JP3840584B2 - Sludge carbonization equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a sludge carbonization apparatus, and more specifically, for example, sludge carbonization treatment in which sludge generated in a sewage treatment process in a sewage treatment facility is dried and carbonized to be used as a soil conditioner or the like. It relates to the device.
[0002]
[Prior art]
Domestic sewage discharged from ordinary households, offices, department stores, restaurants, etc. is treated with sewage treatment facilities, and sludge containing a large amount of organic matter is generated in the process. After drying this sludge, it heats and carbonizes further, and using the obtained carbide | carbonized_material as a soil improvement agent, a snow melting agent, etc. is performed. In an apparatus for carbonizing sludge, sludge (so-called `` dehydrated cake '') is supplied to a drying furnace and dried to a required moisture content, and then this dried sludge is supplied to the carbonization furnace and heat-treated, thereby causing voids and Configured to produce pore rich carbides.
[0003]
[Problems to be solved by the invention]
The carbonization apparatus includes a hot air generating furnace that heats air to a required temperature, and supplies a high-temperature drying gas generated in the hot air generating furnace to the drying furnace, so that the moisture content supplied to the drying furnace is increased. It is configured to dry high sludge. In other words, a hot air generating furnace must be provided in addition to the drying furnace, which increases the equipment cost and increases the size of the entire apparatus, and requires a large installation space. In addition, it is pointed out that the cost of the fuel used in the hot air generating furnace increases and the overall running cost increases.
[0004]
Here, since the treated gas discharged from the drying furnace is mixed with odor generated from sludge, if this is discharged directly to the outside, the surrounding environment is contaminated and becomes a problem. For this reason, a deodorizing furnace is provided on the exhaust side of the drying furnace, and the treated gas discharged from the drying furnace is deodorized by heating in the deodorizing furnace and then discharged to the outside. In this case, since a deodorizing furnace is required as ancillary equipment, the equipment cost is further increased, and the entire apparatus is increased in size to cause a difficulty that requires a large installation space. In addition, it is pointed out that the cost of fuel used in the deodorization furnace increases and the overall running cost increases.
[0005]
OBJECT OF THE INVENTION
The present invention has been proposed in view of the above-mentioned drawbacks inherent in the sludge carbonization apparatus according to the prior art, and it has been proposed to suitably solve this problem. It aims at providing the carbonization-treatment apparatus of the sludge which can reduce cost.
[0006]
[Means for Solving the Problems]
To overcome the above problems, to preferably achieve the purpose of Tokoro phase carbonization apparatus sludge according to the present invention,
A drying furnace for performing drying of sludge, the is composed of a carbonization furnace to carbonize the supplied dried sludge from the drying oven, the exhaust port of the carbonization furnace inlet of the drying oven communicatively connected, generated by carbon reduction furnace In the carbonization apparatus in which the high-temperature gas supplied to the drying furnace is allowed to dry sludge,
The exhaust port of the drying furnace is connected in communication with the intake port of the carbonization furnace, and deodorized by heating the treated gas after drying the sludge in the drying furnace in the carbonization furnace. Sludge carbonization equipment.
In order to overcome the above-mentioned problems and achieve the desired purpose suitably, the sludge carbonization apparatus according to another invention of the present application,
In a carbonization treatment apparatus comprising a drying furnace for drying sludge and a carbonization furnace for carbonizing the dried sludge supplied from the drying furnace,
A cylinder body inserted into the carbonization furnace and supplied with dried sludge dried in the drying furnace;
A first combustion chamber defined to communicate with the outside of the cylindrical body, and combusting dry distillation gas generated inside the cylindrical body;
The carbonization furnace is configured to communicate with the first combustion chamber, and includes a second combustion chamber that communicates with the intake port of the drying furnace through the exhaust port.
The configuration is such that high temperature gas generated by burning unburned gas that could not be burned in the first combustion chamber in the second combustion chamber is supplied to the drying furnace to dry the sludge. Features.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Next, the sludge carbonization apparatus according to the present invention will be described in detail with reference to the accompanying drawings by giving a preferred embodiment. FIG. 1 shows a schematic configuration of a carbonization processing apparatus according to an embodiment, and a receiving hopper 10 in which sludge (dehydrated cake having a water content of about 80%) transported from a sewage treatment facility by a truck or the like is stored. Further, a fixed amount supply device 11 such as a MONO pump (registered trademark) is connected. The fixed amount supply device 11 is connected to a rotary kiln type drying furnace 12 and is configured to continuously supply a predetermined amount of sludge from the fixed amount supply device 11 to the drying furnace 12. As shown in FIGS. 2 and 3, the drying furnace 12 includes a charging hopper 15 having a screw conveyor 14 built in an axial end of a cylindrical rotating cylinder 13 that is rotated in a predetermined direction by a driving means (not shown). The sludge from the quantitative supply device 11 is supplied to the charging hopper 15 and then supplied to the inside of the rotary cylinder 13 via the screw conveyor 14. A plurality of lifting rods 16 are disposed on the inner wall surface of the rotating cylinder 13 so as to be spaced apart from each other in the circumferential direction. The sludge supplied to the rotating cylinder 13 is moved to the bottom side by the lifting rod 16 as the rotating cylinder 13 rotates. Then, it is moved toward the outlet 13b while repeating the process of falling to the bottom by its own weight after being lifted to the top side. In the process where the sludge falls to the bottom, the sludge is dried by contacting with a high-temperature (for example, about 700 ° C.) drying gas supplied from a carbonization furnace 26 described later.
[0008]
Inside the rotating cylinder 13, a rotating shaft 18 is rotatably disposed at a position deviated from the axial center of the rotating cylinder 13, and the rotating shaft 18 is configured to be rotated in a predetermined direction by a drive motor 19. Is done. As shown in FIG. 2, the rotary shaft 18 is provided with a plurality of crushing and stirring blades 20 that are spaced apart in the axial direction. The sludge that is lifted from the bottom side to the top side by 16 and falls to the bottom by its own weight is finely crushed. In addition, the particle size of the dry sludge obtained with the said drying furnace 12 can be arbitrarily set by changing the shape and arrangement | positioning number of the crushing stirring blade 20, and the rotation speed of the rotating shaft 18. FIG.
[0009]
The other end of the exhaust gas pipe 27 having one end connected to the drying gas exhaust port 33a in the carbonization furnace 26 is connected to the intake port 12a of the drying furnace 12, and a supply blower 50 inserted in the exhaust gas pipe 27 is connected to the intake port 12a. By rotating, the high-temperature drying gas generated in the carbonization furnace 26 is configured to be sent to the drying furnace 12. One end of the first return pipe 22 is connected to the exhaust port 12 b of the drying furnace 12, and the other end of the first return pipe 22 is connected to the intake port 23 a of the dust collector 23. Further, the other end of the second return pipe 24 having one end connected to the exhaust port 23 b of the dust collector 23 is connected to a gas intake port 35 b (described later) in the carbonization furnace 26, and is inserted into the second return pipe 24. By rotating the circulating blower 25, the sludge is dried in the drying furnace 12 and the treated gas from which dust is removed by the dust collector 23 is returned to the carbonization furnace 26.
[0010]
As shown in FIG. 1, a heat exchanger 30 to which a bypass pipe 29 branched from the exhaust gas pipe 27 between the supply blower 50 and the drying furnace 12 is connected is inserted into the second return pipe 24. Yes. Further, an exhaust blower 31 is inserted in the bypass pipe 29 on the outlet side of the heat exchanger 30, and a part of the drying gas flowing through the exhaust gas pipe 27 is introduced into the bypass pipe 29 by rotating the blower 31. It is configured. That is, the treated gas lowered by heat exchange in the drying furnace 12 is exchanged with the drying gas in the heat exchanger 30 to be raised to a required temperature, and then returned to the carbonization furnace 26. It has become. Note that the air volume of the drying gas supplied to the drying furnace 12 controls the rotation of the supply blower 50 and the exhaust blower 31 and is applied to the adjustment valve 47 and the bypass pipe 29 inserted in the second return pipe 24. The optimum state is maintained by adjusting the inserted adjustment valve 48.
[0011]
A transfer device 32 is connected to the outlet 13 b of the drying furnace 12, and dried sludge dried to a required water content (about 40%) in the drying furnace 12 is supplied to the carbonization furnace 26 by the transfer device 32. . As shown in FIG. 4, the carbonization furnace 26 includes two primary furnace bodies 34 and 34 and a secondary furnace body 35 that are in communication with each other inside a furnace body 33. 34 and the secondary furnace body 35 are configured to communicate with each other through a through hole 36. The furnace body 33 is rotatably supported by a cylindrical rotary cylinder (cylinder) 37 penetrating the two primary furnace bodies 34, 34 and is rotated in a predetermined direction by a drive motor 38. At the same time, the dried sludge transferred by the transfer device 32 is supplied through the inlet 37a. The rotary cylinder 37 is provided with a plurality of dry distillation gas supply pipes 39 communicating with the primary combustion chamber 34 a defined in the primary furnace body 34, and the dry distillation gas generated inside the rotary cylinder 37. Is ejected to the primary combustion chamber 34a. Further, a plurality of auxiliary combustion burners 40 are disposed inside the primary furnace body 34, and the rotary cylinder 37 is heated by the burners 40 so that dry distillation gas can be generated (steamed state). After the dry distillation gas is generated, the inside of the rotary cylinder 37 is held in the dry distillation state by burning the dry distillation gas ejected from the rotary cylinder 37 into the primary combustion chamber 34a. The primary furnace body 34 is supplied with pilot burner LPG and auxiliary burner kerosene, and the rotary cylinder 37 is supplied with oxygen (air) sufficient to maintain a dry distillation state. It has become.
[0012]
A secondary combustion chamber 35a is defined inside the secondary furnace body 35, and a secondary combustion burner 41 is disposed, and unburned gas that could not be burned in the primary combustion chamber 34a is passed through. 36 is supplied to the secondary combustion chamber 35a and combusted. The secondary combustion chamber 35a is supplied with oxygen (air) in an amount capable of completely burning the unburned gas. The high-temperature gas (drying gas) generated by the combustion in the secondary combustion chamber 35 a is supplied to the drying furnace 12 through the exhaust gas pipe 27 connected to the exhaust port 33 a provided in the furnace body 33. It is configured as follows. Further, the second return pipe 24 is connected to the intake port 35b of the secondary combustion chamber 35a, and the odor is removed by heating the treated gas discharged from the drying furnace 12 in the secondary combustion chamber 35a ( Deodorized).
[0013]
As shown in FIG. 5, a plurality of lifting rods 42 are arranged on the inner wall surface of the rotary cylinder 37 arranged in the carbonization furnace 26 so as to be separated from each other in the circumferential direction, and the dried sludge supplied to the rotary cylinder 37 is As the rotary cylinder 37 is rotated, it is moved from the bottom side to the top side by the lifting rod 42 and then moved toward the outlet 37b while repeating the process of dropping to the bottom by its own weight. The lifting rod 42 is not an essential requirement and can be omitted.
[0014]
[Effect of the embodiment]
Next, the operation of the sludge carbonization apparatus according to the above-described embodiment will be described. In the initial stage of operation of the carbonization apparatus, the air in the primary combustion chamber 34a and the secondary combustion chamber 35a is heated by the auxiliary heating burner 40 and the secondary combustion burner 41 of the carbonization furnace 26, and a high-temperature drying gas is used. And this gas is supplied to the drying furnace 12 through the exhaust gas pipe 27. Further, the sludge (for example, moisture content of 80%) continuously supplied from the quantitative supply device 11 to the drying furnace 12 is lifted from the bottom side to the top side by the lifting rod 16 by the rotation of the rotary cylinder 13, and then its own weight. In the process of falling to the bottom, it is dried by being moved toward the outlet 13b while being exposed to the drying gas. In addition, the sludge is crushed to a predetermined size by the crushing stirring blade 20 that rotates integrally with the rotation of the rotating shaft 18.
[0015]
The dried sludge dried to the required moisture content (for example, 40%) in the drying furnace 12 is supplied to the rotating cylinder 37 of the carbonization furnace 26 via the transfer device 32. The inside of the rotary cylinder 37 is heated by the auxiliary combustion burner 40 to be in a dry distillation state. Therefore, dry distillation gas is generated from the dry sludge supplied to the rotary cylinder 37, and this gas is supplied from a dry distillation gas supply pipe 39. It is ejected into the primary combustion chamber 34a. And by burning the dry distillation gas injected into the primary combustion chamber 34a, the inside of the rotary cylinder 37 is maintained in a dry distillation state, and the internal dry sludge is carbonized. Note that the auxiliary burner 40 may be turned off after the inside of the rotary cylinder 37 is maintained in the dry distillation state by the combustion of the dry distillation gas.
[0016]
That is, in the drying furnace 12, the sludge is crushed while being dried from a moisture content of 80% to 40%, and the carbonized furnace 26 is configured to carbonize the dried sludge while rotating the rotary cylinder 37, so that fine carbide is produced. can do. Moreover, it becomes possible to manufacture carbides having an arbitrary particle diameter by changing the number of rotations of the rotary shaft 18 and the like. For example, as a soil conditioner used in horticulture or the like, a material having a size of about 5 mm is suitable, and a carbide having such a particle size can be obtained without crushing in a subsequent process.
[0017]
The unburned gas that could not be burned in the primary combustion chamber 34a of the carbonization furnace 26 was supplied to the secondary combustion chamber 35a from the through hole 36 and burned, and was generated in the secondary combustion chamber 35a. The high-temperature drying gas is supplied to the drying furnace 12 through the exhaust gas pipe 27 and used for drying sludge. Deodorization is performed by completely burning the unburned gas that could not be burned in the primary combustion chamber 34a in the secondary combustion chamber 35a.
[0018]
The treated gas cooled by sludge heat exchange inside the drying furnace 12 is discharged from the exhaust port 12b and introduced into the dust collector 23 through the first return pipe 22, where dust is removed. . The treated gas from which dust has been removed by the dust collector 23 is discharged to the second return pipe 24 connected to the exhaust port 23b of the dust collector 23. In the process in which the gas passes through the heat exchanger 30 disposed in the second return pipe 24, heat exchange is performed with the high-temperature drying gas flowing through the bypass pipe 29 branched from the exhaust gas pipe 27. Then, the treated gas whose temperature has been raised is returned to the secondary combustion chamber 35 a of the carbonization furnace 26. The treated gas returned to the secondary combustion chamber 35a is heated so that it is reused as a drying gas after deodorization. Note that the drying gas that has exchanged heat with the heat exchanger 30 is discharged to the outside through the bypass pipe 29. This gas is deodorized by the combustion in the secondary combustion chamber 35a as described above. Therefore, it does not pollute the external environment.
[0019]
That is, since the high-temperature gas generated in the carbonization furnace 26 is supplied to the drying furnace 12 and used for drying, it is not necessary to provide an independent hot air generation furnace, and the equipment cost and running cost can be reduced. The apparatus can be downsized. Furthermore, since the deodorized gas is removed by returning the treated gas discharged from the drying furnace 12 to the carbonization furnace 26 and heated, there is no need to provide a separate deodorizing furnace on the exhaust side of the drying furnace 12, and the equipment cost can be reduced. In addition, the size of the apparatus can be further reduced.
[0020]
[Example of change]
FIG. 6 shows a schematic configuration of the carbonization processing apparatus according to the modified example, and the quantitative supply device 11 connected to the receiving hopper 10 in which sludge is stored is connected to the granulation facility 51, and the quantitative supply device 11. Is configured to continuously supply sludge to the granulation facility 51. The granulation equipment 51 is connected to the carbonization furnace 26 having the same configuration as that described in the above embodiment, and the sludge granulated to the required diameter by the granulation equipment 51 is supplied to the rotating cylinder 37 of the carbonization furnace 26. It has become. That is, in the carbonization processing apparatus shown in FIG. 6, drying and carbonization of sludge are performed in the carbonization furnace 26, whereby the drying furnace can be omitted, and further downsizing of the apparatus can be achieved. In addition, by granulating the sludge supplied to the carbonization furnace 26 in advance with the granulation equipment 51, the sludge inside the carbonization furnace 26 is transferred to the inside, and efficient carbonization is achieved.
[0021]
In addition, a heat exchanger 53 is inserted in an exhaust gas pipe 52 that discharges high-temperature gas generated in the carbonization furnace 26 to the outside, and another heat used by the heat exchanger 53 in the factory using waste heat. It is possible to heat combustion air and the like.
[0022]
Here, when the sludge is supplied to the drying furnace 12 and the granulation equipment 51 by the quantitative supply device 11, the sludge is compressed and becomes difficult to disperse in the supply pipeline, and the sludge is supplied to the drying furnace 12 and the granulation equipment 51. May be processed as a large lump without being dispersed. In this case, it is difficult for heat to be transferred to the inside of the sludge, and it takes a long time to process or a defective product that is not carbonized inside is produced. Therefore, for example, as shown in FIG. 7, it is recommended to dispose a cross-shaped dispersion member 56 on the discharge-side tube 54 in the quantitative supply device 11. According to this configuration, the sludge transported through the pipe body 54 is dispersed in a cross shape by the dispersing member 56, and the sludge is supplied to the drying furnace 12 and the granulating equipment 51 in a state that can be easily dispersed. In addition, as shown in FIG. 8, the dispersion | distribution member 59 comprised by extending the piano wire 58 in the radial direction of the semicircular support member 57 is arrange | positioned in the pipe body 54, and the sludge to which the pipe body 54 is conveyed May be dispersed by the piano wire 58.
[0023]
In the above-described embodiments, the case where the drying kiln and the carbonizing furnace are the rotary kiln type has been described. However, the present application is not limited to this, and various types of types can be adopted. Further, in the embodiment, the case where two primary furnace bodies divided in the interior of the furnace body in the carbonization furnace are described, but one primary furnace body is provided over substantially the entire length in the furnace body. It may be arranged. Furthermore, the carbonization furnace may be a direct combustion system instead of the dry distillation system.
[0024]
【The invention's effect】
As described above, the sludge carbonization apparatus according to the present invention is configured to supply the high-temperature gas generated in the carbonization furnace to the drying furnace and use it for drying the sludge. It is not necessary to provide a hot-air generating furnace, which can reduce equipment costs and running costs, and can reduce the size of the apparatus. In addition, since deodorization is performed by returning the gas discharged from the drying furnace to the carbonization furnace and heating it, it is not necessary to provide a deodorization furnace, which can also reduce equipment costs and running costs. It is possible to reduce the size. Furthermore, since the gas after treatment after drying the sludge in the drying furnace is heat-exchanged by the heat exchanger, the gas after treatment heated to the carbonization furnace can be returned.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a carbonization apparatus according to a preferred embodiment of the present invention.
FIG. 2 is a longitudinal sectional front view showing a schematic configuration of a drying furnace according to an embodiment.
FIG. 3 is a longitudinal side view showing a schematic configuration of a drying furnace according to an embodiment.
FIG. 4 is a longitudinal sectional front view showing a schematic configuration of a carbonization furnace according to an embodiment.
FIG. 5 is a longitudinal side view showing a schematic configuration of a carbonization furnace according to an embodiment.
FIG. 6 is a schematic configuration diagram of a carbonization apparatus according to a modification.
FIG. 7 is an explanatory view showing a dispersion member employed in the constant amount supply device of the embodiment.
FIG. 8 is an explanatory view showing another example of the dispersing member employed in the constant amount supply device of the embodiment.
[Explanation of symbols]
12 Drying furnace 12a Intake port 12b Exhaust port 22 First return pipe ( return pipe )
24 Second return pipe ( return pipe ) 26 Carbonization furnace
27 Exhaust gas pipe 29 Bypass pipe
30 Heat Exchanger 33a Exhaust Port 34a Primary Combustion Chamber 35a Secondary Combustion Chamber 35b Inlet Port 37 Rotating Tube (Cylinder)

Claims (4)

Drying furnace to dry the sludge (12), said drying furnace (12) is constructed from the carbonization furnace to carbonize the supplied dried sludge (26) from the drying furnace inlet of (12) (12a) Carbonization treatment in which the exhaust port (33a) of the carbonization furnace (26) is connected in communication, and the high-temperature gas generated in the carbonization furnace (26) is supplied to the drying furnace (12) so as to dry the sludge. In the device
The drying furnace (12) of the exhaust port and (12b) communicatively connected to the carbonization furnace air inlet (26) (35b), a drying oven carbonizing furnace dry processed gas sludge in (12) (26) A sludge carbonization apparatus characterized by deodorizing by heating . In a carbonization treatment apparatus comprising a drying furnace (12) for drying sludge, and a carbonization furnace (26) for carbonizing the dried sludge supplied from the drying furnace (12),
A cylinder (37) that is inserted into the carbonization furnace (26) and supplied with dried sludge dried in the drying furnace (12),
A first combustion chamber (34a) defined to communicate with the outside of the cylinder (37) and combusting dry distillation gas generated inside the cylinder (37);
The second combustion is defined so as to communicate with the first combustion chamber (34a) inside the carbonization furnace (26), and communicates with the intake port (12a) of the drying furnace (12) via the exhaust port (33a). Chamber (35a)
The high-temperature gas generated by burning the unburned gas that could not be burned in the first combustion chamber (34a) in the second combustion chamber (35a) is supplied to the drying furnace (12) to generate sludge. A sludge carbonization apparatus characterized by being configured to perform drying. The exhaust port (12b) of the drying furnace (12) is connected to the intake port (35b) of the second combustion chamber (35a) and the treated gas obtained by drying sludge in the drying furnace (12) is supplied to the second combustion chamber. The sludge carbonization apparatus according to claim 2 , wherein the deodorization is performed by heating at (35a). Carbonization furnace (26) Exhaust vent (33a) And the drying furnace (12) Air intake (12a) Exhaust gas pipe to connect (27) Branching from the exhaust pipe (27) Carbonizing furnace that distributes (26) Bypass pipe that introduces part of the hot gas generated in (29) The drying oven (12) Exhaust vent (12b) And carbonization furnace (26) Air intake (35b) Return pipe to connect (22,24) Heat exchanger inserted in (30) The treated gas is connected to a carbonization furnace (26) Heat exchanger and heat exchanger (30) Heat exchange and heat up in a carbonization furnace (26) The sludge carbonization apparatus according to claim 1 or 3, wherein the carbonization treatment apparatus is returned to the above.

Images