JP2013082892A - Manufacturing method and manufacturing system of carbonized material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a carbonized material capable of shortening the lead time for shipping as a product by solving problems of temperature rising of the humidified carbonized material during storage so as to reduce the storage space for improving the yield, and to provide a manufacturing system of a carbonized material.SOLUTION: The manufacturing system of a carbonized material 10 includes: a carbonization furnace 12 for generating the carbonized material by applying carbonization treatment to organic waste; a humidifier 14 for humidifying the carbonized material; and cooling devices 16a-16c for cooling the carbonized product which has been humidified by the humidifier 14 and is a product P immediately before shipping. The cooling devices 16a-16c include: cylinders 40 having inlets 40a for filling the carbonized material provided at an upper part, and outlets 40b allowing opening and closing for discharging the carbonized material after cooling provided at a lower part; a cooling tank 42 housing the cylinders 40 and capable of distributing coolant provided around the cylinders 40.

Description

  The present invention relates to a carbide manufacturing method and a carbide manufacturing system for humidifying a carbide obtained by carbonizing an organic waste, and shipping the humidified carbide as a product.

  In recent years, in order to effectively use organic waste such as sewage sludge, carbonization is performed on organic waste to produce carbide, and this carbide is used as a fuel for power generation.

  When using carbide in power generators, etc., just before putting it in the furnace of a pulverized coal boiler, the carbide is pulverized by a crusher such as a roller into fine powder. At that time, the carbide generates a lot of dust. However, it generates heat depending on the situation. Therefore, if necessary, a processor that carbonizes organic waste, humidifies the carbonized carbonized product, and ships it as a product (fuel) in a state of containing a certain amount of moisture. Generation and heat generation are prevented, and its handling is improved.

  Regarding such a method for producing carbide, Patent Document 1 discloses that the carbonized sludge (carbide) carbonized at 500 to 600 ° C. in a carbonization furnace is cooled to about 200 ° C. or less by a cooler, and then the first stage in the mixer. After the humidified carbonized sludge is cooled with a cooler such as an air-cooled direct type, it is temporarily stored in a sludge carbonized fuel storage tank, and further, with a mixer so that the water content is 5 to 15% by weight. A method of performing the second stage of humidification is disclosed. And in this patent document 1, the mixer which performs the humidification of the 2nd stage is for adjusting the moisture content of carbonization sludge finally, before loading on a transport vehicle, and makes this moisture content. Therefore, it is described that carbonized sludge can be prevented from scattering and heat generation can be suppressed.

JP 2005-344099 A

  By the way, according to the experiments of the present inventors, when the carbide finally humidified to about 5 to 15% by weight is stored as it is in a storage facility such as a hopper as in Patent Document 1 above. It has been clarified that the carbides generate heat in the hopper, and for example, those of about 10 to 20 ° C. before being charged rise to about 50 to 70 ° C. after several hours.

  However, the method described in Patent Document 1 employs a method of humidifying the moisture content to 5 to 15% by weight before final shipment as a carbide product, and storing and shipping the humidified carbide as it is. Therefore, there is a concern that the carbide generates heat up to about 50 to 70 ° C. after the final humidification step (second stage humidification). Therefore, in this prior art, after the final humidification process, it is necessary to store for a long time until the temperature of the heated carbide is stabilized, the storage time until shipping is extended, the storage space increases, the yield decreases, etc. Will cause problems. Furthermore, there is a concern that during the long-term storage, the temperature of the carbide rises again, causing an unexpected thermal runaway. In addition, when shipped as a product without sufficiently stabilizing the temperature of the carbide, there is a concern that the temperature will rise after the product is shipped.

  The present invention has been made in consideration of the above-mentioned conventional problems, can stabilize the humidified carbides early, can shorten the storage time until shipping as a product, reduce the storage space, It is an object of the present invention to provide a carbide manufacturing method and a carbide manufacturing system capable of improving the yield.

  A method for producing a carbide according to the present invention is a method for producing a carbide for humidifying a carbide obtained by carbonizing an organic waste, and shipping the humidified carbide as a product. After performing the last final humidification process, the cooling process which cools the carbide | carbonized_material humidified by this humidification process is performed, It is characterized by the above-mentioned.

  According to such a method, since the heat generation of the carbide after the final humidification step before shipment can be effectively suppressed, the temperature of the carbide after humidification can be quickly increased to a temperature range where the product can be shipped. Can be lowered. For this reason, the storage time until the humidified carbide is shipped as a product can be shortened, the storage space can be reduced, and the yield can be improved.

  In the cooling step, the carbide may be cooled while air is purged by supplying air into a cooling container containing the carbide. If it does so, since oxidation of a carbide | carbonized_material can be accelerated | stimulated at the time of a cooling process and a carbide | carbonized_material can be stabilized, the oxidation reaction after product shipment can be suppressed and a temperature rise can be prevented.

  When the step of stirring the carbide is performed after the cooling step, the temperature state of the humidified carbide can be equalized and the carbide can be further stabilized. In this case, if the step of stirring is a circulation step in which the carbide is replaced and circulated in the vertical direction in the tank storing the carbide, the temperature state of the carbide can be more equalized.

  In the step of stirring, the carbide may be stirred while supplying air into a tank of a storage facility containing the carbide and performing air purge. If it does so, oxidation of a carbide | carbonized_material can be accelerated | stimulated also at the time of the process which stirs a carbide | carbonized_material.

  After the step of stirring, in the storage facility containing the carbide, a storage step for storing for a certain time longer than the cooling time in the cooling step is performed, and then immediately before shipping the carbide as a product, the storage facility If the step of stirring the carbide again is performed, the temperature of the humidified carbide can be stabilized at a lower temperature before shipment.

  The cooling step is preferably performed within 2 to 4 hours after the humidification step. That is, since the humidification heat generation of the carbide has a reaction time of about 2 hours, even if cooling is too early, heat is generated at the subsequent stage storage, and if it is too late, heat is generated before cooling, so within 2 to 4 hours after the humidification step. By performing the cooling step, it is possible to avoid the temperature of the humidified carbide from rising again and causing thermal runaway.

  The cooling step is preferably performed by an indirect cooling method in which a cooling liquid is circulated around the cooling vessel filled with the carbide because it can prevent the moisture content and properties of the humidified carbide from being affected.

  The carbide production system according to the present invention includes a carbonization furnace that carbonizes organic waste to produce carbide, a humidifier that humidifies the carbide, and a final product before shipping as a product in the humidifier. And a cooling device that cools the carbide that has been humidified.

  According to such a configuration, the carbide before shipping as a product can be cooled immediately after humidification to suppress the temperature rise, so the storage time until the humidified carbide is shipped as a product can be shortened, and the storage space is reduced. In addition, the yield can be improved.

  The cooling device may include an air supply port that supplies air into a cooling container that houses and cools the carbide to perform air purge. If it does so, the oxidation of a carbide | carbonized_material can be accelerated | stimulated at the time of cooling, and the state of a carbide | carbonized_material can be stabilized more.

  A hopper for storing carbide cooled by the cooling device is provided, and when the hopper is provided with a stirring device for stirring the carbide stored inside, the temperature state of the carbide in the hopper is equalized. And the state of carbide can be further stabilized. In this case, it is preferable that the agitation device is a circulation device having a circulation path that circulates the carbide in the hopper in the vertical direction because the carbide can be evenly agitated in the hopper.

  The cooling container is a cylindrical body provided with an inlet for filling the carbide at the upper part and an openable / closable outlet for discharging the carbide after cooling at the lower part. When the cylinder is accommodated and provided with a cooling tank capable of circulating the coolant around the cylinder, the carbide can be effectively cooled by the indirect cooling method.

  When a plurality of the cylinders are provided in the cooling tank, the heat dissipation area of the cylinders can be increased and the cooling efficiency can be improved.

  The inlet of each cylinder opens at the upper surface of the top plate that closes the upper part of the cooling tank, and the uncooled carbide charged in the upper surface of the top plate is leveled and filled into the inlet of each cylinder. When the leveling device is provided, the carbide can be uniformly and rapidly filled into each cylinder.

  If a discharge accelerating device that applies an impact to the lower portion of the cylindrical body and promotes the discharge of carbide from the outlet, clogging of the carbide at the outlet of the cylindrical body can be prevented.

  The cooling device is connected to a hopper that stores carbide discharged from the cooling device, and the carbide manufacturing system includes a plurality of cooling storage facilities that connect the cooling device and the hopper, The plurality of cooling storage facilities are connected in order from the humidifier side in the carbide transport direction to the carbide transport line carried out from the humidifier, and the carbide discharged from the cooling storage facility is transferred to the transport line. When the second transport line that can be supplied to the cooling storage facility connected to the upstream side in the transport direction of the carbide in is equipped with the second transport line, the carbide that has passed through the transport line without entering the upstream cooling storage facility can be Can be put into the cold storage facility. Thus, for example, when performing the final curing process of humidified carbide in the upstream cooling storage facility, the humidified carbide before cooling is erroneously input to the upstream cooling storage facility performing the final curing process. Can be prevented.

  According to the present invention, the heat generation of the carbide after the final humidification step before shipment can be effectively suppressed, so that the temperature of the carbide after humidification is quickly lowered to a temperature range where the product can be shipped as a product. Can be made. For this reason, the storage time until the humidified carbide is shipped as a product can be shortened, the storage space can be reduced, and the yield can be improved.

FIG. 1 is a graph showing the relationship between elapsed time and temperature change after humidifying carbides. FIG. 2 is an overall configuration diagram of a carbide production system according to an embodiment of the present invention. FIG. 3 is a partial cross-sectional side view of the cooling device. 4 is a cross-sectional view taken along line IV-IV in FIG. FIG. 5 is a partial cross-sectional side view showing a configuration of a hopper having a circulation path.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a carbide manufacturing method according to the present invention will be described in detail with reference to the accompanying drawings by giving preferred embodiments in relation to a manufacturing system that performs this method.

  First, prior to the description of the carbide manufacturing method and manufacturing system according to this embodiment, the temperature change of the carbide after humidification will be described with reference to the experimental data shown in FIG.

  FIG. 1 is a graph showing the relationship between elapsed time (h) and temperature change (° C.) after carbide is humidified. In the experiment of FIG. 1, the carbide obtained by carbonizing sludge (organic waste) in a carbonization furnace at about 500 ° C. is humidified to about 10% by weight, and the humidified carbide that is the humidified carbide is subjected to various conditions. It is stored for 20 hours or more below, and the temperature change of the humidified carbide at that time is measured.

  Of the three graphs showing the temperature change in FIG. 1, “no cooling” means that the carbide is stored in the hopper as a storage facility immediately after humidification, and “cooling (1)” and “cooling ( "2)" is a case where the carbide is stored in the hopper after being cooled for a predetermined time (2 hours) immediately after humidification. In “Cooling (1)” and “Cooling (2)”, experiments were conducted using an indirect cooling type cooling device in which cooling water was circulated on the peripheral surface of a steel pipe filled with humidified carbide. “Cooling (1)” is an experimental result using a steel pipe having a diameter of 200 mm, and “Cooling (2)” is an experimental result using a steel pipe having a diameter of 250 mm.

  As shown in FIG. 1, in the case of “no cooling”, what was about 13 ° C. immediately after humidification started to generate heat immediately after humidification, and after rising to about 73 ° C. within 2 hours, the temperature gradually increased. It is falling. In the case of “no cooling”, for example, the high temperature close to 60 ° C. is maintained even after 6 hours. Therefore, for example, when the shipping temperature of the humidified carbide is set to 40 ° C. or less, the humidified carbide is used as a product. Before shipping, it is necessary to store in a hopper for at least 14 hours after humidification, which causes an increase in storage space and a decrease in yield.

  On the other hand, in the case of “cooling (1)” and “cooling (2)”, both were about 13 ° C. immediately after humidification, but started to generate heat immediately after humidification and were about 65 ° C. within one hour. However, the temperature starts to drop immediately, and after 4 to 5 hours, all are 40 ° C. or less, and can be shipped quickly thereafter.

  From the above experimental results, in the case of “no cooling”, that is, simply storing the carbide after humidification, the carbide continues to rise in temperature for about 2 hours after humidification, and the maximum temperature is 50 to 60 ° C. from the initial temperature. It turns out that it rises to some extent. Furthermore, since the temperature of carbide continues to rise for about 2 hours after humidification, it is humidified by cooling with a cooling device for about 2 hours immediately after humidification, as in “Cooling (1)” and “Cooling (2)”. It has been found that the carbide just after can be cooled effectively and the temperature can be quickly lowered to a temperature range where shipping can be performed. In addition, this tendency was the same also about the carbide | carbonized_material based on multiple types of sludge from which a state differs.

  Next, the carbide manufacturing system according to the present embodiment will be described.

  FIG. 2 is an overall configuration diagram of a carbide production system 10 according to an embodiment of the present invention. The carbide manufacturing system 10 according to the present embodiment (hereinafter also simply referred to as “manufacturing system 10”) carbonizes organic waste such as sewage sludge in the carbonization furnace 12, and the resulting carbide (carbonized product) is obtained. This is a system for manufacturing a product (humidified carbide) by humidifying the humidified carbide (humidified carbonized product) with the cooling devices 16a to 16c after humidifying with the humidifier 14, and the manufactured product is, for example, a power plant To be used as fuel for power generators.

  As shown in FIG. 2, the manufacturing system 10 includes a carbonization furnace 12 that carbonizes organic waste such as sewage sludge, and a humidifier that humidifies the carbide that is carbonized in the carbonization furnace 12 and conveyed by the cooling conveyor 18. 14, cooling devices 16 a to 16 c that cool the humidified carbide that is humidified by the humidifier 14 and transported by the first transport line 20, and hoppers 22 a to 22 c that store the humidified carbide cooled by the cooling devices 16 a to 16 c Is provided.

  As an example of the operation method of the manufacturing system 10 according to the present embodiment, hereinafter, the central cooling device 16b is not normally operated as a preliminary cooling means, and is cooled by two cooling devices 16a and 16c provided on both sides. Next, the humidified carbides stored in the hoppers 22a and 22c are then introduced into the hopper 22b, stored and cured while circulating in the hopper 22b, and then shipped as a product. Of course, the manufacturing system 10 can be operated by various methods such as cooling the humidified carbides in all the cooling devices 16a to 16c, storing them in the hoppers 22a to 22c, and shipping them.

  The carbonization furnace 12 is a known external heat type rotary kiln, and organic waste (dried product) dried from the inlet 12a is put into the furnace, and nitrogen is heated to about 400 to 800 ° C, preferably about 600 ° C. Heating and carbonization is performed while purging to generate carbides, and the carbides are discharged from the discharge port 12 b to the cooling conveyor 18. By setting the carbonization temperature to about 500 to 600 ° C., the carbide has a property that it is difficult to run away due to self-heating. Of course, the furnace system of the carbonization furnace 12 is not particularly limited, and may be other than the indirect heating kiln system such as the rotary kiln. For example, a fluidized carbon furnace may be used.

  The cooling conveyor 18 conveys the high-temperature carbide sent from the discharge port 12b of the carbonization furnace 12 through the double gate 17 to the humidifier 14 in the next process while cooling it by an indirect cooling method using a heat sink or the like. For example, the carbide of about 600 ° C. received from the carbonization furnace 12 is cooled to about 40 ° C. and is put into the humidifier 14.

  The humidifier 14 is a humidifying means for adding a predetermined amount of moisture to the carbide charged from the cooling conveyor 18. For example, water is sprayed while stirring the carbide with a paddle or a screw, and the charged carbide is 5 to 15. After being humidified to about wt%, preferably about 12 wt%, it is discharged to the first transport line 20. By setting the humidification ratio to the carbide to about 12% by weight, dust scattering at the product receiving facility (product shipping destination) can be appropriately suppressed.

  The 1st conveyance line (conveyance line) 20 is a conveyance means for conveying the humidified carbide discharged | emitted from the humidifier 14 to cooling device 16a-16c. The first transport line 20 is configured by a known flight conveyor or the like, and includes a first transport conveyor 24 that transports the humidified carbide received from the humidifier 14, and three humidified carbides transported by the first transport conveyor 24. A first input conveyor 26 that can be selectively input to each of the devices 16 a to 16 c is provided, and a waste line 28 is connected between the first transfer conveyor 24 and the first input conveyor 26.

  During normal operation, the first input conveyor 26 is configured to alternately input humidified carbide from the two input ports 26a and 26c (see solid arrows 26a and 26c in FIG. 2) to the two cooling devices 16a and 16c. It is a conveyor extending in the direction. A cooling device 16a, a cooling device 16b, and a cooling device 16c are connected to the first input conveyor 26 in order from the humidifier 14 side, which is the upstream side in the conveying direction of the carbides, toward the downstream side. During normal operation, the humidified carbide from the first transfer line 20 is charged into the cooling devices 16a and 16c on both sides, and the charging port 26b to the cooling device 16b (see the arrow 26b indicated by the one-dot chain line in FIG. 2) is closed. ing.

  The waste line 28 is insufficiently cooled by the downstream cooling devices 16a to 16c or the like when there is a defect such as a carbonization failure or a humidification failure in the carbonization furnace 12 or the humidifier 14 on the upstream side of the first transfer line 20. When there is a problem, the humidified carbide that is no longer needed is discharged outside and discarded.

  The cooling devices 16a to 16c cool the humidified carbide transported by the first transport line 20 for a predetermined time by the indirect cooling method, and then discharge it to the hoppers 22a to 22c. The specific configuration will be described later. To do. During normal operation, of the three cooling devices 16a to 16c, two cooling devices 16a and 16c connected to the inlets 26a and 26c of the first input conveyor 26 are operated, and the central cooling device 16b is Not driving.

  The hoppers 22a and 22c are storage facilities for temporarily storing the humidified carbides cooled by the cooling devices 16a and 16c, and are integrally connected to the lower portions of the cooling devices 16a and 16c, respectively, together with the cooling devices 16a and 16c. It constitutes a cooling storage facility. The hoppers 22a and 22c have a storage capacity larger than the cooling capacity (filling capacity) of the humidified carbide in the cooling devices 16a and 16c. The humidified carbide stored in the hoppers 22a and 22c is supplied to the second transport line (return line) 32 (or transported) via the circle feeders 30a and 30c, which are powder supply units connected to the bottoms of the hoppers 22a and 22c. To the car 34).

  The hopper 22b installed between the hoppers 22a and 22c is temporarily stored in the hoppers 22a and 22c, and stores and cures the humidified carbide introduced through the second transport line 32, and the stored humidified carbide is circulated in the circulation path 35. Is a storage facility (circulation curing facility) that is circulated by the hopper, and has a storage capacity similar to that of the hoppers 22a and 22c. Like the hoppers 22a and 22c, the hopper 22b is integrally connected to the lower portion of the cooling device 16b to constitute a cooling storage facility. However, when the cooling device 16b as a preliminary cooling means is omitted, The hopper 22b is connected to the second transport line 32 as a single storage facility.

  The 2nd conveyance line 32 is a conveyance means for returning the humidified carbide | carbonized_material supplied from the circle feeders 30a-30c to the cooling devices 16a-16c. The 2nd conveyance line 32 is constituted by publicly known flight conveyors, etc., and the 2nd conveyance conveyor 36 which can convey humidification carbide received from circle feeders 30a-30c, and 3 humidification carbide conveyed by the 2nd conveyance conveyor 36 And a second charging line 38 that can be selectively charged to each of the cooling devices 16a to 16c.

  During normal operation, the second charging line 38 is a second charging of the humidified carbide cooled by the cooling devices 16a and 16b and conveyed by the second conveyor 36, as indicated by solid arrows 37a and 37c in FIG. From the opening 38b (see the solid arrow 38b in FIG. 2), the chiller 22b is charged through the auxiliary cooling device 16b. During this normal operation, the cooling operation in the cooling device 16b is not performed, and the humidified carbide cooled by the cooling devices 16a and 16c is transferred to the hopper 22b by the second transfer line 32, stored and cured, and circulated. After being appropriately circulated by the path 35, the product P is carried into the transport vehicle 34 from the circle feeder 30b (see the solid line arrow 39b in FIG. 2).

  Next, an example of a specific configuration of the cooling devices 16a to 16c will be described with reference to FIGS. In the case of the present embodiment, since the three cooling devices 16a to 16c have the same structure, the cooling device 16a will be representatively described below. Of course, the cooling devices 16a to 16c may have different structures, and in this embodiment, the cooling operation in the central cooling device 16b is not performed, so the cooling device 16b may be omitted. .

  As shown in FIGS. 3 and 4, the cooling device 16 a (16 b, 16 c) accommodates and arranges a plurality of cylinders (cooling containers) 40 filled with humidified carbide in a cooling tank 42. A cooling unit 44 for cooling the humidified carbide, a charging unit 46 connected to the upper part (upstream side) of the cooling unit 44, and a discharge unit 48 connected to the lower part (downstream side) of the cooling unit 44.

  The cooling unit 44 includes a plurality of cylinders 40 in which an inlet 40a for filling humidified carbide before cooling is formed at the upper end, and an outlet 40b for discharging humidified carbide after cooling is provided at the lower end. Each cylinder 40 is stored and arranged in an upright posture, and a cooling tank 42 capable of circulating a coolant (for example, cooling water) around these cylinders 40 is provided.

  The cylindrical body 40 is a heat radiating pipe made of, for example, a stainless steel pipe, and its upper part is fitted into a hole 50a formed through the top plate 50 that closes the upper part of the cooling tank 42, and its lower part closes the bottom of the cooling tank 42. The bottom plate 52 is fitted into a hole 52 a formed through the bottom plate 52 and fixed in the cooling bath 42. By providing a plurality of cylinders 40 as described above, the heat radiation area (total area of the outer peripheral surface of each cylinder 40) can be increased, and the cooling efficiency can be improved.

  The inlet 40a at the upper end of the cylindrical body 40 is opened at a position that is flush or substantially flush with the upper surface of the top plate 50, so that the humidified carbide charged into the upper surface of the top plate 50 is supplied to the charging unit. Each of the cylinders 40 is equally filled by 46 leveling devices 54. On the other hand, the outlet 40 b at the lower end of the cylindrical body 40 is inserted through the hole 52 a and opens slightly below the bottom plate 52, and the outlet 40 b can be opened and closed by the opening / closing damper device 56 of the discharge portion 48. Yes.

  The cooling tank 42 is a cylindrical water tank whose upper and lower portions are closed by a top plate 50 and a bottom plate 52, respectively, an inlet port 42a is provided on the lower side surface, and an outlet port 42b is provided on the upper side surface. A heat insulating material (heat insulating material) 43 is provided on the outer peripheral surface of the cooling tank 42.

  In the cooling tank 42, three horizontal partition plates 58 a to 58 c that partition in the vertical direction are arranged so that the respective end portions are staggered in the vertical direction. Each partition plate 58a to 58c is defined as a flow path that meanders upward in the cooling tank 42 between the inlet port 42a and the outlet port 42b. Thereby, the cooling liquid (for example, cooling water) flowing into the cooling tank 42 from the inlet port 42a is distributed around each cylinder 40 and cooled by the partition plates 58a to 58c while cooling the cylinder 40. It flows along the formed flow path and flows out from the outlet port 42b.

  The charging unit 46 is for charging the humidified carbide introduced from the first charging conveyor 26 of the first transport line 20 into the cooling unit 44, and has a cylindrical housing 62 connected to the upper part of the cooling tank 42. , An introduction port 62 a for introducing humidified carbide into the internal space of the housing 62, and a leveling device 54 disposed in the internal space of the housing 62. The introduction port 62a is connected to the input port 26a (26b, 26c) of the first input conveyor 26.

  The leveling device 54 is introduced into the internal space of the housing 62 from the introduction port 62a, and the humidified carbide deposited on the upper surface of the top plate 50 is leveled in the horizontal direction and uniformly filled into the inlets 40a of the respective cylinders 40. It is a device for doing. The leveling device 54 includes a horizontal rotary bar 66 suspended by a rotary shaft 64 in a housing 62, a plurality of wings 68 projecting from the lower surface of the rotary bar 66 to the upper surface of the top plate 50, and a rotary shaft. And a drive mechanism 70 for rotationally driving the rotary bar 66 via 64.

  The wings 68 are thin flat plates along the vertical direction. As shown in FIG. 4, in the case of this embodiment, the two wings 68a and 68b at both ends of the eight wings 68 rotate. The two wings 68 are attached to both ends of the bar 66 so as to be slightly inclined with respect to the axial direction of the rotating bar 66, and the remaining six wings 68 are more than the wings 68 a and 68 b with respect to the axial direction of the rotating bar 66. It is installed with a large inclination.

  The drive mechanism 70 is disposed in the upper part of the housing 62, and supports the motor 72, a gear mechanism (deceleration mechanism) 74 for transmitting the driving force from the motor 72 to the rotation shaft 64, and the rotation shaft 64. Bearings 76a and 76b.

  Therefore, when the motor 72 is driven and the rotating shaft 64 is driven to rotate, the rotating bar 66 is also driven to rotate around the central portion in the longitudinal direction. Then, as apparent from FIG. 4, each blade 68 functions as a scraper that smoothes the humidified carbide accumulated on the top surface of the top plate 50, and the humidified carbide leveled by each blade 68 is each tube 40. Are uniformly and rapidly filled into the inlet 40a.

  The discharge part 48 is for discharging the humidified carbide cooled in the cylindrical body 40 to the hopper 22a (22b, 22c) which is a storage facility, and is a cylindrical housing connected to the lower part of the cooling tank 42. 80 and an open / close damper device 56 disposed in the internal space of the housing 80.

  An air supply port 81 for supplying air (air) into the housing 80 and purging the inside of the cylinder body 40 and the hoppers 22a (22b, 22c) is provided on the side wall surface of the housing 80. An air compressor or the like (not shown) is connected to the air supply port 81. Therefore, in the cooling devices 16a to 16c, the humidified carbide is cooled in an air atmosphere (oxygen atmosphere) while purging the inside of the cylindrical body 40, whereby oxidation of the carbide can be promoted and the temperature can be stabilized. Furthermore, in the hopper 22b that performs the final curing, the carbide can be evenly stirred in the tank by performing a circulation process using the circulation path 35 while curing the humidified carbide in an air atmosphere, and the temperature in the tank can be increased. It is possible to further stabilize the temperature by further promoting the oxidation of the carbide while averaging to prevent heat storage. That is, by performing an air purge during the cooling process and the circulation process, the oxidation of the carbide can be promoted, and the temperature rise due to the oxidation reaction after shipment as a product can be reduced as much as possible.

The amount of air purge from the air supply port 81 may be appropriately set according to the outside air temperature, the cooling capacity of the cooling devices 16a to 16c, the storage capacity of the hoppers 22a to 22c, etc. For example, in this embodiment, 5 to 15 m ^3. / H, preferably about 10 m ³ / h.

  The opening / closing damper device 56 divides the entire cylindrical body 40 into four blocks, and opens / closes lids 82 (see FIG. 4) that collectively open and close the outlets 40b of the cylindrical bodies 40 of the blocks, and the opening / closing lids around the rotation shaft 84. And a motor 86 for rotating 82. Each opening / closing lid 82 is linked to both ends in the axial direction of the rotation shaft 84, and the four opening / closing lids 82 are opened / closed at a time by two motors 86 respectively disposed on both ends of the rotation shaft 84. Is done.

  As shown in FIG. 3, for example, by giving an impact to the bottom plate 52, the side portion of the discharge portion 48 gives an impact to each tubular body 40 fitted to the bottom plate 52. A post-striking device (discharge promotion device) 88 that promotes the discharge of the humidified carbide from is provided. Should the opening / closing lid 82 be opened, the humidified carbide after cooling in the cylinder 40 cannot be discharged smoothly and the outlet 40b is clogged in a bridge shape. Thus, an impact can be applied to the vicinity of the outlet 40b of each cylindrical body 40, and the discharge thereof can be smoothed.

  Next, an example of a specific configuration of the hopper 22b having the circulation path 35 will be described with reference to FIG. In the present embodiment, the circulation path 35 is provided only in the central hopper 22b. However, depending on the operation method of the manufacturing system 10, it may be provided in the other hoppers 22a and 22c.

  As described above, the hopper 22b is for storing and curing the humidified carbide cooled by the cooling devices 16a and 16c immediately before shipment. The humidified carbide stored in the tank is replaced and circulated up and down in the tank. A circulation path 35 is provided.

  The circulation path 35 is connected to the lower part of the hopper 22b, and is connected to the carry-out path 35a for carrying out the humidified carbide in the hopper 22b, and to the upper part of the hopper 22b, and the humidified carbide pulled up from the carry-out path 35a by the conveyor 35b It is a circulation device provided with a charging path 35c that is charged into the hopper 22b from above. In the present embodiment, the carry-out path 35a is connected to the circle feeder 30b and the input path 35c is connected to the side surface of the housing 80. However, the carry-out path 35a may be connected to the bottom surface or side surface of the container of the hopper 22b. The charging path 35c may be connected to the side surface or the upper surface of the container of the hopper 22b. The conveyor 35b may be configured by a known flight conveyor or the like.

  Accordingly, in the circulation path 35, the humidified carbide stored in the hopper 22b is extracted from the bottom-side carry-out path 35a, conveyed by the conveyor 35b, and again fed into the hopper 22b from the top-side input path 35c. The humidified carbide can be exchanged and circulated in the vertical direction inside the hopper 22b. At this time, since air is supplied into the tank of the hopper 22b from the air supply port 81, the humidified carbide inside the hopper 22b can be circulated while purging with air.

  Next, the manufacturing method of the carbide | carbonized_material using the manufacturing system 10 comprised as mentioned above is demonstrated.

  First, a dried product of organic waste such as sewage sludge is carbonized at a predetermined temperature (for example, 600 ° C.) by a carbonization furnace 12 (carbonization process), and the resulting carbide is humidified by a humidifier 14 via a cooling conveyor 18. Introduce to. In the humidifier 14, humidification is performed until the carbide reaches a predetermined moisture content (for example, 12% by weight) to generate humidified carbide (humidification process).

  Subsequently, during normal operation of the manufacturing system 10, the humidified carbide generated by the humidifier 14 is quickly conveyed by the first conveyance line 20 and is alternately charged from the first input conveyor 26 to the cooling devices 16 a and 16 c. To be cooled.

  For example, first, humidified carbide is introduced into the cooling device 16a from the inlet 26a of the first input conveyor 26. In this cooling device 16a, the humidified carbide is introduced into each cylinder 40 under the driving action of the leveling device 54. Filled (filling step). At this time, the outlet 40 b of the cylindrical body 40 is closed by the opening / closing lid 82 of the opening / closing damper device 56. When filling of the humidified carbide into the cylinder 40 of the cooling device 16a is completed, a circulation pump and a cooling chiller (not shown) connected to the cooling tank 42 of the cooling device 16a are driven, and the outlet port 42b is connected from the inlet port 42a. At the same time, an air compressor or the like (not shown) is driven to supply air from the air supply port 81. Thereby, the cooling process (cooling residence) which cools the humidified carbide | carbonized_material in the cylinder 40 which is a cooling container, air purging is performed, and cooling of humidified oxide and promotion of the self-heating by oxidation are performed. This cooling process is performed for about 2 to 4 hours based on the experimental data of FIG. 1, for example.

  Simultaneously with the start of the cooling operation (cooling process) in the cooling device 16a, the humidified carbide is charged into the cooling device 16c from the charging port 26c, and into each cylinder 40 under the driving action of the leveling device 54. The humidified carbide is filled (filling step). That is, during the cooling process of the cooling device 16a previously filled with the humidified carbide for about 2 to 4 hours, the humidifying carbide filling step into the cylinder 40 of the cooling device 16c is performed, so that the operating efficiency of each device is improved. Can be increased.

  When the cooling process in the cooling device 16a is completed, the filling process in the cooling device 16c is also completed. In the cooling device 16a, the opening / closing damper device 56 is driven to open the opening / closing lid 82 (see the opening / closing lid 82 shown by a two-dot chain line in FIG. 3). The humidified carbide after cooling is discharged into the hopper 22a (discharge process). Thereafter, a filling process is performed in which new humidified carbide conveyed from the first input conveyor 26 is again filled into the cylinder 40 of the cooling device 16a, and during the discharging process and the filling process in the cooling device 16a. In the cooling device 16c, a cooling process is performed.

  After that, the cooling device 16a and the cooling device 16c alternately perform the filling process and the cooling process (and the discharging process), so that the two cooling devices 16a and 16c can be connected without stopping the operation of the system. The cooling process of the used humidified carbide is continuously performed, and the humidified carbide after cooling is sequentially put into the hoppers 22a and 22c.

  In the cooling devices 16a and 16c, the cooling process is performed over 2 to 4 hours. At this time, the carbide temperature is reduced to, for example, 40 to 50 ° C. or less by cooling and reducing the temperature increase due to the oxidation reaction of the humidified oxide by the air purge. And The hoppers 22a and 22c store and cure while monitoring the temperature rise of the humidified carbide after cooling. When the amount of storage reaches a predetermined amount (for example, 6 tons) or more, the second transport from the circle feeders 30a and 30c. The humidified carbide is discharged to the second conveying conveyor 36 in the line 32 (see solid arrows 37a and 37c in FIG. 2). The cooled humidified carbide discharged to the second conveyor 36 is supplied from the second input port (re-input port) 38b to the central cooling device 16b via the second input line 38.

  Since the humidified carbide charged in the cooling device 16b is sufficiently cooled by the cooling process in the cooling devices 16a and 16c, the cooling device 16b is discharged to the hopper 22b without being operated. For example, the hopper 22b The humidified carbide corresponding to the shipping amount for one day (for example, 12 tons) is stored.

  In the hopper 22b, when humidified carbide corresponding to the daily shipment amount (for example, 12 tons) is collected and stored, the humidified carbide for one time with the tank capacity (for example, 12 tons) is supplied to the air supply port. While being oxidized by the air purge from 81, replacement circulation (oxidation circulation) is performed by the circulation path 35 (circulation step). Thereafter, the heat storage temperature in the hopper 22b is monitored by a temperature sensor (not shown). If the temperature is lower than the predetermined temperature, curing is continued as it is. If the predetermined temperature is exceeded, the circulation operation by the circulation path 35 is performed again to store the heat storage. While preventing, for example, curing for 8 hours (final curing, curing process) is performed.

  Then, taking into account the timing of shipment, the tank volume is replaced and circulated by the circulation path 35 (for example, a total of 24 tons) in the tank volume immediately before shipment through the circulation path 35 (recirculation step), and then a predetermined temperature (for example, 45 C.) The humidified carbide stable below is shipped as the product P, for example, by the transport vehicle 34 (see the solid line arrow 39b in FIG. 2).

  Of course, it is also possible to ship the humidified carbide after cooling stored in the hoppers 22a and 22c as the product P directly from the hoppers 22a and 22c without being circulated by the second transfer line 32 (1 in FIG. 2). (Refer to the product P indicated by the dotted line arrows 39a and 39c and the one-dot chain line).

  In addition to the normal operation, the manufacturing system 10 can perform other operation patterns based on a difference in conditions such as the temperature and the processing amount of the humidified carbide.

  For example, when all of the three cooling devices 16a to 16c are operated to produce humidified carbide, the inlet 26b of the first input conveyor 26 of the first transfer line 20 (the one-dot chain line arrow in FIG. 2). 26b), the product P can be shipped sequentially from the hoppers 22a to 22c by appropriately performing the filling process and the cooling process in the three cooling devices 16a to 16c. In this case, the circulation path 35 may be installed not only in the hopper 22b but also in the hoppers 22a and 22c, and each of the hoppers 22a to 22c may perform humidification carbide oxidation circulation and replacement circulation.

  Moreover, you may use the 2nd insertion port (re-injection port) 38a, 38c shown by the dashed-dotted arrow 38a, 38c in FIG. 2, and these 2nd insertion ports 38a, 38c are circle feeders 30a-30c, for example. The humidified carbide supplied to the second transport conveyor 36 is insufficiently cooled and may be used when the temperature is high. Furthermore, as shown by a one-dot chain line arrow 37b in FIG. 2, the humidified carbide discharged from the cooling device 16b can be put into the second transport conveyor 36 and recirculated to the cooling devices 16a to 16c.

  As described above, according to the method for manufacturing a carbide according to the present embodiment, when the carbide obtained by carbonizing the organic waste is humidified and the humidified carbide is shipped as a product, the shipment of the carbide is performed. After performing the previous final humidification step, a cooling step is performed to cool the carbide (humidified carbide) humidified by the humidification step. Thereby, the heat_generation | fever of the carbide | carbonized_material after the final humidification process before shipment can be suppressed effectively (for example, refer to each graph of "cooling (1)" and "cooling (2)" in FIG. 1). Since the storage time until the humidified carbide is shipped as a product can be shortened, the storage space can be reduced and the yield can be improved. That is, in the manufacturing method, the temperature of the humidified carbide is quickly reduced to a low temperature quickly by performing a cooling process for cooling the humidified carbide immediately after the humidification process performed immediately before shipping as a product. Shipping can be made possible.

  In addition to performing only one step by the humidifier 14 as described above, the humidification step is performed, for example, after the first humidification step is performed on the carbide, and then cooled by a predetermined cooling device, and then the second step. You may make it perform said cooling process, after optimizing the moisture content in carbide | carbonized_material by the final humidification process before shipment. In other words, the number of humidification processes and cooling processes is not limited, but at least after the final humidification process before shipping as a product, it is necessary to perform the cooling process. By performing, it becomes possible to ship the humidified carbide as a product quickly.

  In the cooling step, the carbide may be cooled while air is purged by supplying air from the air supply port 81 into the cylindrical body 40 which is a cooling container containing humidified carbide. In other words, even when the humidified carbide is immediately cooled and then shipped as a product, the product may cause slight heat generation depending on the outside air temperature, etc. There is a possibility that the temperature rises due to the oxidation reaction at the place of use. Therefore, by performing air purge during the cooling process to promote the oxidation of the carbide, the oxidation reaction after product shipment can be suppressed, and the temperature rise caused thereby can be avoided as much as possible. At this time, the heat generated by the oxidation reaction in the air purge can be quickly removed by the cooling process, so that the temperature of the humidified carbide does not rise excessively, and the temperature is reliably stabilized at a desired low temperature. Can do.

  After the cooling process, the cooled humidified carbide may be transferred to the hopper 22b via the second transport line 32, and a circulation process may be performed in which the humidified carbide is replaced and circulated in the tank of the hopper 22b using the circulation path 35. . That is, the humidified carbide stored and cured in the tank of the hopper 22b is cooled in an oxidizing atmosphere in the cooling devices 16a and 16c, and temporarily stored and cured in the hoppers 22a and 22c. Although it is in a stable state, there is a possibility that heat will be generated or stored in the hopper 22b to raise the temperature. Therefore, when the humidified carbide that has undergone the cooling process is stored and cured in the hopper 22b, for example, the circulation process is performed using the circulation path 35 so that one portion of the stored amount is replaced, thereby humidifying the hopper 22b. While equalizing the temperature state of the carbide, a further oxidation reaction can be caused to further stabilize the temperature state.

  Note that the carbide circulation process using the circulation path 35 may be performed in a place other than the hopper 22b introduced via the second transfer line 32. For example, the carbide is cooled by the cooling devices 16a and 16c and is supplied to the hoppers 22a and 22b. The introduced carbide may be replaced and circulated in the hoppers 22a and 22b using a circulation path (not shown). Moreover, it is good also as a structure which replaces with the circulation path 35 which circulates a carbide | carbonized_material in the tank which stores the carbide | carbonized_material, and stirs a carbide | carbonized_material in a tank by installing a stirring blade etc. in the hopper 22b, for example. That is, if the carbide can be sufficiently stirred in the hopper 22b, a stirring device (for example, a stirring blade) other than the circulation path 35 can be used.

  Furthermore, after the circulation process, a curing process is performed in which the humidified carbide is stored in the hopper 22b for a certain time (for example, 8 hours) longer than the cooling time (for example, 2 to 4 hours) in the cooling process. Just before shipping, a recirculation step of circulating in the tank of the hopper 22b using the circulation path 35 may be performed. Then, the temperature of the humidified carbide stored in the hopper 22b after cooling can be further lowered by the curing process, and the state can be further stabilized. In addition, the recirculation process makes it possible to make the temperature state of the humidified carbide tank in the tank just before shipment more uniform, enabling product shipment in a more stable state, and more reliably increasing the temperature at the shipping destination. Can be prevented.

  As shown in the “no cooling” graph in FIG. 1, when the organic waste carbide is humidified to about 5 to 15% by weight, the temperature continues to rise for about 2 hours after humidification. Become. Therefore, if the cooling process by the cooling devices 16a to 16c is performed within 2 to 4 hours after the humidification process by the humidifier 14 is completed, heat can be removed more effectively, and more preferably, immediately after the humidification. When the cooling is started and the cooling is continued for about 2 to 4 hours, it is possible to prevent excessive cooling while effectively suppressing the heat generation immediately after humidification, so that the production efficiency can be further improved. That is, since the humidification heat generation of the carbide has a reaction time of about 2 hours, even if the cooling is too early, it generates heat when stored in the subsequent hoppers 22a to 22c, and even if it is too late, before cooling in the cooling devices 16a and 16c. Since the heat is generated, the cooling step is performed within two hours after the humidification step, so that it is possible to avoid the temperature of the carbide after the humidification from rising again and causing thermal runaway.

  The cooling process is performed by an indirect cooling method in which a coolant is circulated around the cylindrical body 40, which is a cooling container filled with humidified carbide, so that the humidification is performed compared to the direct cooling method in which water or the like is sprayed directly on the carbide. It is possible to prevent the moisture content and properties of the carbide from being affected.

  As described above, after the cooling process by the cooling devices 16a and 16c, the humidified carbide introduced into the hopper 22b through the second transport line 32 is longer than the cooling time (for example, 2 hours) of the cooling process in the hopper 22b. Storage and curing for a certain period of time (for example, 8 hours) are preferable because the temperature of the humidified carbide can be lowered and stabilized, but the curing process is not necessarily essential, and the humidified carbide after cooling should be shipped immediately. Of course it is possible. In other words, in the case of the conventional method in which the cooling process is not performed after the final humidification process, the time for the storage process (curing process) becomes long, so that rapid shipping after humidification is difficult. .

  According to the carbide manufacturing system 10 according to the present embodiment, a carbonization furnace 12 that carbonizes organic waste to generate carbide, a humidifier 14 that humidifies the carbide, and a product P using the humidifier 14. And cooling devices 16a to 16c for cooling the carbide that has been finally humidified before being shipped. As a result, the carbide before shipping as a product can be cooled immediately after humidification to suppress the temperature rise, so the storage time until the humidified carbide is shipped as a product can be shortened, the storage space is reduced, and the yield is improved. Can be made.

  In the manufacturing system 10, the cooling devices 16 a to 16 c and the hoppers 22 a to 22 c are connected to each other to provide three cooling storage facilities for cooling and storage, and these three cooling storage facilities are carried out from the humidifier 14. Is connected in order from the humidifier 14 side in the direction of carbide transfer to the first input conveyor 26 constituting the first transfer line 20 of the carbide to be supplied from the cooling storage facility (the cooling device 16c and the hopper 22c) on the most downstream side. Is also provided with a second transport line 32 capable of supplying the humidified carbide after cooling to the cooling storage facility (cooling device 16b and hopper 22b) connected to the upstream side.

  In this way, the hopper 22b that performs the final curing process is installed at a position that is not the most downstream side in the direction from the upstream side to the downstream side of the first input conveyor 26, and the carbide is introduced downstream of the hopper 22b. By installing the cooling device 16c and the hopper 22c for cooling or the like, the carbides that have passed through the first charging conveyor 26 without passing through the charging port 26a to the cooling device 16a are allowed to pass through the cooling device 16b and be downstream. It can be charged into the cooling device 16c. As a result, it is possible to prevent the humidified carbide before cooling from being accidentally put into the shipping hopper 22b that performs the final curing process, thereby further stabilizing the product temperature and improving the product quality. be able to.

  Note that the present invention is not limited to the above-described embodiments and examples, and it is needless to say that the present invention can be freely changed without departing from the gist of the present invention.

  For example, the configuration of the cooling devices 16a to 16c may be other than the configuration shown in FIG. 3, and may be any configuration that can cool the carbide after humidification. However, in the cooling process performed after the final humidification process, it is necessary to avoid affecting the moisture content and properties of the moisturized carbide before shipment with adjusted moisture content. It is preferable to use a cooling system configuration. Of course, the number of installed cooling devices may be other than three, for example, one, two, or four or more.

  In the carbide production system 10 shown in FIG. 2, a system in which the humidifier 14 is introduced immediately after carbonization of organic waste in the carbonization furnace 12 is illustrated. However, the carbide is transferred from the carbonization furnace of another system. Of course, it is okay.

DESCRIPTION OF SYMBOLS 10 Carbide manufacturing system 12 Carbonization furnace 14 Humidifier 16a-16c Cooling device 22a-22c Hopper 20 1st conveyance line 32 2nd conveyance line 35 Circulation path 40 Cylindrical body 42 Cooling tank 44 Cooling part 46 Input part 48 Discharge part 50 Top Plate 52 Bottom plate 54 Leveling device 56 Open / close damper device 82 Open / close lid 88 Additional device

Claims (17)

A method for producing a carbide for humidifying a carbide obtained by carbonizing an organic waste and shipping the humidified carbide as a product,
After the final humidification process before shipment of the carbide is performed, a cooling process for cooling the carbide humidified by the humidification process is performed. In the manufacturing method of the carbide according to claim 1,
In the cooling step, the carbide is cooled while supplying air into the cooling container containing the carbide and performing air purge. In the manufacturing method of the carbide according to claim 1 or 2,
A method for producing carbide comprising performing a step of stirring the carbide after the cooling step. In the manufacturing method of the carbide according to claim 3,
In the step of stirring, the carbide is stirred while supplying air into a tank of a storage facility containing the carbide and performing air purge. In the manufacturing method of the carbide according to claim 3 or 4,
After the step of stirring, in the storage facility containing the carbide, a storage step for storing for a certain time longer than the cooling time in the cooling step is performed, and then immediately before shipping the carbide as a product, the storage facility A method for producing carbide comprising performing a step of stirring the carbide again inside. In the manufacturing method of the carbide according to any one of claims 3 to 5,
The step of stirring is a method for producing carbide characterized by being a circulation step in which the carbide is replaced and circulated in a vertical direction in a tank storing carbide. In the manufacturing method of the carbide according to any one of claims 1 to 6,
The said cooling process is performed within 2 to 4 hours after completion | finish of the said humidification process, The manufacturing method of the carbide | carbonized_material characterized by the above-mentioned. In the manufacturing method of the carbide according to any one of claims 1 to 7,
The said cooling process is performed by the indirect cooling system which distribute | circulates a cooling fluid around the cooling container filled with the said carbide | carbonized_material, The manufacturing method of the carbide | carbonized_material characterized by the above-mentioned. A carbonization furnace for carbonizing organic waste to produce carbide,
A humidifier for humidifying the carbide;
A cooling device that cools the carbide that has been finally humidified before being shipped as a product in the humidifier;
A carbide production system comprising: The carbide production system according to claim 9, wherein
The said cooling device is equipped with the air supply port which supplies air into the cooling container which accommodates and cools the said carbide | carbonized_material, and performs an air purge, The carbide manufacturing system characterized by the above-mentioned. In the carbide production system according to claim 9 or 10,
A hopper for storing carbide cooled by the cooling device;
The carbide manufacturing system, wherein the hopper is provided with a stirring device that stirs the carbide stored inside. In the carbide production system according to claim 11,
The carbide agitation system according to claim 1, wherein the agitation device is a circulation device having a circulation path in which the carbide is exchanged in the vertical direction in the hopper. The carbide production system according to any one of claims 9 to 12,
The cooling container is a cylindrical body in which an inlet for filling the carbide is provided in the upper part, and an openable / closable outlet for discharging the carbide after cooling is provided in the lower part.
The cooling device includes a cooling tank in which the cylindrical body is housed and arranged, and a coolant can be circulated around the cylindrical body. In the carbide production system according to claim 13,
A plurality of the cylindrical bodies are provided in the cooling tank. The carbide production system according to claim 14,
The entrance of each cylinder opens at the top surface of the top plate that closes the top of the cooling tank,
A carbide production system comprising a leveling device for leveling an uncooled carbide charged on an upper surface of the top plate and filling it into an inlet of each cylinder. In the carbide production system according to any one of claims 13 to 15,
A carbide production system comprising a discharge promoting device that applies an impact to a lower portion of the cylindrical body and promotes the discharge of carbide from the outlet. The carbide production system according to claim 9, wherein
A hopper for storing carbide discharged from the cooling device is connected to the cooling device,
The carbide production system includes a plurality of cooling storage facilities connecting the cooling device and the hopper, and the plurality of cooling storage facilities are provided with respect to a carbide conveying line carried out of the humidifier. Are connected in order from the humidifier side in the transport direction of
A carbide manufacturing system comprising a second transport line capable of supplying carbide discharged from the cooling storage facility to a cooling storage facility connected upstream in the transport direction of the carbide in the transport line.

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