KR100807772B1 - Decontaminater and decontamination method for the polluted soil by oil - Google Patents

Abstract

An apparatus and a method for purifying oil-polluted soil are provided to volatilize oil from the soil by heating the oil-polluted soil, and remove harmful materials from the volatilized oil by reheating the volatilized oil at an ultra-high temperature, thereby preventing secondary environmental pollution. A soil input port(110) inputs oil-polluted soil into a heating case(120) therethrough. The heating case is connected to the soil input port, wherein the heating case has heating facilities for heating the soil. A discharge passage(130) is connected to the heating case to discharge the oil volatilized from the heating case. A connection passage(160) moves all of the soil discharged from the heating case. A cooling case(170) is connected to the connection passage, wherein the cooling case has cooling facilities for cooling the soil. A soil discharge port(140) is connected to the cooling case to discharge the soil within the cooling case therethrough. Further, a conveyor is additionally contained in order to transfer soil discharged to the soil input port.

Description

Decontaminater and Decontamination method for the polluted soil by oil}

1 is a schematic diagram of an oil pollution soil purifying apparatus according to the present invention.

2 is an enlarged perspective view of main parts of the heating vessel.

3 is an enlarged cross-sectional view of the main portion of the flue gas furnace.

4 is an enlarged perspective view of main parts of the cooling cylinder.

Figure 5 is a flow chart of the oil pollution soil purification method according to the present invention.

Figure 6 is a comparison table of the conventional oil pollution soil purification method and the oil pollution soil purification method according to the present invention.

7 is a graph comparing the purification effect of oil polluted soil according to heating temperature.

<Description of the symbols for the main parts of the drawings>

100: oil pollution soil purification device 110: inlet

120: heating cylinder 120a: outer cylinder (heating cylinder)

120b: inner cylinder (heating barrel) 121: heating device (heating barrel)

122: earth and sand guide (heating) 130: flue gas furnace

131: heating device (fuel furnace) 140: soil discharge outlet

150: conveyor 160: connection

170: cooling cylinder 171: spraying device (cooling cylinder)

172: earth and sand guide blade (cooling cylinder) 180: drive motor

190: Motor connection rotary tooth 191: Rotary tooth (heating tube)

192: cogwheel (cooling bin)

The present invention relates to an apparatus and a method for restoring soil contaminated with oil, and more particularly, by heating the soil contaminated with oil to volatilize and remove oil from the soil, the volatilized oil is reheated to an extremely high temperature. The present invention relates to an oil pollution purification device and an oil pollution purification method that prevent secondary pollution by separating and removing harmful substances.

As industrialization and urbanization are rapidly progressing recently, the consumption of petroleum increases exponentially, which causes serious environmental pollution problems in the refining, transportation, storage and consumption phases of petroleum.

In particular, soil contamination by oil is mainly caused by oil leaks from gas stations, reservoirs, and oil storage facilities such as military facilities, aging and accidents of related industries such as petrochemical plants, and illegal landfilling of oil. Once the soil is contaminated with oil, it is very expensive and time consuming to clean it up and restore it. If the soil contaminated with oil is left unusable, pollution will spread to groundwater and nearby rivers, which will adversely affect the ecosystem, so purification and restoration of contaminated soil is an important issue.

Therefore, various attempts have been made to restore and regenerate soil contaminated with oil. Conventional restoration methods for oil polluted soils include a biological method of decomposing and removing oil using microorganisms, which are petroleum hydrocarbon decomposition strains, Oil contaminated earth and sand with high pressure water has been developed and used a lot of techniques for washing the oil attached to the earth and sand.

However, the biological method is that the growth of microorganisms, which are degradation strains of hydrocarbons, is greatly influenced by the environment. In particular, since the temperature is affected by a lot of temperature, the decomposition and purification of oils is stopped during the winter season, and the restoration of the soil for several years. There is a problem that it takes a long time of the unit, the method using the water has a problem that the cost of removing the oil is somewhat cheaper and less time, while a separate cost for treating the washed water have.

The present invention created to solve the above problems, first, can be appropriately applied according to the soil, soil state of soil contaminated with oil, and second, can be applied universally regardless of the type of oil, Third, an object of the present invention is to provide an oil polluted soil purification apparatus and an oil polluted soil purification method that can prevent secondary pollution such as air pollution or water pollution due to substances generated during the purification of polluted soil.

The present invention is a device for purifying soil contaminated with oil discharged from oil storage facilities, such as gas stations, reservoirs, military facilities, etc., a soil inlet for injecting soil contaminated with oil; A heating tube connected to the soil inlet and provided with a heating facility for the inlet; A flue gas furnace connected to the heating tube to discharge oil volatilized from the heating tube; A connection passage in which all of the earth and sand discharged from the heating vessel is moved; A cooling tube connected to the connection path and having a cooling facility for the inflowed soil; And a soil discharge outlet connected to the cooling cylinder and discharging soil of the cooling cylinder. It provides an oil polluted soil purifier, characterized in that configured to include.

In addition, the present invention is a method for purifying soil contaminated with oil discharged from oil storage facilities such as gas stations, reservoirs, military facilities, etc. using the oil polluted soil purifier, (a) to remove foreign substances from soil contaminated with oil Separating and crushing the soil to an appropriate particle size; (b) injecting the crushed soil into the heating vessel of the oil polluted soil purifier and heating to volatilize the oil; And (c) injecting the earth or sand from which the oil is removed into a cooling tank of the oil pollution earth and sand purifying apparatus, and spraying a predetermined amount of cooling water to suppress dust generation and discharge. It provides an oil pollution soil purification method comprising a.

1 is a schematic diagram of an oil pollution soil purifying apparatus according to the present invention. 2 is an enlarged perspective view of main parts of the heating vessel. 3 is an enlarged cross-sectional view of the main portion of the flue gas furnace. 4 is an enlarged perspective view of main parts of the cooling cylinder. Figure 5 is a flow chart of the oil pollution soil purification method according to the present invention. Figure 6 is a comparison table of the conventional oil pollution soil purification method and the oil pollution soil purification method according to the present invention. Hereinafter, the present invention will be described in more detail with reference to the drawings.

One. Oil pollution soil  Purifier

Oil pollution soil purifying apparatus according to the present invention, as shown in Figure 1, the soil inlet 110, the heating tube 120, the flue gas furnace 130, the connection path 160, the cooling tube 170 and the soil outlet ( 140).

The soil inlet 110 is an inlet for injecting soil contaminated with oil into a heating vessel to be described later. In order to effectively inject soil, it is desirable to produce a funnel wide top.

The heating cylinder 120 is a device for separating the oil from the soil by heating the introduced soil. The heating temperature is about 250 ℃ suitable for this will be described later. The heating cylinder 120 may be disposed vertically so that the introduced soil may flow out to the bottom. However, in order to purify the introduced soil, it should be able to stay in the heating vessel 120 maintained at 250 ° C. for about 5 minutes or more, so that the soil can be slowly discharged by arranging the heating vessel 120 horizontally. It is desirable to take the configuration. In such a method, when the helical soil guide blades 122 are formed on the inner circumferential surface of the heating tube 120, the earth and sand introduced into the soil injection hole 110 through the axial rotation of the heating tube 120 may be used. It is transferred to the other side along the wing 122. The earth and sand guide blades 122 is configured to be transported a certain amount of soil, but if necessary to be able to adjust the amount of soil transport. To this end, in some cases, it is also possible to tilt the heating vessel 120 at an inclination of about 5 to 10 degrees, thereby extending or shortening the soil retention time in the heating vessel 120.

On the other hand, there is a risk that the soil is carbonized when the introduced soil is directly heated, as shown in Figure 2, the heating cylinder 120 is divided into an outer cylinder (120a) and the inner cylinder (120b), the sediment inlet 110 Soil is introduced into the inner cylinder (120b), the heating device 121 is mounted to the outer cylinder (120a), and heating the inner cylinder (120b) in the outer cylinder (120a) in the inner cylinder (120b) It is desirable to have a configuration that allows the soil to be heated indirectly. Therefore, the inner cylinder 120b should be made of a metal material having high thermal conductivity. Of course, in order to transport the soil in the interior of the horizontally arranged heating tubs, the spiral soil guide vanes 122 should be mounted on the inner circumferential surface of the inner cylinder 120b.

The flue gas furnace 130 is connected to the heating cylinder 120, it is a flue gas facility for discharging the oil volatilized from the heating cylinder (120). The part where the flue gas passage 130 is connected in the heating tube 120 is not particularly limited, but is preferably connected at the opposite side of the soil inlet 110. However, when the volatilized oil is directly discharged into the atmosphere, air pollution (secondary pollution) may occur due to harmful substances such as heavy metals, sulfur oxides and nitrogen oxides contained in the volatilized oil. In order to prevent such secondary pollution, the flue gas furnace 130 is also provided with a heating device 131, so that the flue gas furnace 130 is not merely used as a passage through which the volatilized oil is discharged, and separates and removes harmful substances. It can have a function to do it. Hazardous substances are separated from the ultra-high heat of 1000 ℃ or more because the flue gas furnace 130 has to take a structure that can receive as much heat as the oil flows into the flue gas furnace so that there are a lot of heating parts as shown in FIG. It is advantageous to construct the winding 130 and to mount the heating device 131 along the winding flue gas furnace 130. On the other hand, if the air fan is mounted on the top end of the exhaust path 130 may be forced to exhaust.

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On the other hand, the earth and sand purified in the heating tube 120 is heated and dried at a high temperature, so when directly discharged from the heating tube 120 to the outside can be easily blown by the wind, there is a high risk of dust and the like. In this regard, all of the soil discharged from the heating pipe 120 is connected to the connection path 160 and the connection path 160 to move, and further provided with a cooling tube 170 having a cooling facility for the inlet soil introduced. It is configured to include, the soil discharge outlet 140 is connected to the cooling cylinder 170, the above problems by using the oil pollution soil cleaning device, characterized in that configured to discharge the cooled soil in the cooling cylinder 170. Can be solved.

The connection path 160 serves to connect the heating cylinder 120 and the cooling cylinder 170 so that the heated and purified soil in the heating cylinder 120 flows into the cooling cylinder 170.

The cooling cylinder 170 serves to discharge and then cool the introduced earth and sand, it is easy to install a spray device 171 as a cooling facility to spray a predetermined amount of cooling water. The arrangement method of the cooling cylinder 170 is also arranged horizontally, as in the heating cylinder 120, it is preferable to allow the soil to flow into the cooling cylinder 170 is sufficiently cooled and discharged. Thus, as shown in Figure 4 is configured to form a spiral soil guide blade 172 on the inner peripheral surface of the cooling cylinder 170, the connection path 160 through the axial rotation of the cooling cylinder 170 The injected earth and sand can be configured to be transferred to the other side along the earth and sand guide 172.

However, for efficient space utilization, it is preferable to arrange the heating cylinder 120 and the cooling cylinder 170 arranged horizontally as shown in FIG. In order to rotate the heating cylinder 120 and the cooling cylinder 170 in the axial direction, the drive motor 180 is installed, and the rotary teeth 190 connected to the motor and the rotary teeth 191 and 192 respectively installed in the heating cylinder and the cooling cylinder. ) By appropriately disposing the heating cylinder 120 and the cooling cylinder 170 in the rotational direction of the soil can be the opposite direction of movement. In addition, if the cooling cylinder 170 is also configured to be inclined at an inclination of about 5 to 10 degrees so as to adjust the transport amount of the earth and sand, it is possible to extend or shorten the soil retention time in the cooling cylinder 120. The earth and sand cooled in the cooling cylinder 170 is discharged through the earth and sand outlet 140 connected to the cooling cylinder 170, and at this time, the conveyor 150 for transporting the soil is installed at the position where the earth and sand is discharged. It can be configured to automatically transport the removed soil to a point.

While the above has been shown and described in connection with a specific embodiment of the oil polluted soil purifying apparatus according to the present invention, various modifications and changes can be made without departing from the spirit and scope of the invention represented by the claims. Anyone with ordinary knowledge in Esau will readily know.

2. Oil pollution soil  Purification Method

Oil polluted soil purifying method according to the present invention comprises the steps of (a) separating the foreign matter from the oil contaminated soil and crushing to an appropriate particle size (b) heating the oil contaminated soil to volatilize the oil and (c) the soil is removed Cooling to suppress dust generation and to discharge (see Figure 5).

 The step (a) is to separate the foreign matter from the soil contaminated with oil, and to crush the soil to an appropriate particle size, before the oil-contaminated soil is injected into the oil-contaminated soil purifier 100, a vibration screen, a blower, The foreign matter is first separated by a magnetic separator and the like, and the crushed oil is easily crushed to a size that can be easily processed by the oil purification equipment. At this stage, various foreign matters that can be visually identified are removed.

Step (b) is a step of volatilizing oil by inputting and heating the earth and sand passed through step (a) to the heating vessel 120 of the oil polluted soil purification apparatus 100. Step (b) is a core process of the present invention, in which a fundamental difference occurs with the conventional oil-contaminated soil purification method. The table of FIG. 6 shows the effects, treatment time, and installation cost of the present invention and the conventional oil-contaminated soil purification method. When the present invention has been examined by various criteria, it is suggested that the treatment method through heating according to the present invention is the best method. In addition, the graph of Figure 7 presented the treatment effect according to the heating temperature for kerosene and light oil, it can be seen that the purification effect increases with the temperature generally, but it can be seen that a sufficiently good purification effect even at about 250 ℃.

On the other hand, the oil volatilized by the heating in the heating pipe 120 is guided to the flue gas furnace 130 is provided with a heating device 131 of the oil polluted soil purifier 100 according to the present invention and then reheated the oil The method may further include a process of separating and removing harmful substances such as heavy metals, sulfur oxides, and nitrogen oxides contained therein, thereby preventing secondary air pollution generated by the oil pollution soil purification method.

Step (c) is a step of discharging the soil is removed oil. However, in order to suppress dust generated when hot soil is discharged as it is, the soil is injected into the cooling container 170 equipped with the spraying device 171 and sprayed with a predetermined amount of coolant to discharge the soil. It is preferable to further include a step of suppressing dust generation.

The oil polluted soil purifying apparatus and the oil polluted soil purifying method of the present invention as described above have the following advantageous effects.

First, it is possible to clean the soil contaminated by oil (가열) through heating can be recycled to high quality soil after purification.

Second, since the oil volatilized by heating is discharged after incineration to remove harmful substances by reheating it to a high temperature instead of simply discharging it to the atmosphere, it is possible to fundamentally prevent secondary pollution such as air and water pollution.

Third, it is possible to prevent the dust due to the soil discharge by cooling before discharged purified soil.

Fourth, it can be applied irrespective of the type of oil, the area occupied by the oil polluted soil purifier is not large, and the processing time is short.

Claims (12)

As a device for purifying soil contaminated with oil discharged from oil storage facilities such as gas stations, reservoirs, and military facilities, A soil inlet for introducing soil contaminated with oil; A heating tube connected to the soil inlet and provided with a heating facility for the inlet; A flue gas furnace connected to the heating tube to discharge oil volatilized from the heating tube; A connection passage in which all of the earth and sand discharged from the heating vessel is moved; A cooling tube connected to the connection path and having a cooling facility for the inflowed soil; And A soil discharge outlet connected to the cooling cylinder and discharging soil of the cooling cylinder; Oil polluted soil purification apparatus characterized in that it comprises a. The method of claim 1, wherein the heating vessel, An outer cylinder having a heating device; And An inner cylinder connected to the soil injection hole, rotating in an axial direction, and having a spiral soil guide blade formed on an inner circumferential surface thereof; Oil polluted soil purifier, characterized in that consisting of. In claim 1, A conveyor for transporting the earth and sand discharged to the earth and sand outlet; Oil pollution soil purification apparatus characterized in that the configuration further comprises. The method of claim 1, wherein the flue gas furnace, Oil pollution soil purifier characterized in that the heating device is provided for separating and removing the harmful substances contained in the volatilized oil. In claim 4, The flue gas furnace is meanderingly configured, the oil pollution soil purifier characterized in that the heating device is provided along the flue furnace. In claim 5, An air fan for forced exhaust at the top of the flue gas furnace; Oil pollution soil purification apparatus further comprises a. delete The cooling tube of any one of claims 1 to 6, Cooling water spraying device is provided, rotates in the axial direction, oil pollution soil cleaning equipment, characterized in that the spiral soil guide blades formed on the inner peripheral surface. In claim 8, The heating and cooling barrels are oil polluted soil purification apparatus, characterized in that configured to adjust the slope of the soil discharge direction.  A method of purifying soil contaminated with oil discharged from an oil storage facility such as a gas station, a reservoir, a military facility, etc. by using the oil polluted soil purifier of claim 9, (a) separating foreign matter from the soil contaminated with oil and crushing the soil to an appropriate particle size; (b) injecting the crushed soil into the heating vessel of the oil polluted soil purifier and heating to volatilize the oil; And (c) injecting the earth and sand from which the oil has been removed into a cooling tank of the oil polluted soil cleaning device and spraying a predetermined amount of cooling water to suppress dust generation and discharge; Oil pollution soil purification method comprising a. The method of claim 10, wherein step (b), The oil polluted soil purification method further comprising the step of separating and removing the harmful substances contained in the oil by inducing the volatilized oil to the flue gas of the oil polluted soil purifier. delete

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