Internal circulation pickling device and method for circulation loop pipeline

Abstract

The invention provides an internal circulation pickling device and method for a circulation loop pipeline, and the internal circulation pickling device comprises a corrosion-resistant circulating pump, a to-be-treated hydraulic pipeline and a liquid storage tank group which are sequentially connected through a pipeline; wherein the oil supply pipe end and the oil return pipe end of the hydraulic pipeline to be treated form a closed circulation loop through the temporary connecting pipeline; the liquid storage tank group comprises an acid liquid raw material barrel, a clear water barrel and a passivation liquid raw material barrel which are arranged in parallel, outlet pipelines of the acid liquid raw material barrel, the clear water barrel and the passivation liquid raw material barrel are respectively communicated with the liquid supply header pipe through valves, and inlet pipelines of the acid liquid raw material barrel, the clear water barrel and the passivation liquid raw material barrel are respectively communicated with the backflow header pipe through valves; an outlet of the liquid supply header pipe is communicated with an inlet of the corrosion-resistant circulating pump, an outlet of the corrosion-resistant circulating pump is communicated with a first connector of the three-way switching valve, a second connector of the three-way switching valve is communicated with the oil supply pipe end of the hydraulic pipeline to be treated, and the oil return pipe end of the hydraulic pipeline to be treated is communicated with the backflow header pipe through valves.

Description

Technical Field

[0001] The present invention belongs to the technical field of hydraulic pipeline treatment, and particularly relates to an internal circulation pickling device and method for a circulating loop pipeline. Background Art

[0002] In the current hydraulic pipeline installation work, the pickling of pipelines mainly relies on the traditional method of making a pickling tank, pouring pickling solution into the tank, and then immersing the whole pipeline raw material in the tank. After pickling is completed, the pipeline is hoisted into a water tank for cleaning, and then into a passivation tank for passivation. This method not only requires a large amount of manual and mechanical cooperation, but also has problems such as difficult acid liquid recovery, serious material waste, and large environmental pollution. Especially for large or complex hydraulic systems, it is difficult to achieve comprehensive and effective pickling by traditional methods, and the consistency of the inner wall treatment of the pipeline cannot be guaranteed.

[0003] Therefore, there is an urgent need to find a pickling method that saves materials, labor, and is environmentally friendly, which plays an important role in reducing costs and shortening the construction period for the installation projects of hydraulic pipelines and other circulating pipelines. Summary of the Invention

[0004] The present invention provides an internal circulation pickling device and method for a circulating loop pipeline, which are used to solve the problems of material waste, manual labor, mechanical equipment, and environmental pollution existing in the existing pipeline pickling process.

[0005] In the first aspect, the present invention provides an internal circulation pickling device for a circulating loop pipeline, including: a corrosion-resistant circulating pump, a hydraulic pipeline to be processed, and a liquid storage tank group, which are sequentially connected by pipelines; Wherein, the oil supply pipe end and the oil return pipe end of the hydraulic pipeline to be processed form a closed circulation loop through a temporary connection pipeline; The liquid storage tank group includes an acid liquid raw material tank, a clear water tank, and a passivation liquid raw material tank arranged in parallel. The outlet pipelines of the acid liquid raw material tank, the clear water tank, and the passivation liquid raw material tank are respectively connected to a liquid supply main pipe through valves, and the inlet pipelines of the acid liquid raw material tank, the clear water tank, and the passivation liquid raw material tank are respectively connected to a reflux main pipe through valves; The outlet of the liquid supply main pipe is connected to the inlet of the corrosion-resistant circulating pump, the outlet of the corrosion-resistant circulating pump is connected to the first interface of a three-way switching valve, the second interface of the three-way switching valve is connected to the oil supply pipe end of the hydraulic pipeline to be processed, and the oil return pipe end of the hydraulic pipeline to be processed is respectively connected to the reflux main pipe through valves.

[0006] Compared with the prior art, the beneficial effects of the present invention are as follows: A complete set of on-line circulating pickling system for hydraulic pipelines is constructed. By temporarily connecting pipelines to form a closed circulation loop, pickling, rinsing and passivation treatments can be realized without disassembling the pipelines. The acid solution tank, the clear water tank and the passivation solution tank are arranged in parallel, and the switching of different treatment processes is realized through valve control, which greatly improves the working efficiency, reduces the workload and time cost brought by the traditional tank pickling that requires pipeline disassembly, reduces the waste of materials, saves labor and mechanical costs, and reduces environmental pollution.

[0007] Further, the third interface of the three-way switching valve is communicated with the compressed air supply pipeline.

[0008] Further, the outlet pipeline of the acid liquid raw material barrel is communicated with the liquid supply main pipe through the acid liquid supply valve, the outlet pipeline of the clear water barrel is communicated with the liquid supply main pipe through the clear water supply valve, and the outlet pipeline of the passivation liquid raw material barrel is communicated with the liquid supply main pipe through the passivation liquid supply valve.

[0009] Further, the inlet pipeline of the acid liquid raw material barrel is communicated with the return main pipe through the acid liquid return valve, the inlet pipeline of the clear water barrel is communicated with the return main pipe through the clear water return valve, and the inlet pipeline of the passivation liquid raw material barrel is communicated with the return main pipe through the passivation liquid return valve.

[0010] Further, the temporarily connected pipeline is made of acid-resistant stainless steel pipe, and flange connectors are equipped at both ends, which are adapted to the flange interfaces of the hydraulic pipeline to be treated.

[0011] Further, in the working state, the oil supply end of the hydraulic pipeline to be treated is communicated with the hydraulic pump station and the hydraulic valve platform, and the oil return end is communicated with the hydraulic actuator.

[0012] In the second aspect, the present invention provides an internal circulating pickling method for a circulating loop pipeline, which is carried out by using the internal circulating pickling device for a circulating loop pipeline described in the first aspect, and includes the following steps: S1. Connect the oil supply end and the oil return end of the hydraulic pipeline to be treated through a temporarily connected pipeline to form a closed circulation loop; S2. Start the corrosion-resistant circulating pump to make the acid solution enter the hydraulic pipeline to be treated and circulate for pickling treatment; S3. After the pickling treatment is completed, switch the valve to make the clear water enter the hydraulic pipeline to be treated and circulate to wash the acid solution in the pipeline clean; S4. Switch the valve to make the passivation solution enter the hydraulic pipeline to be treated and circulate for passivation treatment; S5. After the passivation treatment is completed, turn off the corrosion-resistant circulating pump, and blow the residual liquid in the pipeline back to the passivation liquid raw material barrel through compressed air; S6. Remove the temporarily connected pipeline and restore the connection between the hydraulic pipeline to be treated and the original system. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic diagram of the internal circulation pickling device in an embodiment of the present invention; Figure 2 Partial enlarged schematic diagram of the internal circulation pickling device in an embodiment of the present invention; Figure 3 Partial enlarged schematic diagram of the internal circulation pickling device in an embodiment of the present invention; Figure 4 Partial enlarged schematic diagram of the internal circulation pickling device in an embodiment of the present invention; Figure 5 Partial enlarged schematic diagram of the internal circulation pickling device in an embodiment of the present invention.

[0014] Description of reference numerals: 1. Hydraulic pump station; 2. Hydraulic valve platform; 3. Hydraulic actuator; 4. Corrosion-resistant circulation pump; 5. Acid liquid raw material barrel; 6. Clean water barrel; 7. Passivation liquid raw material barrel; 8. Temporary connection pipeline; 9. Three-way switching valve; 10. Liquid supply main pipe; 11. Return main pipe; 12. Hydraulic pipeline to be processed; 13. Acid liquid supply valve; 14. Acid liquid return valve; 15. Clean water supply valve; 16. Clean water return valve; 17. Passivation liquid supply valve; 18. Passivation liquid return valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts fall within the scope of protection of the present invention.

[0016] Please refer to Figures 1 to 5 , in a first aspect, the present invention provides an internal circulation pickling device for a circulation loop pipeline, including: a corrosion-resistant circulation pump 4, a hydraulic pipeline 12 to be processed, and a liquid storage tank group connected in sequence through pipelines; Among them, the oil supply end and the oil return end of the hydraulic pipeline 12 to be processed form a closed circulation loop through a temporary connection pipeline 8; The liquid storage tank group includes an acid liquid raw material barrel 5, a clean water barrel 6, and a passivation liquid raw material barrel 7 arranged in parallel. The outlet pipelines of the acid liquid raw material barrel 5, the clean water barrel 6, and the passivation liquid raw material barrel 7 are respectively connected to the liquid supply main pipe 10 through valves, and the inlet pipelines of the acid liquid raw material barrel 5, the clean water barrel 6, and the passivation liquid raw material barrel 7 are respectively connected to the return main pipe 11 through valves; The outlet of the main liquid supply pipe 10 is connected to the inlet of the corrosion-resistant circulating pump 4. The outlet of the corrosion-resistant circulating pump 4 is connected to the first interface of the three-way switching valve 9. The second interface of the three-way switching valve 9 is connected to the oil supply pipe end of the hydraulic pipeline 12 to be processed. The oil return pipe end of the hydraulic pipeline 12 to be processed is respectively connected to the main return pipe 11 through valves.

[0017] The in-circulation pickling device for the circulating loop pipeline provided by the present invention constructs a complete on-line circulating pickling system for hydraulic pipelines. A closed circulating loop is formed through temporary connecting pipelines, realizing pickling, rinsing and passivation treatments without disassembling the pipelines. The acid solution tank, the clear water tank and the passivation solution tank are arranged in parallel, and the switching of different treatment processes is realized through valve control, greatly improving the working efficiency, reducing the workload and time cost brought by the traditional tank pickling which requires pipeline disassembly, reducing material waste, saving labor and mechanical costs, and reducing environmental pollution.

[0018] Further, the third interface of the three-way switching valve 9 is connected to the compressed air supply pipeline. After the treatment is completed, the third interface of the reserved three-way switching valve 9 is used as a compressed air valve to connect compressed air, and the residual liquid in the pipeline is thoroughly purged with compressed air to ensure the dryness inside the pipeline and avoid the influence of the residual liquid on the operation of the subsequent hydraulic system.

[0019] Specifically, the outlet pipeline of the acid liquid raw material barrel 5 is connected to the main liquid supply pipe 10 through the acid liquid supply valve 13. The outlet pipeline of the clear water barrel 6 is connected to the main liquid supply pipe 10 through the clear water supply valve 15. The outlet pipeline of the passivation liquid raw material barrel 7 is connected to the main liquid supply pipe 10 through the passivation liquid supply valve 17. The inlet pipeline of the acid liquid raw material barrel 5 is connected to the main return pipe 11 through the acid liquid return valve 14. The inlet pipeline of the clear water barrel 6 is connected to the main return pipe 11 through the clear water return valve 16. The inlet pipeline of the passivation liquid raw material barrel 7 is connected to the main return pipe 11 through the passivation liquid return valve.

[0020] Optionally, the temporary connecting pipeline 8 is made of acid-resistant stainless steel pipe, and flange connectors are equipped at both ends, which are adapted to the flange interfaces of the hydraulic pipeline 12 to be processed.

[0021] It can be understood that in the working state, the oil supply pipe end of the hydraulic pipeline 12 to be processed is connected to the hydraulic pump station 1 and the hydraulic valve platform 2, and the oil return pipe end is connected to the hydraulic actuator 3. During the treatment, it is necessary to isolate the pipeline to be processed from other parts of the hydraulic system, which further protects the hydraulic pump station 1, the valve platform and the actuator from the influence of the acid solution and ensures that the treatment process will not damage the key components of the hydraulic system.

[0022] Among them, the hydraulic actuator 3 is a hydraulic cylinder.

[0023] Second aspect, the present invention provides an internal circulation pickling method for a circulation loop pipeline, which is carried out by using the internal circulation pickling device for a circulation loop pipeline described in the first aspect, and includes the following steps: S1. Connect the oil supply pipe end and the oil return pipe end of the hydraulic pipeline 12 to be processed through a temporary connection pipeline 8 to form a closed circulation loop; S2. Start the corrosion-resistant circulation pump 4 to make the pickling solution enter the hydraulic pipeline 12 to be processed and circulate for pickling treatment; S3. After the pickling treatment is completed, switch the valve to make clean water enter the hydraulic pipeline 12 to be processed and circulate to clean the acid solution in the pipeline; S4. Switch the valve to make the passivation solution enter the hydraulic pipeline 12 to be processed and circulate for passivation treatment; S5. After the passivation treatment is completed, turn off the corrosion-resistant circulation pump 4, and blow the residual liquid in the pipeline back to the passivation solution raw material barrel 7 through compressed air; S6. Remove the temporary connection pipeline 8 and restore the connection between the hydraulic pipeline 12 to be processed and the original system.

[0024] During use, first separate the oil supply pipe and the oil return pipe of the hydraulic pipeline 12 to be processed from the hydraulic equipment, and form a closed circulation loop through the temporary connection pipeline 8; start the corrosion-resistant circulation pump 4, and open the acid solution supply valve 13 and the acid solution return valve 14 at the outlet and inlet of the acid solution raw material barrel 5; after the timed pickling time ends to achieve the pickling effect, close the acid solution supply valve 13 and the acid solution return valve 14, and open the clean water supply valve 15 and the clean water return valve 16 at the outlet and inlet of the clean water barrel 6 to clean the acid solution in the pipeline after pickling; Close the clean water supply valve 15 and the clean water return valve 16, open the passivation solution supply valve 17 and the passivation solution return valve 18 at the outlet and inlet of the passivation solution raw material barrel 7, pump the passivation solution into the pipeline, and start the passivation work; After the passivation work is completed, turn off the corrosion-resistant circulation pump 4, connect compressed air with the reserved compressed air valve, open the valve to blow out the passivation solution remaining in the pipeline system from the pipeline, and the passivation work ends; Remove the temporary pipeline, and restore the connection between the passivated pipeline and the hydraulic pump station 1, hydraulic valve platform 2, hydraulic cylinder and other equipment of the original hydraulic system.

[0025] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; if these modifications and variations fall within the scope of the claims of the present invention and its equivalent technologies, they should all be considered as the protection scope of the present invention.

Claims

1. An internal circulation pickling device for a circulating loop pipeline, characterized in that, Comprising: A corrosion-resistant circulation pump, a hydraulic pipeline to be processed, and a liquid storage tank group connected in sequence through pipelines; Wherein, the oil supply pipe end and the oil return pipe end of the hydraulic pipeline to be processed form a closed circulation loop through a temporary connection pipeline; The liquid storage tank group includes an acid liquid raw material tank, a clear water tank, and a passivation liquid raw material tank arranged in parallel. The outlet pipelines of the acid liquid raw material tank, the clear water tank, and the passivation liquid raw material tank are respectively connected to the liquid supply main pipe through valves, and the inlet pipelines of the acid liquid raw material tank, the clear water tank, and the passivation liquid raw material tank are respectively connected to the return main pipe through valves; The outlet of the liquid supply main pipe is connected to the inlet of the corrosion-resistant circulation pump, the outlet of the corrosion-resistant circulation pump is connected to the first interface of the three-way switching valve, the second interface of the three-way switching valve is connected to the oil supply pipe end of the hydraulic pipeline to be processed, and the oil return pipe end of the hydraulic pipeline to be processed is respectively connected to the return main pipe through valves.

2. The internal circulation pickling device for the circulating loop pipeline according to claim 1, characterized in that, The third interface of the three-way switching valve is connected to the compressed air supply pipeline.

3. The internal circulation pickling device for the circulating loop pipeline according to claim 1, characterized in that The outlet pipeline of the acid liquid raw material tank is connected to the liquid supply main pipe through an acid liquid supply valve, the outlet pipeline of the clear water tank is connected to the liquid supply main pipe through a clear water supply valve, and the outlet pipeline of the passivation liquid raw material tank is connected to the liquid supply main pipe through a passivation liquid supply valve.

4. The internal circulation pickling device for the circulating loop pipeline according to claim 1, characterized in that, The inlet pipeline of the acid liquid raw material tank is connected to the return main pipe through an acid liquid return valve, the inlet pipeline of the clear water tank is connected to the return main pipe through a clear water return valve, and the inlet pipeline of the passivation liquid raw material tank is connected to the return main pipe through a passivation liquid return valve.

5. The internal circulation pickling device for the circulating loop pipeline according to claim 1, characterized in that, The temporary connection pipeline is made of acid-resistant stainless steel pipe, and is equipped with flange connectors at both ends, which are adapted to the flange interfaces of the hydraulic pipeline to be processed.

6. The internal circulation pickling device for the circulating loop pipeline according to any one of claims 1-5, characterized in that, Under the working state, the oil supply pipe end of the hydraulic pipeline to be processed is connected to the hydraulic pump station and the hydraulic valve platform, and the oil return pipe end is connected to the hydraulic actuator.

7. An internal circulation pickling method for a circulating loop pipeline, characterized in that, It is carried out by using the internal circulation pickling device of the circulation loop pipeline described in any one of claims 1-6, including the following steps: S1. Connect the oil supply pipe end and the oil return pipe end of the hydraulic pipeline to be processed through a temporary connection pipeline to form a closed circulation loop; S2. Start the corrosion-resistant circulation pump to make the pickling solution enter the hydraulic pipeline to be processed and circulate for pickling treatment; S3. After the pickling treatment is completed, switch the valve to make clear water enter the hydraulic pipeline to be processed and circulate to clean the acid liquid in the pipeline; S4. Switch the valve to make the passivation liquid enter the hydraulic pipeline to be processed and circulate for passivation treatment; S5. After the passivation treatment is completed, turn off the corrosion-resistant circulation pump, and blow the residual liquid in the pipeline back to the passivation liquid raw material tank through compressed air; S6. Remove the temporary connection pipeline and restore the connection between the hydraulic pipeline to be processed and the original system.

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