JP2006007181A - Soil-heating device, soil purification method, and construction method of soil-heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a means for heating the inside of soil without using a large quantity of external energy to promote the purification of contaminated soil. <P>SOLUTION: A soil-heating device is provided with a heat-collecting means 1 which is arranged on the ground and collects solar heat, an evaporation part 3 which is thermally connected to the heat-collecting means 1, a condensing part 4 which is arranged inside soil, a heat pipe having pipes 18 and 19 for connecting the evaporation part 3 and the condensing part 4, a sensor 21 which detects a temperature of soil around the condensing part 4, and a flow rate control means 20 which controls a flow rate control valve 5 to adjust the transmission of heat to the soil around the condensing part 4 based on the temperature of the soil around the condensing part 4. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a soil heating device, a soil purification method, and a method for laying a soil heating device that promote the purification of soil contamination.

  In recent years, the problem of soil contamination due to organic compounds such as organic halogen compounds and hydrocarbons has become apparent, increasing the number of cases that hinder land operation and distribution. In addition, due to the establishment of the Soil Contamination Prevention Law, land owners and those who cause pollution are obliged to conduct soil contamination surveys when the use of hazardous substance use specific facilities is abolished, and cleanup measures when contamination exceeding the standard is discovered. Therefore, the need for soil purification technology is increasing.

  In response to these trends, in-situ treatment such as soil gas aspiration and bioremediation is possible as a soil purification method that does not require large-scale excavation work and that can be implemented at low cost without stopping the operation of the factory. The method which becomes is attracting particular attention.

  Contaminants that have permeated into the soil can be adsorbed on soil particles or dissolved in groundwater. For this reason, in the case of the soil gas suction method, there is a problem that the removal efficiency by suction decreases as the purification process proceeds and the concentration of contaminants decreases. On the other hand, bioremediation, which is a method of decomposing pollutants using microorganisms, has a problem that the activity of microorganisms decreases at low temperatures in winter, and as a result, the period until purification is completed is prolonged.

  From this point of view, methods have been tried to heat the soil to desorb pollutants from soil particles, volatilize from groundwater and / or activate decomposing microorganisms.

  Conventionally, as a method of purifying contaminated soil by heating the inside of the soil, a heating medium that passes through the pipes arranged on the ground surface of the repaired soil, in particular, the groundwater that has been pumped up, is heated by sunlight to repair the heating medium. There was a method of circulating or introducing into the soil (see, for example, Patent Document 1).

  4 and 5 are schematic views of the soil repairing apparatus disclosed in Patent Document 1. FIG. A pipe 51 for transporting the heat medium is provided on the repaired soil. Reference numeral 52 denotes a mirror that collects solar heat in the pipe 51. The hot water heated by solar heat in this way is sent to the deep soil aquifer by the pump 53.

  In this soil restoration device, groundwater is used as a heat medium. Groundwater pumped up from the aquifer by the pump 55 is sent to the pipe 51, heated by the mirror 52, and again introduced into the aquifer.

  In the case of FIG. 4, the pump 53 and the pump 55 are connected by underground piping so that the hot water introduced into the aquifer by the pump 53 can be reused.

In addition, as a method for purifying contaminated soil by heating the inside of the soil, a method using electric power (for example, refer to Patent Document 2), a method of introducing a high-temperature gas of about 200 ° C., and the like have been proposed.
Japanese Patent No. 3332558 (page 1-6, FIGS. 1 and 2) International Publication No. 93/01010 Pamphlet

  However, in the conventional configuration described above, since sensible heat transport is performed using a liquid, particularly groundwater, as the heat medium, high energy is required for heating the heat medium, and efficient heat transfer to the contaminated soil is required. It had the problem of being difficult.

  In the case of the conventional configuration shown in FIG. 4, a pipe for transporting a heating medium for heating the contaminated soil is laid in the soil, and in order to realize this structure, a large scale of the contaminated soil is required. Excavation was necessary, and the construction cost was greatly increased.

  In the case of the conventional configuration shown in FIG. 5, a large-scale excavation of the soil is not necessary for realizing the structure, but there is a problem that it is impossible to use other than groundwater as a heat medium. It was.

  In addition, in the method of using electric power or high temperature gas for heating, the soil has low thermal conductivity, so the energy required to heat it to the desired temperature becomes very large, and it is a burden both economically and environmentally. Had the problem of becoming larger.

  The present invention solves the above-described conventional problems, and provides a soil heating device, a soil purification method, and a soil heating device laying method that do not require a large amount of external energy and are easy to construct with high efficiency. With the goal.

In order to solve the above-described problem, the first aspect of the present invention provides:
A heat collecting means arranged on the ground and collecting solar heat;
It is a soil heating apparatus provided with the evaporation part thermally connected with the said heat collection means, the condensation part arrange | positioned inside soil, and the heat pipe which has piping which connects the said evaporation part and the said condensation part.

The second aspect of the present invention
Furthermore, a flow rate control valve that is disposed in the pipe and controls the flow rate of the heat medium circulating in the heat pipe;
Temperature detecting means for detecting the temperature of the soil around the condensing part;
A soil heating apparatus according to the first aspect of the present invention, comprising: flow rate control means for controlling the flow rate control valve based on the temperature of the soil around the condensing unit and adjusting the amount of heat transfer to the soil around the condensing unit. It is.

The third aspect of the present invention provides
Furthermore, temperature detection means for detecting the temperature of the soil around the condensation unit,
A heat medium circulation pump disposed in the pipe and moving the heat medium of the condensing unit to the evaporation unit;
The heat medium circulation pump controls the amount of movement of the heat medium moved from the condensing unit to the evaporation unit based on the temperature of the soil around the condensing unit, thereby transferring the heat medium to the soil around the condensing unit. It is the soil heating apparatus of 1st this invention which adjusts calorie | heat amount.

The fourth invention relates to
The heat medium circulation pump is the soil heating apparatus according to the third aspect of the present invention, which is operated by heat supplied from the heat collecting means.

The fifth aspect of the present invention relates to
Furthermore, it is equipped with solar power generation means that is arranged on the ground and generates power with sunlight,
The heat medium circulation pump is the soil heating apparatus according to the third aspect of the present invention, which is operated by electric power supplied from the solar power generation means.

The sixth invention relates to
The pipe has a steam pipe in which a heat medium moves from the evaporation section to the condensation section, and a liquid pipe in which a heat medium moves from the condensation section to the evaporation section,
The said steam pipe and the said liquid pipe | tube are the soil heating apparatuses of 1st this invention enclosed with the heat insulating material.

The seventh invention relates to
Furthermore, it is the soil heating apparatus of 6th this invention provided with the protective pipe by which the said steam pipe and the said liquid pipe are arrange | positioned inside.

The eighth invention relates to
And a supply pipe for supplying a substance that promotes the degradation of the soil contamination compound and / or a microorganism having a resolution of the soil contamination compound,
The supply pipe is the soil heating device according to the seventh aspect of the present invention, which is disposed inside the protective pipe together with the steam pipe and the liquid pipe.

The ninth invention relates to
The soil heating apparatus according to the eighth aspect of the present invention activates the microorganisms supplied into the soil when the soil is heated.

The tenth aspect of the present invention is
Furthermore, a soil gas suction pipe for sucking soil gas is provided,
The soil gas suction pipe is disposed inside the protective pipe together with the steam pipe and the liquid pipe, and sucks soil gas in the soil containing contaminants when heating the soil. 7 is a soil heating apparatus according to the present invention.

The eleventh aspect of the present invention is
The evaporating part of a heat pipe having an evaporating part thermally connected to a heat collecting means for collecting solar heat, a condensing part arranged in the soil, and a pipe connecting the evaporating part and the condensing part. Heating by solar heat collection, evaporating the heat medium inside the evaporation section;
The vaporized heating medium moves from the evaporation section to the condensation section;
A step of heating the soil around the condensing unit by condensing the heat medium that has moved to the condensing unit, and purifying the soil contaminated with a chemical substance.

The twelfth aspect of the present invention is
In the laying method of the soil heating device of the seventh invention,
Drilling a borehole from the ground to reach the part contaminated by chemicals inside the soil;
Storing the steam pipe and the liquid pipe in the protective pipe;
A method of laying a soil heating apparatus, comprising: driving the protective pipe containing the steam pipe and the liquid pipe into the borehole.

The thirteenth aspect of the present invention is
The soil heating device of the second aspect of the present invention functions as a flow rate control means for controlling the flow rate control valve based on the temperature of the soil around the condensation unit and adjusting the amount of heat transfer to the soil around the condensation unit. It is a program to make it.

The fourteenth aspect of the present invention is
A recording medium carrying a program according to the thirteenth aspect of the present invention, which can be used by a computer.

  According to the present invention, it is possible to provide a soil heating apparatus, a soil purification method, and a soil heating apparatus laying method that do not require large external energy input and that are highly efficient and easy to construct.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 is a diagram showing a concept of soil purification using a soil heating device in Embodiment 1 of the present invention.

  The soil heating apparatus of the first embodiment includes a heat collecting means 1 and a heat pipe 2 in which a heat medium is enclosed. The heat pipe 2 includes an evaporation unit 3 disposed inside the heat collecting means 1, a condensing unit 4 disposed inside the soil, a liquid pipe 18 and a steam pipe 19 connecting the evaporation unit 3 and the condensing unit 4. It has a pipe of books. The liquid pipe 18 and the steam pipe 19 are surrounded by the heat insulating material 6, and these are accommodated in the protective pipe 7. The liquid pipe 18 and the steam pipe 19 are an example of piping connecting the evaporation section and the condensation section of the present invention.

  A flow rate control valve 5 for controlling the flow rate of the heat medium flowing through the liquid pipe 18 is provided on the liquid pipe 18. A temperature sensor 21 that detects the temperature of the soil around the condensing unit 4 is installed together with the condensing unit 4. And the flow control means 20 which adjusts the flow volume of the heat medium which distribute | circulates the liquid pipe 18 by controlling the flow control valve 5 based on the temperature of the soil around the condensation part 4 is provided. The temperature sensor 21 is an example of the temperature detection means of the present invention.

  As the heat medium used in the soil heating apparatus of the first embodiment, one that condenses in the pressure / temperature range used can be used, such as halogen-substituted hydrocarbons such as Freon, hydrocarbons such as propane, butane, and isobutane, Water, alcohol, ammonia or the like can be used.

  Next, operation | movement of the soil heating apparatus of this Embodiment 1 is demonstrated.

  The heat collecting means 1 is means for collecting solar heat and transmitting heat required for evaporation of the heat medium to the heat pipe 2. Specifically, although a mirror, a heat collecting fin, etc. can be considered, naturally it is not limited to these. In order to transfer heat to the heat pipe 2 with as little loss as possible, the heat collecting means 1 is integrated with the evaporation section 3 of the heat pipe 2, and solar heat is collected in the evaporation section 3 of the heat pipe 2. In the configuration of FIG. 1, the heat collecting means 1 is installed parallel to the ground surface. However, the heat collecting means 1 may be installed perpendicular to the ground surface or arranged at an inclination angle with respect to the ground surface. There is no problem.

  The heat pipe 2 has a function of transferring heat from the evaporation unit 3 connected to the high-temperature heat collecting means 1 to the condensing unit 4 disposed inside the soil, thereby heating the soil around the condensing unit 4. . By using the heat pipe 2 as a heating means for the contaminated soil, it becomes possible to use the latent heat of the heat medium enclosed in the heat transfer to the contaminated soil, compared with the conventional heat transfer using only sensible heat. Thus, the contaminated soil can be heated more efficiently.

  The heat pipe 2 constituting the soil heating apparatus according to the first embodiment needs to be able to operate in a so-called top heat state in which the evaporation unit 3 is located above. In the configuration of FIG. 1, in order to realize the operation in the top heat state, the heat pipe 2 is a loop type in which the evaporation unit 3 and the condensation unit 4 are connected by two pipes of a liquid pipe 18 and a steam pipe 19. However, any configuration other than the loop type may be used as long as it can operate in a top heat state such as a structure in which a wick is formed inside the heat pipe.

  In the heat pipe 2, it is desirable that the tube diameter be as small as possible in order to effectively generate a capillary force that moves the heat medium that has become a liquid phase in the condensing unit 4 to the evaporation unit 3. On the other hand, when using a heat pipe with a small pipe diameter, the probability of deformation or breakage increases due to pressure in construction or in the soil, resulting in a problem that workability is not good. Therefore, by taking a structure in which a part or the whole of the pipe portion of the heat pipe is accommodated in the protective pipe 7 having at least an inner diameter larger than the outer diameter of the heat pipe, such deformation and breakage can be prevented, and workability can be improved. Improvements can be made possible.

  In particular, when using the loop heat pipe 2 as shown in FIG. 1 in which the condensing unit 4 and the evaporation unit 3 are connected by two thin tubes, a steam pipe 19 and a liquid pipe 18 through which steam and liquid pass, respectively, Large-scale and complicated excavation by adopting a construction method in which the pipe 19 and the liquid pipe 18 are accommodated in one protective pipe 7 and the heat pipe 2 is driven together with the protective pipe 7 into a boring hole drilled toward the contaminated soil. It becomes possible to install the heat pipe 2 without performing the process, and the workability can be greatly improved.

  Further, the protective tube 7 can be expected to have an effect of preventing the corrosion of the heat pipe 2 due to a corrosive substance in the groundwater or soil, so that the life of the soil heating device can be extended. Moreover, the heat insulation effect with respect to non-contaminated soil can be improved more by installing the heat insulating material 6 in the inside or the outer wall of the protective tube 7, or comprising the protective tube 7 itself with a highly heat-insulating material. It becomes possible to implement soil remediation measures with high efficiency.

  As the material of the protective tube 7, a material having a certain degree of strength and strong against corrosion, such as stainless steel, cast iron, concrete, resin system (PE, PP, PVC, etc.) can be used. In addition, concrete or resin-based material can be used as a highly heat-insulating material.

  The flow rate control valve 5 has an action of controlling the flow rate of the heat medium inside the heat pipe 2. By the action of the flow control valve 5, the soil temperature range suitable for the purification of contaminated soil is maintained. The flow control valve 5 is controlled by the flow control means 20 based on the temperature of the soil around the condensing unit 4 detected by the temperature sensor 21. When the temperature detected by the temperature sensor 21 is higher than a predetermined temperature set in advance, the flow rate of the heat medium flowing through the liquid pipe 18 is small in order to lower the temperature of the soil around the condensing unit 4. The flow control valve 5 is controlled so that

  It is considered that the heat collecting means 1 and the evaporation part 3 of the heat pipe 2 rise to about 90 degrees Celsius at the maximum by collecting solar heat. On the other hand, when soil purification by bioremediation is carried out, if the temperature in the soil rises to 50 degrees Celsius or more, many microorganisms in the soil will be killed, and as a result, the progress of degradation of pollutants may be significantly delayed. is there. In this case, the flow control means 20 controls the flow control valve 5 so that the temperature in the soil does not exceed 50 degrees Celsius.

  In addition, in bioremediation and other soil purification methods, when oxygen and / or flammable gas such as hydrogen or methane is introduced into the soil, there is a risk of ignition due to overheating if high temperature heat transfer is performed. . Even in such a case, by restricting the flow rate of the heat medium inside the heat pipe 2 by the flow rate control valve 5, it is possible to suppress excessive heat transfer and to avoid adverse effects due to overheating of the contaminated soil.

  In bioremediation, when the optimum temperature of microorganisms contributing to purification is known in advance, temperature information near the contaminated soil is acquired by the temperature sensor 21, and the flow rate control valve 5 is automatically controlled by feeding back the temperature information. You may make it make it.

  In FIG. 1, the flow rate control means 20 is configured to arrange the wiring for obtaining temperature information from the temperature sensor 21 outside the protective tube 7, but this wiring is passed through the inside of the protective tube 7. It may be configured.

  The heat insulating material 6 has the effect | action which reduces the heat loss from parts other than the condensation part 4 which heats contaminated soil in the heat pipe 2. As shown in FIG. The depth of distribution of contaminating compounds in the soil may reach several tens of meters, especially in the case of organohalogen compounds with high specific gravity and low viscosity, from near the surface. From the viewpoint of preventing unnecessary heat transfer to the non-contaminated soil existing above the contaminated soil and efficiently performing the heating in the vicinity of the contaminated soil, the heat pipe 2 constituting the first embodiment is applied to the non-contaminated soil. It is preferable to attach a heat insulating material to the contacting part. As the heat insulating material, plastic heat insulating materials such as urethane foam and polystyrene foam, glass wool, ceramic fiber, and the like can be used, but it is naturally not limited thereto.

  Regarding bioremediation that utilizes the degradation of pollutants by microorganisms, the problem is that the soil temperature in winter is lower than the temperature range where microorganisms are actively active, resulting in a decrease in the purification rate, resulting in a longer purification period. Has been pointed out in the past. By using the soil heating apparatus of the first embodiment and selectively heating the vicinity of the contaminated soil, it becomes possible to activate the activities of microorganisms that contribute to bioremediation. In general, when the temperature of the soil is raised by 1 ° C. within the range in which the protein constituting the microorganism does not denature, the activity of the microorganism is supposed to be improved several times, and the contaminated soil can be effectively purified. .

  In addition, the kind of microorganisms activated by heating the soil is not particularly limited, and may be an indigenous microorganism already existing in the contaminated soil or a microorganism introduced from the outside.

  Along with bioremediation, the soil gas suction method, which is a representative technique for in-situ soil purification, is a method for forcibly sucking contaminants in soil, especially volatile organic compounds, and collecting and purifying gas on the ground. However, in the low temperature season of winter, the volatility of pollutants is reduced, and the viscosity is improved and the adsorptive power to the soil is increased. In the soil heating apparatus according to the first embodiment, by heating the contaminated soil, it is possible to improve the volatility of the pollutant and improve the suction efficiency of the volatile gas.

  When the area of the contaminated soil is large, the purification can be carried out more effectively by installing a plurality of soil heating devices of the present invention. The installation interval is appropriately determined according to various characteristics such as the thermal conductivity of the target soil, the target heating temperature corresponding to the purification method, and the like.

  From the above effects, the soil heating apparatus of the first embodiment can achieve complete purification of contaminated soil in a short construction period and with an easy construction method.

(Embodiment 2)
FIG. 2 is a diagram showing a concept of soil purification using a soil heating device in Embodiment 2 of the present invention. The same reference numerals are used for the same components as in FIG.

  The soil heating apparatus according to the second embodiment includes a heat collecting means 1 and a heat pipe 2 in which a heat medium is enclosed. The heat pipe 2 has the same configuration as that of the first embodiment shown in FIG. A heat medium pump 10 for circulating a heat medium from the condensing unit 4 to the evaporation unit 3 is provided in the liquid pipe 18. The heat medium pump 10 is an example of the heat medium circulation pump of the present invention.

  The heat medium pump 10 controls the flow rate of the heat medium in the liquid pipe 18 based on the temperature of the soil around the condensing unit 4 from the temperature sensor 21. In addition, electricity generated by the solar power generation device 8 is stored in the power storage device 9, and the heat medium pump 10 is operated using the power of the power storage device 9. The temperature sensor 21 is an example of the temperature detection means of the present invention. Moreover, the solar power generation device 8 is an example of the solar power generation means of the present invention.

  Next, operation | movement of the soil heating apparatus of this Embodiment 2 is demonstrated.

  The heat medium pump 10 has the effect | action which supplies the heat medium condensed in the condensation part 4 of the heat pipe 2 installed in the contaminated soil vicinity to the upper evaporation part 3, and is the heat put into the top heat state. The operational stability of the pipe 2 is guaranteed. The heat medium pump 10 also has a heat medium flow rate control function.

  The configuration of the heat medium pump 10 and the type of power necessary for driving the heat medium pump 10 are not limited. However, since the soil heating apparatus according to the second embodiment is an apparatus that is input for the purpose of repairing and purifying the environment, it is desirable to minimize a new environmental load due to the input of external energy. Furthermore, since the number of soil contamination targets to be purified is expanding, it is desirable to consider the applicability in land where infrastructure for supplying power such as electric power cannot be used easily.

  From such a viewpoint, it is preferable to use natural energy that can be supplied locally as the power of the heat medium pump 10 of the soil heating apparatus in the second embodiment. In particular, since the soil heating apparatus according to the second embodiment uses sunlight for heating the heating medium, the power or solar heat obtained from the photovoltaic power generation is used as power for driving the heating medium pump 10. And is considered the most efficient.

  The solar power generation device 8 has sufficient power generation capacity to supply the drive power of the heat medium pump 10 determined according to the depth of contaminated soil to be heated, the type of heat medium, the flow rate required for heating, and the like. If it is, the kind and structure are not ask | required. By connecting the power storage device 9 such as a storage battery or an electric double layer capacitor, the operation of the heat medium pump 10 can be performed even at night or in bad weather when solar power generation is not performed.

  For example, a heat-driven pump can be used to drive the heat medium pump by solar heat. The operation mechanism when the heat-driven pump is applied to the soil heating apparatus of the second embodiment is as follows.

  First, due to the solar heat collected by the heat collecting means 1, the heat medium in the piping of the evaporation unit 3 boils and bubbles are generated in the heat medium. When the bubbles are crushed, pressure vibration is generated in the heat medium, and the heat medium heated by using the pressure vibration is sent to the condensing unit 4 below. In this way, the heat collecting means 1 installed on the ground operates as a pump that transmits the heat to the inside of the soil using the energy of the collected solar heat as power.

  The soil heating apparatus according to the second embodiment can promote the purification of contaminated soil without introducing large external energy. For this reason, the running cost required for purification can be significantly reduced, and effective soil purification can be performed even in an area where the energy infrastructure necessary for input of external energy is not established.

(Embodiment 3)
FIG. 3 is a diagram showing a concept of soil purification using a soil heating device in Embodiment 3 of the present invention. The same reference numerals are used for the same components as in FIG.

  The soil heating apparatus of the third embodiment is configured by adding a soil gas suction pipe 11, a soil gas suction pump 12, a suction gas processing apparatus 13, a supply pipe 14, and a supply apparatus 15 to the soil heating apparatus of the second embodiment. It is. The soil gas suction pipe 11 and the supply pipe 14, together with the liquid pipe 18 and the steam pipe 19, are surrounded by the heat insulating material 6 and accommodated in the protective pipe 7.

  Next, operation | movement of the soil heating apparatus of this Embodiment 3 is demonstrated.

  The soil gas suction pump 12 has an action of sucking the soil gas containing the contaminant through the soil gas suction pipe 11 in order to mainly purify the contamination by the volatile organic material in the unsaturated layer. The configuration of the soil gas suction pump 12 and the type of power necessary for driving the soil gas suction pump 12 are not particularly limited. As described in the second embodiment, the power can be obtained from photovoltaic power generation or solar heat. It is considered the most efficient to use.

  The soil gas sucked by the soil gas suction pump 12 is subjected to gas-liquid separation as required, and then the harmful gas contaminants are removed or decomposed by the suction gas processing device 13. The detoxified gas is released into the atmosphere. As the suction gas processing device 13, an adsorption tower made of activated carbon or the like, or a decomposition device using catalyst, heat, plasma, ultraviolet rays, or the like can be considered, but is not limited thereto.

  In soil pollution purification by volatile organic substances by suction of soil gas, it is cited as a problem that the removal efficiency is greatly lowered when the pollution concentration is lowered by the progress of purification. This phenomenon is thought to be due to adsorption of contaminants to soil particles and dissolution in groundwater. By using the soil heating device of the third embodiment, the desorption of the pollutants adsorbed on the soil particles, the volatilization of the pollutants dissolved in the groundwater is promoted, and even with low concentration pollution, It becomes possible to improve the removal efficiency of the pollutant from the soil by the suction of the soil gas.

  The supply device 15 has an action of supplying, through the supply pipe 14, a substance necessary for the purification of the pollutant or a substance for promoting the purification into the contaminated soil. For example, in the case of bioremediation, microbial decomposition is activated by supplying substances that are necessary for decomposing pollutants and that are thought to be deficient in contaminated soil to the contaminated part from the ground supply device. Can do. Substances to be supplied include pollutants and decomposed microorganisms such as electron acceptors typified by oxygen, substrates that serve as nutrient sources for microorganisms, nutrient salts such as nitrogen and phosphorus, and foreign microorganisms that have a high resolution of pollutants to be purified. It is appropriately selected depending on the characteristics and the properties of the soil contaminated part.

  Since the soil gas suction pipe 11 and the supply pipe 14 are housed in the protective pipe 7 together with the liquid pipe 18 and the steam pipe 19, it is necessary for gas suction by soil heating, promotion of microbial activity in the soil, and bioremediation. Therefore, it becomes possible to perform soil purification efficiently in a shorter time. At the same time, it is considered that the protective tube 7 prevents the soil heating device from being damaged and corroded, and the effect of improving workability and life is also obtained.

  In addition, the program of this invention is a program for making a computer perform the function of the flow volume control means of the soil heating apparatus of this invention mentioned above, Comprising: It is a program which operate | moves in cooperation with a computer.

  The recording medium of the present invention is a recording medium carrying a program for causing a computer to execute the function of the flow rate control means of the above-described soil heating apparatus of the present invention, and is readable and read by the computer. Is a recording medium used in cooperation with the computer.

  Further, one usage form of the program of the present invention may be an aspect in which the program is recorded on a computer-readable recording medium and operates in cooperation with the computer.

  Further, the recording medium includes a ROM and the like.

  The computer of the present invention described above is not limited to pure hardware such as a CPU, and may include firmware, an OS, and peripheral devices.

  As described above, the configuration of the present invention may be realized by software or hardware.

  As described above, the soil heating apparatus of the present invention can efficiently heat the inside of soil contaminated with chemical substances, and thus accelerates volatilization and / or decomposition of microorganisms in the soil by polluting chemical substances, Soil remediation can be implemented with a short construction period and high energy utilization efficiency.

  In addition, since latent heat transport using solar heat and heat pipes is utilized, heating inside the soil can be performed efficiently without introducing large external energy, and purification of contaminated soil can be promoted.

  The soil heating apparatus according to the present invention is useful as a soil purification system because it heats soil and groundwater contaminated with chemical substances and promotes decomposition by microorganisms and / or purification by suction of soil gas. It can also be applied to uses such as promoting plant growth by heating farmland.

Conceptual diagram of soil purification using soil heating device in Embodiment 1 of the present invention Conceptual diagram of soil purification using soil heating device in embodiment 2 of the present invention Conceptual diagram of soil purification using soil heating device in Embodiment 3 of the present invention Schematic diagram of conventional soil remediation equipment Schematic diagram of another configuration of conventional soil remediation equipment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat collecting means 2 Heat pipe 3 Evaporating part 4 Condensing part 5 Flow control valve 6 Heat insulating material 7 Protective tube 8 Solar power generation device 9 Power storage device 10 Heat medium pump 11 Soil gas suction pipe 12 Soil gas suction pump 13 Suction gas processing device DESCRIPTION OF SYMBOLS 14 Supply pipe 15 Supply apparatus 18 Liquid pipe 19 Steam pipe 20 Flow control means 21 Temperature sensor

Claims (14)

A heat collecting means arranged on the ground and collecting solar heat;
The soil heating apparatus provided with the evaporation part thermally connected with the said heat collection means, the condensation part arrange | positioned inside soil, and the heat pipe which has piping which connects the said evaporation part and the said condensation part. Furthermore, a flow rate control valve that is disposed in the pipe and controls the flow rate of the heat medium circulating in the heat pipe;
Temperature detecting means for detecting the temperature of the soil around the condensing part;
The soil heating apparatus according to claim 1, further comprising: a flow rate control unit that controls the flow rate control valve based on a temperature of the soil around the condensation unit and adjusts a heat transfer amount to the soil around the condensation unit. . Furthermore, temperature detection means for detecting the temperature of the soil around the condensation unit,
A heat medium circulation pump disposed in the pipe and moving the heat medium of the condensing unit to the evaporation unit;
The heat medium circulation pump controls the amount of the heat medium moved from the condensing unit to the evaporation unit based on the temperature of the soil around the condensing unit, thereby transferring the heat medium to the soil around the condensing unit. The soil heating apparatus of Claim 1 which adjusts calorie | heat amount.   The soil heating device according to claim 3, wherein the heat medium circulation pump is operated by heat supplied from the heat collecting means. Furthermore, it is equipped with solar power generation means that is arranged on the ground and generates power with sunlight,
The soil heating device according to claim 3, wherein the heat medium circulation pump is operated by electric power supplied from the solar power generation means. The pipe has a steam pipe in which a heat medium moves from the evaporation section to the condensation section, and a liquid pipe in which a heat medium moves from the condensation section to the evaporation section,
The soil heating device according to claim 1, wherein the steam pipe and the liquid pipe are surrounded by a heat insulating material.   Furthermore, the soil heating apparatus of Claim 6 provided with the protective pipe by which the said steam pipe and the said liquid pipe are arrange | positioned inside. And a supply pipe for supplying a substance that promotes the degradation of the soil contamination compound and / or a microorganism having a resolution of the soil contamination compound,
The soil heating apparatus according to claim 7, wherein the supply pipe is disposed inside the protective pipe together with the steam pipe and the liquid pipe.   The soil heating apparatus according to claim 8, wherein the microorganisms supplied into the soil are activated when the soil is heated. Furthermore, a soil gas suction pipe for sucking soil gas is provided,
The soil gas suction pipe is disposed inside the protective pipe together with the steam pipe and the liquid pipe, and sucks soil gas in the soil containing a contaminant when the soil is heated. Item 8. A soil heating apparatus according to Item 7. The evaporating part of a heat pipe having an evaporating part thermally connected to a heat collecting means for collecting solar heat, a condensing part arranged in the soil, and a pipe connecting the evaporating part and the condensing part. Heating by solar heat collection, evaporating the heat medium inside the evaporation section;
The vaporized heating medium moves from the evaporation section to the condensation section;
A step of heating the soil around the condensing unit by condensing the heat medium moved to the condensing unit, and purifying the soil contaminated with a chemical substance. In the laying method of the soil heating apparatus according to claim 7,
Drilling a borehole from the ground to reach the part contaminated by chemicals inside the soil;
Storing the steam pipe and the liquid pipe in the protective pipe;
A method for laying a soil heating apparatus, comprising: driving the protective pipe containing the steam pipe and the liquid pipe into the borehole.   3. The soil heating device according to claim 2, wherein a computer functions as the flow rate control means for controlling the flow rate control valve based on the temperature of the soil around the condensation unit and adjusting the amount of heat transfer to the soil around the condensation unit. Program to let you.   14. A recording medium carrying the program according to claim 13, which can be used by a computer.

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