Operation method for extracting zinc liquid from zinc pot of hot galvanizing unit

Abstract

The invention relates to an operation method for pumping out molten zinc in a zinc pot of a hot galvanizing unit, which comprises the following steps of: guiding the molten zinc pumped out by a zinc pump into a molten zinc tank through a flow guide pipeline, a flow guide tank and a zinc pumping pipeline, pumping out the molten zinc in the zinc pot, and pumping out the molten zinc in a melting channel of a zinc pot inductor by using a long iron scraper. The zinc liquid is rapidly and conveniently pumped out, the working efficiency of pumping the zinc liquid is improved, the time of pumping the zinc liquid is saved, the liquid pumping cost, the liquid pumping workload and the liquid pumping working intensity are low, smooth replacement of the inductor is guaranteed, waste of the zinc liquid in the zinc pot is avoided, the repeated utilization rate of the zinc pot is improved, the replacement cost of the zinc plating liquid is saved, the zinc pot is prevented from being damaged, and the time of replacing the inductor is saved. The maintenance cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of zinc liquid extraction in a hot-dip galvanizing unit, and in particular to an operating method for extracting zinc liquid in a zinc pot of a hot-dip galvanizing unit. Background Art

[0002] The main function of the zinc pot in a hot-dip galvanizing unit is to hold zinc, melting it into a liquid state through heating. As the steel strip passes through the nose of the furnace and is guided by the zinc pot rollers into the zinc pot, it comes into full contact with the liquid zinc, where a chemical reaction occurs, forming a uniform, dense zinc alloy coating on the metal surface.

[0003] During galvanizing operations, the zinc pot needs to maintain the temperature of the liquid zinc within an appropriate range. Too high or too low a temperature will affect the quality of the coating. Therefore, the zinc pot induction heater plays a vital role in the hot-dip galvanizing unit. Its main function is to provide a stable heat source for the zinc pot.

[0004] After a period of use, the internal consumables of the zinc pot induction heater may develop cracks. The zinc liquid will continue to corrode the consumables, and the cracks will gradually expand, which may eventually cause the zinc liquid to flow into the induction heater and cause damage to the equipment.

[0005] When the zinc pot sensor fails, the zinc liquid will lose its insulation and heating source. If it is not repaired in time, the 300 tons of zinc liquid in the zinc pot will solidify and the zinc pot will be rebuilt for a long time. The solidified zinc liquid will be removed together with the insulation material inside the zinc pot and treated as waste as a whole, resulting in a waste of zinc liquid resources and increased galvanizing costs. Therefore, the sensor should be replaced or repaired in time. When replacing the induction heater, the zinc liquid in the zinc pot must be pumped below the sensor or pumped out before the replacement operation can be carried out. The cost of pumping zinc liquid is high, the pumping efficiency is low, and the pumping time is long. Summary of the Invention

[0006] In order to overcome the deficiencies of the prior art, the present invention provides an operating method for extracting zinc liquid from a zinc pot of a hot-dip galvanizing unit. The zinc liquid extracted by a zinc extraction pump is introduced into a zinc liquid tank through a diversion pipe, a diversion tank and a zinc extraction pipe, the zinc liquid in the zinc pot is extracted, and the zinc liquid in the molten groove of the zinc pot sensor is scooped out using a long iron spatula. The zinc liquid is extracted quickly, ensuring smooth replacement of the sensor, avoiding waste of zinc liquid in the zinc pot, avoiding damage to the zinc pot, saving time for replacing the sensor, and reducing maintenance costs.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] An operating method for extracting zinc liquid from a zinc pot of a hot-dip galvanizing unit, wherein the specific steps of the operating method for extracting zinc liquid from a zinc pot of a hot-dip galvanizing unit are as follows:

[0009] S1. Before zinc extraction, clean the zinc pot, especially the slag in the zinc pot, cover the zinc pot with insulation cover, and use insulation cotton to keep it warm. Leave holes in the insulation cotton at the burner mouth, the dissolving groove of the sensor, and the zinc extraction pump mouth. The zinc liquid temperature should be raised to 485-500℃ in advance.

[0010] S2. Protect the zinc pot roller base, air knife base, and electrical cabinet to prevent damage from high temperature; weld temporary guardrails around the zinc pot; cover the ground with insulation cotton and then cover it with sand to prevent burns and zinc liquid leakage;

[0011] S3. Place the zinc liquid tank containing the zinc liquid in place, fix the diversion tank according to the position of the zinc liquid tank, connect the diversion tank to the diversion pipe, and connect the diversion pipe to the zinc liquid tank. Insulate the diversion pipe to prevent the zinc liquid from solidifying in the diversion pipe.

[0012] S4. Connect the diversion tank to the zinc extraction pipeline and insulate the pipeline to prevent the zinc liquid from solidifying in the pipeline.

[0013] S5. Connect the zinc pump to the power cord, install the cooling device and cooling pipe of the zinc pump; hoist the zinc pump and fix the position of the zinc pump according to the order in which the zinc liquid tanks are loaded with zinc liquid;

[0014] S6. Lift the zinc pump to the zinc liquid surface and preheat for 10 to 20 minutes. Lower it to 200 mm below the zinc liquid and preheat for 5 to 10 minutes. Gradually lower the zinc pump to a depth of 1750 to 1800 mm in the zinc pot. At the same time, align the pump head with the zinc extraction pipeline.

[0015] S7, start the zinc pump to pump the zinc liquid from the zinc pot into the diversion tank, and then guide the zinc liquid into the zinc liquid tank through the diversion tank. After each zinc tank is filled with zinc liquid, adjust the direction of the diversion pipe and replace the zinc liquid tank containing zinc liquid;

[0016] S8. When the zinc liquid level in the zinc pot is 100-120mm lower than the lower edge of the sensor molten groove, stop the zinc pump, turn off the power to the sensor, use a long iron spatula to quickly take out the zinc liquid in the sensor molten groove, and at the same time ignite the burner of the zinc pot to heat and keep the zinc liquid in the zinc pot warm to ensure the fluidity of the zinc liquid in the zinc pot;

[0017] S9. After the zinc liquid in the inductor molten groove is taken out, pull out the zinc extraction pipe and zinc extraction pump, disassemble the zinc extraction pump and zinc extraction pipe, and wait for the zinc liquid in the zinc liquid tank to cool and solidify. When the temperature of the liquid zinc in the zinc liquid tank is lower than 60℃, start to remove the ingots, place them next to the machine and use them to backfill the zinc pot after the induction heater is repaired.

[0018] Furthermore, in step S5, the cooling medium in the cooling device and the cooling pipe is nitrogen.

[0019] Furthermore, in step S5, an anti-unhooking device is provided on the hook head for hoisting the zinc extraction pump.

[0020] Furthermore, in step S7, the zinc liquid tank is monitored for leakage, and sand is used to block leakage.

[0021] Furthermore, in step S7, a thin iron chain and a long hook are used to adjust the direction of the diversion pipe.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1) The zinc liquid extraction method has a simple structure, the zinc liquid is extracted quickly and conveniently, the working efficiency of zinc liquid extraction is improved, the zinc liquid extraction time is saved, the extraction cost is low, the extraction workload is low, and the extraction work intensity is low.

[0024] 2) This method ensures smooth sensor replacement, avoids waste of zinc liquid in the zinc pot, improves the reuse rate of the zinc pot, saves the cost of replacing the galvanizing liquid, avoids damage to the zinc pot, saves time for replacing the sensor, and reduces maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The present invention is a schematic diagram of the structure for extracting zinc liquid from the zinc pot of the hot-dip galvanizing unit furnace.

[0026] Figure 2 It is a plan view of the zinc liquid extraction structure in the zinc pot of the hot-dip galvanizing unit furnace according to the present invention.

[0027] Figure 3 It is a structural schematic diagram of the zinc pot described in the present invention.

[0028] Figure 4 It is a structural schematic diagram of the zinc extraction pump described in the present invention.

[0029] In the figure: 1. Zinc pot; 2. Zinc extraction pipe; 3. Diversion pipe; 4. Diversion tank; 5. Zinc liquid tank; 6. Zinc extraction pump; 7. Electrical cabinet; 8. Sensor. DETAILED DESCRIPTION

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

[0031] like Figures 1-4 As shown, an operating method for extracting zinc liquid from the zinc pot of a hot-dip galvanizing unit is provided. The specific steps of the operating method for extracting zinc liquid from the zinc pot of a hot-dip galvanizing unit are as follows:

[0032] S1. Before zinc extraction, clean the zinc pot 1, especially the slag in the zinc pot 1, cover the zinc pot 1 with insulation cover, and use insulation cotton to keep it warm. Leave holes in advance for the insulation cotton at the burner mouth, the dissolving groove mouth of the sensor 8, and the zinc extraction pump 6. The temperature of the zinc liquid should be raised to 485-500℃ in advance.

[0033] S2. Protect the zinc pot roller base, air knife base, and electrical cabinet 7 to prevent damage from high temperature; weld temporary guardrails around the zinc pot 1; pave the ground with insulation cotton and then cover it with sand to prevent scalding and zinc liquid leakage;

[0034] S3. The zinc liquid tank containing zinc liquid is placed in place, and the diversion tank 4 is fixed according to the position of the zinc liquid tank. The diversion tank 4 is connected to the diversion pipe 3, and the diversion pipe 3 is connected to the zinc liquid tank 5. The diversion pipe 3 is well insulated to prevent the zinc liquid from solidifying in the diversion pipe 3;

[0035] S4, the diversion tank 4 is connected to the zinc extraction pipeline 2, and the zinc extraction pipeline 2 is well insulated to prevent the zinc liquid from solidifying in the zinc extraction pipeline 2;

[0036] S5, zinc pump 6 connected to the power line, install the cooling device and cooling pipe of zinc pump 6; hoist the zinc pump 6, according to the order of zinc liquid tank 5 successively loading zinc liquid, fix the position of zinc pump 6;

[0037] S6. Lift the zinc pump 6 to the zinc liquid surface and preheat for 10 to 20 minutes. Lower it to 200 mm below the zinc liquid and preheat for 5 to 10 minutes. Gradually lower the zinc pump 6 to a depth of 1750 to 1800 mm in the zinc pot 1. At the same time, align the pump head of the zinc pump 6 with the zinc extraction pipe 2.

[0038] S7, start the zinc pump 6 to pump the zinc liquid from the zinc pot 1 into the diversion tank 4, and guide the zinc liquid into the zinc liquid tank 5 through the diversion tank 4. After each zinc liquid tank 5 is filled with zinc liquid, adjust the direction of the diversion pipe 3 and replace the zinc liquid tank 5 containing zinc liquid;

[0039] S8. When the zinc liquid level in the zinc pot 1 is 100-120 mm lower than the lower edge of the melting groove of the sensor 8, the zinc pump 6 is stopped, the sensor 8 is powered off, and the zinc liquid in the melting groove of the sensor 8 is quickly taken out using a long iron spatula. At the same time, the burner of the zinc pot 1 is ignited to heat and keep the zinc liquid in the zinc pot 1 warm to ensure the fluidity of the zinc liquid in the zinc pot 1.

[0040] S9. After the zinc liquid in the molten groove of the inductor 8 is taken out, the zinc extraction pipe 2 and the zinc extraction pump 6 are pulled out, and the zinc extraction pump 6 and the zinc extraction pipe 2 are disassembled. Wait for the zinc liquid in the zinc liquid tank 5 to cool and solidify. When the temperature of the liquid zinc in the zinc liquid tank 5 is lower than 60°C, the ingots are started to be removed and placed next to the machine to be used for backfilling the zinc pot 1 after the induction heater is repaired.

[0041] Furthermore, in step S5, the cooling medium in the cooling device and the cooling pipe is nitrogen.

[0042] Furthermore, in the step S5, the hook head for hoisting the zinc extraction pump 6 is provided with an anti-unhooking device.

[0043] Furthermore, in step S7, the zinc liquid tank 5 is monitored for leakage, and sand is used to block leakage.

[0044] Furthermore, in step S7, a thin iron chain and a long hook are used to adjust the direction of the diversion pipe 3.

[0045] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A method for extracting zinc liquid from a zinc pot of a hot-dip galvanizing unit, characterized in that: The specific steps of the operation method of extracting zinc liquid from the zinc pot of the hot-dip galvanizing unit are as follows: S1. Before zinc extraction, clean the zinc pot, especially the slag in the zinc pot, cover the zinc pot with insulation cover, and use insulation cotton to keep it warm. Leave holes in the insulation cotton at the burner mouth, the dissolving groove of the sensor, and the zinc extraction pump mouth. The zinc liquid temperature should be raised to 485-500℃ in advance. S2. Protect the zinc pot roller base, air knife base, and electrical cabinet equipment to prevent damage from high temperatures; weld temporary guardrails around the zinc pot; and cover the ground with insulation cotton and then sand to prevent scalding and zinc liquid leakage. S3. Place the zinc liquid tank containing the zinc liquid in place, fix the diversion tank according to the position of the zinc liquid tank, connect the diversion tank to the diversion pipe, and connect the diversion pipe to the zinc liquid tank. Insulate the diversion pipe to prevent the zinc liquid from solidifying in the diversion pipe. S4. Connect the diversion tank to the zinc extraction pipeline and insulate the pipeline to prevent the zinc liquid from solidifying in the pipeline. S5. Connect the zinc pump to the power cord, install the cooling device and cooling pipe of the zinc pump; hoist the zinc pump and fix the position of the zinc pump according to the order in which the zinc liquid tanks are loaded with zinc liquid; S6. Lift the zinc pump to the zinc liquid surface and preheat for 10 to 20 minutes. Lower it to 200mm below the zinc liquid and preheat for 5 to 10 minutes. Gradually lower the zinc pump to a depth of 1750 to 1800cm in the zinc pot. At the same time, align the pump head with the zinc extraction pipeline. S7, start the zinc pump to pump the zinc liquid from the zinc pot into the diversion tank, and then guide the zinc liquid into the zinc liquid tank through the diversion tank. After each zinc tank is filled with zinc liquid, adjust the direction of the diversion pipe and replace the zinc liquid tank containing zinc liquid; S8. When the zinc liquid level in the zinc pot is 100-120mm lower than the lower edge of the sensor molten groove, stop the zinc pump, turn off the power to the sensor, use a long iron spatula to quickly take out the zinc liquid in the sensor molten groove, and at the same time ignite the burner of the zinc pot to heat and keep the zinc liquid in the zinc pot warm to ensure the fluidity of the zinc liquid in the zinc pot; S9. After the zinc liquid in the inductor molten groove is taken out, pull out the zinc extraction pipe and zinc extraction pump, disassemble the zinc extraction pump and zinc extraction pipe, and wait for the zinc liquid in the zinc liquid tank to cool and solidify. When the temperature of the liquid zinc in the zinc liquid tank is lower than 60℃, start to remove the ingots, place them next to the machine and use them to backfill the zinc pot after the induction heater is repaired.

2. The method for extracting zinc liquid from a zinc pot of a hot-dip galvanizing unit according to claim 1, characterized in that: In step S5, the cooling medium in the cooling device and the cooling pipe is nitrogen.

3. The method for extracting zinc liquid from a zinc pot of a hot dip galvanizing unit according to claim 1, characterized in that: In the step S5, an anti-unhooking device is provided on the hook head for hoisting the zinc extraction pump.

4. The method for extracting zinc liquid from a zinc pot of a hot dip galvanizing unit according to claim 1, characterized in that: In step S7, the zinc liquid tank is monitored for leakage, and sand is used to block leakage.

5. The method for extracting zinc liquid from a zinc pot of a hot dip galvanizing unit according to claim 1, characterized in that: In step S7, a thin iron chain and a long hook are used to adjust the direction of the diversion pipe.

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