanese Patent Application Publication No. 11-230835 JP, 2009-68954, A

  As described above, the temperature in the conventional silo is measured in advance by a thermocouple or the like provided corresponding to a predetermined position in the silo. That is, conventionally, in the silo, the position where the solid fuel is likely to generate heat is predicted in advance, and the thermocouple is disposed to measure the temperature at the predicted position.

  However, when the present inventors intensively studied, it was found that the heat generation of solid fuel can not be sufficiently monitored by this conventional measurement method. That is, although the heat generation of the solid fuel is affected by the filling structure of the solid fuel in the silo, the filling structure is influenced by the quality of the solid fuel such as the moisture content and the particle size distribution. Therefore, it has been found that the high temperature part in the silo can not be accurately measured by the conventional device which can measure only the temperature at a certain position in the silo.

  On the other hand, for example, it is conceivable to increase the location of the thermocouples in the silo, but if the thermocouples are installed sloppyly, the risk of heat generation may increase due to the presence of solid fuel.

  The present invention has been made based on such circumstances, and it is possible to selectively measure the temperature of the high temperature portion in the silo while suppressing the possibility of heat generation, and the in silo temperature measurement system and the silo internal temperature measurement It is an object to provide an apparatus.

  The in-silo temperature measurement system according to the present invention, which has been made to solve the above problems, includes a filling structure detection mechanism that detects the filling structure of solid fuel stored in the silo by muography, and the above-mentioned filling structure detection mechanism. The heat generation part calculation mechanism which calculates the part which is easy to generate heat in the filling structure, and the temperature measurement mechanism which measures the temperature of the part calculated by the heat generation part calculation mechanism.

  The in-silo temperature measurement system can detect the filling structure of solid fuel stored in the silo by the filling structure detection mechanism. The in-silo temperature measurement system can calculate the heat generation site in the filling structure by the heat generation site calculation mechanism, and selectively measure the temperature of the heat generation site by the temperature measurement mechanism. The in-silo temperature measurement system is capable of selectively measuring the heat generation-prone portion of the filling structure by the temperature measurement mechanism, and therefore can suppress an increase in the number of thermometers such as thermocouples. Therefore, the in-silo temperature measurement system can suppress the possibility of heat generation of the solid fuel. In addition, "muography" means the imaging method using muon (mu particle).

  The heat generation part calculation mechanism may calculate a part of the filling structure which is easily heated based on the void distribution of the filling structure. In this manner, the heat generation site calculation mechanism calculates the heat generation-prone parts of the filling structure easily and reliably by calculating the heat-generating parts of the filling structure based on the void distribution of the filling structure. Can.

  The silo may have a bottomed cylindrical main body, and the filling structure detection mechanism may have a plurality of muon detection parts on the side and lower sides of the main body. Thus, the filling structure detection mechanism can detect the filling structure with high accuracy by having a plurality of muon detection units on the side and below the main body.

  The in-silo temperature measurement method according to the present invention, which was made to solve the above problems, includes the steps of detecting the filling structure of solid fuel stored in the silo by muography and detecting the filling structure detection step. The process of calculating the heat-releasing site | part in the said filling structure, and the process of measuring the temperature of the site | part calculated by the said heat-generating site calculation process are provided.

  The in-silo temperature measurement method can detect the filling structure of solid fuel stored in the silo in the filling structure detection step. The said in-silo temperature measurement method can selectively measure the temperature of this heat-releasing region in the temperature measurement step, after calculating the heat-releasing region of the filling structure in the heat-releasing region calculation step. Since the said in-silo temperature measurement method can selectively measure the heat | fever-prone site | part of the said filling structure by the said temperature measurement process, the increase in the number of objects of a thermocouple is thermometer can be suppressed.

  As explained above, the in-silo temperature measurement system and the in-silo temperature measurement method of the present invention can selectively measure the temperature of the high temperature portion in the silo while suppressing the possibility of heat generation.

It is a schematic diagram which shows the in-silo temperature measurement system which concerns on one Embodiment of this invention. It is a schematic diagram which shows the muon detection part of the in-silo temperature measurement apparatus of FIG. It is a flowchart which shows the in-silo temperature measurement method using the in-silo temperature measurement system of FIG. It is a figure which shows the detail of the filling structure detection process of the in-silo temperature measurement method of FIG.

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

[Silo internal temperature measurement system]
The in-silo temperature measurement system shown in FIG. 1 generates heat in the filling structure detection mechanism 2 for detecting the filling structure X of the solid fuel F stored in the silo 1 by muography and the filling structure X detected by the filling structure detection mechanism 2 The heat generation part calculation mechanism 3 which calculates the easy part, and the temperature measurement mechanism 4 which measures the temperature of the part calculated by the heat generation part calculation mechanism 3 are provided.

(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. Further, the solid fuel injection conveyor 14 for injecting the solid fuel F into the main body 11 through the solid fuel injection port 13 and the solid fuel F when the solid fuel F generates heat or fires, etc. And a water sprinkling portion 15 capable of sprinkling water.

  A solid fuel outlet 16 for discharging solid fuel F is formed in the bottom wall 11 b. The solid fuel discharge port 16 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 17 is provided below the bottom wall 11b. The solid fuel discharging conveyor 17 is configured to be able to transport the solid fuel F discharged from the solid fuel outlet 16 out of the silo 1.

  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, if the capacity exceeds the upper limit, it may be difficult to control the temperature in the silo 1. On the other hand, when the capacity is in the above range, the temperature measurement mechanism 4 facilitates the temperature of the heat-producible portion of the filling structure X while sufficiently suppressing the increase in the number of thermocouples and the like for measuring the temperature. And it can be measured reliably.

  As an average internal diameter of the surrounding wall 11a, it can be 20 m or more and 50 m or less, for example. Moreover, as average height of the surrounding wall 11a, it can be 10 m or more and 60 m or less, for example.

(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.

(Filling structure detection mechanism)
The filling structure detection mechanism 2 has a plurality of muon detecting units 18 for detecting muons in the silo 1 and a filling structure calculating unit 19.

  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 18 detects the intensity of muon. More specifically, the muon detection unit 18 detects, for example, the muon arrival amount and the arrival direction. The specific configuration of the muon detection unit 18 is not particularly limited as long as muon can be detected in the silo 1, specifically, in the inner space of the silo 1 in which the solid fuel F is stored. The muon detection unit 18 can be configured to have, for example, a plurality of scintillation detectors 20 and 21 shown in FIG.

  The scintillation detectors 20 and 21 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 each having a first detection unit 20a, 21a disposed, a plastic scintillator extending in a direction (for example, the vertical direction) orthogonal to the first direction, and a photomultiplier provided at one end thereof The second detection units 20b and 21b arranged in parallel in the horizontal direction) are stacked. In the muon detection unit 18, a plurality of (two in FIG. 2) scintillation detectors 20 and 21 are disposed at predetermined intervals in the stacking direction of the units.

  The muon detection mechanism by the muon detection unit 18 will be described. When a muon comes from within the silo 1 and passes through the scintillation detectors 20 and 21, 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 18 acquires muon flying quantity and information from the coordinates at which the muon passes through the plurality of scintillation detectors 20 and 21 and the interval between the scintillation detectors 20 and 21.

  The filling structure calculation unit 19 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 calculating unit 19 calculates the filling structure X of the solid fuel F based on the intensity distribution of muons detected by the plurality of muon detecting units 18. The filling structure calculation unit 19 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 detection units 18 are provided on the side and below the main body 11. The in-silo temperature measurement system can detect the filling structure X with high accuracy by the filling structure detection mechanism 2 having a plurality of muon detection units 18 on the side and below the main body 11. In the in-silo temperature measurement system, a plurality of muon detection units 18 may be fixed to the side and the lower side of the main body 11, respectively. Further, the in-silo temperature measurement system may have a plurality of muon detection units 18 movable along the peripheral wall 11 a and the bottom wall 11 b of the main body 11. As a configuration for moving the muon detection unit 18 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 18 is And the like. The in-silo temperature measurement system can detect muons in the silo 1 simultaneously at a plurality of locations by fixing a relatively large number of muon detection units 18 to the side and the lower side of the main body 11, and the filling structure X can be detected earlier (in real time). On the other hand, when the plurality of muon detection units 18 are configured to be movable, the in-silo temperature measurement system can reduce the number of muon detection units 18 and reduce the equipment cost.

  When a plurality of muon detection units 18 are disposed laterally of the main body 11, the plurality of muon detection units 18 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 18 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 18 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 a plurality of muon detectors 18 are disposed below the main body 11, the number of muon detectors 18 below the main body 11 can be, for example, 2 or more and 8 or less.

(Heating site calculation mechanism)
The heat generation part calculation mechanism 3 is configured to include a CPU and a storage unit such as a ROM, a RAM, and the like. The heat generation part calculation mechanism 3 may be configured by, for example, the same computer as the filling structure calculation unit 19 or may be configured by a separate computer.

  The heat generation part calculation mechanism 3 calculates a part of the filling structure X which is likely to generate heat based on the void distribution of the filling structure X. In the silo 1, solid fuel F having a constant distribution in particle diameter and the like is stored, and the voids of the filling structure X are unevenly distributed based on the particle diameter distribution and the like. Since the voids of the filling structure X form a gas flow path, it is possible to identify the heat-prone parts of the filling structure X based on the void distribution of the filling structure X. Specifically, for example, by converting the air gap of the filling structure X into the air flow resistance, it is possible to specify a portion of the filling structure X that is likely to generate heat. The storage unit of the heat generation part calculation mechanism 3 stores, for example, data in which the void distribution of the filling structure is associated in advance with the part of the filling structure which is easily heated. First, the heat generation part calculation mechanism 3 calculates the void distribution of the filling structure X from the filling structure X calculated by the filling structure calculation unit 19 (first calculation means). Subsequently, the heat generating part calculation mechanism 3 calculates a part of the filling structure X that is likely to generate heat based on the void distribution of the filling structure X calculated by the first calculating means (second calculating means). Specifically, in the second calculation means, the void distribution of the filling structure X calculated by the first calculation means is collated with the data stored in the storage unit, whereby heat generation in the filling structure X is easily generated. Calculate the site. In addition, the heat generation part calculation mechanism 3 may calculate the part of the filling structure X which is likely to generate heat from the void distribution of the filling structure X by simulation. In the in-silo temperature measurement system, the heat generation part calculation mechanism 3 calculates easily the heat generation part of the filling structure X based on the void distribution of the filling structure X. Can be calculated. In the in-silo temperature measurement system, the filling structure calculating unit 19 calculates the void distribution of the filling structure X, and the heat generating part calculating mechanism 3 calculates the void distribution of the filling structure X calculated by the filling structure calculating unit 19. The portion of the filling structure X that is likely to generate heat may be calculated.

(Temperature measurement mechanism)
The temperature measurement mechanism 4 selectively measures a portion of the solid fuel F filling structure X in the silo 1 which is susceptible to heat generation. The temperature measurement mechanism 4 has a thermometer 4 a such as a thermocouple. The temperature measurement mechanism 4 may have only one thermometer 4a, and may have a plurality of thermometers 4a. For example, when measuring temperature, the temperature measurement mechanism 4 can adopt a configuration in which the thermometer 4a is inserted into the peripheral wall 11a from the outside of the peripheral wall 11a and a portion of the filling structure X that is easily heated is measured. Further, even if the temperature measurement mechanism 4 has a control mechanism (not shown) that moves and controls the thermometer 4a so that the easily heatable portion of the filling structure X calculated by the heat generation portion calculation mechanism 3 becomes a measurement point. Good. This control mechanism can be configured to have, for example, a guide rail on which the thermometer 4a is disposed, and a control unit (both not shown) for controlling the position of the thermometer 4a on the guide rail.

<Advantage>
The in-silo temperature measurement system can detect the filling structure X of the solid fuel F stored in the silo 1 by the filling structure detection mechanism 2. In the in-silo temperature measurement system, the heat generation site calculation mechanism 3 can calculate the heat generation site of the filling structure X, and the temperature measurement mechanism 4 can selectively measure the temperature of the heat generation site. The in-silo temperature measurement system can selectively measure a portion of the filling structure X that is likely to generate heat by the temperature measurement mechanism 4, and thus can suppress an increase in the number of thermometers 4a such as thermocouples. Therefore, the in-silo temperature measurement system can suppress the possibility of heat generation of the solid fuel F. Further, the in-silo temperature measurement system is configured to insert the thermometer 4a into the silo 1 only at the time of temperature measurement, for example, to more appropriately suppress the heat generation of the solid fuel F caused by the thermometer 4a. Can.

[Silo internal temperature measurement method]
Next, a method of measuring the temperature in the silo using the temperature measuring device in the silo will be described. Below, the in-silo temperature measurement method at the time of using the in-silo temperature measurement apparatus of FIG. 1 is demonstrated.

  In the in-silo temperature measurement method, as shown in FIG. 3, detection is performed in the step of detecting the filling structure X of the solid fuel F stored in the silo 1 by muography (filling structure detection step) and the above-mentioned filling structure detection step The process of calculating the heat-releasing site in the packed structure X (heat-generating site calculating process) and the process of measuring the temperature of the site calculated in the heat-generating site calculating process (temperature measuring process).

(Filling structure detection process)
In the filling structure detection step (S01), as shown in FIG. 4, a step of detecting muons in the silo 1 (muon detection step) and a step of calculating the filling structure of the solid fuel F in the silo 1 (filling structure calculation Process). The muon detection step (S11) is performed by the plurality of muon detectors 18. 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 19. 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.

(Heating site calculation process)
The heat generation site calculation step (S02) calculates a heat generation-prone portion of the filling structure X based on the void distribution of the filling structure X. S02 is performed by the heat generation part calculation mechanism 3. In S02, for example, based on the process of calculating the void distribution of the filling structure X from the filling structure X calculated in S12 (first calculation process) and the void distribution of the filling structure X calculated in the first calculation process. And a step (second calculation step) of calculating a portion of the filling structure X that is likely to generate heat. In addition, the said in-silo temperature measurement method may have the process (1st calculation process) which S12 calculates the space | gap distribution of the filling structure X. In this case, in S02, the easily heatable portion of the filling structure X may be calculated based on the void distribution of the filling structure X calculated in S12.

(Temperature measurement process)
The temperature measurement step (S03) selectively measures a portion of the solid fuel F filling structure X in the silo 1 which is likely to generate heat. S03 is performed by the temperature measurement mechanism 4.

<Advantage>
The said in-silo temperature measurement method can detect the filling structure X of the solid fuel F stored in the silo 1 by a filling structure detection process (S01). In the in-silo temperature measurement method, after calculating the heat generation site in the filling structure X in the heat generation site calculation process (S02), the temperature measurement process (S03) selectively measures the temperature of the heat generation site. Can. Since the said in-silo temperature measurement method can selectively measure the part which is easy to heat | fever of the filling structure X by S03, it can suppress the increase in the number of the thermometers 4a, such as a thermocouple.

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.

  As described above, the in-silo temperature measurement system and the in-silo temperature measurement method according to the present invention can selectively measure the temperature of the high temperature portion in the silo while suppressing the possibility of heat generation. Suitable for temperature control of

DESCRIPTION OF SYMBOLS 1 Silo 2 Filling structure detection mechanism 3 Heat generation part calculation mechanism 4 Temperature measurement mechanism 4a Thermometer 11 Main body 11a Peripheral wall 11b Bottom wall 12 Roof part 13 Solid fuel inlet 14 Conveyor for solid fuel injection 15 Fuel discharging conveyor 18 muon detecting unit 19 filling structure calculating unit 20, 21 scintillation detector 20a, 21a first detecting unit 20b, 21b second detecting unit F solid fuel X filling structure

Claims (4)

A filling structure detection mechanism for detecting the filling structure of solid fuel stored in a silo by means of muography;
A heat generation site calculation mechanism that calculates a heat generation-prone site in the packing structure detected by the packing structure detection mechanism;
An in-silo temperature measurement system comprising: a temperature measurement mechanism that measures the temperature of a portion calculated by the heat generation portion calculation mechanism.   The in-silo internal temperature measurement system according to claim 1, wherein the heat generation part calculation mechanism calculates a part of the filling structure which is likely to generate heat based on the void distribution of the filling structure. The silo has a bottomed cylindrical body,
The in-silo temperature measurement system according to claim 1 or 2, wherein the filling structure detection mechanism has a plurality of muon detection parts on the side and below the main body. Detecting the filling structure of the solid fuel stored in the silo by muography;
Calculating a heat-prone portion of the packing structure detected in the packing structure detection step;
Measuring the temperature of the portion calculated in the heat generation portion calculating step.

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