JP4100614B2 - Contaminated soil treatment equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for purifying soil contaminated with heavy oil. More specifically, the present invention relates to a contaminated soil treatment apparatus capable of treating soil contaminated with heavy oil at a low temperature.
[0002]
[Prior art]
Conventionally, an apparatus for purifying soil contaminated with oil has volatilized and separated and decomposed volatile components having a low boiling point from soil contaminated with light oil such as kerosene and light oil by a drying drum.
[0003]
However, the oil quality of the contaminated soil is not limited to light oil, but the soil of the oil industry facility is contaminated with heavy oil such as crude oil and heavy oil, and the soil of various industrial plants is light. It is a complex contaminated soil that is contaminated with heavy oil as well as oil.
[0004]
When the soil contaminated with such heavy oil is purified by heat treatment, heating at a high temperature is not preferable because an oil film or oily odor is generated from the contaminated soil, causing a risk of living environment. Therefore, it is preferable to heat the contaminated soil at a low temperature.
[0005]
However, as described in, for example, JP-A-2002-263633, when soil contaminated with heavy oil is subjected to low-temperature heat treatment, heavy volatile components adhere to the inner wall of the drying drum that performs the heat treatment. . Then, there is a problem that the attached volatile component (oil component) is cured to provide a heat insulating effect, and it is difficult to perform an efficient low-temperature heat treatment using a drying drum.
[0006]
In addition, heavy volatile components at the time of low-temperature heat treatment of soil contaminated with heavy oil cause a problem that the bag filter is clogged. When the bug filter is clogged, there is a problem that the filter function is reduced and normal operation cannot be performed.
[0007]
[Problems to be solved by the invention]
The present invention has been proposed in view of the problems of the prior art as described above, and is a contaminated soil treatment apparatus capable of preventing heavy volatile components from adhering to the inner wall of a drying drum and curing. The purpose is to provide.
Another object of the present invention is to provide a contaminated soil treatment apparatus in which heavy volatile components can prevent clogging of a bag filter.
[0008]
According to the present invention, in a contaminated soil treatment apparatus capable of treating soil contaminated with heavy oil, the contaminated soil is heated on the drying drum (20) and attached to the inner wall of the drying drum (20). The solid material supply mechanism (10) for supplying the solid material (5) for removing heavy oil volatile components to the drying drum (20), and the exhaust gas (G) from the drying drum (20) are supplied. Bag filter (34), a powder supply mechanism for supplying powder to which the heavy oil component in the exhaust gas passing through the bag filter (34) is attached to the bag filter (34), and a drying drum (20) ), And a storage silo (44) into which the purified soil (7) cooled by the cooling drum (40) is fed. Silo (44) is funnel at the bottom A predetermined amount of the purified soil (7) and the solid matter (5) cooled from the funnel portion is supplied to the vibrating sieve (50) via the belt conveyor (48) in a batch system. A separate conveyor (11) for recycling the solid matter (5) left on the net shelf by the vibrating sieve (50) in the drying drum (20) is provided.
[0010]
According to the present invention having such a configuration, the solid matter plays a role like a ball in a ball mill for pulverizing a sample, and a contaminant component such as a solidified product of a heavy oil volatile component adhering to the drying drum is present. Since it acts to scrape off, scrape off, and peel off before solidifying, even if heavy volatile components adhere to the inner wall of the drying drum, they are removed by the solid matter at a stage before it hardens.
[0011]
In other words, the solid material has an action of tapping, rubbing off, and stripping off before the contaminant component (such as the solidified product of heavy oil volatile component) adhering to the drying drum is solidified. And what is necessary is just a thing which does not damage the said drying drum.
If the specific gravity of the solid matter is too small, it is difficult to remove such contaminant components before solidifying. On the other hand, if the specific gravity of the solid matter is too large, the drum may be damaged when supplied to the drying drum, which is inconvenient.
[0012]
Moreover, even if the surface of the solid is too smooth, it is inappropriate for removing contaminants. In addition, in order to prevent damage to not only the drying drum but also a hopper for supplying to the drum and various devices connected to the drum, for example, an elevator, the size of the solid matter is preferably 100 mm or less at the maximum.
[0013]
Furthermore, the solid matter should be free from problems even when mixed with the treated soil. That is, it is necessary to have no problem as a recycled material from the environmental aspect.
[0014]
In order not to adversely affect the environment as industrial waste, it is preferable that the solid matter can be sorted by a sorting means such as a sieve.
Since the soil after the purification treatment is moist, sorting means (for example, a vibrating sieve) that rotates or vibrates is preferable.
[0017]
According to the present invention having such a configuration, a duct that guides contaminants, which are volatile components of heavy oil, is communicated from the drying drum to the bag filter of the filter means having a filter made of fiber-based filter cloth, It is preferable that a powder supply mechanism for injecting and injecting powder adsorbing contaminants into the duct is provided. The powder supply mechanism is preferably composed of a powder input pipe communicating with the duct and a powder input tank communicating with the powder input pipe.
[0018]
The powder charging tank is installed in the vicinity of the bag filter of the filter means, and a certain amount of powder is sprayed into the duct to adhere to the filter cloth in the bag filter.
The heavy oil component in the drying gas sent from the drying drum adheres to and adsorbs to the powder when passing through the filter cloth, and is not easily attached directly to the filter cloth.
The heavy oil component adhering and adsorbing to the powder is periodically sieved and collected together with the powder together with dust.
[0019]
In addition, in the contaminated soil treatment apparatus of the present invention, a drying drum that heats the contaminated soil (contaminated with heavy oil) and a contaminant (such as a volatile component of heavy oil) are included. Filter means for purifying exhaust gas from the drying drum (for example, a bag filter) and (for removing contaminant components such as solidified heavy oil volatile components adhering to the inner wall of the drying drum) ) Solid material supply mechanism (for example, solid material input belt conveyor, soil / solid material input belt conveyor) for supplying solid matter to the drying drum, and powder supply mechanism for supplying powder for adsorbing contaminants to the filter means (Powder input tank, powder input pipe, etc.), and the filter means has a filter mainly composed of fibers, and the contaminant adsorbing powder passes through the fibers of the filter. Without doing Located on the fiber surface, preferably it has a property of adsorbing contaminants (volatile component heavy oil).
Alternatively, instead of the solid material supply mechanism, a solid material for removing contaminant components (such as a solidified product of a heavy oil volatile component adhering to the inner wall of the drying drum) may be mixed in the drum. good.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 shows a first embodiment of the present invention.
The contaminated soil treatment apparatus 1 of the present invention includes a drying drum 20, a solid material supply mechanism 10 that supplies a solid material to the drying drum 20, a bag filter 34 as a filter means, and a powder supply that supplies powder to the bag filter 34. The mechanism 30, the cooling drum 40, and the storage silo 44 are the main components.
[0021]
The solid material supply mechanism 10 includes a first belt conveyor 11 that conveys the solid material 5, a second belt conveyor 12, a hopper 14, and a fifth belt conveyor 16. The solid material 5 supplied by the solid material supply mechanism 10 should have a diameter size of 100 mm or less as a guideline of the weight for removing the solidified material due to the oil in the drying drum 20, and the outer shape has a certain degree of corners. Solid materials that do not damage the hopper, elevator, etc. when circulating in the soil treatment apparatus are good. Moreover, when it is used for landfill etc. with the purification | cleaning soil 7, the thing without the property which becomes environmental deterioration is preferable.
[0022]
The second belt conveyor 12 is configured so that the contaminated soil 3 accumulated at an appropriate place is mixed with the solid matter from the first belt conveyor 11 and conveyed to the hopper 14 for injection.
[0023]
The hopper 14 is configured to supply the contaminated soil 3 and the solid material 5 to the drying drum 20 in predetermined amounts.
[0024]
The third belt conveyor 16 is configured to supply a predetermined amount of contaminated soil 3 and solid matter 5 from the hopper 14 to the drying drum 20 in a batch manner.
[0025]
The drying drum 20 heats the contaminated soil 3 and the solid material 5 with a dry gas at a predetermined low temperature while the oily film and the oily odor are not generated while rotating and stirring the exhaust gas G containing evaporated heavy oil from the duct 24 through the bag filter. 34, the contaminated soil 3 and solid matter 5 that have been dried and deoiled are discharged from the discharge port 22.
[0026]
When the contaminated soil 3 is heated and dried in the drying drum 20, when the solid material 5 is dropped by the rotation of the drum 20, the oil adhering to the inner wall of the drum 20 is knocked down and scraped off. As a result, the heat exchange between the contaminated soil 3 and the dry gas is normally performed without deterioration of the function of the drying drum 20 so that the low temperature heat treatment of the contaminated soil 3 containing heavy oil can be performed. It is configured.
[0027]
An elevator 26 communicates with a cooling drum 40 through a charging port 28 at a discharge port 22 provided on the lower side opposite to the duct 24 of the drying drum 20.
[0028]
The cooling drum 40 is configured to cool the solid material 5 and the purified purified soil 7 supplied from the input unit 28 to a predetermined temperature and input the storage silo 44 installed adjacent thereto.
[0029]
The storage silo 44 is formed with a funnel portion 44 at the bottom, and a predetermined amount of the purified soil 7 and the solids 5 cooled from the funnel portion 44 is batch fed to the vibrating sieve 50 via the fourth belt conveyor 48. It is configured to supply. Note that the supply of the purified soil 7 and the solid material 5 to the vibrating sieve 50 may be a continuous supply method as long as the place for depositing the purified soil 7 is secured and the fifth belt conveyor 52 has a capacity.
[0030]
The vibrating sieve 50 loads the purified soil 7 on the transport vehicle 9 in the illustrated example so that the solid soil 5 is dropped on the net shelf by vibration and the purified soil 7 is dropped and sent to the fifth belt conveyor 52. And is configured to be carried out.
[0031]
The bag filter 34 has a known function and configuration for performing a filtration function with a filter cloth, and introduces an exhaust gas G containing a heavy oil component that is a pollutant from the duct 24 to filter the fiber as a main component. The cloth 36 separates the oil component and discharges harmless gas Gn from the exhaust device 38 to the outside.
[0032]
In the vicinity of the bag filter 34, a powder supply mechanism 30 that supplies fine powder Pw, which is an inorganic material, is provided.
[0033]
The powder supply mechanism 30 includes a powder input tank 31 for storing the powder Pw, a nozzle 33 for injecting and injecting the powder Pw into the duct 24, and a powder input pipe for communicating the nozzle 33 and the powder input tank 31. 32 and configured to supply a predetermined required amount of powder Pw to the bag filter 34 in accordance with the operation of the bag filter 34.
[0034]
The bag filter 34 attaches the powder Pw to the filter cloth 36, adsorbs the heavy oil component in the exhaust gas G to the powder Pw attached to the fiber of the filter cloth 36, and adsorbs the heavy oil component. The powder Pw is separated periodically or at any time by vibration or impact application and collected together with dust.
[0035]
The operation of the contaminated soil treatment apparatus having the above configuration will be described.
First, the contaminated soil 3 and the solid material 5 supplied from the first belt conveyor 11 are mixed and loaded on the hopper 14 by the second belt conveyor 12. The hopper 14 supplies the contaminated soil 3 and the solid material 5 to the drying drum 20 through the third belt conveyor 16 in a batch manner by a predetermined amount.
[0036]
In the drying drum 20, the heavy oil content in the contaminated soil 3 is converted to the purified soil 7 in which the exhaust gas G and the oil content are separated by low-temperature heating that does not generate an oil film / oil odor. In this process, the volatile components of the heated heavy oil adhere to the inner wall of the drying drum 20 and solidify if left as it is. Therefore, before the solidification, the solids 5 are struck down while rotating or falling with the drum rotation, Scrub off and remove to prevent solidification of heavy oil volatile components. As a result, heat exchange is normally performed between the contaminated soil 3 and the dry gas, and low-temperature heat treatment is possible.
[0037]
The purified soil 7 from which the oil content has been separated by 20 from the drying drum is introduced into the cooling drum 40 through the discharge port 22, the elevator 26 and the charging unit 28 together with the solid material 5, cooled to an appropriate temperature, and stored in the storage silo 44. It is thrown.
[0038]
A predetermined amount of the purified soil 7 and the solid material 5 is supplied from the funnel portion 44 of the storage silo 44 to the vibrating sieve 50 via the fourth belt conveyor 48 in a batch manner.
[0039]
In the vibration sieve 50, the purified soil 7 is dropped by leaving the solid matter 5 on the net shelf by vibration, loaded on the transport vehicle 9 and carried out, and the solid matter 5 is sent to the fifth belt conveyor 52.
The solid material 5 accumulated on the fifth belt conveyor 52 is sent to the first belt conveyor 11 as a recycled material and reused.
[0040]
On the other hand, the exhaust gas G containing the heavy oil component evaporated and separated from the contaminated soil 3 by the drying drum 20 is guided to the bag filter 34 through the duct 24.
At this time, the powder Pw in the powder charging tank 30 is injected and injected into the duct 24 from the nozzle 33 provided at the end of the duct 24 on the bag filter 34 side, and dispersed in the bag filter 34.
[0041]
The powder Pw dispersed in the bag filter 34 adheres to the filter cloth 36 and adsorbs the heavy oil component in the exhaust gas G that flows in thereafter together with the light oil component. Further, the harmless gas Gn in the exhaust gas G from which oil has been removed is discharged to the outside through the filter cloth 36 from the exhaust device 38.
[0042]
The powder Pw obtained by adsorbing the heavy oil component together with the light oil component is removed from the filter cloth 36 by vibration or impact and collected together with dust.
[0043]
In this way, the soil portion of the contaminated soil 3 is recovered as harmless purified soil 7, and the heavy oil component is discharged as harmless gas Gn. Further, the solid material 5 for guaranteeing the low-temperature heat treatment in the drying drum 20 circulates in the contaminated soil treatment apparatus 1 and is used infinitely.
[0044]
FIG. 2 shows a second embodiment of the present invention.
The contaminated soil treatment apparatus 2 of the present invention includes a drying drum 20 in which a solid material 5 is incorporated, a contaminated soil supply mechanism 10A that supplies the contaminated soil 3 to the drying drum 20, a bag filter 34 as a filter means, and a bag filter 34. The powder supply mechanism 30 for supplying powder, the cooling drum 40, and the storage silo 44 are the main components.
[0045]
The contaminated soil supply mechanism 10A includes a first belt conveyor 12A that conveys the contaminated soil 3, a hopper 14, and a second belt conveyor 16A. The solid material 5 incorporated in the drying drum 20 should have a diameter of 100 mm or less as a guideline of the weight for removing the solidified product due to the oil in the drying drum 20, and the outer shape has a certain degree of corners. Solids that do not damage the inner wall when circulating inside are good. Moreover, when it is used for land reclamation etc. with the purification soil 7 after completion of the construction, it is preferable that there is no property that deteriorates the environment.
[0046]
The first belt conveyor 12 </ b> A is configured to convey and feed the contaminated soil 3 accumulated at an appropriate place to the hopper 14.
[0047]
The hopper 14 is configured to supply the contaminated soil 3 to the second belt conveyor 16A by a predetermined amount.
[0048]
The second belt conveyor 16 </ b> A is configured to supply a predetermined amount of contaminated soil 3 from the hopper 14 to the drying drum 20.
[0049]
The drying drum 20 heats the contaminated soil 3 and the built-in solid matter 5 with a dry gas at a predetermined low temperature where oil film and oily odor are not generated while rotating and stirring, and the exhaust gas G containing evaporated heavy oil is duct 24. To the bag filter 34, and the dried contaminated soil 3 is discharged from the discharge port 22 through the net body 21 while leaving the solid matter 5.
[0050]
When the contaminated soil 3 is heated and dried in the drying drum 20, when the solid material 5 is dropped by the rotation of the drum 20, the oil adhering to the inner wall of the drum 20 is knocked down and scraped off. As a result, the heat exchange between the contaminated soil 3 and the dry gas is normally performed without deterioration of the function of the drying drum 20 so that the low temperature heat treatment of the contaminated soil 3 containing heavy oil can be performed. It is configured.
[0051]
An elevator 26 communicates with the cooling drum 40 through an inlet 28 of the cooling drum 40 at a discharge port 22 provided on the lower side opposite to the duct 24 of the drying drum 20.
[0052]
The cooling drum 40 is configured to cool the heated and purified purified soil 7 supplied from the input unit 28 to a predetermined temperature and input it to a storage silo 44 installed adjacent thereto.
[0053]
The storage silo 44 is formed with a funnel portion 44 at the bottom, and a predetermined amount of the purified soil 7 cooled from the funnel portion 44 is externally fed in a batch manner via the third belt conveyor 48A, and in the illustrated example, a transport vehicle. 9 is configured to be loaded and carried out.
[0054]
The bag filter 34 has a known function and configuration for performing a filtration function with a filter cloth, and introduces an exhaust gas G containing a heavy oil component that is a pollutant from the duct 24 to filter the fiber as a main component. The cloth 36 separates the oil component and discharges harmless gas Gn from the exhaust device 38 to the outside.
[0055]
In the vicinity of the bag filter 34, a powder supply mechanism 30 that supplies fine powder Pw, which is an inorganic material, is provided.
[0056]
The powder supply mechanism 30 includes a powder input tank 31 for storing the powder Pw, a nozzle 33 for injecting and injecting the powder Pw into the duct 24, and a powder input pipe for communicating the nozzle 33 and the powder input tank 31. 32 and configured to supply a predetermined required amount of powder Pw to the bag filter 34 in accordance with the operation of the bag filter 34.
[0057]
The bag filter 34 attaches the powder Pw to the fibers of the filter cloth 36, adsorbs the heavy oil component in the exhaust gas G to the powder Pw attached to the filter cloth 36, and adsorbs the heavy oil component. The powder Pw is separated by vibration or impact application and collected together with dust. Accordingly, the powder Pw adsorbing the heavy oil component can be removed periodically or as needed.
[0058]
The operation of the contaminated soil treatment apparatus having the above configuration will be described.
First, the contaminated soil 3 is put into the hopper 14 by the first belt conveyor 12A.
The hopper 14 supplies a predetermined amount of the contaminated soil 3 to the drying drum 20 by the third belt conveyor 16.
[0059]
In the drying drum 20, the heavy oil in the contaminated soil 3 is heated to a low temperature so that the exhaust gas G and the oil are separated into the purified soil 7 that does not generate an oil film / oil odor. In this process, the volatile components of the heated heavy oil adhere to the inner wall of the drying drum 20 and solidify if left as it is. Therefore, before the solidification, the solids 5 are struck down while rotating or falling with the drum rotation, Scrub off and remove to prevent solidification of heavy oil volatile components. As a result, heat exchange between the contaminated soil 3 and the dry gas is normally performed, and low-temperature heat treatment is possible.
[0060]
The purified soil 7 from which the oil content has been separated from the drying drum 20 passes through the mesh body 21 and enters the cooling drum 40 via the discharge port 22, the elevator 26 and the charging unit 28, and is cooled to an appropriate temperature, and is stored in a storage silo. 44.
[0061]
A predetermined amount of the purified soil 7 is loaded from the funnel portion 44 of the storage silo 44 onto the transport vehicle 9 via the third belt conveyor 48 </ b> A in a batch manner.
[0062]
On the other hand, the exhaust gas G containing the heavy oil component evaporated and separated from the contaminated soil 3 by the drying drum 20 is guided to the bag filter 34 through the duct 24.
At this time, the powder Pw in the powder charging tank 30 is injected and injected into the duct 24 from the nozzle 33 provided at the end of the duct 24 on the bag filter 34 side, and dispersed in the bag filter 34.
[0063]
The powder Pw dispersed in the bag filter 34 adheres to the filter cloth 36 and adsorbs the heavy oil component in the exhaust gas G that flows in thereafter together with the light oil component. Further, the harmless gas Gn in the exhaust gas G from which oil has been removed is discharged to the outside through the filter cloth 36 from the exhaust device 38.
[0064]
The powder Pw obtained by adsorbing the heavy oil component together with the light oil component is removed from the filter cloth 36 by vibration or impact and collected together with dust.
[0065]
In this way, the contaminated soil 3 is recovered as harmless purified soil 7 and the heavy oil component is discharged as harmless gas Gn. Further, the solid material 5 for ensuring the low temperature heat treatment in the drying drum 20 is repeatedly recycled.
[0066]
The illustrated embodiment described above is merely an example, and is not intended to limit the technical scope of the present invention.
For example, in the first embodiment of FIG. 1, the solid material 5 that removes heavy oil adhering to the inner wall of the drying drum 20 is supplied from the outside of the drying drum 20 and discharged from the drying drum 20 to treat contaminated soil. Although it is configured to circulate in the apparatus 1, if it is configured so that a predetermined amount remains in the drying drum 20 without circulating the entire amount of the solid material 5 for removing the heavy oil, the drying drum 20. It is possible to reduce the amount of heating heat of the drying drum 20 by the amount of heat accumulated in the solid material 5 remaining inside.
[0067]
【The invention's effect】
The effects of the present invention are listed below.
(A) According to the present invention, since the solid matter is supplied to the drying drum, the solid matter is prevented from falling or rotating in the drying drum to prevent the heavy oil from sticking to the inner wall of the drum, and the solidification of the heavy oil. It is possible to prevent the heat exchange between the contaminated soil and the dry gas from adhering to matter and to operate the drying drum normally.
(B) Equipped with a solid supply mechanism that supplies solids to the drying drum, so it is easy to supply and replace solids, and always supply a large amount of new solids to prevent solid oil from adhering to solid oil. it can.
(C) If solid matter is mixed in the drying drum, heavy oil can be prevented from adhering to the inner wall of the drying drum and solidifying.
(D) Since powder for adsorbing contaminants is supplied from the powder supply mechanism to the filter means for purifying the exhaust gas from the drying drum, the powder adsorbs contaminants in the exhaust gas and harmless exhaust. Gas can be separated.
(E) Since the filter means includes a filter composed mainly of fibers, the pollutant-adsorbing powder easily adheres to the fiber surface, and the pollutant can be efficiently adsorbed by the powder.
(F) Since the contaminants adhere to the powder on the fiber surface, the deposits can be easily removed from the filter by applying vibration or impact periodically or at any time.
[Brief description of the drawings]
FIG. 1 is a block configuration diagram of a first embodiment of a contaminated soil treatment apparatus of the present invention.
FIG. 2 is a block configuration diagram of a second embodiment of a contaminated soil treatment apparatus.
[Explanation of symbols]
G: Exhaust gas Pw ... Powder 1 ... First embodiment of contaminated soil treatment device ... Second embodiment of contaminated soil treatment device ... Contaminated soil 5 ... Solid matter 7 ... Purified soil 9 ... Conveyor 10 ... Solids supply mechanism 11 ... First belt conveyor 12 ... Second belt conveyor 14 ... Hopper 16 ... Third belt Conveyor 20 ... Dry drum 26 ... Elevator 30 ... Powder supply mechanism 31 ... Powder input tank 32 ... Powder input pipe 33 ... Nozzle 34 ... Bag filter 36. ..Filter cloth
40 ... Cooling drum 44 ... Storage silo 48 ... Fourth belt conveyor 50 ... Vibrating sieve 52 ... Fifth belt conveyor

Claims (1)

  In a contaminated soil treatment apparatus capable of treating soil contaminated with heavy oil, a drying drum (20) for heat-treating the contaminated soil and a heavy oil volatile component adhering to the inner wall of the drying drum (20) A solid material supply mechanism (10) for supplying the solid material (5) for removal to the drying drum (20), and a bag filter (34) to which the exhaust gas (G) from the drying drum (20) is supplied. ), A powder supply mechanism for supplying the bag filter (34) with powder to which the heavy oil component in the exhaust gas passing through the bag filter (34) is attached, and a drying drum (20). A cooling drum (40) to which the purified soil (7) is sent, and a storage silo (44) into which the purified soil (7) cooled by the cooling drum (40) is put, and the storage silo (44) is at the bottom A funnel is formed on the A predetermined amount of the purified soil (7) and the solid matter (5) cooled from the funnel is supplied to the vibrating sieve (50) via the belt conveyor (48) in a batch manner, and the vibrating sieve (50 The contaminated soil treatment apparatus is provided with another conveyor (11) for recycling the solid matter (5) left on the net shelf in step) in the drying drum (20).

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