Scaling monitoring device and heat exchanger

Abstract

The utility model provides a scaling monitoring device and a heat exchanger, the scaling monitoring device is applied to the heat exchanger, and the scaling monitoring device comprises a valve, one end of which is used for communicating with a tube box of the heat exchanger; the supporting seat is arranged at the other end of the valve; the driving unit is mounted on the supporting seat, is connected with a camera and is used for driving the camera to reciprocate along the supporting seat, so that the camera has a first state that the camera is located outside the valve and a second state that the camera penetrates through the valve and is located in the pipe box; the camera is used for collecting image information at the position of a core plate bundle of the heat exchanger. The scaling monitoring device and the heat exchanger are simple in structure and convenient to use, the scaling condition or the cleaning effect in the heat exchanger can be visually obtained, manpower and material resources are saved, and stable operation of the heat exchanger is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of heat exchange, and particularly relates to a fouling monitoring device and a heat exchanger. Background Art

[0002] A heat exchanger is a device that transfers part of the heat of a hot fluid to a cold fluid. Heat exchangers play an important role in many industrial productions such as chemical industry, petroleum, power, food, and others. In the intermediate cooling process of alumina plant production, the crystallization and fouling of the alumina sodium metaaluminate slurry solution often cause blockage of the heat exchanger in a short period, especially in the inlet and outlet areas of the heat exchanger, which not only affects the operation efficiency of the heat exchanger, but may also cause an increase in local flow velocity, resulting in abrasion failure of the equipment.

[0003] In the actual production process, the existing method is to judge the fouling situation of the heat exchanger by the increase in the pressure of the inlet slurry pump or the pressure of the pipeline, whether cleaning is required, and continue to use it after cleaning. Since the resistance of the heat exchanger is relatively small compared to the entire operating pipeline, and the pressure gauge is easily abraded or scaled on the surface, etc., which affects the accuracy, this rough evaluation method has low accuracy, is sometimes unreliable, and easily causes unnecessary shutdown cleaning. At the same time, the cleaning effect is difficult to be effectively evaluated, and the cleaning process is not easy to be improved. Therefore, there is an urgent need for a convenient and accurate fouling monitoring device. Utility Model Content

[0004] In view of this, the purpose of the present application is to provide a fouling monitoring device and a heat exchanger to solve the related problems mentioned in the background art.

[0005] Based on the above purpose, in the first aspect of the present application, a fouling monitoring device is provided, which is applied to a heat exchanger and includes: a valve, one end of which is used to communicate with the tube sheet of the heat exchanger; a support seat, which is arranged at the other end of the valve; a driving unit, which is installed on the support seat, and the driving unit is connected with a camera, and is used to drive the camera to reciprocate along the support seat, so that the camera has a first state outside the valve and a second state passing through the valve and inside the tube sheet, and the camera is used to collect image information at the core plate bundle of the heat exchanger.

[0006] Further, the driving unit is arranged on one side of the support seat and includes a motor, a transmission gear set and a lead screw connected in sequence. The end of the lead screw is provided with the camera, and the motor is used to drive the lead screw to reciprocate, thereby driving the camera to reciprocate.

[0007] Further, a protective cover is provided at the end of the lead screw, and the camera is arranged inside the protective cover.

[0008] Further, a lighting lamp is also provided inside the protective cover.

[0009] Further, an electric control box is provided on a surface of the support base away from the drive unit, and the electric control box is electrically connected to the drive unit.

[0010] Further, the valve is an electric gate valve, and the valve is electrically connected to the electric control box.

[0011] Further, a power supply, a data collector, and a signal transmitter are provided inside the electric control box.

[0012] In a second aspect of the present application, a heat exchanger is provided, including a frame and a core plate bundle disposed inside the frame. The frame is connected to a tube box, and the fouling monitoring device described in the first aspect above is provided at the tube box.

[0013] Further, a vertical connection flange is provided at a heat exchange medium port of the tube box, and the valve of the fouling monitoring device communicates with the connection flange.

[0014] Further, there are multiple heat exchange medium ports, and at least one of the heat exchange medium ports is connected to the fouling monitoring device.

[0015] As can be seen from the above, for the fouling monitoring device and the heat exchanger provided in the present application, the fouling monitoring device is applied to the heat exchanger and includes: a valve, one end of which is used to communicate with the tube box of the heat exchanger. When the valve is closed, the heat exchanger can normally perform heat exchange. When the valve is opened, it is convenient for the camera to enter or leave the tube box; a support base, disposed at the other end of the valve, for carrying the drive unit; a drive unit, installed on the support base, the drive unit is connected to a camera, and is used to drive the camera to reciprocate along the support base, so that the camera has a first state outside the valve and a second state passing through the valve and inside the tube box. The camera is used to collect image information of each heat exchange channel at the core plate bundle of the heat exchanger. In this way, the fouling condition in the heat exchange channels of the heat exchanger can be visually judged through the collected image information, without the need to judge through indirect parameters such as pipeline pressure, with higher accuracy, and without the need to disassemble the tube box blind plate for judgment, reducing the equipment disassembly and assembly process, saving manpower and material resources, and the cleaning effect of the heat exchanger can also be judged through this device to ensure the stable operation of the heat exchanger; the fouling monitoring device and the heat exchanger have a simple structure, are easy to use, can directly obtain the fouling condition or cleaning effect inside the heat exchanger, save manpower and material resources, and ensure the stable operation of the heat exchanger. Description of the Drawings

[0016] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0017] Figure 1 Schematic three-dimensional structure diagram of a heat exchanger in an embodiment of the present application;

[0018] Figure 2 is Figure 1 Schematic enlarged structure diagram of part A in;

[0019] Figure 3 Schematic structure diagram of another heat exchanger in an embodiment of the present application.

[0020] Reference numerals: 1, frame; 2, core plate bundle; 3, tube box; 3-1, connecting pipe flange; 3-2, heat exchange medium port; 4, fouling monitoring device; 5, valve; 6, support seat; 7, drive unit; 7-1, motor; 7-2, transmission gear set; 7-3, lead screw; 8, camera; 9, protective cover; 10, lighting lamp; 11, electric control box. Detailed implementation manners

[0021] To make the objectives, technical solutions, and advantages of the present application clearer and more understandable, the following further elaborates on the present application in detail in conjunction with specific embodiments and with reference to the accompanying drawings.

[0022] It should be noted that unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should have the ordinary meaning understood by those of ordinary skill in the art within the field to which this disclosure belongs. The "first", "second", and similar terms used in this disclosure do not denote any order, quantity, or importance, but are only used to distinguish different components. The terms "including" or "comprising" and the like mean that the elements or items appearing before this term cover the elements or items listed after this term and their equivalents, without excluding other elements or items. The terms "connected" or "coupled" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right", etc. are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0023] A heat exchanger is a device that transfers part of the heat of a hot fluid to a cold fluid. Heat exchangers play an important role in many industrial productions such as chemical industry, petroleum, power, food and others. In the intermediate cooling process of alumina plant production, the crystallization and fouling of alumina sodium metaaluminate slurry solution often cause the blockage of the heat exchanger in a short period, especially in the inlet and outlet areas of the heat exchanger, which not only affects the operation efficiency of the heat exchanger, but may also cause an increase in local flow velocity, resulting in abrasion failure of the equipment.

[0024] In the actual production process, the existing method is to judge the fouling situation of the heat exchanger by increasing the pressure of the inlet slurry pump or the pressure of the pipeline, and determine whether cleaning is needed. After cleaning, it can be used continuously. Since the resistance of the heat exchanger is relatively small compared to the entire operation pipeline, and the pressure gauge is easily abraded or scaled on the surface, etc., which affects the accuracy, this rough evaluation method has low accuracy, is sometimes unreliable, and easily causes unnecessary shutdown cleaning. At the same time, the cleaning effect is difficult to be effectively evaluated, and the cleaning process is not easy to be improved. In addition, when it is necessary to accurately judge the state of the heat exchanger before and after cleaning, before the existing heat exchanger is shut down for cleaning, the blind plate needs to be opened to observe whether the heat exchanger is fouled. After cleaning, the same disassembly and assembly work is carried out before starting the machine to observe the cleaning effect, which is time-consuming and laborious, affects the production efficiency, and is not convenient for daily statistical observation and cleaning process improvement.

[0025] In the process of implementing the present application, it is found that an on-line monitoring structure can be considered to be added to the plate heat exchanger, so that the effects before and after shutdown cleaning can be effectively evaluated. When it is found that the fouling of the heat exchanger is not obvious during shutdown, cleaning can be avoided to prevent ineffective cleaning. At the same time, by monitoring the situation before and after each cleaning, an evaluation result of the cleaning effect can be given, so as to facilitate the adjustment and improvement of the cleaning process.

[0026] The following further details the technical solution of the present application through specific embodiments and in combination with the attached Figures 1 to 3 drawings.

[0027] In some embodiments of the present application, a fouling monitoring device 4 is provided, which is applied to a heat exchanger, as Figures 1 to 3 shown, including: a valve 5, one end of which is used to communicate with the tube sheet 3 of the heat exchanger; a support seat 6, which is arranged at the other end of the valve 5; a driving unit 7, which is installed on the support seat 6, and the driving unit 7 is connected with a camera 8, and is used to drive the camera 8 to reciprocate along the support seat 6, so that the camera 8 has a first state outside the valve 5 and a second state passing through the valve 5 and inside the tube sheet 3, and the camera 8 is used to collect image information at the core plate bundle 2 of the heat exchanger.

[0028] As Figure 2As shown, one end of the valve 5 is used to connect to the tube sheet box 3 of the heat exchanger. When the valve 5 is closed, the heat exchanger can operate normally for heat exchange without affecting the flow of the heat exchange medium. When the valve 5 is opened, the heat exchanger has already stopped, facilitating the entry or exit of the camera 8 into or out of the tube sheet box 3.

[0029] The support base 6 is arranged at the other end of the valve 5 and is used to carry the driving unit 7, such as Figure 2 As shown, the support base 6 can be connected to the tube sheet box 3 through a bracket.

[0030] The driving unit 7 is installed on the support base 6. The driving unit 7 is connected to the camera 8 and is used to drive the camera 8 to reciprocate along the support base 6, so that the camera 8 has a first state outside the valve 5 and a second state passing through the valve 5 and inside the tube sheet box 3. The camera 8 is used to collect image information of each heat exchange channel at the core plate bundle 2 of the heat exchanger. In this way, the fouling situation in the heat exchange channels of the heat exchanger can be visually judged through the collected image information, without the need to indirectly judge through parameters such as pipeline pressure, with higher accuracy. There is also no need to disassemble the blind plate of the tube sheet box 3 for judgment, reducing the equipment disassembly and assembly process, saving manpower and material resources. The cleaning effect of the heat exchanger can also be judged through this device to ensure the stable operation of the heat exchanger.

[0031] After the heat exchanger stops, the fouling monitoring device 4 can accurately monitor the blockage situation of the heat exchanger port before cleaning, determine whether the material side needs to be cleaned, avoid ineffective cleaning, improve the operation efficiency, and save the manpower and material cost. It can also distinguish whether to clean the material side or the water side. If it is found that the material side is clean and does not need to be cleaned, and the heat exchange efficiency of the heat exchanger decreases, then the water side can be cleaned instead. The equipment disassembly and assembly process is reduced, the manpower cost is saved, and the time and equipment operation management cost are saved. By monitoring and analyzing the cleaning effect before and after cleaning, a cleaning evaluation result is given to help optimize the cleaning process, ensure that the heat exchanger starts to operate in a clean state, save energy consumption, and extend the cleaning cycle.

[0032] The fouling monitoring device 4 has a simple structure and is easy to use. It can visually obtain the fouling situation or cleaning effect inside the heat exchanger, save manpower and material resources, and ensure the stable operation of the heat exchanger.

[0033] In some embodiments, as Figure 2 shown, the driving unit 7 is arranged on one side of the support base 6 and includes a motor 7-1, a transmission gear set 7-2, and a lead screw 7-3 connected in sequence. The end of the lead screw 7-3 is provided with the camera 8, and the motor 7-1 is used to drive the lead screw 7-3 to reciprocate, thereby driving the camera 8 to reciprocate.

[0034] As Figure 2As shown, the motor 7-1 is arranged in parallel with the lead screw 7-3. The transmission gear set 7-2 includes two gears. One gear is sleeved on the output shaft of the motor 7-1, and the other gear is threadedly connected to the lead screw 7-3. The motor 7-1 drives the gear to rotate, and then drives the lead screw 7-3 to move, thereby controlling the camera 8 to switch between the first state and the second state. It is simple and convenient, and has a high space utilization rate.

[0035] In some embodiments, as Figure 2 shown, a protective cover 9 is provided at the end of the lead screw 7-3, and the camera 8 is arranged inside the protective cover 9.

[0036] As Figure 2 shown, the camera 8 is arranged inside the protective cover 9, which can play a protective role to avoid bumps, as well as the invasion of external environmental light and rain.

[0037] In some embodiments, as Figure 2 shown, a lighting lamp 10 is also provided inside the protective cover 9.

[0038] As Figure 2 shown, the lighting lamp 10 is also arranged inside the protective cover 9 so that the camera 8 can collect clear image information. The lighting lamp 10 can be turned on after the valve 5 is opened and the camera 8 moves to the pipe box 3 to provide space lighting.

[0039] In some embodiments, as Figure 2 shown, an electric control box 11 is provided on the side of the support base 6 away from the drive unit 7, and the electric control box 11 is electrically connected to the drive unit 7.

[0040] As Figure 2 shown, the drive unit 7 is arranged on one side of the support base 6, and the electric control box 11 is arranged on the other side, with a high space utilization rate. The electric control box 11 can control the movement of the camera 8.

[0041] In some embodiments, the valve 5 is an electric gate valve, and the valve 5 is electrically connected to the electric control box 11. The electric control box 11 can control the opening or closing of the valve 5.

[0042] In some embodiments, a power supply, a data collector and a signal transmitter are provided inside the electric control box 11. The power supply is used for power supply, the data collector is used for controlling the collection of image information and storing it, and the signal transmitter is used for controlling the opening and closing of the valve 5.

[0043] In some embodiments, after the wide-channel welded plate heat exchanger stops operating, hot water or cleaning liquid is passed through the material side for one hour to ensure that the non-scaling slurry solution is rinsed clean, while the hard scale that has formed, is not easily cleaned, and blocks the heat exchanger is exposed at the inlet, outlet, or flow channels of the heat exchanger. At this time, the electric gate valve automatically opens under the control of a signal, the motor 7-1 starts, drives the lead screw 7-3 to move into the tube sheet 3, the lighting lamp 10 and the camera 8 are turned on. When the camera 8 moves to face the flow channels at the inlet and outlet parts of the core plate bundle 2, the lead screw 7-3 stops moving, and the camera 8 starts to collect image information of the flow channels. After completion, the lead screw 7-3 is moved forward continuously to take pictures of the inlet and outlet flow channels of the heat exchanger core plate bundle 2 at different angles and different channels, and the data is stored and recorded by the data collector. After completion, the camera 8 exits outside the valve 5, the lighting lamp 10 is turned off, and the gate valve is closed.

[0044] The heat exchanger is cleaned by passing through cleaning lye. After the cleaning is completed, the electric gate valve is opened, and the above steps are repeated to continue taking pictures and recording. The images before and after cleaning are put into the image algorithm module for calculation, comparison, and evaluation to determine the cleaning effect, and based on the cleaning effect, optimization and improvement of the cleaning process parameters are proposed.

[0045] In some embodiments of the present application, a heat exchanger is provided, as Figure 1 and Figure 3 shown, including a frame 1 and a core plate bundle 2 disposed within the frame 1. The frame 1 is connected to a tube sheet 3, and a scaling monitoring device 4 as described in any of the above embodiments is provided at the tube sheet 3.

[0046] As Figure 1 shown, the frame 1 is used to support the heat exchanger, and the core plate bundle 2 is disposed within the frame 1 for fluid heat exchange. The core plate bundle 2 is in the shape of a cuboid and includes a plurality of stacked heat exchange plates. Different fluid flow channels can be formed between adjacent heat exchange plates, and flow channel ports are formed at the corners of the heat exchange plates. The tube sheet 3 is disposed on the frame 1 and can be welded to the frame 1. The shape is, for example, semi-cylindrical or cuboid-shaped, etc. Some tube sheets 3 are formed with heat exchange medium ports 3-2, which are communicated with the flow channel ports of the core plate bundle 2 for fluid inlet and outlet.

[0047] By providing the scaling monitoring device 4 at the tube sheet 3, the scaling situation and cleaning situation inside the heat exchanger can be monitored to ensure the stable operation of the heat exchanger.

[0048] In some embodiments, as Figure 3 shown, the scaling monitoring device 4 is connected to the tube sheet 3 that does not form a heat exchange medium port 3-2. This tube sheet 3 is used to change the flow direction of the heat exchange medium, and the scaling monitoring device 4 can monitor the scaling situation and cleaning situation of the flow channels at this place.

[0049] In some embodiments, as Figure 2As shown, a vertical nozzle flange 3-1 is provided at the heat exchange medium port 3-2 of the tube sheet 3, and the valve 5 of the fouling monitoring device 4 is communicated with the nozzle flange 3-1.

[0050] The heat exchange medium port 3-2 can be the inlet and outlet on the material side or the inlet and outlet on the water side; as Figure 2 shown, arranging the nozzle flange 3-1 at the heat exchange medium port 3-2 facilitates the connection of the valve 5, enabling the camera 8 to enter the heat exchange medium port 3-2 and face the core plate bundle 2 directly, ensuring the monitoring effect.

[0051] In some embodiments, as Figure 1 shown, there are multiple heat exchange medium ports 3-2, and at least one of the heat exchange medium ports 3-2 is connected to the fouling monitoring device 4.

[0052] As Figure 1 shown, there are four heat exchange medium ports 3-2, and the fouling monitoring device 4 can be arranged at the heat exchange medium port 3-2 at the inlet or outlet on the material side.

[0053] Those of ordinary skill in the art should understand that the discussion of any above embodiments is only exemplary and is not intended to imply that the scope of the present disclosure (including the claims) is limited to these examples; under the concept of this application, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the present application as described above, which are not provided in detail for the sake of brevity.

[0054] The embodiments of the present application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A scaling monitoring device, characterized in that: Applications in heat exchangers, including: A valve, one end of which is used to communicate with the pipe box of the heat exchanger; A support seat, arranged at the other end of the valve; A driving unit is installed on the support base, and the driving unit is connected to a camera for driving the camera to move back and forth along the support base so that the camera has a first state outside the valve and a second state passing through the valve and inside the pipe box. The camera is used to collect image information at the core plate bundle of the heat exchanger.

2. The scaling monitoring device according to claim 1, characterized in that: The driving unit is arranged on one side of the support base, and includes a motor, a transmission gear set and a screw rod connected in sequence. The camera is arranged at the end of the screw rod. The motor is used to drive the screw rod to move back and forth, thereby driving the camera to move back and forth.

3. The scaling monitoring device according to claim 2, characterized in that: A protective cover is provided at the end of the screw rod, and the camera is arranged in the protective cover.

4. The scaling monitoring device according to claim 3, characterized in that: A lighting lamp is also arranged in the protective cover.

5. The scaling monitoring device according to claim 1, characterized in that: An electric control box is provided on a side of the support base away from the driving unit, and the electric control box is electrically connected to the driving unit.

6. The scaling monitoring device according to claim 5, characterized in that: The valve is an electric gate valve, and the valve is electrically connected to the electric control box.

7. The scaling monitoring device according to claim 5, characterized in that: The electric control box is provided with a power supply, a data collector and a signal transmitter.

8. A heat exchanger, characterized in that: It comprises a frame and a core plate bundle arranged in the frame, the frame is connected to a pipe box, and the pipe box is provided with a scaling monitoring device as described in any one of claims 1 to 7.

9. The heat exchanger according to claim 8, characterized in that A vertical connecting flange is provided at the heat exchange medium port of the pipe box, and the valve of the scaling monitoring device is connected to the connecting flange.

10. The heat exchanger according to claim 9, characterized in that There are multiple heat exchange medium ports, and at least one of the heat exchange medium ports is connected to the scaling monitoring device.

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