Device and method for homogenizing and cooling down the contents of a tank

Abstract

The application discloses a device and method for liquid storage tank uniform mixing and cooling, which comprises a PLC controller, a base and a liquid storage tank fixedly connected to the upper wall of the base, and a second liquid return pipe and a liquid outlet pipe are fixedly connected to the side wall of the liquid storage tank from top to bottom. The application does not use a lateral agitator and a nitrogen blowing scheme, and improves the setting mode of the nozzle (or a rotating injection nozzle) in the liquid storage tank on the basis of a common pump circulation process. A static injection mixer is used. In the operation process, the liquid has no large fluctuation, the movement is gentle, and static electricity is not easily accumulated. There is no operation safety risk, the material loss of the liquid storage tank under normal pressure operation is small, energy consumption is saved, and in the circulation process, if the liquid needs to be cooled and stored, a heat exchanger is added to the process after the material pump to exchange heat and cool the liquid. The liquid after heat exchange and cooling is returned to the liquid storage tank to reduce the overall temperature in the liquid storage tank. The process is simpler, the equipment selection is less, and the operation is safer.

Description

Technical Field

[0001] This invention relates to the field of liquid chemical raw material storage technology, and in particular to equipment and methods for uniform mixing and cooling of liquid materials in storage tanks. Background Technology

[0002] Large-capacity vertical ambient temperature storage tanks are used for storing liquid chemical raw materials and oils. To prevent polymerization, polymerization inhibitors need to be added. For mixing or blending without chemical reaction, additives are added to prevent gelation when oils are stored for too long. Materials need to be stored at lower temperatures to prevent polymerization. At the same time, stirring is required. Using side agitators or nitrogen blowing can easily generate static electricity, which can cause accidents. The operation is also time-consuming and energy-intensive. It is especially unsuitable for light liquid chemicals or oils. For light materials, the high volatility can cause incalculable storage losses. In addition, the pressure inside the storage tank often approaches or even exceeds the design pressure of the storage tank, which is very dangerous. When using common material pumps to circulate and use multi-point nozzles (or rotary spray nozzles) for mixing, static electricity is easily generated, which can also easily lead to excessively high saturated vapor pressure inside the storage tank, which can also cause danger. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by proposing a device for mixing and cooling liquids in storage tanks.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] Equipment for mixing and cooling liquid in a storage tank includes a PLC controller, a base, and a storage tank fixedly connected to the upper wall of the base. A second return pipe and an outlet pipe are fixedly connected sequentially from top to bottom to the side wall of the storage tank. The ends of both the second return pipe and the outlet pipe extending into the storage tank penetrate the side wall and extend into the tank. A T-shaped distributor is fixedly connected to the end of the second return pipe extending into the tank. The T-shaped distributor has one inlet and five outlets. The inlet end of the T-shaped distributor is fixedly connected to the end of the second return pipe extending into the tank. The T-shaped distributor has five sets of outlets fixedly connected to mixing components for mixing liquids. The end of the outlet pipe away from the storage tank is fixedly connected to a material pump. The material pump is provided with an inlet and an outlet. The outlet pipe is fixedly connected to the inlet of the material pump. The outlet of the material pump is fixedly connected to a first return pipe. A cooling structure for cooling the liquid is provided between the first return pipe and the second return pipe. Temperature detection components for monitoring the liquid temperature are provided on the outer wall of the second return pipe and the outlet pipe. The temperature detection components and the cooling structure are both electrically connected to the PLC controller.

[0006] As a further description of the above technical solution:

[0007] A bracket is fixedly connected to the inner wall of the liquid storage tank and below the second return pipe. The T-shaped distributor is fixedly connected to the upper wall of the bracket. The T-shaped distributor is fixedly connected to the inner wall of the liquid storage tank through the bracket.

[0008] As a further description of the above technical solution:

[0009] The mixing assembly includes five static ejector mixers, which are fixedly connected to the five outlets of the T-type distributor.

[0010] As a further description of the above technical solution:

[0011] The five static ejector mixers are arranged in three layers when viewed from the front. The top layer of the three layers of static ejector mixers has one static ejector mixer, and the other two layers each have two static ejector mixers. The middle one of the five static ejector mixers is located on the top layer. The center line of the bottom layer of the three layers of static ejector mixers is at an angle of three degrees to the horizontal. The center line of the middle layer of the three layers of static ejector mixers is at an angle of thirty degrees to the horizontal. The center line of the top layer of the three layers of static ejector mixers is at an angle of fifty degrees to the horizontal. When viewed from above, the five static ejector mixers are arranged in a fan shape, and the angle between two adjacent pairs is fifteen degrees.

[0012] As a further description of the above technical solution:

[0013] The cooling structure includes a heat exchanger, a first reversing three-way valve, and a second reversing three-way valve. The first and second reversing three-way valves are respectively fixedly connected between opposite ends of the first and second return pipes. The outlets of the opposite ends of the first and second reversing three-way valves are fixedly connected by a pipe. The heat exchanger is fixedly connected between the outlets of the first and second reversing three-way valves perpendicular to the center extension line of the second return pipe. The end of the heat exchanger away from the storage tank is provided with a coolant circulation inlet and outlet, and the end of the heat exchanger facing the storage tank is provided with a liquid outlet. A liquid inlet is fixedly connected to the outer circumference of the heat exchanger near the coolant circulation inlet and outlet. The heat exchanger is fixedly connected to one outlet of the first reversing three-way valve perpendicular to the center extension line of the second return pipe through the liquid inlet, and the heat exchanger is fixedly connected to one outlet of the second reversing three-way valve perpendicular to the center extension line of the second return pipe through the liquid outlet.

[0014] As a further description of the above technical solution:

[0015] The temperature detection assembly includes two temperature sensors, which are respectively fixedly connected to the outer walls of the second return pipe and the outlet pipe.

[0016] As a further description of the above technical solution:

[0017] The end of the outlet pipe that extends into the storage tank is fixedly connected to a protective plate to prevent the intake of bottom water and impurities.

[0018] The present invention also provides a method for homogenizing and cooling liquid in a storage tank, wherein the liquid in the storage tank is homogenized and cooled using the equipment described above.

[0019] The present invention has the following beneficial effects:

[0020] 1. Compared with existing technologies, this equipment for mixing and cooling liquid in storage tanks does not use a side agitator or nitrogen blowing scheme. Based on the commonly used pump circulation process, it improves the setting method of the nozzle (or rotating spray nozzle) in the storage tank and adopts a static ejector mixer. During operation, the liquid does not fluctuate greatly, the movement is smooth, it is not easy to generate static electricity accumulation, there is no operational safety risk, the material loss is small when the storage tank is operated at normal pressure, and energy consumption is saved.

[0021] 2. Compared with the existing technology, the equipment for mixing and cooling liquid in storage tanks passes through the circulation process. If the liquid needs to be cooled for storage, a heat exchanger is added after the material pump to exchange heat and cool the liquid. The cooled liquid is returned to the storage tank to reduce the overall temperature inside the storage tank. The process is simpler, fewer equipment are required, and the operation is safer. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the equipment for mixing and cooling liquid in a storage tank, as proposed in this invention.

[0023] Figure 2 This is a partial sectional view of the internal structure of the liquid storage tank in the device for mixing and cooling liquid in a storage tank proposed in this invention.

[0024] Figure 3 The device proposed in this invention for mixing and cooling liquid in storage tanks Figure 2 A magnified view of a section at point A in the middle;

[0025] Figure 4 This is a top view schematic diagram of the connection structure between the T-type cooler and the static ejector mixer in the device for mixing and cooling liquid in storage tanks proposed in this invention.

[0026] Legend:

[0027] 1. Base; 2. Storage tank; 3. Material pump; 4. Discharge pipe; 5. First return pipe; 6. Heat exchanger; 7. First reversing three-way valve; 8. Second reversing three-way valve; 9. Second return pipe; 10. Temperature sensor; 11. Protective plate; 12. Support; 13. T-type distributor; 14. Static ejector mixer. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Reference Figures 1 to 4 The present invention provides a device for mixing and cooling liquid in a storage tank: including a PLC controller, a base 1 and a storage tank 2 fixedly connected to the upper wall of the base 1. A second return pipe 9 and an outlet pipe 4 are fixedly connected to the side wall of the storage tank 2 from top to bottom. The ends of the second return pipe 9 and the outlet pipe 4 facing the storage tank 2 penetrate the side wall of the storage tank 2 and extend into the interior of the storage tank 2. A protective plate 11 for preventing the intake of bottom water and impurities is fixedly connected to the end of the outlet pipe 4 that extends into the interior of the storage tank 2.

[0030] A T-shaped distributor 13 is fixedly connected to one end of the second return pipe 9 that extends into the liquid storage tank 2. A bracket 12 is fixedly connected to the inner wall of the liquid storage tank 2 and below the second return pipe 9. The T-shaped distributor 13 is fixedly connected to the upper wall of the bracket 12. The T-shaped distributor 13 is fixedly connected to the inner wall of the liquid storage tank 2 through the bracket 12. Fixing the T-shaped distributor 13 to the inner wall of the liquid storage tank 2 through the bracket 12 can prevent damage caused by static pressure settlement deformation of the bottom plate of the liquid storage tank 2 and stretching of the installed pipe.

[0031] The T-type distributor 13 is equipped with one inlet and five outlets. The inlet end of the T-type distributor 13 is fixedly connected to one end of the second return pipe 9 that extends into the storage tank 2. The five outlets of the T-type distributor 13 are fixedly connected to mixing components for mixing liquids. The mixing components include five static ejector jet mixers 14. The five static ejector jet mixers 14 are fixedly connected to the five outlets of the T-type distributor 13. By using static ejector jet mixers 14, the liquid does not fluctuate greatly during operation, the movement is smooth, it is not easy to generate static electricity accumulation, there is no operational safety risk, the storage tank 2 operates at atmospheric pressure with low material loss, and energy is saved.

[0032] The five static ejector mixers 14 are arranged in three layers when viewed from the front. The top layer of the three static ejector mixers 14 has one static ejector mixer 14, and the other two layers each have two static ejector mixers 14. The middle one of the five static ejector mixers 14 is located on the top layer. The center line of the bottom layer of the three static ejector mixers 14 makes an angle of three degrees with the horizontal. The center line of the middle layer of the three static ejector mixers 14 makes an angle of thirty degrees with the horizontal. The center line of the top layer of the three static ejector mixers 14 makes an angle of fifty degrees with the horizontal. When viewed from above, the five static ejector mixers 14 are arranged in a fan shape, and the angle between two adjacent pairs is fifteen degrees. By setting the different angles of the five static ejector mixers 14, the liquid in the tank is more evenly agitated when it returns to the storage tank 2.

[0033] A material pump 3 is fixedly connected to the end of the outlet pipe 4 away from the storage tank 2. The material pump 3 is equipped with an inlet and an outlet. The outlet pipe 4 is fixedly connected to the inlet of the material pump 3, and a first return pipe 5 is fixedly connected to the outlet of the material pump 3. A cooling structure for cooling the liquid is provided between the first return pipe 5 and the second return pipe 9. The cooling structure includes a heat exchanger 6, a first reversing three-way valve 7, and a second reversing three-way valve 8. The first reversing three-way valve 7 and the second reversing three-way valve 8 are respectively fixedly connected between the opposite ends of the first return pipe 5 and the second return pipe 9, and between the opposite outlets of the first reversing three-way valve 7 and the second reversing three-way valve 8. The heat exchanger 6 is fixedly connected via pipes between the outlets of the first reversing three-way valve 7 and the second reversing three-way valve 8, which are perpendicular to the center extension line of the second return pipe 9. The end of the heat exchanger 6 furthest from the storage tank 2 has a coolant circulation inlet and outlet, and the end facing the storage tank 2 has a liquid outlet. A liquid inlet is fixedly connected to the outer circumference of the heat exchanger 6 near the coolant circulation inlet and outlet. The heat exchanger 6 is fixedly connected to one outlet of the first reversing three-way valve 7 perpendicular to the center extension line of the second return pipe 9 via the liquid inlet, and to one outlet of the second reversing three-way valve 8 perpendicular to the center extension line of the second return pipe 9 via the liquid outlet. When cooling is required, the first reversing three-way valve 7 and the second reversing three-way valve 8 close their communication channels and open their communication channel with the heat exchanger 6, allowing liquid to pass through the heat exchanger 6. Coolant is introduced into the heat exchanger 6 through the coolant circulation inlet and outlet, exchanging heat with the liquid entering the heat exchanger 6.

[0034] Temperature detection components for monitoring liquid temperature are installed on the outer walls of the second return pipe 9 and the outlet pipe 4. The temperature detection components and the cooling structure are electrically connected to the PLC controller. The temperature detection components include two temperature sensors 10, which are fixedly connected to the outer walls of the second return pipe 9 and the outlet pipe 4, respectively. The two temperature sensors 10 are used to detect the temperature of the liquid passing through the second return pipe 9 and the outlet pipe 4, respectively.

[0035] Working principle: The T-type distributor 13 is fixedly connected to the inner wall of the storage tank 2 through the bracket 12, which can avoid damage caused by static pressure settling deformation of the bottom plate of the storage tank 2 and stretching of the installation pipe. By setting five static ejector mixers 14 at different angles, the liquid does not fluctuate greatly during operation, the movement is smooth, it is not easy to generate static electricity accumulation, there is no operational safety risk, the storage tank 2 operates at normal pressure with low material loss and energy saving, and the liquid is more evenly agitated when returning to the storage tank 2.

[0036] Two temperature sensors 10 detect the temperature of the liquid passing through the second return pipe 9 and the outlet pipe 4. When cooling is required, the first reversing three-way valve 7 and the second reversing three-way valve 8 close the communication channels between them and open the communication channel with the heat exchanger 6, allowing the liquid to pass through the heat exchanger 6. Cooling liquid is introduced into the heat exchanger 6 through the cooling circulation liquid inlet and outlet to exchange heat with the liquid entering the heat exchanger 6.

[0037] The present invention also provides a method for homogenizing and cooling liquid in a storage tank, wherein the liquid in the storage tank is homogenized and cooled using the equipment described above.

[0038] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An apparatus for mixing and cooling liquid in a storage tank, comprising a PLC controller, a base (1), and a storage tank (2) fixedly connected to the upper wall of the base (1), characterized in that: The storage tank (2) is fixedly connected to a second return pipe (9) and an outlet pipe (4) from top to bottom on its side wall. The ends of the second return pipe (9) and the outlet pipe (4) facing the storage tank (2) penetrate the side wall of the storage tank (2) and extend into the storage tank (2). A T-shaped distributor (13) is fixedly connected to the end of the second return pipe (9) that extends into the storage tank (2). The T-shaped distributor (13) is provided with one inlet and five outlets. The inlet end of the T-shaped distributor (13) is fixedly connected to the end of the second return pipe (9) that extends into the storage tank (2). The five outlets on the T-shaped distributor (13) are fixedly connected to the end of the second return pipe (9) that extends into the storage tank (2). A mixing component for mixing liquids is fixedly connected. A material pump (3) is fixedly connected to one end of the outlet pipe (4) away from the storage tank (2). The material pump (3) is provided with an inlet and an outlet. The outlet pipe (4) is fixedly connected to the inlet of the material pump (3). A first return pipe (5) is fixedly connected to the outlet of the material pump (3). A cooling structure for cooling the liquid is provided between the first return pipe (5) and the second return pipe (9). A temperature detection component for monitoring the liquid temperature is provided on the outer wall of the second return pipe (9) and the outlet pipe (4). The temperature detection component and the cooling structure are both electrically connected to the PLC controller. The mixing assembly includes five static ejector jet mixers (14), which are fixedly connected to the five outlets of the T-type distributor (13). The five static ejector mixers (14) are arranged in three layers when viewed from the front. The top layer of the three layers of static ejector mixers (14) has one static ejector mixer (14), and the other two layers each have two static ejector mixers (14). The middle one of the five static ejector mixers (14) is located on the top layer. The center line of the bottom layer of the three layers of static ejector mixers (14) makes an angle of three degrees with the horizontal. The center line of the middle layer of the three layers of static ejector mixers (14) is at an angle of three degrees with the horizontal. The horizontal angle is 30 degrees. The center line of the uppermost layer of the three-layer static ejector mixer (14) has an angle of 50 degrees with the horizontal. The five static ejector mixers (14) are arranged in a fan shape when viewed from above, and the interval between two adjacent ones is 15 degrees. The cooling structure includes a heat exchanger (6), a first reversing three-way valve (7) and a second reversing three-way valve (8). The first reversing three-way valve (7) and the second reversing three-way valve (8) are respectively fixedly connected to the opposite ends of the first return pipe (5) and the second return pipe (9). Between the first reversing three-way valve (7) and the second reversing three-way valve (8), the opposite outlets are fixedly connected by a pipe. The heat exchanger (6) is fixedly connected between the outlets of the first reversing three-way valve (7) and the second reversing three-way valve (8) perpendicular to the center extension line of the second return pipe (9). The end of the heat exchanger (6) away from the liquid storage tank (2) is provided with a coolant circulation inlet and outlet, and the end of the heat exchanger (6) facing the liquid storage tank (2) is provided with a liquid outlet. The outer circumference of the heat exchanger (6) and close to the coolant... One end of the circulation inlet and outlet is fixedly connected to a liquid inlet. The heat exchanger (6) is fixedly connected to one outlet of the first reversing three-way valve (7) perpendicular to the center extension line of the second return pipe (9) through the liquid inlet. The heat exchanger (6) is fixedly connected to one outlet of the second reversing three-way valve (8) perpendicular to the center extension line of the second return pipe (9) through the liquid outlet. The temperature detection assembly includes two temperature sensors (10), which are fixedly connected to the outer walls of the second return pipe (9) and the outlet pipe (4) respectively. The end of the outlet pipe (4) that extends into the liquid storage tank (2) is fixedly connected to a protective plate (11) to prevent the intake of bottom water and impurities.

2. The equipment for mixing and cooling liquid in a storage tank according to claim 1, characterized in that: A bracket (12) is fixedly connected to the inner wall of the liquid storage tank (2) and below the second return pipe (9). The T-shaped distributor (13) is fixedly connected to the upper wall of the bracket (12). The T-shaped distributor (13) is fixedly connected to the inner wall of the liquid storage tank (2) through the bracket (12).

3. A method for homogenizing and cooling liquid in a storage tank, characterized in that: The equipment for mixing and cooling liquid in storage tanks as described in any one of claims 1 or 2 is used to mix and cool the liquid in the storage tanks.

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