Desolvation device

Abstract

The invention discloses a solvent removal device, and relates to the technical field of petrochemical equipment, the solvent removal device comprises a solvent pump, the liquid outlet end of the solvent pump is communicated with an extraction tower and a colloid separator, the liquid inlet end of the solvent pump is communicated with an air cooler, a buffer tank is arranged between the solvent pump and the air cooler, and the buffer tank is communicated with the colloid separator. A liquid inlet pipe and a liquid outlet pipe are arranged on the buffer tank, and a filtering detection assembly and a liquid outlet switching assembly are further arranged in the buffer tank. Through the arrangement of the air cooler, the buffer tank, the solvent pump and the filtering detection assembly, the air cooler and the buffer tank can separate out and separate deasphalted oil in a mixed solution, so that the purity of a solvent entering the solvent pump is improved, the solution density is reduced, and the power of the solvent pump is reduced; in addition, a second temperature sensor and a third temperature sensor are used for monitoring the temperature of the solution in the middle of the tank body and the temperature of the solution on the tank wall, and the control module can make the switching piece control the liquid outlet sequence of the solution in the buffer tank according to the temperature threshold value.

Description

Technical Field

[0001] The present invention relates to the technical field of petrochemical equipment, in particular to a dissolution device. Background Art

[0002] Solvent deasphalting (Solvent Deasphalting) is a process used primarily in the petroleum refining industry to separate the different components of heavy oil through the selective dissolution of solvents. Its core principle is to use solvents such as propane and butane to separate deasphalted oil (DAO) and asphaltenes from vacuum residue, thereby obtaining catalytic cracking feedstock or high-value-added products.

[0003] Among them, the main function of the high-pressure solvent pump is to establish a high-pressure solvent system circulation. Its original design intention was to transport pure solvents (such as propane / butane, with a density of about 0.58g / cm³). However, during the solvent recycling process, the medium entering the high-pressure solvent pump is not a pure solvent, but a DAO solution containing deasphalted oil. The density of deasphalted oil is 0.96mg / cm³, causing the density of the mixed solution to increase to about 1.65 times that of the pure solvent (0.96 / 0.58). Although the existing design has reserved a high load margin, there is still efficiency waste.

[0004] A Chinese patent application numbered CN202021549971.9 discloses a low-pressure solvent system for a stripping device for oil refining. By optimizing the low-pressure solvent system, the solvent circulation path is changed to: after the solvent is pumped out, it is first cooled by a low-pressure solvent circulating water cooler, and then enters the solvent buffer tank. This setting reduces the heat loss caused by the solvent pump pressurization to the solvent, thereby reducing the temperature of the circulating solvent.

[0005] Similar to the above-mentioned device, when an air cooler or other cooling equipment is installed at the inlet end of the solvent pump, although DAO in the mixed solution can be precipitated and the solution entering the solvent pump can be as pure solvent as possible, the amount of DAO precipitated is not necessarily the more the better. If the mixed solution is cooled to 40-60°C, some DAO precipitation can be promoted. However, if the temperature is lower than 40°C, the opposite effect will be achieved. That is, DAO will precipitate excessively to form a colloidal precipitate, which will adhere to the inner wall of the air cooler, buffer tank or transport pipeline to form a blockage.

[0006] Moreover, even if an insulation layer is installed on the outside of the buffer tank, the temperature of the solvent inside it is greatly affected by the ambient temperature (such as the temperature difference between day and night, seasonal changes), which may cause the solvent temperature near the tank wall to be significantly lower than the solvent temperature in the middle of the tank. This difference can easily cause the temperature of the mixed solution at the tank wall to be lower than the appropriate temperature, thereby causing excessive precipitation of DAO.

[0007] In addition, during the solvent circulation process, certain factors may cause the solvent to stay in the buffer tank for a longer time, such as abnormal solvent viscosity or concentration, valve or solvent pump failure, and a sudden decrease in the liquid inlet to the buffer tank. The longer residence time will aggravate the temperature difference in the buffer tank, but the existing buffer tanks do not address this issue.

[0008] Therefore, the present invention proposes a dissolution device to solve the above problems. Summary of the Invention

[0009] The object of the present invention is to provide a dissolution device to solve the technical problems raised in the above background technology.

[0010] To achieve the above-mentioned object, the present invention provides the following technical solution: a dissolution device, comprising a solvent pump, wherein the liquid outlet of the solvent pump is connected to an extraction tower and a colloid separator, the liquid inlet of the solvent pump is connected to an air cooler, a buffer tank is provided between the solvent pump and the air cooler, the buffer tank is provided with a liquid inlet pipe and a liquid outlet pipe, and the buffer tank further comprises: The filter detection component is located inside the buffer tank and is connected to the liquid inlet pipe. After the solution enters the buffer tank through the liquid inlet pipe, the filter detection component can clean some impurities in the solution and detect the temperature; A liquid outlet switching assembly is located in the buffer tank and is connected to the filtration detection assembly and the liquid outlet pipe. The liquid outlet switching assembly can detect the solution temperature at different positions in the buffer tank and control the liquid outlet sequence of the solution according to the detection results; the liquid outlet switching assembly includes a connecting pipe connected to the liquid outlet pipe, and the connecting pipe is connected to a first connecting tube at one end away from the liquid outlet pipe, and the liquid inlet end of the first connecting tube is fixedly connected to an intermediate tube, and the end of the intermediate tube is fixedly connected to a second connecting tube at one end away from the first connecting tube. A plurality of branch pipes are connected to the side walls of the first connecting tube and the second connecting tube, and a plurality of through holes are provided on the side walls of the intermediate tube and the branch pipes, and the branch pipes are in contact with the inner wall of the buffer tank.

[0011] Preferably, the filtration detection assembly includes a filter cartridge fixedly connected to the liquid inlet pipe, a first temperature sensor is provided on the inner wall of the filter cartridge, a filter screen is fixedly connected to the liquid outlet end of the filter cartridge, an impurity collection box is provided at the bottom of the buffer tank, a connecting pipe is provided between the filter cartridge and the impurity collection box, and a valve is provided on the connecting pipe.

[0012] Preferably, an impurity cleaning assembly is provided in the filter cylinder, and the impurity cleaning assembly includes a plurality of scrapers in contact with the filter surface, and the plurality of scrapers are fixedly connected to the same connecting plate, and a connecting shaft is provided on the side of the connecting plate away from the scraper, and a guide blade is coaxially fixed on the side of the connecting shaft close to the liquid inlet end of the connecting cylinder, and the guide blade can drive the connecting plate and the scraper to rotate.

[0013] Preferably, a second temperature sensor and a third temperature sensor are respectively provided in the intermediate tube and the multiple branch tubes, and a switching component is provided between the first connecting tube and the second connecting tube. The switching component can switch the conduction state of the intermediate tube and the branch tube according to the detection results of the second temperature sensor and the third temperature sensor.

[0014] Preferably, the switching member includes a first rotating cylinder rotatably connected to the first connecting cylinder, a plurality of first connecting holes matching the branch pipes are provided on the circumferential side of the first rotating cylinder, a first annular plate coaxially arranged with the intermediate pipe is provided inside the first rotating cylinder, a first spiral track and a plurality of equally spaced liquid outlet grooves are provided on the side wall of the first annular plate, a first movable plate is slidably connected inside the first annular plate, a first connecting block matching the first spiral track is provided on the circumferential side of the first movable plate, an electromagnetic component is provided on one side of the first movable plate, and the first movable plate can be adsorbed by the electromagnetic component.

[0015] Preferably, a second rotating cylinder is rotatably connected in the second connecting cylinder, a plurality of second connecting holes matching the branch pipes are provided on the circumferential side of the second rotating cylinder, a second annular plate coaxially arranged with the intermediate pipe is provided inside the second rotating cylinder, a second spiral track and a plurality of equally distributed liquid inlet grooves are provided on the side wall of the second annular plate, a second movable plate is slidably connected in the second annular plate, an elastic member is provided between the second movable plate and the intermediate pipe, a second connecting block matching the second spiral track is provided on the circumferential side of the second movable plate, and a connecting rod is fixedly connected between the second movable plate and the first movable plate.

[0016] Preferably, the second temperature sensor detects the temperature of the solution in the middle of the buffer tank, and the third temperature sensor detects the temperature of the solution at the tank wall, and a control module electrically connected to the second temperature sensor and the third temperature sensor is provided in the first connecting tube. The control module can analyze the temperature data of the second temperature sensor and the third temperature sensor and determine whether the temperature exceeds the threshold.

[0017] Preferably, the control module determines the following: When the temperature of the solution at the tank wall is lower than that in the middle of the tank body and the temperature of the solution at the tank wall is not lower than the temperature threshold, the branch pipe is connected to the first connecting tube and the middle pipe is connected to the second connecting tube, that is, the solution at the tank wall is discharged first; When the solution temperature at the tank wall is lower than that in the middle of the tank and lower than the temperature threshold, the branch pipe is connected to the second connecting tube and the middle pipe is connected to the first connecting tube, that is, the solution in the middle of the tank is discharged first.

[0018] Preferably, a discharge pipe is provided between the liquid outlet pipe and the impurity collection box, and a control valve is provided between the discharge pipe and the liquid outlet pipe.

[0019] The beneficial effects of the present invention are: The present invention arranges an air cooler, a buffer tank, a solvent pump and a filtering and detecting component, so that the air cooler and the buffer tank can precipitate and separate DAO in the mixed solution, thereby improving the purity of the solvent entering the solvent pump, reducing the density of the solution and thereby reducing the power of the solvent pump; and the filtering and detecting component can not only perform preliminary filtration of the DAO in the solution, but also arrange a first temperature sensor to monitor the inlet temperature of the buffer tank, so as to avoid excessive precipitation of DAO due to excessive cooling power of the air cooler; in addition, the second temperature sensor and the third temperature sensor monitor the solution temperature in the middle and the tank wall of the tank body, and the control module can control the liquid discharge order of the solution in the buffer tank according to the temperature threshold value by the switching component. When the solution temperature at the tank wall is lower than the temperature threshold value, the solution in the middle of the tank body is discharged first, so as to avoid precipitation of DAO in the solvent pump due to excessively low temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The figure is a schematic diagram of the overall structure of a dissolution device of the present invention.

[0021] Figure 2 It is a schematic diagram of the three-dimensional structure of the buffer tank of the present invention.

[0022] Figure 3 This is a schematic top view of the buffer tank of the present invention.

[0023] Figure 4 for Figure 3 Cross-sectional view along the AA axis.

[0024] Figure 5 for Figure 3 Cross-sectional view along the BB direction.

[0025] Figure 6 It is a cross-sectional schematic diagram of the filtering detection component of the present invention.

[0026] Figure 7 It is a schematic diagram of the three-dimensional structure of the liquid outlet switching component of the present invention.

[0027] Figure 8 It is a cross-sectional schematic diagram of the filtration detection component and the liquid outlet switching component of the present invention.

[0028] Figure 9 for Figure 8 A magnified schematic diagram of the structure at point A in the middle.

[0029] The accompanying drawings are: 1. Solvent pump; 2. Extraction tower; 3. Colloid separator; 4. Air cooler; 5. Buffer tank; 51. Liquid inlet pipe; 52. Liquid outlet pipe; 53. Impurity collection box; 54. Discharge pipe; 6. Filtration detection assembly; 61. Filter cartridge; 62. Filter screen; 63. Connecting pipe; 64. Impurity cleaning assembly; 641. Scraper; 642. Connecting plate; 643. Connecting shaft; 644. Guide vane; 7. Liquid outlet switching assembly; 71. Connecting pipe; 72. First connecting cylinder; 73. Second connecting cylinder; 74. Intermediate pipe; 75. Branch pipe; 76. Switching member; 761. First rotating cylinder; 762. First connecting hole; 763. First annular plate; 764. First spiral track; 765. Liquid outlet trough; 766. First movable plate; 767. Second rotating cylinder; 768. Second annular plate; 769. Second spiral track; 7691. Liquid inlet trough; 7692. Second movable plate; 77. Electromagnetic member; 78. Connecting rod. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work shall fall within the scope of protection of the present invention. Example 1

[0031] During the solvent recycling process, the medium entering the high-pressure solvent pump is not a pure solvent, but a DAO solution containing deasphalted oil. The density of deasphalted oil is 0.96 mg / cm³, causing the density of the mixed solution to increase to approximately 1.65 times that of the pure solvent. Although existing designs have reserved a high load margin, there is still a waste of efficiency. In addition, when cooling equipment such as an air cooler is installed at the inlet of the solvent pump, although DAO in the mixed solution can be precipitated, making the solution entering the solvent pump as pure solvent as possible, the amount of DAO precipitated is not necessarily better. If the mixed solution is cooled to 40-60°C, some DAO precipitation can be promoted. However, if the temperature is below 40°C, the opposite effect will occur. That is, excessive DAO precipitation will form a colloidal precipitate, which will adhere to the inner wall of the air cooler, buffer tank, or transportation pipeline, causing blockage. This embodiment is specially invented to solve the above problems.

[0032] See also Figures 1 to 9 As shown, a dissolution device according to an embodiment of the present invention includes a solvent pump 1, the liquid outlet end of the solvent pump 1 is connected to an extraction tower 2 and a colloid separator 3, the liquid inlet end of the solvent pump 1 is connected to an air cooler 4, a buffer tank 5 is provided between the solvent pump 1 and the air cooler 4, the buffer tank 5 is provided with a liquid inlet pipe 51 and a liquid outlet pipe 52, and the buffer tank 5 also includes a filtering detection component 6 and a liquid outlet switching component 7.

[0033] In this embodiment, three solvent pumps 1 are provided and are respectively connected to the buffer tank 5. After cooling and separation in the air cooler 4 and the buffer tank 5, the purity of the solvent entering the solvent pump 1 is improved. The solvent pump 1 increases the solvent pressure to 7.9 MPa and then sends it to the extractor and the colloid separator 3. The improved solvent circulation volume is increased to 472 m³ / h, which not only improves the drawer effect of the extractor, but also reduces the disadvantages of multiple pump circulations and reduces the operating costs.

[0034] The filtering and detecting component 6 is located inside the buffer tank 5 and is connected to the liquid inlet pipe 51. After the solution enters the buffer tank 5 through the liquid inlet pipe 51, the filtering and detecting component 6 can clean some impurities in the solution and detect the temperature.

[0035] The liquid outlet switching assembly 7 is located in the buffer tank 5 and is connected to the filtration detection assembly 6 and the liquid outlet pipe 52. It can detect the solution temperature at different positions in the buffer tank 5 and control the liquid outlet sequence according to the detection results.

[0036] See also Figures 3 to 6 As shown, the filtration detection component 6 includes a filter cartridge 61 fixedly connected to the liquid inlet pipe 51, a first temperature sensor is provided on the inner wall of the filter cartridge 61, the filter cartridge 61 is coaxially arranged with the buffer tank 5, the liquid outlet end of the filter cartridge 61 is fixedly connected with a filter screen 62, an impurity collection box 53 is provided at the bottom of the buffer tank 5, a connecting pipe 63 is provided between the filter cartridge 61 and the impurity collection box 53, a valve is provided on the connecting pipe 63, a discharge pipe 54 is provided between the liquid outlet pipe 52 and the impurity collection box 53, and a control valve is provided between the discharge pipe 54 and the liquid outlet pipe 52. In this embodiment, the control valve is a three-way reversing valve, which can switch the conduction state between the discharge pipe 54 and the liquid outlet pipe 52.

[0037] In this embodiment, the filter screen 62 is a cylindrical structure, and the pore size of the filter screen 62 is relatively large. When the solution enters the filter cartridge 61, the filter screen 62 will separate the large particles in the solution so that they can settle at the bottom of the filter cartridge 61 and enter the connecting pipe 63 under the action of gravity. If the valve is in a closed state, the impurities in the connecting pipe 63 will not enter the impurity collection box 53. When the buffer tank 5 is subsequently cleaned, the valve is opened and the discharge pipe 54 is connected to the liquid outlet pipe 52 through the control valve. After the cleaning liquid is introduced into the buffer tank 5, the cleaning liquid discharges the impurities in the filter cartridge 61, the connecting pipe 63 and the impurity collection box 53 through the discharge pipe 54 and the liquid outlet pipe 52.

[0038] See also Figure 6As shown, in order to prevent the filter 62 from being blocked during filtration, an impurity cleaning component 64 is provided in the filter cylinder 61. The impurity cleaning component 64 includes a plurality of scrapers 641 in contact with the surface of the filter 62. The plurality of scrapers 641 are fixedly connected to the same connecting plate 642. A connecting shaft 643 is provided on the side of the connecting plate 642 away from the scraper 641. A guide blade 644 is coaxially fixed on the side of the connecting shaft 643 close to the liquid inlet end of the connecting cylinder. The guide blade 644 can drive the connecting plate 642 and the scraper 641 to rotate.

[0039] During use, the mixed solution containing DAO is cooled by the air cooler 4 to a temperature of about 40-60°C. Part of the DAO precipitates and is separated from the solvent after precipitation and filtration in the buffer tank 5. The solvent with higher purity enters the solvent pump 1 through the discharge pipe, thereby reducing the damage of the mixed solution to the solvent pump 1.

[0040] Moreover, in the process of DAO separation, in order to prevent the cooling temperature of the air cooler 4 from being too high, which may cause excessive precipitation of DAO, a first temperature sensor is provided inside the filter cartridge 61, so that the filter cartridge 61 can not only filter out large particles of impurities, but also monitor the inlet temperature of the buffer tank 5. When the first temperature sensor detects that the solution temperature is lower than the appropriate temperature, it will send an electrical signal to the control box provided outside and reduce the cooling power of the air cooler 4. Otherwise, the cooling temperature of the air cooler 4 will be increased.

[0041] In summary, through the arrangement of the air cooler 4, the buffer tank 5, the solvent pump 1 and the filtering and detecting component 6, the air cooler 4 and the buffer tank 5 can precipitate and separate the DAO in the mixed solution, thereby improving the purity of the solvent entering the solvent pump 1, reducing the density of the solution and thereby reducing the power of the solvent pump 1; moreover, the filtering and detecting component 6 can not only perform preliminary filtration on the DAO in the solution, so that large particles of impurities are intercepted and filtered in the initial stage of liquid inflow to prevent them from clogging subsequent discharge pipes and other pipelines, but also provides a first temperature sensor to monitor the inlet temperature of the buffer tank 5 to avoid excessive precipitation of DAO due to excessive cooling power of the air cooler 4. Example 2

[0042] In actual use, it was found that even if an insulation layer was provided on the outside of the buffer tank 5, the temperature of the solvent inside it was greatly affected by the ambient temperature (such as the temperature difference between day and night, seasonal changes), which could cause the temperature of the solvent near the tank wall to be significantly lower than the temperature of the solvent in the middle of the tank. This difference could easily cause the temperature of the mixed solution at the tank wall to be lower than the appropriate temperature, thereby causing excessive precipitation of DAO.

[0043] Furthermore, during the solvent circulation process, certain factors may cause the solvent to remain in the buffer tank 5 for a longer time, such as abnormal solvent viscosity or concentration, valve or solvent pump 1 failure, or a sudden decrease in the amount of liquid entering the buffer tank 5. This prolonged residence time can exacerbate the temperature difference in the buffer tank 5, but the existing buffer tank 5 does not address this issue. Further improvements have been made based on the above embodiment.

[0044] See also Figures 7 to 9 As shown, the liquid outlet switching assembly 7 includes a connecting tube 71 connected to the liquid outlet pipe 52, and the end of the connecting tube 71 away from the liquid outlet pipe 52 is connected to the first connecting tube 72, the liquid inlet end of the first connecting tube 72 is fixedly connected to the intermediate tube 74, and the end of the intermediate tube 74 away from the first connecting tube 72 is fixedly connected to the second connecting tube 73, and a plurality of branch tubes 75 are connected on the side walls of the first connecting tube 72 and the second connecting tube 73, and a plurality of through holes are opened on the side walls of the intermediate tube 74 and the branch tube 75, and the branch tube 75 is in contact with the inner wall of the buffer tank 5.

[0045] In this embodiment, four branch pipes 75 are provided and are symmetrically arranged in pairs, and the angles formed by two adjacent branch pipes 75 and the central pipe are consistent.

[0046] A second temperature sensor and a third temperature sensor are respectively provided in the intermediate tube 74 and the multiple branch tubes 75. In this embodiment, at least one temperature sensor is provided on the intermediate tube 74 and each branch tube 75. A switching member 76 is provided between the first connecting tube 72 and the second connecting tube 73. The switching member 76 can switch the conduction state of the intermediate tube 74 and the branch tube 75 according to the detection results of the second temperature sensor and the third temperature sensor.

[0047] See also Figures 8 and 9 As shown, the switching member 76 includes a first rotating cylinder 761 rotatably connected to the first connecting cylinder 72, and a plurality of first connecting holes 762 matching the branch pipe 75 are provided on the circumferential side of the first rotating cylinder 761. A first annular plate 763 coaxially arranged with the intermediate pipe 74 is provided inside the first rotating cylinder 761, and a first spiral track 764 and a plurality of equidistantly distributed liquid outlet grooves 765 are provided on the side wall of the first annular plate 763. A first movable plate 766 is slidably connected inside the first annular plate 763, and a first connecting block matching the first spiral track 764 is provided on the circumferential side of the first movable plate 766. An electromagnetic member 77 is provided on one side of the first movable plate 766. The first movable plate 766 is made of ferromagnetic material and can be adsorbed by the electromagnetic member 77.

[0048] The second connecting cylinder 73 is rotatably connected to the second rotating cylinder 767, and a plurality of second connecting holes matching the branch pipe 75 are provided on the circumferential side of the second rotating cylinder 767. The interior of the second rotating cylinder 767 is provided with a second annular plate 768 coaxially arranged with the intermediate tube 74. A second spiral track 769 and a plurality of equidistantly distributed liquid inlet grooves 7691 are provided on the side wall of the second annular plate 768. A second movable plate 7692 is slidably connected to the second annular plate 768, and an elastic member is provided between the second movable plate 7692 and the intermediate tube 74. A second connecting block matching the second spiral track 769 is provided on the circumferential side of the second movable plate 7692, and a connecting rod 78 is fixedly connected between the second movable plate 7692 and the first movable plate 766.

[0049] The first connection hole 762 and the second connection hole are staggered. When the first connection hole 762 is connected to the branch pipe 75, the second connection hole is not connected to the branch pipe 75. Otherwise, the first connection hole 762 is not connected to the branch pipe 75.

[0050] The second temperature sensor and the third temperature sensor detect the solution temperature in the middle and at the tank wall of the buffer tank 5 respectively, and a control module electrically connected to the second temperature sensor and the third temperature sensor is provided in the first connecting tube 72. The control module can analyze the temperature data of the second temperature sensor and the third temperature sensor and determine whether the temperature exceeds the threshold value.

[0051] In this embodiment, the temperature threshold is 40±5 degrees Celsius.

[0052] The control module is electrically connected to the control box arranged on the outside of the buffer tank 5. A display device is provided on the control box. When the control module sends the detection values of the second temperature sensor and the third temperature sensor to the control box and presents them through the display device, workers can view the temperature of each area in the tank body by checking the display device, and the control box can set and modify the temperature threshold of the control module.

[0053] The control module determines the following: When the temperature of the solution at the tank wall is lower than that in the middle of the tank body and is not lower than the temperature threshold, the branch pipe 75 is connected to the first connecting tube 72 and the middle pipe 74 is connected to the second connecting tube 73, that is, the solution at the tank wall is discharged first.

[0054] When the solution temperature at the tank wall is lower than that in the middle of the tank and lower than the temperature threshold, the branch pipe 75 is connected to the second connecting tube 73 and the middle pipe 74 is connected to the first connecting tube 72, that is, the solution in the middle of the tank is discharged first.

[0055] On the basis of the above embodiment, when in use, the second temperature sensor monitors the temperature of the solution in the middle of the tank body, and multiple third temperature sensors monitor the temperature of the solution near the tank wall. When the temperature at the tank wall is lower than the temperature threshold, it means that excessive precipitation of DAO may occur at the tank wall. At this time, the solution at the tank wall is not suitable for entering the solvent pump 1. The electromagnetic component 77 is controlled to be energized and the first movable plate 766 is moved toward the direction of the electromagnetic component 77. Under the setting of the first threaded track and the first connecting block, the first rotating cylinder 761 rotates a certain angle and makes the branch pipe 75 and the first connecting cylinder 72 not conductive, while the intermediate pipe 74 and the first connecting cylinder 72 are conductive. The solution in the middle of the tank body can enter the first connecting cylinder 72 through the liquid outlet groove 765, and finally enter the solvent pump 1 through the liquid outlet pipe 52.

[0056] In addition, when the intermediate tube 74 is connected to the first connecting tube 72, the branch tube 75 is connected to the second connecting tube 73, and the liquid entering the buffer tank 5 enters the branch tube 75 through the second connecting tube 73, thereby increasing the solution temperature at the tank wall through the temperature of the incoming solution.

[0057] On the contrary, if the temperature of the solution at the tank wall is within the normal temperature range, the electromagnetic component 77 is in the power-off state, and the first movable plate 766 moves toward the second connecting tube 73 under the action of the elastic component. The intermediate tube 74 is connected to the second connecting tube 73, and the branch tube 75 is connected to the first connecting tube 72. At this time, the solution at the tank wall is discharged first.

[0058] In summary, through the arrangement of the electromagnetic component 77, the switching component 76, the intermediate tube 74 and the branch tube 75, the temperature sensor monitors the temperature of the solution in the middle and the tank wall of the tank body. The control module can control the discharge order of the solution in the buffer tank 5 by the switching component 76 according to the temperature threshold. When the temperature of the solution at the tank wall is lower than the temperature threshold, the solution in the middle of the tank body is discharged first to avoid the precipitation of DAO in the solution with too low temperature in the solvent pump 1. If the temperature of the solution at the tank wall is within the normal range, the liquid is discharged from the tank wall first to avoid the solution at the tank wall staying for a long time and causing the external temperature to have too much influence on the solution.

[0059] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A dissolution device, comprising a solvent pump, wherein the liquid outlet of the solvent pump is connected to an extraction tower and a colloid separator, characterized in that: The liquid inlet end of the solvent pump is connected to an air cooler, a buffer tank is provided between the solvent pump and the air cooler, and the buffer tank is provided with a liquid inlet pipe and a liquid outlet pipe, and the buffer tank further includes: The filter detection component is located inside the buffer tank and is connected to the liquid inlet pipe. After the solution enters the buffer tank through the liquid inlet pipe, the filter detection component can clean some impurities in the solution and detect the temperature; A liquid outlet switching assembly is located in the buffer tank and is connected to the filtration detection assembly and the liquid outlet pipe. The liquid outlet switching assembly can detect the solution temperature at different positions in the buffer tank and control the liquid outlet sequence of the solution according to the detection results; the liquid outlet switching assembly includes a connecting pipe connected to the liquid outlet pipe, and the connecting pipe is connected to a first connecting tube at one end away from the liquid outlet pipe, and the liquid inlet end of the first connecting tube is fixedly connected to an intermediate tube, and the end of the intermediate tube is fixedly connected to a second connecting tube at one end away from the first connecting tube. A plurality of branch pipes are connected to the side walls of the first connecting tube and the second connecting tube, and a plurality of through holes are provided on the side walls of the intermediate tube and the branch pipes, and the branch pipes are in contact with the inner wall of the buffer tank.

2. A stripping device according to claim 1, characterized in that: The filtration detection assembly includes a filter cartridge fixedly connected to the liquid inlet pipe, a first temperature sensor is provided on the inner wall of the filter cartridge, a filter screen is fixedly connected to the liquid outlet end of the filter cartridge, an impurity collection box is provided at the bottom of the buffer tank, a connecting pipe is provided between the filter cartridge and the impurity collection box, and a valve is provided on the connecting pipe.

3. A stripping device according to claim 2, characterized in that: An impurity cleaning assembly is provided in the filter cylinder, and the impurity cleaning assembly includes multiple scrapers that contact the surface of the filter screen. The multiple scrapers are fixedly connected to the same connecting plate. A connecting shaft is provided on the side of the connecting plate away from the scraper. A guide vane is coaxially fixed on the side of the connecting shaft close to the liquid inlet end of the connecting cylinder. The guide vane can drive the connecting plate and the scraper to rotate.

4. A stripping device according to claim 3, characterized in that: A second temperature sensor and a third temperature sensor are respectively provided in the intermediate tube and multiple branch tubes. A switching component is provided between the first connecting tube and the second connecting tube. The switching component can switch the conduction state of the intermediate tube and the branch tube according to the detection results of the second temperature sensor and the third temperature sensor.

5. A stripping device according to claim 4, characterized in that: The switching member includes a first rotating cylinder rotatably connected to the first connecting cylinder, a plurality of first connecting holes matching the branch pipes are provided on the circumferential side of the first rotating cylinder, a first annular plate coaxially arranged with the intermediate pipe is provided inside the first rotating cylinder, a first spiral track and a plurality of equally spaced liquid outlet grooves are provided on the side wall of the first annular plate, a first movable plate is slidably connected inside the first annular plate, a first connecting block matching the first spiral track is provided on the circumferential side of the first movable plate, an electromagnetic component is provided on one side of the first movable plate, and the first movable plate can be adsorbed by the electromagnetic component.

6. A stripping device according to claim 5, characterized in that: A second rotating cylinder is rotatably connected in the second connecting cylinder, and a plurality of second connecting holes matching the branch pipes are provided on the circumferential side of the second rotating cylinder. A second annular plate coaxially arranged with the intermediate pipe is provided inside the second rotating cylinder, and a second spiral track and a plurality of equally distributed liquid inlet grooves are provided on the side wall of the second annular plate. A second movable plate is slidably connected in the second annular plate, and an elastic member is provided between the second movable plate and the intermediate pipe. A second connecting block matching the second spiral track is provided on the circumferential side of the second movable plate, and a connecting rod is fixedly connected between the second movable plate and the first movable plate.

7. A stripping device according to claim 6, characterized in that: The second temperature sensor detects the temperature of the solution in the middle of the buffer tank, and the third temperature sensor detects the temperature of the solution at the tank wall. A control module electrically connected to the second temperature sensor and the third temperature sensor is provided in the first connecting tube. The control module can analyze the temperature data of the second temperature sensor and the third temperature sensor and determine whether the temperature exceeds the threshold.

8. A stripping device according to claim 7, characterized in that: The control module determines the following: When the temperature of the solution at the tank wall is lower than that in the middle of the tank body and the temperature of the solution at the tank wall is not lower than the temperature threshold, the branch pipe is connected to the first connecting tube and the middle pipe is connected to the second connecting tube, that is, the solution at the tank wall is discharged first; When the solution temperature at the tank wall is lower than that in the middle of the tank and lower than the temperature threshold, the branch pipe is connected to the second connecting tube and the middle pipe is connected to the first connecting tube, that is, the solution in the middle of the tank is discharged first.

9. A stripping device according to claim 8, characterized in that: A discharge pipe is provided between the liquid outlet pipe and the impurity collecting box, and a control valve is provided between the discharge pipe and the liquid outlet pipe.

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