A cleaning method for a hollow paddle cooler

Abstract

This application relates to the field of chemical equipment maintenance, and particularly to a cleaning method for a hollow paddle cooler. The hollow paddle cooler has rotary joints at both ends. The method includes: fixing the elbows connected to the rotary joints upwards; adding descaling agent to the rotary joints until the liquid level reaches a preset height, then continuously adding descaling agent to the rotary joints via high-level discharge, allowing it to stand, and then rotating the hollow paddle cooler to initially corrode the scale inside the hollow paddle cooler; after the initial cleaning is completed, circulating the descaling agent within the hollow paddle cooler and starting the hollow paddle cooler; determining whether to stop the machine based on the descaling agent outflow from the hollow shaft of the hollow paddle cooler; if so, stopping the machine to complete the cleaning of the hollow paddle cooler; this method avoids the inconvenience of disassembling the main shaft for cleaning and allows for a relatively quick restoration of the equipment's cooling capacity.

Description

Technical Field

[0001] This application relates to the field of chemical equipment maintenance, and in particular to a cleaning method for a hollow paddle cooler. Background Technology

[0002] Regardless of water purity, any equipment that uses low-temperature water as a medium to cool materials is at risk of becoming clogged with scale. While typical coolers and evaporators clogged with scale or material buildup are cleaned with strong acid solutions, completely clogged coolers or evaporators often cannot be cleaned with solutions and must be disassembled for cleaning.

[0003] Taking hollow paddle coolers as an example, hollow paddle coolers generally use deionized water as the medium, which can reduce the temperature of ρ-Al2O3 from 180℃ to about 50℃. However, after 47 months of continuous operation, its cooling effect decreased, and it was found that the hollow paddle section was completely blocked. The existing solution is to disassemble the main shaft of the hollow paddle and return it to the factory for processing. Even without considering transportation time and cost, the overall return processing cycle is about 15 days, which will seriously affect the production of industrial enterprises. At the same time, since industrial hollow paddle coolers are generally quite large, it is difficult to disassemble them in a confined space. Therefore, how to clean the blocked hollow paddle cooler without disassembly is a technical problem that urgently needs to be solved. Summary of the Invention

[0004] This application provides a cleaning method for a hollow paddle cooler, which solves the technical problems in the prior art where cleaning a hollow paddle cooler requires time-consuming disassembly of the main shaft and the main shaft disassembly is difficult. The method is fast and low-cost.

[0005] In a first aspect, this application provides a cleaning method for a hollow paddle cooler, wherein the hollow paddle cooler has rotary joints at both ends, and the method includes:

[0006] Fix the elbow of the rotary joint so that it faces upwards;

[0007] Add descaling agent to the elbow connected by the rotary joint until the liquid level in the elbow reaches the preset liquid level height. Then, continue to add the descaling agent to the elbow connected by the rotary joint in a high-level discharge manner and let it stand. Then, turn on the hollow paddle cooler and rotate it slowly to initially corrode the scale inside the hollow paddle cooler.

[0008] After the initial cleaning is completed, the descaling agent is circulated in the hollow paddle cooler, and the hollow paddle cooler is turned on to remove the scale formed by corrosion.

[0009] Determine whether it is necessary to shut down the machine based on the outflow of descaling agent from the hollow shaft of the hollow paddle cooler.

[0010] If so, stop the machine to complete the cleaning of the hollow paddle cooler.

[0011] Optionally, the process involves adding descaling agent to the elbow connected to the rotary joint until the liquid level in the elbow reaches a preset height, then continuously adding the descaling agent to the elbow via high-level discharge, allowing it to stand, and then slowly rotating the hollow paddle cooler to initially corrode the scale inside the hollow paddle cooler. Specifically, this includes:

[0012] Add descaling agent to the elbow connected by the rotary joint until the liquid level in the elbow reaches the preset liquid level height, and then let it stand until the liquid level in the elbow connected by the rotary joint stabilizes.

[0013] Fix the elbow connected to the rotary joint downwards, then continuously add the descaling agent to the elbow connected to the rotary joint in a high-level discharge manner, and allow it to stand. Then turn on the hollow paddle cooler and rotate it for more than 24 hours to initially corrode the scale inside the hollow paddle cooler.

[0014] Optionally, the preset liquid level height is more than 20cm from the bottom end of the elbow connected to the rotary joint.

[0015] Optionally, the high-level discharge includes both natural outflow and high-level discharge in a manner that ensures no overflow at the interface of the elbow connected to the rotary joint.

[0016] Optionally, the rotation speed is above 3.75° / h.

[0017] Optionally, the settling time is ≥4h.

[0018] Optionally, the rotation time is ≥24h.

[0019] Optionally, determining whether to shut down the machine based on the descaling agent outflow from the hollow shaft of the hollow paddle cooler specifically includes:

[0020] Whether or not the descaling agent needs to be discharged from the hollow shaft of the hollow paddle cooler is used to determine whether the machine needs to be shut down.

[0021] If no descaling agent flows out of the hollow shaft outlet, the descaling agent continues to be added to the elbow connected to the rotary joint in a high-level discharge manner.

[0022] If descaling agent flows out of the hollow shaft outlet, it is necessary to determine whether the outflow rate is continuous.

[0023] If cleaning agent continues to flow from the hollow shaft outlet, stop the machine immediately.

[0024] If the cleaning agent flows out of the hollow shaft outlet intermittently and the flow rate of the cleaning agent is small, it will continue to circulate for a preset time, and then stop to complete the cleaning of the hollow paddle cooler.

[0025] Optionally, the preset time is 1 hour to 2 hours.

[0026] Optionally, the cleaning agent is a weakly acidic chemical cleaner for calcium, magnesium, and iron ion scale.

[0027] The technical solutions provided in this application have the following advantages compared with the prior art:

[0028] This application provides a cleaning method for a hollow paddle cooler. Compared to the traditional method of disassembling the main shaft of the hollow paddle cooler, this method only disconnects the inlet and outlet water hoses connecting the two ends of the hollow paddle cooler to the rotating paddle shaft. The descaling agent is introduced through the rotary joints at both ends of the hollow paddle cooler and the elbows connected to these joints. Descaling agent is continuously added for soaking, ensuring that the scale on the hollow paddle section is evenly corroded. The hollow paddle cooler is rotated, and a circulating flow is employed. This not only ensures that the descaling agent thoroughly soaks the blockages in the rotating hollow paddle cooler but also flushes away the corroded scale. The flow of descaling agent is used to determine when to stop the machine, ensuring the cleaning effect. This method avoids the inconvenience of disassembling the main shaft for cleaning, allowing the equipment to quickly regain its cooling capacity and return to production, thus improving the industry's production technology level. Attached Figure Description

[0029] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 A flowchart illustrating the method provided in the embodiments of this application;

[0032] Figure 2 A detailed flowchart illustrating the method provided in the embodiments of this application. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this application can be purchased from the market or prepared by existing methods.

[0035] The inventive concept of this application is as follows: Due to the complex internal structure of the main shaft and blades of the hollow paddle cooler, the corresponding manufacturer's solution is that if it becomes completely blocked, the main shaft must be disassembled and transported back to the manufacturer for disassembly and unblocking, and then transported back for installation, which takes about 15 days and costs about 120,000 yuan. Furthermore, the equipment is located in an environment less than 1 meter from the upper floor. Therefore, if conventional methods are used to disassemble the equipment without damaging the floor slab, and transport it out... It is almost impossible to have two main shafts on the left and right.

[0036] This application provides a cleaning method for a hollow paddle cooler, wherein the hollow paddle cooler has rotary joints at both ends, and the method includes:

[0037] S1. Fix the elbow of the rotary joint so that it faces upwards;

[0038] S2. Add descaling agent to the elbow connected by the rotary joint until the liquid level in the elbow reaches the preset liquid level height. Then, continuously add the descaling agent to the elbow connected by the rotary joint in a high-level discharge manner, and let it stand. Then rotate the hollow paddle cooler to initially corrode the scale inside the hollow paddle cooler.

[0039] S3. After the initial cleaning is completed, the descaling agent is circulated in the hollow paddle cooler, and the hollow paddle cooler is turned on to remove the scale formed by corrosion.

[0040] S4. Determine whether it is necessary to stop the machine based on the outflow of descaling agent from the hollow shaft in the hollow paddle cooler;

[0041] If so, stop the machine to complete the cleaning of the hollow paddle cooler.

[0042] like Figure 2As shown, in some optional embodiments, the process involves adding descaling agent to the elbow connected to the rotary joint until the liquid level in the elbow reaches a preset height, then continuously adding the descaling agent to the elbow via high-level discharge, allowing it to stand, and then rotating the hollow paddle cooler to initially corrode the scale inside the hollow paddle cooler. Specifically, this includes:

[0043] S201. Add descaling agent to the elbow connected by the rotary joint until the liquid level in the elbow reaches the preset liquid level height, and then let it stand until the liquid level in the elbow connected by the rotary joint stabilizes.

[0044] S202. Fix the elbow connected to the rotary joint downwards, then continuously add the descaling agent to the elbow connected to the rotary joint in a high-level discharge manner, and allow it to stand. Then turn on the hollow paddle cooler and rotate it for more than 24 hours to initially corrode the scale inside the hollow paddle cooler.

[0045] In this embodiment, by first adding descaling agent to the rotary joint and limiting the liquid level, it is ensured that the descaling agent is completely immersed in the blocked hollow shaft. Then, by adjusting the position of the rotary joint, it is possible to facilitate the subsequent discharge of the descaling agent through the hollow shaft after the scale has been completely corroded. This ensures the initial corrosion of the scale by the descaling agent and facilitates subsequent circulation.

[0046] In some optional embodiments, the preset liquid level height is more than 20cm from the bottom end of the elbow connected to the rotary joint.

[0047] In this embodiment, the preset liquid level height is defined to ensure that the hollow shaft of the hollow paddle cooler is filled with descaling agent, thereby ensuring the cleaning effect of the descaling agent.

[0048] In some alternative implementations, the high-level discharge includes natural outflow and high-level discharge in a manner that ensures no overflow at the interface of the elbow connected to the rotary joint.

[0049] In this embodiment of the application, the specific high-level discharge method is defined to ensure that the descaling agent completely enters the hollow shaft and ensures that the scale is completely cleaned.

[0050] In some alternative implementations, the rotation speed is above 3.75° / h.

[0051] In this embodiment of the application, the rotational speed of the rotating hollow paddle cooler is limited to ensure that the descaling agent can flow through all parts of the hollow shaft, thereby ensuring that the scale in all parts of the hollow shaft is fully corroded, which facilitates subsequent circulation to wash away the scale.

[0052] In some alternative implementations, the settling time is ≥4 hours.

[0053] In this embodiment of the application, the positive effect of limiting the settling time to ≥4h is that within this time range, the scale in the hollow shaft can be fully corroded, which facilitates the subsequent circulation to wash away the scale.

[0054] In some alternative implementations, the rotation time is ≥24h.

[0055] In this embodiment, the rotation time is limited to more than 24 hours, which ensures that the descaling agent can flow through all parts of the hollow shaft, thereby ensuring the descaling agent's corrosive cleaning effect on the structure and facilitating subsequent circulation to wash away the scale.

[0056] like Figure 2 As shown, in some optional embodiments, determining whether to shut down the machine based on the outflow of descaling agent from the hollow shaft of the hollow paddle cooler specifically includes:

[0057] S401. Determine whether it is necessary to stop the machine based on whether the descaling agent flows out of the hollow shaft in the hollow paddle cooler;

[0058] If no descaling agent flows out of the hollow shaft outlet, the descaling agent continues to be added to the elbow connected to the rotary joint in a high-level discharge manner.

[0059] If descaling agent flows out of the hollow shaft outlet, it is necessary to determine whether the outflow rate is continuous.

[0060] If cleaning agent continues to flow from the hollow shaft outlet, stop the machine immediately.

[0061] If the cleaning agent flows out of the hollow shaft outlet intermittently and the flow rate of the cleaning agent is small, it will continue to circulate for a preset time, and then stop to complete the cleaning of the hollow paddle cooler.

[0062] In this embodiment of the application, by further refining the criteria for determining whether the descaling agent flows out of the rotary joint or the elbow connected to the rotary joint and whether the machine stops, the unobstructed flow inside the hollow shaft after cleaning with the descaling agent can be guaranteed, thereby ensuring the cleaning effect of the descaling agent.

[0063] In some optional implementations, the preset time is 1 hour to 2 hours.

[0064] In this embodiment of the application, the positive effect of limiting the preset time to 1h to 2h is that within this preset time range, since the cleaning flow is intermittent and the flow rate is small, it indicates that there is some scale blockage in the hollow shaft after corrosion. Therefore, the circulation continues to flush out the blockage scale, thereby ensuring the cleaning effect.

[0065] In some alternative embodiments, the cleaning agent is a weakly acidic chemical cleaner for calcium, magnesium, and iron ion scale.

[0066] In this embodiment, since the hollow blades are made of ordinary carbon steel, directly using a strong acid descaling agent would inevitably affect the structure of the hollow blades. Therefore, the cleaning agent is limited to a weak acid chemical cleaning agent that targets calcium, magnesium and iron ion scale, which can avoid corrosion damage to the hollow blades and also corrode the scale, thereby cleaning the hollow blade cooler without damaging the equipment.

[0067] The descaling solution has a pH of approximately 6.5, making it slightly acidic overall. It does not cause burning or corrosive sensations when applied to the skin.

[0068] The present application is further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the application. Experimental methods in the following embodiments that do not specify specific conditions are generally determined according to national standards. If there is no corresponding national standard, then general international standards, conventional conditions, or conditions recommended by the manufacturer are followed.

[0069] Example 1

[0070] The factory uses a 5W model with a volume of 20m². 3 A hollow paddle cooler with a processing capacity of 1 t / h, a hollow main shaft diameter of 50 mm, and a paddle diameter of 600 mm completely lost its cooling capacity after 47 months of normal operation. Inspection revealed that the hollow shaft of the cooler was completely blocked. The above-mentioned method was used to repair it, with the following specific steps:

[0071] Step 1: Disconnect the flexible metal tubes connecting the two ends of the shaft to the rotary joint, and fix the elbow connected to the rotary joint with the outlet facing upwards;

[0072] Step 2: Purchase GL010 descaling agent (25Kg / barrel, 15 barrels) from Shandong Aike Water Treatment Technology Co., Ltd. for calcium, magnesium and iron ion scaling. Use a funnel to add the descaling agent into the hollow shaft from both ends of the rotary joint until the liquid level in the rotary joint is 20cm. At this point, the hollow shaft can be considered to be full of descaling agent. Then let it stand and soak for 4 hours or more.

[0073] Step 3: After soaking is complete, bubbles will emerge from the rotary joint and the descaling agent level will drop. With the rotary joint facing downwards, continuously add descaling agent to the rotary joint by high-level discharge (natural discharge, control the flow rate, and make sure there is no overflow at the rotary joint). Every 4 hours or so, turn on the paddle cooler to rotate the hollow paddle blades at a certain angle (close to 15°) and continue this for 24 hours.

[0074] Step 4: After 24 hours, prepare a plastic bucket of about 180L, a corrosion-resistant pump with a flow rate of 30L / m, 40-50m of φ30mm steel wire plastic pipe, and two φ30mm to φ50mm reducers, welded to φ50mm flanges, and connected to the flanges at both ends of the hollow impeller's rotating shaft. Install the pump and pipes to form a loop where the pump pumps out the descaling agent, which enters the hollow impeller's rotating shaft and then flows back to the plastic bucket from the shaft outlet. After connecting the power supply, start the corrosion-resistant pump to circulate the descaling agent between the hollow impeller's rotating shaft and the plastic bucket. During the pump's operation, turn on the cooler to rotate the hollow impeller and flush out the scale that has corroded away in the previous 24 hours.

[0075] Step 5: If no descaling agent flows out of the hollow blade rotating shaft outlet, repeat step 3; if descaling agent flows out, but the descaling agent is intermittent and the amount is small, stop the circuit after about 2 hours.

[0076] Step 6: Remove the flange used for circulation at the rotary joint, and repeat steps 3 and 4.

[0077] Example 2

[0078] Comparing Example 2 with Example 1, the difference between Example 2 and Example 1 is as follows:

[0079] Step 4: After 24 hours, prepare a plastic bucket of approximately 180L, a corrosion-resistant pump with a flow rate of 30L / m, 40-50m of φ30mm steel wire plastic pipe, and two φ30mm to φ50mm reducers, welded to φ50mm flanges, and connected to the flanges at both ends of the hollow impeller's rotating shaft. Install the pump and pipes to form a loop where the pump pumps out the descaling agent, which enters the hollow impeller's rotating shaft and then flows back to the plastic bucket from the shaft outlet. After connecting the power supply, start the corrosion-resistant pump to circulate the descaling agent between the hollow impeller's rotating shaft and the plastic bucket. During pump operation, turn on the cooler and let the hollow impeller rotate for 1-2 hours, then stop the pump.

[0080] Example 3

[0081] Comparing Example 3 and Example 2, the differences between Example 3 and Example 2 are as follows:

[0082] Step 6: Disconnect the flange connected to the rotary joint, continue to add cleaning solution to the hollow shaft and soak for 24 hours, then reinstall the circulation pipe and circulate; repeat this process 3-5 times until the liquid output from the hollow shaft outlet is large and the flow rate remains basically unchanged when the shaft rotates. The cleaning is complete, and the original circulation water pipe can be restored and the equipment can be put into operation.

[0083] The hollow paddle cooler cleaned in Example 3 was put into actual production and reduced the temperature of ρ-Al2O3 from 180°C to about 50°C. The problem of scalding the packaging bags during packaging no longer occurred, and the original effect of the equipment was fully achieved.

[0084] One or more technical solutions in the embodiments of this application have at least the following technical effects or advantages:

[0085] (1) The cleaning method of the hollow paddle cooler provided in this application embodiment does not disassemble the two rotating paddles of the hollow paddle cooler. It only disconnects the inlet and outlet water hoses connected to the rotating paddle shaft at both ends of the hollow paddle cooler and then uses chemical cleaning to solve the problem of hollow paddle blockage. The process is simple, the equipment investment cost is small, and the application evaluation effect is good.

[0086] (2) The cleaning method of the hollow paddle cooler provided in this application embodiment selects a weakly acidic descaling agent. At the same time, considering that the hollow paddle is completely blocked by scale, a continuous soaking method is adopted, and the hollow paddle is rotated continuously during the soaking process to ensure that the hollow paddle part is corroded as evenly as possible.

[0087] (3) The cleaning method of a hollow paddle cooler provided in this application embodiment takes into account that the scale that is corroded may not be completely dissolved by the cleaning solution. A corrosion-resistant pump is used to circulate the solution in a timely manner to remove the scale fragments generated inside the hollow paddle.

[0088] (4) The cleaning method of the hollow paddle cooler provided in this application embodiment uses a descaling agent specifically for calcium and magnesium ion scaling, which has a good corrosive effect on the scale formed inside the hollow paddle. After repeated operations of continuous soaking → circulation → soaking again → circulation for one week, the completely blocked hollow paddle is successfully cleared and its original cooling capacity can be restored.

[0089] (5) The cleaning method for a hollow paddle cooler provided in this application embodiment allows the used descaling agent to be stored in a container for future use after sedimentation and clarification. The precipitated scale residue, mainly composed of calcium, magnesium, and iron, can be discharged as normal solid waste, thus meeting the requirements of a green circular economy.

[0090] Various embodiments of this application may exist in the form of a range; it should be understood that the description in the form of a range is merely for convenience and brevity and should not be construed as a hard limitation on the scope of this application; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single numerical values ​​within that range. For example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., and single numbers within the range, such as 1, 2, 3, 4, 5, and 6, regardless of the range. Furthermore, whenever a numerical range is referred to herein, it means including any referenced number (fraction or integer) within the referred range.

[0091] In this application, unless otherwise stated, directional terms such as "upper" and "lower" specifically refer to the orientation shown in the accompanying drawings. Furthermore, in the description of this application, the terms "comprising," "including," etc., mean "including but not limited to."

[0092] In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying any actual relationship or order between these entities or operations. In this document, "and / or" describes the association between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. A and B can be singular or plural. In this document, "at least one" means one or more, and "more than" means two or more. "At least one," "at least one of the following," or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, "at least one of a, b, or c," or "at least one of a, b, and c," can both represent: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can be single or multiple.

[0093] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for cleaning a completely clogged hollow shaft in a hollow paddle cooler, wherein the hollow paddle cooler has rotary joints at both ends, characterized in that... The method includes: Fix the elbow of the rotary joint so that it faces upwards; Add descaling agent to the elbow connected by the rotary joint until the liquid level in the elbow reaches the preset liquid level height, and then let it stand until the liquid level in the elbow stabilizes. Fix the elbow connected to the rotary joint downwards, then continuously add the descaling agent to the elbow connected to the rotary joint in a high-level discharge manner, and let it stand. Then turn on the hollow paddle cooler and rotate it for more than 24 hours to initially corrode the scale inside the hollow paddle cooler. After the initial corrosion is completed, the descaling agent is circulated in the hollow paddle cooler, and the hollow paddle cooler is turned on to remove the scale formed after corrosion. Determine whether it is necessary to shut down the machine based on the outflow of descaling agent from the hollow shaft of the hollow paddle cooler. If so, stop the machine to complete the cleaning of the hollow paddle cooler; The preset liquid level height is more than 20cm from the bottom end of the elbow connected to the rotary joint; The rotation speed is above 3.75° / h, and the settling time is ≥4h; The descaling agent is a weakly acidic chemical descaling agent with a pH of 6.5, which is effective against calcium, magnesium, and iron ion scale formation. The step of determining whether to shut down the machine based on the outflow of descaling agent from the hollow shaft of the hollow paddle cooler specifically includes: Whether or not the descaling agent needs to be discharged from the hollow shaft of the hollow paddle cooler is used to determine whether the machine needs to be shut down. If no descaling agent flows out of the hollow shaft outlet, the descaling agent continues to be added to the elbow connected to the rotary joint in a high-level discharge manner. If descaling agent flows out of the hollow shaft outlet, it is necessary to determine whether the outflow rate is continuous. If descaling agent continues to flow from the hollow shaft outlet, the machine should be stopped immediately. If the descaling agent flows out of the hollow shaft outlet intermittently and the flow rate of the descaling agent is small, it will continue to circulate for a preset time, and then stop to complete the cleaning of the hollow paddle cooler.

2. The cleaning method according to claim 1, characterized in that, The high-level discharge includes both natural outflow and high-level discharge in a manner that ensures no overflow at the interface of the elbow connected to the rotary joint.

3. The cleaning method according to claim 1, characterized in that, The preset time is 1 hour to 2 hours.

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