Overhead condenser shell pass cleaning device and method

Abstract

The invention discloses an overhead condenser shell pass cleaning device and method, belongs to the technical field of heat exchange equipment maintenance, and mainly aims at achieving more efficient, convenient and thorough cleaning of an overhead condenser shell pass. According to the main technical scheme, the cleaning device comprises a circulating pipeline and a cleaning pipeline; the circulating pipeline comprises a circulating water inlet pipe and a circulating water return pipe, the circulating water inlet pipe and the circulating water return pipe form a loop which is communicated end to end through a shell pass of the overhead condenser, and a switching valve is arranged on the circulating water return pipe; the cleaning pipeline comprises a bypass pipe and a dispensing pipe, the two ends of the bypass pipe are communicated with an inlet pipe and an outlet pipe of the switching valve respectively, and a cleaning pump is arranged on the bypass pipe; two ends of the dispensing pipe are respectively communicated with an inlet pipe and an outlet pipe of the cleaning pump, and a dispensing tank is arranged on the dispensing pipe; wherein a first control valve is arranged on an inlet pipe of the cleaning pump, a second control valve is arranged on an outlet pipe of the cleaning pump, a third control valve is arranged on an inlet pipe of the dispensing tank, and a fourth control valve is arranged on an outlet pipe of the dispensing tank.

Description

Technical Field

[0001] This application belongs to the field of heat exchange equipment maintenance technology, specifically relating to a top-mounted condenser shell-side cleaning device and method. Background Technology

[0002] Overhead condensers are critical heat exchange equipment in industries such as chemical, petroleum, and energy. Their shell-side structure is prone to accumulating impurities such as sludge, scale, oil, and microbial deposits over long-term operation. These deposits not only significantly reduce the heat exchange efficiency of the equipment, leading to increased energy consumption and decreased production efficiency, but can also cause problems such as pipe blockage and equipment corrosion, and in severe cases, even affect the safe and stable operation of the entire production system. Therefore, regular or irregular maintenance and cleaning of the overhead condenser shell-side is necessary.

[0003] Currently, traditional cleaning methods rely on high-pressure water sources, require disassembling equipment pipelines, and are prone to damaging seals during the cleaning process. They also have limited effectiveness in removing stubborn sludge, especially in removing deposits from complex structures such as shell corners and baffle gaps. Summary of the Invention

[0004] In view of this, this application provides a top-mounted condenser shell-side cleaning device and method, the main purpose of which is to achieve more efficient, convenient and thorough cleaning of the top-mounted condenser shell-side.

[0005] To achieve the above objectives, this application mainly provides the following technical solutions: One aspect of this application provides an over-the-top condenser shell-side cleaning device, comprising: Circulation piping and cleaning piping; The circulation pipeline includes a circulation inlet pipe and a circulation return pipe. The circulation inlet pipe and the circulation return pipe form a loop that is connected end to end through the shell side of the top condenser. A switching valve is provided on the circulation return pipe. The cleaning pipeline includes a bypass pipe and a dosing pipe. The two ends of the bypass pipe are connected to the inlet pipe and the outlet pipe of the switching valve, respectively, and a cleaning pump is installed on the bypass pipe. The two ends of the dosing pipe are connected to the inlet pipe and the outlet pipe of the cleaning pump, respectively, and a dosing tank is installed on the dosing pipe. The cleaning pump has a first control valve on its inlet pipe, a second control valve on its outlet pipe, a third control valve on its inlet pipe, and a fourth control valve on its outlet pipe.

[0006] Optionally, the circulation pipeline further includes: The water injection pipe is connected to the circulating water inlet pipe, and a water injection valve is provided on the water injection pipe.

[0007] Optionally, the circulation pipeline further includes: A drain pipe is connected to the circulating return water pipe, and a drain valve is provided on the drain pipe.

[0008] Optionally, a one-way valve is provided on the pipeline connecting the circulating water inlet pipe and the circulating water return pipe. The one-way valve is configured to allow fluid in the circulating water return pipe and the bypass pipe to enter the circulating water inlet pipe in one direction only.

[0009] Optionally, a drain valve is also provided on the inlet pipe of the cleaning pump, and the drain valve is located upstream of the first control valve along the flow path direction of the fluid in the inlet pipe of the cleaning pump.

[0010] Optionally, a flow meter is provided on the circulating water inlet pipe to monitor the fluid flow rate in the circulating water inlet pipe.

[0011] Optionally, the circulating return water pipe is also provided with an air vent valve, which is located at the apex of the fluid flow path inside the circulating return water pipe.

[0012] Optionally, the top of the drug preparation tank is connected to a dosing hopper, and a dosing valve is provided on the pipeline connecting the dosing hopper and the drug preparation tank.

[0013] Optionally, the bottom of the medicine preparation tank is provided with an emptying valve for emptying the medicine preparation tank.

[0014] Another aspect of this application provides a method for cleaning the shell side of an over-the-top condenser, applied to the over-the-top condenser shell side cleaning apparatus described in any one of the above claims, the method comprising: Close the switching valve, open the first control valve, the second control valve and the third control valve, and add stripping agent into the dispensing tank to prepare the stripping solution; When the stripping fluid reaches the first preset concentration, the third control valve is closed and the fourth control valve is opened. After circulating for a first time, the stripping medium and deposits are discharged. After the sewage discharge is completed, water is added to the shell side of the overhead condenser; When the liquid level in the shell side of the overhead condenser reaches the preset level, the third control valve is opened to add corrosion and scale inhibitor to the dosing tank to prepare corrosion and scale inhibitor solution. When the corrosion and scale inhibitor solution reaches the second preset concentration, the third control valve is closed and the fourth control valve is opened. After a second cycle, the corrosion and scale inhibitor medium is discharged.

[0015] By employing the above technical solution, this application has at least the following beneficial effects: The overhead condenser shell-side cleaning device and method provided in the embodiments of this application integrates a cleaning pipeline into the circulation pipeline, eliminating the need to disassemble the equipment body and pipelines during cleaning. This avoids problems such as seal wear and reduced installation accuracy caused by disassembly required in traditional high-pressure cleaning, thus reducing equipment maintenance costs and downtime. Furthermore, the cleaning pump in the cleaning pipeline provides stable circulation power, which, combined with the cleaning fluid injected from the dosing tank, forms a synergistic cleaning mechanism of chemical stripping and fluid flushing. This allows for targeted removal of deposits in cleaning blind spots such as corners and baffle gaps in the overhead condenser shell-side, achieving the goal of thoroughly cleaning the overhead condenser shell-side. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an optional embodiment of the overhead condenser shell-side cleaning device of this application; Figure 2 This is a flowchart of an optional embodiment of the overhead condenser shell-side cleaning method of this application.

[0017] The reference numerals in the attached figures are as follows: 1. Circulating water inlet pipe; 2. Circulating water return pipe; 3. Switching valve; 4. Bypass pipe; 5. Dosing pipe; 6. Cleaning pump; 7. Dosing tank; 8. First control valve; 9. Second control valve; 10. Third control valve; 11. Fourth control valve; 12. Water injection pipe; 13. Water injection valve; 14. Drain pipe; 15. Drain valve; 16. Check valve; 17. Sewage valve; 18. Flow meter; 19. Air vent valve; 20. Dosing hopper; 21. Dosing valve; 22. Drain valve. Detailed Implementation

[0018] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0020] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0021] The preferred embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0022] See Figure 1 As shown in the embodiment of this application, a top-mounted condenser shell-side cleaning device is provided, including a circulation pipeline and a cleaning pipeline; the circulation pipeline includes a circulation inlet pipe 1 and a circulation return pipe 2, the circulation inlet pipe 1 and the circulation return pipe 2 forming a loop connected end to end through the top-mounted condenser shell side, and a switching valve 3 is provided on the circulation return pipe 2; the cleaning pipeline includes a bypass pipe 4 and a dosing pipe 5, the two ends of the bypass pipe 4 are respectively connected to the inlet pipe and the outlet pipe of the switching valve 3, and a cleaning pump 6 is provided on the bypass pipe 4; the two ends of the dosing pipe 5 are respectively connected to the inlet pipe and the outlet pipe of the cleaning pump 6, and a dosing tank 7 is provided on the dosing pipe 5; wherein, a first control valve 8 is provided on the inlet pipe of the cleaning pump 6, a second control valve 9 is provided on the outlet pipe of the cleaning pump 6, a third control valve 10 is provided on the inlet pipe of the dosing tank 7, and a fourth control valve 11 is provided on the outlet pipe of the dosing tank 7.

[0023] The overhead condenser shell-side cleaning device provided in this embodiment integrates the cleaning pipeline on the circulation pipeline, eliminating the need to disassemble the equipment body and pipeline during cleaning. This avoids problems such as seal wear and reduced installation accuracy caused by disassembly required by traditional high-pressure cleaning, thereby reducing equipment maintenance costs and downtime.

[0024] The overhead condenser shell-side cleaning device provided in this embodiment uses a cleaning pump 6 in the cleaning pipeline to provide stable circulation power. Combined with the cleaning fluid injected by the dosing tank 7, it can form a synergistic cleaning mechanism of chemical stripping and fluid flushing. It can target and remove deposits in cleaning blind spots such as corners and baffle gaps of the overhead condenser shell-side, thus achieving the purpose of thoroughly cleaning the overhead condenser shell-side.

[0025] The over-the-top condenser shell-side cleaning device has a dual-loop structure. It achieves basic fluid circulation through a circulation pipeline and enhances the cleaning function by superimposing a cleaning pipeline. Shell-side maintenance can be completed without disassembling the equipment.

[0026] Specifically, the circulation pipeline is a closed loop consisting of the circulating water inlet pipe 1, the circulating water return pipe 2, and the shell side of the overhead condenser, forming a physical circulation channel of "circulating water inlet pipe 1 → shell side of overhead condenser → circulating water return pipe 2 → circulating water inlet pipe 1". In normal production mode, the circulation pipeline serves as the circulation channel for the refrigerant (such as water), realizing the heat exchange function of the overhead condenser; in cleaning mode, the circulation pipeline becomes the main circulation path for the cleaning medium, realizing the cleaning function of the shell side of the overhead condenser.

[0027] In order to switch between different working modes of the circulation pipeline, a switching valve 3 is installed on the circulation return water pipe 2. In normal production mode, the switching valve 3 remains open; in cleaning mode, the switching valve 3 remains closed.

[0028] To connect the overhead condenser shell side with the cleaning pipeline, the bypass pipe 4 of the cleaning pipeline is connected at both ends to the inlet and outlet pipes of the switching valve 3 on the circulating return water pipe 2, forming a bypass path in parallel with the circulating pipeline. When the switching valve 3 is closed, the circulating return water pipe 2 is cut off, and the water that originally flowed through the circulating return water pipe 2 is forced to change course and enter the bypass pipe 4. There, it mixes thoroughly with the cleaning solution injected by the chemical mixing tank 7 in the pipeline to form a cleaning medium with cleaning capabilities. Driven by the cleaning pump 6, this cleaning medium circulates along the path of "bypass pipe 4 → circulating inlet pipe 1 → overhead condenser shell side → circulating return water pipe 2 → bypass pipe 4". Through a synergistic cleaning mechanism of chemical stripping and fluid flushing, deep cleaning of the inner wall of the shell side and complex structures is achieved.

[0029] Specifically, the cleaning pump 6 is installed on the bypass pipe 4, serving as the core power unit of the cleaning pipeline. Its inlet and outlet are respectively equipped with a first control valve 8 and a second control valve 9. When the first control valve 8 is open, it allows water from the circulating return water pipe 2 to enter the bypass pipe 4; when the first control valve 8 is closed, it cuts off the inlet of the bypass pipe 4, preventing water from the circulating return water pipe 2 from entering the bypass pipe 4. When the second control valve 9 is open, it allows water or cleaning medium (such as a mixture of water and cleaning fluid) output by the cleaning pump 6 to enter the circulating water inlet pipe 1 through the bypass pipe 4; when the second control valve 9 is closed, it cuts off the outlet of the bypass pipe 4, preventing water or cleaning medium output by the cleaning pump 6 from entering the circulating water inlet pipe 1 through the bypass pipe 4.

[0030] In order to achieve the mixing of water and cleaning solution in bypass pipe 4, a dosing pipe 5 is connected between the inlet pipe and outlet pipe of cleaning pump 6. A dosing tank 7 is installed on the dosing pipe 5, and the dosing tank 7 can store cleaning agent.

[0031] Specifically, the connection point between the dosing pipe 5 and the inlet pipe of the cleaning pump 6 is located upstream of the first control valve 8, and the connection point between the dosing pipe 5 and the outlet pipe of the cleaning pump 6 is located downstream of the second control valve 9. The dosing tank 7 serves as a drug storage unit, with a third control valve 10 at its inlet and a fourth control valve 11 at its outlet. When the third control valve 10 is open, water from the outlet of the cleaning pump 6 is allowed to flow into the dosing tank 7 from the top via the dosing pipe 5, where it fully dissolves and mixes with the cleaning agent inside the dosing tank 7 to form a cleaning solution. When the third control valve 10 is closed, it cuts off the inlet of the dosing tank 7, preventing water from entering and thus preventing excessive dilution of the cleaning solution or overflow of the tank. When the fourth control valve 11 is in the open state, the cleaning solution in the dosing tank 7 is allowed to be injected into the bypass pipe 4 from the bottom of the dosing tank 7 through the dosing pipe 5, and after merging with the water in the bypass pipe 4, it enters the shell side of the overhead condenser to achieve chemical cleaning; when the fourth control valve 11 is in the closed state, the outlet of the dosing tank 7 is cut off, and the injection of cleaning solution into the bypass pipe 4 is stopped, which is used for the isolation of residual cleaning solution after cleaning or for system maintenance.

[0032] In the normal production mode, the switching valve 3 on the circulating return water pipe 2 of the overhead condenser shell-side cleaning device provided in this embodiment remains open, forming a closed loop of "circulating water inlet pipe 1 → overhead condenser shell-side → circulating return water pipe 2 → circulating water inlet pipe 1". At this time, the first control valve 8, the second control valve 9, the third control valve 10, and the fourth control valve 11 in the cleaning pipeline are all closed, and no fluid flows through the bypass pipe 4 and the dosing pipe 5. The device only serves as a heat exchange circulation channel for water. In the cleaning mode, the switching valve 3 of the circulating return water pipe 2 is closed, cutting off the original path of the circulating pipeline and forcing the fluid to change course and enter the bypass pipe 4. At the same time, the first control valve 8 and the second control valve 9 are opened, and the cleaning pump 6 is started, forming a new circulation path of "bypass pipe 4 → circulating water inlet pipe 1 → overhead condenser shell-side → circulating return water pipe 2 → bypass pipe 4". After the cleaning pump 6 starts, a portion of the fluid from its outlet flows into the dosing tank 7 through the dosing pipe 5, where it dissolves and mixes with the cleaning agent inside, forming a cleaning solution with chemical stripping capabilities. At this time, the third control valve 10 opens. The mixed cleaning solution is then injected into the bypass pipe 4 through the outlet of the dosing pipe 5, which is opened by the fourth control valve 11, and merges with the water flowing into the circulating return water pipe 2, forming a cleaning medium of uniform concentration. The cleaning pump 6 acts as a power source, driving the cleaning medium to circulate. During the circulation process, the cleaning medium breaks down the adhesion between the deposits and the shell surface, while the fluid flushing carries away the stripped deposits, achieving targeted removal of blind spots such as corners and crevices.

[0033] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 1 As shown, the circulation pipeline also includes a water injection pipe 12, which is connected to the circulation inlet pipe 1, and a water injection valve 13 is provided on the water injection pipe 12.

[0034] In this embodiment, the water injection pipe 12 allows for flexible replenishment of the circulating medium, ensuring the normal start-up and operation of the circulation system. Specifically, before cleaning, a fixed amount of water can be injected into the circulation pipeline through the water injection pipe 12, mixing with the cleaning agent in the mixing tank 7 to form a cleaning solution of a first preset concentration. This operation is controlled by the on / off switch of the water injection valve 13, enabling precise adjustment of the water volume and ensuring that the cleaning solution ratio meets the process requirements. During equipment operation, water is injected into the circulation inlet pipe 1 through the water injection pipe 12 to maintain the fluid pressure in the circulation pipeline, providing basic power for water circulation and ensuring the stable operation of the heat exchange function of the overhead condenser.

[0035] Understandably, during the circulation of the cleaning medium, the water injection valve 13 remains closed to prevent unprepared external water from directly entering the circulation pipeline. This ensures a stable concentration of the cleaning medium, prevents dilution of the cleaning medium due to additional water injection, thus avoiding weakening the chemical stripping effect. It also prevents fluid pressure imbalance within the circulation pipeline, ensuring the normal operation of the circulation power system driven by the cleaning pump 6, and ensuring that the cleaning efficiency and effect of the top condenser shell side are not affected.

[0036] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 1 As shown, the circulation pipeline also includes a drain pipe 14, which is connected to the circulation return water pipe 2, and a drain valve 15 is provided on the drain pipe 14.

[0037] In this embodiment, the drain pipe 14 and drain valve 15 can work in conjunction with the water injection pipe 12 and water injection valve 13 to achieve water circulation for heat exchange through the overhead condenser. Specifically, when the water injection pipe 12 injects water into the circulating water inlet pipe 1, the drain valve 15 is opened simultaneously to discharge an equal amount of water.

[0038] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 1 As shown, a one-way valve 16 is provided on the pipeline connecting the circulating water inlet pipe 1 and the circulating water return pipe 2. The one-way valve 16 is configured to allow the fluid in the circulating water return pipe 2 and the bypass pipe 4 to enter the circulating water inlet pipe 1 in one direction.

[0039] In the cleaning mode, the cleaning medium enters the shell side of the overhead condenser from the bypass pipe 4 via the circulating water inlet pipe 1, and then flows back to the bypass pipe 4 through the circulating water return pipe 2, forming a circulation path. The one-way valve 16 can prevent the cleaning medium in the circulating water inlet pipe 1 from flowing back into the circulating water return pipe 2 or the bypass pipe 4, ensuring that the cleaning medium flows in the preset direction of "bypass pipe 4 → circulating water inlet pipe 1 → overhead condenser shell side → circulating water return pipe 2 → bypass pipe 4", maintaining the continuity and stability of the cleaning cycle, and avoiding abnormal load on the cleaning pump 6 or uneven concentration of the cleaning medium due to fluid backflow.

[0040] In normal production mode, water in the circulation pipeline enters the shell side of the overhead condenser from the circulation inlet pipe 1, and then flows back to the circulation inlet pipe 1 via the circulation return pipe 2. The one-way valve 16 prevents water from flowing back into the circulation return pipe 2 from the circulation inlet pipe 1, ensuring that the water circulates in the predetermined direction, guaranteeing the normal operation of the heat exchange function of the overhead condenser, and avoiding the impact of fluid backflow on heat exchange efficiency.

[0041] In addition, a check valve 16 can also be installed on the outlet pipe of the cleaning pump 6. It is understandable that without the check valve 16, when the cleaning pump 6 stops running, the fluid in the circulating water inlet pipe 1 may flow back due to inertia or pressure difference, causing the impeller of the cleaning pump 6 to reverse. Impeller reversal may damage the bearings, seals, and other components of the cleaning pump 6, shortening its service life. The check valve 16 can promptly block fluid backflow when the cleaning pump 6 stops running, protecting it from damage caused by reversal. Simultaneously, a check valve 16 can also be installed on the outlet pipe of the mixing tank 7. During the process of injecting cleaning fluid from the mixing tank 7 into the bypass pipe 4, the check valve 16 can prevent the fluid in the bypass pipe 4 from flowing back into the mixing tank 7, avoiding an imbalance in the mixing ratio of the cleaning fluid and the cleaning agent in the mixing tank 7, and ensuring that the concentration of the cleaning fluid meets the cleaning process requirements. At the same time, preventing fluid backflow also avoids safety hazards such as tank deformation or rupture of the mixing tank 7 due to abnormal pressure.

[0042] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 1 As shown, a drain valve 17 is also provided on the inlet pipe of the cleaning pump 6. The drain valve 17 is located upstream of the first control valve 8 along the flow path of the fluid in the inlet pipe of the cleaning pump 6.

[0043] In this embodiment, by setting a drain valve 17, the cleaning medium and the deposits stripped from the shell side of the overhead condenser can be effectively discharged from the device after the cleaning operation. Specifically, after the cleaning operation is completed, the water injection valve 13 on the water injection pipe 12 is first opened to inject water into the circulating water inlet pipe 1, thereby gradually pushing the remaining cleaning medium and deposits in the device toward the drain valve 17. At the same time, the drain valve 17 is opened, allowing the cleaning medium and deposits to be discharged from the device through the drain valve 17. Through this coordinated operation of water injection and draining, it can be ensured that the cleaning medium and deposits in the device are thoroughly removed, effectively avoiding any adverse effects on subsequent production operations.

[0044] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 1 As shown, a flow meter 18 is installed on the circulating water inlet pipe 1 to monitor the fluid flow rate in the circulating water inlet pipe 1.

[0045] In this embodiment, the flow rate of the fluid in the circulating water inlet pipe 1 can be monitored in real time by setting a flow meter 18, allowing operators to keep track of the fluid flow status during the cleaning process. It is understood that by monitoring the flow rate, it can be ensured that the cleaning medium circulates at an appropriate flow rate. If the flow rate is insufficient, the cleaning medium may not have enough flushing force on the shell side of the overhead condenser, affecting the cleaning effect; if the flow rate is too high, it may increase the load on the cleaning pump 6, resulting in energy waste.

[0046] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 1 As shown, the circulating return water pipe 2 is also equipped with an air vent valve 19, which is located at the apex of the fluid flow path inside the circulating return water pipe 2.

[0047] In this embodiment, after the device completes the cleaning operation and removes the deposits, when water is replenished to the shell side of the over-the-top condenser, the exhaust valve 19 can actively discharge the gas in the circulation pipeline and the over-the-top condenser, ensuring that the shell side of the over-the-top condenser is completely filled with water, laying the foundation for the stable operation of the subsequent heat exchange function.

[0048] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 1 As shown, the top of the medicine preparation tank 7 is connected to a dosing hopper 20, and a dosing valve 21 is provided on the pipeline connecting the dosing hopper 20 and the medicine preparation tank 7.

[0049] In this embodiment, by setting a dosing hopper 20 on the top of the dosing tank 7, cleaning agent can be directly added into the dosing tank 7, reducing the difficulty of operation and improving the dosing efficiency. By setting a dosing valve 21, the connection between the dosing hopper 20 and the dosing tank 7 can be controlled. In conjunction with the volume scale of the dosing hopper 20 (or an external measuring tool), the amount of cleaning agent added can be precisely controlled, ensuring that the concentration of the cleaning solution meets the process requirements and avoiding the impact of dosage deviation on the cleaning effect.

[0050] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 1 As shown, the bottom of the medicine preparation tank 7 is equipped with an emptying valve 22 for emptying the medicine preparation tank 7.

[0051] In this embodiment, after the cleaning operation is completed, unused cleaning solution may remain in the preparation tank 7. The drain valve 22, located at the bottom of the tank, allows for the complete removal of any remaining cleaning agent by gravity, preventing long-term retention that could lead to deterioration, crystallization, or corrosion of the tank. Furthermore, when it is necessary to change the type of cleaning agent, the drain valve 22 ensures that the original agent is completely drained, preventing chemical reactions caused by mixing different agents, which could affect subsequent cleaning results or equipment safety.

[0052] Furthermore, to fully illustrate the specific implementation process of this embodiment, a method for cleaning the shell side of an over-the-top condenser is provided, involving... Figure 2As shown, the method includes: Step S101: Close the switching valve 3, open the first control valve 8, the second control valve 9 and the third control valve 10, and add the stripping agent into the preparation tank 7 to prepare the stripping solution.

[0053] Here, closing the switching valve 3 cuts off the normal path of the circulation pipeline, forcing fluid (such as water) into the cleaning pipeline. Opening the first control valve 8 and the second control valve 9 allows fluid to flow between the bypass pipe 4 and the circulating water inlet pipe 1, forming a cleaning circulation path of "bypass pipe 4 → circulating water inlet pipe 1 → over-the-top condenser shell side → circulating return water pipe 2 → bypass pipe 4". Opening the third control valve 10 connects the inlet of the dosing tank 7, allowing part of the fluid from the outlet of the cleaning pump 6 to flow into the dosing tank 7 and mix with the stripping agent. The stripping agent can be added to the dosing tank 7 through the dosing hopper 20. The stripping agent mixes with the flowing water to form a liquid with strong chemical stripping effect, namely the stripping liquid, which is used to break the adhesion between the deposits and the surface of the over-the-top condenser shell side.

[0054] It is understood that the stripping agent in step S101 is the cleaning agent described above, and the stripping liquid is the cleaning liquid described above.

[0055] Step S102: When the stripping fluid reaches the first preset concentration, close the third control valve 10, open the fourth control valve 11, circulate for the first time, and then discharge the stripping medium and deposits.

[0056] Here, the purpose of step S102 is to ensure that the concentration of the stripping fluid meets the standard, and then let it enter the bypass pipe 4 to mix with water to form a stripping medium. The stripping medium is circulated under the drive of the cleaning pump 6 to strip the deposits. Finally, the stripping medium and the stripped deposits are discharged to complete the preliminary cleaning of the shell side of the top condenser.

[0057] In this embodiment, the first preset concentration is 1000 ppm. The concentration of the stripping solution can be confirmed to be 1000 ppm by monitoring the concentration in the dosing tank 7 or by calculating the ratio to ensure the chemical stripping effect.

[0058] In step S101, closing the third control valve 10 stops the injection of water into the dosing tank 7, preventing excessive dilution of the stripping solution and maintaining a stable concentration. Opening the fourth control valve 11 opens the outlet of the dosing tank 7, allowing the stripping solution to be injected into the bypass pipe 4. After mixing with water to form a stripping medium, it circulates in the shell side of the overhead condenser under the drive of the cleaning pump 6. It is understood that this stripping medium is the aforementioned cleaning medium.

[0059] In this embodiment, the initial time is 8 hours. The cleaning pump 6 is started, allowing the stripping medium to circulate for 8 hours along the path of "bypass pipe 4 → circulating water inlet pipe 1 → over-the-top condenser shell side → circulating water return pipe 2 → bypass pipe 4". This process removes deposits through chemical action, while the fluid flushes away the removed deposits. After circulation, the stripping liquid containing sludge is discharged through the drain valve 17, clearing the deposits from the over-the-top condenser shell side.

[0060] Step S103: After the sewage discharge is completed, add water to the shell side of the top condenser.

[0061] Here, the purpose of step S103 is to clean away the residual stripping medium and provide a basic fluid environment for subsequent corrosion and scale inhibition treatment.

[0062] One way to confirm that the stripping medium and sediments have been basically discharged is to observe the clarity of the liquid discharged from the sewage outlet or monitor the water quality.

[0063] Water can be injected into the circulating water inlet pipe 1 through the water injection pipe 12. The water flows through the shell side of the overhead condenser and the circulating water return pipe 2, flushing away residual stripping fluid and fine deposits, while simultaneously replenishing the fluid volume in the device. It should be noted that during the process of replenishing water into the shell side of the overhead condenser, the switching valve 3 is in the closed state, the first control valve 8 and the second control valve 9 are in the open state, and the exhaust valve 19 can also be in the open state.

[0064] Step S104: When the liquid level in the shell side of the top condenser reaches the preset liquid level, open the third control valve 10 and add corrosion and scale inhibitor to the dosing tank 7 to prepare corrosion and scale inhibitor solution.

[0065] Here, the purpose of step S104 is to fill the shell side of the over-the-top condenser with water and then inject a corrosion and scale inhibitor to prevent equipment corrosion and inhibit the formation of new scale, thereby protecting the inner wall of the shell side of the over-the-top condenser.

[0066] The water level in the shell side of the overhead condenser can be confirmed by a level gauge to reach a preset height (such as filling the shell side of the overhead condenser), ensuring that the corrosion and scale inhibitor can be evenly distributed and cover all metal surfaces.

[0067] In step S104, opening the third control valve 10 connects to the inlet of the dosing tank 7, allowing fluid (such as water) from the outlet of the cleaning pump 6 to flow into the dosing tank 7 and mix with the corrosion and scale inhibitor. At this time, the fourth control valve 11 is closed, preventing the corrosion and scale inhibitor solution that has not reached the second preset concentration from flowing into the bypass pipe 4. The corrosion and scale inhibitor can be added to the dosing tank 7 through the dosing hopper 20. The corrosion and scale inhibitor mixes with the flowing water to form a liquid with corrosion and scale inhibition properties, i.e., a corrosion and scale inhibitor solution, used to form a protective film on the inner wall of the shell side of the overhead condenser.

[0068] Step S105: When the corrosion and scale inhibitor solution reaches the second preset concentration, close the third control valve 10, open the fourth control valve 11, circulate for the second time, and then discharge the corrosion and scale inhibitor medium.

[0069] Here, the purpose of step S105 is to ensure that the corrosion and scale inhibitor formed by mixing the corrosion and scale inhibitor with water fully acts on the inner wall of the shell side of the overhead condenser to form a protective film. Then, the corrosion and scale inhibitor is discharged to complete the entire cleaning process.

[0070] In this embodiment, the second preset concentration is 200 ppm. The concentration of the corrosion and scale inhibitor solution reaching 200 ppm can be confirmed by monitoring the concentration in the mixing tank 7 or by calculating the mixing ratio.

[0071] In step S105, closing the third control valve 10 can stop the injection of water into the dosing tank 7, prevent the corrosion and scale inhibitor from being over-diluted, and maintain a stable concentration; opening the fourth control valve 11 can open the outlet of the dosing tank 7, allowing the corrosion and scale inhibitor to be injected into the bypass pipe 4, and after mixing with water to form a corrosion and scale inhibitor medium, it circulates in the shell side of the overhead condenser under the drive of the cleaning pump 6.

[0072] In this embodiment, the initial time is 2 hours. The cleaning pump 6 is started, allowing the corrosion and scale inhibitory medium to circulate for 2 hours along the path of "bypass pipe 4 → circulating water inlet pipe 1 → over-the-top condenser shell side → circulating water return pipe 2 → bypass pipe 4," passivating the inner wall of the over-the-top condenser shell side through chemical action. After circulation is complete, the corrosion and scale inhibitory medium is discharged through the drain valve 17. At this point, the over-the-top condenser shell side has been cleaned and possesses corrosion resistance, allowing normal production to resume.

[0073] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0074] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A top-mounted condenser shell-side cleaning device, characterized in that, include: Circulation piping and cleaning piping; The circulation pipeline includes a circulation inlet pipe and a circulation return pipe. The circulation inlet pipe and the circulation return pipe form a loop that is connected end to end through the shell side of the top condenser. A switching valve is provided on the circulation return pipe. The cleaning pipeline includes a bypass pipe and a dosing pipe. The two ends of the bypass pipe are connected to the inlet pipe and the outlet pipe of the switching valve, respectively, and a cleaning pump is installed on the bypass pipe. The two ends of the dosing pipe are connected to the inlet pipe and the outlet pipe of the cleaning pump, respectively, and a dosing tank is installed on the dosing pipe. The cleaning pump has a first control valve on its inlet pipe, a second control valve on its outlet pipe, a third control valve on its inlet pipe, and a fourth control valve on its outlet pipe.

2. The over-the-top condenser shell-side cleaning device according to claim 1, characterized in that, The circulation pipeline also includes: The water injection pipe is connected to the circulating water inlet pipe, and a water injection valve is provided on the water injection pipe.

3. The over-the-top condenser shell-side cleaning device according to claim 1, characterized in that, The circulation pipeline also includes: A drain pipe is connected to the circulating return water pipe, and a drain valve is provided on the drain pipe.

4. The over-the-top condenser shell-side cleaning device according to claim 1, characterized in that, A one-way valve is provided on the pipeline connecting the circulating water inlet pipe and the circulating water return pipe. The one-way valve is configured to allow fluid in the circulating water return pipe and the bypass pipe to enter the circulating water inlet pipe in one direction only.

5. The over-the-top condenser shell-side cleaning device according to claim 1, characterized in that, The inlet pipe of the cleaning pump is also equipped with a drain valve, which is located upstream of the first control valve along the flow path of the fluid in the inlet pipe of the cleaning pump.

6. The over-the-top condenser shell-side cleaning device according to claim 1, characterized in that, A flow meter is installed on the circulating water inlet pipe to monitor the fluid flow rate inside the circulating water inlet pipe.

7. The over-the-top condenser shell-side cleaning device according to claim 1, characterized in that, The circulating water return pipe is also equipped with an air vent valve, which is located at the apex of the fluid flow path inside the circulating water return pipe.

8. The over-the-top condenser shell-side cleaning device according to claim 1, characterized in that, The top of the medicine preparation tank is connected to a dosing hopper, and a dosing valve is provided on the pipeline connecting the dosing hopper and the medicine preparation tank.

9. The over-the-top condenser shell-side cleaning device according to claim 1, characterized in that, The bottom of the medicine preparation tank is equipped with an emptying valve for emptying the medicine preparation tank.

10. A method for cleaning the shell side of an over-the-top condenser, characterized in that, The method, applied to the over-the-top condenser shell-side cleaning apparatus as described in any one of claims 1-9, comprises: Close the switching valve, open the first control valve, the second control valve and the third control valve, and add stripping agent into the dispensing tank to prepare the stripping solution; When the stripping fluid reaches the first preset concentration, the third control valve is closed and the fourth control valve is opened. After circulating for a first time, the stripping medium and deposits are discharged. After the sewage discharge is completed, water is added to the shell side of the overhead condenser; When the liquid level in the shell side of the overhead condenser reaches the preset level, the third control valve is opened to add corrosion and scale inhibitor to the dosing tank to prepare corrosion and scale inhibitor solution. When the corrosion and scale inhibitor solution reaches the second preset concentration, the third control valve is closed and the fourth control valve is opened. After a second cycle, the corrosion and scale inhibitor medium is discharged.

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