JP2003207270A - Treatment device of oil contaminated soil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To sufficiently purify contaminated soil by making fuel consumption of a burner as little as possible, and effectively removing oil contents in the contaminated soil. <P>SOLUTION: This treatment device 1 of contaminated soil comprises a rotary kiln 2 drying and heating oil contaminated soil (treatment material) M inserted into the inside by a quantitative feeder (material supply device) 3 to evaporate oil contents; a deodorant furnace (combustion furnace) 5 introducing exhaust gas including evaporated oil contents discharged from the rotary kiln 2 via a refractory-lined duct 4 and combusting the oil contents in the exhaust gas; an exhaust gas cooling device 7 introducing and cooling the exhaust gas exhausted from the deodorant furnace 5 via a duct 6; a bag filter (dust collector) 9 collecting the dust in exhaust gas introduced from the exhaust gas cooling device 7 via a duct 8; and a chimney 12 releasing the exhaust gas from the bag filter 9 to the atmosphere. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for treating oil-contaminated soil which purifies oil-contaminated soil by heating and burning oil.

[0002]

2. Description of the Related Art Conventionally, as an apparatus of this type, as shown in FIG. 11, while burning a burner 101 of a rotary kiln 100, contaminated soil containing oil and the like introduced by a conveyor 102 is heated and contaminated. Volatile components such as oil in the soil are separated, and the exhaust gas containing the volatile components is discharged to the exhaust duct 103.
After sending the dust to the dust collector 104 to collect dust, the first heat exchanger 105
Of the high temperature deodorizing furnace exhaust gas sent to the first heat exchanger 105 from the deodorizing furnace 106 through the duct 107 and then introduced into the deodorizing furnace 106, and burned and decomposed by the burner 108 in the deodorizing furnace 106. Further, the second heat exchanger 1 in which the deodorizing furnace exhaust gas from the deodorizing furnace 106 is provided in the duct 107 downstream of the first heat exchanger 105.
09, and then discharged from the chimney 110, and in the second heat exchanger 109, from the fan 111 to the ducts 112, 11
The air sent to the burner 108 of the deodorizing furnace 106 and the burner 101 of the rotary kiln 100 through 3, 114 is heated, thereby reducing the fuel consumption of each burner 101, 108 and economically purifying the contaminated soil. Such a method is known (Japanese Patent Laid-Open No. 2001-232343).

[0003]

However, in the conventional treatment apparatus for contaminated soil, the treatment material (contaminated soil) is dried and heated by the combustion heat of the burner 101 in the rotary kiln 100 to remove the oil content in the treatment material. Although it is vaporized and burned in the deodorization furnace 106, since the heating temperature in the rotary kiln 100 is limited to around 350 ° C., lubricating oil other than light oil such as kerosene, heavy oil such as heavy oil, etc. Complains that it cannot be vaporized and separated from the treated material.

The rotary kiln 100 has a burner 1
Since the treatment material (contaminated soil) is input from the side opposite to 01 and the treatment material is heated by the countercurrent method,
The temperature of the treatment material on the input side is low, and if the treatment material is high water content soil or clay soil, the rotary kiln 1
No. 00 adheres to the inner wall surface, heat exchange is impaired, and the treatment material cannot be sufficiently dried and heated. From this point as well, there is a problem that the oil component cannot be completely separated from the treatment material. Further, the vaporized oil content adheres to the filter cloth or the like of the dust collector 106 due to the decrease in temperature, which causes a large pressure loss and may cause an ignition, which hinders safe operation. Further, the dust collector 106 needs to employ an expensive filter cloth having high heat resistance.

Further, in the conventional apparatus for treating contaminated soil, the deodorizing furnace 106 for burning the exhaust gas containing the vaporized oil from the rotary kiln 100 has a horizontal structure and does not have a mechanism for separating dust in the exhaust gas. It is necessary to install a dust collector 104 in the exhaust duct 103 before the deodorizing furnace 106 to collect dust in the exhaust gas. When the dust collector 104 is provided in this way, the temperature of the exhaust gas is lowered in the dust collector 106, so that the burner 101 consumes more fuel because the exhaust gas is burned at a high temperature in the deodorizing furnace 106.

The present invention has been made in view of the above-mentioned circumstances, and the fuel consumption in the burner is reduced as much as possible to effectively remove the oil component in the contaminated soil to improve the purification of the contaminated soil. An object is to provide a contaminated soil treatment device that can be used.

[0007]

The present invention is characterized by the following points in order to solve the above problems. That is,
The apparatus for treating contaminated soil according to claim 1 introduces the oil-contaminated soil from a charging hopper provided at one end of a rotary kiln that rotates around an axis by a material supply device, and dry-heats it by the combustion heat of a drying burner. The oil in the contaminated soil is evaporated by means of this, and the soil purified by evaporation of the oil is taken out from the discharge chute provided at the other end of the rotary kiln, and the exhaust gas containing the evaporated oil is sent to the combustion furnace to burn the combustion furnace burner. Treatment of the oil-contaminated soil, which is made to be discharged from the chimney through a dust collector after heating the air supplied to the drying burner with the heat of the exhaust gas by passing the exhaust gas generated in the combustion furnace through a heat exchanger. In the apparatus, the rotary kiln scrapes and drops contaminated soil on its inner wall surface from one end portion on the input hopper side over a region of a predetermined axial length. A plurality of flights are provided at intervals in the circumferential direction of the rotary kiln, and a refractory lining is provided over the remaining area from the area where the flights are provided to the other end on the discharge chute side, and It is characterized in that a drying burner is provided on the hopper side and an auxiliary combustion burner is provided on the discharge chute side.

A treatment apparatus for polluted soil according to a second aspect is the treatment apparatus according to the first aspect, wherein the combustion furnace burner and the auxiliary combustion burner are heated by the heat of exhaust gas from the combustion furnace by a heat exchanger. It is characterized by being supplied.

A treatment apparatus for polluted soil according to a third aspect is the treatment apparatus according to the first or second aspect, wherein the air heated by the heat of the exhaust gas from the combustion furnace in the heat exchanger is inside the one end side of the rotary kiln. It is characterized in that the oil is supplied to the lower inside of the combustion furnace as combustion air.

A treatment apparatus for contaminated soil according to a fourth aspect is the treatment apparatus according to any one of the first to third aspects, wherein the rotary kiln has a plurality of irregularities formed on a free edge thereof along the axial direction of the flight. In addition, a large number of irregularities are formed on the inner surface of the refractory lining.

A treatment apparatus for contaminated soil according to a fifth aspect is the treatment apparatus according to any one of the first to fourth aspects, in which the combustion furnace is formed in a vertical cylindrical shape, and a refractory material is lined on the inner wall portion. A furnace body, a dust discharge mechanism provided on the bottom of the furnace body in a funnel shape, a combustion furnace burner provided on the furnace body, and exhaust gas from a rotary kiln provided on the furnace body is centrifugally collected inside the furnace body. It is characterized in that it is provided with a processing gas inlet for enabling operation and a heat exchanger provided at an exhaust port in the upper part of the furnace body.

A treatment apparatus for contaminated soil according to a sixth aspect is the treatment apparatus according to any one of the first to fifth aspects, wherein the material supply device has a hopper for introducing the contaminated soil and a bottom opening portion of the hopper. A feeder that is provided to send out the contaminated soil in the hopper to the outside, a guide hopper that discharges the contaminated soil provided at one end of the feeder, and a swivel breaker that scrapes the contaminated soil sent from the feeder into the guide hopper. It is characterized by having.

According to a seventh aspect of the present invention, in the treatment apparatus for contaminated soil according to the sixth aspect, the hopper is formed in an inverted quadrangular pyramid shape with a wide material inlet at the top and a narrow outlet at the bottom. The discharge port is eccentric in the lateral direction with respect to the material input port, and is formed so as to gradually widen toward the outlet side of the feeder.

According to an eighth aspect of the present invention, in the treatment apparatus for contaminated soil according to the sixth aspect, the swivel breaker has a plurality of rod-shaped rods in a circumferential direction and an axial direction on a rotary shaft rotated by a drive unit. It is characterized in that the members are attached at a predetermined interval and the projecting length of the rod-shaped member from the rotation axis to the outer peripheral direction is adjustable.

A treatment apparatus for contaminated soil according to a ninth aspect is the treatment apparatus according to any one of the first to eighth aspects, wherein exhaust gas from the combustion furnace is cooled between the combustion furnace and the dust collector. An exhaust gas cooling device having a dust discharging mechanism is provided at the lower end.

An apparatus for treating contaminated soil according to claim 10 is
The processing apparatus according to claim 9, wherein the exhaust gas cooling device is provided between a vertical tubular device body closed by an upper end plate and a lower end plate, and a lower end plate connected to a lower portion of the device body. A funnel-shaped bottom forming an exhaust gas turn-up space, the dust discharge mechanism provided in communication with the bottom, and a cylindrical body that is connected to the upper part of the apparatus main body and has the upper part closed and the lower part opened. The plate is divided into two parts, one of which forms an exhaust gas introducing chamber for introducing the exhaust gas from the combustion furnace between the upper end plate and the other end, and the other part between the upper end plate and the upper end plate. An exhaust gas inlet / outlet box which forms an exhaust gas outlet chamber for sending exhaust gas to a dust collector, is provided so as to span the upper end plate and the lower end plate, and connects the exhaust gas introduction chamber and the folded space of the exhaust gas, and Fold-back space and the exhaust gas outlet chamber A plurality of pipes to contact, is characterized in that it comprises supplying cooling water in the internal space, and a cooling water circulation device for circulating between the upper end plate and the lower end plate of the apparatus main body.

An apparatus for treating contaminated soil according to claim 11 comprises:
At least 1 of the dust discharge mechanism of a combustion furnace, the dust discharge mechanism of an exhaust gas cooling device, and the dust discharge mechanism provided in the lower part of the dust collector in the processing apparatus of Claim 9 or 10.
One is connected to a clean soil removal section from the rotary kiln.

An apparatus for treating contaminated soil according to claim 12 is
The processing apparatus according to any one of claims 1 to 11,
A cooling mixer provided with mixing blades rotated by a rotation drive device was provided inside a mixer casing capable of storing water in a lower part on one end side of a slanted bottom part, and provided on an upper part on one end side of the cooling mixer. The material inlet is connected to the discharge chute of the rotary kiln, the exhaust outlet provided at the upper end on the other end side is connected to the dust collector through the dust collecting duct, and the lower part of the other end side is the mixing blade from the one end side to the other end. It is characterized in that a material outlet for taking out the purified soil sent to the side is provided.

The treatment apparatus for contaminated soil according to claim 13 is
According to a twelfth aspect of the present invention, the dust collecting duct is provided with a cyclone dust collector.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an apparatus for treating contaminated soil according to an embodiment of the present invention will be described with reference to the drawings. Figure 1
In the above, reference numeral 1 is a treatment apparatus for contaminated soil according to an embodiment of the present invention. This contaminated soil treatment apparatus 1 is a rotary kiln 2 for drying and heating contaminated soil (treatment material) M contaminated with oil introduced therein, and a quantitative supply device (material for feeding contaminated soil into the rotary kiln 2). Deodorizing furnace (combustion furnace) 5 that introduces exhaust gas containing vaporized oil discharged from the rotary kiln 2 through the refractory lined duct 4 and burns the oil contained in the exhaust gas. An exhaust gas cooling device 7 for introducing and cooling the exhaust gas discharged from the deodorizing furnace 5 through the duct 6, and collecting dust in the exhaust gas introduced from the exhaust gas cooling device 7 through the duct 8. It is provided with a bag filter (dust collector) 9 and a chimney 12 that discharges the exhaust gas sucked from the bag filter 9 by the blower 10 through the duct 11 to the atmosphere.

A first heat exchanger (heat exchanger) 13 and a second heat exchanger (heat exchanger) 14 are provided in series in the duct 6 communicating with the exhaust port of the deodorizing furnace 5. The air blown from the first blower 15 is heated and heated by the exhaust gas from the deodorizing furnace 5 in the first heat exchanger 13, and then the deodorizing furnace burner (combustion furnace burner) of the deodorizing furnace 5 is passed through the heat insulation exterior duct 16. ) 17, a burner 18 for drying the rotary kiln 2
And the burner 19 for combustion support, and the second blower 20
The air blown from the second heat exchanger 14 is heated by the exhaust gas from the deodorizing furnace 5 to be heated and heated, and then the lower inner portion of the deodorizing furnace 5 and the rotary kiln 2 via the heat insulating exterior duct 21.
Oil is supplied as combustion air to the inside of one end side (material input side) of the.

Further, the dust discharging mechanism 2 of the deodorizing furnace 5
2. The dust discharge mechanism 23 of the exhaust gas cooling device 7 and the dust discharge mechanism 24 of the bag filter 9 are cooling mixers of a purified soil collecting device 26 for collecting the purified soil discharged from the rotary kiln 2 via the dust screw conveyor 25, respectively. After being contacted with 27, the captured dust is mixed with purified soil in the cooling mixer 27, and then the conveyor 26
a through the double damper 27e, and dust generated in the cooling mixer 27 is collected in the dust collecting duct 2
It is adapted to be collected by the bag filter 9 via 8. Further, the exhaust gas cooling device 7 has a water tank 29.
A cooling water circulating device 30 for circulating the cooling water therein is attached, a water tank 31 is attached to the purified soil recovery device 26, and the water therein is supplied and stored in a cooling mixer 27. The purified soil and the dust from the dust discharging mechanisms 22, 23, 24 are cooled and humidified in the water. A cyclone dust collector S is provided near the cooling mixer 27 in the dust collection duct 28 to effectively collect dust containing water vapor generated in the cooling mixer 27 in advance and to locate it on the downstream side. It is possible to reduce the burden on the bug filter 9 that is activated. The dust collected by the cyclone dust collector S can be dropped and collected on the conveyor 26a for collecting purified soil.

A cyclone of the dust collecting duct 28 is provided near the deodorizing furnace burner 17, the drying burner 18, and the auxiliary combustion burner 19 in the duct 16, near the deodorizing furnace 5 and the rotary kiln 2 in the heat retaining exterior duct 21, and in the dust collecting duct 28. Near the downstream side of the dust collector S, a wind control valve 32 that controls the amount of air blown to these devices is provided, and in the duct 11, a wind control valve 33 that controls the amount of exhausted air to the chimney 12. Is provided. Further, at the highest position of each of the duct 6 and the heat insulation exterior ducts 16 and 21, there is provided an automatic atmosphere blowing valve 34 for releasing abnormal pressure in the duct to the atmosphere.

Next, the main components of the apparatus 1 for treating contaminated soil will be described in detail with reference to FIGS. As shown in FIG. 2, the rotary kiln 2 has a cylindrical rotary drum 36 supported on a mount 35 whose one end side (the right end side in FIG. 2) is slightly inclined, and one end of the rotary drum 36. The rotary drum 3 and the manifold 37 that encloses the rotary drum 36 and allows relative rotation around the axis of the rotary drum 36.
A discharge chute (a material discharge part) that surrounds the other end (left end in FIG. 2) of 6 and allows relative rotation of the rotary drum 36 about its axis.
And 39. The rotary drum 36 includes a pair of rings 40a, 40b provided on the outer peripheral portion thereof apart from each other in the axial direction.
The lower part of the thrust roller is supported by two pairs of front and rear drum rollers 41a and 41b that are rotatably supported on a pedestal 35, and is rotated about an axis by a drive motor 42 fixed to the pedestal 35 via a chain transmission mechanism 43 to generate thrust roller. 44a, 44b
This prevents the movement in the axial direction.

On the inner wall surface of the rotary drum 36, a dry heating region a which is a region of a predetermined length extending from one end of the rotary drum 36 to a substantially central portion in the axial direction of the rotary drum 36 is polluted into the rotary drum 36. A flight 45 for scraping up and dropping the soil is provided, and the rotating drum 36 is provided from the end of the drying and heating area a.
A refractory lining 46 is applied to the heating / combustion area b which is the remaining area reaching the other end. Flight 45
Is a gutter-shaped member having a base end fixed to the inner wall surface of the rotary drum 36 and a free end protruding toward the center of the rotary drum and having a predetermined length in the axial direction. A plurality of them are provided at predetermined intervals. A flight 45 of the rotating drums 36 that are adjacent to each other in the axial direction.
Are circumferentially offset in phase from each other. The flight 45 is not limited to a gutter-shaped member, but may be a cup-shaped member, a belt-shaped member (flat bar-shaped member), a chevron-shaped member, a groove-shaped member, or the like.
Further, in each flight 45, unevenness 45b composed of triangular peaks and valleys is formed on the edge 45a on the free end side along the axial direction of the rotary drum 36, and the lining 46 of the refractory material is formed. Has many irregularities formed in the axial direction and the circumferential direction of the rotary drum 36. The unevenness is not limited to a triangle and may have another shape.

On the one end side of the rotary drum 36, the drying burner 18 having the tip side inserted into the rotary drum 36.
Is attached to the manifold 37, and a feeding screw 47c is appropriately rotated by a driving means in a cylindrical case 47b provided in communication with a lower portion of the feeding hopper 47a.
A material charging mechanism (material charging unit) 47 having the opening inserted therein is inserted into the rotary drum 36 through the manifold 37 at the open end of the case 47b, and is supported by the gantry 35 via the supporting member 48.

Further, the discharge chute 39 is provided with an auxiliary combustion burner 19 with its tip end facing the inside of the rotary drum 36, and an exhaust gas outlet 39a communicating with the refractory lining duct 4 is provided at the lower end. The cooling mixer 27 of the purified soil recovery apparatus 26 supported by the gantry 38 is connected to the outlet 39b of the portion. As shown in FIGS. 2 and 10, the cooling mixer 27 is supported on the pedestal 38 by inclining it so that the other end side (the left end side in FIG. 10) is higher than the one end side (the right end side in FIG. 10). The hermetically sealed mixer casing 27a, and a pair of mixing blades (biaxial mixing blades) provided inside the mixer casing 27a in parallel along a bottom portion inclined in the longitudinal direction of the mixer casing 27a (horizontal direction in FIG. 10). ) 27b, 27b (only one uniaxial mixing blade is shown in FIG. 10 overlapping in the direction perpendicular to the paper surface) and a biaxial mixing blade 27 supported by a mount 38.
and a motor (rotational drive device) 27c for rotating b and 27b in opposite directions via a chain transmission mechanism 27d.

The mixer casing 27a is detachably mounted on the casing main body 27a1.
7a2 is provided, and a material inlet 27f communicating with the discharge chute 39a of the rotary kiln 2 is provided at the upper part of one end side (right end side in FIG. 10) of the casing cover 27a2.
Exhaust outlet 2 that communicates with a dust collection duct 28 connected to the cyclone dust collector S on the other end side (the left end side in FIG. 10)
7 g are provided with material outlets 27 h, which communicate with the double damper 27 e, respectively, at the lower part on the other end side of the casing body 27 a 1.

The biaxial mixing blades 27b, 27b are also provided.
Is the diameter of a pair of parallel mixer shafts 27j, 27j (only one is shown in FIG. 10) rotatably supported by bearings 27i, 27i fixed to one end and the other end of the casing body 27a1. A plurality of paddle arms 27k are fixed in the axial and axial directions, and a paddle tip 27m is attached to the outer end of each paddle arm 27k. Further, in the paddle arms 27k, those adjacent to each other in the axial direction of the mixer shaft 27j have their phases shifted in the circumferential direction, and also between the pair of mixer shafts 27j, 27j, the biaxial mixing blades 27b, 27b. The phases of the paddle arms 27k and 27k are shifted so that the paddle chips 27m of both of them do not interfere with each other during rotation. The plate surface of each paddle tip 27m is inclined with respect to the axial direction of the mixer shaft 27j. Although not shown, the water tank 3 is provided on the other end side of the mixer casing 27a.
The water in 1 is introduced, and the water w is stored in the lower part on one end side of the mixer casing 27a.

As shown in FIGS. 3 to 7, the constant quantity supply device 3 includes a hopper 49 for introducing contaminated soil, and the hopper 4.
A hopper 49 provided in contact with a discharge port 49a at the bottom of
A feeder 50 for sending the contaminated soil inside to the outside, a guide hopper 51 provided at one end (the right end in FIG. 4) of the feeder 50 for dropping the contaminated soil, and a guide hopper for the contaminated soil sent out from the feeder 50. A swivel breaker 52 for scraping off inside 51 is provided and is supported by a pedestal 53.
The hopper 49 has a pedestal 53, which is formed in an inverted quadrangular pyramid shape with a wide upper material input port 49b and a narrow lower discharge port 49a.
The discharge port 49a is fixed to the material input port 4
9b is laterally (left and right in FIG. 5) decentered by a distance e, the left and right wall surfaces 49c, 49d have different inclination angles α, β, and the outlet side of the feeder 50 (FIG. 3, FIG. 3). 4 is formed so as to gradually widen toward the right side (see FIG. 3).

The feeder 50 is a belt feeder that moves along the longitudinal direction of the hopper 49 (left and right in FIGS. 3 and 4), and is a frame 53 fixed to the pedestal 53.
drive roller 50a and driven roller 50b provided at both ends of a
The belt 50c is wound around the drive roller 50a is rotated via the transmission mechanism 54a by the rotation of the feeder drive motor 54 on the small mount 52a fixed to the end of the frame 53a. In FIG. 4, 50d is a roller that supports the transfer side of the belt 50c from below. The feeder 50 may be another feeder instead of the belt feeder.

The swivel breaker 52 is the pedestal 52.
A breaker drive motor (driving device) 52b, which is configured by mounting a plurality of rod-shaped members 56 at a predetermined interval in the circumferential direction and the axial direction on a rotating shaft 55 rotatably supported by a Is rotated via the V-belt or chain transmission mechanism 52c.
The rod-shaped member 56, as shown in FIG.
Since the male screw portion 56a provided on the male screw portion 56a is diametrically inserted into the rotating shaft 55 and is attached to the rotating shaft 55 by a pair of nuts 57a and 57b screwed to the male screw portion 56a so as to sandwich the rotating shaft 55, the male screw portion 56a is attached. By adjusting the screwing positions of the nuts 57a and 57b with respect to the axial direction of the rod 56a, the protruding length of the tip end portion of the rod-shaped member 56 from the rotation shaft 55, that is, the belt 50 of the feeder 50 is adjusted.
It is possible to adjust the protruding length of c in the conveying surface direction. A belt conveyor 58 is provided at the lower discharge port 51a of the guide hopper 51 to receive the contaminated soil from the guide hopper 51 and to feed the soil into the hopper 47a of the feeding mechanism 47.

As shown in FIG. 8, the deodorizing furnace 5 has a furnace main body 60 which is formed in a vertical cylindrical shape and has an inner wall lined with a refractory material, and is installed via legs 5a, and the furnace main body 60. The dust discharge mechanism 22 provided so as to communicate with the funnel-shaped bottom portion 61 of the 60, and the deodorizing furnace burner 17 fixedly provided at a position slightly lower than the center of the furnace body 60 in the height direction.
A processing gas inlet 60a provided in the furnace body 60 in a tangential direction of the furnace body 60 at a position slightly lower than the position of the deodorizing furnace burner 17, and an exhaust gas formed in the upper portion of the furnace body 60. The second heat exchanger 14 and the first heat exchanger 13 arranged in series in communication with the port 60b, and a plurality of air introductions provided below the processing gas introduction port 60a and provided around the furnace body 60. And a hole 60c.

The first heat exchanger 13 is the first blower 1
5, the air inlet 13a and the heat insulation exterior duct 16
The second heat exchanger 14 has an air outlet 13b that communicates with the second heat exchanger 14, and the second heat exchanger 14 has an air inlet 14a that communicates with the second blower 20 and an air outlet 14b that communicates with the heat insulation exterior duct 21 of the deodorization furnace 5.
have. The processing gas inlet 60a is connected to the refractory lined duct 4 through which the exhaust gas from the rotary kiln 2 flows. The air introducing hole 60c is formed so as to be inclined so that the inside of the furnace body 60 faces upward, and the annular manifold 6 surrounds the air introducing hole 60c.
3 is attached to the furnace main body 60, and the heat insulation exterior duct 21 is installed in the air inlet 63a provided in the manifold 63.
And the temperature-raising air from the second heat exchanger 14 is introduced into the furnace body 60 from the air introduction hole 60c through the annular space 63b.

The dust discharging mechanism 22 comprises a case 62a connected to the outlet 61a of the bottom 61 of the furnace body 60 and a carrying screw 62b rotated by a driving means (not shown) inserted therein. The dust transferred by the transport screw 62b is cooled by a water cooling jacket provided around the. In addition, the deodorizing furnace burner 1
7 is attached to the furnace main body 60 in the tangential direction of the furnace main body 60 at the downstream side in the flow direction of the exhaust gas introduced into the furnace main body 60 from the processing gas introduction port 60a in the same manner as the processing gas introduction port 60a. Is preferred.

Further, as shown in FIG. 9, the exhaust gas cooling device 7 is a device body 6 which is formed in a vertical cylindrical shape closed by an upper end plate 65a and a lower end plate 65b and installed by a leg portion 7a.
5 and a lower end plate 65b connected to the lower part of the device main body 65.
Is connected to the upper part of the device main body 65, and the funnel-shaped bottom part 66 that forms a space 66a for turning back exhaust gas, the dust discharge mechanism 23 provided in communication with the outlet 66b of the bottom part 66, A flat cylindrical body 67a having an upper part closed and a lower part opened is divided into two parts by a partition plate 67b, and one part is separated from the upper end plate 65a by the exhaust gas introducing chamber 67.
The exhaust gas inlet / outlet box 67 formed by forming the exhaust gas outlet chamber 67d between the upper end plate 65a and the lower end plate 65b. A plurality of pipes 68 that connect the exhaust gas introducing chamber 67c and the exhaust gas turning-back space 66a and connect the turning-back space 66a and the exhaust gas outlet chamber 67d, and an upper end plate 65a and a lower end of the apparatus body 65. The cooling water circulating device 30 for supplying and circulating cooling water is provided in the internal space 69 between the plate 65b.

The exhaust gas inlet / outlet box 67 is provided with an inlet 67e which communicates with the duct 6 and introduces the exhaust gas from the combustion furnace 5 into the exhaust gas inlet chamber 67c.
An outlet 67f that communicates with the duct 8 that sends the exhaust gas from the exhaust gas outlet chamber 67d to the bag filter 9 is provided. Further, the partition plate 67b has an opening 67g.
Is provided, and the exhaust gas introduced into the exhaust gas introducing chamber 67c is controlled by opening and closing the opening 67g.
A slide valve 67h for bypassing to 7d is provided.

The cooling water circulation device 30 includes the water tank 29 whose bottom is connected to the upper portion of the internal space 69 by a pipe 70a connected to an inlet pipe 69a provided in the device body 65, and an outlet of the device body 65. A suction port is connected to the lower portion of the internal space 69 by a pipe 70b connected to the pipe 69b, and a circulation pump 71 whose discharge port is connected to the upper portion of the water tank 29 and cooling water connected to the upper portion of the water tank 29. The pipe 73 is provided with an electromagnetic valve 72 for supplying water to the water tank 29, a level switch 74 for detecting the amount of cooling water in the water tank 29, and a steam vent duct 75. The dust discharging mechanism 23 has the same structure as the dust discharging mechanism 22 of the deodorizing furnace 5.

Next, the operation of the contaminated soil treatment apparatus 1 according to the above embodiment will be described. In the case of purifying the contaminated soil M, first, the first blower 15 is operated to operate the deodorizing furnace burner 1 of the deodorizing furnace 5 via the heat insulation exterior duct 16.
7. Air is sent to each of the drying burner 18 and the auxiliary combustion burner 19 of the rotary kiln 2 to burn them.
When the feeder drive motor 54 and the breaker drive motor 52b of the constant quantity supply device 3 are operated after the combustion operation of 7, 18, 19 is performed, the contaminated soil M put into the hopper 49 is fed out of the hopper 49 by the feeder 50. At the same time, the contaminated soil is crushed by the turning breaker 52 and dropped onto the belt conveyor 58 through the guide hopper 51.

At that time, the discharge port 49a of the hopper 49
Is eccentric in the lateral direction with respect to the material input port 49b, and is formed so as to gradually widen toward the outlet side of the feeder 50, so that the contaminated soil charged into the hopper 49 is No cross-linking occurs at the lower part, and the contaminated soil does not laterally protrude from the gap between the feeder 50 and the lower part of the hopper 49 due to the internal pressure and spills from the feeder 50. It will be dropped on 58.

When the tip of the rod-shaped member 56 of the turning breaker 52 is worn due to the above-mentioned operation for a long period of time, the rotary shaft 55 of the rod-shaped member 56 is changed according to the amount of wear.
Projection length from the tip of the rod-shaped member 56 and the feeder 5
By changing the screwing position of the nuts 57a and 57b with respect to the male screw portion 56a, the distance (0) from the belt 50c) can be easily adjusted to a constant value and replaced as necessary. Further, by providing a rubber plate 51b (see FIG. 4) on the inner wall surface of the guide hopper 51 on the side facing the feeder 50, it is possible to prevent the contaminated soil blown by the turning breaker 52 from adhering to the guide hopper 51. You can The contaminated soil that has dropped onto the belt conveyor 58 is the material feeding mechanism 47.
Is charged into the rotary hopper 47a of the rotary kiln 2 and is reliably fed into the rotary drum 36 of the rotary kiln 2 at a constant feed amount.

The contaminated soil fed into the rotary drum 36 is repeatedly lifted and dropped by the flight 45 as the rotary drum 36 is rotated by the drive motor 42, and the discharge chute 39 from the manifold 37 side at one end to the other end. While moving toward the side, the combustion heat from the drying burner 18 and the heated air heated by the second blower 20 through the second heat exchanger 14 and introduced into the rotary drum 36 are contacted in parallel. And is efficiently dried and heated,
In the heating combustion region b on the downstream side of the rotary drum 36, the combustion heat of the auxiliary combustion burner 19 further heats it to a high temperature. As a result, the contaminated soil is purified by separating the oil from the soil by completely vaporizing the oil in the soil.
It is dropped from the discharge chute 39 into the water surface stored in the cooling mixer 27 of the purified soil recovery device 26,
Generation of dust is minimized and the biaxial mixing blade 27 of the cooling mixer 27 driven by the motor 27c.
By b and 27b, while being sent from one end side to the other end side, it is mixed with water to be cooled and humidified.

The flight 45 of the rotary drum 36
Since unevenness 45b is formed on the free edge of the
When the contaminated soil is picked up and dropped, the contaminated soil scraped upward by the flight 45 appropriately falls from the concave and convex portions of the flight 45, so that the falling film of the contaminated soil falls within the cross section of the rotating drum 36. By being spread, the heat of combustion of the burners 18 and 19 and the contaminated soil are favorably exchanged, and the contaminated soil is dried and heated efficiently. On the refractory material of the rotary kiln 2,
Due to the unevenness, the phenomenon that the contaminated soil slips with the rotation of the rotary kiln 2 does not occur, premature wear of the refractory material can be prevented, and some scraping / falling action occurs, and the contaminated soil is efficiently replaced, resulting in contamination. It is possible to favorably heat and burn the oil in the soil.

Although the heating and burning area b of the rotary drum 36 becomes hotter (300 to 750 ° C.) than the dry heating area a, the inner wall surface of the rotating drum 36 in the heating and burning area b is lined with a refractory material 46. Since the rotary drum 36 is provided, the rotary drum 36 is not deformed or damaged and durability is maintained. Since the inner surface of the inner lining 46 has many irregularities, when the rotary drum 36 rotates,
The phenomenon that contaminated soil slips on the inner surface does not occur, and the inner lining 4
6 does not wear early.

On the other hand, the exhaust gas containing the oil component separated and vaporized from the oil-contaminated soil in the rotary drum 36 is discharged from the exhaust gas outlet 39a of the discharge chute 39 through the refractory lined duct 4 into the processing gas introduction port 60a of the deodorizing furnace 5. And is introduced into the deodorizing furnace 5 as a swirling flow along the inner peripheral wall of the deodorizing furnace 5, where the dust in the exhaust gas is efficiently separated from the exhaust gas by the centrifugal dust collection action and falls to the bottom portion 61. . The exhaust gas from which the dust has been separated is sent out from the second blower 20 and heated to 400 ° C. or higher in the second heat exchanger 14, and then enters the annular space 63b of the manifold 63 via the heat insulation exterior duct 21 to introduce the air introduction hole. While being heated by the air blown into the furnace body 60 from 60c, it is heated by the heat of combustion of the deodorizing furnace burner 17 to raise the temperature, and the vaporized oil content in the exhaust gas is completely combusted.

In this case, in the deodorizing furnace burner 17, the combustion air is sent out from the first blower 15 and the first heat exchanger 1
In addition to being heated at 3, the air introduction hole 60
Due to the action of promoting the combustion of exhaust gas by introducing the heated air from c into the furnace body 60, the combustion efficiency is improved and the fuel consumption is reduced. The exhaust gas generated in the furnace body 60 passes through the exhaust port 60b, the second and first heat exchangers 14 and 13, and the air sent from the second and first blowers 20 and 15 to the heat insulation exterior ducts 21 and 16 is discharged. It is heated and sent to the exhaust gas cooling device 7 via the duct 6.

The exhaust gas sent to the exhaust gas cooling device 7 is supplied from the inlet 67e of the exhaust gas inlet / outlet box 67 to the exhaust gas introducing chamber 6
7c, and the bottom part 66 which flowed downward by the pipe 68
It turns over in the folding space 66a, flows upward, and enters the upper exhaust gas outlet chamber 67d. During this period, the exhaust gas is supplied to the pipe 70a, by the circulation pump 71 of the cooling water circulation device 30.
Internal space 6 of water tank 29 and furnace body 60 via 70b
It is cooled with the cooling water circulated between 9 and 9. in this case,
Since the exhaust gas is dispersed and flows in the plurality of pipes 68, the surface area in contact with the cooling water in the internal space 69 is increased and the exhaust gas is efficiently cooled.

The cooling capacity of the exhaust gas cooling device 7 is designed so that the exhaust gas is below the heat resistant temperature of the filter cloth of the bag filter 9 in the summer and the combustion temperature of the deodorizing furnace 5 is about 850 ° C. Therefore, in the winter or when the combustion temperature of the deodorizing furnace 5 is low, the temperature of the exhaust gas outlet chamber 67d becomes too low, and water in the exhaust gas may condense on the bag filter 9 and its downstream, but in this case, , The bypass valve 6
By changing the opening of the opening 67g of the partition plate 67b in 7h,
By adjusting the amount of exhaust gas bypassed from the exhaust gas introduction chamber 67c to the exhaust gas outlet chamber 67d, the temperature of the exhaust gas sent to the bag filter 9 side can be adjusted to a temperature at which no condensation occurs. Further, since the exhaust gas is rapidly inverted from the descending to the ascending in the folding space 66a of the bottom portion 66, the dust in the exhaust gas is efficiently separated and falls.

Exhaust gas outlet chamber 67 of the exhaust gas cooling device 7
The exhaust gas entering d is sent from the outlet 67f through the duct 8 to the bag filter 9, where dust is trapped and drops to the bottom, and only the cleaned exhaust gas is sucked through the duct 11 by the exhaust fan 10 and the chimney. 12 is released to the atmosphere. As described above, the exhaust gas sent to the bag filter 9 is cooled by the exhaust gas cooling device 7 and its temperature is sufficiently lowered. Therefore, the bag filter 9 does not have its filter cloth overheated and damaged. The dust filtration function can be normally maintained for a long period of time. The dust that has fallen to the bottoms 61 and 66 of the deodorizing furnace 5 and the exhaust gas cooling device 7 and the bottom of the bag filter 9 are respectively discharged to the dust discharge mechanisms 22 and 23.
24 taken out by the dust screw conveyor 25
Cooling mixer 27 of purified soil recovery device 26 via
And collected with the purified soil taken out from the discharge chute 39 of the rotating drum 36.
Disposal of dust becomes easy.

Further, in the contaminated soil treatment apparatus 1 according to the above-described embodiment, the rotary kiln 2 is provided on the inner wall surface of the rotary drum 36 with a region a of a predetermined length in the axial direction from the end on the manifold 37 side. A plurality of flights 45 are provided at intervals in the circumferential direction of the rotary drum 36 for scraping up and dropping the contaminated soil over the remaining area b from the area where the flights 45 are provided to the other end on the discharge chute 39 side.
A refractory lining 46 is provided over the entire length, a drying burner 18 is provided on one end side (the input hopper 47a side) of the rotating drum 36, and an auxiliary combustion burner 19 is provided on the discharge chute 39 side. Therefore, the contaminated soil put into the rotary drum 36 is dried and heated by the drying burner 18 in a cocurrent manner to be rapidly heated and its stickiness is lowered, so that the soil is highly water-containing soil or clay soil. Even if there is, it does not adhere to the flight 45, the rotating drum 36 and the inner wall surface thereof, and the heat exchange with the combustion heat of the drying burner 18 is favorably carried out, and it is quickly dried and heated and transferred to the discharge chute 39 side. Then, it is heated by the auxiliary combustion burner 19 and becomes high temperature.

As a result, the oil content in the contaminated soil can be easily and surely vaporized and separated from the contaminated soil even when heavy oil is contained, so that the contaminated soil can be purified. In addition to being excellently performed, the deodorizing furnace 5 can completely burn the vaporized oil content in the exhaust gas discharged from the rotary drum 36 of the rotary kiln 2. In addition, the heat of the exhaust gas from the deodorizing furnace 5 causes the first,
The air heated by the second heat exchangers 13 and 14 and raised in temperature is supplied to the drying burner 18, the auxiliary combustion burner 19, and one end side of the rotary drum 36 (the input hopper 47a side). The combustion efficiency of the burners 18 and 19 can be improved to reduce fuel consumption, and the contaminated soil put in the rotary drum 36 can be effectively dried and heated.

In the treatment apparatus 1 for contaminated soil according to the above-mentioned embodiment, the first and second heat exchangers 13 and 1 are used.
Since 4 is provided on the upper part of the deodorizing furnace 5 and directly connected to the exhaust port 60b thereof, a dedicated installation space is not required and heat can be efficiently recovered from the exhaust gas of the deodorizing furnace 5.
The duct 6 and the heat insulation exterior ducts 16 and 21 are also easy and preferable, but the locations of the first and second heat exchangers 13 and 14 are not limited to the above, and may be in the middle of the duct 6. Further, the air supplied to the deodorizing furnace burner 17, the drying burner 18, the auxiliary combustion burner 19, the inside of the deodorizing furnace 5, and the rotary drum 36.
The air to be supplied into the first and second heat exchangers 13 and 14
However, the present invention is not limited to this, and heating may be performed by one or three or more heat exchangers.

[0053]

As described above, the present invention has the following excellent effects. According to the apparatus for treating contaminated soil according to claim 1, the contaminated soil charged in the rotary kiln is dried and heated by the drying burner in a cocurrent manner to rapidly raise the temperature, and its stickiness is reduced. Even in high-moisture content soil or clay soil, it does not adhere to the flight or the inner wall of the rotary kiln, and heat is exchanged well with the combustion heat of the drying burner for rapid drying and heating. Is heated to a high temperature by being heated by an auxiliary burner there. As a result, the oil in the contaminated soil can be easily and surely vaporized and separated from the contaminated soil even if the heavy oil is contained, so that the contaminated soil can be purified extremely well and the combustion furnace Can completely burn the vaporized oil in the exhaust gas discharged from the rotary kiln.

In the contaminated soil treatment apparatus according to the second aspect, the combustion air heated by the heat of the exhaust gas from the combustion furnace and heated to improve the combustion efficiency of the combustion furnace burner and the auxiliary combustion burner. , It is possible to reduce the fuel consumption.

According to the contaminated soil treatment apparatus of the third aspect, the contaminated soil in which the air heated by the heat of the exhaust gas from the combustion furnace and heated is put into the rotary kiln is dried,
It effectively acts on heating and can reduce the fuel consumption of the drying burner, and at the same time, the vaporized oil supplied along with the exhaust gas from the rotary kiln is heated by the temperature-raising air to be burned by the combustion furnace burner. Complete combustion can be promoted and fuel consumption of the combustion furnace burner can be reduced.

According to the contaminated soil treatment apparatus of the fourth aspect, the contaminated soil scraped upward by the flight of the rotary kiln appropriately drops from the concave and convex portions of the flight, so that the falling film of the contaminated soil has a rotary kiln. Since it is formed so as to spread inside, the heat of combustion between the burner and the contaminated soil is favorably exchanged, and the contaminated soil can be dried and heated efficiently. Moreover, on the refractory material of the rotary kiln, the phenomenon that the contaminated soil slips due to the rotation of the rotary kiln due to the unevenness does not occur, it is possible to prevent early wear of the refractory material, and the contaminated soil is efficiently replaced by the contaminated soil. It is possible to heat and burn the oil well.

According to the contaminated soil treatment apparatus of the fifth aspect, when the exhaust gas from the rotary kiln flows into the combustion furnace, a swirling flow is generated along the furnace body, so that the centrifugal dust collection action causes The dust can be efficiently separated from the exhaust gas and can be reliably recovered by the dust discharge mechanism, and the vaporized oil content in the exhaust gas that has not been burned in the rotary kiln can be completely burned.

According to the sixth aspect of the present invention, the contaminated soil in the hopper is fed to the rotary kiln through the guide hopper by the operation of the feeder and the turning breaker of the material supply device, and the fixed feed amount is reliably ensured. You can send it out at.

According to the contaminated soil treatment apparatus of the seventh aspect, it is possible to prevent the contaminated soil from bridging in the lower part of the hopper of the material supply device, and to contaminate the gap between the feeder and the lower part of the hopper. It is possible to prevent soil from spilling out and spilling, and to accurately and stably supply the contaminated soil in a fixed amount to the rotary kiln.

According to the contaminated soil treatment apparatus of the eighth aspect, even if the rod-shaped member of the swivel breaker of the material supply device is worn, the length of the rod-shaped member protruding from the rotating shaft of the rod-shaped member is
It can be easily adjusted according to the wear amount, and the contaminated soil can be crushed and dispersed, and the fixed amount can be reliably sent to the rotary kiln.

According to the contaminated soil treatment apparatus of the ninth aspect, the high temperature exhaust gas from the combustion furnace can be easily cooled to lower the temperature, and a part of the dust in the exhaust gas is recovered and removed. Therefore, the burden on the dust collector installed downstream can be reduced, and the dust filtering function of the dust collector can be normally maintained for a long period of time.

According to the contaminated soil treatment apparatus of the tenth aspect, the exhaust gas flowing in the plurality of pipes of the exhaust gas cooling device has a large contact area with the cooling water flowing outside the pipes to exchange heat with the cooling water. Therefore, it is possible to quickly cool to a predetermined temperature, and when the flow direction of the exhaust gas changes in the folding space, it is possible to easily separate and collect dust in the exhaust gas. it can.

According to the contaminated soil treatment apparatus of the eleventh aspect, the dust contained in the exhaust gas flowing from the rotary kiln to the chimney can be collected and collected in the purified soil, and the dust can be easily treated. .

According to the apparatus for treating contaminated soil according to the twelfth aspect, the purified soil discharged from the discharge chute of the rotary kiln is efficiently mixed with the water stored in the cooling mixer by the mixing blade, It can be humidified, and the generation of dust from the purified soil can be minimized.

According to the contaminated soil treatment apparatus of the thirteenth aspect, dust containing water vapor generated in the cooling mixer is effectively collected in advance to reduce the load on the bag filter located on the downstream side thereof. be able to.

[Brief description of drawings]

FIG. 1 is a system diagram showing an embodiment of a treatment apparatus for contaminated soil according to the present invention.

FIG. 2 is a side view showing a partial cross section of an example of a rotary kiln in one embodiment of the apparatus for treating contaminated soil according to the present invention.

FIG. 3 is a plan view showing an example of a fixed quantity supply device in an embodiment of the apparatus for treating contaminated soil according to the present invention.

FIG. 4 is a side view of the same.

FIG. 5 is a front view of the same.

6 is a view on arrow A in FIG. 4. FIG.

7 is a detailed view of an X part of FIG.

FIG. 8 is a side view showing a partial cross section of an example of the deodorizing furnace in the embodiment of the apparatus for treating contaminated soil according to the present invention.

FIG. 9 is a side view showing a partial cross section of an example of the exhaust gas cooling device in the embodiment of the treatment apparatus for contaminated soil according to the present invention.

FIG. 10 is a vertical cross-sectional view showing an example of a cooling mixer in one embodiment of the apparatus for treating contaminated soil according to the present invention.

FIG. 11 is a system diagram showing an example of a conventional treatment apparatus for contaminated soil.

[Explanation of symbols]

1 Contaminated soil treatment equipment 2 Rotary kiln 3 Quantitative supply device (material supply device) 4 Refractory lined duct 5 Deodorization furnace (combustion furnace) 6,8,11 duct 7 Exhaust gas cooling device 9 Bag filter (dust collector) 10 blower 12 chimney 13, 14 First and second heat exchangers (heat exchangers) 16,21 Heat insulation exterior duct 17 Deodorizing furnace burner (combustion furnace burner) 18 Drying burner 19 Burner for auxiliary combustion 22, 23, 24 Dust discharge mechanism 25 Dust screw conveyor 26 Purified soil recovery equipment 27 Cooling mixer 28 Dust collection duct 29,31 Water tank 30 Cooling water circulation device 37 manifold 39 discharge chute 45 flights 46 Refractory lining 47 Material input mechanism 47a Input hopper 52 swivel breaker 56 Bar-shaped member S cyclone dust collector

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F23G 5/46 F23M 5/00 H 4D004 7/14 F26B 21/00 J 4K056 F23J 15/06 K 4K061 F23M 5 / 00 25/04 F26B 21/00 F27B 7/14 7/20 25/04 7/32 F27B 7/14 7/33 7/20 7/34 7/32 7/36 7/33 7/38 7/34 F27D 17/00 101D 7/36 104D 7/38 105A F27D 17/00 101 F23B 1/32 301 104 F23H 9/02 105 B09B 3/00 303P // F23B 1/32 301 ZAB F23H 9/02 F23J 15/00 K (72) Inventor Masahiko Nasu 1-19-11 Kyobashi, Chuo-ku, Tokyo Japan Tamaido Co., Ltd. (72) Tomohiro Gomachi 1-19-11 Kyobashi, Chuo-ku, Tokyo Japan Tamaido Co., Ltd. (72) Inventor Haruyuki Hirano 1-9-3 Kamatahonmachi, Ota-ku, Tokyo F-Term (Reference) 3K046 AA00 AB03 AD08 AD09 BA01 CA03 CA05 EA03 3K061 GA05 KA03 KA06, Niigata Iron Works Engineering Center Co., Ltd. KA15 KA16 KA21 KA28 3K065 AA07 AA16 AB01 AC06 BA05 JA05 JA15 3K070 DA09 DA29 DA35 3L113 AA06 AB03 AC04 AC36 AC45 AC46 AC54 AC58 AC63 AC68 AC86 AC87 BA37 DA01 DA03 DA05 DA10 DA24 CB42 DA14 CB43 CA12 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA42 CA 42 CA 42 CA 42 CA 42 CA 42 CA 42 CA 42 CA 42 CA 42 CA 0 BA06 BB01 BC01 BC06 CA20 DA02 DA22 DA26 DA32 DB13 4K061 AA08 BA03 DA01 DA07 EA03 FA05 HA05

Claims (13)

[Claims] 1. An oil-contaminated soil is introduced by a material supply device from a charging hopper provided at one end of a rotary kiln that rotates around an axis, and is dried and heated by the combustion heat of a drying burner to remove oil in the contaminated soil. The soil, which has been evaporated and the oil is evaporated and purified, is taken out from an exhaust chute provided at the other end of the rotary kiln, and the exhaust gas containing the evaporated oil is sent to a combustion furnace to be burned in a combustion furnace burner. After heating the air supplied to the drying burner with the heat of the exhaust gas through the exhaust gas generated in the heat exchanger,
In the apparatus for treating oil-contaminated soil, which is configured to be discharged from a chimney through a dust collector, the rotary kiln scrapes and pollutes the contaminated soil from one end on the input hopper side over a region of a predetermined axial length on its inner wall surface. A plurality of flights are provided at intervals in the circumferential direction of the rotary kiln, and a refractory lining is provided over the remaining area from the area where the flights are provided to the other end on the discharge chute side, and An apparatus for treating oil-contaminated soil, characterized in that a drying burner is provided on the hopper side and an auxiliary combustion burner is provided on the discharge chute side. 2. The combustion furnace burner and the auxiliary combustion burner,
The contaminated soil treatment apparatus according to claim 1, wherein air heated by heat of exhaust gas from the combustion furnace is supplied to the heat exchanger. 3. The air heated by the heat of the exhaust gas from the combustion furnace in the heat exchanger is supplied to the inside of one end of the rotary kiln and the inside of the lower part of the combustion furnace as combustion air for oil. The contaminated soil treatment device according to claim 1 or 2. 4. The rotary kiln has a plurality of irregularities formed on a free end edge thereof along an axial direction of the flight, and a large number of irregularities formed on an inner surface of a refractory lining. The treatment apparatus for contaminated soil according to any one of claims 1 to 3. 5. The furnace includes a furnace body formed in a vertical cylindrical shape and having an inner wall lined with a refractory material, a dust discharge mechanism provided at a funnel-shaped bottom of the furnace body, and the furnace body. The combustion furnace burner provided, a process gas inlet for introducing the exhaust gas from the rotary kiln provided in the furnace body into the furnace body to enable centrifugal dust collection, and an exhaust port at the top of the furnace body. The said heat exchanger provided is provided, The treatment apparatus of the contaminated soil in any one of Claims 1-4 characterized by the above-mentioned. 6. The material supply device comprises: a hopper for introducing contaminated soil, a feeder provided at an opening on the bottom of the hopper for feeding contaminated soil to the outside, and a contamination provided at one end of the feeder. The treatment of contaminated soil according to any one of claims 1 to 5, further comprising: a guide hopper for dropping the soil, and a swivel breaker for scraping off the contaminated soil sent from the feeder into the guide hopper. apparatus. 7. The hopper is formed in an inverted quadrangular pyramid shape with a wide upper material inlet and a narrow lower outlet, and the outlet is laterally eccentric to the material inlet. The treatment device for contaminated soil according to claim 6, wherein the treatment device is formed so as to gradually widen toward the outlet side of the feeder. 8. The swivel breaker is provided with a plurality of rod-shaped members at predetermined intervals in a circumferential direction and an axial direction of a rotary shaft rotated by a drive device, and the rod-shaped member extends from the rotary shaft toward the outer peripheral direction. 7. The apparatus for treating contaminated soil according to claim 6, wherein the protruding length of the soil is adjustable. 9. An exhaust gas cooling device having a dust discharge mechanism at a lower end portion for cooling exhaust gas from the combustion furnace is provided between the combustion furnace and the dust collector. The treatment apparatus for contaminated soil according to any one of to 8. 10. The exhaust gas cooling device includes a vertical tubular device body closed by an upper end plate and a lower end plate, and an exhaust gas return space between a lower end plate connected to the lower part of the device body. A funnel-shaped bottom part that forms a bottom part, the dust discharge mechanism provided in communication with the bottom part, and the upper part of the main body of the apparatus, which is closed, and the bottom part is opened. And one of the compartments forms an exhaust gas introducing chamber into which the exhaust gas from the combustion furnace is introduced between the upper end plate and the other end, and the other compartment forms the exhaust gas into the dust collector between the upper end plate and the upper end plate. An exhaust gas inlet / outlet box that forms an exhaust gas outlet chamber to be sent out, is provided so as to span the upper end plate and the lower end plate, and connects the exhaust gas introduction chamber and the return space of the exhaust gas, the return space and the Multiple to communicate with exhaust gas outlet chamber 10. The contaminated soil according to claim 9, further comprising: a pipe, and a cooling water circulation device that supplies and circulates cooling water in an internal space between an upper end plate and a lower end plate of the device body. Processing equipment. 11. At least one of a dust discharging mechanism of the combustion furnace, a dust discharging mechanism of the exhaust gas cooling device, and a dust discharging mechanism provided at a lower portion of the dust collector is connected to a portion for taking out purified soil from the rotary kiln. The treatment apparatus for contaminated soil according to claim 9 or 10, characterized in that. 12. A cooling mixer provided with a mixing blade rotated by a rotary drive device is provided inside a mixer casing capable of storing water at a lower portion on one end side of an inclined bottom, and one end side of the cooling mixer. The material inlet provided at the top of the is connected to the discharge chute of the rotary kiln,
A material for taking out the purified soil sent from one end to the other end by the mixing blade at the lower end of the other end while the exhaust outlet provided at the upper end of the other end is connected to the dust collector through the dust collecting duct. An outlet is provided.
11. The treatment apparatus for contaminated soil according to any one of 11. 13. The treatment apparatus for contaminated soil according to claim 12, wherein a cyclone dust collector is provided in the dust collection duct.