JPH1133599A - Carbonized sludge producing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize an apparatus and to reduce equipment costs and running costs. SOLUTION: One end of a supply pipe 21 the other end of which is connected to the outlet 17a of a hot air generating furnace 17 is connected to the suction port 12a of a drying furnace 12, the drying gas generated in the furnace 17 is supplied to the drying furnace 12. One end of an exhaust gas pipe 27 the other end of which is connected to the exhaust port 33a of a carbonization furnace 26 is connected to the inlet 17b of the furnace 17, high temperature exhaust gas generated in the carbonization furnace 26 is supplied to the furnace 17. In other words, exhaust gas containing unburned gas from the carbonization furnace 26 is supplied to the furnace 17, and the unburned gas is burned completely to remove odors.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing carbonized sludge, and more particularly, to a method in which sludge generated in a sewage treatment process in a sewage treatment facility is carbonized by dry distillation and used as a soil conditioner or the like. The present invention relates to a carbonized sludge production apparatus.

[0002]

2. Description of the Related Art Household sewage from general households, offices, department stores, restaurants and the like is treated in a sewage treatment facility, and in the process, sludge containing a large amount of organic matter is generated. After drying this sludge, it is further heated and carbonized, and the obtained carbide is used as a soil improving agent, a snow melting agent and the like. In an apparatus for carbonizing sludge, after supplying sludge (so-called “dehydrated cake”) to a drying furnace and drying it to a required moisture content, the dried sludge is supplied to a carbonizing furnace and subjected to a heat treatment, so that voids / It is configured to produce a porous carbide.

[0003]

In the carbonization furnace for carbonizing the dry sludge, dry distillation is performed to make the dry sludge in a steamed state, a combustion component is volatilized to generate a dry distillation gas, and the dry distillation gas is burned. A configuration is employed in which the inside of the carbonization furnace is kept in a dry distillation state. In this case, since the carbonized gas does not completely burn in the carbonization furnace, the exhaust gas containing unburned gas that has not been completely burned contains an odor.If this gas is discharged directly to the outside, the surrounding environment is polluted. Problem. Therefore, a deodorizing furnace is attached to the exhaust side of the exhaust gas in the carbonization furnace, and after the unburned gas contained in the exhaust gas discharged from the carbonization furnace is completely deodorized by being completely burned in the deodorizing furnace, it is discharged to the outside. It was configured as follows. However, in this case, since a deodorizing furnace is required as ancillary equipment, equipment costs are increased, and the entire apparatus is increased in size, and a large installation space is required. Further, it is pointed out that the cost of fuel and the like used in the deodorizing furnace increases, and that the overall running cost increases.

[0004]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned drawbacks inherent in the conventional carbonized sludge production apparatus, and has been proposed to solve the problem suitably. It is an object of the present invention to provide a carbonized sludge production apparatus capable of reducing equipment costs and running costs.

[0005]

SUMMARY OF THE INVENTION In order to overcome the above-mentioned problems and to achieve the initial object, a carbonized sludge producing apparatus according to the present invention comprises a drying furnace to which sludge is supplied, and a high-temperature drying furnace in the drying furnace. In a carbonized sludge manufacturing apparatus comprising a hot air generating furnace for supplying gas and dry sludge dried in the drying furnace, and a carbonizing furnace for carbonizing the dried sludge, the inside of the carbonizing furnace is defined. In the combustion chamber, a cylinder to which the dried sludge dried in the drying furnace is supplied is disposed in communication with the combustion chamber, and the carbonization gas generated inside the cylinder is burned in the combustion chamber. The combustion chamber and the hot-air generating furnace are connected to each other, and exhaust gas containing unburned gas that has not been completely burned in the combustion chamber is supplied to the hot-air generating furnace for combustion.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an apparatus for producing carbonized sludge according to the present invention will be described in detail with reference to the accompanying drawings with reference to preferred embodiments. FIG. 1 shows a schematic configuration of a carbonized sludge manufacturing apparatus according to an embodiment, and a receiving hopper in which sludge (a dehydrated cake having a water content of about 80%) transported from a sewage treatment facility by a truck or the like is stored. 10 is connected to a fixed amount supply device 11 such as a Mono pump (registered trademark). The quantitative supply device 11 is connected to a rotary kiln type drying furnace 12, and is supplied from the quantitative supply device 11 to the drying furnace 12.
Is continuously supplied with a predetermined amount of sludge. As shown in FIGS. 2 and 3, the drying furnace 12 has a cylindrical rotating cylinder 13 that is rotated in a predetermined direction by driving means (not shown).
At one end in the axial direction, a charging hopper 15 having a screw conveyor 14 incorporated therein is connected through a charging port 13a. Cylinder 13
It is supplied inside. Rotating cylinder 13
A plurality of lifting members 16 are disposed on the inner wall surface of the rotating cylinder 13 at a distance from each other in the circumferential direction.
Is moved toward the outlet 13b while repeating the process of being lifted from the bottom side to the top side by the lifting ridge 16 with the rotation and falling to the bottom by its own weight. In the process of sludge falling to the bottom, it comes into contact with a high-temperature (for example, about 700 ° C.) drying gas supplied from a hot-air generating furnace 17 described below,
The sludge is dried.

[0007] Inside the rotary cylinder 13, the rotary cylinder 1
A rotation shaft 18 is rotatably disposed at a position deviated from the center of the shaft 3, and the rotation shaft 18 is configured to be rotated in a predetermined direction by a drive motor 19. As shown in FIG. 2, a plurality of crushing and stirring blades 20 are disposed on the rotating shaft 18 so as to be spaced apart from each other in the axial direction. The sludge that has been lifted from the bottom side to the top side and then falls to the bottom by its own weight after it is lifted by 16 is finely crushed. The particle size of the dried sludge obtained in the drying furnace 12 can be arbitrarily set by changing the shape and the number of the crushing and stirring blades 20 and the number of rotations of the rotary shaft 18.

The other end of a supply pipe 21 having one end connected to the drying gas outlet 17a of the hot air generating furnace 17 is connected to the inlet 12a of the drying furnace 12. The hot air generating furnace 17 is supplied with LPG for a pilot burner, kerosene for a heating burner, and combustion air, heats the gas to a predetermined temperature to generate a drying gas, and supplies the high-temperature drying gas to a supply pipe. It is configured to supply to the drying furnace 12 through 21. One end of a first return pipe 22 is connected to an exhaust port 12 b of the drying furnace 12, and the other end of the first return pipe 22 is connected to an intake port 23 a of a dust collector 23. Further, a second return pipe 2 having one end connected to the exhaust port 23b of the dust collector 23
4 is connected to an exhaust gas pipe 27 described below which is connected to a gas inlet 17 b of the hot air generating furnace 17, and rotates a circulation blower 25 inserted in the second return pipe 24 so that the hot air generating furnace 17 The generated high-temperature drying gas is drawn into the drying furnace 12, and the processed gas from which dust has been removed by the dust collector 23 is returned to the hot-air generating furnace 17 via the exhaust gas pipe 27 and the inlet 17 b.

As shown in FIG. 1, a heat exchanger 30 to which a bypass pipe 29 branching from the supply pipe 21 is connected is inserted in the second return pipe 24. An exhaust blower 31 is provided at the outlet side of the heat exchanger 30 in the bypass pipe 29.
Is inserted, and the supply pipe 21 is rotated by rotating the blower 31.
Is introduced into the bypass pipe 29. That is, the post-treatment gas, which has undergone heat exchange in the drying furnace 12 and has been cooled, is heat-exchanged with the drying gas in the heat exchanger 30 and heated to the required temperature.
The heat is returned to the hot-air generating furnace 17. The flow rate of the drying gas supplied to the drying furnace 12 controls the rotation of the circulation blower 25 and the exhaust blower 31, and is transmitted to the adjustment valve 46 and the second return pipe 24 inserted in the supply pipe 21. By adjusting the interposed regulating valve 47 and the regulating valve 48 interposed in the bypass pipe 29, an optimum state is maintained.

The transfer device 3 is connected to the outlet 13b of the drying furnace 12
2 is connected, and the dried sludge dried to a required moisture 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 furnace bodies 34, 34 communicating with each other inside a furnace main body 33. The carbonizing furnace 26 has a cylindrical rotating cylinder (cylindrical body) 37 penetrated by two furnace bodies 34, 34.
Is rotatably supported, is configured to rotate in a predetermined direction by a drive motor 38, and the transfer device 32
The dried sludge transferred in the above is supplied through the inlet 37a. The rotary cylinder 37 is provided with a plurality of carbonized gas supply pipes 39 communicating with the combustion chamber 34a defined inside the furnace body 34, and the carbonized gas generated inside the rotary cylinder 37 is supplied to the combustion chamber 34a. It gushes out. Further, inside the furnace body 34, a plurality of auxiliary combustion burners 40 as a heating source are arranged, and the rotary cylinder 37 is heated by the burners 40 so as to be in a state in which a dry distillation gas can be generated (steaming state). You. And after the carbonization gas is generated,
By burning the carbonized gas spouted from the rotating cylinder 37 into the combustion chamber 34a, the inside of the rotating cylinder 37 is configured to be kept in a carbonized state. The furnace body 34 is supplied with LPG for a pilot burner and kerosene for an auxiliary burner, and the rotary cylinder 37 is supplied with enough oxygen (air) to maintain a dry distillation state. ing.

The other end of the exhaust gas pipe 27, one end of which is connected to an exhaust port 33a provided in the furnace main body 33, is connected to the inlet 17b of the hot air generating furnace 17, and the combustion in the combustion chamber 34a of the furnace body 34 is performed. The high-temperature exhaust gas generated by the above is configured to be supplied to the hot-air generating furnace 17 via the exhaust gas pipe 27. That is, the exhaust gas containing the unburned gas that has not been completely burned in the combustion chamber 34a is supplied to the hot-air generating furnace 17,
Remove odor by completely burning the unburned gas (deodorization)
I have to do it. Further, a supply blower 50 is inserted into the exhaust gas pipe 27, and the rotation of the blower 50 is controlled to adjust the supply amount of the exhaust gas to the hot air generator 17 and the internal pressure of the carbonization furnace 26. .

As shown in FIG. 5, a plurality of lifting members 42 are provided on the inner wall surface of the rotary cylinder 37 disposed in the carbonization furnace 26 and are spaced apart in the circumferential direction. The dried sludge is lifted from the bottom side to the top side by the lifting member 42 along with the rotation of the rotary cylinder 37, and is then moved toward the outlet 37b while repeating the process of falling to the bottom by its own weight. . The lifting member 42 is not an essential requirement, and may be omitted.

[0013]

Next, the operation of the carbonized sludge manufacturing apparatus according to the above-described embodiment will be described. The high-temperature drying gas generated in the hot-air generating furnace 17 is supplied to the outlet 17 a, the supply pipe 21, and the intake port 12 by the operation of the circulation blower 25.
It is sucked into the drying furnace 12 through a. Further, sludge continuously supplied from the quantitative supply device 11 to the drying furnace 12
(For example, a water content of 80%) is lifted from the bottom side to the top side by the lifting member 16 by the rotation of the rotary cylinder 13 and then falls to the bottom by its own weight. It is dried by being moved.
Further, the sludge is crushed into a predetermined size by the crushing and stirring blades 20 which are integrally rotated by the rotation of the rotating shaft 18.

In the drying furnace 12, a required water content (for example, 4
The dried sludge dried to 0%) is supplied to the rotary cylinder 37 of the carbonization furnace 26 via the transfer device 32. This rotating cylinder 3
The interior of 7 is heated and carbonized by the combustion burner 40 at the beginning of the operation, so that dry sludge gas is generated from the dry sludge supplied to the rotary cylinder 37, and this gas is supplied to the carbonization gas supply pipe. From 39, it blows out to the combustion chamber 34a. After the carbonized gas is stably jetted into the combustion chamber 34a, the inside of the rotary cylinder 37 is kept in a carbonized state by burning the carbonized gas in the combustion chamber 34a. The dried sludge is carbonized. Note that after the inside of the rotary cylinder 37 is kept in a carbonized state by the combustion of the carbonized gas, the auxiliary burner 40 may be turned off.

That is, the sludge is dried and crushed in the drying furnace 12 from a moisture content of 80% to 40%.
Since the dry sludge is carbonized while rotating the rotary cylinder 37 in the carbonization furnace 26, fine carbides can be produced. Further, by changing the number of revolutions of the rotating shaft 18 or the like, it is possible to produce carbide having an arbitrary particle size. For example, a soil improver used in horticulture or the like is preferably about 5 mm, and a carbide having such a particle size can be obtained without crushing in a later step.

The post-treatment gas, which has undergone heat exchange with sludge in the drying furnace 12 and has been cooled, is discharged from the exhaust port 12b and introduced into a dust collector 23 through a first return pipe 22, where dust is removed. Removed. The processed 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 after the treatment,
Heat exchange is performed between the high-temperature drying gas flowing through the bypass pipe 29 branched from the supply pipe 21, and the heated gas after the processing is returned to the hot-air generating furnace 17 via the inlet 17 b. . Then, the post-processing gas returned to the hot-air generating furnace 17 is burned and heated to a required temperature, so that it is reused as a drying gas. The high-temperature exhaust gas discharged from the carbonization furnace 26 is supplied to the exhaust gas pipe 2.
The hot air is supplied to the hot-air generating furnace 17 through the humidifier 7, where it is burned and deodorized.

That is, the post-treatment gas heated by using a part of the drying gas is returned to the hot-air generating furnace 17, and the high-temperature exhaust gas generated in the carbonizing furnace 26 is supplied to the hot-air generating furnace 17. With this configuration, energy saving in the hot air generator 17 can be achieved. Further, the combustion chamber 3 of the carbonization furnace 26
4a, the carbonized gas cannot be completely burned, so that the exhaust gas containing unburned gas that cannot be completely burned in the combustion chamber 34a discharged from the carbonization furnace 26 contains an odor. Deodorization is performed by completely supplying the generator 17 with unburned gas and burning it. Therefore, carbonization furnace 2
It is not necessary to provide a separate deodorizing furnace on the exhaust side of 6, so that equipment costs can be reduced and the size of the apparatus can be reduced. Furthermore, by combining the generation of the drying gas and the deodorization of the exhaust gas in the hot-air generating furnace 17, the fuel cost can be reduced, and the running cost can be reduced. Further, in the apparatus of the embodiment, deodorization of the post-treatment gas discharged from the drying furnace 12 is also performed in the hot air generation furnace 17.

In the embodiment, the case where the drying furnace and the carbonizing furnace are of a rotary kiln type has been described. However, the present invention is not limited to this, and various types can be adopted. In the embodiment, the case where two divided furnace bodies are provided inside the furnace body of the carbonization furnace has been described. However, one furnace body is provided over substantially the entire length inside the furnace body. Is also good.

[0019]

As described above, the apparatus for producing carbonized sludge according to the present invention supplies exhaust gas containing unburned gas discharged from the carbonizing furnace to the hot-air generating furnace and completely burns the unburned gas. With this configuration, the exhaust gas can be deodorized without providing an independent deodorizing furnace. In other words, there is no need to provide a separate deodorizing furnace on the exhaust side of the carbonizing furnace, so that equipment costs can be reduced and the size of the apparatus can be reduced. Further, by combining the generation of the drying gas and the deodorization of the exhaust gas in the hot-air generating furnace, the fuel cost can be reduced and the running cost can be reduced.

Further, by supplying high-temperature exhaust gas discharged from the carbonizing furnace to the hot-air generating furnace, energy is saved as compared with the case where the room-temperature air is always heated in the hot-air generating furnace to generate the drying gas. Can be achieved.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an apparatus for producing carbonized sludge according to a preferred embodiment of the present invention.

FIG. 2 is a vertical sectional front view showing a schematic configuration of a drying furnace according to an embodiment.

FIG. 3 is a vertical sectional side view showing a schematic configuration of a drying furnace according to an embodiment.

FIG. 4 is a vertical sectional front view showing a schematic configuration of a carbonization furnace according to an example.

FIG. 5 is a vertical sectional side view showing a schematic configuration of a carbonization furnace according to an example.

[Explanation of symbols]

 12 Drying furnace 17 Hot air generating furnace 26 Carbonization furnace 34a Combustion chamber 37 Rotating cylinder (cylindrical body) 40 Combustion burner (heating source)

 ──────────────────────────────────────────────────続 き Continued on the front page (71) Applicant 390008431 Takasago Industry Co., Ltd. 2321, 2321 Dachi-cho, Toki-shi, Gifu (72) Inventor Makoto Terunuma 12-12-607, Heihei-zuka, Kanagawa 12-12-607 (72) Invention Setsuya Morino 4-19, Rokuen-minami, Kakamigahara-shi, Gifu (72) Inventor Mikihiko Ohno 1717 north of Kitakata-cho, Motosu-gun, Gifu (72) Inventor Haruki Takai 2-1-7, Yoshiokacho, Owariasahi-shi, Owariasahi, Aichi Prefecture Inventor: Akira Kagohashi, 2231-2, Dachi-cho, Toki City, Gifu Prefecture, Japan 2 (72) Inventor Ryo Minoba, 2231-2, Dachi-cho, Toki City, Toki City, Gifu Prefecture 2 within Takasago Industry Co., Ltd. (72) Invention Person Kazuaki Yamaguchi 2231 Takachisago Industry Co., Ltd., Dachi-cho, Toki-shi, Gifu

Claims (2)

[Claims] 1. A drying furnace (12) to which sludge is supplied, and a hot-air generating furnace (17) for supplying a high-temperature drying gas to the drying furnace (12).
And, dried sludge dried in the drying furnace (12) is supplied,
In a carbonized sludge manufacturing apparatus comprising a carbonization furnace (26) for carbonizing the dried sludge, a combustion chamber (34a) defined inside the carbonization furnace (26) is dried in the drying furnace (12). Cylinder to which dried sludge is supplied (37)
The carbonized gas generated inside the cylinder (37) is burned in a combustion chamber (34a), and the combustion chamber (34a) of the carbonization furnace (26) and the hot air generation The furnace (17) is connected in communication, and the exhaust gas containing unburned gas that has not been completely burned in the combustion chamber (34a) is supplied to the hot air generating furnace (17) for combustion. Sludge production equipment. 2. The carbonized sludge production apparatus according to claim 1, wherein the inside of the cylindrical body (37) is carbonized by a heating source (40) to generate carbonized gas from the dried sludge.