JP6722231B2 - Carbide processing apparatus and carbide processing method - Google Patents

Description

The present invention relates to a carbide treatment device and a carbide treatment method.

Organic waste such as sewage sludge is carbonized by, for example, heating and reused as fuel. The carbonized organic waste thus obtained has a highly active surface functional group on the particle surface immediately after carbonization, and is known to have self-heating property as it is (for example, See Patent Document 1). Therefore, in order to ensure safety during storage, a treatment for reducing self-heating property (so-called aging treatment, hereinafter sometimes simply referred to as “carbide treatment”) is performed (for example, from Patent Document 1). See Patent Document 3).

Patent Document 1 describes a method for treating carbides obtained by carbonizing an organic matter-containing sludge generated in wastewater treatment or the like in a carbonization furnace. In this treatment method, the carbide obtained by the carbonization treatment is subjected to an oxidation treatment in a low temperature oxidizing atmosphere furnace to converge the surface oxidation reaction of the carbide in advance. This prevents the stored carbides from inducing combustion by self-heating due to the low temperature oxidation reaction.

Patent Document 2 discloses an organic substance provided with a stabilization treatment furnace that stabilizes a carbonized product after being carbonized in a carbonization furnace by a non-combustion oxidation reaction of active groups having high activity for the oxidation reaction of the carbonized product. A carbonization treatment device for contained sludge is described. In the stabilization treatment furnace of this carbonization treatment device, a temperature range of 60° C. to 200° C. is set in order to carry out stabilization treatment by performing retention for a predetermined time (for example, 10 hours) in the air atmosphere without performing nitrogen purging or the like. It is described therein that an oxidation reaction is carried out.

Patent Document 3 describes a treatment device for carbon-containing material having a heating means for carbonizing or drying the carbon-containing material and a humidifying means for humidifying the heat-treated material from the heating means. This treatment apparatus conveys the humidified heat-treated product by an air flow, temporarily stores the heat-treated substance conveyed by the air flow in a stabilization treatment tank, and aerates the stabilization treatment tank with air or the like. doing. This processing device stabilizes by suppressing latent temperature rise above a certain temperature even if the heat-treated material self-heats during transportation or storage due to latent heat of vaporization of residual water due to humidification.

JP, 2004-267950, A JP, 2004-277464, A JP, 2016-124897, A

However, in these conventional techniques, when performing the carbide treatment, the self-heating of the carbide is still insufficiently controlled and there is room for improvement.

The present invention has been made in view of such circumstances, and an object thereof is to perform a treatment for reducing the self-heating property of carbide while appropriately controlling self-heating during treatment, and a method thereof. To provide.

Characteristic configuration of the carbide processing apparatus according to the present invention to achieve the above object,
A storage tank that accumulates and stores carbide having self-heating properties in layers ,
A ventilation part that vents from the bottom of the deposited layer of the carbide toward the top of the deposited layer,
A temperature measuring unit for measuring the temperature inside the storage tank,
Before Symbol bath temperature by controlling the vent to be less than a predetermined threshold value and a control unit for cooling the carbide,
The ventilation part is
A first ventilation part for supplying a first processing gas containing oxygen,
A second ventilation part for supplying an inert gas as a second processing gas,
The control unit controls at least one of the first processing gas and the second processing gas to cool the carbide .

According to the above configuration, the first treatment gas containing oxygen is passed through the deposits (deposited layer, particle layer) of the carbide stored in the storage tank so that highly active surface functional groups on the surface of the carbide particles are removed. Carbide treatment to oxidize and reduce self-heating. During the treatment of the carbide, the carbide generates heat due to oxidation. Therefore, at the time of the carbide treatment, by aeration of the second treatment gas to the deposit of the carbide as necessary, the oxygen concentration of the treatment gas supplied into the tank is lowered, the rate of the oxidation, That is, the calorific value per unit time is reduced. Further, in order to prevent the heated carbide from causing a risk of ignition, the second processing gas is used for cooling in addition to the cooling by the first processing gas. The inert gas refers to a gas that does not undergo an oxidation reaction even when it comes into contact with highly active surface functional groups on the surface of the carbide particles. Hereinafter, the fact that no oxidation reaction occurs even when contacting with highly active surface functional groups on the surface of the carbide particles may be simply described as “inert”.

Further, according to the above configuration, the temperature measuring unit measures the temperature inside the tank, and controls the temperature inside the tank to be equal to or lower than a predetermined threshold value by at least one of the first processing gas and the second processing gas. The department is in control. For example, by increasing or decreasing at least one of the supply amounts of the first processing gas and the second processing gas, the oxygen concentration of the processing gas supplied into the tank is reduced to reduce the calorific value per unit time. Then, the temperature inside the tank is controlled to be equal to or lower than a predetermined threshold. Further, for example, at least one of the gas temperatures of the first processing gas and the second processing gas is controlled to be equal to or lower than a predetermined threshold value set to a temperature lower than the temperature inside the tank. Thereby, the deposit of carbide can be sufficiently cooled. That is, for example, unevenness in ventilation of the carbide deposits or unevenness in the calorific value of each particle due to variation in surface area due to variation in individual particle shape of the carbides may occur. Even if the oxidation proceeds excessively in the part and the heat is generated locally, it is possible to sufficiently cool it. Therefore, it is possible to realize the treatment for reducing the self-heating property of the carbide while appropriately controlling the self-heating during the oxidation treatment.

Further characteristic configuration of the carbide processing apparatus according to the present invention,
The second processing gas is the exhaust gas from the storage tank.

The oxygen of the first processing gas that has been aerated to the self-heating carbide is consumed by the oxidation treatment of the carbide. Therefore, the oxygen concentration of the exhaust gas from the storage tank becomes low. That is, the exhaust gas having low oxygen is inactive with respect to the highly active surface functional group of the carbide. Therefore, according to the above configuration, the amount of expensive inert gas such as nitrogen used can be reduced, and the exhaust gas from the storage tank can be used as the second processing gas.

Further characteristic configuration of the carbide processing apparatus according to the present invention,
An air supply port provided at the lower end of the storage tank for supplying air to the ventilation section ,
An exhaust port provided at the upper end of the storage tank for exhausting gas that has passed through the deposition layer ,
The second ventilation part, a circulation path that communicates the exhaust port and the air supply port, an exhaust gas blower that blows the exhaust gas from the exhaust port toward the air supply port in the circulation path, And a humidifying section for humidifying the exhaust gas.

According to the above configuration, the second ventilation part can blow the exhaust gas to the circulation path from the exhaust port to the supply port by the exhaust gas blower, and vent the exhaust gas to the carbide deposit. That is, the exhaust gas can be circulated from the exhaust port to the supply port and effectively used as the second processing gas.

Further, when the exhaust gas is used as the second processing gas, it is possible to prevent the carbide from drying by humidifying the exhaust gas, that is, the second processing gas, and prevent a rapid temperature rise of the carbide. it can. That is, by increasing the atmospheric humidity in the storage tank and maintaining the state in which the carbide contains water, it is possible to reduce the ignitability of the carbide. By maintaining the state in which the carbide contains water, it is possible to prevent a rapid temperature rise and ignition due to the latent heat of vaporization of the water even when the heat generation rate of the carbide increases. As a result, it is possible to improve the safety in treating the carbide.

Further characteristic configuration of the carbide processing apparatus according to the present invention,
The temperature measuring unit has a plurality of temperature sensors,
Each of the plurality of temperature sensors is installed at different height positions in the storage tank,
The control unit controls at least one of the gas temperatures of the first processing gas and the second processing gas to be a temperature lower than the highest in-vessel temperature detected by the temperature sensor. There is a point.

As mentioned above, the carbide deposits may locally generate heat. On the other hand, in the carbide treatment, if the treatment temperature is too low, the treatment speed may decrease, and even if the treatment is performed for a predetermined retention time, the self-heating property of the carbide may not be sufficiently reduced. Further, if the residence time is lengthened in order to sufficiently reduce the self-heating property of the carbide even at a low treatment temperature, the production efficiency is lowered. Therefore, excessive cooling of the carbide deposit is not desirable. However, according to the above configuration, at least one of the gas temperatures of the first processing gas and the second processing gas is controlled to be a temperature lower than the highest tank temperature detected by the temperature sensor. Thus, it is possible to prevent excessive temperature rise and excessive cooling, and realize carbide treatment with high production efficiency.

Further characteristic configuration of the carbide processing apparatus according to the present invention,
The controller is to increase the ratio of the supply rate of the second processing gas to the supply rate of the first processing gas in order to reduce the temperature in the bath.

According to the above configuration, when the temperature inside the tank approaches the predetermined threshold value and it becomes necessary to lower the temperature inside the tank, the control unit controls the supply speed of the second processing gas with respect to the supply speed of the first processing gas. Control is performed to increase the ratio to reduce the oxygen concentration of the processing gas supplied into the tank. As a result, the rate of oxidation can be reduced and the temperature inside the bath can be lowered.

Further characteristic configuration of the carbide processing apparatus according to the present invention,
The first aeration section has a second humidification section for humidifying the first processing gas.

According to the above configuration, as in the case of humidifying the second processing gas, it is possible to prevent the carbide from drying by humidifying the first processing gas, and it is possible to prevent a rapid temperature increase of the carbide. It becomes possible to improve the safety of carbide treatment.

Characteristic configuration of the carbide treatment method according to the present invention to achieve the above object,
A storage step of depositing and storing a carbide having self-heating properties in a storage tank in a layered manner ,
An aeration step of ventilating from the lower part of the carbide deposition layer toward the upper part of the deposition layer;
A temperature measuring step of measuring the temperature inside the storage tank,
Before Symbol bath temperature is controlled to be below a predetermined threshold value and a temperature control step of cooling the carbide,
The aeration step,
A first venting step of venting a first processing gas containing oxygen;
A second ventilation step of ventilating an inert gas as a second processing gas,
The temperature control step is to control at least one of the first processing gas and the second processing gas to cool the carbide .

According to the above-mentioned composition, the same operation effect as the above-mentioned carbide processing equipment can be acquired.

It is possible to provide a carbide treatment device and a method for performing treatment for reducing the self-heating property of carbide while appropriately controlling self-heating during treatment.

Configuration diagram of the organic sludge recycling system of the first embodiment Explanatory drawing of the carbide processing apparatus of 1st embodiment The figure explaining the installation mode of a temperature sensor The figure explaining the installation aspect of an oxygen probe Configuration diagram of the organic sludge recycling system of the second embodiment Explanatory drawing of the carbide processing apparatus of 3rd embodiment

A carbide treatment apparatus and a carbide treatment method according to an embodiment of the present invention will be described based on FIGS. 1 to 6.

[First embodiment]
[Explanation of overall configuration]
A carbide processing apparatus 100 according to the first embodiment will be described based on FIGS. 1 to 4. As shown in FIG. 1, the carbide treatment device 100 according to the first embodiment is used for carbide treatment of an organic sludge recycling system 200 that reuses organic sludge such as sewage sludge as a recycled fuel F, for example. In the present embodiment, an example is described in which the organic sludge recycling system 200 is supplied with the dried sludge L which is an organic sludge that has been dried and granulated in advance. The organic sludge recycling system 200 obtains recycled fuel F by carbonizing the dried sludge L or the like.

As shown in FIG. 2, the carbide treatment device 100 reduces the self-heating property of the carbide M obtained from the dried sludge L by a carbide treatment method described later (so-called aging treatment (low temperature oxidation treatment), hereinafter, (Referred to as "carbide treatment").

The organic sludge recycling system 200 mainly includes a carbonization furnace 10, a cooler 20, and a stock tank 27 in addition to the carbide treatment device 100.

The dried sludge L is granulated into a cylindrical pellet shape by, for example, an extrusion granulation method. The physical properties such as the particle shape and bulk density of the dried sludge L or the carbide M obtained from the dried sludge L and the recycled fuel F are homogenized, and the handling property and the carbide of the carbide M and the like in the organic sludge recycling system 200 and the carbide treatment device 100 are obtained. This is to improve the uniformity of processing.

As shown in FIG. 1, the dried sludge L is supplied to the carbonization furnace 10 and carbonized. As a result, a cylindrical pellet-shaped carbide M is obtained. The carbide M discharged from the carbonization furnace 10 is humidified and cooled by the cooler 20. Then, it is stored in the carbide processing apparatus 100 for a predetermined time. The carbide processing apparatus 100 ventilates the stored carbide M with a processing gas G containing oxygen for a predetermined time to perform the carbide processing (see FIG. 2 ). The carbide M that has been subjected to the carbide treatment becomes a recycled fuel F that can be safely stored in a tank or the like, and is discharged from the carbide treatment device 100. The recycled fuel F discharged from the carbide processing apparatus 100 is stored in the stock tank 27 for shipment to the market. Below, the downstream side of the transport route of the carbide M or the recycled fuel F from the carbonization furnace 10 to the stock tank 27 is simply referred to as the downstream side, and the opposite is referred to as the upstream side.

[Explanation of each part]
The carbonization furnace 10 is a device that obtains a carbide M by heating the dry sludge L in a low oxygen atmosphere (hereinafter, may be referred to as “carbonization treatment”). The carbonization furnace 10 is composed of a rotary kiln. The carbonization furnace 10 may be a fluidized bed type, a screw type or the like in addition to the rotary kiln type. The carbonization furnace 10 carbonizes the dried sludge L at a temperature of about 250 to 600°C.

In the carbonization furnace 10 in the present embodiment, combustible gas is generated from the dried sludge L during the carbonization process. The combustible gas is supplied to, for example, the secondary combustion furnace 12 and burned, and then discharged to the outside as combustion exhaust gas Ef through the exhaust gas treatment facility 13 such as an exhaust heat recovery machine and a scrubber. The carbide M is discharged from the carbonization furnace 10 and then charged into the cooler 20 via the chute 11 and the like.

The cooler 20 is a device that cools the carbide M. In the present embodiment, the cooler 20 is a device in which a nozzle 20E that supplies the cooling water CW is attached to a screw transport device that moves the carbide M by a screw provided in the casing. In the present embodiment, the cooler 20 conveys the carbide M in one direction with a screw, and sprays the cooling water CW to the conveyed carbide M.

The carbide M inside the cooler 20 is cooled by the latent heat of vaporization of the cooling water CW. In this embodiment, the carbide M is rapidly cooled to less than 60°C. In the present embodiment, the carbide M is cooled and humidified by the spray supply of the cooling water CW. In this embodiment, the carbide M is humidified to have a water content of 5% to 20%, particularly preferably 7% to 15% on a dry basis (weight ratio based on the weight of completely dried carbide).

In the present embodiment, the cooler 20 has a carrier gas CG, which is an inert gas such as nitrogen, flowing in a direction opposite to the flow of the carbide M. In the cooler 20, in addition to the carrier gas CG and the steam of the cooling water CW, flammable gas such as carbon monoxide gas and gas having odor are generated. Therefore, in the present embodiment, the exhaust gas of the cooler 20 is introduced into the secondary combustion furnace 12 via the exhaust pipe 14. The cooled carbide M is supplied from the cooler 20 to the flight conveyor 22. In the present embodiment, the carbide M is supplied to the flight conveyor 22 via the rotary valve 21 that partitions the cooler 20 and the charging port (not shown) of the flight conveyor 22.

The carbide M discharged from the cooler 20 is conveyed to the cushion tank 23 by the flight conveyor 22 and is supplied from the cushion tank 23 to the carbide processing device 100. In the present embodiment, the carbide M transported to the cushion tank 23 is supplied to the carbide processing apparatus 100 via the rotary valve 31a (see FIG. 2). Instead of using the flight conveyor 22 or the like, the carbide M discharged from the cooler 20 may be supplied to the carbide processing apparatus 100 via a chute or the like. Further, instead of being carried by the flight conveyor 22, it may be carried by air transportation, a belt conveyor, a bucket conveyor, or the like.

The carbide processing apparatus 100 is an apparatus that processes the carbide M to obtain a recycled fuel F. The carbide processing apparatus 100 will be described later. The recycled fuel F obtained in the carbide processing apparatus 100 is transported from the flight conveyor 25 to the cushion tank 26. At this time, an air cooling device 25a such as a heat exchanger to which the refrigerant is supplied from the chiller is arranged upstream of the flight conveyor 25, and the recycled fuel F is cooled using the air A cooled by the air cooling device 25a. There is a case. The recycled fuel F is put into the stock tank 27 from the cushion tank 26 and stored until shipping.

The carbide processing apparatus 100 will be described in detail. As shown in FIG. 2, the carbide processing apparatus 100 ventilates (feeds) the processing gas G to the storage tank 3 that stores the carbide M and performs the carbide processing, and the deposit B of the carbide M stored in the storage tank 3. Aeration section 4 that measures the temperature inside the storage tank 3, an oxygen concentration measurement unit S that measures the oxygen concentration inside the storage tank 3, and the overall operation of the carbide processing apparatus 100. And a control unit 9 for controlling the. As will be described later, the processing gas G is a gas containing at least the first processing gas G1 containing oxygen such as air A. In the present embodiment, the ventilation part 4 supplies the processing gas G in which the first processing gas G1 and the second processing gas G2 are mixed. In the present embodiment, the ventilation part 4 includes an air supply fan 41 and a circulation fan 42. The temperature inside the storage tank 3 is a value obtained by measuring the temperature of the deposit B.

As will be described later, the carbide processing apparatus 100 stores a carbide M in the storage tank 3, an aeration step of aerating the deposit B of the carbide M with a processing gas G containing oxygen, and a predetermined amount of the carbide M. Carrying out the carbide M for the carbide M is performed by carrying out the discharging step of retaining and discharging for a time, and the recycled fuel F is obtained.

As will be described later, the carbide processing apparatus 100 ensures that the safety of the recycled fuel F (low self-heating property) and the safety of the carbide processing by the carbide processing apparatus 100 are ensured so that the temperature inside the tank 3 of the storage tank 3 can be ensured. In addition to the temperature measurement step for measuring the temperature, a first aeration step of aerating the deposit B of the carbide M with the first processing gas G1 and a second aeration step of venting the deposit B with the second processing gas G2. Two ventilation steps are performed. Further, the carbide processing apparatus 100 controls the temperature inside the storage tank 3 to be equal to or lower than a predetermined threshold value (temperature) by using at least one of the first processing gas G1 and the second processing gas G2. Execute the control process. Further, the carbide processing apparatus 100 sets a determination threshold value setting step for setting a determination threshold value for each of a plurality of layer areas in the layer height direction of the deposit B, and the ventilation amount in the ventilation step based on the determination threshold value in the layer area. Or a control step of controlling the residence time in the discharging step.

The storage tank 3 is a metal container that accumulates the carbide M in the vertical direction and stores it in layers. The storage tank 3 is a supply container that supplies (discharges by mass flow) the carbide M stored in the layered state to the next step while maintaining the layered state. The storage tank 3 has a supply unit 31 that serves as an input port for charging the carbide M into the internal space of the container body 30 of the storage tank 3, and a discharge unit 32 that discharges the recycled fuel F from the internal space of the storage tank 3.

The container body 30 of the storage tank 3 of the present embodiment includes a cylindrical upper container having a top plate 30a that closes the upper end, and a lower container that narrows downward from the upper container into a mortar shape (cone shape). It is equipped with. The cross-sectional shape of the storage tank 3 is circular, and the angle (cone angle) at which the lower container is narrowed is set to the angle at which the carbide M (recycled fuel F) is discharged from the discharge portion 32 by mass flow. If the angle at which the lower container is narrowed cannot be set to the angle at which the mass flow is discharged, for example, in the vicinity of the boundary between the upper container and the lower container in the tank of the storage tank 3, and in the radial center of the storage tank 3. A Jinkasa-shaped baffle (so-called cone baffle) may be provided in the vicinity.

The storage tank 3 has a supply unit 31 at the upper end of the container body 30. The supply unit 31 is provided on a top plate 30a on the upper surface of the container which is the upper end of the container body 30 of the storage tank 3, and includes a supply pipe connected to the internal space of the storage tank 3 and a rotary valve 31a provided on the supply pipe. Have. The storage tank 3 can charge the carbide M into the internal space in a state of being cut off from the atmosphere on the upstream side by the rotary valve 31a. In the present embodiment, the carbide M is continuously supplied to the supply unit 31 at a constant supply rate.

The storage tank 3 has a discharge part 32 at the lower end of the container body 30. The discharge part 32 is provided at the end 30b of the lower container, which is the lower end of the container body 30 of the storage tank 3. It has a discharge pipe 32b connected to the internal space of the storage tank 3 and a rotary valve 32a as a discharge device for the carbide M (recycled fuel F) provided in the discharge pipe 32b.

The discharge pipe 32b is a cylindrical pipe in the present embodiment, and is provided downward from the end portion 30b of the lower container. The storage tank 3 can discharge the recycled fuel F from the internal space of the storage tank 3 to the lower side of the storage tank 3 by the rotary valve 32a while being cut off from the atmosphere on the downstream side. In the present embodiment, the recycled fuel F is continuously discharged from the discharge part 32.

In the present embodiment, as described above, the carbide M is continuously charged into the storage tank 3 at a constant supply rate, and the recycled fuel F is continuously discharged from the storage tank 3. The average retention time of the carbide M (recycled fuel F) in the storage tank 3 is controlled to be, for example, 2 days (48 hours). The residence time is set to a necessary and sufficient length for obtaining the recycled fuel F from the carbide M. If the residence time is too short, the self-heating property of the carbide M cannot be sufficiently reduced, and the safety of the recycled fuel F cannot be guaranteed. If the residence time is too long, the production efficiency of the recycled fuel F decreases, which is uneconomical, which is not preferable.

The storage tank 3 has a gas supply port 34 (an example of an air supply port) at the lower end portion for introducing the processing gas G into the internal space and supplying the processing gas G containing oxygen to the deposit B. The gas supply port 34 is connected to the upstream side of the rotary valve 32a (inner space side of the storage tank 3) in the exhaust pipe 32b of the exhaust unit 32. As a result, the processing gas G supplied from the gas supply port 34 is aerated to the particle layer of the deposit B from the end portion 30b at the lower end of the lower container of the storage tank 3. The processing gas G makes solid-gas contact with the particle surface of the carbide M while passing through the particle layer of the deposit B, and oxidizes the surface functional groups and the like on the particle surface.

The exhaust gas E (processing gas G) that has passed through the particle layer of the deposit B is exhausted to the outside as exhaust gas E from an exhaust pipe 33 (an example of an exhaust port) provided at the upper end of the storage tank 3. The exhaust gas E is introduced into the secondary combustion furnace 12 (see FIG. 1) and the like to be purified and then discharged into the atmosphere.

In the present embodiment, the oxygen contained in the processing gas G is supplied to the deposit B under the condition that the oxygen is almost consumed by the deposit B. Here, the condition that the oxygen contained in the processing gas G is almost completely consumed by the deposit B means that the oxygen in the exhaust gas E is consumed until the oxygen concentration becomes approximately 0%, but the exhaust gas E becomes completely 0%. This means that oxygen is left in the exhaust gas E so that the oxidation reaction proceeds even in the upper part of the deposit B. Therefore, the exhaust gas E is mainly composed of nitrogen and carbon dioxide. As described above, since the exhaust gas E is substantially oxygen-free in this embodiment, the exhaust gas E does not accelerate the oxidation reaction even when it comes into contact with the highly active surface functional group on the surface of the carbide particles.

The storage tank 3 is attached with temperature sensors T1 to T5 (hereinafter, the temperature sensors T1 to T5 may be collectively referred to simply as “temperature sensors”) that are sensor probes of the temperature measuring unit T. .. In the present embodiment, the temperature sensor is a rod-shaped sensor probe having a temperature detecting portion (hereinafter, simply referred to as “sensor tip”) at its tip, and uses a resistance temperature detector. A thermocouple or another sensor may be used as the temperature sensor.

The temperature sensor is installed on the wall of the storage tank 3. The temperature sensor has a rod-shaped sensor probe penetrating the wall of the container body 30 from the outside of the side surface of the storage tank 3, and the tip of the sensor is arranged inside the tank of the storage tank 3 in the radial direction of the container body 30. It is attached along the. As shown in FIG. 2, the temperature sensors are attached to the storage tank 3 in the order of the temperature sensor T1 to the temperature sensor T5 from the lower side (downstream side) to the upper side (upstream side) of the storage tank 3. The temperature sensor is not limited to the case where it is attached along the radial direction of the container body 30, and may be attached while being inclined upward or downward in the vertical direction from the direction along the radial direction of the container body 30. You may incline and attach from the direction along a direction to the direction along the circumferential direction of the container main body 30. Further, the mounting method of the temperature sensor is not limited to the method of penetrating the wall portion, and may be mounted so as to hang from the top plate 30a, for example.

The temperature sensor T1 is provided upstream of the rotary valve 32a in the discharge pipe 32b of the discharge unit 32, and the tip of the sensor is inserted into the center of the discharge pipe 32b in the radial direction of the pipe.

The temperature sensor T2 is inserted from the wall portion of the lower part of the upper container of the storage tank 3 toward the inside of the tank. In the present embodiment, the temperature sensor T2 is provided at a position slightly above the connecting portion between the upper container and the lower container. The temperature sensors T3 to T5 are inserted from the wall of the upper container of the storage tank 3 toward the inside of the tank. In the present embodiment, the temperature sensors T2 to T5 each include three sensor probes.

The temperature sensors T3 are provided at the same height position on the wall portion of the storage tank 3, for example, as shown in FIG. 3, at equal intervals, respectively, in a clockwise direction when viewed from above the storage tank 3, the temperature sensor T31 and the temperature sensor T32. , Temperature sensor T33. The values measured by these temperature sensors T31 to T33 are averaged to obtain the measured value of the temperature sensor T3. The temperature sensor T3 may be any one of the temperature sensors T31 to T33, or a combination of any two of the temperature sensors T31 to T33. Further, the highest value among the values measured by the temperature sensors T31 to T33 may be used as the measurement value of the temperature sensor T3, instead of the average value of the values measured by the temperature sensors T31 to T33.

In the temperature sensor T31, the tip of the sensor is inserted to the depth of the central portion in the radial direction of the storage tank 3. In the temperature sensor T32, the tip of the sensor is inserted to a depth between the wall of the storage tank 3 and the radial center of the storage tank 3. In the temperature sensor T33, the tip of the sensor is inserted to a depth slightly inside the wall of the storage tank 3. In the present embodiment, the temperature sensors T31 to T33 have different insertion depths, but the insertion depths may be the same.

Although the mounting heights of the temperature sensor T2, the temperature sensor T4, and the temperature sensor T5 are different, the mounting mode is the same as that of the temperature sensor T3, and thus the description thereof is omitted.

As shown in FIG. 2, in the storage tank 3, suction pipes S1 to S5 that are air sampling nozzles of the oxygen concentration measuring unit S (hereinafter, the suction pipes S1 to S5 are collectively referred to simply as “oxygen probe”). May be installed). The suction pipes S2 to S5 are provided along the radial direction of the container body 30 with a pipe connected to an oxygen concentration meter (not shown) penetrating the wall of the container body 30 from the outside of the side surface of the storage tank 3. .. In the suction tubes S2 to S5, the tips of the tubes are arranged in the central portion of the container body 30 in the radial direction. The suction pipe S1 is provided upstream of the rotary valve 32a in the discharge pipe 32b of the discharge unit 32 along the radial direction of the discharge pipe 32b. The suction pipe S1 has a distal end of the pipe arranged in a central portion of the discharge pipe 32b in the radial direction of the pipe. As described above, the oxygen probe is attached so that the gas in the storage tank 3 can be sucked by the pipe and the oxygen concentration can be measured by the oxygen concentration meter. The oxygen probe is attached to the storage tank 3 in the order of the suction pipes S1 to S5 from the lower side (downstream side) to the upper side (upstream side) of the storage tank 3. FIG. 4 illustrates an example of how the suction tube S3 is attached. The same applies to the manner of attaching the oxygen probe other than the suction tube S3. As in the case of the temperature sensor, the oxygen probe may be attached so as to be tilted upward or downward in the vertical direction or along the circumferential direction.

In the present embodiment, the exhaust pipe 33 is provided on the top plate 30a of the storage tank 3 as shown in FIG. The exhaust pipe 33 is provided with a resistor 33a serving as a resistance to the flow of the exhaust gas E so as to maintain the internal space of the storage tank 3 at a positive pressure. As the resistor 33a, for example, a valve device such as a butterfly valve whose opening can be adjusted can be used. The resistance of the exhaust gas E to flow can be changed by changing the opening degree of the resistor 33a. When the resistance of the flow of the exhaust gas E is increased, the pressure in the internal space of the storage tank 3 changes to the positive pressure side. By maintaining the pressure of the internal space of the storage tank 3 on the positive pressure side, the gas containing oxygen is prevented from flowing (invading) into the internal space of the storage tank 3 from other than the gas supply port 34. That is, by preventing the invasion into the internal space of the storage tank 3, the carbide M is locally heated and ignited due to the intrusion.

The processing gas G is a gas containing at least the first processing gas G1 containing oxygen such as air A. In the present embodiment, the processing gas G is a gas in which the first processing gas G1 and the second processing gas G2 obtained by recycling the substantially oxygen-free exhaust gas E are mixed. Therefore, the oxygen concentration of the processing gas G is determined by the mixing ratio of the first processing gas G1 and the second processing gas G2. The oxygen concentration of the processing gas G decreases as the mixing ratio of the second processing gas G2 increases.

The first processing gas G1 sucks the air A (outside air) by the air supply fan 41 (an example of a first ventilation part), and is connected to the gas supply port 34 by an air supply pipe 41a (an example of a first ventilation part). It is supplied to the storage tank 3 by blowing air (supplying air).

The first processing gas G1 is a carrier gas that supplies oxygen to the carbide M in the present embodiment. The first processing gas G1 is a refrigerant that cools the carbide M. Oxidation of the carbide M progresses according to the aeration amount of the first processing gas G1, that is, according to the oxygen supply amount. The carbide M generates heat in response to this oxidation. When the supply amount of the first processing gas G1 is increased, that is, when the oxygen supply rate is increased, the oxidation rate (processing rate) of the carbide M becomes faster. As a result, the calorific value of the carbide M per unit time increases, and the temperature of the deposit B, that is, the temperature inside the storage tank 3 rises.

The second processing gas G2 blows a portion (exhaust air supply) of the exhaust gas E to the gas supply port 34 via a circulation path 40 (an example of a second ventilation part) that connects the exhaust pipe 33 and the gas supply port 34. ) Is carried out and it is supplied to the storage tank 3. The total amount of the exhaust gas E exhausted from the exhaust pipe 33 does not change even if the supply amount of the second processing gas G2 is increased or decreased. This is because the second processing gas G2 simply circulates in the storage tank 3.

The second processing gas G2 is a gas inert to the carbide M. The second processing gas G2 is a refrigerant that cools the carbide M. By supplying the second processing gas G2, the oxygen concentration of the processing gas G is reduced to reduce the reaction rate of the oxidation reaction of the carbide M. This can prevent the carbide M from locally generating heat in the storage tank 3. Further, in addition to the cooling by the first processing gas G1, the carbide M (deposit B) can be cooled by supplying the second processing gas G2.

The circulation path 40 is provided with a circulation fan 42 (an example of a second ventilation section, an example of an exhaust gas blower) and a humidifier 45 (an example of a humidification section). The circulation path 40 includes a pipe 40a for guiding the exhaust gas E from the exhaust pipe 33 to the circulation fan 42, a pipe 40b for guiding the exhaust gas E from the circulation fan 42 to the humidifier 45, and an exhaust gas from the humidifier 45 to the gas supply port 34. And a pipe 40c for guiding E.

The circulation fan 42 is a blower that allows the exhaust gas E, which is the second processing gas G2, to flow in the circulation path 40 from the exhaust pipe 33 toward the gas supply port 34. The circulation fan 42 may be a blower, a fan, or the like.

The humidifier 45 is a device that has a nozzle 45a and sprays the humidifying water W onto the second processing gas G2 to humidify the second processing gas G2. In addition, although the case where the second processing gas G2 is humidified has been described in the present embodiment, the first processing gas G1 may also be humidified together. In the humidifier 45, the second processing gas G2 is cooled by the sensible heat of the humidifying water W and the latent heat of vaporization of the humidifying water W.

The control unit 9 will be described. The control unit 9 is a central control mechanism that controls the overall operation of the carbide processing apparatus 100. The control unit 9 can be configured by, for example, a software program for realizing various processes, a CPU that executes the software program, various hardware controlled by the CPU, and the like. In this embodiment, the control unit 9 is a computer including a CPU and an input/output circuit. Programs, data, and control parameters required for the operation of the control unit 9 are stored in a storage unit (not shown) in this embodiment. The program and the data storage destination are not particularly limited. These programs and data may be stored in a storage device such as a disk or a flash memory that is separately provided for exclusive use. Further, it may be an external server or a storage unit that is communicatively connected.

The control unit 9 executes a program stored in the storage unit to set a judgment threshold value setting unit 99 that sets a judgment threshold value for the control unit 9 to perform control, and a ventilation control that controls the ventilation unit 4 based on the judgment threshold value. Section 91, a temperature control section 92 that controls the ventilation temperature of the ventilation section 4 and the temperature inside the storage tank 3 based on the determination threshold value, and a retention time control section that controls the retention time of the deposit B based on the determination threshold value. And 93 are realized by software.

The determination threshold setting unit 99 sets the oxygen consumption characteristic of the carbide M and the determination threshold based on the oxygen consumption characteristic for each of the plurality of layer regions in the tank height direction of the deposit B, and the control unit 9 makes this determination. The control described later is performed based on the threshold value. Further, the determination threshold value setting unit 99 acquires the temperature inside the storage tank 3 from the temperature measuring unit T and sets a supply air upper limit temperature (an example of a predetermined threshold value) described later.

A plurality of layer regions will be described. In the present embodiment, the above-mentioned plurality of layer regions are the deposited layer B1, the deposited layer B2, and the deposited layer B3 shown in FIG. In the following, when the deposited layer B1, the deposited layer B2, and the deposited layer B3 are comprehensively described as the particle layers of the deposit B, they are simply referred to as “layer regions”.

In the present embodiment, the determination threshold setting unit 99, as the above-mentioned layer region, sequentially from the lower side (downstream) to the upper side (upstream) of the deposit B in the storage tank 3, the deposition layer B1, the deposition layer B2, and the deposition layer B3. Is virtually determined. In this embodiment, the volume of each layer region is set to be equal. The volume of each layer region may be set differently.

The deposition layer B1 is a layer including the bottom of the storage tank 3 in the tank to a range that covers the temperature sensor T2 and the suction pipe S2 shown in FIG. The deposition layer B2 is an upper layer (upstream layer) of the deposition layer B1 and is a layer including up to the extent of covering the temperature sensor T3 and the suction pipe S3 shown in FIG. The deposition layer B3 is an upper layer of the deposition layer B2, and is a layer including up to a range of covering the temperature sensor T4 and the suction pipe S4 shown in FIG. In this embodiment, the temperature sensor T5 and the suction pipe S5 are not covered with the deposit B, but are in contact with the exhaust gas E passing through the deposit B.

The oxygen consumption characteristics will be described. The oxygen consumption characteristic is a mass of oxygen consumed by the carbide M per unit mass per unit time. The oxygen consumption characteristic means the degree of activity (activity that is oxidized by oxygen) of the carbide M in the storage tank 3. As the oxygen consumption characteristic increases, the carbide M generates heat in an oxygen-containing atmosphere, and the risk of ignition increases. Therefore, in order to use the carbide M as the recycled fuel F, it is required to reduce the oxygen consumption characteristic to a predetermined value or less.

The determination threshold setting unit 99 calculates the oxygen consumption characteristic for each layer region. It should be noted that the phrase “obtaining the oxygen consumption characteristic for each layer region” in the present embodiment means obtaining the oxygen consumption characteristic for at least one specific layer region (for example, the deposited layer B1). It includes obtaining oxygen consumption characteristics for each of the above layer regions (for example, the deposited layers B1 to B3).

The oxygen consumption characteristic can be determined by the mass of each layer, the amount of oxygen supplied to each layer region, and the amount of oxygen discharged from each layer region. In the present embodiment, since the volume of each layer region is set to be constant, the oxygen consumption characteristic of each layer region is determined from the oxygen concentration contained in the processing gas G supplied to each layer region, and the oxygen consumption characteristic is discharged from each layer region. It is possible to obtain a value that is proportional to a value obtained by multiplying the difference obtained by subtracting the oxygen concentration contained in the processing gas G by the ventilation speed that is the ventilation rate of the processing gas G per unit time. As the oxygen concentration contained in the processing gas G supplied to the layer region and the oxygen concentration contained in the processing gas G discharged from the layer region, the oxygen concentration measured by the oxygen concentration measuring unit S may be used. For example, the oxygen consumption characteristic of the deposited layer B2 is obtained as a value proportional to a value obtained by multiplying the difference in oxygen concentration measured by the suction pipe S2 from the oxygen concentration measured by the suction pipe S3 by the ventilation speed. Hereinafter, the oxygen consumption characteristic and the value proportional to the oxygen consumption characteristic are collectively referred to as “oxygen characteristic value”.

The determination threshold setting unit 99 obtains (calculates) the determination threshold for each layer region from the oxygen characteristic value for each layer region. The determination threshold value is obtained with the goal that the oxygen characteristic value of the carbide M in each layer region is equal to or less than the oxygen characteristic value required for the recycled fuel F. As the determination threshold value in the present embodiment, for example, the minimum residence time, the minimum remaining aeration amount, the maximum oxygen supply rate, etc. can be enumerated for each layer region. In this embodiment, a fixed initial value is set in advance as the determination threshold value, and when the oxygen characteristic value is calculated in each layer region, the initial value or the determination threshold value calculated immediately before is updated. There is.

The minimum residence time will be described. The minimum residence time is at least the remaining processing time required for the recycled fuel F (carbide processing) that can safely store the carbide M even if it contacts the outside air atmosphere. In this embodiment, 2 days (48 hours) is set as the initial value. The minimum residence time means the minimum processing time required after the time when the oxygen characteristic value is obtained. The minimum residence time is increased when the oxygen characteristic value is large. Shorten when the ventilation speed of the processing gas G is high. Further, the shorter the oxygen concentration contained in the processing gas G, the shorter the oxygen concentration. For example, when the aeration state (ventilation speed and oxygen concentration) of the processing gas G is temporarily maintained, the minimum residence time is approximately proportional to the magnitude of the oxygen characteristic value.

The minimum remaining ventilation amount will be described. The minimum residual air flow rate is at least the residual air flow rate required for making the recycled fuel F (carrying carbide processing) that can safely store the carbide M even if it contacts the outside air atmosphere. The minimum remaining air flow rate means the minimum air flow rate required after the time when the oxygen characteristic value is obtained. Unlike the minimum residence time, the minimum residual aeration amount is increased when the oxygen characteristic value is large. It does not depend so much on the size of the ventilation speed of the processing gas G. Similar to the minimum residence time, the minimum residual gas flow rate is set to a smaller value as the oxygen concentration contained in the processing gas G increases. For example, when the oxygen concentration of the processing gas G is maintained, the minimum remaining ventilation amount is made approximately proportional to the magnitude of the oxygen characteristic value.

The maximum oxygen supply rate will be described. The maximum oxygen supply rate is a value that determines the maximum heat generation amount per unit time (hereinafter sometimes simply referred to as heat generation amount) allowed in each layer region when the oxygen characteristic value is obtained. Here, the oxygen supply rate is a value derived based on the gas permeation amount of the processing gas G and the oxygen concentration of the processing gas G. The calorific value of each layer region is approximately proportional to the amount of oxygen consumed in each layer region. Therefore, by defining the maximum oxygen supply rate to be supplied to each layer region, the calorific value of each layer region can be limited to a predetermined value or less. As a result, it is possible to avoid the risk of ignition of the carbide M in the carbide treatment process.

The maximum oxygen supply rate is when the calorific value of each layer region per unit time, which is derived based on the amount of oxygen supplied to each layer region and the oxygen characteristic value, exceeds the cooling capacity of each layer region by the processing gas G. The maximum calorific value of each layer region per unit time is determined to be equal to or less than the cooling capacity of each layer region by the processing gas G.

The temperature controller 92 will be described. The temperature control unit 92 is a functional unit that controls the gas temperature of the processing gas G (only the first processing gas G1 or a mixture of the first processing gas G1 and the second processing gas G2). The temperature control unit 92 controls the gas temperature of the processing gas G to be equal to or lower than the supply air upper limit temperature set to a temperature lower than the temperature inside the storage tank 3.

Further, the temperature control unit 92 determines that the highest temperature (hereinafter, simply referred to as “maximum temperature”) of the tank internal temperatures of the storage tank 3 detected by the temperature sensor is a predetermined threshold value (hereinafter, “layer temperature upper limit”). The temperature of the processing gas G is controlled so as to be less than "." In this embodiment, as described above, the deposition layer B1 corresponds to the temperature sensor T2, the deposition layer B2 corresponds to the temperature sensor T3, and the deposition layer B3 corresponds to the temperature sensor T4. Therefore, the temperature control unit 92 controls the temperature of the processing gas G so that the temperature of the highest temperature layer region (the highest temperature measured by the temperature sensors T2 to T4) is less than the upper limit of the layer temperature. There is.

The supply air upper limit temperature will be described. The supply air upper limit temperature is a threshold value set as an upper limit of the gas temperature of the processing gas G. The determination threshold value setting unit 99 acquires the temperature information detected by the temperature sensor from the temperature measurement unit T, and sets the temperature lower than the maximum temperature among the tank internal temperatures of the storage tank 3 detected by the temperature sensor as the supply upper limit temperature. Set. In the present embodiment, the supply air upper limit temperature is set to a temperature lower than the maximum temperature and less than 60°C.

The upper limit of the layer temperature is set to be less than 60°C. That is, the temperature control unit 92 controls the temperature of the processing gas G and the like so that the maximum temperature becomes less than 60°C. As a result, it is possible to prevent the carbide M from being ignited due to the unevenness of the air flow of the processing gas G and the quality of the carbide M.

The supply air upper limit temperature is set at least below the layer temperature upper limit. The supply air upper limit temperature is set to less than 55°C, for example. Further, the supply air upper limit temperature is set to a temperature lower than the highest in-tank temperature of the storage tank 3 detected by the temperature sensor. This prevents the danger that the carbide M will be ignited due to the temperature of the processing gas G or the like or the fluctuation of the temperature control.

As shown in FIG. 2, in the present embodiment, since the first processing gas G1 directly sucks the outside air, the temperature of the first processing gas G1 is usually equal to or lower than the supply air upper limit temperature. The second processing gas G2 is cooled by the humidifier 45. That is, the temperature control unit 92 increases or decreases the supply amount of the humidifying water W supplied to the second processing gas G2 by the humidifier 45, or increases or decreases the temperature of the humidifying water W, for example. It is possible to control the temperature of the processing gas G2, and thus the processing gas G. For example, when it is desired to decrease the temperature of the processing gas G, the humidifier 45 may increase the supply amount of the humidifying water W to be supplied to the second processing gas G2 or reduce the temperature of the humidifying water W. .. When it is desired to adjust the temperature of the first processing gas G1, a heat exchanger or the like may be provided in the air supply pipe 41a.

The ventilation controller 91 will be described. The ventilation control unit 91 is a functional unit that controls the ventilation unit 4 to control the ventilation amount of the first processing gas G1 and/or the second processing gas G2. The ventilation controller 91 first performs control for adjusting the above-described maximum oxygen supply rate. The maximum oxygen supply speed is adjusted by the ventilation control unit 91 controlling the air supply fan 41 to adjust the ventilation speed of the first processing gas G1. Further, on the assumption that the maximum oxygen supply rate is maintained, the ventilation control unit 91 sets the ventilation rate of the first processing gas G1 and/or the second processing gas G2 within the tank temperature of the storage tank 3. , Control so that the maximum temperature is less than the upper limit of the layer temperature.

In the present embodiment, when the maximum temperature of the storage tank 3 approaches the bed temperature upper limit and it becomes necessary to lower the internal temperature of the tank, the ventilation control unit 91 performs control to increase the ventilation speed of the second processing gas G2. To do. As a result, the ventilation speed of the processing gas G is increased and the deposit B can be cooled.

Further, the ventilation control unit 91 lowers the oxygen concentration while keeping the total amount of oxygen in the processing gas G constant by controlling to increase the ratio of the supply rate of the second processing gas G2 to the supply rate of the first processing gas G1. By doing so, the maximum oxidation reaction rate of the carbide M in the storage tank 3 can be reduced, and the maximum temperature of the storage tank 3 can be reduced. In this case, since the total amount of oxygen in the processing gas G is constant, the average oxidation rate of the entire carbide M in the storage tank 3 is maintained.

In addition, when the in-vessel temperature or the maximum temperature cannot be lowered sufficiently even by increasing the ventilation speed of the second processing gas G2, the ventilation control unit 91 decreases the ventilation speed of the first processing gas G1. Control. As a result, the rate of oxygen supply to the deposit B in the storage tank 3 can be reduced, and the calorific value of the entire deposit B can be reduced. In order to reduce the oxygen concentration of the processing gas G and reduce the maximum oxidation reaction rate of the carbide M in the storage tank 3, the ventilation speed of the second processing gas G2 is not changed and the first processing gas G2 is not changed. The ventilation speed of the gas G1 may be reduced in some cases.

The residence time control unit 93 is a functional unit that controls the discharge speed of the recycled fuel F from the discharge unit 32. In the present embodiment, the residence time control unit 93 controls the discharge speed of the recycled fuel F by controlling the rotation speed of the rotary valve 32a of the discharge unit 32. When the residence time control unit 93 increases the rotation speed of the rotary valve 32a, the discharge speed of the recycled fuel F is increased and the residence time is shortened. When the residence time control unit 93 slows down the rotation speed of the rotary valve 32a, the discharge speed of the recycled fuel F becomes slower and the residence time becomes shorter.

The residence time control unit 93 controls the rotary valve 32a so as to secure a residence time of at least the above-mentioned minimum residence time for the carbide M in all the layer regions. As a result, it is possible to prevent the carbide M, which has not been sufficiently carbide-treated, from being stored as the recycled fuel F in the atmosphere and shipped to the market to cause ignition.

The control of the residence time control unit 93 and the minimum residence time of the deposited layer B1 which is the most downstream layer region will be supplemented. As described above, the minimum residence time, which is one of the determination threshold values, is obtained with the goal that the oxygen characteristic value of the carbide M in each layer region is equal to or less than the oxygen characteristic value required for the recycled fuel F. Further, the residence time control unit 93 controls the rotary valve 32a so as to secure a residence time of at least the above-mentioned minimum residence time for the carbide M in all the layer regions including the deposited layer B1. Therefore, the carbide M (recycled fuel F) of the deposited layer B1 is not discharged from the rotary valve 32a until the oxygen characteristic value becomes equal to or lower than the oxygen characteristic value required for the recycled fuel F. Thereby, the recycled fuel F having a predetermined oxygen characteristic value or less can be manufactured.

[Second embodiment]
A carbide processing apparatus 100 according to the second embodiment will be described based on FIG. The structure of the carbide processing apparatus 100 of the second embodiment is different from that of the carbide processing apparatus 100 according to the first embodiment in the structure of the ventilation part 4.

In the carbide processing apparatus 100 of the second embodiment, the circulation path 40 of the carbide processing apparatus 100 according to the first embodiment communicates the exhaust pipe 33 and the gas supply port 34, whereas the second embodiment The other is the same except that the circulation path 40 of the carbide processing apparatus 100 connects the exhaust pipe (not shown) of the exhaust gas processing facility 13 and the gas supply port 34.

In the second embodiment, the circulation path 40 blows (supply) part of the combustion exhaust gas Ef of the exhaust gas treatment facility 13 to the gas supply port 34 instead of the exhaust gas E. That is, the combustion exhaust gas Ef is used as the second processing gas G2. The combustion exhaust gas Ef is an exhaust gas burned in the secondary combustion furnace 12, and therefore has a low oxygen content. Therefore, the combustion exhaust gas Ef can be used instead of the exhaust gas E as the second processing gas G2.

[Third embodiment]
A carbide processing apparatus 100 according to the third embodiment will be described based on FIG. 6. The structure of the carbide processing apparatus 100 according to the third embodiment is different from that of the carbide processing apparatus 100 according to the first embodiment in the structure of the ventilation part 4.

The carbide treating apparatus 100 of the third embodiment is different from the carbide treating apparatus 100 of the first embodiment in that the air supply pipe 41a and the circulation passage 40 are connected to one gas supply port 34. The carbide processing apparatus 100 of the embodiment is different in that the circulation path 40 and the air supply pipe 41a are separately connected to the first gas supply port 34a and the second gas supply port 34b, respectively, and is otherwise the same. is there.

In the third embodiment, the first gas supply port 34a and the second gas supply port 34b are connected to the upstream side of the rotary valve 32a (inner space side of the storage tank 3) in the discharge pipe 32b of the discharge section 32. There is. As a result, the first processing gas G1 and the second processing gas G2, which are separately supplied from the first gas supply port 34a and the second gas supply port 34b, are stored in the discharge pipe 32b and the lower container of the storage tank 3. The particle layer of the deposit B is aerated while interdiffusing in the vicinity of the lower end 30b. The first processing gas G1 makes solid-gas contact with the particle surface of the carbide M while passing through the particle layer of the deposit B and mutually diffusing with the second processing gas G2, and oxidizes surface functional groups and the like on the particle surface. To do. That is, it is not limited to the case where the first processing gas G1 and the second processing gas G2 are mixed in advance as the processing gas G and then aerated to the particle layer of the deposit B.

[Explanation of Modifications]
In the above-described embodiment, when the maximum temperature of the storage tank 3 (the highest temperature among the internal temperatures of the storage tank 3 detected by the temperature sensor) approaches the bed temperature upper limit, it is necessary to reduce the internal temperature of the tank. The case where the ventilation controller 91 increases the ventilation speed of the second processing gas G2 or decreases the ventilation speed of the first processing gas G1 has been described. Thus, when changing the ratio of supplying the second processing gas G2 (the ratio of the second processing gas G2 to the first processing gas G1), in addition to the temperature inside the storage tank 3 detected by the temperature sensor, In addition, the temperature of the outside air can be added.

In this case, for example, the temperature measurement unit T includes an outside air temperature sensor (not shown), and the ventilation control unit 91 supplies the second processing gas G2 by the ventilation unit 4 based on the temperature detected by the outside air temperature sensor. The ratio can be changed. For example, the maximum temperature of the storage tank 3 approaches the upper limit of the bed temperature, and it is necessary to lower the internal temperature of the tank, so that the ventilation speed of the second processing gas G2 is increased, or the ventilation speed of the first processing gas G1 is increased. In the case of lowering, the rate of change to increase or decrease can be changed based on the temperature detected by the outside air temperature sensor. Specifically, when the temperature detected by the outside air temperature sensor is high (for example, in summer or daytime), the change rate may be increased, and when the temperature detected by the outside air temperature sensor is low (for example, in winter). It is recommended to reduce the change rate during the nighttime). This ensures that the maximum temperature of the storage tank 3 does not exceed the upper limit of the layer temperature when the outside air temperature is high, and the change rate is excessively increased when the outside air temperature is low, resulting in a decrease in processing efficiency. It is possible to avoid such problems.

As described above, it is possible to provide a treated carbide treating apparatus and a carbide treating method for appropriately controlling the self-heating during the treatment and reducing the self-heating property of the carbide.

[Another embodiment]
(1) In the above embodiment, the case where the exhaust gas E or the combustion exhaust gas Ef is used as the second processing gas G2 is illustrated. However, the second treatment gas G2 is not limited to that generated (exhausted) by the organic sludge recycling system 200, and an inert gas such as nitrogen or carbon dioxide may be introduced, or other industrial equipment, for example, It is also possible to use the exhaust gas of a refuse incinerator or the exhaust gas of a thermal power plant. Further, in addition to the exhaust gas E or the combustion exhaust gas Ef generated (exhausted) in the organic sludge recycling system 200, an inert gas such as nitrogen or carbon dioxide may be introduced if necessary. The second processing gas G2 may be mainly composed of an inert gas such as nitrogen or carbon dioxide (for example, 97% by volume or more). The second processing gas G2 only needs to have an oxygen concentration lower than that of air, and oxygen is preferably less than 3 volume percent.

(2) In the above-described embodiment, the rotary valve 32a is used as the discharge device for discharging the recycled fuel F from the storage tank 3, and the recycled fuel F is discharged in a state of being cut off from the atmosphere on the downstream side. .. However, the discharge device is a device that can be used depending on the shape of the recycled fuel F such as pellets, and the recycled fuel F is stored inside the storage tank 3 in a state where the downstream atmosphere does not flow into the storage tank 3 without restriction. It may have any device or structure capable of discharging from the space.

For example, instead of the rotary valve 32a, a double damper that is a discharging device that can discharge the storage tank 3 while physically cutting off the atmosphere from the downstream atmosphere may be used. Alternatively, a screw type discharger or a table feeder type discharger is used, and the processing gas G or the second processing gas G2 is allowed to flow countercurrently through the discharge port so that the atmosphere on the downstream side is not restricted. It is also possible to adopt a configuration in which the state of not flowing into 3 is maintained.

(3) In the above embodiment, the rotary valve 32a is provided in the discharge pipe 32b provided downward from the end 30b of the lower container, which is the lower end of the storage tank 3, and is recycled below the storage tank 3. The case where the fuel F is discharged is illustrated. However, the discharging device is not limited to the structure that discharges the recycled fuel F below the storage tank 3.

For example, the recycled fuel F may be discharged from the side surface of the storage tank 3 by providing a discharge port of a screw type discharger or a table feeder type discharge device on the side surface of the storage tank 3.

(4) In the above embodiment, the determination threshold value setting unit 99 has described the case where the determination threshold value for each layer region is obtained from the oxygen characteristic value for each layer region. Further, a fixed initial value is set in advance as the determination threshold value, and when the oxygen characteristic value is calculated in each layer region, the initial value or the determination threshold value calculated immediately before is updated. explained. And especially about the minimum residence time, the case where 3 days (72 hours) was set as a fixed initial value was described. However, the initial value of the determination threshold is not limited to the case where a fixed value is set.

(5) In the above embodiment, the case where the humidifier 45 is provided in the circulation path 40 and the humidifying water W is spray-supplied to the second processing gas G2 to humidify the second processing gas G2 has been described. However, it is not limited to the case where only the second processing gas G2 is humidified.

For example, in addition to the case where the second processing gas G2 is humidified, the first processing gas G1 may be further humidified. Further, instead of humidifying the second processing gas G2, the first processing gas G1 may be humidified. When humidifying the first processing gas G1, for example, a humidifier (not shown, an example of a second humidifying section) is provided in the air supply pipe 41a.

The initial value of the determination threshold value can also be set based on the oxygen characteristic value of the supplied carbide M. For example, the carbide M to be charged into the storage tank 3 may be sampled to obtain an oxygen characteristic value, and the determination threshold value setting unit 99 may obtain and set the initial value of the residence time based on the oxygen characteristic value.

Note that the configurations disclosed in the above-described embodiments (including other embodiments, the same applies hereinafter) can be applied in combination with the configurations disclosed in other embodiments, as long as no contradiction occurs. The embodiments disclosed in the present specification are exemplifications, and the embodiments of the present invention are not limited thereto, and can be appropriately modified within a range not departing from the object of the present invention.

INDUSTRIAL APPLICABILITY The present invention can be applied to a carbide treatment device that performs a treatment for reducing the self-heating property of carbide while appropriately controlling self-heating during treatment, and a method thereof.

3: Storage tank 4: Ventilation section 9: Control section 33: Exhaust pipe (exhaust port)
34: Gas supply port (air supply port)
40: Circulation path (second ventilation section)
41: Air supply fan (first ventilation part)
41a: Air supply pipe (first ventilation part)
42: Circulation fan (second ventilation part, exhaust gas blower)
45: Humidifier (humidifying section)
100: Carbide processing device B: Deposit (carbide)
B1: Deposited layer (carbide)
B2: deposited layer (carbide)
B3: Deposited layer (carbide)
E: Exhaust gas G: Processing gas G1: First processing gas G2: Second processing gas M: Carbide T: Temperature measuring part T1: Temperature sensor T2: Temperature sensor T3: Temperature sensor T31: Temperature sensor T32: Temperature Sensor T33: Temperature sensor T4: Temperature sensor T5: Temperature sensor

Claims (7)

A storage tank that accumulates and stores carbide having self-heating properties in layers,
A ventilation part that vents from the bottom of the deposited layer of the carbide toward the top of the deposited layer,
A temperature measuring unit for measuring the temperature inside the storage tank,
A control unit that cools the carbide by controlling the aeration unit so that the temperature in the bath becomes a predetermined threshold value or less,
An air supply port provided at the lower end of the storage tank for supplying air to the ventilation section,
An exhaust port provided at the upper end of the storage tank for exhausting gas that has passed through the deposition layer ,
The ventilation part is
A first ventilation part for supplying a first processing gas containing oxygen,
A second ventilation part for supplying an inert gas as a second processing gas,
The control unit controls at least one of the first processing gas and the second processing gas to cool the carbide ,
A carbide treating apparatus in which a resistor for maintaining a positive pressure in the internal space of the storage tank is provided at the exhaust port . The carbide processing apparatus according to claim 1, wherein the second processing gas is exhaust gas from the storage tank. The second vent before SL includes a circulation path which communicates with the exhaust port and the air inlet, and an exhaust gas blower for blowing the exhaust gas toward the air inlet from the outlet in the circulation path, The carbide treating apparatus according to claim 2, further comprising a humidifying unit that humidifies the exhaust gas. The temperature measuring unit has a plurality of temperature sensors,
Each of the plurality of temperature sensors is installed at different height positions in the storage tank,
The control unit controls at least one of the gas temperatures of the first processing gas and the second processing gas to be a temperature lower than the highest in-vessel temperature detected by the temperature sensor. The carbide treatment device according to any one of claims 1 to 3. The control unit increases the ratio of the supply rate of the second processing gas to the supply rate of the first processing gas in order to decrease the temperature in the tank. The carbide treatment apparatus described. The carbide treatment device according to any one of claims 1 to 5, wherein the first ventilation part has a second humidification part that humidifies the first processing gas. A storage step of depositing and storing a carbide having self-heating properties in a storage tank in a layered manner,
The gas that has passed through the deposition layer is provided at the upper end of the storage tank by ventilating from the lower part of the deposition layer of the carbide toward the upper part of the deposition layer through an air supply port provided at the lower end of the storage tank. Ventilation process to exhaust from the exhaust port ,
A temperature measuring step of measuring the temperature inside the storage tank,
A temperature control step of cooling the carbide by controlling the temperature in the bath to be a predetermined threshold value or less,
The aeration step,
A first venting step of venting a first processing gas containing oxygen;
A second ventilation step of ventilating an inert gas as a second processing gas,
The temperature control step, the first processing gas, and, at least one of the second processing gas is controlled to cool the carbide ,
The aeration step is a method for treating carbide, in which the internal space of the storage tank is maintained at a positive pressure by a resistor provided at the exhaust port .

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