JP2005103437A - Processing method of organic material containing water and its facility - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the granule enlargement phenomenon of raw material in a drying process and a carbonization process. <P>SOLUTION: In a processing method of organic material containing water for heating the raw material comprising the organic material containing water by indirect-heating rotary kilns (a drying kiln 11 and a carbonization kiln 13) to obtain dried material or carbonized material, when the raw material is supplied to a drying process in the rotary kilns, a part of the dried material (or the carbonized material) generated in the rotary kiln is added to and mixed with the raw material by a dried material supply means (or a carbonized material supply means 16). It is preferable that heating treatment for obtaining the dried material and heating material for obtaining the carbonized material are performed in a different rotary kiln. It is preferable that the heating treatment for obtaining the dried material is performed using a plurality of the rotary kilns. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  In the present invention, raw materials such as various sludges containing organic hydrated substances, for example, organic hydrated substances derived from microorganisms, animals and plants, etc. are processed to obtain dried products or carbides. It relates to processing methods and facilities.

  A technique has been proposed in which an organic hydrated material, such as sewage sludge, is dried and converted into a carbide by thermal decomposition and reused. In this case, as the thermal decomposition treatment means, a device for carrying and stirring inside the fixed thermal decomposition vessel, a rotary kiln device for rotating the thermal decomposition vessel, or the like is used.

  Since the sewage sludge has a high moisture content (for example, a moisture content of 85%), a rotary kiln system that can secure a large heat transfer area is advantageous, and it is also convenient for treating a large amount of sewage sludge.

  For example, a technique disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 49-52875) is known as a device that includes a plurality of rotary kilns and thermally decomposes an object to be treated such as sludge.

  However, in the case of an object to be treated having a high water content such as sewage sludge, drying is necessary as a pretreatment. FIG. 3 is a schematic view showing an example of a heat treatment facility including a drying furnace 11 and a carbonization furnace 13 adopting a rotary kiln system.

  In the drying furnace 11, an external heating means (heating jacket 111) that heats the rotary furnace 110 from the outside by circulating hot air gas around the rotary furnace 110 is attached to the rotary furnace 110 into which the raw material is introduced. Hot air gas is introduced from a hot air furnace (not shown). The rotary furnace 110 has a cylindrical shape, is supported by a plurality of support rollers 112, and is rotated by a rotating means 113 having a rotation drive source 114. In addition, a plurality of feed blades 115 for stirring and conveying the introduced raw material may be provided inside the rotary furnace 110. Further, a raw material supply means 10 such as a hopper facility is connected to one end side of the rotary furnace 110 via a seal member 100 so that the raw material supply means 10 such as a hopper facility can be rotated. Further, on the other end side, a duct 116 for transferring the raw material in the rotary furnace 110 to the next process (carbonization furnace 13) is connected to the rotary furnace 110 via a seal member 117 so as to be rotatable and airtight.

  The carbonization furnace 13 has the same configuration as that of the drying furnace 11 and includes a heating jacket 131 attached to a rotary furnace 130 that introduces a dried raw material, and that is stirred and conveyed. At one end of the rotary furnace 130, a duct 136 for introducing the dried product discharged from the drying furnace 11 is connected to the rotary furnace 130 through a seal member 137 in a freely and airtight manner. At the other end, a duct 138 for recovering the carbide generated in the carbonization furnace 13 is connected to the rotary furnace 130 through a seal member 139 so as to be rotatable and airtight. The duct 136 includes a conveying means 12 for conveying the dried product to the carbonization furnace 13. The conveying means 12 includes a screw conveyor 120 driven by a driving source M, and a hopper unit 121 for supplying dried material to the screw conveyor 120. The hopper 120 is connected to the duct 116 via the flexible joint 122, so that the drying furnace 11 and the carbonization furnace 13 are connected in an airtight manner.

  In such a heat treatment facility, when the raw material drying process is performed in the rotary kiln furnace (drying furnace 11) like the illustrated lump a of the dry matter, the raw material rotates in the rotary furnace 110. Originally fine particles may be enlarged due to rotation and drying.

  It is necessary to convey this to the rotary kiln of another structure for the reduction process (carbide etc.) by dry distillation in the next process.

  However, when the object to be processed is spheroidized, there is a possibility of clogging in a passage (duct) conveyed to the kiln (carbonization furnace 13) of the next process. In addition, the object to be processed which has become spheroidized and enlarged does not transmit heat to the inside, and cannot be sufficiently carbonized by drying and pyrolysis.

  By the way, performing various treatments using a rotary kiln is generally carried out, and various proposals have been made as removal means in the case where a denatured material to be treated adheres to the inner wall of the kiln. For example, in a rotary kiln furnace described in Patent Document 2 (Japanese Patent No. 2526350), deposits are removed by disposing various members that move with rotation in the rotary kiln. Further, in the rotary kiln furnace described in Patent Document 3 (Japanese Patent Application Laid-Open No. 2000-105079), a floating rod-like member is disposed in the rotary kiln to remove the adhering to the inner wall of the kiln. In a rotary kiln furnace described in Patent Document 4 (Japanese Patent Laid-Open No. 10-318678), a metal ball is housed in the furnace and collides with a clinker attached to the inner wall of the kiln to remove the clinker. According to these means, the deposits can be removed or prevented from sticking, and the granulation of the workpiece can be prevented to some extent as a side effect.

  However, storing and operating the movable member in the rotary kiln causes a decrease in the durability of the rotary kiln. When the rotation is stopped, if the processed material and various decomposed products that have decomposed and deposited remain in the interior, these substances do not stop solidifying, but the various movable members placed together are fixed. There is a possibility that they will be released, and once they are fixed, it is difficult to release them.

On the other hand, Patent Document 5 (Japanese Patent Application Laid-Open No. Hei 11) discloses a technique for mixing and processing a part of a dried product and carbide obtained for the purpose of effectively performing combustion and drying steps when the moisture content of the raw material is high. -33740) and Patent Document 6 (Japanese Patent Laid-Open No. 2001-246400). However, although these sludge treatment facilities pay attention to the problem by the moisture content of the raw material (sludge), they do not pay attention to the enlargement of the raw material.
JP 49-52875 A Japanese Patent No. 2526350 JP 2000-105079 A JP-A-10-318678 Japanese Patent Laid-Open No. 11-337040 JP 2001-246400 A

  In order to obtain a carbide by pyrolyzing a raw material containing organic matter derived from microorganisms having a high water content such as sewage sludge, it is necessary to dry the raw material as a pretreatment. When this drying is performed with a rotary kiln, the object to be processed rotates in the kiln, so that the original fine particles may be granulated by rotation and drying, resulting in granular enlargement.

  This phenomenon seems to be related to factors such as the properties of raw materials (sludge generation conditions, etc.) and heating conditions (temperature, transport time, rotation speed, stirring speed, etc.).

  It is necessary to convey this to the rotary kiln of the next process for volume reduction (carbide etc.) processing to dry distillation in the next process.

  And when a to-be-processed object becomes granular enlargement, there exists a possibility that it may be clogged in the channel | path (duct) of the process conveyed to the rotation kiln of the next process. Furthermore, heat is not transferred to the inside of the workpiece that has become larger due to the granular enlargement, and drying and thermal decomposition (carbonization) cannot be performed sufficiently.

  The present invention has been made in view of such circumstances, and its purpose is to prevent a granular enlargement phenomenon of the raw material in the drying step and the carbonization step in heat treatment for drying or carbonizing the raw material derived from microorganisms, animals and plants, etc. To provide organic hydrated processing methods and facilities.

  Therefore, the processing method of organic hydrated product and its facility according to the present invention prevent the particulate enlargement phenomenon of the raw material in the drying process by mixing a part of the dry matter or carbide generated in the processing facility with the raw material. doing.

  That is, the processing method of the organic hydrated product of the present invention is a method for processing an organic hydrated product that obtains a dried product or a carbide by heating the raw material composed of the organic hydrated product in an indirect heating type rotary kiln furnace When the raw material is subjected to the drying process in the rotary kiln furnace, a part of the dried product or carbide generated in the rotary kiln furnace is added and mixed with the raw material.

  In addition, the heat treatment facility of the present invention recovers a rotary kiln furnace that heats a raw material made of an organic water-containing material to produce a dried product or carbide, and a part of the dried product or carbide generated in the rotary kiln furnace. And a means for supplying the raw material to the rotary kiln furnace.

  In the organic water-containing material processing method and heat treatment facility, the heat treatment for obtaining the dried product and the heat treatment for obtaining the carbide may be performed in different rotary kiln furnaces. In addition, the heat treatment for obtaining a dried product is preferably performed in a plurality of rotary kiln furnaces. Furthermore, the addition rate of the dried product and the carbide may be 3 to 10% by weight based on the raw material.

  When the raw material is subjected to a heat treatment as in the above invention, a dry substance or a carbide obtained by heat-treating the raw material is added to the raw material, so that a dry substance having a property different from that of the surrounding material between the raw material particles Since the product or carbide is present, fusion between the organic materials constituting the raw material is prevented. Furthermore, since the added dry matter or carbide has higher thermal conductivity than the raw material, the heating efficiency of the raw material is increased by contact between the dry matter particles or carbide particles and the raw material particles.

  According to the organic water-containing material processing method and facility of the present invention, a dry material or carbide, which is a material having a property different from that of the surrounding material, is obtained between the raw material particles by adding the dry material or carbide to the raw material. Intervening prevents fusion between organic substances constituting the raw material, and prevents the phenomenon of granular enlargement of the raw material in the drying and carbonization processes. Furthermore, since the added dry matter or carbide has higher thermal conductivity than the raw material, the heating efficiency of the raw material is improved by the contact between the carbide particles and the raw material particles. Therefore, the phenomenon of granular enlargement of the raw material is prevented in the drying and carbonization process, and heat can be transferred to the vicinity of the center of the raw material in the drying process and pyrolysis process of the raw material, so that stable drying and carbonization of the raw material can be performed. Yes.

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

(Embodiment 1)
FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention.

  The illustrated heat treatment facility is an apparatus for obtaining a carbide by drying and further pyrolyzing raw materials made of organic hydrate (eg, various sludges containing organic hydrates derived from microorganisms, animals and plants) by indirect heating. Thus, a drying furnace 11, a carbonization furnace 13, and a hot stove 14 are provided.

  The drying furnace 11 is a device that indirectly heats a raw material under a certain residence time and performs a drying process, and employs a rotary kiln system. That is, in the drying furnace 11, an external heating means (heating jacket 111) for heating the rotary furnace 110 from the outside by circulating hot air gas around the rotary furnace 110 is attached to the rotary furnace 110 into which the raw material is introduced. . The hot air gas is introduced from a hot air furnace 14 described later.

  The rotary furnace 110 has a cylindrical shape, is supported by a plurality of support rollers 112, and is rotated by a rotating means 113 having a rotation drive source 114. At this time, a plurality of feed blades (not shown) for stirring and conveying the introduced raw material may be provided inside the rotary furnace 110. Further, in this embodiment, a raw material supply means 10 such as a hopper facility is connected to one end side of the rotary furnace 110 via a seal member 100 so that the raw material supply means 10 such as a hopper facility is rotatably and airtightly connected. Yes. Further, on the other end side, a duct 116 for transferring the raw material in the rotary furnace 110 to the next process (carbonization furnace 13) is connected to the rotary furnace 110 via a seal member 117 so as to be rotatable and airtight.

  The raw material supply means 10 employs a screw conveyor system having a screw driven by a drive source M, and in addition to the hopper portion 101 for supplying the raw material to the screw conveyor, the carbide obtained in the carbonization furnace 13 described later is used as the raw material. The hopper part 102 for mixing is provided.

  The carbonization furnace 13 has the same configuration as that of the drying furnace 11 and includes a heating jacket 131 attached to a rotary furnace 130 that introduces a dried raw material, and that is stirred and conveyed. The rotary furnace 130 has a cylindrical shape, is supported by a plurality of support rollers 132, and is rotated by a rotating means 133 including a rotation drive source 134. At one end of the rotary furnace 130, a duct 136 for introducing the dried product discharged from the drying furnace 11 is connected to the rotary furnace 130 through a seal member 137 in a freely and airtight manner. Further, a duct 138 for discharging carbide generated in the carbonization furnace 13 is connected to the other end of the rotary furnace 130 through a seal member 139 so that the rotary furnace 130 is rotatable and airtight.

  The duct 136 includes a conveying means 12 for conveying the dried product to the carbonization furnace 13. The conveying means 12 includes a screw conveyor 120 driven by a driving source M, and a hopper unit 121 for supplying dried material to the screw conveyor 120. The hopper 120 is connected to the duct 116 via the flexible joint 122, so that the drying furnace 11 and the carbonization furnace 13 are connected in an airtight manner. The duct 116 is connected to a pipe for transferring water vapor generated in the drying furnace 11 to the gas combustion furnace 18. The duct 136 is connected to a pipe for transferring the pyrolysis gas generated in the carbonization furnace 13 to the gas combustion furnace 18.

  The recovered carbide is used as an additive or various materials (materials for adsorbent and soil conditioner) for preventing the granular enlargement phenomenon of the raw material in the drying process. When carbide is used as the additive, it is conveyed by the carbide supply means 16 to the hopper portion 102 of the raw material supply means 10. On the other hand, when carbide is used for various materials, it is conveyed out of the system by the carbide recovery means 17. For this purpose, a valve means 15 capable of switching the supply destination of carbide to the carbide supply means 16 side or the carbide recovery means 17 side is installed in a path connecting the duct 138, the carbide supply means 16 and the carbide recovery means 17. The The carbide supply means 16 and the carbide recovery means 17 may be anything that can carry carbide, and for example, a pipe conveyor is adopted.

  The hot air furnace 14 is a device that supplies hot air gas, and includes a combustion burner for generating hot air gas. The hot air gas is supplied to the heating jacket 131 of the carbonization furnace 13 by a blower (not shown), and after heating the rotary furnace 130, is supplied into the heating jacket 111 of the drying furnace 11 to heat the rotary furnace 110. At this time, temperature adjusting air is appropriately injected into the hot air gas, and the gas temperature is adjusted. The heating medium (hot air gas) discharged from the heating jacket 111 is exhausted. A part of the heating medium is used as an ejector driving gas in the gas combustion furnace 18 or reused as a hot air gas supplied to the heating jackets 111 and 131 by a blower (not shown).

  The gas combustion furnace 18 uses steam and pyrolysis gas introduced from the drying furnace 11 and the carbonization furnace 13 under a certain atmosphere and residence time (for example, an atmosphere of 800 ° C. or higher, more specifically, for example, about 850). Combustion and detoxification treatment (residence time of 2 seconds or more) At this time, air is appropriately introduced into the gas to be treated from outside the system to assist combustion. The gas combustion furnace 18 includes a gas combustion chamber to which a gas to be treated is supplied, and is provided with a combustion burner. Combustion by the combustion burner is appropriately controlled by adjusting the amount of fuel supplied. The gas burned in the gas combustion furnace 18 is supplied to the heat exchanger 19.

  The heat exchanger 19 cools the gas to about 200 to 150 ° C. by a gas-gas heat exchange system using air as a cooling medium. At this time, fresh air not containing at least a sulfur component is appropriately supplied to the gas to be cooled (combusted gas), and the gas temperature is adjusted appropriately.

  An operation example of the present embodiment will be outlined with reference to FIG.

  First, the raw material is supplied to the drying furnace 11 by the raw material supply means 10. At this time, the carbide conveyed from the carbide supply means 16 is introduced into the conveyor chamber of the raw material supply means 11 via the hopper 102. For example, 3 to 10% by weight of the carbide is added to the raw material. The raw material is conveyed into the drying furnace 11 while being mixed and stirred by the conveyor together with the introduced carbide.

  In the drying furnace 11, the raw material is indirectly heated and dried under an atmosphere of about 350 to 450 ° C. and a fixed residence time (for example, about 30 minutes). At this time, carbides are added to the raw material, and carbides having properties different from those of the surrounding materials are interposed between the raw material particles, so that fusion of organic substances constituting the raw material is prevented, and the raw material is not dried during drying. Granular enlargement phenomenon is suppressed. Furthermore, since the added carbide has higher thermal conductivity than the raw material, heat is transferred to the vicinity of the center of the raw material by contact between the carbide particles and the raw material particles. Moreover, the water | moisture content contained in a raw material is discharge | released as water vapor | steam. The water vapor is supplied to the gas combustion furnace 18 through a pipe connected to the duct 116. The dried raw material is conveyed by the conveying means 12 and supplied to the carbonization furnace 13.

  In the carbonization furnace 13, the dried raw material is indirectly heated, for example, at about 450 to 600 ° C. to reduce the volume to carbide. On the other hand, the decomposition deposition component of the raw material is subjected to a combustion treatment in the gas combustion furnace 18 and burned under a constant atmosphere and a residence time (for example, an atmosphere at about 850 ° C. for a residence time of 2 seconds or more). It is processed. At this time, steam and pyrolysis gas are appropriately introduced into the gas combustion furnace 18 from the drying furnace 11 and the carbonization furnace 13. The gas burned in the gas combustion furnace 18 is transferred out of the system through the heat exchanger 19 and the bag filter 20 by the blower 21. In addition, the air heated by the heat exchanger 19 is provided for the production | generation of the hot air gas in the hot stove 14 via A line.

  The carbide generated in the carbonization furnace 13 is recovered by the carbide recovery means 17 and used for the subsequent classification, bagging process, and the like. At this time, the valve means 15 switches the carbide supply destination to the carbide supply means 16 side at an appropriate time, and uses the carbide as an additive for preventing the granular enlargement phenomenon of the raw material in the drying furnace 11.

(Embodiment 2)
FIG. 2 is a schematic configuration diagram showing another embodiment of the present invention. In addition, in the component of this embodiment, the same code | symbol as this component was attached | subjected to the same component disclosed in FIG. 1, and the description was abbreviate | omitted suitably.

  In this embodiment, the raw material is dried by a plurality of heat treatment apparatuses. Here, two drying furnaces are installed, but the number is not limited to this. The illustrated drying furnace 30 employs a rotary kiln system similarly to the drying furnace 11. That is, the heating jacket 301 is attached to the rotary furnace 300 which introduces the dried raw material and stirs and conveys it. The rotary furnace 300 has a cylindrical shape, is supported by a plurality of support rollers 302, and is rotated by a rotating means 303 having a rotation drive source 304. At one end of the rotary furnace 300, a duct 305 for introducing the dried product discharged from the drying furnace 11 is connected to the rotary furnace 300 through a seal member 306 in a freely and airtight manner. Further, the rotary furnace 300 is rotatably and airtightly connected to the other end of the rotary furnace 300 through a seal member 308 for discharging a carbide 307 generated in the drying furnace 30.

  The duct 305 includes transport means 12 for transporting the dried product to the carbonization furnace 13. The conveying means 12 includes a screw conveyor 120 driven by a driving source M, and a hopper unit 121 for supplying dried material to the screw conveyor 120. The hopper 120 is connected to the duct 116 via the flexible joint 122, so that the drying furnace 11 and the drying furnace 30 are connected in an airtight manner. The duct 305 is connected to piping for transferring water vapor and pyrolysis gas components generated in the drying furnace 30 to the gas combustion furnace 18.

  The recovered dried product is used for the use of additives to prevent the granular enlargement phenomenon of the raw material in the drying process, or is used for various materials, or further processed into a carbide. It is used for the thermal decomposition process. When the dried product is used as the additive, the dried product is conveyed to the hopper 102 of the raw material supply unit 10 by the dried product supply unit 31. On the other hand, when the dried product is used for various materials, the dried product is transferred out of the system (next process, for example, carbonization treatment) by the dried product recovery means 32. Therefore, a valve that can switch the supply destination of the dried product to the dried product supply unit 31 side or the dried product collection unit 32 side in a path connecting the duct 307, the dried product supply unit 31, and the dried product collection unit 32. Means 15 are installed. The dry matter supply means 31 and the dry matter recovery means 32 may be anything that can transport the dry matter, and for example, a pipe conveyor is employed.

  An operation example of the present embodiment will be outlined with reference to FIG.

  First, the raw material is supplied to the drying furnace 11 by the raw material supply means 10. At this time, the dried product conveyed from the dried product supply unit 31 is introduced into the conveyor chamber of the raw material supply unit 11 through the hopper 102. For example, 3 to 10% by weight of the dried product is added to the raw material. The raw material is conveyed into the drying furnace 11 while being mixed and stirred by the conveyor together with the introduced dried product.

  In the drying furnace 11, the raw material is indirectly heated and dried under an atmosphere of about 300 to 400 ° C. and a fixed residence time (for example, about 30 minutes). At this time, a dried product is added to the raw material, and a dried product having a property different from that of the surrounding material is interposed between the raw material particles, so that fusion of organic substances constituting the raw material is prevented, and drying and The granular enlargement phenomenon of the raw material is suppressed in the carbonization process. Furthermore, since the added dry matter has higher thermal conductivity than the raw material, heat is transferred to the vicinity of the center of the raw material by contact between the dry matter particles and the raw material particles. Moreover, the water | moisture content contained in a raw material is discharge | released as water vapor | steam. The water vapor is supplied to the gas combustion furnace 18 through a pipe connected to the duct 116. The dried raw material is conveyed by the conveying means 12 and supplied to the drying furnace 30.

  In the drying furnace 30, the dried raw material is indirectly heated at, for example, about 400 to 500 ° C. and further dried. On the other hand, the decomposition deposition component of the raw material is subjected to a combustion treatment in the gas combustion furnace 18 and burned under a constant atmosphere and a residence time (for example, an atmosphere at about 850 ° C. for a residence time of 2 seconds or more). It is processed. At this time, steam is appropriately introduced into the gas combustion furnace 18 from the drying furnaces 11 and 30. The gas burned in the gas combustion furnace 18 is transferred out of the system through the heat exchanger 19 and the bag filter 20 by the blower 21.

  The dried product produced in the drying furnace 30 is collected by the dried product collecting means 31 and used for the next step, for example, a pyrolysis step for obtaining carbide. At this time, the valve unit 15 switches the supply destination of the dried product to the dried product supply unit 31 side at an appropriate time, and uses the dried product as an additive for preventing the granular enlargement phenomenon of the raw material in the drying furnace 11. Provide.

The schematic block diagram which showed the embodiment of this invention. The schematic block diagram which showed the embodiment of this invention. The schematic block diagram of the conventional processing apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Raw material supply means 101, 102 ... Hopper part 11, 30 ... Drying furnace 12 ... Conveyance means 13 ... Carbonization furnace 14 ... Hot stove 15 ... Valve means 16 ... Carbide supply means 17 ... Carbide recovery means 31 ... Dry matter supply means 32 ... Dry matter recovery means 18 ... Gas combustion furnace, 19 ... Heat exchanger, 20 ... Bag filter, 21 ... Blower

Claims (4)

In the processing method of the organic hydrated product, in which the raw material composed of the organic hydrated product is heat-treated in a rotary kiln furnace of an indirect heating method to obtain a dried product or a carbide, when the raw material is subjected to the drying step in the rotary kiln furnace A method for processing an organic water-containing material, wherein a part of a dried product or carbide generated in the rotary kiln furnace is added to and mixed with a raw material. The method for processing an organic water-containing material according to claim 1, wherein the heat treatment for obtaining a dried product and the heat treatment for obtaining a carbide are performed in different rotary kiln furnaces. The method for processing an organic hydrated product according to claim 1 or 2, wherein the heat treatment for obtaining a dried product is performed in a plurality of rotary kiln furnaces. A rotary kiln furnace that heats a raw material composed of organic water-containing material to produce a dried product or a carbide, and a portion of the dried product or carbide generated in the rotary kiln furnace is recovered, and is supplied to the rotary kiln furnace. And a means for supplying the raw material to be processed.

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