KR102453257B1 - Contaiminated soil cleaning apparatus - Google Patents

Abstract

The present invention relates to a contaminated soil cleaning apparatus with enhanced purification efficiency of contaminated soil including a fluid, which comprises: a fluid removal unit disposed on a top to make contaminated soil, oxygen, and steam react and then, evaporate and remove a fluid from the contaminated soil; a cleaning unit communicating downward with the fluid removal unit through a flow path to allow reaction gas generated by the evaporation of the contaminated soil and the fluid to be introduced thereinto, and having an injection pipe injecting water to the introduced contaminated soil and reaction gas to clean the same; and a contact reaction unit having a gas flow hole formed in the upper part of the cleaning unit, divided from the cleaning unit by a partition with an increasing diameter downside, having a contact layer formed therein, and including a reaction solution injection pipe for injecting a sodium chlorate toward a top of the contact layer.

Description

Contaminated soil cleaning device {CONTAIMINATED SOIL CLEANING APPARATUS}

The present invention relates to a cleaning device for contaminated soil containing oil.

As a result of rapid industrial development and human life, various pollutants are contaminating the soil, and organic matter, inorganic salts and oils are contaminating the soil. Organic matter is decomposed by microorganisms in the soil, etc., and inorganic salts are also soluble in rain, so this is not a problem.

However, soil contaminated by oil does not dissolve well in water and continues to remain and accumulate in the soil, so soil contamination is further aggravated. There was a problem that caused it.

In order to solve the above problems, there are generally a biological treatment method, leakage shielding technology, and thermal treatment method for contaminated soil, but these methods are greatly affected and restricted by field conditions and the treatment cost is very high.

In addition, the soil washing method is applied as one of the methods for purifying oil-contaminated soil. However, there is still a problem in that the washing efficiency is not great when the washing method is applied to oil-contaminated soil.

Korean Patent Publication No. 10-2012-0064806

The present invention has been devised to solve the above problems, and an object of the present invention is to provide an apparatus for cleaning contaminated soil with improved purification efficiency for contaminated soil containing oil.

As a means for solving the above problems, the contaminated soil washing apparatus of the present invention (hereinafter referred to as "the apparatus of the present invention") reacts with the contaminated soil, oxygen and steam at the top to vaporize and remove oil from the contaminated soil. denial; a washing unit in which the oil removal unit communicates in the downward direction through the flow path so that the contaminated soil and the reaction gas generated by the vaporization of the oil are introduced, and a spray pipe is formed for spraying water to the introduced contaminated soil and the reaction gas for washing; A gas flow hole is formed in the upper part of the washing part, the contact reaction part is partitioned from the washing part by a partition wall having a diameter increasing in the downward direction, a contact layer is formed therein, and a reaction solution injection pipe for spraying sodium chlorate solution is formed on the contact layer upper part. ; is characterized in that it is included.

As an example, the injection pipe is configured in a ring shape with different diameters, and is configured in a plurality on the inner periphery of the partition wall and the washing unit.

As an example, the injection pipe is spirally configured on the inner periphery of the partition wall and the washing unit.

As an example, the injection pipe is characterized in that the water is sprayed downward and in the center direction.

As an example, an outer partition is formed so that a space is formed in the lower portion of the partition wall and a second gas flow hole is formed on a lower surface thereof, and an end protrudes into the space from the inner periphery of the washing unit and the end is spaced apart from the side surface of the external partition wall and a reaction solution storage unit communicating with the space and configured on the outer periphery of the washing unit.

As an example, the partition wall has a flat plate portion configured at an upper end portion and a perforated portion is configured to form a plurality of gas flow holes in connection with the flat plate portion, and the induction end has a side surface of the external partition wall at a position opposite to the flat plate portion A separation is formed and a guide hole is formed at the other end, and a second flat plate is formed on the lower surface of the outer bulkhead at a position opposite to the guide hole, and a plurality of second gas flow holes are connected to the second flat portion. It is characterized in that the second perforated portion is configured to be formed.

As an example, an excitation ball composed of a spring and a weight is further configured at the end of the induction end.

As described above, the apparatus of the present invention has the advantage of being able to purify contaminants including oil.

In addition, there is an advantage in that it is possible to purify the gas generated during the purification process.

1 is a side cross-sectional view showing a basic example of the present invention,
2 and 3 are cross-sectional views showing embodiments of the injection pipe as one configuration of the present invention,
4 and 5 are cross-sectional views and operational state diagrams showing an embodiment of the present invention.

Hereinafter, the configuration and operation of the present invention will be described in more detail based on the accompanying drawings. In describing the present invention, the terms or words used in the present specification and claims are based on the principle that the inventor can appropriately define the concept of the term in order to best describe his or her invention. It should be interpreted as meaning and concept consistent with the technical idea of

The apparatus 1 of the present invention includes an oil removal unit 11 for reacting polluted soil, oxygen and steam at the top as shown in FIG. 1 ; The oil removal unit 11 and the oil passage 131 communicate in the downward direction to allow the reaction gas generated by the vaporization of the contaminated soil and oil to flow in, and to spray water to the introduced contaminated soil and reaction gas for washing The cleaning unit 12 in which the tube 121 is formed; A gas flow hole 132-1 is formed in the upper portion of the cleaning portion 12, and is partitioned from the cleaning portion 12 by a partition wall 132 having a larger diameter in the downward direction, and a contact layer 133 is formed therein. and a contact reaction unit 13 having a reaction liquid injection pipe for spraying a sodium chlorate solution on the contact layer 133.

The oil removal unit 11 corresponds to a configuration in which contaminated soil, steam, and oxygen are introduced to cause an oxidation reaction.

In the oil removal unit 11, it is appropriate to inject an amount smaller than the amount of oxygen required for complete combustion so that partial oxidation can occur. When the oil contained in the contaminated soil is completely burned, air polluting gases such as NOx and SOx are generated and discharged, which is not preferable. Therefore, the oxygen reaction conditions must be controlled to achieve incomplete combustion, that is, partial oxidation.

That is, the contaminated soil is injected into the oil removal unit 11, and comes into contact with the simultaneously injected oxygen and steam to undergo an oxidation reaction. The contaminated soil and oxygen injected into the oil removal unit 11 may be heated and supplied by indirect heat exchange with steam. In addition, it is preferable that the contaminated soil and oxygen injected into the oil removal unit 11 are injected under pressure higher than the pressure in the oil removal unit 11 . In the oil removal unit 11, the oil contained in the soil, which is a raw material, comes into contact with oxygen and steam and undergoes combustion and/or thermal decomposition, and through a partial oxidation reaction, hydrogen, carbon monoxide, carbon dioxide, nitrogen, hydrogen, ammonia, hydrogen sulfide and / or converted to a reaction gas containing water vapor is produced.

On the other hand, oil-contaminated soil is produced as purified soil in which oil is separated from the contaminated soil by converting the oil contained therein to a reaction gas through the above reaction. At this time, in order to prevent vitrification of the soil due to high temperature, the raw material supply amount and oxygen injection amount should be adjusted so that the reaction temperature of the partial oxidation reaction does not exceed 1200°C at most, preferably 200 to 800°C.

In this way, contaminated soil and reaction gas from which oil generated by oxidation in the oil removal unit 61 has been removed is introduced into the washing unit 12 at the bottom through the flow path 131 . Contaminated soil and reaction gas from the oil removal unit 11 are cooled and the contaminated soil from which oil has been removed through the injection of water by the injection pipe 121 in the washing unit 12 to remove pollutants. At the same time, the latent heat and contaminants are removed from the reaction gas.

Next, the reaction gas from which latent heat and contaminants are primarily removed in the washing unit 12 is moved upward from the washing unit 62 through the gas flow hole 132-1 of the partition wall 132 for the contact reaction. It is to flow into the part (13).

The reaction gas introduced into the contact reaction unit 13 is in a high-temperature and high-humidity state, that is, contains saturated moisture by spraying water for washing and cooling in the washing unit 12 . If such high-temperature and humid reaction gas is discharged as it is, there may be a problem that various pollutants are discharged due to the condensation of saturated moisture when in contact with outside air during the discharge process.

Therefore, in this embodiment, the reaction gas washed and cooled by water spray is first absorbed and absorbed by the reaction gas in latent heat and moisture from the reaction gas in the contact reaction unit 13, and at the same time, contaminants are adsorbed to produce a good quality reaction gas. to be discharged outside.

To this end, a contact layer 133 is formed on the lower portion of the contact reaction unit 13, a reaction liquid injection pipe (not shown) is formed on the contact layer 133, and a processing gas discharge line is formed on the reaction liquid injection tube. (134) is formed.

The sodium chlorate solution is injected from the reaction liquid injection pipe, and the sodium chlorate solution absorbs and absorbs latent heat and moisture of the reaction gas, and serves to adsorb contaminants contained in the reaction gas. The sodium chlorate has excellent contaminant adsorption properties, and at the same time has a high solubility and a large difference in solubility depending on temperature, it is easy to recover at a low temperature. In addition, sodium chlorate causes an endothermic reaction upon dissolution, so that the latent heat recovery characteristic of the reaction gas is excellent.

The concentration of the sodium chlorate solution is preferably adjusted to 40 to 80 wt%. If the concentration is less than 40wt%, the moisture absorption rate is lowered, and when the concentration exceeds 80wt%, there is a problem in that sodium chlorate is precipitated or solidified.

The contact layer 133 corresponds to a configuration to take a long reaction time between the reaction gas and the sodium chlorate solution. The contact layer 133 may be formed in various ways, and may be formed of, for example, a ceramic carrier such as a rare earth ball.

By such a configuration, the device 1 of the present invention primarily removes oil from the contaminated soil, and secondarily, the oil is washed to remove other contaminants from the contaminated soil from which oil has been removed, and at the same time, the oil In the case of the reaction gas generated during the removal process, moisture and contaminants are also discharged in a removed state.

Soil purified in this way is stored in the lower lock hopper although the reference number is not shown. When a certain amount is collected, it can be continuously discharged as final restored soil.

On the other hand, as shown in FIG. 1 , when the spray pipe 121 is configured in a shape that crosses the washing unit 12 , an impact may be given to the spray pipe 121 in the process of falling of the contaminated soil, and in particular, the dropping of the contaminated soil The reaction gas must also be lowered to the washing unit 12 by force. However, if the rising force of the reactive gas is large, there is a problem in that it flows back into the oil removal unit 11 and inhibits the oxidation reaction in the oil removal unit 11 . have.

Accordingly, in the present invention, two examples of the injection pipe 121 are presented in FIGS. 2 and 3 .

As the first embodiment is shown in FIG. 2 , the injection pipe 121 of this embodiment is configured in a ring shape with different diameters and is configured in plurality on the inner periphery of the partition wall 132 and the washing unit 12 . do it with

As shown in the drawing, the diameter is different from the upper end of the partition wall 132 to the inner periphery of the washing unit 12, and a ring-shaped injection pipe 121 is configured.

In addition, in each injection pipe 121, the plurality of injection nozzles are configured to form an inclined gradient in the downward and central directions, so that the cleaning liquid is injected in the downward and central directions.

By this configuration, each injection pipe 121 does not interfere with the falling contaminated soil, and in particular, the descending force by the washing liquid sprayed from the upper end of the partition wall 132 to the washing unit 12 is greatly applied to the flow path 131 . ) is to generate a force for strongly introducing the reaction gas into the washing unit 12 as a negative pressure is formed. That is, the reverse flow of the reaction gas is used as a control earth.

In addition, the cleaning solution is sprayed at a plurality of locations while varying the height to further double the cleaning efficiency of the contaminated soil. In other words, it is possible to clean the contaminated soil uniformly without dead areas.

A second embodiment is shown in FIG. 3 , wherein the injection pipe 121 of this embodiment is spirally configured on the inner periphery of the partition wall 132 and the washing unit 12 . Also in this embodiment, the plurality of injection nozzles in each injection pipe 121 are configured to form an inclined gradient in the downward and central directions, so that the cleaning liquid is injected in the downward and central directions.

In the case of this embodiment, the same operating mechanism is expressed as in the first embodiment, but in this embodiment, the partition wall 132 is spirally configured to the inner periphery of the washing unit 12, and the washing liquid is sprayed with the contaminated soil more densely in the height direction. This is to double the washing efficiency, and the washing liquid is sprayed in a spiral downward and central direction to form a vortex that descends more strongly in the central part, so that the counterflow control power of the reaction gas is more strongly expressed.

Meanwhile, in the present invention, as shown in FIGS. 4 and 5 , an embodiment for blocking the reaction liquid reacted in the contact reaction unit 13 from flowing into the washing unit 12 is proposed.

In the present embodiment, an outer partition 14 is formed so that a space 143 is formed in the lower portion of the partition wall 132 and a second gas flow hole 141-1 is formed in the lower surface 141, and the cleaning unit (12) a guide end 15 protruding from the inner periphery to the space 143 and having an end spaced apart from the side surface 142 of the outer partition wall 14, and the cleaning unit communicating with the space 143 (12) It is characterized in that the reaction solution storage unit 17 configured on the outer periphery is further included.

The reaction gas is introduced into the space 143 through the second gas flow hole 141-1 on the lower surface 141 of the outer partition 14 in the process of ascending after descending into the washing unit 12, and the guide end 15 ) to flow into the contact reaction unit 13 through the gas flow hole 132-1 of the partition wall 132 . In addition, the reaction liquid reacted with the reaction gas in the contact reaction unit 13 falls to the induction end 15 through the gas flow hole 132-1 of the partition wall 132 and descends on the induction end 15. It falls to the lower surface 141 of the external partition wall 14 through the guide hole 151 to be described below and is guided to the reaction solution storage unit 17 . A communication hole 123 is formed in the washing unit 12 so that the reaction solution storage unit 17 and the space 143 communicate with each other, and the reaction solution falling to the lower surface 141 of the external partition wall 14 is stored as the reaction solution. It is to be guided to the part (17).

In order to achieve this mechanism of action more efficiently, the partition wall 132 has a flat plate portion 132-2 configured at an upper end thereof, and a plurality of gas flow holes 132-1 connected to the flat plate portion 132-2. The perforated portion 132-3 is configured to be formed. The reason why the flat plate part 132-2 is configured is that the reaction liquid falling from the contact reaction part 13 falls at a distance formed by the induction end 15 from the side surface 142 of the external partition wall 14, so that the second gas This is to block the inflow into the washing unit 12 through the flow hole 141-1. To this end, as shown in FIG. 5 , the end of the guide end 15 should extend beyond the virtual line H1 in the vertical direction from the end of the flat plate 132-2.

In addition, the induction end 15 has a guide hole 151 formed at the end contacting the inner periphery of the washing unit 12 so that the condensed water descending through the gas flow hole 132-1 of the partition wall 132 ( w2) descends on the guide end 15 and is guided to the lower surface 141 of the external partition 14 through the guide hole 151 to the second flat plate portion 141-2 to be described below.

In the induction stage 15 , the condensed water w2 formed while in contact with the induction stage 15 while the reaction gas g is upward in addition to the reaction liquid is guided while descending on the lower surface of the induction stage 15 . It descends from the position where the hole 151 is formed so as to be guided to the second flat plate part 141-2. By reducing the moisture content of the reaction gas g by the formation of the condensed water w2, a function of reducing the load on the contact reaction unit 13 is also expressed. To this end, it is appropriate that the induction stage 15 is made of a material having a high heat transfer rate such as stainless steel and aluminum to increase the efficiency of forming the condensed water w2 by contact with the reaction gas g.

In addition, the lower surface 141 of the external partition wall 14 has a second flat plate portion 141-2 configured at a position opposite to the guide hole 151, and is connected to the second flat plate portion 141-2. It is characterized in that the second perforated portion 141-3 is configured so that the second gas flow hole 141-1 is formed.

The reason that the second plate part 141-2 is configured is to block the reaction liquid and condensed water falling from the contact reaction unit 13 from flowing into the washing unit 12 and react the collected reaction liquid and condensed water. This is to guide it to the liquid storage unit 17 . To this end, as shown in FIG. 5 , the end of the second flat plate 141 - 2 should extend from the end of the guide hole 151 to pass the virtual line H2 in the vertical direction.

On the other hand, when the removal of the condensed water w2 condensed on the lower surface of the induction stage 15 is delayed, the moisture content of the reactive gas g can be increased while coming into contact with the upward reaction gas g, so the generated condensed water ( The prompt removal of w2) is required.

Accordingly, in this embodiment, an excitation sphere 16 composed of a spring 161 and a weight 162 is further configured at the end of the guiding end 15, and by the configuration of the excitation sphere 16, the guiding end The condensed water w2 condensed on the lower surface of the induction end 15 by inducing vibration in (15) descends on the lower surface of the induction end 15 so that it is removed promptly. The induction stage 15 generates vibrations in the process of dropping the contaminated soil even without the excitation sphere 16, and the excitation sphere 16 is configured to further double this vibration to further increase the removal efficiency of the condensed water w2. is to make it

Those skilled in the art from the above description will be able to see that various changes and modifications are possible without departing from the technical spirit of the present invention. Accordingly, the technical scope of the present invention is not limited to the content described in the detailed description of the specification, but should be defined by the claims.

1: device of the present invention 11: oil removal unit
12: washing unit 13: contact reaction unit

Claims (7)

An oil removal unit for vaporizing and removing oil from the contaminated soil by reacting the contaminated soil with oxygen and steam on the top;
a washing unit in which the oil removal unit communicates in the downward direction through the flow path so that the contaminated soil and the reaction gas generated by the vaporization of the oil are introduced, and a spray pipe is formed for spraying water to the introduced contaminated soil and the reaction gas for washing;
A gas flow hole is formed in the upper part of the washing part, the contact reaction part is partitioned from the washing part by a partition wall having a diameter increasing in the downward direction, a contact layer is formed therein, and a reaction solution injection pipe for spraying sodium chlorate solution is formed on the contact layer upper part. ;
Contaminated soil washing device, characterized in that it is included.
The method of claim 1,
The injection pipe is configured in a ring shape with different diameters, and a contaminated soil cleaning apparatus, characterized in that it is configured in plurality on the inner periphery of the partition wall and the washing part.
The method of claim 1,
The injection pipe is a contaminated soil cleaning apparatus, characterized in that configured in the inner periphery of the partition and the washing part in a spiral.
4. The method of claim 2 or 3,
The spray pipe is a polluted soil washing device, characterized in that for spraying water in the downward and central directions.
The method of claim 1,
An external partition wall for forming a space in the lower portion of the partition wall and forming a second gas flow hole on a lower surface thereof, an induction end protruding from the inner periphery of the washing unit into the space and having an end spaced apart from the side surface of the external partition wall; , Contaminated soil washing apparatus, characterized in that it communicates with the space and further comprises a reaction solution storage unit configured on the outer periphery of the washing unit.
6. The method of claim 5,
The partition wall is configured with a flat portion at the upper end and a perforated portion is formed so that a plurality of gas flow holes are formed in connection with the flat portion,
The guiding end has a guiding hole formed at the other end so that the end is spaced apart from the side surface of the external partition at a position opposite to the flat plate,
Contaminated soil cleaning, characterized in that the lower surface of the external bulkhead is configured with a second flat portion at a position opposite to the guide hole, and a second perforated portion is formed in connection with the second flat portion to form a plurality of second gas flow holes. Device.
7. The method of claim 6,
Contaminated soil washing apparatus, characterized in that the excitation sphere consisting of a spring and a weight is further configured at the end of the induction end.

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