KR20210073777A - The modularized Underground thermal desorption aftertreatment System - Google Patents

Abstract

The present invention relates to a modularized after-treatment system for in-situ thermal deposition, capable of separating and recycling an oil component when processing contaminated gas emitted in the in-situ thermal deposition. According to the present invention, an after-treatment system for in-situ thermal deposition includes: a first module including a condenser to introduce and liquefy contaminated gas generated through the in-situ thermal deposition, and a gas-liquid separator to receive the liquefied contaminated gas emitted from the condenser and to separate a liquid and gas; a second module including an incineration device to receive the gas separated from the gas-liquid separator and to perform heat treatment, and a heat exchanger to heat-exchange the treatment gas generated from the incineration device and to discharge the treatment gas; and a third module including an oil-liquid separator to receive liquid separated from the gas-liquid separator to separate an oil component from a moisture component, an oil tank to receive the oil component from the oil-liquid separator and to store the oil component, and a water-treatment device to receive the moisture component from the oil-water separator to remove a contaminant material from the moisture component.

Description

The modularized Underground thermal desorption aftertreatment system

The present invention separates and reuses oil in the treatment of polluting gas generated in geothermal desorption, and can be discharged to the outside with pollutants removed from the liquid and gas generated in this process, and these devices are modularized for portability And it relates to a system with improved field applicability.

Since the Industrial Revolution, today's industry has been developed almost entirely based on fossil fuels, but today, environmental pollution accompanying the development of industry is approaching as a serious problem that threatens human life.

Among the environmental pollution as described above, soil pollution poses a very serious threat to food production and not only causes water pollution through groundwater pollution, but also has a problem in that the treatment is not easy.

However, today's industry is based on the machinery industry, and almost all machines require oil such as lubricant or fuel. In particular, oil consumed by various vehicles, which is one of the most essential things in modern life, is consumed in a large amount that cannot be measured. The spillage is seriously contaminating the soil.

As described above, it takes a considerable period of time for soil contaminated by oil to naturally recover, so when arable land is contaminated, it has a fatal adverse effect on the production of various agricultural products as well as contaminates groundwater, thereby depleting drinking water sources. will cause

As an example of the technology to purify the contaminated soil, the underground thermal desorption polluted soil purification technology has been proposed. This underground thermal desorption polluted soil purification technology is a 'heating technology through in-situ thermal treatment' to purify the unsaturated versus high concentration oil pollution area within a short period of time. and 'recovery technology of petroleum oil vapor generated during heat treatment' is the main focus.

As an example of the existing technology, Korean Patent Registration No. 0798763 includes the steps of excavating a plurality of injection holes and extraction holes in oil-contaminated soil (100); injecting a high-temperature fluid into the contaminated soil through the injection hole (200); Sucking a mixed fluid of a high-temperature fluid and a contaminant from the extraction hole (300); gas-liquid separation of the mixed fluid into a contaminant liquid and a contaminant gas (400); Separating the contaminant solution into oil and water (500); It proposes a geothermal thermal desorption method for oil-contaminated soil purification, characterized in that it comprises a step 600 of adsorbing and removing volatile pollutants contained in the polluting gas.

However, in the case of the above technology, although the separation of oil from the result of geothermal thermal desorption is presented, the presentation on the treatment of gases and liquids generated in this process is somewhat insufficient, so there is a problem of secondary damage due to the leakage of such gases and liquids. can be caused

Korean Patent Registration No. 0798763

The present invention has been devised to solve the above problems, and in treating the polluting gas generated in geothermal thermal desorption, the oil is separated and reused, and the liquid and gas generated in this process are discharged outside with contaminants removed. It is intended to provide a system that can be discharged.

The modular geothermal desorption post-treatment system of the present invention (hereinafter referred to as "the system of the present invention") for achieving the above object is a condenser in which polluting gas generated by geothermal desorption is introduced and liquefied, and contamination liquefied from the condenser a first module including a gas-liquid separator through which gas is introduced to perform gas-liquid separation; a second module comprising: an incinerator in which the gas separated from the gas-liquid separator is introduced and heat-treated; and a heat exchanger configured to discharge the treated gas generated from the incinerator after heat exchange; An oil-water separator that receives the liquid separated from the gas-liquid separator to separate oil and moisture, an oil tank that receives and stores oil from the oil-water separator, and receives moisture from the oil-water separator to remove contaminants from the moisture and a third module including a water treatment device.

As an example, the water treatment device includes a coagulation tank, a sedimentation tank, a sludge filter, and a filtration tank.

As an example, the incineration device may include: a housing including an inlet line through which the gas separated from the gas-liquid separator is introduced at a lower end, and an outlet line through which the incinerated treated gas is discharged to the heat exchanger at the upper end; and a plurality of heating rods configured to be detachably attached to the housing and configured to apply heat to the introduced gas.

As an example, the housing is partitioned by a bulkhead filled with filter media, an incinerator for heat-treating gas is configured at the lower portion, a collecting section for collecting processing gas generated through heat treatment is configured at the upper portion, and a fastening hole to which the heating rod is fastened on the upper surface characterized by being formed.

As an example, the heating rod includes a head that is fastened to the fastening hole and has a terminal exposed to enable electrical connection with an external power source, and a body in which a heating wire is embedded in the lower part of the head to generate heat, and the body is inside It is characterized in that it consists of a heating part which is embedded in the heating part and inserted into the incineration part, and a non-heating part embedded in the collecting part on the upper part of the heating part.

As an example, the heating part and the non-heating part are made of a thermal barrier material, a space is formed therein, and a connection body having a connection hole for electrical connection with a heating wire and a heating part and a non-heating part are respectively fastened at both ends of the connection body It is characterized in that it is connected by a heat-blocking connector including a fastening rim.

As an example, a through hole opposite the fastening hole is formed in the partition wall to allow the body to pass therethrough, and a second through hole through which the non-heating unit passes through the body opposite the through hole in the central portion at the position where the through hole is formed, It is characterized in that the condensed water storage device is included in the condensed water storage device to be connected to the second through hole so that the cross section is formed in a groove shape so that the condensed water droplets are stored in the non-heating part.

As an example, the oil tank is characterized in that the surface-modified activated carbon with polyvinyl pyrrolidone vinyl acetate copolymer (PVP-VA) is filled.

Therefore, the system of the present invention separates and recycles the oil from the polluting gas generated as a result of geothermal thermal desorption, and in the case of gas and liquid generated in this process, removes the pollutants mixed therein and discharges it to the outside. It has the advantage of enabling the complete treatment of the polluting gas generated from geothermal thermal desorption.

In addition, the system of the present invention has the advantage that the mobility is improved to the area to be treated with the contaminated soil through modularization, and can be easily used by assembly in the field.

1 is a schematic diagram showing the system of the present invention,
2 is a side cross-sectional view showing the device of the present invention;
3 is a schematic diagram showing a heating rod as one configuration of the present invention,
Figure 4 is a side cross-sectional view showing an example of the heating rod shown in Figure 3,
5 is a partial view showing another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

In the system 100 of the present invention, as shown in FIG. 1 , the condenser 110 into which the polluting gas generated by geothermal thermal desorption is introduced and liquefied, and the liquefied pollutant gas is introduced from the condenser 110 to separate gas-liquid a first module (A) including a gas-liquid separator 120 to be removed; A second module including an incinerator 130 in which the gas separated from the gas-liquid separator 120 is introduced and heat-treated, and a heat exchanger 170 that heats and discharges the treated gas generated from the incinerator 130 after heat exchange. (B); An oil-water separator 140 that receives the liquid separated from the gas-liquid separator 120 and separates oil and moisture, an oil tank 150 that receives and stores oil from the oil-water separator 140, and the oil-water separator ( and a third module (C) including a water treatment device 160 that receives moisture from 140) and removes contaminants from the moisture.

That is, the system 100 of the present invention is composed of modules (A, B, C) equipped with each detailed device as shown in FIG. 1 to facilitate mobility and field assembly.

Hereinafter, each device configured in each module (A, B, C) will be described.

The condenser 110 corresponds to a configuration in which polluting gas generated by geothermal thermal desorption is introduced and liquefied, and the condenser 110 has various well-known technologies, and detailed description of the mechanism of action thereof will be omitted.

The pollutant gas liquefied through the condenser 110 is a mixed fluid in which a polluting liquid mixed with oil, polluted water, etc., and volatile components generated from the oil are mixed, and this mixed fluid passes through the gas-liquid separator 120, Gas-liquid separation is performed with volatile components generated from oil and contaminated liquid mixed with contaminated water. In the case of the gas-liquid separator 120, various well-known technologies exist, so a detailed description thereof will be omitted.

As a liquid separated through the gas-liquid separator 120 in this way, the contaminant liquid flows into the oil-water separator 140 at the rear stage, and the volatile components generated from the oil as a gas flow into the incineration device 130 .

As the gas separated through the gas-liquid separator 120, the volatile components generated from the oil are once again passed through the condenser 110 to liquefy the separated gas, and the liquefied gas is once again subjected to the gas-liquid separator 120. As a liquid separated through the gas-liquid separator 120 to pass through, the contaminant liquid is introduced into the oil-water separator 140 at the rear stage, and the volatile components generated from the oil as a gas are introduced into the incineration device 130. is showing

The oil-water separator 140 is a liquid separated through the gas-liquid separator 120, and the pollutant is introduced to separate it into oil and water. The separated oil is transferred to the oil tank 150 at the rear end, and the separated oil is energy. It is to be reused as a source, and the separated water is to be discharged by the water treatment device 160 at the rear stage to remove contaminants mixed in the water to discharge the treated water. In the case of the oil-water separator 140, various well-known technologies exist, so a detailed description thereof will be omitted.

In the water treatment device 160, as mentioned above, the water separated from the oil-water separator 140 is treated with a water quality standard suitable for discharge. In FIG. 1, the water separated from the oil-water separator 140 is a coagulation tank ( 161), the flocculation tank 161 is to agglomerate contaminants from the introduced moisture by supplying chemicals from the chemical tank, although no reference numerals are shown. The moisture that has undergone such a reaction is introduced into the settling tank 162 at the rear end to separate the contaminants from which agglomeration has occurred in the settling tank 162 through precipitation. In this way, the pollutants deposited in the sedimentation tank 162 are introduced into the sludge filter 164 at the rear end to be caked, and the water that has passed through the settling tank 162 is filtered in the filter tank 163 at the rear end, and then the treated water is to make it a discharge.

On the other hand, as described above, the gas separated through the gas-liquid separator 120 and the volatile components generated from the oil flow into the incinerator 130 , and the incinerator 130 burns the volatile components generated from the oil. By doing so, the gas from which the contaminants have been removed is discharged to the outside.

In addition, as shown in FIG. 1 , the processed gas generated from the incinerator 130 is discharged after heat exchange through the heat exchanger 170, and the high-temperature gas that has been burned at a high temperature in the incinerator 130 is discharged. Accordingly, the latent heat and the like from the high-temperature gas are used as an energy source, and the heat exchanger 170 is passed to remove the white smoke. In the case of the heat exchanger 170 as well, various well-known technologies exist, and thus a detailed description thereof will be omitted.

On the other hand, when the treated gas generated from the incineration device 130 is discharged to the heat exchanger 170 as it is, a load may be generated on the heat exchanger 170 by foreign substances mixed in the treated gas, and the moisture contained in the treated gas may be In the heat exchanger 170 , condensed water is deposited in the heat exchange process, thereby reducing heat exchange efficiency or causing malfunction of the heat exchanger 170 . Accordingly, in the present invention, the incineration apparatus 1 is presented in FIG. 2 and the like as an embodiment to solve this problem.

In the incineration apparatus 1 of this embodiment, as shown in FIG. 2, the inlet line 25 through which the gas separated from the gas-liquid separator 120 flows in from the lower end, and the incinerated treated gas at the upper end of the heat exchanger 170 A housing 20 including a discharge line 26 discharged to the; A plurality of heating rods (3) configured to be detachably attached to the housing (20) and apply heat to the introduced gas; characterized in that it includes a.

The housing 2 is partitioned by a partition wall 23 filled with a filter material 233, and an incinerator 21 for heat-treating the gas is configured at the lower portion, and a collecting unit for collecting the process gas generated through heat treatment at the upper portion ( 22) is configured and a fastening hole (not shown) to which the heating rod 3 is fastened is formed on the upper surface.

Although the housing 2 is not shown in the drawings, it is appropriate that the outer surface is formed of a heat insulating material or a heat insulating structure to control the outflow of heat by the heating rod 3 to the outside. Here, since various known materials or known structures exist for the insulating material or the insulating structure, a detailed description thereof will be omitted.

The heating rod 3 is fastened to the fastening hole as shown in FIG. 2 and the like. Although not shown in the drawings, the terminal 311 that enables electrical connection with an external power supply means is exposed with a head 31 and , It characterized in that it comprises a body 32 in which the heating wire 321-1 is embedded in the lower part of the head 31 to generate heat.

The head 31 is fastened to the fastening hole so that the terminals 311 are exposed to the outside. Although not shown in the drawings, each terminal 311 is electrically connected to a power supply means so that electricity is applied.

Since the structure in which the head 31 is fastened so that the upper end is exposed in the fastening hole may be implemented by various known structures, a detailed description thereof will be omitted. However, in this structure, a watertight structure is placed between the exposed head 31 and the fastening hole to prevent the gas from being exposed.

In the heating rod 3, the body 32 has a heating wire 321-1 embedded therein, and the heating part 321 and the heating part 321 embedded in the incineration part 21 are collected in the upper part. It is characterized in that it is composed of a non-heating part 322 that is embedded in the part 22 .

That is, the heating wire 321-1 is embedded only in the heating part 321, and the heating wire 321-1 is only embedded in the non-heating part 321 so that only the wire 322-1 for electrical connection with an external power source is embedded. This is so that heat is generated only in the portion 321 .

The reason for this configuration is that the heating unit 321 generates heat in the incineration unit 21 containing the inlet gas to incinerate the inlet gas, and the incinerated process gas is collected by the collecting unit 22. The gas collected in the collecting unit 22 is a high-temperature gas, and in particular, if the high-temperature and high-humidity gas flows directly into the heat exchanger 170, as mentioned above, when the moisture content is high, the heat exchanger ( 170) is highly likely to cause a load. Accordingly, in the present invention, the non-heating unit 322 is embedded in the collecting unit 22 to remove moisture mixed with contaminants from the high-temperature and high-humidity gas in the non-heating unit 322 . For this purpose, it is reasonable that the heating unit 321, the non-heating unit 322, and the head 31 are made of an aluminum material having high thermal conductivity.

That is, the heating rod 3 functions as a heating means in the incineration part 21 and functions as a moisture removal means in the collecting part 22 .

Accordingly, an embodiment for further doubling the function of the non-heating unit 322 as a moisture removal means is shown in FIG. 4 .

In this embodiment, the heating part 321 and the non-heating part 322 are made of a heat-insulating material, a space 711 is formed therein, and a connection hole 712 for electrical connection with the heating wire 321-1 is provided. Connected by a heat-blocking connector 7 including fastening rims 72 and 73 fastened to the heating part 321 and the non-heating part 322 on both sides of the configured connection body 71 and the connection body 71, respectively. is characterized by

That is, the heat transfer between the heating part 321 and the non-heating part 322 is controlled by the configuration of the heat blocking connector 7 .

To this end, first of all, the heat-blocking connector 7 is preferably made of a heat-blocking material as various known materials. Here, the heat-blocking material uses a material having a relatively low thermal conductivity, so that the heating part 321 and the non-heating part 322 as the material itself. To each other, heat transfer is controlled.

In addition, structurally, the space 711 is formed in the connection body 71 where the heating part 321 and the non-heating part 322 are in contact with each other to form a mutual heat blocking structure.

As shown in the drawing, the fastening rims 72 and 73 protruding from both sides of the connection body 71 are inserted into the heating part 321 and the non-heating part 322, respectively, so that they are heated by the heat blocking connector 7 The part 321 and the non-heating part 322 are interconnected.

The bulkhead 23 is such that the gas (g) that has undergone the incineration process in the incineration unit 21 flows upward and is collected by the collecting unit 22 through the bulkhead 23. The bulkhead 23 is As shown in FIG. 2 , a plurality of filter media 233 is filled between the mesh networks 232 forming the upper and lower separations to filter foreign substances from the gas g, and the collecting unit 22 collects the process gas. to make this happen. As mentioned above, there are cases where contaminants are mixed into the gas (g) that has undergone the incineration process. When these contaminants are introduced into the heat exchanger 170, a load is caused on the heat exchanger 170 or the heat exchanger 170 ) through which the gas mixed with contaminants can be discharged as it is, so that filtration is performed through the partition wall 23 .

Here, as the filter medium 233, activated carbon or the like may be used.

Although not shown in the drawings, it is preferable that the partition wall 23 in the housing 2 is configured to be detachable to facilitate cleaning or replacement when the partition wall 23 is blocked.

As shown in FIG. 5 , a through hole 231 opposite to the fastening hole is formed in the partition wall 23 to allow the body 32 to pass therethrough.

However, as mentioned above, although the heating part 321 and the non-heating part 322 are configured to block heat, the moisture mixed in the gas (g) is condensed in the non-heating part 322 to be condensed water (w). In order to control problems such as white smoke generation by lowering the absolute humidity from the gas (g) by the generation of such condensed water (w), the problem is that such condensed water (w) rides the non-heating unit 322 and falls down through the hole ( 231 ) or when transmitted to the heating unit 321 through the gap between the barrier ribs 23 , there is a problem in that the heating efficiency of the heating unit 321 is reduced.

Accordingly, in the present embodiment, at the position where the through hole 231 is formed, the second through hole 61 through which the non-heating part 322 passes in the body 32 opposite to the through hole 231 in the central part; The condensed water storage device 62 is included in the rim recess 62 so that the condensed water droplets are induced and stored in the non-heating part 322 so that the cross section is formed in a concave shape in connection with the second through hole 61. to solve the above problems.

As shown in the drawing, the condensed water storage device 62 is configured on the upper part of the partition wall 23, and the condensed water formed on the outer periphery of the non-heating part 322 falls and is guided to the edge recess 62 and stored. By blocking the transfer of water to the heating unit 321 located at the bottom, the thermal efficiency is prevented from being lowered, and the condensed water, which may contain a large amount of contaminants, is re-introduced into the lower gas to lower the incineration efficiency. to prevent it from happening.

The condensed water stored in the edge recess 62 by the operation mechanism as described above is to be treated by opening the housing 2 after incineration is finished.

Meanwhile, in the present invention, an example is provided in which the oil tank 150 is filled with activated carbon whose surface is modified with polyvinyl pyrrolidone-vinyl acetate copolymer (PVP-VA). Activated carbon whose surface is modified with polyvinyl pyrrolidone vinyl acetate copolymer (PVP-VA) may be filled in the oil tank 150 or configured to form a separate filtration layer.

Activated carbon surface-modified with PVP-VA is coated with PVP-VA on the activated carbon to increase the adsorption rate of volatile organic compounds such as TCE with hydrophobicity. Activated carbon whose surface is modified with polyvinyl pyrrolidone-vinyl acetate copolymer (PVP-VA) is obtained by immersing activated carbon in a PVP-VA solution in which PVP-VA is mixed and dissolved in DDIW.

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 should not be limited to the content described in the detailed description of the specification, but should be defined by the claims.

100: system of the present invention 110: condenser
120: gas-liquid separator 130, 1: incinerator
140: oil-water separator 150: oil tank
160: water treatment device 170: heat exchanger

Claims (8)

a first module comprising: a condenser into which polluted gas generated by geothermal desorption is introduced and liquefied; and a gas-liquid separator through which gas-liquid separation is achieved by introducing liquefied polluting gas from the condenser;
a second module comprising: an incinerator in which the gas separated from the gas-liquid separator is introduced and heat-treated; and a heat exchanger configured to discharge the treated gas generated from the incinerator after heat exchange;
An oil-water separator that receives the liquid separated from the gas-liquid separator to separate oil and moisture, an oil tank that receives and stores oil from the oil-water separator, and receives moisture from the oil-water separator to remove contaminants from the moisture a third module including a water treatment device;
A modular geothermal desorption post-treatment system comprising a.
The method of claim 1,
The water treatment device is a modular geothermal desorption post-treatment system, characterized in that it includes a coagulation tank, a sedimentation tank, a sludge filter, and a filtration tank.
The method of claim 1,
The incinerator is
a housing including an inlet line through which the gas separated from the gas-liquid separator is introduced at a lower end and an outlet line through which the incinerated treated gas is discharged to the heat exchanger at the upper end; A modular geothermal desorption post-treatment system comprising a; a plurality of heating rods configured to be detachably attached to the housing and to apply heat to the introduced gas.
4. The method of claim 3,
The housing is partitioned by a partition wall filled with filter media, an incineration unit for heat-treating gas is configured at the lower portion, a collecting unit for collecting processing gas generated through heat treatment is configured at the upper portion, and a fastening hole for fastening the heating rod is formed on the upper surface Modular geothermal desorption post-treatment system with
5. The method of claim 4,
The heating rod includes a head that is fastened to the fastening hole and has a terminal exposed to enable electrical connection with an external power source, and a body in which a heating wire is embedded in the lower part of the head to generate heat, and the body has a heating wire embedded therein. Modular geothermal desorption post-processing system, characterized in that it consists of a heating part inserted into the incineration part and a non-heating part embedded in the collecting part on the upper part of the heating part.
6. The method of claim 5,
The heating part and the non-heating part are made of a heat-blocking material, a space is formed therein, and a connecting body having a long hole for electrical connection with a hot wire, and a fastening border fastened to the heating part and the non-heating part at both ends of the connecting body, respectively A modular geothermal desorption post-treatment system, characterized in that it is connected by a heat blocking connector comprising a.
6. The method of claim 5,
A through hole opposite to the fastening hole is formed in the partition wall so that the body passes through,
At the position where the through hole is formed, a second through hole in the body through which the non-heating part passes in the central portion opposite the through hole is formed in a concave shape in connection with the second through hole, so that the water droplets condensed in the non-heating part Modular geothermal desorption post-treatment system, characterized in that it includes a condensed water storage device composed of a rim groove to be stored.
The method of claim 1,
A modular geothermal desorption post-treatment system, characterized in that the oil tank is filled with activated carbon whose surface is modified with polyvinyl pyrrolidone vinyl acetate copolymer (PVP-VA).

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