JPH09210330A - Sludge drying and burning method and its equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To completely burn sludge and reduce dust in waste gas after burned. SOLUTION: A sludge drying/burning method is adapted such that sludge is put into a drying furnace 10, and the dried sludge is burned in an incinerator 11. In the method, upper and lower belt conveyors 23 to 25 composed of a multi-stage heat resistant and corrosion-resistant metal endless belt are provided in the drying furnace 10, to which conveyors hot air is blown, and sludge is molded into a thin plate shape, and is then dried with hot air and heating with heat transfered from the endless belt of the belt conveyors 23 to 25 in a process where the sludge is carried on the belt conveyors 23 to 25.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a sludge drying / incineration method and equipment capable of efficiently drying and incinerating even sludge containing water.

[0002]

2. Description of the Related Art Conventionally, vertical multistage furnaces have been widely used as incinerators for sewage sludge and food sludge (hereinafter referred to as "sludge") which are flame-retardant wastes. However, due to the incineration capacity and increased calorie of sludge, the problem of consumption of arm cheese etc. due to the rise in furnace temperature occurs, so at present, the incinerator is
The mainstream is a flow furnace or a stoker furnace, which is used as a high-efficiency dryer by separating the upper drying section of the multi-stage furnace from the incineration section.

[0003]

However, these fluidized furnaces and stoker furnaces still have the following problems to be solved. That is, in the case of a fluidized furnace, a large amount of waste gas and dust are generated, so a separate waste gas treatment facility is required, which increases the equipment cost. On the other hand, in the stoker furnace, since sludge is not sufficiently stirred, unburned materials remain in the incinerated ash after incineration. The present invention has been made in view of the above circumstances, and is a method for drying and incinerating sludge that can reduce the amount of dust in waste gas after incineration and that can achieve complete combustion of sludge. And its equipment.

[0004]

According to the present invention, there is provided a semiconductor device comprising:
The method for drying and incinerating sludge described is a method for drying and incinerating sludge in which the sludge is put in a drying furnace to be dried, and the dried sludge is incinerated by an incinerator, and hot air is blown from above in each of the drying furnaces. A belt conveyor consisting of endless belts made of multi-stage heat-resistant and corrosion-resistant metal is provided above and below to be sprayed, and the sludge is formed into a thin plate, and then the hot air and the belt are conveyed on the belt conveyor. It is dried by heat transfer from the endless belt of the conveyor.

The method for drying and incinerating sludge according to claim 2 is as follows:
The method for drying and incinerating sludge according to claim 1, wherein rods made of porous ceramics are arranged in a multi-stage grid pattern in the incinerator, and the sludge charged in the incinerator is arranged in an upper stage. It is contact-dried by the rod made of the porous ceramics, dropped through the gap between the rods made of the porous ceramics assembled in the multi-stage grid, and completely burned. In the method for drying and incinerating sludge according to claim 3, in the method for drying and incinerating sludge according to claim 1 or 2, waste gas from the incinerator is used as hot air in the drying oven. The sludge drying / incineration facility according to claim 4,
A drying furnace that dries sludge formed into a thin plate, an incinerator that incinerates the sludge supplied from the drying furnace, and dust in waste gas from the incinerator is removed and supplied to the drying furnace. A sludge drying / incineration facility having a waste gas treatment system, in the drying furnace, a multi-stage type in which a lower belt conveyor directly receives thin plate sludge falling from an upper belt conveyor and horizontally conveys it. A belt conveyor consisting of endless belts made of heat-resistant and corrosion-resistant metal is provided, and further, on the inlet side of the drying furnace, a thin plate molding machine for extruding sludge as a raw material into a thin plate shape and cutting it at a predetermined length is provided. It is provided.

The sludge drying / incineration facility according to claim 5 is
5. The sludge drying / incineration facility according to claim 4, wherein the lower part of the incinerator is gradually reduced in diameter and an ash discharge port is provided at the lower end, and a rod made of porous ceramics is provided inside the incinerator. The materials are arranged in a multi-stage mesh, and a combustion burner for igniting the sludge that is thrown in is provided in the lower part of the incinerator. The sludge drying / incineration facility according to claim 6 is the sludge drying / incinerator according to claim 4 or 5, wherein the heat-resistant and corrosion-resistant metal endless belt of the belt conveyor is made of a stainless plate.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Next, referring to the attached drawings, an embodiment in which the present invention is embodied will be described to provide an understanding of the present invention.

First, with reference to FIG. 1, the construction of a sludge drying / incineration facility A which can be suitably used in the sludge drying / incineration method according to one embodiment of the present invention will be described. As is clear from the overall layout of the sludge drying / incineration facility A shown in FIG. 1, the sludge drying / incineration facility A
Is substantially composed of a drying furnace 10 which is a former device and an incinerator 11 which is a latter device. A thin plate forming machine 13 is arranged in the sludge charging section 12 of the drying furnace 10, and a dry sludge charging port 15 of the incinerator 11 is arranged below the drying sludge outlet 14 of the drying furnace 10. There is. In addition, incinerator 1
1 is provided with a combustion waste gas outlet 16 on its side wall,
This combustion waste gas outlet 16 has a gravity dust collector 17 in the middle thereof.
The cyclone 18 and the hot air discharge blower 19 are connected to a closed space 21 formed inside the drying furnace 10 through a hot air supply pipe 20 attached thereto.

The construction of each part of the sludge drying / incineration facility A having the above-mentioned basic construction will be described in detail below with reference to FIGS. 1 and 2. First, the configuration of the drying furnace 10 will be described. As shown in FIGS. 1 and 2, the drying furnace 10
Has a long box-shaped casing 22,
In the closed space 21 formed inside the casing 22, a plurality of belt conveyors 23 to 25 using endless belts 23a to 25a made of a stainless steel plate, which is an example of a plate made of heat-resistant and corrosion-resistant metal, are arranged in the horizontal longitudinal direction. They are arranged in a stretched state and in a state of being laminated in multiple stages.
A sludge transfer device is constituted by these belt conveyors 23 to 25. As shown in the figure, the intermediate belt conveyor 24 projects rightward from the upper belt conveyor 23, and has a first sludge transfer surface 26 formed on the upper surface thereof. On the other hand, the lower belt conveyor 25 projects to the left of the middle belt conveyor 24 and has a second
The sludge transfer surface 27 is formed.

With this construction, the sludge transferred from the thin plate molding machine 13 onto the upper belt conveyor 23 is
Belt conveyor 23 in the upper stage → first sludge transfer surface 26 → belt conveyor 24 in the middle stage → second sludge transfer surface 27 → through belt conveyor 25 in the lower stage through dry sludge outlet 14 continuously on a long sludge drying path Will be transferred to. Further, in the space formed between the upper belt conveyor 23 and the upper wall of the box type casing 22 and the space formed between these belt conveyors 23 to 25, respectively, a long hot air blowing pipe is provided. 28 to 30 are provided. And, these hot air blowing pipes 28-
30 forms a hot air blowing device. Further, the hot air supply pipes 2 to 30 are respectively provided at the start end sides of the hot air supply pipes 28 to 30.
It is connected to the end of 0.

At the start end side of each hot air blowing pipe 28-30, an air volume adjusting damper 31 for adjusting the amount of hot air blown to each belt conveyor 23-25, respectively.
~ 33 are attached. The hot air supply pipe 20
Further, an extension portion 20a is provided at the end of
The end of the extended portion 20a is connected to the middle of the hot air discharge pipe 34 connected to the upper opening of the drying furnace 10.
In addition, an air volume adjusting damper 35 is attached to the middle of the extension portion 20a.

As shown in FIG. 2, the belt conveyors 23-
The drive device of No. 25 is to attach the sprocket wheels 36 to 38 to the drive side pulleys of the belt conveyors 23 to 25,
Moreover, the sprocket wheel 4 is attached to the output shaft of the drive motor 39.
0 for these sprocket wheels 36-3
It is configured by winding an endless chain 41 around the parts 8 and 40. Incidentally, 41a is an idler wheel.
With such a configuration, all the belt conveyors 23 to 25 can be simultaneously driven by one drive motor 39. Of course, the belt conveyors 23 to 25 can also be driven by individually provided drive motors.

As shown in FIG. 2, each belt conveyor 23
To 25 driven side pulleys 42 to 44 are connected to tension cylinders 45 to 47, respectively, and these tension cylinders 45 to 47 correspond to the endless belts 23a to 25a of the belt conveyors 23 to 25 due to thermal expansion. The belt conveyor 2 automatically absorbs fluctuations in tension.
3 to 25 drive side pulleys 42 to 44 and the endless belt 23a
It is possible to prevent the occurrence of slippage between the sheet 25a and the sheet 25a.

Next, the structure of the thin plate forming machine 13 provided in the sludge charging section 12 of the drying furnace 10 will be described. As shown in FIGS. 1 and 2, the thin plate forming machine 13 connects a hopper 49 provided on the sludge charging section 12 of the drying furnace 10 with a sludge charging port 48, and an upper end opening to a lower part of the hopper 49. At the same time, a sludge introducing pipe 52 whose lower part is bent toward the upper belt conveyor 23, a sludge vertical pusher 53 arranged in the hopper 49, and a sludge horizontal extruder 54 arranged in the lower part of the thin plate forming machine 13. And attached to the tip of the sludge introduction pipe 52 to form the sludge into a thin plate, and then the belt conveyor 2
The sludge forming plate 55 that can be fed to the upper part 3 and the cutting device 56 that cuts the thin plate-shaped sludge into a certain length.

Next, the structure of the incinerator 11 will be described. As shown in FIG. 1 and FIG. 3, the incinerator 11 is composed of a cylindrical container in which a refractory 58 is provided on the inner surface of a cylindrical outer reinforcing iron plate 57 having a conical portion whose lower portion is gradually reduced in diameter.
A combustion chamber (primary air reservoir chamber) 60 is formed inside thereof. A disk-shaped perforated plate 61 made of an iron plate is provided in the lower portion of the combustion chamber 60, and rod members 62 made of porous ceramics are alternately provided on the perforated plate 61.
They are combined and laminated in a grid pattern in multiple stages. A sufficient gap is formed between the rod members 62 made of the combined porous ceramics. In addition,
Sintered alumina or the like can be used as the porous ceramics. In addition, in the lower conical portion of the cylindrical container 59,
Several combustion burners 63 are arranged. Therefore, the dry sludge charged from the dry sludge charging port 15 is dried and burned while sequentially touching the rod 62 made of porous ceramics from above, and thereafter, even if the burning by the combustion burner 63 is stopped. , Rod material 6 made of porous ceramics
The dried sludge is burned by the heat held by 2, and is discharged from the ash discharge port 64 through the disk-shaped perforated plate 61 at the lowermost end.

Further, as shown in FIG. 3, a cylindrical container 59 is provided.
A gravitational dust collector 17 is installed side by side. The gravity dust collector 17 has its inner space partitioned by a shielding wall 66, and has an ash removal chamber (secondary air reservoir chamber) 67 and a dry air chamber (tertiary air reservoir chamber) 68 formed therein. Then, the combustion chamber 60 and the ash removal chamber (secondary air reservoir chamber) 67 are connected to each other through the combustion waste gas outlet 16 provided in the upper portion of the cylindrical container 59. Further, the ash removal chamber 67 is provided with an ash removal port 70 at the bottom thereof, while the dry air chamber 68 is provided at its upper part with a dry air suction port 71 which is communicatively connected to the start end of the hot air supply pipe 20. It is provided.

In such a structure, the hot air discharge blower 1
When the waste gas is sucked through the dry air suction port 71 by operating the exhaust gas 9, only the dry air, which is the waste gas, is burned into the combustion waste gas outlet 16
The ash removal chamber (secondary air storage chamber) 67 flows through the ash removal chamber 67, and the powder ash contained in the suction-dried air is dropped downward by the shielding wall 66 and taken out from the ash removal port 70. On the other hand, the dry air from which the ash has been removed passes through the dry air chamber (tertiary air chamber) 68, the dry air suction port 71 and the hot air supply pipe 20, and the hot air blowing pipes 28 to 30.
Sent to

Next, the sludge having the above structure is dried and
A method for drying and incinerating sludge using the incinerator A will be described. In the thin plate molding machine 13, high-concentration sludge, which has been mechanically removed in advance by a certain amount, is introduced into the sludge introducing pipe 52 through the sludge introducing port 48 and is pushed downward by the sludge vertical pushing device 53, and the sludge horizontal extruder is also provided. 54 and sludge forming plate 55 to form a thin plate having a predetermined thickness, and then cut into chips by a cutting device 56.
3 Transfer to above.

Thereafter, the chip-like sludge is sequentially transferred on the upper surfaces of the belt conveyors 23 to 25, and in the course of the transfer, the hot air from the hot air blowing pipes 28 to 30 and the endless belt 23a made of a stainless plate. ~
It is dried by heat transfer from 25a. In this drying step, in the present embodiment, after sludge is made into a thin plate shape, it is sequentially moved on belt conveyors 23 to 25 provided in multiple stages, and hot air is blown to the thin plate-like sludge at each belt conveyor 23 to 25. , I try to dry the sludge. Therefore, the amount of heat required for drying the sludge can be sufficiently given to the sludge. The dried sludge that has been sufficiently dried in this way is then discharged from the dried sludge outlet 14 of the drying furnace 10, and the dried sludge inlet 15 of the incinerator 11 is discharged.
It is thrown into the combustion chamber 60 of the cylindrical container 59, and dried and incinerated. In this incineration process, since the rod 62 made of porous ceramics has a heat storage effect in the incineration chamber 60, the thrown sludge can be dried in the upper part of the furnace, and then the burner 63 for combustion is used. Even if is stopped, the dried sludge can be naturally burned while falling to the lower part, the amount of dust in the waste gas can be reduced, and energy saving can be achieved by shortening the burning time. After that, ash-like incineration objects are continuously taken out from the ash discharge port 64 provided at the lower end of the incinerator 11.

On the other hand, the dry air which is the waste gas generated in the combustion chamber 60 of the incinerator 11 by the operation of the hot air discharge blower 19 is completely removed of dust by the gravity dust collector 17 and the cyclone 18. The hot-air blowing pipes 20 feed the hot-air blowing pipes 28 to 30, and the hot-air blowing pipes 28 to 30 feed the belt conveyors 23 to 30.
It will be sprayed on the thin-walled sludge transported on the 25. That is, the waste gas generated in the incinerator 11 can be effectively used, and energy saving can be achieved also from this aspect. Although the present invention has been described with reference to the sludge drying / incineration method and the equipment therefor according to the embodiment, the present invention describes the sludge drying / incineration method according to the embodiment.
It is not limited to the incineration method and its equipment,
For example, the following modifications are also included. That is, as the hot air blown to the sludge in the drying furnace, not only the waste gas generated by the incinerator but also the hot air obtained by using solar heat or boiler heat as a heat source can be used.

[0021]

EFFECTS OF THE INVENTION In the sludge drying / incineration method according to any one of claims 1 to 3 and the sludge drying / incineration facility according to any one of claims 4 to 6, the sludge is formed into a thin plate and a multi-stage heat-resistant and corrosion-resistant metal is used. Since it is transferred onto a belt conveyor consisting of endless belts, hot air is blown to the sludge in the process of being transported on the belt conveyor, and the sludge is dried by heat transfer heating from the hot air and the endless belt of the belt conveyor. , Can remove moisture in sludge efficiently and dry sufficiently,
The sludge drying load in the incinerator for the subsequent incineration can be remarkably reduced, and the sludge can be completely burned. Particularly, in the sludge drying / incineration method according to the second aspect of the present invention, the dried sludge is dropped downward through the gaps between the many rods made of porous ceramics in the incinerator. The sludge can be dried in the upper part of the incinerator using the heat storage of the rod made of porous ceramics, and can be spontaneously combusted while falling to the lower part, and the amount of dust in the waste gas can be reduced. .

In the method for drying and incinerating sludge according to claim 3, since waste gas generated by incineration in an incinerator can be used as the hot air, the waste gas can be effectively used and energy can be saved. Can be planned.

In the sludge drying / incineration facility according to claim 5, the lower part of the incinerator is gradually reduced in diameter and an ash discharge port is provided at the lower end, and a rod made of porous ceramics is provided inside the incinerator. Since the materials are arranged in a multi-stage grid, once the injected sludge is ignited by the combustion burner, even if the combustion burner is stopped, the heat of the rod made of porous ceramics accumulates the heat of the incinerator. Sludge can be further dried in the upper part, and the sludge after drying can be naturally burned only by the heat storage of the rod material made of porous ceramics, the sludge can be completely burned, and fuel consumption can be reduced. it can. In the sludge drying / incineration facility according to the sixth aspect, the service life of the belt conveyor can be extended by forming an endless belt made of a heat-resistant and corrosion-resistant metal of the belt conveyor from a stainless plate.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an overall configuration of a sludge drying / incineration facility that can be preferably used in a sludge drying / incineration method according to an embodiment of the present invention.

FIG. 2 is an enlarged explanatory view showing the configuration of the drying furnace.

FIG. 3 is an enlarged perspective sectional view showing the structure of the incinerator.

[Explanation of symbols]

A Sludge Drying / Incineration Facility 10 Drying Furnace 11 Incinerator 12 Sludge Injecting Section 13 Thin Plate Forming Machine 14 Dry Sludge Outlet 15 Dry Sludge Inlet 16 Combustion Waste Gas Outlet 17 Gravity Dust Collector 18 Cyclone 19 Hot Air Discharge Blower 20 Hot Air Sending Supply pipe 20a Extension part 21 Sealed space 22 Casing 23 Belt conveyor 23a Endless belt 24 Belt conveyor 24a Endless belt 25 Belt conveyor 25a Endless belt 26 First sludge transfer surface 27 Second sludge transfer surface 28 Hot air blowout pipe 29 Hot air blowout pipe 30 Hot air blow-out pipe 31 Air volume adjustment damper 32 Air volume adjustment damper 33 Air volume adjustment damper 34 Hot air exhaust piping 35 Air volume adjustment damper 36 Sprocket wheel 37 Sprocket wheel 38 Sprocket wheel 39 Drive motor 40 Sprocket wheel 1 Endless Chain 41a Idler Wheel 42 Driven Side Pulley 43 Driven Side Pulley 44 Driven Side Pulley 45 Tension Cylinder 46 Tension Cylinder 47 Tension Cylinder 48 Sludge Inlet 49 Hopper 52 Sludge Inlet Pipe 53 Vertical Sludge Pusher 54 Sludge Horizontal Extruder 55 Sludge forming plate 56 Cutting device 57 Outside reinforcing iron plate 58 Refractory 59 Cylindrical container 60 Combustion chamber 61 Perforated plate 62 Rod made of porous ceramics 63 Combustion burner 64 Ash discharge device 65 Ash removal device 66 Shield wall 67 Ash removal Chamber 68 Dry air chamber 70 Ash removal port 71 Dry air suction port

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toyoma Harada 3-6-1, Norimatsu, Hachimannishi-ku, Kitakyushu, Fukuoka Prefecture, Fukuoka Industrial Technology Center, Mechanical and Electronic Research Laboratory (72) Yusho Nakamura, Norimatsu, Norimatsu, Kitakyushu, Kitakyushu, Fukuoka 3 Chome 6-1 Fukuoka Prefectural Industrial Technology Center, Mechanical and Electronic Research Laboratory (72) Inventor Hiromi Yamamoto 3-6-1, Norimatsu, Hachimansai-ku, Kitakyushu, Fukuoka Prefecture Fukuoka Prefecture Industrial Technology Center, Mechanical and Electronic Research Laboratory (72) Inventor Hiroyuki Uchida Fukuoka Prefecture 1-1, Hirano, Hachimanto-ku, Kitakyushu City Kitakyushu International Technical Cooperation Association Environmental Cooperation Center

Claims (6)

[Claims] 1. A method for drying and incinerating sludge in which a sludge is placed in a drying oven to be dried, and the dried sludge is incinerated in an incinerator, wherein hot air is blown from above in each of the drying ovens in a multi-stage structure. A belt conveyor comprising an endless belt made of heat-resistant and corrosion-resistant metal of the formula is provided, and the sludge is formed into a thin plate shape, and then the hot air and the endless belt of the belt conveyor are conveyed in the process of being conveyed on the belt conveyor. Drying sludge characterized by being dried by heat transfer heating of
Incineration method. 2. A rod material made of porous ceramics is arranged in a multi-stage grid in the incinerator, and the sludge charged in the incinerator is placed in the upper stage and made of the porous ceramics. 2. The method for drying and incinerating sludge according to claim 1, wherein the sludge is contact-dried by means of the method described above, and is dropped downward through the gap between the rods made of the porous ceramics assembled in the multi-stage grid to completely burn it. 3. The method for drying and incinerating sludge according to claim 1 or 2, wherein waste gas from the incinerator is used as hot air in the drying oven. 4. A drying furnace for drying sludge formed into a thin plate, an incinerator for incinerating sludge supplied from the drying furnace, and dust for removing waste gas from the incinerator to remove the sludge. Drying sludge with waste gas treatment system to supply to the drying furnace
In the incinerator, in the drying furnace, a belt consisting of endless belt made of multi-stage heat-resistant and corrosion-resistant metal for horizontally transporting the thin plate sludge falling from the upper belt conveyor to the lower belt conveyor as it is A conveyor is provided, and further, on the inlet side of the drying furnace, a thin plate forming machine for extruding the raw material sludge into a thin plate shape and cutting the sludge into a predetermined length is provided. Drying / incineration facility. 5. The lower part of the incinerator is gradually reduced in diameter, and an ash discharge port is provided at the lower end, and rods made of porous ceramics are arranged in a multi-stage grid inside the incinerator. The sludge drying / incineration facility according to claim 4, wherein a combustion burner that ignites the sludge that is thrown in is provided in a lower portion of the incinerator. 6. The sludge drying / incineration facility according to claim 4, wherein the endless belt made of heat-resistant and corrosion-resistant metal of the belt conveyor is made of a stainless plate.