A cleaning method and apparatus for an offline preparation water circulation system of a continuous casting machine

Abstract

A cleaning method and device for an offline preparation water circulation system of a continuous casting machine, comprising the following method steps: 1) heating citric acid cleaning agent to 80-90 DEG C, pumping into the offline preparation water circulation system of the continuous casting machine, and flushing for 12-15 hours; 2) discharging the citric acid cleaning agent in the offline preparation water circulation system of the continuous casting machine, pumping a facility degree of alkaline bactericide heated to 35-55 DEG C into the offline preparation water circulation system of the continuous casting machine, and flushing for 1-3 hours. The application adopts a mobile vehicle form, carries out cleaning and sterilization treatment on the scale in the cooling circulation pipeline system of the continuous casting machine, improves the cooling effect, prolongs the online service life of the continuous casting machine, improves the surface quality of the casting blank, and can save the occupied area of a cleaning operation station.

Description

Technical Field

[0001] This invention relates to the field of mechanical manufacturing technology, and in particular to a cleaning method and apparatus for an offline preparation water circulation system of a continuous casting machine. Background Technology

[0002] After a period of use, scale and rust will form on the metal surface of the continuous casting machine's cooling circulation system. This is because the water contains a certain amount of calcium and magnesium salts, such as bicarbonates, carbonates, sulfates, chlorides, silicates, and phosphates, as well as silt and organic matter. These salts undergo physical and chemical changes during heating. When the sulfate and chloride content in the water is high, they evaporate continuously within the casting tank and continuous casting rolls, exceeding their saturation concentration limit and precipitating out. They then adhere and deposit on the inner wall of the casting machine's cooling system, gradually forming hard, insoluble scale. Calcium bicarbonate in the water decomposes into insoluble calcium carbonate as the water temperature rises: Ca(HCO3)2 ⇌ CaCO3 + CO2↑ + H2O. Scale is a poor conductor; its thermal conductivity is much lower than that of metals. The thermal resistance of scale is 50-100 times that of steel, 100-200 times that of brass, and 300-400 times that of aluminum and copper.

[0003] Scale buildup affects the thermal conductivity of heated surfaces. It increases water flow resistance within pipes and can sometimes even block them. Scale deposits inside pipes reduce the cross-sectional area of ​​the water flow, increase flow resistance, increase power consumption, and reduce the production capacity of various industrial equipment. Prolonged operation of the secondary cooling water system can cause blockages. The high temperatures inside and on the surface of the primary cooling water system and continuous casting rollers over extended periods can easily lead to bearing housings, bearings, and their components seizing and failing to rotate, resulting in quality defects such as scratches on the surface of the cast billet. Furthermore, pipes with long-term scale accumulation can harbor a large number of bacteria, which both pollute the circulating water and easily corrode the pipes.

[0004] During offline maintenance of existing continuous casting machines, the cleaning of the cooling water circulation system was carried out at fixed stations. Each station occupied a large area, thus limiting the number of stations and resulting in low cleaning efficiency. In addition, simple acid pickling agents were used, which required a long pickling time, had an unsatisfactory descaling effect, and could not prevent bacterial corrosion, leading to poor cooling performance, short equipment lifespan, and even affecting the surface quality of the cast billets. Summary of the Invention

[0005] The purpose of this invention is to provide a cleaning method and device for the offline preparation water circulation system of a continuous casting machine. The method uses a mobile vehicle to clean and disinfect the scale in the cooling circulation pipeline system of the continuous casting machine, thereby improving the cooling effect, extending the online service life of the continuous casting machine, and improving the surface quality of the cast billet. It can also save the area occupied by the cleaning operation station.

[0006] To achieve the above objectives, the present invention employs the following technical solution:

[0007] A cleaning method for an offline preparation water circulation system of a continuous casting machine includes the following steps:

[0008] 1) Heat the citric acid cleaning agent to 80-90℃ and pump it into the offline preparation water circulation system of the continuous casting machine. The rinsing treatment time is 12-15 hours.

[0009] 2) Discharge the citric acid cleaning agent from the offline preparation water circulation system of the continuous casting machine, and pump the alkaline bactericide heated to 35-55°C into the offline preparation water circulation system of the continuous casting machine. The rinsing treatment time is 1-3 hours.

[0010] The citric acid cleaning agent is a 6% to 8% aqueous solution of citric acid.

[0011] The citric acid in the citric acid cleaning agent is edible citric acid. The citric acid cleaning agent is used for continuous rinsing at a speed of 1 to 1.2 m / s.

[0012] The alkaline bactericide consists of the following components and weight percentages: 3-12 parts potassium ferrate, 7-13 parts sodium polyaspartate, 15-30 parts diethylhydroxylamine, 8-15 parts sodium gluconate monomer, and 25-45 parts deionized water.

[0013] The dosage of the alkaline bactericide is 15–30 mg / L.

[0014] A cleaning method for an offline preparation water circulation system of a continuous casting machine uses an apparatus including a citric acid cleaning tank, a bactericide cleaning tank, a trolley, a filter cup, a thermal oil heater, a main circulating flushing outlet pipe, and a circulating flushing return pipe. Both the citric acid cleaning tank and the bactericide cleaning tank are equipped with heating partitions, which are connected to the thermal oil heater via the thermal oil circulation pipe. The filter cup is hung on the upper part of the citric acid cleaning tank. The upper parts of both the citric acid cleaning tank and the bactericide cleaning tank have return flow inlets, and the filter cup also has a corresponding return flow inlet. The circulating flushing... One end of the rinsing return pipe is detachably connected to the offline preparation water circulation system of the continuous casting machine, and the other end of the circulating rinsing return pipe is inserted into the return inlet hole. The citric acid cleaning tank is equipped with a citric acid cleaning agent outlet pipe, and the bactericide cleaning tank is equipped with a bactericide outlet pipe. The citric acid cleaning agent outlet pipe and the bactericide outlet pipe are respectively connected to the circulating rinsing main outlet pipe through a cleaning agent circulation pump. The other end of the circulating rinsing main outlet pipe is detachably connected to the offline preparation water circulation system of the continuous casting machine. The citric acid cleaning tank, the bactericide cleaning tank, and the heat transfer oil heater are all placed on a trolley.

[0015] The filter cup includes a filter cup body, an outer edge fixed to the upper end of the filter cup body, a hook fixedly connected to the outer edge, and a positioning pin. The filter cup body is inside the citric acid cleaning tank, the outer edge overlaps the upper end of the citric acid cleaning tank, and the positioning pin is fixed to the bottom of the outer edge. A positioning plate is provided on the outer wall of the citric acid cleaning tank. When the positioning pin is inserted into the positioning hole on the positioning plate, the position of the return flow inlet hole on the filter cup coincides with the position of the return flow inlet hole on the citric acid cleaning tank.

[0016] It also includes a citric acid cleaning bucket lid, the upper end of which is provided with a hook.

[0017] It also includes a disinfectant cleaning tank lid, the upper end of which is equipped with a hook.

[0018] Practical experience has shown that when the concentration of the citric acid solution of this invention is 6%-8%, and the cleaning time is 12-15 hours, the descaling effect on the pipeline can achieve a very ideal effect, and the cleaning efficiency is also very high, which can save cleaning and maintenance time to the maximum extent.

[0019] The use of sodium gluconate in the disinfectant of this invention results in a decrease in the corrosion rate of carbon steel test plates during the heating process from 50°C to 80°C. This invention utilizes this property of sodium gluconate to effectively protect the heated metal surfaces of the offline preparation water circulation system of the continuous casting machine, reducing the occurrence of high-temperature corrosion on these metal surfaces.

[0020] Sodium polyaspartate (SPA) exhibits acid and alkali stability, high-temperature resistance, and chemical corrosion resistance. In compound formulations, it acts as a stabilizer for sodium gluconate, extending its service life. SPA itself also possesses strong chelating, dispersing, and adsorption properties for ions, preventing corrosion of metal equipment. Furthermore, SPA is phosphorus-free, non-toxic, pollution-free, and fully biodegradable, making it a green and environmentally friendly cleaning agent.

[0021] Potassium ferrate possesses excellent bactericidal, decolorizing, deodorizing, and purifying effects. It is stable and does not easily decompose under alkaline solution conditions. Its strong oxidizing properties remove microorganisms from water, resulting in a significant bactericidal effect. It is non-toxic and suitable for use at high pH levels. The diethylhydroxylamine in this invention is alkaline after dissolution, acting as a stabilizer for potassium ferrate. Diethylhydroxylamine itself can also remove oxygen from water, inhibiting the growth of nitrifying bacteria, and forms a passivation film on metal surfaces, providing both deoxygenation and protection.

[0022] The compound disinfectant in this invention is matched under conditions of 35-55℃, which enhances its own effect and also stimulates the overall stabilizer properties. After being applied in the system, it can form a relatively stable molecular film on the metal surface. In the continuous casting machine offline preparation water circulation system, a molecular film protective layer is formed on the metal surface, which can protect the surface of metal components for a long time, inhibit corrosion reaction, and release bactericidal substances for a long time.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] 1) This invention improves the fixed workstation of the cleaning operation into a "horizontal mobile vehicle for cleaning cooling water circulation pipeline system", which efficiently, conveniently and quickly inputs the cleaning fluid into the pipeline to achieve the effect of cleaning the pipeline, and saves the area occupied by the cleaning operation workstation.

[0025] 2) Diluted edible citric acid is used to heat and rinse the continuous casting machine to remove scale from the nozzles and base cooling water system, as well as the continuous casting rollers. This method is safe, non-toxic, and environmentally friendly.

[0026] 3) In this invention, the method of first acid washing to remove scale and then alkaline washing to remove bacteria is adopted. First, the scale is softened by acid washing and flushed out of the pipe and collected by the filter cup to separate it from the acid. The separated acid can be collected and reused, and the scale can be centrally treated. Then, the pipe after descaling is sterilized. The acid washing to remove scale and the alkaline washing to remove bacteria are carried out separately, which can save the amount of sterilizing agent used.

[0027] 4) After the continuous casting machine's offline preparation cooling water circulation pipeline system is cleaned by the cleaning horizontal mobile vehicle, the blockage rate of the online operation spray system, base cooling water and other water pipe systems is reduced by 95%, extending the online service time and reducing the continuous casting machine's offline rate by more than 60%. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the device in this invention.

[0029] In the diagram: 1-Hook, 2-Cleanser cleaning tank lid, 3-Positioning pin, 4-Positioning plate, 5-Circulating flushing return pipe, 6-Heat transfer oil circulation pump, 7-Filter cup, 8-Heating partition, 9-Heat transfer oil circulation pipe, 10-Heat transfer oil heater, 11-Handle, 12-Trolley, 13-Citrate acid cleaning tank lid, 14-Citrate acid cleaning tank heat transfer oil circulation branch pipe, 15-Cleanser cleaning tank, 16-Cleanser circulation pump, 17-Circulating flushing main outlet pipe, 18-Cleanser cleaning tank heat transfer oil circulation branch pipe, 19-Citrate acid cleaning agent outlet pipe, 20-Cleanser outlet pipe, 21-Citrate acid cleaning tank, 22-Valve, 23-Outer edge. Detailed Implementation

[0030] The embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0031] A cleaning method for an offline preparation water circulation system of a continuous casting machine includes the following steps:

[0032] 1) The citric acid cleaning agent is heated to 80-90°C using heat transfer oil and then pumped into the offline preparation water circulation system of the continuous casting machine. The rinsing time is 12-15 hours. The citric acid cleaning agent is a 6%-8% citric acid aqueous solution. The citric acid in the cleaning agent is edible citric acid. The citric acid cleaning agent is continuously circulated at a speed of 1-1.2 m / s.

[0033] Connect the circulating flushing return pipe 5 and the circulating flushing main outlet pipe 17 to the continuous casting machine offline preparation water circulation system. First, insert the circulating flushing return pipe 5 into the return inlet hole of the citric acid cleaning tank 21, close the valve 22 on the bactericide outlet pipe 20, open the valve 22 on the citric acid cleaning agent outlet pipe 19, and send the citric acid cleaning agent in the citric acid cleaning tank 21 into the continuous casting machine offline preparation water circulation system for flushing through the cleaning agent circulation pump 16 on the citric acid cleaning agent outlet pipe 19. The flushing water returns to the citric acid cleaning tank 21, and after the scale is filtered by the filter cup 7, the separated citric acid cleaning agent flows into the lower part of the citric acid cleaning tank 21 for circulation cleaning.

[0034] After cleaning, the lid 13 of the citric acid cleaning tank is lifted by hook 1, and the filter cup 7 is removed from the citric acid cleaning tank 21 to collect and process the filtered scale.

[0035] 2) Close the cleaning agent circulation pump 16 and valve 22 on the citric acid cleaning agent outlet pipe 19, disconnect the main outlet pipe 17 of the circulating flushing from the continuous casting machine offline preparation water circulation system, flush the continuous casting machine offline preparation water circulation system with clean water until the outflowing water becomes clear, and the flushing water can be discharged into the empty bucket.

[0036] After draining the citric acid cleaning agent from the offline preparation water circulation system of the continuous casting machine, reconnect the main outlet pipe 17 of the circulating flushing to the offline preparation water circulation system of the continuous casting machine. Open the valve 22 on the bactericide outlet pipe 20 and the cleaning agent circulation pump 16. Insert the circulating flushing return pipe 5 into the return inlet hole of the bactericide cleaning tank. Pump the alkaline bactericide heated to 35-55°C into the offline preparation water circulation system of the continuous casting machine. The flushing treatment time is 1-3 hours.

[0037] The alkaline bactericide comprises, by weight, 3-12 parts potassium ferrate, 7-13 parts sodium polyaspartate, 15-30 parts diethylhydroxylamine, 8-15 parts sodium gluconate monomer, and 25-45 parts deionized water. The dosage of the alkaline bactericide is 15-30 mg / L.

[0038] A cleaning method for an offline preparation water circulation system of a continuous casting machine uses an apparatus including a citric acid cleaning tank 21, a bactericide cleaning tank 15, a trolley 12, a filter cup 7, a thermal oil heater 10, a circulating flushing main outlet pipe 17, and a circulating flushing return pipe 5. Both the citric acid cleaning tank 21 and the bactericide cleaning tank 15 are equipped with heating partitions 8, which are connected to the thermal oil heater 10 via a thermal oil circulation pipe 9. The filter cup 7 is hung on the upper part of the citric acid cleaning tank 21. The upper parts of both the citric acid cleaning tank 21 and the bactericide cleaning tank 15 are provided with return flow inlets, and the corresponding positions of the filter cup 7 are also provided with return flow inlets. One end of the flushing return pipe 5 is detachably connected to the offline preparation water circulation system of the continuous casting machine, and the other end of the circulating flushing return pipe 5 is inserted into the return inlet hole. The citric acid cleaning tank 21 is provided with a citric acid cleaning agent outlet pipe 19, and the bactericide cleaning tank 15 is provided with a bactericide outlet pipe 20. The citric acid cleaning agent outlet pipe 19 and the bactericide outlet pipe 15 are respectively connected to the circulating flushing main outlet pipe 17 through the cleaning agent circulation pump 16. The other end of the circulating flushing main outlet pipe 17 is detachably connected to the offline preparation water circulation system of the continuous casting machine. The citric acid cleaning tank 21, the bactericide cleaning tank 15, and the heat transfer oil heater 10 are all placed on a trolley.

[0039] The filter cup 7 includes a filter cup body, an outer edge 23 fixed to the upper end of the filter cup body, a hook 1 fixedly connected to the outer edge 23, and a positioning pin 3. The filter cup body is inside the citric acid cleaning tank 21. The outer edge 23 overlaps the upper end of the citric acid cleaning tank 21. The positioning pin 3 is fixed to the bottom of the outer edge 23. A positioning plate 4 is provided on the outer wall of the citric acid cleaning tank 21. When the positioning pin 3 is inserted into the positioning hole on the positioning plate 4, the position of the return flow inlet hole on the filter cup 7 coincides with the position of the return flow inlet hole on the citric acid cleaning tank 21.

[0040] The positioning pin 3 and the positioning plate 4 are used to position the filter cup 7 and the two return flow inlets on the citric acid cleaning tank 21 so that the filter cup 7 and the citric acid cleaning tank 21 can be aligned when the filter cup 7 is installed in the citric acid cleaning tank 21, so as to facilitate the insertion of the circulating flushing return pipe 5 into the filter cup 7 and the citric acid cleaning tank 21.

[0041] It also includes a citric acid cleaning bucket lid 13, the upper end of which is provided with a hook 1.

[0042] It also includes a disinfectant cleaning tank lid 2, the upper end of which is provided with a hook 1.

[0043] The heat transfer oil circulation pipe 9 connects to the citric acid cleaning tank 21 and the disinfectant cleaning tank 15 via the citric acid cleaning tank heat transfer oil circulation branch pipe 14 and the disinfectant cleaning tank heat transfer oil circulation branch pipe 18, respectively. The heat transfer oil circulation pump 6 provides circulation power, forming a circulation system between the citric acid cleaning tank 21 and the disinfectant cleaning tank 15 and the heat transfer oil heater 10. This allows the heated heat transfer oil to heat and keep the washing liquid in the citric acid cleaning tank 21 and the disinfectant cleaning tank 15 warm. Valves are installed on both the citric acid cleaning tank heat transfer oil circulation branch pipe 14 and the disinfectant cleaning tank heat transfer oil circulation branch pipe 18 for shut-off and flow control.

[0044] Previously, the cleaning of the cooling water circulation system during offline maintenance of continuous casting machines was carried out at fixed workstations. Each workstation occupied a large area, thus limiting the number of workstations and resulting in low cleaning efficiency. To more effectively solve the inconvenience caused by the above factors, a mobile cleaning vehicle was invented, which improved the fixed workstations for cleaning operations into a "horizontal mobile vehicle for cleaning cooling water circulation pipeline systems". This vehicle efficiently, conveniently, and quickly introduces cleaning fluid into the pipelines to achieve the desired cleaning effect.

[0045] The frame is made of steel, providing good strength and rigidity. The cleaning agent circulation pump 16 is a pipeline pump with a voltage of 220V, power of 750W, head of 15 meters, flow rate of 5 m³ / h, frequency of 50Hz, diameter of 40mm, speed of 2860 RPM, and insulation class E. The core heating component of the thermal oil heater 10 adopts a tubular bundled structure design, resulting in fast thermal response, high thermal efficiency, and an operating temperature ≤98℃. The filter cup 7 primarily uses a 0.2mm mesh stainless steel conical filter screen.

[0046] Example 1:

[0047] A cleaning method for an offline preparation water circulation system of a continuous casting machine includes the following steps:

[0048] 1) Heat the citric acid cleaning agent to 85°C and pump it into the offline preparation water circulation system of the continuous casting machine. The rinsing time is 12 hours. The citric acid cleaning agent is an 8% citric acid aqueous solution. The citric acid cleaning agent is continuously circulated and rinsed at a speed of 1 m / s.

[0049] 2) Discharge the citric acid cleaning agent from the offline preparation water circulation system of the continuous casting machine, and pump the alkaline bactericide heated to 40°C into the offline preparation water circulation system of the continuous casting machine for 3 hours.

[0050] The alkaline bactericide consists of the following components and weight percentages: 6 parts potassium ferrate, 10 parts sodium polyaspartate, 20 parts diethylhydroxylamine, 12 parts sodium gluconate monomer, and 40 parts deionized water. The dosage of the alkaline bactericide is 20 mg / L.

[0051] After sterilization, there is no need to discharge the bactericide from the offline preparation water circulation system of the continuous casting machine. It can be directly connected to the circulating cooling water, and the bactericide remaining in the circulating cooling water can continue to maintain its sterilization effect.

[0052] Example 2:

[0053] A cleaning method for an offline preparation water circulation system of a continuous casting machine includes the following steps:

[0054] 1) Heat the citric acid cleaning agent to 80°C and pump it into the offline preparation water circulation system of the continuous casting machine. The rinsing time is 14 hours. The citric acid cleaning agent is a 6% citric acid aqueous solution. The citric acid cleaning agent is continuously circulated and rinsed at a speed of 1.1 m / s.

[0055] 2) Discharge the citric acid cleaning agent from the offline preparation water circulation system of the continuous casting machine, and pump the alkaline bactericide heated to 50°C into the offline preparation water circulation system of the continuous casting machine for 2 hours.

[0056] The alkaline bactericide consists of the following components by weight: 11 parts potassium ferrate, 12 parts sodium polyaspartate, 26 parts diethylhydroxylamine, 12 parts sodium gluconate monomer, and 35 parts deionized water. The dosage of the alkaline bactericide is 25 mg / L. After sterilization, the bactericide does not need to be discharged from the offline preparation water circulation system of the continuous casting machine; it can be directly connected to the circulating cooling water. The residual bactericide in the circulating cooling water can maintain its bactericidal effect.

[0057] Example 3:

[0058] A cleaning method for an offline preparation water circulation system of a continuous casting machine includes the following steps:

[0059] 1) Heat the citric acid cleaning agent to 90°C and pump it into the offline preparation water circulation system of the continuous casting machine. The rinsing time is 13 hours. The citric acid cleaning agent is a 6% citric acid aqueous solution. The citric acid cleaning agent is continuously circulated and rinsed at a speed of 1 m / s.

[0060] 2) Discharge the citric acid cleaning agent from the offline preparation water circulation system of the continuous casting machine, and pump the alkaline bactericide heated to 38°C into the offline preparation water circulation system of the continuous casting machine for 1 hour.

[0061] The alkaline bactericide consists of the following components by weight: 8 parts potassium ferrate, 8 parts sodium polyaspartate, 25 parts diethylhydroxylamine, 11 parts sodium gluconate monomer, and 30 parts deionized water. The dosage of the alkaline bactericide is 15 mg / L. After sterilization, the bactericide does not need to be discharged from the offline preparation water circulation system of the continuous casting machine; it can be directly connected to the circulating cooling water. The residual bactericide in the circulating cooling water can maintain its bactericidal effect.

[0062] The sterilization effect and duration after cleaning in Examples 1-3 are shown in Table 1.

[0063]

Claims

1. A cleaning method for an off-line conditioning water circulation system of a continuous caster, characterized in that, The method comprises the following steps: 1) heating the citric acid cleaning agent to 80-90 DEG C, and pumping it into the continuous casting machine offline conditioning water circulation system, and the flushing treatment time is 12-15 hours; 2) discharging the citric acid cleaning agent in the continuous casting machine offline conditioning water circulation system, pumping the alkaline sterilizing agent heated to 35-55 DEG C into the continuous casting machine offline conditioning water circulation system, and the flushing treatment time is 1-3 hours; The composition and weight fraction of the alkaline sterilizing agent are as follows: 3-12 parts of potassium ferrate, 7-13 parts of polyaspartic acid sodium, 15-30 parts of diethyl hydroxylamine, 8-15 parts of monomer sodium gluconate, and 25-45 parts of deionized water.

2. A cleaning method of an off-line conditioning water circulation system of a continuous caster according to claim 1, characterized in that, The citric acid cleaning agent is a 6%-8% citric acid aqueous solution.

3. A cleaning method of an off-line conditioning water circulation system of a continuous caster according to claim 1 or 2, characterized in that, The citric acid in the citric acid cleaning agent is edible citric acid, and the citric acid cleaning agent in step 1) is continuously circulated and flushed at a speed of 1-1.2 m / s.

4. The method of claim 1, wherein the method further comprises: The dosage of the alkaline sterilizing agent is 15-30 mg / L.

5. An apparatus for use in a cleaning method of an off-line conditioning water circulation system of a continuous caster as claimed in any one of claims 1 to 4, characterized in that, The device comprises a citric acid cleaning barrel, a sterilizing agent cleaning barrel, a trolley, a filter screen cup, a heat conducting oil heater, a circulating flushing total outlet pipeline, and a circulating flushing return pipeline. The citric acid cleaning barrel and the sterilizing agent cleaning barrel are both provided with a heating layer. The heating layer is connected with the heat conducting oil heater through a heat conducting oil circulation pipeline. The filter screen cup is hung on the upper part of the citric acid cleaning barrel. The upper part of the citric acid cleaning barrel and the sterilizing agent cleaning barrel is provided with a return inlet hole. The corresponding position of the filter screen cup is also provided with a return inlet hole. One end of the circulating flushing return pipeline is detachably connected with the continuous casting machine offline conditioning water circulation system. The other end of the circulating flushing return pipeline is inserted into the return inlet hole. The citric acid cleaning barrel is provided with a citric acid cleaning agent outlet pipeline. The sterilizing agent cleaning barrel is provided with a sterilizing agent outlet pipeline. The citric acid cleaning agent outlet pipeline and the sterilizing agent outlet pipeline are respectively connected with the circulating flushing total outlet pipeline through a cleaning agent circulating pump. The other end of the circulating flushing total outlet pipeline is detachably connected with the continuous casting machine offline conditioning water circulation system. The citric acid cleaning barrel, the sterilizing agent cleaning barrel, and the heat conducting oil heater are all arranged on the trolley.

6. The apparatus for use in a cleaning method of an off-line conditioning water circulation system of a continuous caster according to claim 5, characterized in that, The filter screen cup comprises a cup body, an outer edge fixed on the upper end of the cup body, a hook fixedly connected with the outer edge, and a positioning pin. The cup body is arranged in the citric acid cleaning barrel. The outer edge is overlapped on the upper end of the citric acid cleaning barrel. The positioning pin is fixed on the bottom of the outer edge. A positioning plate is arranged on the outer wall of the citric acid cleaning barrel. When the positioning pin is inserted into the positioning hole on the positioning plate, the position of the return inlet hole on the filter screen cup is coincided with the position of the return inlet hole on the citric acid cleaning barrel.

7. The apparatus for use in a cleaning method of an off-line conditioning water circulation system of a continuous caster according to claim 5, characterized in that, The device further comprises a citric acid cleaning barrel cover. The upper end of the citric acid cleaning barrel cover is provided with a hook.

8. The apparatus used in the cleaning method of the off-line conditioning water circulation system of a continuous caster according to claim 5, characterized in that, The device further comprises a sterilizing agent cleaning barrel cover. The upper end of the sterilizing agent cleaning barrel cover is provided with a hook.

Images