Soil thermal desorption in-situ artificial efficient cooling device

Abstract

The utility model relates to the technical field of soil in-situ thermal desorption soil remediation, in particular to a soil thermal desorption in-situ manual efficient cooling device which comprises a mud-water separation unit, a cooling unit and an effluent temperature control unit, the mud-water separation unit mainly comprises a feeding pipe, a three-layer rotary filter plate, a tank body inner layer, a conical centrifugal rotator and a semicircular switch plate, the three-layer rotary filter plate is arranged below the feeding pipe, the tank body inner layer is arranged below the three-layer rotary filter plate, the conical centrifugal rotator is arranged in the center of the tank body inner layer, and the semicircular switch plate is arranged in the center of the bottom of the tank body; the device has the beneficial effects that an extracted mud-water mixture can be separated, and liquid continuously flows in the tank body due to continuous stirring and is continuously contacted with the wall between the inner layer and the outer layer of the tank body to transfer heat, so that a water body is uniformly and quickly cooled, and the centrifugally cooled water body can reach the temperature required by use.

Description

Technical Field

[0001] The utility model relates to the technical field of soil in-situ thermal desorption soil remediation, in particular to a soil thermal desorption in-situ artificial high-efficiency cooling device. Background Art

[0002] Since the 1970s, in-situ thermal desorption technology has been used as an innovative solution. This technology is particularly suitable for treating volatile organic compounds and other types of organic pollutants in solid and liquid media. Its core advantage is that it can act directly on the contaminated site, reducing the risk of secondary pollution caused by pollutant transfer.

[0003] In-situ thermal desorption treatment technology usually involves heating the polluted medium to a temperature that can promote the desorption of pollutants adsorbed on the surface of the medium. This process involves thermodynamic and physicochemical mechanisms. With the action of high temperature, the pollutant molecules enter the gas phase for collection, condensation and subsequent treatment.

[0004] However, this technology leaves behind hotter soil after treatment, which cannot be reused immediately. The soil temperature problem is proportional to the duration, and higher temperatures may also affect the inherent properties of the soil, such as microbial activity, soil structure and organic matter content. Therefore, effective cooling methods are urgently needed to shorten the soil remediation and cooling cycle. Utility Model Content

[0005] In order to overcome the problem of long cooling time of the repaired soil caused by the use of thermal desorption soil remediation technology, the utility model mainly develops a soil thermal desorption in-situ artificial high-efficiency cooling device, which is used for the remediation of organic contaminated soil plots. After the in-situ thermal desorption process, the device developed this time is used to efficiently cool the repaired soil in situ, thereby shortening the cycle from remediation to commissioning of contaminated soil.

[0006] The purpose of the utility model is achieved through the following solutions:

[0007] A soil thermal desorption in-situ artificial high-efficiency cooling device, the structure of which mainly includes: a mud-water separation unit, a cooling unit and a water outlet temperature control unit; the mud-water separation unit includes: a feed pipe (1), a three-layer rotary filter plate (2), a tank inner layer (3), a conical centrifugal rotor (4), and a semicircular switch plate (33). Below the feed pipe (1) is the three-layer rotary filter plate (2), below the three-layer rotary filter plate (2) is the tank inner layer (3), the center of the tank inner layer (3) is provided with a conical centrifugal rotor (4), and the center of the tank bottom is provided with a semicircular switch plate (33); the water outlet temperature control unit includes: a box (20), a temperature sensor (21), a water outlet pipe (22), an automatic water outlet control valve (23), a call back pipe (24), an automatic call back control valve (25), and a call back pump (26). The box body (20) is below the tank body. The box body (20) has a temperature sensor (21) and a water outlet pipe (22) on the right side of the bottom. The water outlet pipe (22) is provided with an automatic water outlet control valve (23). The box body (20) has a return pipe (24) on the left side of the bottom. The return pipe (24) is connected to the feed pipe (1). An automatic return control valve (25) is provided above the return pipe (24). A return pump (26) is provided below the return pipe (24). The three-layer rotating filter plate (2) comprises: three filter plates with different pore sizes that can be controlled to flip and a rotating lever (30). The porosity of the top filter plate (27) is 200um, the porosity of the middle filter plate (28) is 100um, and the porosity of the bottom filter plate (29) is 10um. The rotating lever (30) is at both ends of the middle layer.

[0008] Furthermore, the cooling unit comprises three parts: an outer layer (5) of the tank body, a closed circulation cooling device (34), and a cold and heat exchange circulation device (35). The upper and lower ends of the right side of the outer layer (5) of the tank body are integrated with the closed circulation cooling device (34), and the cold and heat exchange circulation device (35) penetrates the right side of the closed circulation cooling device (34).

[0009] Furthermore, the conical centrifugal rotor (4) comprises two parts: a conical piece (31) and a driving rod (32), wherein the driving rod (32) is connected to the inside of the conical piece (31), and the rotation speed of the driving rod (32) is 2500-3000 rpm.

[0010] Furthermore, the tank body comprises: an inner tank layer (3) and an outer tank layer (5), the inner tank layer (3) and the outer tank layer (5) are completely isolated, and a semicircular switch plate (33) is provided in the middle of the bottom of the inner tank layer (3).

[0011] Furthermore, the closed-loop cooling device (34) comprises four parts: a liquid inlet pipe (6), a liquid outlet pipe (7), an evaporation generator (8), and a brine lift pump (19). The left end of the liquid inlet pipe (6) is connected to the lower right end of the outer layer (5) of the tank body, the left end of the liquid outlet pipe (7) is connected to the lower right end of the outer layer (5) of the tank body, the right end of the liquid inlet pipe (6) is connected to the left end of the evaporation generator (8), the right end of the liquid outlet pipe (7) is connected to the left end of the evaporation generator (8), and a brine lift pump (19) is provided between the liquid inlet pipe (6) and the evaporation generator (8).

[0012] Furthermore, the heat exchange circulation device (35) includes ten parts: a first zigzag conduit (9), a first conduit (10), a compressor (11), a second conduit (12), a condensation generator (13), a second zigzag conduit (14), a third conduit (15), a fourth conduit (16), a cooling tower (17), and a fifth conduit (18). The first zigzag conduit (9) passes through the evaporation generator (8); the upper part of the first zigzag conduit (9) enters the compressor (11) through the first conduit (10); the lower part of the compressor (11) is connected to the condensation generator (13) through the second conduit (12); a second zigzag conduit (14) is provided inside the condensation generator (13); the right side of the second zigzag conduit (14) is connected to the second conduit (12) and the left side is connected to the fifth conduit (18); the lower right end of the condensation generator (13) is connected to the cooling tower (17) through the third conduit (15) and the lower left end is connected to the fourth conduit (16); the left end of the condensation generator (13) is connected to the lower part of the first zigzag conduit (9) in the evaporation generator (8) through the fifth conduit (18).

[0013] Compared with the existing device for efficiently cooling the soil after thermal desorption, the utility model has the following advantages and beneficial effects:

[0014] 1. The stirring of the conical centrifugal rotor of the utility model during centrifugation in the tank body can not only separate the extracted mud-water mixture, but also make the liquid flow continuously in the tank body due to continuous stirring, and continuously contact and transfer heat with the wall between the inner and outer layers of the tank body, so that the water body is cooled evenly and quickly.

[0015] 2. The utility model is equipped with a temperature sensor and a callback pump in the box. If the temperature after centrifugal cooling cannot meet the demand, the callback pump is used to cool the water again to ensure that the water after centrifugal cooling can reach the required temperature for use.

[0016] 3. The utility model uses a flippable three-layer rotating filter plate. When cleaning, the filter plate can be flipped to flush the sand into the tank body and the sand in the tank body enters the box body for flushing, discharge and collection, which makes it easy to clean the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 For this utility model Figure 1 The structure diagram of the three-layer rotating filter plate;

[0019] Figure 3 For this utility model Figure 1 A top view of the interior of the tank;

[0020] Figure 4 For this utility model Figure 1 The structure diagram of the conical centrifugal rotor;

[0021] Figure 5 For this utility model Figure 1 Schematic diagram of the conical centrifugal rotor structure.

[0022] In the figure: 1, feed pipe; 2, three-layer rotating filter plate; 3, inside of the tank; 4, conical centrifugal rotor; 5, outer layer of the tank; 6, liquid inlet pipe; 7, liquid outlet pipe; 8, evaporation generator; 9, first zigzag conduit; 10, first conduit; 11, compressor; 12, second conduit; 13, condensation generator; 14, second zigzag conduit; 15, third conduit; 16, fourth conduit; 17, cooling tower; 18, fifth conduit; 19, brine lifting pump; 20, box; 21, temperature sensor; 22, water outlet pipe; 23, automatic water outlet control valve; 24, call back pipe; 25, automatic call back control valve; 26, call back pump; 27, upper filter plate; 28, middle filter plate; 29, lower filter plate; 30, rotating lever; 31, conical sheet; 32, driving lever; 33, semicircular switch plate; 34, closed circulation cooling device; 35, cold and heat exchange circulation device. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0024] Example 1

[0025] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The figure shows a soil thermal desorption in-situ artificial high-efficiency cooling device. This new device is used in a plot of land in Zhongshan City, and then the in-situ thermal desorption is used for high-efficiency cooling. The project starts soil cooling after the thermal desorption is completed. The soil cooling depth is 0-20.9m, and the theoretical volume is 14472.65m 3, the soil temperature was 98°C after thermal desorption, and the device was built 20 days in advance.

[0026] First, inject clean water into the heating well in the original thermal desorption process, connect the feed pipe to the extraction well, and the outlet pipe to the heating well. The operator turns on the power of the new device, closes the semicircular switch plate, closes the callback control valve, turns on the closed circulation cooling device equipped with 3% calcium chloride and 12ppm sodium hexametaphosphate, turns on the cold and heat exchange circulation device equipped with 1% R-290, sets the speed of the conical centrifugal rotor to 2800rpm, and the mud-water mixture is pumped to the feed pipe through the extraction well, passes through the three-layer rotating filter plate and enters the tank body. Large particles are retained on the three-layer rotating filter plate, and then small particles enter the tank body with the liquid for centrifugation. After the tank body is filled with water, turn on the semicircular switch, and the particles are centrifuged at the edge. At this time, the mixed solution of calcium chloride and sodium hexametaphosphate in the outer layer of the tank absorbs the heat of the liquid in the tank body from the inlet pipe to the outlet pipe, and transfers the heat to the R-2 in the first zigzag conduit when it flows to the evaporation generator. 90. The R-290 that absorbs heat enters the compressor through the first conduit and then enters the second zigzag conduit in the condensing generator through the second conduit for condensation and cooling. Then it enters the first zigzag conduit of the evaporating generator through the fifth conduit to absorb heat. The condensed water of the condensing generator circulates between the two third conduits and the cooling tower. The liquid in the tank body is rapidly cooled because it is constantly in contact with the wall surface between the inner and outer layers of the tank body. Then the cooled and separated water enters the box body. At this time, if the temperature of the temperature sensor is less than 35°C, the outlet valve is automatically opened to transport the water to the heating well for recycling. If the temperature sensor is greater than 35°C, the outlet valve is automatically closed, the callback control valve is automatically opened, the callback pump is opened, and the water is transported to the feed pipe for cooling again until the temperature of all temperature sensors is less than 35°C. If particulate matter is found at the water outlet during this period, the operation is stopped, and the three-layer rotating filter plate is turned over for backwashing.

[0027] The soil cooling for this project took a total of 80 days from the end of thermal desorption to complete cooling to 35°C.

[0028] Example 2

[0029] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The figure shows a soil thermal desorption in-situ artificial high-efficiency cooling device. This new device is used in a certain plot of land in Guangzhou. After the in-situ thermal desorption, the new device is used for high-efficiency cooling. After the thermal desorption is completed, the project starts to cool the soil. The soil cooling depth is 0-18m, and the theoretical volume is 10964.72m 3 , the soil temperature was 90°C after thermal desorption, and the device was built 18 days in advance.

[0030] First, inject clean water into the heating well in the original thermal desorption process, connect the feed pipe to the extraction well, and connect the water outlet pipe to the heating well. The operator turns on the power of the new device, closes the semicircular switch plate, closes the callback control valve, turns on the closed circulation cooling device equipped with 2% calcium chloride and 10ppm sodium hexametaphosphate, turns on the cold and heat exchange circulation device equipped with 0.8% R-290, sets the speed of the conical centrifugal rotor to 2700rpm, and the mud-water mixture is pumped to the feed pipe through the extraction well, passes through the three-layer rotating filter plate and enters the tank body. Large particles are retained on the three-layer rotating filter plate, and then small particles enter the tank body with the liquid for centrifugation. After the tank body is filled with water, turn on the semicircular switch, and the particles are centrifuged at the edge. At this time, the mixed solution of calcium chloride and sodium hexametaphosphate in the outer layer of the tank absorbs the heat of the liquid in the tank body from the liquid inlet pipe to the liquid outlet pipe, and transfers the heat to the R-290 in the first zigzag conduit when it flows to the evaporation generator. 290, the R-290 that absorbs heat enters the compressor through the first conduit and then enters the second zigzag conduit in the condensing generator through the second conduit for condensation and cooling, and then enters the first zigzag conduit of the evaporating generator through the fifth conduit to absorb heat. The condensed water of the condensing generator circulates between the two third conduits and the cooling tower; the liquid in the tank body is constantly in contact with the wall between the inner and outer layers of the tank body, and the temperature is rapidly reduced. Then the cooled and separated water enters the box body. At this time, if the temperature of the temperature sensor is less than 35°C, the outlet valve is automatically opened to transport the water to the heating well for recycling. If the temperature sensor is greater than 35°C, the outlet valve is automatically closed, the callback control valve is automatically opened, the callback pump is opened, and the water is transported to the feed pipe for cooling again until the temperature of all temperature sensors is less than 35°C. If particulate matter is found at the water outlet during this period, the operation is stopped, and the three-layer rotating filter plate is turned over for backwashing.

[0031] The soil cooling for this project took a total of 63 days from the end of thermal desorption to complete cooling to 35°C.

[0032] Working method: During the specific construction process of the equipment, the equipment operation procedure is as follows:

[0033] First, clean water is injected into the heating well in the original thermal desorption process, the feed pipe is connected to the extraction well, the outlet pipe is connected to the heating well, the operator turns on the power of the new device, closes the semicircular switch plate, closes the callback control valve, turns on the closed circulation cooling device equipped with 1-3% calcium chloride and 5-15ppm sodium hexametaphosphate, turns on the cold and heat exchange circulation device equipped with 0.5-1% R-290, sets the speed of the conical centrifugal rotor to 2500-3000rpm, the mud-water mixture is pumped to the feed pipe through the extraction well, passes through the three-layer rotating filter plate into the tank body, the large particles are retained on the three-layer rotating filter plate, and then the small particles enter the tank body with the liquid for centrifugation. After the tank body is filled with water, the semicircular switch is turned on, and the particles are centrifuged at the edge. At this time, the calcium chloride and sodium hexametaphosphate mixed solution in the outer layer of the tank absorbs the heat of the liquid in the tank body from the liquid inlet pipe to the liquid outlet pipe, and transfers the heat to the first broken line when it flows to the evaporation generator. The R-290 in the duct absorbs heat and enters the compressor through the first duct, and then enters the second zigzag duct in the condensing generator through the second duct for condensation and cooling, and then enters the first zigzag duct of the evaporating generator through the fifth duct to absorb heat. The condensed water of the condensing generator circulates between the two third ducts and the cooling tower; the liquid in the tank body is constantly in contact with the wall between the inner and outer layers of the tank body, and the temperature is rapidly reduced. Then the cooled and separated water enters the box body. At this time, if the temperature of the temperature sensor is less than 35°C, the outlet valve is automatically opened to transport the water to the heating well for recycling. If the temperature sensor is greater than 35°C, the outlet valve is automatically closed, the callback control valve is automatically opened, the callback pump is turned on, and the water is transported to the feed pipe for cooling again until the temperature of all temperature sensors is less than 35°C. During this period, if particulate matter is found at the water outlet, the operation is stopped, and the three-layer rotating filter plate is turned over for backwashing.

[0034] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A soil thermal desorption in-situ artificial high-efficiency cooling device, characterized by: The structure mainly includes: mud-water separation unit, cooling unit and outlet water temperature control unit; The mud-water separation unit: The invention mainly comprises five parts: a feed pipe (1), a three-layer rotating filter plate (2), an inner layer of a tank body (3), a conical centrifugal rotor (4), and a semicircular switch plate (33). Below the feed pipe (1) is the three-layer rotating filter plate (2), below the three-layer rotating filter plate (2) is the inner layer of the tank body (3), the inner layer of the tank body (3) is provided with a conical centrifugal rotor (4) at the center, and the inner layer of the tank body (3) is provided with a semicircular switch plate (33) at the center of the bottom of the tank body. The outlet water temperature control unit: The invention mainly comprises seven parts, namely, a box body (20), a temperature sensor (21), a water outlet pipe (22), an automatic water outlet control valve (23), a return pipe (24), an automatic return control valve (25), and a return pump (26). The box body (20) is located below the tank body. The temperature sensor (21) and the water outlet pipe (22) are provided on the right side of the bottom of the box body (20). The end of the water outlet pipe (22) is provided with an automatic water outlet control valve (23). The return pipe (24) is provided on the left side of the bottom of the box body (20). The return pipe (24) is connected to the feed pipe (1). An automatic return control valve (25) is provided above the return pipe (24). A return pump (26) is provided below the return pipe (24). The three-layer rotating filter plate: The invention mainly comprises three filter plates with different pore sizes that can be flipped and controlled, and a rotating rod (30), wherein the porosity of the top filter plate (27) is 200um, the porosity of the middle filter plate (28) is 100um, the porosity of the bottom filter plate (29) is 10um, and the rotating rods (30) are located at both ends of the middle layer.

2. The soil thermal desorption in-situ artificial high-efficiency cooling device according to claim 1 is characterized by: The cooling unit: The invention mainly comprises three parts: an outer layer of the tank body (5), a closed circulation cooling device (34), and a cold and heat exchange circulation device (35). The upper and lower ends of the right side of the outer layer of the tank body are integrated with the closed circulation cooling device, and the cold and heat exchange circulation device penetrates the right side of the closed circulation cooling device.

3. The soil thermal desorption in-situ artificial high-efficiency cooling device according to claim 1 is characterized by: The tank body: The invention mainly comprises an inner tank layer (3) and an outer tank layer (5), wherein the inner tank layer (3) and the outer tank layer (5) are completely isolated from each other, and a semicircular switch plate (33) is provided in the middle of the bottom of the inner tank layer (3).

4. The soil thermal desorption in-situ artificial high-efficiency cooling device according to claim 1 is characterized by: The conical centrifugal rotor: The utility model mainly comprises two parts, namely a cone-shaped piece (31) and a driving rod (32). The driving rod (32) is connected to the inside of the cone-shaped piece (31), and the rotation speed of the driving rod (32) is 2500-3000 rpm.

5. The soil thermal desorption in-situ artificial high-efficiency cooling device according to claim 2 is characterized by: The closed cycle cooling device (34): The invention mainly comprises four parts, namely, a liquid inlet pipe (6), a liquid outlet pipe (7), an evaporation generator (8), and a salt water lifting pump (19). The left end of the liquid inlet pipe (6) is connected to the lower right end of the outer layer (5) of the tank body, the left end of the liquid outlet pipe (7) is connected to the lower right end of the outer layer (5) of the tank body, the right end of the liquid inlet pipe (6) is connected to the left end of the evaporation generator (8), the right end of the liquid outlet pipe (7) is connected to the left end of the evaporation generator (8), and a salt water lifting pump (19) is arranged between the liquid inlet pipe (6) and the evaporation generator (8).

6. The soil thermal desorption in-situ artificial high-efficiency cooling device according to claim 2 is characterized by: The heat exchange circulation device: The invention mainly comprises ten parts, namely, a first zigzag conduit (9), a first conduit (10), a compressor (11), a second conduit (12), a condensation generator (13), a second zigzag conduit (14), a third conduit (15), a fourth conduit (16), a cooling tower (17), and a fifth conduit (18). The first zigzag conduit (9) passes through the evaporation generator (8), the upper part of the first zigzag conduit (9) enters the compressor (11) through the first conduit (10), and the lower part of the compressor (11) enters the condensation generator (13) through the second conduit (15). 12) is connected to a condensation generator (13), a second zigzag conduit (14) is provided inside the condensation generator (13), the right side of the second zigzag conduit (14) is connected to the second conduit (12), and the left side is connected to the fifth conduit (18), the lower right end of the condensation generator (13) is connected to a cooling tower (17) through a third conduit (15), and the lower left end is connected to a fourth conduit (16), and the left end of the condensation generator (13) is connected to the lower part of the first zigzag conduit (9) in the evaporation generator (8) through the fifth conduit (18).

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