In-situ thermal desorption heat exchange device

Abstract

The utility model discloses an in-situ thermal desorption heat exchange device, and belongs to the technical field of heat exchange devices. The device comprises an extraction well, the upper side of the extraction well is communicated with an extraction pipeline, the outer side of the extraction pipeline is fixedly connected with an injection pipeline, water flow is arranged on the inner side of the injection pipeline, a condenser is arranged on the left side of the extraction pipeline, and a gas-liquid separator is arranged on the left side of the condenser. By arranging the injection pipeline, heat on the inner side of the extraction pipeline can be transmitted to water flow on the inner side of the injection pipeline, so that the heat can be conveniently utilized, and the phenomenon that when the device is used, a large amount of heat is lost, and consequently environmental pollution is caused is avoided; and the heated water flow can be further heated and vaporized through the steam generation device, so that steam can be conveniently injected into the inner side of the soil, heat generated when the device is used is utilized, the environmental protection property of the device is further improved, and the problem that an existing in-situ thermal desorption technology is not energy-saving and environment-friendly enough is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat exchange devices, in particular to an in-situ thermal desorption heat exchange device. Background Art

[0002] Since 2010, in order to realize the city's "central adjustment" strategy and optimize the city's industrial structure and spatial layout, Guangzhou has implemented the "retreat from the second to the third" policy in the urban area, requiring more than 300 enterprises that do not meet environmental protection requirements to move out of the urban area, leaving behind a large number of polluted sites. Most of these polluted sites belong to the oil and gas, chemical, leather, papermaking and other industries, and their main pollutants are chlorinated organic solvents, benzene series, polycyclic aromatic hydrocarbons and petroleum hydrocarbons and other organic substances. These pollutants are volatile, irritating, and highly toxic, which seriously damage the ecological environment and the health of residents, restrict economic development, and governance is imminent.

[0003] At present, the common methods for removing organic contaminated soil are physical, chemical and biological methods. Among the physical methods, thermal desorption technology and gas phase extraction technology are more commonly used. Thermal desorption technology has been used in the remediation of contaminated plots since the 1970s. Its principle is to increase the temperature of the contaminated area by heating, change the physical and chemical properties of pollutants, increase the concentration of pollutants in the gas phase or liquid phase, and then extract the pollutants to the ground through extraction equipment, treat them harmlessly and then discharge them. In-situ thermal desorption technology has the advantages of short time consumption, ability to treat multiple pollutants at the same time, and strong applicability to low-permeability contaminated areas and heterogeneous contaminated areas. However, in remediation projects, in-situ thermal desorption technology is often used in conjunction with gas phase extraction technology. By heating the contaminated area, organic pollutants in the soil / groundwater are resolved, and then the pollutants are extracted to the ground through gas phase extraction wells for subsequent treatment. In the existing technology, the soil heating temperature is high, which has a great impact on the original soil environment and may damage the original environment. In addition, the extracted high-temperature gas is directly condensed by the equipment, and the energy in this part of the high-temperature gas is directly lost, which places high requirements on the subsequent processing equipment and is not energy-saving and environmentally friendly. Therefore, it is necessary to design and transform the existing in-situ thermal desorption technology to solve the problem of its lack of energy conservation and environmental protection. Utility Model Content

[0004] In order to solve the problems raised in the above background technology, the purpose of the utility model is to provide an in-situ thermal desorption heat exchange device.

[0005] The utility model provides the following technical solution: an in-situ thermal desorption heat exchange device, comprising an extraction well, wherein the upper side of the extraction well is connected to an extraction pipeline, the outer side of the extraction pipeline is fixedly connected to an injection pipeline, a water flow is arranged on the inner side of the injection pipeline, a condenser is arranged on the left side of the extraction pipeline, a gas-liquid separator is arranged on the left side of the condenser, and the lower side of the injection pipeline is connected to a steam generating device.

[0006] The beneficial effects of the utility model are as follows:

[0007] 1. The utility model sets an injection pipe so that the heat inside the extraction pipe can be transferred to the water flow inside the injection pipe, thereby facilitating the use of heat and avoiding the phenomenon of large-scale heat loss when the device is used, which is not environmentally friendly. By setting a steam generating device, the heated water flow can be further heated and vaporized by the steam generating device, so that the steam can be injected into the soil to utilize the heat generated when the device is used, further improving the environmental protection of the device and solving the problem that the existing in-situ thermal desorption technology is not energy-saving and environmentally friendly. The utility model sets an injection well, and the injection well structure is the same as the extraction well structure. By setting the injection well inside the soil, the steam can easily enter the soil, thereby improving the stability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is the front view of the structure of the utility model;

[0009] Figure 2 It is a schematic diagram of the structure flow of the utility model.

[0010] In the figure: 1. extraction well; 2. extraction pipeline; 3. injection pipeline; 4. water flow; 5. condenser; 6. gas-liquid separator; 7. steam generating device; 8. injection well. DETAILED DESCRIPTION

[0011] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0012] like Figure 1 and Figure 2As shown, the utility model provides an in-situ thermal desorption heat exchange device, including an extraction well 1, the upper side of the extraction well 1 is connected with an extraction pipeline 2, the extraction well 1 is a high-temperature resistant well pipe, and the well depth is consistent with the repair depth; the top 0-1.0m of the well pipe of the extraction well 1 is a solid pipe, and the well hole is sealed with bentonite and cement to ensure a good sealing effect; the well pipes below 1.0m are all sieve pipes with a sieve hole of 0.5mm, which are used to extract underground water-gas mixtures, and the well holes below 1.0m are filled with quartz sand, and the extraction pipeline 2 is a high-temperature resistant well pipe. The extracted water-gas mixture passes through the temperature pipeline and enters the condenser 5 and the gas-liquid separator 6 respectively. The condenser 5 includes a shell, which is made of corrosion-resistant material. A cooling water channel is arranged inside the shell. The cooling water channel can be arranged to be connected with the injection pipeline. A heat transfer pipe is arranged inside the cooling water channel. The gas-liquid separator 6 structure includes a main cylinder, a separation plate, a cyclone separator and a high-efficiency foam breaking net are arranged inside the main cylinder, and inlet and outlet pipes are arranged at both ends of the main cylinder. The inlet and outlet pipes on the right side It is connected to the condenser, and after the liquid and gas are separated by the gas-liquid separator 6, the two are discharged through the inlet and outlet pipes, and the liquid and gas are finally disposed of respectively. The outside of the extraction pipeline 2 is fixedly connected with an injection pipeline 3, and the injection pipeline 3 is a high-temperature resistant pipeline. The water flow 4 is injected into the injection well 8 through the injection pipeline 3. The front end of the injection pipeline 3 is wrapped around the outer periphery of the extraction pipeline 2, and the high-temperature gas energy in the extraction pipeline 2 is transferred to the water flow 4 through the reverse flow. The water flow 4 is arranged on the inside of the injection pipeline 3, and the condenser 5 is arranged on the left side of the extraction pipeline 2. The gas-liquid separator 6 is arranged on the left side of the condenser 5. The lower side of the injection pipeline 3 is connected with a steam generating device 7, and the steam generating device 7 includes a boiler. The right side of the boiler is connected with a water supply system, and the left side of the boiler is connected with a steam system. The water supply system is connected with the injection pipeline, and the steam system is connected with the injection well. After the energy exchange of the water flow 4 through the extraction pipeline 2, the temperature is significantly increased and enters the steam generating device 7. The temperature of the steam coming out can meet the design requirements, thereby completing the soil treatment.

[0013] refer to Figure 1 The left side of the steam generating device 7 is connected to an injection well 8.

[0014] As a technical optimization solution of the utility model, by setting the injection well 8, the structure of the injection well 8 is the same as that of the extraction well 1. By setting the injection well 8 inside the soil, steam can easily and fully enter the soil, thereby improving the stability of the device.

[0015] The working principle and use process of the utility model are as follows: when in use, the extraction well 1 and the injection well 8 are arranged inside the soil, and the water vapor mixture is extracted from the inside of the soil through the extraction well 1, so that it enters the extraction pipe 2, and then enters the condenser 5, and the water vapor mixture is cooled by the condenser 5, and the water vapor mixture will enter the inside of the heat transfer tube, and the water flow 4 arranged inside the cooling water channel will cool the water vapor mixture inside the heat transfer tube, so that the heat of the water vapor mixture can be transferred to the water flow 4 inside the cooling water channel, and then these preliminarily heated water flows 4 are sent to the inside of the injection pipe 3, and then the cooled water vapor mixture is injected into the inside of the gas-liquid separator 6, and the water vapor mixture is separated by the gas-liquid separator 6, and then the gas and liquid are finally processed respectively, and at the same time, the water flow 4 is injected into the inside of the injection pipe 3, and the preliminarily heated water flow 4 inside the condenser 5 is sent to the inside of the injection pipe 3. The water flow 4 will also enter the injection pipe 3, so that the water flow 4 can be initially heated up, and then the water flow 4 contacts the outside of the extraction pipe 2, thereby absorbing the heat inside the extraction pipe 2, and then the reheated water flow 4 after absorbing the heat is injected into the water supply system, and enters the boiler through the water supply system, and the water flow 4 is heated by the boiler to vaporize it, and then the steam is discharged into the injection well 8 through the steam system, so that the steam generating device 7 further heats the water flow 4 to generate steam, and then the steam is injected into the injection well 8, and the steam is discharged to the inside of the soil through the sieve holes of the injection well 8, so that the steam contacts the soil, and the pollutants inside the soil are separated from the soil by the steam, and then the steam is sucked into the inside of the extraction well 1 through the sieve holes, and the water vapor mixture after being sucked is extracted again to the inside of the extraction pipe 2 through the extraction well, thereby forming a cycle.

Claims

1. An in-situ thermal desorption heat exchange device, comprising an extraction well (1), characterized in that: The upper side of the extraction well (1) is connected to an extraction pipeline (2), the outer side of the extraction pipeline (2) is fixedly connected to an injection pipeline (3), the inner side of the injection pipeline (3) is provided with a water flow (4), the left side of the extraction pipeline (2) is provided with a condenser (5), the left side of the condenser (5) is provided with a gas-liquid separator (6), and the lower side of the injection pipeline (3) is connected to a steam generating device (7).

2. The in-situ thermal desorption heat exchange device according to claim 1, characterized in that: The left side of the steam generating device (7) is connected to an injection well (8).

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