Chemical cleaning device

Abstract

The invention discloses a chemical cleaning device which comprises a demineralized water pipeline, a dosing device, a cleaning box, a confluence mother pipe, an outlet filter, cleaned equipment, an auxiliary steam pipeline, a heater, a pipeline pump, a first waste liquid tank, a second waste liquid tank, a catch basin and a water return mother pipe, and the device can meet the chemical cleaning requirement of a nuclear power unit.

Description

Technical Field

[0001] This invention belongs to the field of chemical cleaning in nuclear power plants and relates to a chemical cleaning device. Background Technology

[0002] Chemical cleaning technology utilizes low-concentration media such as citric acid, EDTA, organic acids, or inorganic acids, and uses circulating pumps as power to remove various impurities or oxides remaining in power plant system pipelines during manufacturing, installation, and storage. This is an important means of improving equipment cleanliness and has been widely applied to many important equipment, including steam and water pipelines in thermal power plants, achieving excellent economic and safety benefits.

[0003] Chemical cleaning equipment commonly used in thermal power plants is often crudely designed, with an unreasonable circulation system that causes uneven flow rates. This leads to inconsistent cleaning solution concentrations in water-cooled wall tubes and headers, and the accumulation of shed dirt can potentially cause tube ruptures. Heating performance is also unstable: traditional surface heaters or mixing heaters struggle to maintain a constant temperature, especially during low-temperature cleaning, resulting in temperature fluctuations that affect the effectiveness of chemical cleaning. Waste liquid from chemical cleaning in thermal power plants can be discharged into the boiler for combustion, reducing waste liquid treatment costs. Furthermore, incomplete rinsing of blind areas after chemical cleaning results in prolonged periods of time required for the unit to meet water quality standards during startup.

[0004] Currently, chemical cleaning of nuclear power steam and feedwater pipelines is limited to units using direct-flow steam generators. Furthermore, in order to meet the high standards of chemical cleaning for nuclear power units and current stringent environmental policies, the aforementioned chemical cleaning devices can no longer meet the requirements of chemical cleaning. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a chemical cleaning device that can meet the requirements of chemical cleaning of nuclear power units.

[0006] To achieve the above objectives, the present invention discloses a chemical cleaning device comprising a demineralized water pipeline, a dosing device, a cleaning tank, a manifold, an outlet filter, the equipment to be cleaned, an auxiliary steam pipeline, a heater, a pipeline pump, a first waste liquid tank, a second waste liquid tank, a rainwater well, and a return water manifold. The outlet of the demineralized water pipeline is connected to the inlet of the dosing device and the inlet of the cleaning tank. The outlet of the cleaning tank is connected to the inlet of the manifold. The outlet of the manifold is connected to the inlet of the outlet filter. The outlet of the outlet filter is connected to the equipment being cleaned. The drain outlet of the equipment being cleaned and the outlet of the auxiliary steam pipeline are connected together through a pipe to the pipe-side inlet of the heater and the inlet of the pipeline pump. The drain outlet of the cleaning tank is connected to the inlet of the pipeline pump, and the outlet of the pipeline pump is connected to the No. 1 waste liquid tank, the No. 2 waste liquid tank and the rainwater well respectively. The outlet of the equipment being cleaned is connected to one end of the manifold and return water manifold, and the other end of the return water manifold is connected to the inlet of the cleaning tank. The manifold is connected to the return water manifold via a recirculation valve, and the manifold is connected to the return water manifold via a monitoring pipe. The return water manifold is connected to the inlet of the cleaning tank via a dosing device.

[0007] Furthermore, the outlet of the demineralized water pipeline is divided into two paths after passing through the demineralized water supply pressure gauge, the demineralized water makeup pressure gauge, and the pump sealing water supply valve. One path goes through the demineralized water to the dosing device supply valve and is connected to the dosing device, while the other path goes through the demineralized water supply main valve and is connected to the inlet of the cleaning tank.

[0008] Furthermore, the outlet of the cleaning tank is connected to the inlet of the first branch and the inlet of the second branch via the inlet valve and inlet filter of the cleaning pump. The outlet of the first branch and the outlet of the second branch are connected to the inlet of the main pipe after being connected by a pipe. The first branch is equipped with the inlet valve of the second cleaning pump, the second cleaning pump, the outlet pressure gauge of the second cleaning pump, the outlet valve of the second cleaning pump, and the outlet check valve of the second cleaning pump in sequence along the water flow direction. The second branch is equipped with the inlet pressure gauge of the cleaning pump, the inlet valve of the first cleaning pump, the first cleaning pump, the outlet pressure gauge of the first cleaning pump, the outlet valve of the first cleaning pump, and the outlet check valve of the first cleaning pump in sequence along the water flow direction.

[0009] Furthermore, the outlet of the manifold is connected to the inlet of the outlet filter via the heater inlet valve, the heater shell side, and the heater outlet valve. The outlet of the manifold is divided into two paths after passing through the heater bypass valve. One path is connected to the inlet of the outlet filter, and the other path is connected to the manifold. The outlet of the outlet filter is connected to the equipment being cleaned via a first cleaning valve and a second cleaning valve, wherein the first cleaning valve and the second cleaning valve are connected in parallel.

[0010] Furthermore, the drain outlet of the equipment being cleaned is connected to the outlet of the auxiliary steam pipeline via the first drain pipe main valve and the drain pipeline. After the pipeline is connected, it is divided into two paths. One path is connected to the pipe-side inlet of the heater via the second steam pressure gauge, the auxiliary steam regulating valve and the first steam pressure gauge. The other path is connected to the inlet of the pipeline pump via the second drain pipe main valve.

[0011] Furthermore, the heater's pipe-side outlet is connected to the rainwater well via a first steam condensate drain valve and a second steam condensate drain valve; the outlet of the auxiliary steam pipeline is equipped with an auxiliary steam supply pressure gauge and an auxiliary steam supply valve.

[0012] Furthermore, the drain outlet of the cleaning tank is connected to the inlet of the pipeline pump via the cleaning tank drain valve and the main drain valve. The pipeline pump is connected in parallel with a pipeline pump bypass valve. A pipeline pump inlet valve is provided at the inlet of the pipeline pump, and a pipeline pump outlet valve is provided at the outlet of the pipeline pump.

[0013] Furthermore, the outlet of the pipeline pump is connected to the No. 1 waste liquid tank via the inlet valve of the No. 1 waste liquid tank, the outlet of the pipeline pump is connected to the No. 2 waste liquid tank via the inlet valve of the No. 2 waste liquid tank, and the outlet of the pipeline pump is connected to the rainwater well via the drain valve to the rainwater well.

[0014] Furthermore, the outlet of the equipment being cleaned is divided into two paths after passing through the first return water valve and the second return water valve. One path is connected to the main manifold via the return water pipe drain valve, and the other path is connected to one end of the return water main manifold via the return water main manifold pressure gauge and the first return water main valve. The other end of the return water main manifold is connected to the inlet of the cleaning tank via the second return water main valve.

[0015] Furthermore, the dosing device is equipped with a dosing device inlet valve, a flushing valve, a dosing funnel, a suction valve, an injection valve, an ejector, and a dosing device outlet valve. The return water main pipe is divided into two paths after passing through the inlet valve of the dosing device. One path is connected to the inlet of the ejector via the flushing valve, dosing funnel, suction valve and injection valve. The other path is connected to the inlet of the ejector. The outlet of the ejector is connected to the inlet of the cleaning tank via the outlet valve of the dosing device.

[0016] The present invention has the following beneficial effects: The chemical cleaning device described in this invention, in specific operation, takes into account multiple functions such as system water replenishment, circulation, heating, filtration, monitoring, chemical dosing, flow distribution, blind zone flushing, condensate discharge, and waste liquid classification treatment, thereby reducing the construction time and cost of chemical cleaning, improving the chemical cleaning effect, and meeting the requirements of chemical cleaning for nuclear power units.

[0017] Furthermore, this invention employs a modular design, connecting the system using different functional paths. It includes a multi-functional, multi-modal device for system water replenishment and pressure monitoring, two circulating pumps providing drive, heater M7 for heating and drainage, two sets of filters for filtration, cleaning process monitoring, chemical dosing, flow distribution, blind zone flushing and corresponding drainage discharge, and waste liquid classification and treatment, which can improve the chemical cleaning effect. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a structural diagram of the present invention.

[0020] Among them, M1 is the cleaning tank, M2 is the dosing device, M3 is the pump inlet filter, M4 is the first cleaning pump, M5 is the second cleaning pump, M6 is the monitoring pipe, M7 is the heater, M8 is the outlet filter, M9 is the equipment being cleaned, M10 is the drain line, M11 is the auxiliary steam line, M12 is the pipeline pump, M13 is the first waste liquid tank, M14 is the second waste liquid tank, M15 is the demineralized water line, M2-1 is the flushing valve, M2-2 is the dosing funnel, M2-3 is the suction valve, M2-4 is the injection valve, M2-5 is the ejector, V1 is the cleaning pump inlet valve, and V2 is the inlet valve of the first cleaning pump. The valves are as follows: V3 is the outlet valve of cleaning pump No. 1; V4 is the outlet check valve of cleaning pump No. 1; V5 is the inlet valve of cleaning pump No. 2; V6 is the outlet valve of cleaning pump No. 2; V7 is the outlet check valve of cleaning pump No. 2; V8 is the recirculation valve; V9 is the heater inlet valve; V10 is the heater outlet valve; V11 is the heater bypass valve; V12 is the first cleaning valve; V13 is the second cleaning valve; V14 is the first return water valve; V15 is the second return water valve; V16 is the first return water main valve; V17 is the second return water main valve; V18 is the inlet valve of the dosing device; V19 is the outlet valve of the dosing device; and V20 is the drain valve of the cleaning tank. V21 is the return water pipe drain valve; V22 is the inlet water pipe drain valve; V23 is the main drain valve; V24 is the second drain pipe main drain valve; V25 is the pipeline pump inlet valve; V26 is the pipeline pump outlet valve; V27 is the pipeline pump bypass valve; V28 is the No. 1 waste liquid tank inlet valve; V29 is the No. 2 waste liquid tank inlet valve; V30 is the drain valve to the rainwater well; V31 is the auxiliary steam supply valve; V32 is the auxiliary steam regulating valve; V33 is the first steam condensate discharge valve; V34 is the second steam condensate discharge valve; V35 is the first drain pipe main drain valve; V36 is the sampling valve; V37 is the demineralized water supply valve. The main valve, V38 is the demineralized water supply valve to the dosing unit, V39 is the pump sealing water supply valve, L1 is the cleaning tank level gauge, L2 is the No. 1 waste liquid tank level gauge, L3 is the No. 2 waste liquid tank level gauge, P1 is the cleaning pump inlet pressure gauge, P2 is the No. 1 cleaning pump outlet pressure gauge, P3 is the No. 2 cleaning pump outlet pressure gauge, P4 is the water supply header pressure gauge, P5 is the recirculation header pressure gauge, P6 is the return water header pressure gauge, P7 is the first steam pressure gauge, P8 is the second steam pressure gauge, P9 is the auxiliary steam supply pressure gauge, P10 is the demineralized water makeup pressure gauge, and P11 is the demineralized water supply pressure gauge. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the description of this invention, it should be understood that the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0023] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0024] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Additionally, the character " / " in this invention generally indicates that the preceding and following objects have an "or" relationship.

[0025] It should be understood that although terms such as first, second, third, etc., may be used in the embodiments of the present invention to describe the preset range, these preset ranges should not be limited to these terms. These terms are only used to distinguish the preset ranges from one another. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0026] Depending on the context, the word "if" as used here can be interpreted as "when," "when," "in response to determination," or "in response to detection." Similarly, depending on the context, the phrase "if determination" or "if detection (of the stated condition or event)" can be interpreted as "when determination," "in response to determination," "when detection (of the stated condition or event)," or "in response to detection (of the stated condition or event)."

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0028] The accompanying drawings illustrate various structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0029] refer to Figure 1The chemical cleaning device of the present invention includes a cleaning tank M1, a dosing device M2, a pump inlet filter M3, a first cleaning pump M4, a second cleaning pump M5, a monitoring pipe M6, a heater M7, an outlet filter M8, the equipment to be cleaned M9, a drain pipe M10, an auxiliary steam pipe M11, a pipeline pump M12, a first waste liquid tank M13, a second waste liquid tank M14, a demineralized water pipe M15, a flushing valve M2-1, a dosing funnel M2-2, a suction valve M2-3, an injection valve M2-4, an ejector M2-5, a cleaning pump inlet valve V1, and a first cleaning pump... Pump inlet valve V2, No. 1 cleaning pump outlet valve V3, No. 1 cleaning pump outlet check valve V4, No. 2 cleaning pump inlet valve V5, No. 2 cleaning pump outlet valve V6, No. 2 cleaning pump outlet check valve V7, recirculation valve V8, heater inlet valve V9, heater outlet valve V10, heater bypass valve V11, first cleaning valve V12, second cleaning valve V13, first return water valve V14, second return water valve V15, first return water main valve V16, second return water main valve V17, dosing device inlet valve V18, dosing device outlet valve V19, cleaning tank drain valve V20, Return Water Pipe Drain Valve; V21, Inlet Water Pipe Drain Valve; V22, Main Drain Valve; V23, Second Drain Pipe Main Drain Valve; V24, Pipeline Pump Inlet Valve; V25, Pipeline Pump Outlet Valve; V26, Pipeline Pump Bypass Valve; V27, Waste Liquid Tank No. 1 Inlet Valve; V28, Waste Liquid Tank No. 2 Inlet Valve; V29, Drain Valve to Rainwater Well; V30, Auxiliary Steam Supply Valve; V31, Auxiliary Steam Regulating Valve; V32, First Steam Condensate Drain Valve; V33, Second Steam Condensate Drain Valve; V34, First Drain Pipe Main Drain Valve; V35, Sampling Valve; V36, Demineralized Water Supply Main Valve. Valve V37, Demineralized water supply valve to dosing unit V38, Pump sealing water supply valve V39, Cleaning tank level gauge L1, Waste liquid tank level gauge L2, Waste liquid tank level gauge L3, Cleaning pump inlet pressure gauge P1, Cleaning pump outlet pressure gauge P2, Cleaning pump outlet pressure gauge P3, Water supply main pipe pressure gauge P4, Recirculation main pipe pressure gauge P5, Return water main pipe pressure gauge P6, First steam pressure gauge P7, Second steam pressure gauge P8, Auxiliary steam supply pressure gauge P9, Demineralized water makeup pressure gauge P10, and Demineralized water supply pressure gauge P11; The outlet of the demineralized water pipeline M15 is divided into two branches after passing through the demineralized water supply pressure gauge P11, the demineralized water makeup pressure gauge P10, and the pump sealing water supply valve V39. One branch connects to the dosing device M2 via the demineralized water supply valve V38, while the other branch connects to the inlet of the cleaning tank M1 via the main demineralized water supply valve V37. The outlet of the cleaning tank M1 is connected to the inlet of the first branch and the inlet of the second branch via the cleaning pump inlet valve V1 and the pump inlet filter M3. The outlets of the first and second branches are connected to the inlet of the main pipe after being connected by a parallel pipeline. Along the water flow direction, the first branch is equipped with the second cleaning pump inlet valve V5, the second cleaning pump M5, the second cleaning pump outlet pressure gauge P3, the second cleaning pump outlet valve V6, and the second cleaning pump outlet valve. Check valve V7 is installed at the outlet. On the second branch, along the water flow direction, pressure gauge P1 for the inlet of the cleaning pump, valve V2 for the inlet of the first cleaning pump, pump M4 for the first cleaning pump, pressure gauge P2 for the outlet of the first cleaning pump, valve V3 for the outlet of the first cleaning pump, and check valve V4 for the outlet of the first cleaning pump are installed in sequence. The outlet of the manifold is connected to the inlet of the outlet filter M8 via heater inlet valve V9, the shell side of heater M7, and heater outlet valve V10. The outlet of the manifold is divided into two paths after passing heater bypass valve V11. One path is connected to the inlet of the outlet filter M8, and the other path is connected to the manifold. The outlet of the outlet filter M8 is connected to the equipment M9 to be cleaned via first cleaning valve V12 and second cleaning valve V13. The first cleaning valve V12 and the second cleaning valve V13 are connected in parallel. The drain outlet of the equipment M9 being cleaned is connected to the outlet of the auxiliary steam pipeline M11 via the first drain pipe main valve V35 and the drain pipe M10. After being connected to the auxiliary steam pipeline M11, the drain outlet is divided into two paths. One path is connected to the pipe-side inlet of the heater M7 via the second steam pressure gauge P8, the auxiliary steam regulating valve V32, and the first steam pressure gauge P7. The other path is connected to the inlet of the pipeline pump M12 via the second drain pipe main valve V24. The pipe-side outlet of the heater M7 is connected to the rainwater well via the first steam condensate drain valve V33 and the second steam condensate drain valve V34. The outlet of the auxiliary steam pipeline M11 is equipped with an auxiliary steam supply pressure gauge P9 and an auxiliary steam supply valve V31.

[0030] The drain outlet of the cleaning tank M1 is connected to the inlet of the pipeline pump M12 via the cleaning tank drain valve V20 and the main drain valve V23. The pipeline pump M12 is connected in parallel with the pipeline pump bypass valve V27. The pipeline pump inlet valve V25 is provided at the inlet of the pipeline pump M12. The pipeline pump outlet valve V26 is provided at the outlet of the pipeline pump M12. The outlet of the pipeline pump M12 is connected to the first waste liquid tank M13 via the first waste liquid tank inlet valve V28. The outlet of the pipeline pump M12 is connected to the second waste liquid tank M14 via the second waste liquid tank inlet valve V29. The outlet of the pipeline pump M12 is connected to the rainwater well via the rainwater well drain valve V30.

[0031] The outlet of the equipment M9 being cleaned is divided into two paths after passing through the first return water valve V14 and the second return water valve V15. One path is connected to the main manifold via the return water drain valve V21, and the other path is connected to one end of the return water main manifold via the return water main manifold pressure gauge P6 and the first return water main valve V16. The other end of the return water main manifold is connected to the inlet of the cleaning tank M1 via the second return water main valve V17. The main manifold is connected to the return water main manifold via the recirculation valve V8 and the monitoring pipe M6. The return water main manifold is divided into two paths after passing through the inlet valve V18 of the dosing device. One path is connected to the inlet of the ejector M2-5 via the flushing valve M2-1, the dosing funnel M2-2, the suction valve M2-3, and the injection valve M2-4, and the other path is connected to the inlet of the ejector M2-5. The outlet of the ejector M2-5 is connected to the inlet of the cleaning tank M1 via the outlet valve V19 of the dosing device.

[0032] In this embodiment, a cleaning tank level gauge L1 is installed on the cleaning tank M1; a waste liquid tank level gauge L2 is installed on the first waste liquid tank M13; and a waste liquid tank level gauge L3 is installed on the second waste liquid tank M14.

[0033] In this embodiment, the pore size of the pump inlet filter M3 is no more than 3 mm, and the pore size of the outlet filter M8 is no more than 1 mm.

[0034] In this embodiment, heater M7 is a surface heater, with water supplied through the pipe side and heating steam supplied through the shell side. Heating steam enters from the top, and condensate is discharged from the bottom.

[0035] In this embodiment, waste liquid tank M13 (number one) is used to store waste liquid with a high concentration, typically chemical cleaning solution or passivation waste liquid. Waste liquid tank M14 (number two) is used to store waste liquid with a low concentration, typically rinsing or water flushing waste liquid. Waste liquid tanks M13 and M14 can be of the same size, or they can be installed with different sizes as needed.

[0036] The working process of the chemical cleaning device described in this invention is as follows: 1) System water filling and flushing; 11) Open the demineralized water supply main valve V37. The demineralized water output from the demineralized water pipeline M15 will replenish the demineralized water to the cleaning tank M1 through the demineralized water path. The flow rate and pressure of the demineralized water will be regulated by the demineralized water supply main valve V37. 12) Pipes below the M1 elevation of the cleaning tank are filled with water by gravity, while pipes above the M1 elevation of the cleaning tank are filled with water using either the No. 1 cleaning pump M4 or the No. 2 cleaning pump M5 until the system is full. 13) The system flushing can be either closed-loop flushing or start flushing; 14) The closed-loop flushing path is: cleaning tank M1 → cleaning pump inlet valve V1 → pump inlet filter M3 → No. 1 cleaning pump M4 (or No. 2 cleaning pump M5) → heater M7 → outlet filter M8 → equipment to be cleaned M9 → first return water main valve V16 → second return water main valve V17, a small portion passes through recirculation valve V8 and monitoring pipe M6, and finally returns to cleaning tank M1; 15) The path of open flushing is: cleaning tank M1 → cleaning pump inlet valve V1 → pump inlet filter M3 → No. 1 cleaning pump M4 (or No. 2 cleaning pump M5) → heater M7 → outlet filter M8 → equipment to be cleaned M9 → return water pipe drain valve V21 → main drain valve V23 → to rainwater well drain valve V30. 16) Since the water flushing stage mainly washes away dust and other impurities, the flushing water is eventually discharged into the rainwater well; 17) During the water flushing stage, the following drain valves shall remain closed: dosing device inlet valve V18, dosing device outlet valve V19, cleaning tank drain valve V20, water inlet drain valve V22, second drain pipe main drain valve V24, auxiliary steam supply valve V31, auxiliary steam regulating valve V32, first steam condensate drain valve V33, second steam condensate drain valve V34, and first drain pipe main drain valve V35; 18) Repeat step 14) or step 15) above until the rinsing meets the requirements.

[0037] 2) System temperature rise; 21) The system is filled with qualified demineralized water, and the water level in the cleaning tank M1 is kept at a suitable level; 22) Close the demineralized water supply main valve V37. Demineralized water pipeline M15 determines whether to open the demineralized water supply main valve V37 to replenish water according to the water level requirement of cleaning tank M1. 23) Driven by the first cleaning pump M4 (or the second cleaning pump M5), the following cycle is performed: cleaning tank M1 → cleaning pump inlet valve V1 → pump inlet filter M3 → first cleaning pump M4 (or the second cleaning pump M5) → heater M7 → outlet filter M8 → equipment being cleaned M9 → first return water main valve V16 → second return water main valve V17. Part of the water passes through the recirculation valve V8 and the monitoring pipe M6 and finally returns to the cleaning tank M1. 24) Install monitoring tube M6; 25) Adjust the total flow rate of the system by adjusting the opening of the recirculation valve V8; adjust the flow rate of each branch by adjusting the first return valve V14 and the second return valve V15 to ensure the flow rate balance of each branch. 26) Auxiliary steam is supplied to the shell side of heater M7 through auxiliary steam supply valve V31 and auxiliary steam regulating valve V32 to raise the temperature of the reactor system. Auxiliary steam supply valve V31 is used for the first steam pressure reduction, and auxiliary steam regulating valve V32 is used for the second steam pressure reduction and flow regulation. The heating rate is less than or equal to 28℃ / h. The second steam condensate drain valve V34 is opened, and the opening of the first steam condensate drain valve V33 is adjusted to ensure smooth steam condensate discharge. 27) After the system water temperature rises to the target range, in order to avoid water hammer caused by steam condensate drainage, close the auxiliary steam regulating valve V32 and adjust the opening of the heater bypass valve V11 to ensure that the system water temperature is kept within the target range.

[0038] 3) Dosing of chemicals and chemical cleaning; 31) The system water temperature remains stable, and the water level in the cleaning tank M1 is kept at a suitable level; 32) Open the inlet valve V18 and outlet valve V19 of the dosing device; 33) Open the flushing valve M2-1 and the injection valve M2-4, and add the solid agent to the dosing funnel M2-2. If the water volume of the flushing valve M2-1 is insufficient, the water volume can be increased by opening the demineralized water supply valve V38 to the dosing device to promote the dissolution rate of the solid agent. 34) When adding liquid, close the flushing valve M2-1. The liquid is connected to the suction valve M2-3 via a hose. The agent enters the cleaning tank M1 through the ejector M2-5 for mixing. 35) Add the reagents in the order required by the formula. After adding the reagents, close the inlet valve V18 and the outlet valve V19 of the dosing device. 36) Clean the reactor system as required, and periodically take samples for analysis through sampling valve V36 until cleaning is complete; 37) After cleaning is completed, close the auxiliary steam supply valve V31 and the auxiliary steam regulating valve V32, and stop the system heating; 38) Open the following valves: cleaning tank drain valve V20, return water pipe drain valve V21, inlet water pipe drain valve V22, main drain valve V23, pipeline pump inlet valve V25, pipeline pump outlet valve V26, pipeline pump bypass valve V27 and No. 1 waste liquid tank inlet valve V28, start pipeline pump M12, and discharge chemical cleaning waste liquid to No. 1 waste liquid tank M13.

[0039] 4) Rinsing and passivation; 41) The demineralized water pipeline M15 is used to refill the system with demineralized water for rinsing, and the rinsing water is discharged to the No. 1 waste liquid tank M13. 42) According to steps 31) to 36), a passivating agent is added to passivate the system, and the passivation waste liquid is discharged into waste liquid tank M13.

[0040] 5) Rinse with water after passivation; 51) The demineralized water pipeline M15 is used to fill the system with demineralized water for open flushing. The path is as follows: cleaning tank M1 → cleaning pump inlet valve V1 → pump inlet filter M3 → No. 1 cleaning pump M4 (or No. 2 cleaning pump M5) → heater M7 → outlet filter M8 → equipment to be cleaned M9 → return water pipe drain valve V21 → main drain valve V23 → pipeline pump M12 → No. 2 waste liquid tank M14. 52) Periodically take samples for analysis through sampling valve V36 until the water flushing is qualified; 53) After completion, close the auxiliary steam supply valve V31 and the auxiliary steam regulating valve V32 to stop system heating; 54) Remove the sample from the monitoring tube M6; 55) The system switches to closed-loop circulation: The path is: cleaning tank M1 → cleaning pump inlet valve V1 → pump inlet filter M3 → No. 1 cleaning pump M4 (or No. 2 cleaning pump M5) → heater M7 → outlet filter M8 → equipment to be cleaned M9 → first return water main valve V16 → second return water main valve V17, a small part passes through recirculation valve V8, and finally returns to cleaning tank M1.

[0041] 6) Blind spot flushing and system evacuation; 61) Close the auxiliary steam supply valve V31 and the auxiliary steam regulating valve V32, open the second drain pipe main valve V24 and the first drain pipe main valve V35 to establish a drainage path for the water supply pipeline. 62) Open all the drain valves in the M9 equipment to be cleaned one by one, and close them after visually clearing them for 30-60 seconds. The rinsing water is discharged to the No. 2 waste liquid tank M14 through the drain pipe M10 and after borrowing part of the steam pipe. 63) After all the drain valves in the cleaning equipment M9 have been rinsed, open the following valves: cleaning tank drain valve V20, return water pipe drain valve V21, inlet water pipe drain valve V22, main drain valve V23, pipeline pump inlet valve V25, pipeline pump outlet valve V26, pipeline pump bypass valve V27 and No. 1 waste liquid tank inlet valve V28, start pipeline pump M12, and discharge the chemical cleaning waste liquid to No. 2 waste liquid tank M14; 64) Shut down cleaning pump M4 (or cleaning pump M5). 65) Open all the drain valves in the M9 of the equipment being cleaned to drain the residual water from the system; 66) Waste liquid tank M13 contains high-concentration waste liquid, while waste liquid tank M14 contains low-concentration waste liquid. They can be classified and treated according to requirements.

[0042] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and disclosure of the invention. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0043] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

[0044] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A chemical cleaning apparatus, characterized in that, Includes demineralized water pipeline (M15), dosing device (M2), cleaning tank (M1), manifold, outlet filter (M8), equipment to be cleaned (M9), auxiliary steam pipeline (M11), heater (M7), pipeline pump (M12), waste liquid tank No. 1 (M13), waste liquid tank No. 2 (M14), rainwater well and return water main; The outlet of the demineralized water pipeline (M15) is connected to the inlet of the dosing device (M2) and the inlet of the cleaning tank (M1). The outlet of the cleaning tank (M1) is connected to the inlet of the manifold. The outlet of the manifold is connected to the inlet of the outlet filter (M8). The outlet of the outlet filter (M8) is connected to the equipment being cleaned (M9). The drain outlet of the equipment being cleaned (M9) and the outlet of the auxiliary steam pipe (M11) are connected to the pipe-side inlet of the heater (M7) and the inlet of the pipeline pump (M12) through a parallel pipe. The drain outlet of the cleaning tank (M1) is connected to the inlet of the pipeline pump (M12), and the outlet of the pipeline pump (M12) is connected to the No. 1 waste liquid tank (M13), the No. 2 waste liquid tank (M14), and the rainwater well, respectively. The outlet of the equipment being cleaned (M9) is connected to one end of the manifold and return water manifold, and the other end of the return water manifold is connected to the inlet of the cleaning tank (M1). The manifold is connected to the return water manifold via the recirculation valve (V8), and the manifold is connected to the return water manifold via the monitoring pipe (M6). The return water manifold is connected to the inlet of the cleaning tank (M1) via the dosing device (M2).

2. The chemical cleaning apparatus according to claim 1, characterized in that, The outlet of the demineralized water pipeline (M15) is divided into two paths after passing through the demineralized water supply pressure gauge (P11), the demineralized water makeup pressure gauge (P10), and the pump sealing water supply valve (V39). One path is connected to the dosing device (M2) via the demineralized water supply valve (V38), and the other path is connected to the inlet of the cleaning tank (M1) via the demineralized water supply main valve (V37).

3. The chemical cleaning apparatus according to claim 1, characterized in that, The outlet of the cleaning tank (M1) is connected to the inlet of the first branch and the inlet of the second branch via the cleaning pump inlet valve (V1) and the pump inlet filter (M3). The outlet of the first branch and the outlet of the second branch are connected to the inlet of the main pipe after being connected by a pipe. The first branch is equipped with the second cleaning pump inlet valve (V5), the second cleaning pump (M5), the second cleaning pump outlet pressure gauge (P3), the second cleaning pump outlet valve (V6), and the second cleaning pump outlet check valve (V7) in sequence along the water flow direction. The second branch is equipped with the cleaning pump inlet pressure gauge (P1), the first cleaning pump inlet valve (V2), the first cleaning pump (M4), the first cleaning pump outlet pressure gauge (P2), the first cleaning pump outlet valve (V3), and the first cleaning pump outlet check valve (V4) in sequence along the water flow direction.

4. The chemical cleaning apparatus according to claim 1, characterized in that, The outlet of the manifold is connected to the inlet of the outlet filter (M8) via the heater inlet valve (V9), the shell side of the heater (M7), and the heater outlet valve (V10). The outlet of the manifold is divided into two paths after passing through the heater bypass valve (V11). One path is connected to the inlet of the outlet filter (M8), and the other path is connected to the manifold. The outlet of the outlet filter (M8) is connected to the equipment being cleaned (M9) via the first cleaning valve (V12) and the second cleaning valve (V13), wherein the first cleaning valve (V12) and the second cleaning valve (V13) are connected in parallel.

5. The chemical cleaning apparatus according to claim 1, characterized in that, The drain outlet of the equipment being cleaned (M9) is connected to the outlet of the auxiliary steam pipeline (M11) via the first drain pipe main valve (V35) and the drain pipeline (M10). After the pipeline is connected, it is divided into two paths. One path is connected to the pipe-side inlet of the heater (M7) via the second steam pressure gauge (P8), the auxiliary steam regulating valve (V32) and the first steam pressure gauge (P7). The other path is connected to the inlet of the pipeline pump (M12) via the second drain pipe main valve (V24).

6. The chemical cleaning apparatus according to claim 1, characterized in that, The outlet of the heater (M7) is connected to the rainwater well via the first steam condensate drain valve (V33) and the second steam condensate drain valve (V34); the outlet of the auxiliary steam pipeline (M11) is equipped with an auxiliary steam supply pressure gauge (P9) and an auxiliary steam supply valve (V31).

7. The chemical cleaning apparatus according to claim 1, characterized in that, The drain outlet of the cleaning tank (M1) is connected to the inlet of the pipeline pump (M12) via the cleaning tank drain valve (V20) and the main drain valve (V23). The pipeline pump (M12) is connected in parallel with a pipeline pump bypass valve (V27). A pipeline pump inlet valve (V25) is provided at the inlet of the pipeline pump (M12), and a pipeline pump outlet valve (V26) is provided at the outlet of the pipeline pump (M12).

8. The chemical cleaning apparatus according to claim 1, characterized in that, The outlet of the pipeline pump (M12) is connected to the first waste liquid tank (M13) via the inlet valve (V28) of the first waste liquid tank. The outlet of the pipeline pump (M12) is connected to the second waste liquid tank (M14) via the inlet valve (V29) of the second waste liquid tank. The outlet of the pipeline pump (M12) is connected to the rainwater well via the drain valve (V30).

9. The chemical cleaning apparatus according to claim 1, characterized in that, The outlet of the equipment being cleaned (M9) is divided into two paths after passing through the first return water valve (V14) and the second return water valve (V15). One path is connected to the main manifold via the return water drain valve (V21), and the other path is connected to one end of the return water main manifold via the return water main manifold pressure gauge (P6) and the first return water main valve (V16). The other end of the return water main manifold is connected to the inlet of the cleaning tank (M1) via the second return water main valve (V17).

10. The chemical cleaning apparatus according to claim 1, characterized in that, The dosing device (M2) is equipped with a dosing device inlet valve (V18), a flushing valve (M2-1), a dosing funnel (M2-2), a suction valve (M2-3), an injection valve (M2-4), an ejector (M2-5), and a dosing device outlet valve (V19). The return water main pipe is divided into two paths after passing through the inlet valve (V18) of the dosing device. One path is connected to the inlet of the ejector (M2-5) via the flushing valve (M2-1), dosing funnel (M2-2), suction valve (M2-3), and injection valve (M2-4). The other path is connected to the inlet of the ejector (M2-5). The outlet of the ejector (M2-5) is connected to the inlet of the cleaning tank (M1) via the outlet valve (V19) of the dosing device.

Images