KR100952702B1 - The purification apparatus of a heavy metal contamination soil - Google Patents

Abstract

PURPOSE: A purification apparatus for heavy metal contaminated soil is provided to improve soil purification efficiency by inputting the contaminated soil to a heating container for heat-decomposing minute heavy metals before discharging. CONSTITUTION: A purification apparatus for heavy metal contaminated soil comprises the following: a heating container(10) including plural plasma torches(20) connected to a plasma generator; inlet(11) installed on the upper side of the heating container while supplying the contaminated soil to cover the torches; an discharging outlet(12) including a discharge bucket(40) intermittently rotating by a motor from the lower side of the heating container; a exhaust pipe(13) included in the upper side of the heating container to exhaust gas generated from a thermal decomposition process in the inside of the heating container; and plural heating nozzles(14) spraying steam at high pressure and high temperature to the inside of the heating container.

Description

The purification apparatus of a heavy metal contamination soil}

The present invention relates to an apparatus for purifying heavy metal contaminated soil, and more particularly, soil contaminated with fine heavy metal in powder or liquid form is intermittently introduced into a heating vessel in which a plasma torch is installed to thermally decompose fine heavy metal by heat of a plasma arc. The purified soil has a circulating structure discharged by the natural dropping method, so that it is possible to continuously purify the soil, it is easy to transport and install by miniaturization of the apparatus, and it is related to the heavy metal contaminated soil purification device that can actively remove heavy metals in the contaminated area.

In general, where gas stations and oil storage tanks are installed, oil is leaked into the ground and soil is contaminated. In particular, contaminated soils contain heavy metals in the form of fine powders. These heavy metals remain in the soil without being removed even when chemically treated with oxidizing agents and neutralizing agents. In particular, heavy metals containing lead, mercury, and cadmium are more deadly to humans and must be removed when cleaning contaminated soil.

In order to remove such heavy metals, a technique of thermally decomposing them by heat of plasma has been proposed. In US Pat. No. 5,181,797, a plasma torch was introduced into the soil to remove heavy metals by burning them.

However, this method requires a lot of work time because vertically drilling a plurality of wells around the contaminated soil and inserting a plasma torch inside, especially the contaminated soil remains inside the ground and does not enter the outside and is removed by continuous heating. Therefore, where the heat of the torch does not reach locally, there was a disadvantage in that heavy metals were not removed.

In addition, Korean Patent Publication No. 2000-0049289 is a method of inserting a torch horizontally into the ground to remove and remove heavy metals of the contaminated soil by plasma heat, but this is also a place where the torch does not heat because contaminated soil remains in the ground. There was a disadvantage that can not be removed reliably heavy metals in the contaminated area. In addition, since the gas generated in the process of pyrolysis of heavy metals can penetrate into the soil and have an adverse effect of spreading the contaminated area, this type of purification method has a technical disadvantage that is difficult to use.

The present invention was developed in view of the conventional problems, and an object of the present invention is to intermittently inject soil contaminated with fine heavy metal in powder form or liquid state into a heating vessel in which a plasma torch is installed, and thermally decompose fine heavy metal by heat of a plasma arc. The soil that has been oxidized or purified by hot air or steam of high temperature and high pressure has a circulation structure that is discharged by natural dropping method to enable continuous soil purification, and it is easy to transport and install due to the miniaturization of the device. It is to provide a heavy metal contaminated soil purification device that can be reliably removed.

To this end, the present invention is a device for pyrolyzing and purifying heavy metals of contaminated soil by arc heat of a plasma torch connected to a plasma generator, the heating vessel having a plurality of the torch arranged therein, and the contaminated soil at the top of the heating cylinder. Inlet is provided to the buried torch is buried, the lower portion of the heating vessel is provided with an outlet having a discharge bucket rotated by a motor so that contaminated soil stays inside the heating vessel and pyrolyzes, The upper portion is characterized in that the exhaust port for exhausting the gas generated in the process of pyrolysis of the contaminated soil.

According to the present invention, the soil in the contaminated area is dumped to the ground and loaded, and then foreign substances such as stones are sorted and introduced into the heating vessel of the purification device. In the heating vessel of the present invention, a plurality of plasma torches are disposed. When the contaminated soil is kept inside the heating vessel and a plasma arc is generated from the plasma torch, a high temperature is instantaneously formed around the torch to form a powder or Liquid heavy metals are burned and pyrolyzed. Gases generated during pyrolysis can be collected to filter out harmful substances and to release only harmful substances to the air to remove heavy metals contained in the soil in contaminated areas by active methods.

In addition, the liquid heavy metal is thermally decomposed and oxidized by high temperature, high pressure hot air or steam injected from a heating nozzle, so that the efficiency of removing the heavy metal is improved in connection with the plasma torch, and a plurality of rotary blades are disposed around the torch and the heating nozzle. It stirs up the contaminated soil and ensures that even heavy metals are burned uniformly without being aggregated or stagnated in one place.

In addition, the contaminated soil is introduced into the upper part of the heating tube to pyrolyze heavy metals and then discharged to have a circulating structure that allows for continuous purification of the soil, and is easy to move and install by reducing the volume of the contaminated soil. Since it can be treated in conjunction with the chemical treatment apparatus of the next process has the advantage of improving the purification performance.

1 is a perspective view of a purifier according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of the purifier according to an embodiment of the present invention. Purification apparatus of an embodiment of the present invention is provided with a vertical heating vessel 10 is empty. The heating tube 10 is provided with an inlet 11 for injecting contaminated soil to the upper portion, the lower portion is provided with a discharge port 12 for discharging the purified soil, therein across the heating tube 10 Torch 20 is installed in a plurality of temporary benches (21). The torch 20 is connected to the plasma generator 22 to generate a plasma arc, and has a performance of raising a temperature of about 200 ° C. or more in a radius of about 200 mm around the torch. The torch 20 is provided inside the heating tube 10 in a zigzag form to generate an arc toward the outlet 12 and to increase the ambient temperature evenly in conjunction with each other.

In addition, the torch 20 is not fixed and configured to repeat the forward and reverse rotation within the range of 90 degrees, so that it can radiate arc heat while stirring the contaminated soil, thereby preventing the condensation of contaminated soil and effectively burning heavy metals. . In addition, a plurality of rotary vanes 15 are provided inside the heating tube 10 to stir the contaminated soil accumulated in the heating tube 10 to prevent agglomeration, and the contaminated soil is not stagnant, but the torch 20 or the outlet 12 is lower. To the side). Preferably, the rotary blades 15 are disposed between the torch 20 to stir the contaminated soil around the torch 20 to help uniform combustion of heavy metals and to flow well to the outlet of the lower portion without stagnation in one place. It is good to do.

In addition, a plurality of heating nozzles 14 are provided in the heating cylinder 10. The heating nozzle 14 is a high-temperature, high-pressure steam or hot air blows into the heating tube, heavy metals are oxidized at about 800 ℃ ~ 1000 ℃ heavy metal powder or contaminated soil by supplying hot air or steam having this temperature condition or Oxidize the liquid heavy metal.

The inlet 11 has an inlet bucket 30 for dropping contaminated soil into the heating vessel 10. The inlet bucket 30 is a plurality of plate-shaped or arc-shaped buckets are formed long along the axial direction and rotated by the motor 31, the inlet 11 is blocked by these buckets in a stopped state, the heating tube 10 Make the interior close to the sealed system. Therefore, the gas generated while the heavy metal of the contaminated soil is prevented from being exhausted to the outside of the inlet 11 as much as possible.

The outlet 12 is provided with a discharge bucket 40 that is rotated by the motor 41 to discharge the purified soil to the bottom. The discharge bucket 40 is in a stationary state while the torch 20 is operated to allow the contaminated soil to stay inside the heating vessel 10 without flowing down to the outlet 12.

In addition, an upper portion of the heating vessel 10 is provided with an exhaust port 13 for exhausting the gas generated in the process of pyrolysis of heavy metal to the exhaust fan 50, the oil vapor recovery unit 51, the adsorber 52 and the deodorizer 53 Finally, harmless air is exhausted.

One embodiment of the present invention configured as described above is to filter the soil in the contaminated area using a heavy equipment such as forklane and then filter out the gravel and foreign matter in the sorting machine and put the contaminated soil in the inlet (11). At this time, the input bucket 30 rotated by the motor 31 is operated to actively drop the contaminated soil into the heating tube 10.

When the soil is loaded into the heating tube 10 and the torch 20 is buried, the operation of the input bucket 30 is stopped to block the inflow of the soil, and the plasma generator 22 is operated. In the torch 20 connected to the plasma generator 22, an arc of 2000 ° C. is generated at an instant to thermally decompose powdered heavy metal contained in the soil around the torch. The plasma arc is environmentally friendly because no harmful substances such as dioxins are generated because it burns heavy metals without oxygen, and the torch 20 is disposed in the heating vessel 10 in a staggered manner in a zigzag form to uniformly burn the contaminated soil. Can be removed effectively.

In addition, when the heating nozzle 14 is operated together while the torch 20 is operated, high-temperature, high-pressure steam or hot air is provided to the heating tube 10 to improve the removal performance of heavy metals, in particular, by oxidizing and removing the heavy metals in the liquid phase. do. In addition, the fluidity of the contaminated soil due to the hot air or steam is rich, there is also the effect that the soil is uniformly dispersed in the heating tube 10 without agglomeration or one side. In addition, when the plurality of rotary blades 15 are operated together, the contaminated soil is agitated and diffused, so that the plasma arc or hot air or steam radiated and sprayed from the torch 20 and the heating nozzle 10 is uniformly spread on the contaminated soil to remove heavy metals. Performance is improved.

The gas generated in the process of removing heavy metals passes through the exhaust port (13) and passes through the vapor recovery unit (51) to remove harmful substances such as volatilized organic compounds, while passing through the adsorber (52) and the deodorizer (53) and materials such as dioxins. The odor is removed and then exhausted.

When the heavy metal of the contaminated soil is removed by operating the torch 20 for a predetermined time, the drain bucket 40 of the lower part is operated so that the soil of the heating container 10 falls to the outlet 12, and then using a conveyor belt. One cycle is completed while transferring to the treatment process and the above process is repeated to purify the soil in the contaminated area.

1 is a perspective view of a purifier of an embodiment of the present invention

2 is a cross-sectional view of the purifying apparatus of one embodiment of the present invention.

<Code Description of Main Parts of Drawing>

10: heating tube 11: inlet

12: exhaust port 13: exhaust port

14: heating nozzle 15: rotary blade

20: torch 21: hypothesis

22: plasma generator 30: input bucket

40: exhaust bucket 50: exhaust fan

51: vapor recovery unit 52: adsorber

53: deodorizer

Claims (5)

delete delete delete A heating cylinder having a plurality of plasma torches connected to a plasma generator is provided therein, and an inlet for introducing contaminated soil to bury the torch is provided at an upper portion of the heating cylinder, and a lower portion of the heating cylinder is provided by a motor. An outlet having an outlet bucket intermittently rotated is provided to allow the contaminated soil to remain in the heating vessel and to be thermally decomposed, and an upper portion of the heating vessel is provided with an exhaust port for exhausting the gas generated during the pyrolysis of the contaminated soil. A plurality of rotary blades are provided between the torch to bend the contaminated soil without agglomeration, and a plurality of heating nozzles are provided inside the heater to spray high-temperature, high-pressure steam or hot air to the contaminated soil. In the heavy metal contaminated soil purification device for oxidizing and removing heavy metals, The exhaust port is connected to the exhaust fan, The rear of the exhaust fan is a heavy metal contaminated soil purification apparatus characterized in that the oil vapor recovery unit for collecting volatile organic compounds, the adsorber for collecting harmful substances and the deodorizer for removing the odor are sequentially engaged. The method of claim 4, wherein The inlet is provided with an inlet bucket for introducing the contaminated soil into the heating tube is intermittently rotated by a motor to block the external leakage of the gas generated during the pyrolysis process of the contaminated soil.

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