JP2001294856A - Method for manufacturing ground improving material and equipment for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To down size a rotary kiln, inhibit the adhesion of fine powder in a cyclone and manufacture a ground improving material having excellent performance. SOLUTION: In this method, a ground improving material is manufactured by agitating and pelletizing a mixture of a dehydrated cake of sludge and lime, throwing the particles into a fluidized bed furnace 20 using an exhaust gas of a down stream rotary kiln 28 as the fluidizing gas, drying, drying/ preheating or drying/burning organic material/baking the lime setting the particles as bed material, and then introducing the particles from the fluidized bed furnace 20 to the rotary kiln 28 and baking then cooling the baked particles by introducing the baked particles to a fluidized bed cooler 38. The method collects dusts by introducing the exhaust gas of the fluidized bed furnace 20 into a jacket structured fluidized bed furnace cyclone 48 and indirectly cooling the cyclone 48 by introducing air to the jacket, separating the dusts by introducing the exhaust gas of the kiln 28 to a jacket structured kiln cyclone 33 and cooling the cyclone 33 by introducing air to the jacket and indirectly cooling the jacket.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a dewatered cake of sewage sludge or industrial waste sludge mixed with lime such as quicklime or slaked lime, dehydrated and dried, granulated, dried in a fluidized bed furnace, incinerated with organic matter, and slaked lime. Method and apparatus for producing ground improvement material by heat treatment such as decomposition and then firing in a rotary kiln, in particular, to reliably prevent dust adhesion by cooling the inner wall of cyclone to recarbonation temperature or lower The present invention relates to a method and an apparatus for manufacturing a ground improvement material that can be used as a ground improvement material.

[0002]

2. Description of the Related Art Sewage sludge, industrial waste sludge, etc. have been dewatered and dried and then incinerated in a fluidized bed furnace or a rotary kiln to incinerate organic matter in the sludge and landfilled. Various recycling methods for performing the above are being developed. Conventionally, as a method and an apparatus for dehydrating, drying and incinerating sludge, for example, Japanese Patent Application Laid-Open No. 6-15297 discloses a dehydration and drying step of mixing sludge and quicklime to dehydrate and dry sludge; A dewatering / drying / incineration system for sludge comprising an incineration / regeneration step of heating in a furnace or an airflow furnace to incinerate organic matter in the sludge and burning slaked lime by the heat of combustion of the organic matter to regenerate into quicklime is disclosed.

JP-A-10-237852 discloses an organic sludge such as sewage sludge mixed with lime such as quicklime and slaked lime, and granulating the mixture to a size of 1 to 10 mm. There is disclosed a method for producing a ground improvement material by drying, dehydrating, burning organic matter, and firing slaked lime at a temperature of ~ 1000 ° C.

[0004]

The above-mentioned Japanese Patent Application Laid-Open No. 6-15 / 1994
In the dewatering / drying / incineration system for sludge described in Japanese Patent No. 297, the residence time in a fluidized bed furnace or an airflow furnace is short, so that it cannot be sufficiently fired and the performance as a ground improvement material cannot be satisfied. In addition, there is a problem that the fine powder of quicklime is re-carbonated and re-hydroxylated and adheres to the inside of the apparatus, so that long-term continuous operation cannot be performed. Also, Japanese Patent Application Laid-Open No. 10-2378
In the method for producing a ground improvement material described in JP-A-52-52, since the rotary kiln has poor heat transfer performance, the apparatus becomes large in dry baking, dehydration, incineration, and baking of the rotary kiln alone, and dust in the kiln exhaust gas is reduced. There is a problem that it adheres to the heat exchanger, hinders continuous operation, and requires a great deal of labor to remove the adhered matter.

The present invention has been made in view of the above points, and an object of the present invention is to dry, dry, preheat or dry, incinerate, incinerate, and slak lime a granulated material (raw material) in a fluidized-bed furnace having high heat transfer performance. By performing firing (decomposition), the rotary kiln can be miniaturized, a ground improvement material with good performance can be manufactured, and dust adhesion to the inner wall surface of the cyclone can be reliably prevented. And a device. Another object of the present invention is to heat the odor generated in a granule (raw material) manufacturing plant by exchanging heat with a cyclone exhaust gas in a fluidized bed furnace using a heat exchanger, and then use the rotary kiln as combustion air for the rotary kiln. Another object of the present invention is to provide a method and an apparatus for producing a soil improvement material that can reliably perform odor treatment by blowing air into a wind box and / or a freeboard portion of a fluidized bed furnace.

[0006]

In order to achieve the above object, a method for producing a ground improvement material according to the present invention comprises mixing a lime with a sludge dewatered cake, stirring and granulating the sludge dewatered cake with a downstream rotary kiln. Into a fluidized bed furnace using the flue gas of the fluidized gas as a fluidizing gas, and drying, drying and preheating or drying, incineration of organic matter, and calcination of slaked lime (decomposition) using the granulated material as a fluidized medium. This is a method in which the mixture is introduced into a rotary kiln, fired, and fired granules (a mixture of incinerated ash and CaO) are introduced into a fluidized bed cooler for cooling. Dust is collected by being introduced into the layered furnace cyclone, and a cooling fluid is introduced into the jacket to cool the cyclone by indirect cooling (see FIG. 1). As the cooling fluid, air, water, or the like is used, and it is particularly preferable to use air.

In the above method, dust collected in the fluidized-bed furnace cyclone is blown into the vicinity of a burner of the rotary kiln, preferably from a kiln above the burner.
It is preferable that the sintering be carried out before being discharged together with the kiln exhaust gas (see FIG. 1). In addition, it is preferable that the exhaust gas from the rotary kiln is partially or wholly introduced into a kiln cyclone having a jacket structure to separate dust, and that a cooling fluid is introduced into the jacket to cool the cyclone by indirect cooling (FIG. 1). reference). In this case as well, air, water and the like are used as the cooling fluid, but it is particularly preferable to use air.

In the cyclone, in the temperature range of 600 to 800 ° C., the calcined powder entrained in the exhaust gas and the carbon dioxide contained in the exhaust gas undergo a recarbonation reaction.
Fine powder such as calcium carbonate is generated by this reaction, and hard deposits tend to be formed on the inner wall of the cyclone in this temperature range, whereby continuous operation cannot be performed for a long period of time. Therefore, the inner wall temperature of the fluidized bed furnace cyclone and kiln cyclone is not more than 600 ° C., preferably 550 ° C.
Cool down to below ℃.

In these methods, the particle size of the granulated product is 1 to 20 mm, preferably 2 to 10 mm, which is suitable for fluidized bed operation. Further, it is preferable that after removing the exhaust gas from the fluidized bed furnace with the cyclone in the fluidized bed furnace, the exhaust gas from the cyclone in the fluidized bed furnace is introduced into a heat exchanger to recover heat (see FIG. 1). Further, it is preferable that the exhaust gas from the heat exchanger is introduced into a bag filter to collect dust, and the collected dust is blown into the vicinity of a burner of a rotary kiln together with dust from a cyclone in a fluidized bed furnace (see FIG. 1). ). By doing so, the yield can be further increased.

[0010] Further, the odor generated in the production process of the granulated material, that is, in the raw material production plant, is introduced into the heat exchanger and the temperature is increased.
It is preferable that the heated odor is recovered as combustion air for the rotary kiln, and the excess heated odor is blown into a wind box and / or a free board portion of the fluidized bed furnace to deodorize (see FIG. 1). In order to blow the heated odor into the wind box of the fluidized bed furnace, it is blown into the bottom of the rotary kiln, into the kiln cyclone, or directly into the wind box of the fluidized bed furnace. Further, the amount of heated odor blown into the rotary kiln, and the amount of heated odor blown into the wind box of the fluidized bed furnace and / or
Alternatively, it is preferable that the amount of the heated odor blown into the freeboard portion of the fluidized bed furnace can be adjusted. Further, it is preferable that the dust collection efficiency of the kiln cyclone is made larger than the dust collection efficiency of the fluidized bed furnace cyclone. With this configuration, the circulation of the fine powder in the system is eliminated, and the stable operation can be continued.

The apparatus for manufacturing a soil improvement material according to the present invention is characterized in that a sludge dewatered cake and lime are kneaded and granulated, and the granulated material is used as a fluid medium for drying, drying / preheating or drying / incineration of organic matter. A fluidized bed furnace for performing slaked lime firing, a rotary kiln for introducing and firing the particulate matter from the fluidized bed furnace, a fluidized bed cooler for cooling the fired granular matter from the rotary kiln, and a rotary kiln. A kiln cyclone partially or entirely connected to the kiln butt via a rotary kiln exhaust gas conduit, a kiln cyclone exhaust gas conduit for connecting the kiln cyclone and a wind box of a fluidized bed furnace, A fluidized bed furnace cyclone, part or all of which has a jacket structure, for introducing exhaust gas from a bed furnace and separating dust, and an exhaust gas from the fluidized bed furnace cyclone. A heat exchanger for introducing and recovering heat, a bag filter for introducing exhaust gas from the heat exchanger to separate dust, a lower part of the fluidized bed furnace cyclone and a burner of the rotary kiln, preferably a burner And a cyclone collecting dust introduction means for connecting the kiln to the upper kiln (see FIG. 1).

In the above apparatus, the lower portion of the bag filter is connected to the cyclone trapping dust introducing means or the kiln near the burner of the rotary kiln, preferably above the burner via a bag filter collecting dust supply pipe. Preferably (see FIG. 1). Further, it is preferable to provide a kneader for kneading the sludge dewatered cake and lime and a granulator for granulating the kneaded material from the kneader (see FIG. 1).

The kiln cyclone and the fluidized bed furnace cyclone have an exhaust gas inlet for introducing exhaust gas in a tangential direction at the upper part and a substantially inverted conical body at the lower part of a cylindrical body having an exhaust gas discharge pipe at the center of the upper surface. An enlarged wall portion is continuously provided at a lower portion of the substantially inverted conical body, and a substantially inverted conical body portion is continuously provided on the enlarged wall portion. A lower end inner diameter D1 of the substantially inverted conical body and an exhaust gas discharge pipe are provided. Has a relationship of D1 ≧ d, and a relationship of D2 = (0.8 to 1.0) × D between the inside diameter D of the cylindrical body and the inside diameter D2 of the lower end portion of the enlarged wall portion. It is preferable to use a highly efficient cyclone (see FIG. 2).

As the heat exchanger, it is preferable to use a heat exchanger having a structure in which a heat transfer tube for passing an odor and heating it is arranged vertically (see FIG. 3). Further, as a gas dispersion plate for a fluidized bed furnace, a plurality of small holes having a diameter of 3 times or less, preferably 2 times or less the diameter of the fluidized medium are provided on the top wall of a large number of cylindrical bodies fixed through the plate. It is preferable to use one having a given structure (see FIGS. 4 and 5). Further, it is preferable that an auxiliary burner is provided near the upper side of the gas dispersion plate of the fluidized-bed furnace so that the odor can be deodorized even at startup (see FIG. 1).

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described. However, the present invention is not limited to the following embodiments, and can be implemented with appropriate modifications. FIG. 1 shows an apparatus for manufacturing a ground improvement material according to a first embodiment of the present invention. Reference numeral 10 denotes a raw material (granulated material) manufacturing plant, which includes a kneader 12, a granulator 14, and the like. The sludge dewatered cake and limes, for example, quick lime, are put into the kneader 12 and kneaded. Quicklime absorbs water and becomes slaked lime,
Further, the moisture of the sludge dewatered cake is evaporated by an exothermic reaction. The proportion of quicklime is selected so that the water content of the kneaded material is suitable for granulation, and the granulated material has a strength that does not break in the fluidized bed. Depending on the properties of the sludge dewatered cake, for example, the water content of the kneaded material is 20 to 30%. The kneaded material is introduced into a granulator 14 and granulated to a particle size of 1 to 20 mm, preferably 2 to 10 mm. In addition, by using a kneading machine having a granulation function, it is also possible to configure so that kneading and granulation are simultaneously performed by one apparatus.

The granulated material (raw material) from the granulator 14 is temporarily stored in a hopper 16 and then supplied to a fluidized bed furnace 20 by a feeder, for example, a belt feeder 18. Fluidized bed furnace 20
Is equipped with a wind box 22 at the bottom and a gas distribution plate 24 at the top of the wind box.
A fluidized bed 26 in which the granulated material becomes a fluidized medium is formed on the upper side of the fluidized bed. Exhaust gas from a rotary kiln 28 described later is introduced into the wind box 22 through a rotary kiln exhaust gas conduit 31, a kiln cyclone 33, and a kiln cyclone exhaust gas conduit 35, and is used as a fluidizing gas.

Granules (raw materials) charged into the fluidized bed furnace 20
Is fluidized by exhaust gas introduced from the rotary kiln 28 via the kiln cyclone 33, and drying, or drying and preheating, or drying and incineration of organic matter in sludge and calcination of slaked lime (decomposition) are performed. The granular material (processed material) from the fluidized bed furnace 20 is charged into the kiln butt 34 of the rotary kiln 28 via an airtight discharge mechanism, for example, an L valve 32, and is put into the rotary kiln 28 at 800 to 1000 ° C, preferably 850 to 90 ° C.
It is fired at a temperature of 0 ° C. 36 is a kiln burner.
The fired granules (mixture of incinerated ash and CaO) fired in the rotary kiln 28 are charged into a fluidized bed cooler 38, cooled by cooling air, discharged by a discharger, for example, a rotary feeder 40, and manufactured by a transporter 42. It is carried out as. Exhaust gas from the fluidized bed cooler 38 is introduced into the bag filter 44 to separate dust (finely burned material), and then discharged to the atmosphere. The collected dust is transported 4
2 is carried out as a part of the product. 46 is a pushing blower.

Exhaust gas from the fluidized bed furnace 20 is introduced into a fluidized bed furnace cyclone 48 to collect dust, and exhaust gas from the fluidized bed furnace cyclone 48 is introduced into a heat exchanger. As the fluidized bed furnace cyclone 48 and the kiln cyclone 33, for example, as shown in Utility Model Registration No. 252152, a part or all of the cyclone has a cooling jacket structure, that is, a double structure. A cyclone having a structure in which a cooling fluid, for example, air is supplied to the portion to cool the portion is used. 91, 9
3 is a cooling fan. By sending cooling air to the jackets of the fluidized bed furnace cyclone 48 and the kiln cyclone 33 to cool the inner wall temperature of the cyclone to 600 ° C. or lower, preferably 550 ° C. or lower, By cooling, adhesion of fine powder such as calcium carbonate can be reliably prevented,
Stable operation becomes possible.

The heat exchanger is preferably provided in two stages in series with the exhaust gas flow. Hereinafter, a case where the heat exchanger is provided in two stages will be described. The odor generated in the raw material manufacturing factory 10 is introduced into the heat exchanger 50 on the high temperature side by the odor fan 54, and the cooling air (atmosphere) is introduced into the heat exchanger 52 on the low temperature side by the forced blower 56. Exhaust gas from the low-temperature side heat exchanger 52 is exhausted by an exhaust gas inducing fan 58.
Is introduced into the bag filter 60, where the dust is separated and then discharged from the chimney 62. A part of the odor heated by the heat exchanger 50 on the high temperature side is
The combustion air is blown into the vicinity of or directly into the burner 36 of the rotary kiln, and the odor components are burned or decomposed and deodorized in the rotary kiln. The remainder of the odor heated by the high-temperature side heat exchanger 50 is blown into the kiln butt 34 of the rotary kiln, the kiln cyclone 33 or the wind box 22 of the fluidized bed furnace, or is blown into the free board section 64 of the fluidized bed furnace. It is deodorized.

When the heat exchanger has two stages, the amount of heat recovery is reduced, but the size of the apparatus is reduced (the heat transfer area is 1/3 to 1/4).
The exhaust gas temperature can be kept constant by adjusting the amount of cooling air. For this reason,
There is an advantage that the bag filter on the downstream side can be protected and stable operation can be continued.

The branched pipes 66, 68, 70 for the heated odor from the heat exchanger 50 on the high temperature side are provided with valves 72, 7 respectively.
4 and 76 are provided, and the amount of the heated odor blown into or near the burner 36 of the rotary kiln 28, and the amount of the heated odor to the kiln butt 34, kiln cyclone 33 or wind box 22 of the fluidized bed furnace of the rotary kiln. Blow volume and / or
Alternatively, the amount of the heated odor to be blown into the freeboard portion 64 of the fluidized bed furnace can be adjusted. In this way, since the distribution of the odor can be adjusted, the temperature of each part is adjusted to a temperature at which dust is not attached, that is, for example, a fluidized bed furnace box 750 to 800 ° C or higher, and a heat exchanger inlet 550 to 600 ° C or lower. Can be set to

The dust separated by the fluidized bed furnace cyclone 48 is discharged to a dust conveying pipe 78 by a discharger, for example, a rotary feeder 77, and is blown by, for example, a roots blower 79, near the burner 36 of the rotary kiln, for example, a kiln above the burner. And fired before being discharged together with the kiln exhaust gas. In this case, the rotary feeder 77, the roots blower 79, and the dust transfer pipe 7
8, a cyclone collecting dust introduction means is constituted. Part of the dust collected by the bag filter 60 downstream of the heat exchangers 50 and 52 is extracted to the outside through a dust extraction pipe 80 in order to avoid dust circulation, and the remaining dust is removed. Is blown into the vicinity of the burner 36 of the rotary kiln, for example, into the kiln above the burner via the bag filter collecting dust supply pipe 81.

The dust collected by the kiln cyclone 33 is discharged to a dust conveying pipe 85 by a discharger, for example, a rotary feeder 83, and is blown by, for example, a roots blower 8.
7 to be conveyed to the product tank and collected. As the product tank, only one unit for both coarse and fine powders may be used, or two tanks for the coarse and fine powders may be used.
The coarse particles from the fluidized bed cooler 38 are transported to a coarse particle tank,
The fine dust collected by the bag filter 44 downstream of the fluidized bed cooler and the fine dust collected by the kiln cyclone 33 may be transported to a fine powder tank.

Further, in order to prevent the fine powder from circulating in the system and perform a stable operation, it is preferable that the dust collecting efficiency of the kiln cyclone 33 be higher than that of the fluidized bed furnace cyclone 48.

Further, it is necessary to maintain the thermal efficiency by reducing the adhesion of dust in the heat exchangers 50 and 52. Therefore, the fluidized bed furnace cyclone 48 and the kiln cyclone 33
For example, a high-efficiency cyclone (commercial cyclone) as disclosed in Japanese Utility Model Publication No. 7-46357
It is preferable to use As shown in FIG. 2, the high-efficiency cyclone has an exhaust gas inlet 82 for introducing exhaust gas in a tangential direction on the upper side, and a substantially inverted cylinder body 86 having an exhaust gas discharge pipe 84 in the center of the upper surface. A conical body 88 is continuously provided, an enlarged wall portion 90 is continuously provided below the substantially inverted conical body 88, and a substantially inverted conical body portion 92 is continuously provided on the enlarged wall portion 90. Lower end inside diameter D
1 and the inner diameter d of the exhaust gas discharge pipe 84 have a relationship of D1 ≧ d, and D2 = (0.8 to 1.0) between the inner diameter D of the cylindrical body 86 and the lower end inner diameter D2 of the enlarged wall portion 90. It is configured to have a relationship of × D. By using the cyclone having such a structure, dust in exhaust gas from the fluidized bed furnace 20 and the rotary kiln 28 can be efficiently collected. When this high-efficiency cyclone is used, it is used in a jacket structure as described above.

As the heat exchanger 50, as shown in FIG. 3, it is preferable to use a heat exchanger having a structure in which a heat transfer tube 94 for passing an odor and heating it is arranged vertically.
With this configuration, the amount of dust attached and deposited is small, and cleaning is easy. Note that the heat exchanger 52 on the low temperature side preferably has the same structure. Further, as the gas dispersion plate 24 of the fluidized bed furnace 20, for example, a dispersion plate having a special structure as disclosed in Japanese Utility Model Publication No. 7-37113 is preferably used. As shown in FIGS. 4 and 5, the dispersion plate having this special structure has a large number of cylindrical bodies 98 fixed through the plate body 96.
Is provided with a plurality of small holes 102 whose diameter is three times or less, preferably two times or less, the diameter of the fluid medium. By using the dispersion plate having such a structure, hot banking in which the fluid medium is maintained at a high temperature becomes possible. The auxiliary burner 1 is located near the upper side of the gas distribution plate 24.
04 is preferably provided. With such a configuration,
The odor can be deodorized when the rotary kiln cannot be operated, such as during startup or trouble.

[0027]

As described above, the present invention has the following effects. (1) Since the raw material (granulated material) is dried or dried and preheated, or dried, incinerated and burnt (decomposed) of slaked lime in a fluidized bed furnace with high heat transfer performance, the rotary kiln downstream is downsized. In addition to this, the cyclone has a jacket structure and the inner wall surface of the cyclone is cooled to a temperature not higher than the recarbonation temperature, so that adhesion of fine powder can be reliably prevented, and stable operation can be performed. (2) Since the raw material is a granulated material, the granulated material itself becomes a fluid medium, and no other fluid medium is required. In addition, a compact, high-efficiency fluidized bed cooler can be used as the cooler. (3) Since the treated material from the fluidized bed furnace can be fired in a rotary kiln for a sufficient time, a high quality ground improvement material can be obtained. (4) Heat consumption can be reduced by heating the odor with the exhaust gas of the fluidized bed furnace and recovering heat. (5) When adjusting the distribution of the odor, the temperature of each part can be set to a temperature at which dust does not adhere. Further, since the temperature of each part can be set to a temperature at which deodorization can be performed, odor treatment can be reliably performed. (6) When the dust collection efficiency of the kiln cyclone is made larger than the dust collection efficiency of the fluidized-bed furnace cyclone, the circulation of fine powder in the system is eliminated, and stable operation becomes possible. (7) When the exhaust gas from a fluidized bed furnace is removed by a cyclone with high dust collection efficiency, dust adhesion in the heat exchanger is greatly reduced, and the heat efficiency can be maintained and long-term continuous operation can be performed. . (8) When a heat exchanger in which the heat transfer tubes are arranged vertically is used, dust is less likely to adhere and accumulate and cleaning is easy. (9) When a gas dispersion plate having a special structure is used, hot banking can be performed. Therefore, the start / stop operation can be performed in a short time, and the operation at the time of abnormality is easy. (10) When an auxiliary burner is provided in a fluidized bed furnace, odor can be deodorized at the time of startup or trouble.

[Brief description of the drawings]

FIG. 1 is a systematic schematic configuration diagram showing an apparatus for manufacturing a ground improvement material according to a first embodiment of the present invention.

FIG. 2 is an elevational view showing an example of the cyclone in FIG. 1;

FIG. 3 is an elevational view showing an example of the heat exchanger in FIG. 1;

FIG. 4 is an explanatory sectional view showing an example of a gas dispersion plate of the fluidized bed furnace in FIG.

FIG. 5 is a plan view of a main part of the gas dispersion plate in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Raw material manufacturing plant 12 Kneader 14 Granulator 16 Hopper 18 Belt feeder 20 Fluidized bed furnace 22 Wind box 24 Gas dispersion plate 26 Fluidized bed 28 Rotary kiln 31 Rotary kiln exhaust gas conduit 32 L valve 33 Kiln cyclone 34 Kiln end 35 Kiln cyclone Exhaust gas conduit 36 Kiln burner 38 Fluidized bed cooler 40, 77, 83 Rotary feeder 42 Transporter 44, 60 Bag filter 46, 56 Push-in blower 48 Fluidized bed furnace cyclone 50, 52 Heat exchanger 54 Odor fan 58 Exhaust gas inducing fan 62 Chimney 64 Free Board section 66, 68, 70 Branch pipe for heated odor 72, 74, 76 Valve 78, 85 Dust transfer pipe 79, 87 Roots blower 80 Dust extraction pipe 81 Bag filter collection dust supply pipe 82 Exhaust gas inlet 84 Exhaust gas exhaust 86 cylindrical body 88 substantially inverted conical body 90 expanded wall portion 91, 93 cooling fan 92 substantially inverted cone trunk portion 94 the heat transfer tube 96 plate body 98 the cylindrical body 100 top wall 102 small holes 104 auxiliary burner

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court ゛ (Reference) C04B 7/47 C04B 7/47 (72) Inventor Mikio Murao 2-4 Kawanishidori, Nagata-ku, Kobe Kawasaki Engineer F-term in Ring Co., Ltd. (Reference) 4D059 AA03 BB01 BB02 BB06 BB13 BB14 BE00 BK01 BK09 CA10 CA14 CA16 CA30 CB30 CC10 DA04 4G012 KD04 KD06 4H026 CA02 CC06

Claims (17)

[Claims] 1. A granulated material obtained by mixing and agitating lime to a sludge dewatered cake, and granulating the sludge dewatered cake into a fluidized bed furnace using the exhaust gas of a downstream rotary kiln as a fluidizing gas, and drying and drying the granulated material as a fluid medium.・ After performing preheating or drying, incineration of organic matter, and calcination of slaked lime, a method of introducing granular materials from a fluidized bed furnace into a rotary kiln and calcining the same, introducing the calcined granular materials into a fluidized bed cooler and cooling, The exhaust gas from the fluidized bed furnace is partially or entirely introduced into a cyclone having a jacket structure to collect dust, and a cooling fluid is introduced into the jacket to cool the cyclone indirectly. Manufacturing method of ground improvement material. 2. The method according to claim 1, wherein exhaust gas from the rotary kiln is partially or entirely introduced into a kiln cyclone having a jacket structure to separate dust, and a cooling fluid is introduced into the jacket to cool the cyclone by indirect cooling. A method for producing the ground improvement material as described above. 3. The dust collected in a fluidized-bed furnace cyclone is blown into the vicinity of a burner of a rotary kiln, fired before being discharged together with kiln exhaust gas, collected by the kiln cyclone and collected as a product. 3. The method for producing the ground improvement material according to 1 or 2. 4. The method for producing a ground improvement material according to claim 3, wherein the fluidized-bed furnace cyclone and the kiln cyclone are cooled so that the inner wall temperature is 600 ° C. or less. 5. The method for producing a ground improvement material according to claim 1, wherein the particle size of the granulated product is 1 to 20 mm. 6. The exhaust gas from a fluidized bed furnace cyclone is dust-removed in a fluidized bed furnace cyclone, and then the exhaust gas from the fluidized bed furnace cyclone is introduced into a heat exchanger to recover heat. Manufacturing method of ground improvement material. 7. The exhaust gas from a heat exchanger is introduced into a bag filter to collect dust, and the collected dust is blown together with dust from a cyclone in a fluidized bed furnace near a burner of a rotary kiln. Method of manufacturing ground improvement material. 8. An odor generated in the process of producing the granulated product is introduced into a heat exchanger and heated to recover the heated odor as combustion air for a rotary kiln. The method for producing a ground improvement material according to any one of claims 1 to 7, wherein the deodorization is performed by blowing into a wind box and / or a free board portion. 9. The amount of heated odor blown into the rotary kiln;
The method for producing a ground improvement material according to claim 8, wherein the amount of the heated odor blown into the wind box of the fluidized bed furnace and / or the amount of the heated odor blown into the freeboard portion of the fluidized bed furnace are adjusted. 10. The dust collection efficiency of a kiln cyclone is made larger than the dust collection efficiency of a fluidized bed furnace cyclone.
A method for producing the ground improvement material as described above. 11. A fluidized bed furnace for kneading and granulating sludge dewatered cake and lime, feeding granules, and using the granules as a fluid medium for drying, drying and preheating or drying, incineration of organic matter and calcination of slaked lime. A rotary kiln for introducing and firing the particulate matter from the fluidized bed furnace; a fluidized bed cooler for cooling the fired particulate matter from the rotary kiln; and a rotary kiln exhaust gas conduit at the bottom of the rotary kiln. A kiln cyclone partially or wholly configured in a jacket structure, a kiln cyclone exhaust gas conduit for connecting the kiln cyclone to the wind box of the fluidized bed furnace, and an exhaust gas from the fluidized bed furnace. Fluidized-bed furnace cyclone, part or all of which is configured in a jacket structure, for separating dust by heating, and for introducing heat from the fluidized-bed furnace cyclone to recover heat. A heat exchanger, a bag filter for introducing exhaust gas from the heat exchanger to separate dust, and a cyclone collecting dust introducing means for connecting a lower part of the fluidized bed furnace cyclone and a vicinity of a burner of the rotary kiln. An apparatus for manufacturing a ground improvement material. 12. The apparatus for manufacturing a ground improvement material according to claim 11, wherein a lower portion of the bag filter and a portion near the cyclone dust collecting means or a burner of the rotary kiln are connected via a bag filter collecting dust supply pipe. 13. The production of a ground improvement material according to claim 11, comprising a kneader for kneading the sludge dewatered cake and lime, and a granulator for granulating the kneaded material from the kneader. apparatus. 14. A kiln cyclone and / or a fluidized bed furnace cyclone having an exhaust gas inlet for introducing exhaust gas in a tangential direction at an upper portion and a substantially inverted lower portion of a cylindrical body having an exhaust gas discharge pipe at the center of the upper surface. Conical fuselage is connected,
An enlarged wall section is connected to the lower part of this substantially inverted conical body,
A substantially inverted conical body is connected to the enlarged wall, and a lower end inner diameter D1 of the substantially inverted conical body and an inner diameter d of the exhaust gas discharge pipe have a relationship of D1 ≧ d. Lower end inside diameter D
13. A high-efficiency cyclone having a relationship of D2 = (0.8 to 1.0) .times.D with the second cyclone.
Or a manufacturing apparatus for a ground improvement material according to 13. 15. The heat exchanger according to claim 1, wherein the heat exchanger has a structure in which heat transfer tubes for passing odor and heating the odor are arranged vertically.
An apparatus for manufacturing a ground improvement material according to any one of 1 to 14. 16. A structure in which a gas dispersion plate of a fluidized bed furnace is provided with a plurality of small holes having a diameter of three times or less the diameter of a fluid medium in a top wall portion of a large number of cylindrical members fixedly penetrating through the plate members. Claim 1
An apparatus for manufacturing a ground improvement material according to any one of 1 to 15. 17. The apparatus for manufacturing a soil improvement material according to claim 11, wherein an auxiliary burner is provided near the upper side of the gas dispersion plate of the fluidized bed furnace.