Device and method for cleaning deposited impurities of lead cooling system

Abstract

The invention belongs to the technical field of liquid lead-based cooling test systems, and particularly relates to a cleaning device and method for deposited impurities of a lead cooling system. An inlet of a sludge circulating cleaning pump is connected with a filter, and the other end of the filter is connected with a bottom pipeline of a lead cooling system; the outlet of the sludge circulating cleaning pump is connected with the inlet of the heater; the outlet of the heater is connected with the inlet of the pressure-stabilizing container; an outlet of the pressure stabilizing container is connected with a top pipeline of the lead cooling system to form a cleaning circulation loop; the upper end of the pressure stabilizing container is connected with the top liquid filling tank through a liquid inlet pipeline, the top liquid filling tank is connected with the waste gas treatment unit through an exhaust pipe, the bottom liquid discharging pipe is connected with the waste liquid storage pool, and the negative pressure sucking pump is connected with the waste gas treatment unit. The cleaning device can safely and efficiently remove stubborn deposited impurities on the inner wall and the dead zone of the lead cooling system, corrosion to structural steel in the cleaning process is reduced to the maximum extent, waste liquid and waste gas generated in the cleaning process are effectively collected and treated, and secondary pollution is prevented.

Description

Technical Field

[0001] This invention belongs to the technical field of liquid lead-based cooling test systems, specifically relating to a device and method for cleaning deposited impurities in a lead cooling system. Background Technology

[0002] During long-term operation, various impurities (including lead oxides, iron oxides, etc.) will gradually accumulate on the surface of the internal steel, the wall of the local dead zone, and the tube wall of the heat exchanger in the lead-cooled test system. Moreover, the deposited impurities are often mixed with lead-based coolant. When the test system changes from a hot state to a cold state, the impurities mixed with lead-based coolant will solidify on the surface of the structural steel to form a composite deposit that is difficult to remove by simple mechanical means or heating and melting.

[0003] Currently, cleaning and maintenance of such testing systems typically employ methods such as mechanical vibration abrasion, high-pressure water jet flushing, or chemical immersion cleaning. However, conventional mechanical methods like high-pressure water jet flushing are insufficient to completely remove strongly adhering deposits from lead-cooled testing equipment and pipelines, and also generate large amounts of lead-containing wastewater. While traditional chemical immersion cleaning (such as nitric acid and aqua regia immersion) has strong dissolving power, it is highly corrosive to the steel substrate and has poor dissolving effect on complex deposits. Furthermore, it generates large amounts of toxic waste gas and difficult-to-treat lead-containing waste acid, causing severe environmental pollution and posing high safety risks to workers. Therefore, there is an urgent need to develop a dedicated cleaning device and method that is highly efficient, low-corrosion, safe, and environmentally friendly. Summary of the Invention

[0004] The technical problem solved by this invention is to provide a device and method for cleaning deposited impurities in a lead-cooling system, which can safely and efficiently remove stubborn deposited impurities from the inner wall and dead zones of the lead-cooling system, minimize the corrosion of structural steel during the cleaning process, and effectively collect and treat waste liquid and waste gas generated during the cleaning process to prevent secondary pollution.

[0005] The technical solution adopted in this invention is as follows:

[0006] A cleaning device for deposited impurities in a lead-cooled system includes a sludge circulation cleaning pump, a heater, a pressure stabilizing container, a filter, a top filling tank, a waste liquid storage tank, a waste gas treatment unit, a negative pressure suction pump, and the lead-cooled system. The inlet of the sludge circulation cleaning pump is connected to the filter via a pump inlet pipe, and the other end of the filter is connected to the bottom pipe of the lead-cooled system. The outlet of the sludge circulation cleaning pump is connected to the inlet of the heater via a pump outlet pipe, and the outlet of the heater is connected to the inlet of the pressure stabilizing container. The outlet of the pressure stabilizing container is connected to the top pipe of the lead-cooled system, forming a cleaning circulation loop. The upper end of the pressure stabilizing container is connected to the top filling tank via a liquid inlet pipe, and the top filling tank is connected to the waste gas treatment unit via an exhaust pipe. The bottom of the filter is connected to the pump inlet pipe and the pump outlet pipe via a bottom drain pipe, and the bottom drain pipe is connected to the waste liquid storage tank. The negative pressure suction pump is connected to the waste gas treatment unit.

[0007] The internal flow channel surface of the sludge circulation cleaning pump contains a ceramic lining or a polytetrafluoroethylene coating.

[0008] The top filling tank and the material mixing tank are connected by a pipeline, and a delivery pump is installed on the pipeline. The top filling tank and the material mixing tank are respectively connected to the waste gas treatment unit through exhaust pipes. An exhaust valve is installed on the exhaust pipe 22. The upper end of the pressure stabilizing container is connected to the waste gas treatment unit through a pipeline.

[0009] The waste liquid storage tank includes a drainage tank and a waste liquid treatment tank, which are connected by pipelines. The waste liquid treatment tank is also connected to the waste gas treatment unit by pipelines.

[0010] The heater preheats the cleaning fluid to 20-70°C before injecting it into the lead-cooling system.

[0011] The waste gas treatment unit includes a condenser, an activated carbon adsorber, and an exhaust valve for treating waste gas; the condenser is connected to the waste gas generated by the top liquid filling tank, the material mixing tank, the waste liquid treatment pool, and the pressure stabilizing container, and the waste liquid generated by condensing the waste gas is introduced into the waste liquid storage pool.

[0012] The cooling medium of the condenser is cooling water.

[0013] The gas exiting the condenser is fed into the activated carbon adsorber for further purification and adsorption of the waste gas.

[0014] The negative pressure air pump is connected to the activated carbon adsorber.

[0015] A method for cleaning deposited impurities in a lead cooling system includes the following steps:

[0016] Step 1: Prepare the cleaning solution by mixing the following solutions in the material mixing tank by volume percentage: 10-40% acetic acid, 1-15% hydrogen peroxide, 0.5-30% ethanol, and make up the remainder with deionized water.

[0017] Step 2: Filling with liquid. Before filling with liquid, use a transfer pump to transfer the cleaning liquid from the material mixing tank to the top filling tank, and then inject the cleaning liquid into the pressure stabilizing container and the top pipeline of the lead cooling system, while simultaneously venting air through the exhaust valve.

[0018] Step 3: Start the sludge circulation cleaning pump to circulate the cleaning liquid in the system, turn on the heater to gradually heat the cleaning liquid to 20-70℃, and circulate for 2-12 hours; during this process, the waste gas generated is continuously treated by the waste gas treatment unit, and the pressure stabilizing container and waste liquid collection tank are kept under slight negative pressure by the negative pressure suction device.

[0019] Step 4: Stop the circulation, let it settle, and then discharge the waste liquid into the waste liquid storage tank through the bottom drain pipe for neutralization and sedimentation treatment;

[0020] Step 5: Rinse the lead-cooled system pipes and equipment with clean water until the pH value of the rinsing water is neutral, and collect the rinsing water into the waste liquid storage tank for neutralization and sedimentation treatment. After cleaning, the waste liquid is stored in tanks and centrally treated by a qualified hazardous waste treatment unit.

[0021] The beneficial effects of this invention are:

[0022] (1) The present invention provides a lead cooling system deposition impurity cleaning device and method with high cleaning efficiency and low corrosivity: the “acetic acid-hydrogen peroxide-ethanol” cleaning solution system has good oxidation, complexation and dissolution ability for lead and lead bismuth deposition impurities, and has high cleaning efficiency; it is much milder than strong inorganic acids (such as nitric acid) and has a stronger ability to treat lead and lead bismuth, which can effectively protect the metal materials of the equipment body and extend the service life of the equipment.

[0023] (1) The present invention provides a lead-cooled system deposition impurity cleaning device and method, which is safe to operate: the fully enclosed waste gas treatment system composed of "top and dead zone exhaust pipe + activated carbon adsorption layer + negative pressure suction device" can promptly export and treat oxygen and acid mist generated by the cleaning reaction. The combination of the leak-proof waste liquid storage tank and the neutralization sedimentation device ensures that hazardous waste liquid is safely collected and pretreated, preventing soil and groundwater pollution. Attached Figure Description

[0024] To more clearly illustrate the embodiments of the present invention, the accompanying drawings used in describing the embodiments of the present invention will be briefly described below. Obviously, the drawings described below are merely some embodiments recorded in the present invention. Those skilled in the art can derive other drawings from the following drawings without any creative effort.

[0025] Figure 1 This is a schematic diagram of a cleaning device for deposited impurities in a lead cooling system provided by the present invention.

[0026] In the diagram: 1-Circulating cleaning pump; 11-Pump inlet pipe; 12-Pump outlet pipe; 13-Regulating valve; 2-Top filling tank; 21-Inlet pipe; 22-Exhaust pipe; 23-Material mixing tank; 24-Transfer pump; 31-Bottom drain pipe; 32-Drain valve; 4-Waste liquid storage tank; 41-Drainage tank; 42-Waste liquid treatment tank; 50-Pressure stabilizing container; 51-Heater; 52-Cooler; 6-Waste gas treatment unit; 61-Condenser; 62-Activated carbon adsorber; 63-Cooling water; 64-Exhaust valve; 7-Negative pressure suction pump; 100-Lead cooling system. Detailed Implementation

[0027] 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 embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0028] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., refer to the orientation or positional relationship shown in the accompanying drawings, and are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or a connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0030] like Figure 1 As shown, the present invention provides a cleaning device for deposited impurities in a lead-cooling system, comprising a sludge circulation cleaning pump (1), a heater (51), a pressure stabilizing container (50), a filter (52), a top filling tank (2), a waste liquid storage tank (4), a waste gas treatment unit (6), a negative pressure suction pump (7), and a lead-cooling system (100).

[0031] The inlet of the sludge circulation cleaning pump (1) is connected to the filter (52) through the pump inlet pipe (11), and the other end of the filter (52) is connected to the bottom pipe of the lead cooling system (100); the outlet of the sludge circulation cleaning pump (1) is connected to the inlet of the heater (51) through the pump outlet pipe 12, and the pump outlet pipe 12 is equipped with a regulating valve 13; the outlet of the heater (51) is connected to the inlet of the pressure stabilizing container (50); the outlet of the pressure stabilizing container (50) is connected to the top pipe of the lead cooling system (100); the above constitutes a cleaning circulation loop;

[0032] Furthermore, the internal flow channel structure of the sludge circulation cleaning pump (01) is made of materials such as 316L, 31608, and T91 stainless steel, and the surface contains a ceramic lining or a polytetrafluoroethylene coating.

[0033] Furthermore, the sludge circulation cleaning pump (01) establishes forced circulation during the cleaning process, so that the prepared cleaning liquid flows continuously in the system, impacts and dissolves the deposits, and collects them in the filter (52) to prevent the stripped particles from settling again.

[0034] The upper end of the pressure stabilizing container (50) is connected to the top filling tank (2) through the liquid inlet pipe (21). The top filling tank (2) is connected to the material mixing tank (23) through a pipeline. A delivery pump (24) is provided on the pipeline. The top filling tank (2) and the material mixing tank (23) are respectively connected to the waste gas treatment unit (6) through the exhaust pipe 22. An exhaust valve (64) is provided on the exhaust pipe 22. The upper end of the pressure stabilizing container (50) is connected to the waste gas treatment unit (6) through a pipeline.

[0035] The bottom of the filter (52) is connected to the pump inlet pipe (11) and the pump outlet pipe (12) respectively through the bottom drain pipe (31). The bottom drain pipe (31) is connected to the waste liquid storage tank (4). The bottom drain pipe (31) is equipped with a drain valve (32). The waste liquid storage tank (4) includes a drain tank (41) and a waste liquid treatment tank (42). The drain tank (41) and the waste liquid treatment tank (42) are connected by a pipeline. The waste liquid treatment tank (42) is connected to the waste gas treatment unit (6) by a pipeline. An exhaust valve (64) is provided on the connecting pipeline. After cleaning, the waste liquid rich in impurities is introduced into the waste liquid storage tank (4) through the drain pipe (31) and the drain valve (32).

[0036] The heater (51) preheats the cleaning fluid to 20-70°C before injecting it into the lead cooling system (100);

[0037] The pressure stabilizing container (50) is used to add cleaning fluid and to regulate the pressure of the circulating cleaning circuit by adjusting the pressure of the air space.

[0038] The waste gas treatment unit (6) includes a condenser (61), an activated carbon adsorber (62), and an exhaust valve (64) for treating waste gas.

[0039] The condenser (61) is connected to the waste gas generated by the top filling tank (2), material mixing tank (23), waste liquid treatment pool (42) and pressure stabilizing container (50). The waste liquid generated by condensing the waste gas is introduced into the waste liquid storage pool through the drain pipe (31) and drain valve (32). The cooling medium of the condenser (61) is cooling water (63).

[0040] The gas outlet of the condenser (61) is fed into the activated carbon adsorber (62) for further purification and adsorption of the waste gas;

[0041] The negative pressure air pump (7) is connected to the activated carbon adsorber (62) to maintain the cleaning liquid circulation loop and the waste gas treatment unit (6) in a slightly negative pressure state (0.08-0.09MPa) to prevent the leakage of harmful gases.

[0042] The present invention provides a method for cleaning deposited impurities in a lead cooling system, comprising the following steps:

[0043] Step 1: Prepare the cleaning solution by mixing the following solutions in the material mixing tank (23) by volume percentage: 10-40% acetic acid, 1-15% hydrogen peroxide, 0.5-30% ethanol, and make up the remainder with deionized water.

[0044] Step 2: Filling with liquid. Before filling with liquid, use a transfer pump (24) to transfer the cleaning liquid from the material mixing tank (23) to the top filling tank (2), and then inject the cleaning liquid into the top pipe of the pressure stabilizing container (50) and the lead cooling system (100), while simultaneously venting air through the exhaust valve (64).

[0045] Step 3: Start the sludge circulation cleaning pump (1) to circulate the cleaning liquid in the system, turn on the heater (51) to gradually heat the cleaning liquid to 20-70℃, and circulate for 2-12 hours; during this process, the waste gas generated is continuously treated by the waste gas treatment unit (6), and the pressure stabilizing container (50) and waste liquid storage tank (4) are kept under slight negative pressure by the negative pressure suction device (7);

[0046] Step 4: Stop the circulation, let it settle, and then discharge the waste liquid into the waste liquid storage tank (4) through the bottom drain pipe (3) for neutralization and sedimentation treatment;

[0047] Step 5: Rinse the lead-cooled system pipes and equipment with clean water until the pH value of the rinsing water is neutral, and collect the rinsing water into the waste liquid storage tank (4) for neutralization and sedimentation treatment. The waste liquid after cleaning is stored in tanks and centrally treated by a qualified hazardous waste treatment unit.

[0048] While those skilled in the art will recognize that the present invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention, the embodiments should be considered illustrative and non-limiting in all respects. The scope of the invention is defined by the appended claims rather than the foregoing description, and therefore all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0049] Furthermore, it should be understood that although the present invention is described according to embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A cleaning device for deposited impurities in a lead cooling system, characterized in that, The system includes a sludge circulation cleaning pump (1), a heater (51), a pressure stabilizing container (50), a filter (52), a top filling tank (2), a waste liquid storage tank (4), a waste gas treatment unit (6), a negative pressure suction pump (7), and a lead cooling system (100). The inlet of the sludge circulation cleaning pump (1) is connected to the filter (52) through a pump inlet pipe (11), and the other end of the filter (52) is connected to the bottom pipe of the lead cooling system (100). The outlet of the sludge circulation cleaning pump (1) is connected to the inlet of the heater (51) through a pump outlet pipe (12), and the outlet of the heater (51) is connected to the pressure stabilizing container (50). The inlet of the container (50) is connected; the outlet of the pressure stabilizing container (50) is connected to the top pipe of the lead cooling system (100) to form a cleaning circulation loop; the upper end of the pressure stabilizing container (50) is connected to the top filling tank (2) through the liquid inlet pipe (21), the top filling tank (2) is connected to the waste gas treatment unit (6) through the exhaust pipe (22), the bottom of the filter (52) is connected to the pump inlet pipe (11) and the pump outlet pipe (12) through the bottom drain pipe (31), the bottom drain pipe (31) is connected to the waste liquid storage tank (4), and the negative pressure suction pump (7) is connected to the waste gas treatment unit (6).

2. The cleaning apparatus for deposited impurities in a lead cooling system according to claim 1, characterized in that, The internal flow channel surface of the sludge circulation cleaning pump (01) contains a ceramic lining or a polytetrafluoroethylene coating.

3. The cleaning apparatus for deposited impurities in a lead cooling system according to claim 2, characterized in that, The top filling tank (2) and the material mixing tank (23) are connected by a pipeline, and a delivery pump (24) is provided on the pipeline. The top filling tank (2) and the material mixing tank (23) are respectively connected to the waste gas treatment unit (6) through an exhaust pipe (22). An exhaust valve (64) is provided on the exhaust pipe 22. The upper end of the pressure stabilizing container (50) is connected to the waste gas treatment unit (6) through a pipeline.

4. The cleaning apparatus for deposited impurities in a lead cooling system according to claim 3, characterized in that, The waste liquid storage tank (4) includes a drainage tank (41) and a waste liquid treatment tank (42), which are connected by pipelines. The waste liquid treatment tank (42) is connected to the waste gas treatment unit (6) by pipelines.

5. The cleaning apparatus for deposited impurities in a lead cooling system according to claim 4, characterized in that, The heater (51) preheats the cleaning fluid to 20-70°C before injecting it into the lead cooling system (100).

6. The cleaning apparatus for deposited impurities in a lead cooling system according to claim 5, characterized in that, The waste gas treatment unit (6) includes a condenser (61), an activated carbon adsorber (62), and an exhaust valve (64) for treating waste gas; the condenser (61) is connected to the waste gas generated by the top filling tank (2), the material mixing tank (23), the waste liquid treatment pool (42), and the pressure stabilizing container (50), and the waste liquid generated by condensing the waste gas is introduced into the waste liquid storage pool.

7. The cleaning apparatus for deposited impurities in a lead cooling system according to claim 6, characterized in that, The cooling medium of the condenser (61) is cooling water (63).

8. The cleaning apparatus for deposited impurities in a lead cooling system according to claim 7, characterized in that, The gas exiting the condenser (61) is fed into the activated carbon adsorber (62) for further purification and adsorption of the waste gas.

9. The cleaning apparatus for deposited impurities in a lead cooling system according to claim 8, characterized in that, The negative pressure air pump (7) is connected to the activated carbon adsorber (62).

10. A method for cleaning deposited impurities in a lead cooling system, characterized in that, Includes the following steps: Step 1: Prepare the cleaning solution by mixing the following solutions in the material mixing tank (23) by volume percentage: 10-40% acetic acid, 1-15% hydrogen peroxide, 0.5-30% ethanol, and make up the remainder with deionized water. Step 2: Filling with liquid. Before filling with liquid, use a transfer pump (24) to transfer the cleaning liquid from the material mixing tank (23) to the top filling tank (2), and then inject the cleaning liquid into the top pipe of the pressure stabilizing container (50) and the lead cooling system (100), while simultaneously venting air through the exhaust valve (64). Step 3: Start the sludge circulation cleaning pump (1) to circulate the cleaning liquid in the system, turn on the heater (51) to gradually heat the cleaning liquid to 20-70℃, and circulate for 2-12 hours; during this process, the waste gas generated is continuously treated by the waste gas treatment unit (6), and the pressure stabilizing container (50) and waste liquid storage tank (4) are kept under slight negative pressure by the negative pressure suction device (7); Step 4: Stop the circulation, let it settle, and then discharge the waste liquid into the waste liquid storage tank (4) through the bottom drain pipe (3) for neutralization and sedimentation treatment; Step 5: Rinse the lead-cooled system pipes and equipment with clean water until the pH value of the rinsing water is neutral, and collect the rinsing water into the waste liquid storage tank (4) for neutralization and sedimentation treatment. The waste liquid after cleaning is stored in tanks and centrally treated by a qualified hazardous waste treatment unit.

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