Carbide manufacturing equipment

Abstract

To provide an energy-saving carbide manufacturing equipment capable of heating a processing gas.SOLUTION: A carbide manufacturing equipment 200 is assembled with a carbonization furnace 10 for carbonization, a storage tank 3 for receiving and cure treatment of a carbide M formed in the carbonization furnace 10, and a processing gas feed mechanism 41 for feeding a processing gas G to the storage tank 3, wherein the processing gas feed mechanism 41 feeds a processing gas G heated by using a heat of an exhaust gas generated in a processing system to the storage tank.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a carbide manufacturing facility. [Background technology]

[0002] Organic waste such as sewage sludge is, for example, carbonized by heating in a carbonization facility and reused as fuel. The carbonized organic waste thus obtained has highly active surface functional groups on its particle surface immediately after carbonization, and is known to have self-heating properties in its original state. Therefore, to ensure safety during storage, the carbonized organic waste is subjected to a process to reduce its self-heating properties in a storage tank (a so-called aging process, hereinafter referred to as "curing process") (see, for example, Patent Documents 1 to 3).

[0003] Patent Document 1 describes a method for treating charcoal obtained by carbonizing organic matter-containing sludge generated during wastewater treatment in a carbonization furnace. In this treatment method, the charcoal obtained by the carbonization treatment is oxidized in a low-temperature oxidizing atmosphere to prevent the surface oxidation reaction of the charcoal from converging in advance. This prevents the stored charcoal from inducing combustion due to self-heating caused by the low-temperature oxidation reaction.

[0004] Patent Document 2 describes a carbonized product production facility for organic matter-containing sludge, which is equipped with a stabilization treatment furnace that stabilizes the carbonized product after carbonization in the carbonization furnace by subjecting active groups that are highly active in the oxidation reaction of the carbonized product to a non-combustion oxidation reaction. It describes that the stabilization treatment furnace of this carbonized product production facility performs an oxidation reaction at a temperature range of 60°C to 200°C, without nitrogen purging or the like, and retains the sludge in an air atmosphere for a predetermined period of time (e.g., 10 hours).

[0005] Patent Document 3 describes a charcoal production facility that includes a heating means for carbonizing or drying a carbon-containing material and a humidifying means for humidifying the heat-treated material from the heating means. This charcoal production facility transports the humidified heat-treated material using an air flow, temporarily stores the heat-treated material transported by the air flow in a stabilization treatment tank, and vents air into the stabilization treatment tank as a treatment gas. This treatment facility stabilizes the heat-treated material by suppressing a temperature rise above a certain level due to the latent heat of evaporation of residual moisture caused by humidification, even if the heat-treated material generates heat during transportation or storage. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-267950 [Patent Document 2] Japanese Patent Application Laid-Open No. 2004-277464 [Patent Document 3] Japanese Patent Application Laid-Open No. 2016-124897 Summary of the Invention [Problem to be solved by the invention]

[0007] However, these conventional techniques do not adequately control the temperature of the treatment gas supplied to the storage tank for the curing treatment, and there is room for improvement in the efficiency of the curing treatment.

[0008] Therefore, there is a demand for energy-saving carbide production equipment that can appropriately control the temperature of the processing gas. [Means for solving the problem]

[0009] The characteristic configuration of the carbide manufacturing equipment of the present invention is that it comprises a carbonization furnace that performs carbonization processing, a storage tank that receives the carbide produced in the carbonization furnace and performs curing processing, and a processing gas supply mechanism that supplies processing gas to the storage tank, and the processing gas supply mechanism supplies the processing gas that has been heated using the heat of exhaust gas generated in the processing system to the storage tank.

[0010] The temperature of the processing gas used in the curing treatment of carbide is desirably equal to or higher than a predetermined temperature to efficiently perform the curing treatment. Therefore, according to this configuration, the processing gas supply mechanism supplies the processing gas heated using the heat of the exhaust gas generated in the processing system to the storage tank, thereby efficiently performing the curing treatment of the carbide in the storage tank. Because the processing gas is heated using the heat of the exhaust gas generated in the processing system, the heat of the exhaust gas can be effectively utilized. This makes it possible to provide a carbide production facility that is more energy-efficient than, for example, a system that heats atmospheric air using a new heating device such as a heater.

[0011] Another characteristic feature is that the processing gas supply mechanism includes a first processing gas supply mechanism that supplies a first processing gas containing oxygen, and a second processing gas supply mechanism that supplies at least a portion of the second processing gas discharged from the storage tank, and the processing gas includes the first processing gas and the second processing gas.

[0012] According to this configuration, the process gas supply mechanism includes a first process gas supply mechanism that supplies a first process gas containing oxygen and a second process gas supply mechanism that supplies at least a portion of the second process gas discharged from the storage tank. In the storage tank, the oxygen contained in the process gas oxidizes highly active surface functional groups on the surfaces of the carbide particles, thereby performing a curing treatment that reduces the self-heating tendency of the carbide. Therefore, the oxygen concentration of the second process gas discharged from the storage tank is low. Therefore, by mixing the first process gas and the second process gas, the oxygen concentration of the process gas supplied to the storage tank can be adjusted. Furthermore, because the temperature of the second process gas discharged from the storage tank decreases due to the influence of the outside air temperature, the temperature can be adjusted by mixing it with the first process gas.

[0013] Another characteristic configuration is that the system further comprises a discharge section that discharges the purified combustion exhaust into the atmosphere, and a heat exchanger that heats the air using the heat of the exhaust gas, wherein the first treatment gas contains at least a portion of white smoke prevention air for heating the combustion exhaust, and the white smoke prevention air is the air that has been heated in the heat exchanger.

[0014] According to this configuration, the first processing gas contains at least white smoke prevention air, which is air heated using the heat of the exhaust gas in a heat exchanger, so that a heater or the like for heating the first processing gas is not required, and the heat of the exhaust gas can be used efficiently. As a result, a more energy-efficient carbide production facility can be provided.

[0015] Another characteristic feature is that the first processing gas supply mechanism includes a first humidifier that humidifies the first processing gas.

[0016] In order to efficiently perform the curing treatment of carbide, it is desirable that the relative humidity of the processing gas be equal to or higher than a predetermined value. According to this configuration, since the first processing gas supply mechanism has a first humidifier that humidifies the first processing gas, the heated first processing gas can be humidified and the processing gas can be adjusted to a temperature and humidity suitable for the curing treatment of carbide. This makes it possible to provide a carbide manufacturing facility that can efficiently perform the curing treatment.

[0017] Another characteristic feature is that the first humidifier reuses water used in the treatment system to humidify the first treatment gas.

[0018] According to this configuration, the first humidifier reuses the water used in the treatment system to humidify the first treatment gas, so that the water generated in the treatment system can be recycled without being discarded, thereby making effective use of the water, and thereby reducing operating costs.

[0019] Another characteristic feature is that the first processing gas supply mechanism has a bypass path for supplying the air to the storage tank.

[0020] According to this configuration, the first processing gas supply mechanism has a bypass path that supplies air to the storage tank without supplying it to the heat exchanger, so the temperature of the first processing gas can be adjusted by mixing or separately supplying heated white smoke prevention air and unheated air.

[0021] Another characteristic feature is that the process gas supply mechanism includes a heater that heats the process gas and a second humidifier that humidifies the process gas.

[0022] According to this configuration, since the heater for heating the processing gas and the second humidifier for humidifying the processing gas are provided, the processing gas including the first processing gas and the second processing gas can be adjusted to a temperature and humidity suitable for the curing treatment. This allows fine adjustment of the temperature and humidity of the processing gas supplied to the storage tank. Furthermore, even when heat from the exhaust gas is not supplied to the heat exchanger during maintenance, for example, the processing gas can be adjusted to a temperature and humidity suitable for the curing treatment and supplied to the storage tank. [Brief explanation of the drawings]

[0023] [Figure 1] FIG. 1 is a configuration diagram of a carbide manufacturing facility according to a first embodiment. [Figure 2] FIG. 1 is an explanatory diagram of a curing treatment device according to a first embodiment. [Figure 3] FIG. 10 is a configuration diagram of a carbide manufacturing facility according to a second embodiment. [Figure 4] FIG. 10 is an explanatory diagram of a curing treatment device according to a second embodiment. [Figure 5] FIG. 10 is a configuration diagram of a carbide manufacturing facility according to a third embodiment. [Figure 6] FIG. 10 is a configuration diagram of a carbide manufacturing facility according to a fourth embodiment. [Figure 7] FIG. 10 is a configuration diagram of a carbide manufacturing facility according to a fifth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0024] Hereinafter, an embodiment of a carbide manufacturing system according to the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiment, and various modifications are possible without departing from the spirit of the present invention.

[0025] First Embodiment [Explanation of overall configuration] A carbide production facility 200 according to a first embodiment will be described with reference to Figures 1 and 2. The carbide production facility 200 according to the first embodiment reuses organic sludge, such as sewage sludge, as recycled fuel F. In this embodiment, a case will be described in which dried sludge L, which is organic sludge that has been dried and granulated into pellets in advance, is supplied to the carbide production facility 200. The carbide production facility 200 obtains recycled fuel F by carbonizing the dried sludge L, for example.

[0026] The charcoal production facility 200 mainly includes a carbonization furnace 10, a cooler 20, a curing treatment device 100, and a stock tank 27. As shown in Fig. 2, the curing treatment device 100 performs a treatment to reduce the self-heating property of the charcoal M obtained from the dried sludge L by a curing treatment method described later (so-called aging treatment (low-temperature oxidation treatment), hereinafter referred to as "curing treatment").

[0027] The dried sludge L may be granulated into cylindrical pellets by, for example, an extrusion granulation method, in order to homogenize the particle shape, bulk density, and other particle properties of the dried sludge L or the charcoal M and recycled fuel F obtained from the dried sludge L, thereby improving the handleability of the charcoal M and the like in the char production equipment 200 and the aging treatment device 100 and the uniformity of the curing treatment.

[0028] As shown in FIG. 1, dried sludge L is supplied to a carbonization furnace 10 and carbonized. This produces a cylindrical pellet-shaped carbonized material M. The carbonized material M does not have to be entirely pellet-shaped; it may contain powder or granular material. The carbonized material M discharged from the carbonization furnace 10 is humidified and cooled in a cooler 20. It is then stored in a curing treatment device 100 for a predetermined time. The curing treatment device 100 performs a curing treatment by passing an oxygen-containing treatment gas G through the stored carbonized material M for a predetermined time (see FIG. 2). The cured carbonized material M becomes recycled fuel F, which can be safely stored in a tank or the like, and is discharged from the curing treatment device 100. The recycled fuel F discharged from the curing treatment device 100 is stored in a stock tank 27 in preparation for shipment to the market. Hereinafter, the downstream side of the transport path of the carbonized material M or recycled fuel F from the carbonization furnace 10 to the stock tank 27 will be simply referred to as the downstream side, and the opposite side will be referred to as the upstream side.

[0029] [Explanation of each part] The carbonization furnace 10 is a device that heats dried sludge L in a low-oxygen atmosphere (hereinafter, this may be referred to as "carbonization treatment") to obtain a carbonized material M. The carbonization furnace 10 is composed of a rotary kiln. The carbonization furnace 10 may be of a rotary kiln type, a fluidized bed type, a screw type, or the like. The carbonization furnace 10 carbonizes the dried sludge L at a temperature of approximately 250°C to 600°C.

[0030] In the carbonization furnace 10 of this embodiment, combustible dry distillation gas is generated from the dried sludge L during the carbonization process. The dry distillation gas is supplied to, for example, the secondary combustion furnace 12 and burned, and then passes through exhaust gas treatment equipment (not shown), such as a dust collector or scrubber, before being discharged to the outside from a discharge section (not shown) as combustion exhaust Ef. When the outside air temperature is low or the humidity of the combustion exhaust Ef is high, the water vapor contained in the combustion exhaust Ef may condense into water droplets, which appear white. The combustion exhaust Ef in this state is referred to as white smoke. In the carbonized material production equipment 200 of this embodiment, white smoke prevention air is mixed with the combustion exhaust Ef to prevent the generation of white smoke.

[0031] The white smoke prevention air is high-temperature, low-humidity air. In this embodiment, the white smoke prevention air is air A heated using exhaust gas generated in a treatment system for the charcoal M. The treatment system refers to the devices in the charcoal production equipment 200 downstream from the carbonization furnace 10 and the devices that treat the dry distillation gas generated in the carbonization furnace 10. As shown in FIG. 1 , the white smoke prevention air is generated by heat exchange in a heat exchanger 50 between air A drawn in through the white smoke prevention fan 71 and exhaust gas generated in the secondary combustion furnace 12. Air A is heated to approximately 300°C to become white smoke prevention air. The white smoke prevention air passes through a white smoke prevention supply path 70 and merges with the combustion exhaust gas Ef.

[0032] After being discharged from the carbonization furnace 10, the carbide M is introduced into the cooler 20 via a chute 11 or the like. The cooler 20 is a device for cooling the carbide M. In this embodiment, the cooler 20 is a device equipped with a nozzle for supplying cooling water CW to a screw conveying device that moves the carbide M using a screw provided in a casing. In this embodiment, the cooler 20 conveys the carbide M in one direction using a screw, and sprays and supplies cooling water CW to the carbide M being conveyed.

[0033] 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 below 60°C. In this 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 a moisture content of 5% to 20%, particularly preferably 13% to 17%, on a dry basis (weight ratio to the weight of completely dried carbide).

[0034] In this embodiment, a cooling gas CG, which is an inert gas such as nitrogen, flows through the cooler 20 in a direction opposite to the flow of the carbide M. In the cooler 20, in addition to the cooling gas CG and the water vapor of the cooling water CW, flammable gases such as carbon monoxide gas and odorous gases are generated. Therefore, in this embodiment, the exhaust from the cooler 20 is introduced into the secondary combustion furnace 12 via an exhaust pipe 14. The cooled carbide M is supplied from the cooler 20 to a flight conveyor 22. In this embodiment, the carbide M is supplied to the flight conveyor 22 via a rotary valve 21 that separates the cooler 20 from an inlet (not shown) of the flight conveyor 22.

[0035] The carbide M discharged from the cooler 20 is transported to the cushion tank 23 by the flight conveyor 22, and is supplied from the cushion tank 23 to the curing treatment device 100. In this embodiment, the carbide M transported to the cushion tank 23 is supplied to the curing treatment device 100 via a 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 curing treatment device 100 via a chute or the like. Furthermore, instead of transporting by the flight conveyor 22, transport may be performed using pneumatic transport, a belt conveyor, a bucket conveyor, or the like.

[0036] The curing treatment device 100 is a device that cures the carbide M to obtain recycled fuel F. The curing treatment device 100 will be described later. The recycled fuel F obtained in the curing treatment device 100 is transported to a cushion tank 26 by a flight conveyor 25. At this time, an air cooling device 25a, such as a heat exchanger to which a refrigerant is supplied from a chiller, is disposed upstream of the flight conveyor 25, and the recycled fuel F may be cooled using air A cooled by this air cooling device 25a. The recycled fuel F is transferred from the cushion tank 26 to a stock tank 27 and stored therein until shipment.

[0037] The curing treatment device 100 will be described in detail. As shown in Fig. 2, the curing treatment device 100 includes a storage tank 3 for storing carbide M and performing a curing treatment thereon, and a processing gas supply mechanism 4 for ventilating (supplying) a processing gas G to the deposit B of carbide M stored in the storage tank 3.

[0038] The processing gas G contains at least a first processing gas G1 containing oxygen. In this embodiment, the first processing gas G1 is a part of white smoke prevention air, which is air A heated by the exhaust gas generated in the secondary combustion furnace 12.

[0039] The processing gas supply mechanism 4 has a first processing gas supply mechanism 41 that supplies a first processing gas G1. The first processing gas supply mechanism 41 has a first supply path 410 branching from a white smoke prevention supply path 70 that supplies white smoke prevention air to the combustion exhaust Ef, a first humidifier 41a disposed on the first supply path 410, and a first fan 41b. The first humidifier 41a has a nozzle and is a device that sprays and supplies humidification water W into the first processing gas G1 to humidify the first processing gas G1. The first processing gas G1 is cooled by the sensible heat of the humidification water W and the latent heat of vaporization of the humidification water W. The first supply path 410 includes a pipe 411 that guides the first processing gas G1 from the gas supply path 70 to the first humidifier 41a, a pipe 412 that guides the first processing gas G1 from the first humidifier 41a to the first fan 41b, and a pipe 413 that guides the first processing gas G1 from the first fan 41b to the gas supply port 34. The first humidifier 41a may be disposed downstream of the first fan 41b.

[0040] The curing treatment device 100 performs a storage process of storing the carbonized material M in a storage tank 3, an aeration process of passing a treatment gas G containing oxygen through a deposit B of the carbonized material M, and a discharge process of retaining the carbonized material M for a predetermined period of time and then discharging it, thereby achieving a curing treatment of the carbonized material M and obtaining recycled fuel F.

[0041] As described below, the curing treatment device 100 performs a temperature measurement process to measure the temperature inside the storage tank 3 and an aeration process to aerate the processing gas G through the deposit B of carbide M in order to reliably ensure the safety of the recycled fuel F (low self-heating) and the safety of the curing treatment by the curing treatment device 100. Here, the temperature of the processing gas G vented into the storage tank 3 is preferably 40°C to 55°C. When atmospheric air A is vented into the storage tank 3 as the processing gas G, a heating device or the like is required to heat the processing gas G. However, in this embodiment, white smoke-preventing air, which is air A heated by the exhaust gas generated in the secondary combustion furnace 12, is used as the processing gas G (first processing gas G1), so that a heating device or the like is not required. Therefore, the processing gas G at an appropriate temperature can be vented without consuming fuel or electricity for heating the processing gas G, thereby making it possible to configure the carbide production facility 200 more energy-efficient.

[0042] Furthermore, the relative humidity of the process gas G vented into the storage tank 3 is preferably 70% to 90%. Therefore, by humidifying the first process gas G1 using the first humidifier 41a arranged on the first supply line 410, the process gas G having an appropriate relative humidity can be supplied to the storage tank 3. The humidification water W used in the first humidifier 41a can be recycled water used in the treatment system of the carbonized material production facility 200. The treatment system here is not limited to the devices that treat the dry distillation gas generated in the carbonization furnace 10, but refers to the devices that use cooling water, etc. in the carbonized material production facility 200. By recycling water in this way, water resources can be used effectively, thereby reducing operating costs.

[0043] The storage tank 3 is a metal container that stores the carbide M in layers by stacking it vertically. The storage tank 3 is also a supply container that supplies the carbide M stored in layers to the next process while maintaining the layered state. The storage tank 3 has a supply section 31 that serves as an inlet for introducing the carbide M into the internal space of the container body 30 of the storage tank 3, and a discharge section 32 that discharges the recycled fuel F from the internal space of the storage tank 3.

[0044] The container body 30 of the storage tank 3 of this embodiment integrally comprises a cylindrical upper container having a top plate 30a closing the upper end, and a lower container tapering downward from the upper container in a cone shape. The cross section of the storage tank 3 is circular, and the angle at which the lower container narrows (the cone angle) is set to an angle at which the carbide M (recycled fuel F) is properly discharged from the discharge portion 32. A pincushion-shaped baffle (a so-called cone baffle) may be provided near the boundary between the upper container and the lower container within the storage tank 3, near the center of the storage tank 3 in the radial direction.

[0045] 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 top surface of the container, which is the upper end of the container body 30 of the storage tank 3, and has a supply pipe connected to the internal space of the storage tank 3 and a rotary valve 31a provided on the supply pipe. The storage tank 3 can introduce the carbide M into the internal space in a state isolated from the upstream atmosphere by the rotary valve 31a. Note that the storage tank 3 may have a double damper as an isolation device instead of the rotary valve 31a. In this embodiment, the carbide M is continuously supplied to the supply unit 31 at a constant supply rate.

[0046] 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. The discharge part 32 has a discharge pipe 32b connected to the internal space of the storage tank 3, and a rotary valve 32a provided in the discharge pipe 32b as a discharge device for discharging the carbide M (recycled fuel F).

[0047] In this embodiment, the discharge pipe 32b is a cylindrical pipe that extends downward from the end 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 below the storage tank 3 while being isolated from the downstream atmosphere by the rotary valve 32a. Note that instead of the rotary valve 32a, a double damper may be provided as an isolation device, or a table feeder may be provided as a discharge device. In this embodiment, the recycled fuel F is continuously discharged from the discharge section 32.

[0048] In this embodiment, as described above, the carbide M is continuously fed 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 residence 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 length necessary and sufficient 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 and therefore undesirable.

[0049] The storage tank 3 has a gas supply port 34 at its lower end, which introduces a processing gas G into the internal space and supplies the processing gas G containing oxygen to the deposits B. The gas supply port 34 may be provided in the body of the storage tank 3, or multiple gas supply ports 34 may be provided. The gas supply port 34 is connected to the upstream side of the rotary valve 32a (the internal space side of the storage tank 3) in the discharge pipe 32b of the discharge unit 32. As a result, the processing gas G supplied from the gas supply port 34 is passed through the particle layer of the deposits B from the end 30b at the lower end of the lower vessel of the storage tank 3. The processing gas G comes into solid-gas contact with the particle surfaces of the carbide M while passing through the particle layer of the deposits B, oxidizing surface functional groups and the like on the particle surfaces.

[0050] The exhaust gas E (processing gas G) that has passed through the particle layer of the deposit B is discharged to the outside as exhaust gas E from an exhaust pipe 33 provided at the upper end of the storage tank 3. The exhaust gas E is introduced into a secondary combustion furnace 12 (see FIG. 1) or the like, purified, and then discharged into the atmosphere.

[0051] Temperature sensors T1 to T4 (hereinafter, the temperature sensors T1 to T4 may be collectively referred to simply as "temperature sensors"), which are sensor probes of the temperature measurement unit T, are attached to the storage tank 3. In this embodiment, the temperature sensors are rod-shaped sensor probes with a temperature detection unit at their tips (hereinafter, simply referred to as "sensor tips"), and use resistance temperature detectors. Thermocouples or other sensors may also be used as the temperature sensors.

[0052] The temperature sensors are installed in the wall of the storage tank 3. The temperature sensors are attached along the radial direction of the storage tank 3, with rod-shaped sensor probes penetrating the wall of the container body 30 from the outer side of the storage tank 3, and the tips of the sensors being positioned inside the storage tank 3. As shown in FIG. 2, the temperature sensors are attached to the storage tank 3 in the order of temperature sensor T1 to temperature sensor T4, from the bottom (downstream side) to the top (upstream side) of the storage tank 3. Note that the temperature sensors are not limited to being attached along the radial direction of the container body 30, but may be attached so as to be inclined upward or downward with respect to the vertical direction of the container body 30, or so as to be inclined with respect to the circumferential direction of the container body 30. Furthermore, the method of attaching the temperature sensors is not limited to penetrating the wall, and they may be attached so as to hang down from the top plate 30a, for example.

[0053] The temperature sensor T1 is provided on the discharge pipe 32b of the discharge section 32 upstream of the rotary valve 32a, and the tip of the sensor is inserted into the center of the discharge pipe 32b in the radial direction of the pipe.

[0054] The temperature sensors T2 to T4 are inserted into the reservoir 3 from the wall at different height positions so as to come into contact with the sediment B at different height positions. Therefore, the temperature sensors T2 to T4 measure the temperatures of the sediment B inside the reservoir 3 at different height positions. Each of the temperature sensors T1 to T4 may be configured to include multiple sensor probes, and the sensor probes may be arranged at equal intervals at the same height position on the wall of the reservoir 3. The temperature sensors T1 to T4 may calculate their measurement values ​​by averaging the values ​​measured by the respective sensor probes at the same height position.

[0055] In this embodiment, as shown in FIG. 2 , the exhaust pipe 33 is provided on the top plate 30a of the storage tank 3. The exhaust pipe 33 is provided with a resistor 33a that provides resistance to the flow of the exhaust gas E to maintain a positive pressure in the internal space of the storage tank 3. The resistor 33a can be, for example, a valve device with an adjustable opening, such as a butterfly valve. The resistance to the flow of the exhaust gas E can be changed by changing the opening of the resistor 33a. Increasing the resistance to the flow of the exhaust gas E changes the pressure in the internal space of the storage tank 3 to the positive pressure side. Maintaining the pressure in the internal space of the storage tank 3 to the positive pressure side prevents oxygen-containing gas from flowing (intruding) into the internal space of the storage tank 3 from any source other than the gas supply port 34. In other words, preventing intrusion into the internal space of the storage tank 3 prevents the carbide M from locally heating up and catching fire due to the intrusion.

[0056] [Control Unit] Next, the control unit 9 will be described. The control unit 9 is a central control mechanism that controls the overall operation of the curing treatment device 100. The control unit 9 can be configured, for example, by software programs for implementing various processes, a CPU that executes the software programs, and various hardware controlled by the CPU. In this embodiment, the control unit 9 is a computer that includes a CPU and input / output circuits, etc. In this embodiment, the programs, data, and control parameters required for the operation of the control unit 9 are stored in a memory unit (not shown). Note that there is no particular limitation on where these programs and data are stored. These programs and data may be stored in a separate, dedicated storage device such as a disk or flash memory. Alternatively, they may be stored in an external server or memory unit connected to enable communication.

[0057] By executing a program stored in the memory unit, the control unit 9 realizes, in software, the following components: a judgment threshold setting unit 99 that sets a judgment threshold for the control unit 9 to perform control; an aeration control unit 91 that controls the processing gas supply mechanism 4 based on the judgment threshold; a temperature control unit 92 that controls the aeration temperature of the processing gas supply mechanism 4 and the temperature inside the storage tank 3 based on the judgment threshold; a residence time control unit 93 that controls the residence time of the deposit B based on the judgment threshold; and a humidity control unit 94 that controls the relative humidity of the first processing gas G1 based on the measured value of relative humidity.

[0058] The determination threshold setting unit 99 acquires the temperature inside the storage tank 3 from the temperature measuring unit T, sets an upper limit temperature of the supply air, which will be described later, and the control unit 9 performs control, which will be described later, based on this determination threshold.

[0059] The temperature control unit 92 will be described. The temperature control unit 92 is a functional unit that controls the gas temperature of the processing gas G (in this embodiment, the first processing gas G1). The temperature control unit 92 controls the gas temperature of the processing gas G so that it is equal to or lower than the upper limit temperature of the supply gas.

[0060] Furthermore, the temperature control unit 92 controls the temperature of the processing gas G so that the highest temperature (hereinafter simply referred to as the "maximum temperature") among the temperatures inside the storage tank 3 detected by the temperature sensors is less than a predetermined threshold value (hereinafter referred to as the "upper layer temperature limit"). In this embodiment, the temperature sensors T1 to T4 measure the temperature inside the storage tank 3 at different height positions. Therefore, the temperature control unit 92 controls the temperatures of the processing gas G, etc. so that the highest temperature among the measured values ​​of the temperature sensors T1 to T4 is less than the upper layer temperature limit.

[0061] The upper limit supply air temperature will be described. The upper limit supply air temperature is a threshold value set as the upper limit of the gas temperature of the processing gas G. The judgment threshold value setting unit 99 acquires temperature information detected by the temperature sensor from the temperature measurement unit T, and sets a temperature lower than the highest temperature among the temperatures inside the storage tank 3 detected by the temperature sensor as the upper limit supply air temperature. In this embodiment, the upper limit supply air temperature is set to a temperature lower than the highest temperature and less than 60°C.

[0062] The upper limit of the bed temperature is set to be less than 60°C. In other words, the temperature control unit 92 controls the temperature of the processing gas G, etc. so that the maximum temperature is less than 60°C. This prevents the risk of the carbide M igniting due to uneven ventilation of the processing gas G or uneven quality of the carbide M. It is preferable that the upper limit temperature of the supply air be set to at least be less than the upper limit of the bed temperature.

[0063] As described above, the gas temperature of the processing gas G supplied to the storage tank 3 is preferably 40° C. to 55° C. Therefore, the supply temperature of the processing gas G is preferably lower than the upper limit of the bed temperature and 40° C. or higher.

[0064] 2, in this embodiment, the first processing gas G1 is part of the white smoke prevention air, and therefore the temperature of the first processing gas G1 is the temperature of the white smoke prevention air. The temperature of the white smoke prevention air is approximately 300°C, and is cooled by the first humidifier 41a to approximately 50°C to 60°C. The temperature control unit 92 can control the temperature of the first processing gas G1, and therefore the processing gas G, by, for example, increasing or decreasing the amount of humidification water W supplied to the first processing gas G1 by the first humidifier 41a or increasing or decreasing the temperature of the humidification water W, so that the temperature of the first processing gas G1 is 30°C or higher and lower than the upper limit of the bed temperature.

[0065] The ventilation control unit 91 will be described. The ventilation control unit 91 is a functional unit that controls the processing gas supply mechanism 4 to control the ventilation rate of the first processing gas G1. The ventilation control unit 91 controls the ventilation rate of the first processing gas G1 so that the maximum temperature within the storage tank 3 is less than the upper limit of the bed temperature.

[0066] In this embodiment, when the maximum temperature of the storage tank 3 approaches the upper limit of the bed temperature and it becomes necessary to lower the temperature inside the tank, the ventilation control unit 91 controls to adjust the ventilation speed according to the temperature of the first processing gas G1. When the supply rate of the first processing gas G1 is increased, heat removal from the sediment B due to ventilation of the storage tank 3 progresses, and the temperature inside the tank drops. Therefore, the ventilation control unit 91 and the temperature control unit 92 appropriately control the flow rate and temperature of the first processing gas G1 to adjust the heat generation amount of the sediment B and appropriately maintain the temperature inside the tank.

[0067] 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 this 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 increases and the residence time decreases. When the residence time control unit 93 decreases the rotation speed of the rotary valve 32a, the discharge speed of the recycled fuel F decreases and the residence time decreases.

[0068] The residence time control unit 93 controls the rotary valve 32a to ensure that the carbide M in the container body 30 of the storage tank 3 has a residence time of at least a predetermined residence time. This prevents the carbide M that has not been sufficiently cured from being stored in the atmosphere as recycled fuel F and from catching fire if shipped to the market. The predetermined residence time is the remaining processing time required to convert the carbide M into recycled fuel F (to undergo curing treatment) that can be safely stored even when in contact with the ambient air. In this embodiment, the initial value is set to 2 days (48 hours).

[0069] The humidity control unit 94 will be described. The humidity control unit 94 is a functional unit that controls the first humidifier 41a to control the relative humidity of the first process gas G1. The humidity control unit 94 controls the relative humidity of the first process gas G1 by, for example, increasing or decreasing the amount of humidification water W supplied to the first process gas G1 by the first humidifier 41a so that the relative humidity of the first process gas G1 becomes a predetermined value. The relative humidity of the process gas G supplied to the storage tank 3 is preferably 70% to 90%. By supplying the first process gas G1 with an appropriate relative humidity adjusted by the humidity control unit 94 to the storage tank 3, the curing treatment of the carbide M can be efficiently performed. The first process gas supply mechanism 41 may have a humidity measuring unit H on the pipe 413 that measures the humidity of the first process gas G1, and the humidity control unit 94 may control the first humidifier 41a based on the humidity measured by the humidity measuring unit H. The humidity control unit 94 may adjust the humidity of the processing gas G so that the temperature of the processing gas G falls within a predetermined temperature range.

[0070] Second Embodiment Next, a carbide production equipment 200 according to a second embodiment will be described. The configuration of the carbide production equipment 200 according to the second embodiment is different from that of the carbide production equipment 200 according to the first embodiment in the configurations of the storage tank 3 and the processing gas supply mechanism 4. Descriptions of the same configuration as in the first embodiment will be omitted.

[0071] 3 and 4, in the carbide production equipment 200 according to the second embodiment, the processing gas supply mechanism 4 has a second processing gas supply mechanism 42 that supplies a part of the exhaust gas E discharged from the storage tank 3 as a processing gas G (second processing gas G2) to the storage tank 3. That is, in this embodiment, a part of the processing gas G supplied to the storage tank 3 is recycled and reused.

[0072] The second processing gas supply mechanism 42 has a second supply path 420 that connects the exhaust pipe 33 and the piping 413, and circulates (supplies) a portion of the exhaust gas E to the piping 413. A second fan 42a is provided in the second supply path 420. The second fan 42a is a blower that blows the exhaust gas E, which is the second processing gas G2, through the second supply path 420 from the exhaust pipe 33 toward the piping 413. A blower, a fan, or the like can be used as the second fan 42a. The second supply path 420 has a piping 421 that guides the exhaust gas E from the exhaust pipe 33 to the second fan 42a, and a piping 422 that guides the exhaust gas E from the second fan 42a to a connection N with the piping 413. The connection N is downstream of the first fan 41b in the first supply path 410. At the connection part N, the first processing gas G1 and the second processing gas G2 are mixed to become the processing gas G, and the processing gas G is supplied to the storage tank 3 from the gas supply port .

[0073] The pipe 422 does not have to be connected to the pipe 413, and may be connected to the gas supply port 34. In this case, the first processing gas G1 and the second processing gas G2 are supplied separately to the storage tank 3 without being mixed with each other.

[0074] Even if the supply amount of the second processing gas G2 is increased or decreased, the total amount of the exhaust gas E discharged from the exhaust pipe 33 does not change because the second processing gas G2 is simply circulated in the storage tank 3.

[0075] The temperature control unit 92 controls the gas temperature of the processing gas G so that the maximum temperature of the storage tank 3 is less than the upper limit of the bed temperature. In this embodiment, the temperature control unit 92 controls the gas temperature of the first processing gas G1 and / or the second processing gas G2. A heat exchanger or the like may be provided on the second supply path 420, and the temperature control unit 92 may control the temperature of the second processing gas G2 by controlling this. As will be described later, the control unit 9 may control the gas temperature of the processing gas G by changing the mixing ratio of the first processing gas G1 and the second processing gas G2 under the condition that the ventilation amount determined by the ventilation control unit 91 is satisfied.

[0076] In this embodiment, a humidity measuring unit H for measuring the humidity of the first processing gas G1 or the second processing gas G2 is provided on the first supply path 410 downstream of the first fan 41b and on the second supply path 420. The control unit 9 controls the relative humidity of the processing gas G based on the relative humidity of the first processing gas G1 and the relative humidity of the second processing gas G2 measured by the humidity measuring unit H. The control unit 9 may control the relative humidity of the processing gas G supplied to the storage tank 3 by, for example, changing the mixing ratio of the first processing gas G1 and the second processing gas G2 under conditions that satisfy the upper limit temperature of the supply air and the ventilation amount determined by the ventilation control unit 91. In addition, when controlling the relative humidity of the second processing gas G2, a humidifier / dehumidifier for humidifying or dehumidifying the second processing gas G2 may be provided on the second supply path 420 and controlled by the control unit 9.

[0077] In addition, when the second processing gas G2 is cooled by a heat exchanger or a humidifier provided on the second supply line 420, if the maximum temperature of the storage tank 3 approaches the upper limit of the bed temperature and it becomes necessary to lower the temperature in the tank, the ventilation control unit 91 may perform control to increase the ventilation speed of the second processing gas G2. This increases the ventilation speed of the processing gas G, making it possible to cool the deposits B.

[0078] Third Embodiment The configuration of the carbide production equipment 200 of the third embodiment is different from that of the carbide production equipment 200 of the second embodiment in the configuration of the first process gas supply mechanism 41. Description of the configuration similar to that of the second embodiment will be omitted.

[0079] 5, the first process gas supply mechanism 41 of the process gas supply mechanism 4 in the third embodiment has a bypass path 430 that supplies a portion of the air A to the storage tank 3. The bypass path 430 is formed by a pipe 431 that branches off from the gas supply path 70 upstream of the heat exchanger 50 and connects to the pipe 412. The pipe 431 connects to the pipe 412 downstream of the first humidifier 41a and upstream of the first fan 41b, but the pipe 431 may also be connected to the pipe 411 upstream of the first humidifier 41a. A regulating valve 43a that controls the flow rate of the air A flowing through the bypass path 430 may be disposed on the pipe 431. The regulating valve 43a is, for example, a regulating valve such as a butterfly valve whose opening degree is adjustable.

[0080] The pipes 411 and 431 may be provided with temperature sensors (not shown) for measuring the temperature of the air A or the white smoke prevention air. The temperature control unit 92 controls the adjustment valve 43a based on the temperatures of the air A and the white smoke prevention air measured by the temperature sensors, thereby changing the mixing amount of the air A not heated in the heat exchanger 50 and the white smoke prevention air heated in the heat exchanger 50, thereby controlling the gas temperature of the first processing gas G1. For example, the control unit 9 may reduce the aperture of the adjustment valve 43a to increase the gas temperature of the first processing gas G1, and may increase the aperture of the adjustment valve 43a to decrease the gas temperature of the first processing gas G1. Note that the adjustment valve 43a may be opened or closed so as to supply either the air A not heated in the heat exchanger 50 or the heated white smoke prevention air.

[0081] Fourth Embodiment The configuration of the carbide production equipment 200 of the fourth embodiment is different from that of the carbide production equipment 200 of the second embodiment in the configuration of the first processing gas supply mechanism 41. Description of the same configuration as that of the second embodiment will be omitted.

[0082] As shown in Fig. 6, the first processing gas supply mechanism 41 of the processing gas supply mechanism 4 in the fourth embodiment has an adjustment gas supply path 440 that supplies a temperature adjustment gas to the white smoke prevention air heated by the heat exchanger 50. The temperature adjustment gas in this embodiment is air A, but gas discharged from the processing system of the carbide production equipment 200 may also be used. The adjustment gas supply path 440 has a third fan 44b that takes in air A from the atmosphere and a pipe 441 that connects the third fan 44b and the pipe 411. A regulation valve 44a that controls the flow rate of air A may be disposed on the adjustment gas supply path 440. The regulation valve 44a is, for example, a regulation valve such as a butterfly valve whose opening degree can be adjusted.

[0083] The control unit 9 controls the gas temperature of the first processing gas G1 by controlling the adjustment valve 44a to change the mixture amount of air A and heated white smoke prevention air. To increase the gas temperature of the first processing gas G1, for example, the control unit 9 may reduce the aperture of the adjustment valve 44a, and to decrease the gas temperature of the first processing gas G1, the control unit 9 may increase the aperture of the adjustment valve 44a. Note that the adjustment valve 44a may be opened or closed so as to supply either air A or heated white smoke prevention air.

[0084] Fifth Embodiment The configuration of the carbide production equipment 200 of the fifth embodiment differs from that of the carbide production equipment 200 of the second embodiment in the configuration of the process gas supply mechanism 4. Description of the same configuration as that of the second embodiment will be omitted.

[0085] As shown in FIG. 7 , the processing gas supply mechanism 4 in the fifth embodiment includes a heater 61 for heating the processing gas G and a second humidifier 62 for humidifying the processing gas G, both located downstream of a connection point N between the first supply path 410 and the second supply path 420. The heater 61 is, for example, an electric heater or a gas heater. The heater 61 may also be a heat exchanger that exchanges heat with a heat medium heated using electricity, gas, or other fuel as an energy source. The second humidifier 62 may have a configuration similar to that of the first humidifier 41a. The first processing gas supply mechanism 41 may also include a bypass path 430 and an adjustment gas supply path 440 according to the third and fourth embodiments.

[0086] For example, when the operation of the carbonization furnace 10 or the secondary combustion furnace 12 is stopped and white smoke prevention air cannot be generated, the control unit 9 operates the heater 61 to adjust the gas temperature of the processing gas G to a predetermined temperature. (Even when the operation of the carbonization furnace 10 is stopped and the production of the carbide M is stopped, the carbide M in the storage tank 3 may require curing treatment by circulating the processing gas G through the storage tank 3 for a predetermined period.) In this case, the processing gas G is unheated air A supplied from the bypass path 430, or a first processing gas G1 and / or a second processing gas G2, which is air A supplied from the adjustment gas supply path 440. By heating the processing gas G to a predetermined temperature with the heater 61, the reaction of the carbide M in the storage tank 3 can be made more efficient.

[0087] The control unit 9 operates the second humidifier 62 to humidify the processing gas G so that the processing gas G has a predetermined humidity. When the second humidifier 62 operates, the first humidifier 41a does not need to operate. This is because if the gas temperature of the first processing gas G1 decreases due to the operation of the first humidifier 41a, the load on the heater 61 increases. The control unit 9 may control the second humidifier 62 in accordance with the measurement result of the humidity measurement unit H. Although the humidity measurement unit H is provided upstream of the second humidifier 62 in FIG. 7, the humidity measurement unit H may also be provided downstream of the second humidifier 62.

[0088] Other Embodiments The humidification water W used in the first humidifier 41a and the second humidifier 62 in the above embodiment may be heated by heat generated in the treatment system of the carbide production equipment 200. This allows the treatment gas G to be heated with more energy savings. [Industrial Applicability]

[0089] The present invention can be used in a carbide manufacturing facility equipped with a carbonization furnace for performing carbonization treatment. [Explanation of symbols]

[0090] 3: Reservoir 4: Processing gas supply mechanism 10: Carbonization furnace 41: First processing gas supply mechanism 41a: First humidifier 42: Second processing gas supply mechanism 50: Heat exchanger 61: Heater 62:Second humidifier 200: Carbide manufacturing equipment 430: Bypass route 440: Adjustment gas supply line A: Air Ef: Combustion exhaust G: Processing gas G1: First processing gas G2: Second processing gas M: Carbide W: Humidifying water (water)

Claims

1. a carbonization furnace for performing carbonization treatment; a storage tank for receiving the carbonized material produced in the carbonization furnace and performing a curing treatment thereon; a processing gas supply mechanism that supplies a processing gas to the storage tank, The processing gas supply mechanism supplies the processing gas, which has been heated using the heat of exhaust gas generated in a processing system, to the storage tank in the carbide manufacturing equipment.

2. the processing gas supply mechanism includes a first processing gas supply mechanism that supplies a first processing gas containing oxygen, and a second processing gas supply mechanism that supplies at least a portion of the second processing gas discharged from the storage tank; 2. The carbide manufacturing facility according to claim 1, wherein the processing gas includes the first processing gas and the second processing gas.

3. a discharge section that discharges the purified combustion exhaust gas into the atmosphere; a heat exchanger that heats air using the heat of the exhaust gas, the first processing gas contains at least a portion of white smoke prevention air for increasing the temperature of the combustion exhaust gas, The carbide manufacturing facility according to claim 2, wherein the white smoke prevention air is the air heated by the heat exchanger.

4. 4. The carbide manufacturing facility according to claim 3, wherein the first process gas supply mechanism has a first humidifier that humidifies the first process gas.

5. The carbide manufacturing facility according to claim 4, wherein the first humidifier reuses water used in the treatment system to humidify the first treatment gas.

6. 5. The carbide manufacturing facility according to claim 4, wherein the first process gas supply mechanism has a bypass passage for supplying the air to the storage tank.

7. The carbide manufacturing equipment according to any one of claims 2 to 6, wherein the processing gas supply mechanism comprises a heater for heating the processing gas and a second humidifier for humidifying the processing gas.

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