Zinc ash filtering device for hot-dip aluminum-zinc plating furnace nose

Abstract

The utility model discloses a zinc ash filtering device for a hot-dip aluminum-zinc plating furnace nose, which is characterized in that a connecting pipeline of the zinc ash filtering device is connected with a hot-dip aluminum-zinc plating furnace nose area, and a first-stage cooling filter, a second-stage centrifugal filter and a third-stage filter element filter are sequentially connected in series and then are arranged between the connecting pipeline and a pumping and discharging circulating fan; the output end of the pumping and discharging circulating fan is connected with a discharging valve and a return valve, the discharging valve discharges the filtered shielding gas, the output end of the return valve is connected with an electric heater, the electric heater heats the filtered shielding gas, and then the shielding gas is returned to the hot-dip aluminum-zinc plating furnace nose area. The electric controller is electrically connected with the first-stage cooling filter, the second-stage centrifugal filter, the third-stage filter element filter, the pumping and discharging circulating fan and the electric heater respectively. According to the device, protective gas in the furnace nose is pumped out, zinc ash is filtered out through multi-stage filtering treatment, the furnace nose is discharged after reaching the pollution discharge standard, and the furnace nose can be conveyed back to the furnace nose for recycling after being heated again, so that the zinc liquid level in the furnace nose is ensured to be clean, and the product quality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of metallurgical processing, in particular to a zinc ash filtering device for a hot-dip aluminum-zinc coating furnace nose. Background Art

[0002] So far, hot-dip galvanizing is the most commonly used and effective process measure for steel anti-corrosion. Since its introduction, hot-dip galvanized steel has been widely used in major industries such as construction and home appliances. As the scope of use continues to expand, the formability and various properties of the product on the steel plate are continuously improved, resulting in the production of aluminum-zinc-plated steel plates that are superior to hot-dip galvanized steel plates in some properties. Alu-zinc-plated steel plates are AL-Zn alloy aluminum-zinc-plated steel plates obtained by hot-dip plating with cold-rolled hard steel plates of various strengths and thicknesses as the substrate. Alu-zinc-plated steel plates are aluminum-zinc-plated steel plates with aluminum-zinc alloy coatings on the surface of the steel plate. They are composed of 55% aluminum, 43.4% zinc and 1.6% silicon solidified at a high temperature of 600°C. The entire structure is composed of aluminum-iron-silicon-zinc, forming a dense quaternary crystal.

[0003] During the production of galvanized zinc, the temperature of the zinc liquid is close to 600℃. The zinc liquid evaporates at this temperature. The evaporated zinc is suspended in the protective atmosphere in the furnace nose. When it is cooled, it condenses into zinc ash. Some of the zinc ash falls on the surface of the zinc liquid, causing zinc ash defects. In severe cases, leakage plating may occur. As the production time increases, zinc continues to evaporate, causing the zinc ash concentration in the protective atmosphere in the furnace nose to increase, seriously affecting product quality. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide a zinc ash filtering device for a hot-dip aluminum-zinc plating furnace nose. The device extracts the protective gas in the furnace nose, and filters out the zinc ash in the protective gas through multi-stage filtering treatment, and discharges it after meeting the sewage discharge standards. The device can also be reheated and sent back to the furnace nose for recycling, thereby ensuring the cleanliness of the zinc liquid level in the furnace nose and improving product quality.

[0005] In order to solve the above technical problems, the utility model provides a zinc ash filtering device for a hot-dip aluminum-zinc coating furnace nose, comprising a hot-dip aluminum-zinc coating furnace nose area, a connecting pipe, a primary cooling filter, a secondary centrifugal filter, a tertiary filter element filter, an exhaust circulation fan, an electric heater and an electrical controller, wherein the connecting pipe is connected to the hot-dip aluminum-zinc coating furnace nose area, the primary cooling filter, the secondary centrifugal filter and the tertiary filter element filter are sequentially connected in series and arranged between the connecting pipe and the exhaust circulation fan, the output end of the exhaust circulation fan is respectively connected to a discharge valve and a return valve, the discharge valve discharges the filtered protective gas from the hot-dip aluminum-zinc coating furnace nose area, the output end of the return valve is connected to the electric heater, the electric heater heats the filtered protective gas from the hot-dip aluminum-zinc coating furnace nose area and then returns it to the hot-dip aluminum-zinc coating furnace nose area, and the electrical controller is respectively electrically connected to the primary cooling filter, the secondary centrifugal filter, the tertiary filter element filter, the exhaust circulation fan and the electric heater.

[0006] Furthermore, the connecting pipe is a high temperature resistant and corrosion resistant stainless steel pipe, and metal expansion joints are respectively provided at both ends of the connecting pipe.

[0007] Furthermore, the electrical controller is a PLC controller, and controls the extraction flow rate of the protective gas in the nose area of ​​the hot-dip galvanizing furnace through an exhaust circulation fan according to the temperature and pressure changes of the protective gas in the nose area of ​​the hot-dip galvanizing furnace.

[0008] Since the utility model adopts the above technical scheme, the zinc ash filtering device for the hot-dip galvanizing furnace nose of the utility model is connected with the hot-dip galvanizing furnace nose area, the first-stage cooling filter, the second-stage centrifugal filter and the third-stage filter element filter are connected in series in sequence and arranged between the connecting pipe and the exhaust circulation fan, the exhaust circulation fan output end is respectively connected with the discharge valve and the return valve, the discharge valve discharges the filtered protective gas in the hot-dip galvanizing furnace nose area, the return valve output end is connected with the electric heater, the electric heater heats the filtered protective gas in the hot-dip galvanizing furnace nose area and then returns it to the hot-dip galvanizing furnace nose area, and the electrical controller is respectively electrically connected with the first-stage cooling filter, the second-stage centrifugal filter, the third-stage filter element filter, the exhaust circulation fan and the electric heater. The utility model extracts the protective gas in the furnace nose, filters out the zinc ash in the protective gas through multi-stage filtering, and discharges it when it reaches the sewage discharge standard, and can also be heated again and sent back to the furnace nose for recycling, so as to ensure the cleanliness of the zinc liquid level in the furnace nose and improve the product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The present invention is further described in detail below in conjunction with the accompanying drawings and implementation examples:

[0010] Figure 1 This is a schematic diagram of the zinc ash filtering device for the hot-dip aluminum-zinc coating furnace nose of the utility model. DETAILED DESCRIPTION

[0011] Implementation example Figure 1 As shown, the utility model of the zinc ash filtering device for the hot-dip aluminum-zinc coating furnace nose comprises a hot-dip aluminum-zinc coating furnace nose area 1, a connecting pipe 2, a primary cooling filter 3, a secondary centrifugal filter 4, a tertiary filter element filter 5, an exhaust circulation fan 6, an electric heater 7 and an electrical controller 8, wherein the connecting pipe 2 is connected to the hot-dip aluminum-zinc coating furnace nose area 1, the primary cooling filter 3, the secondary centrifugal filter 4 and the tertiary filter element filter 5 are sequentially connected in series and arranged between the connecting pipe 2 and the exhaust circulation fan 6, and the exhaust circulation fan 6 The output end is respectively connected to a discharge valve 61 and a return valve 62, wherein the discharge valve 61 discharges the filtered protective gas from the nose area 1 of the hot-dip aluminum-zinc coating furnace, and the output end of the return valve 62 is connected to the electric heater 7, wherein the electric heater 7 heats the filtered protective gas from the nose area 1 of the hot-dip aluminum-zinc coating furnace and then returns the filtered protective gas to the nose area 1 of the hot-dip aluminum-zinc coating furnace, and the electrical controller 8 is respectively connected to the primary cooling filter 3, the secondary centrifugal filter 4, the tertiary filter element filter 5, the exhaust circulation fan 6 and the electric heater 7.

[0012] Preferably, the connecting pipe 2 is a high temperature resistant and corrosion resistant stainless steel pipe, and metal expansion joints are respectively provided at both ends of the connecting pipe 2. The metal expansion joints are used to compensate for the thermal expansion of the connecting pipe and the influence of vibration on the sealing of the connecting pipe.

[0013] Preferably, the electrical controller 8 is a PLC controller, and according to the temperature and pressure changes of the protective gas in the hot-dip galvanizing furnace nose area, the extraction flow of the protective gas in the hot-dip galvanizing furnace nose area 1 is controlled by the exhaust circulation fan 6. The PLC controller controls and monitors the extraction flow, temperature change, and pressure change of the protective gas in the furnace nose through program settings, thereby achieving automatic control while meeting process control.

[0014] This device is connected to the nose of the hot-dip galvanizing furnace by a connecting pipe, and the protective gas in the nose of the furnace is extracted by an exhaust circulation fan. The protective gas is filtered to remove zinc ash through three-stage filtration. The first-stage cooling filter uses a cooling method to filter the protective gas extracted by the exhaust circulation fan. Most of the zinc ash in the protective gas will be separated from the protective gas due to the temperature drop, and some zinc ash with small particles will increase in size due to the temperature drop; the protective gas after the first-stage filtration enters the second-stage centrifugal filter. The second-stage filtration uses a centrifugal method to separate the zinc ash particles containing a certain weight in the protective gas from the protective gas, which plays a role in further reducing the zinc ash concentration in the protective gas; the protective gas after the previous two-stage filtration enters the third-stage filter element filter. At this time, most of the zinc ash is filtered out, and some extremely small zinc ash particles in the protective gas are brought to the third-stage filter element filter. The three-stage filtration is a filtration method with a filter element. Through the filtration accuracy design of the filter element, the remaining zinc ash particles in the protective gas are intercepted from the protective gas, which plays a role in cleaning the protective gas.

[0015] After the protective gas passes through multi-stage filtration, the zinc ash in the protective gas is filtered out, and the protective gas can meet the urban emission standards. At this time, the protective gas can be discharged through the discharge valve; at the same time, in order to reduce the consumption of protective gas in galvanizing production, this device is equipped with an electric heater. The filtered protective gas is then heated by the electric heater and sent back to the hot-dip galvanizing furnace nose after reaching the process control temperature, thereby realizing the reuse of the protective gas.

[0016] The electrical controller in this device is an independent PLC controller. Through the program setting of the PLC controller, the factors such as the extraction flow rate of the protective gas, temperature changes and pressure changes in the furnace nose are controlled and monitored, thereby achieving automatic control while meeting process control.

[0017] This device can effectively reduce the zinc ash concentration of the protective gas in the nose of the galvanized furnace, and can operate stably for a long period of time, and can return the filtered protective gas to the furnace for use, reducing the consumption of protective gas and reducing the cost per ton of steel produced. It provides a stable and reliable technical solution for the zinc ash control method under the galvanized production process; it reduces the probability of internal defects in the nose of the furnace, makes the maintenance cycle of the nose of the furnace more reasonable, and improves the quality of hot-dip galvanized products.

Claims

1. A zinc ash filtering device for a hot-dip galvanizing furnace nose, including a hot-dip galvanizing furnace nose area, characterized in that: It also includes a connecting pipe, a primary cooling filter, a secondary centrifugal filter, a tertiary filter element filter, an exhaust circulation fan, an electric heater and an electrical controller. The connecting pipe is connected to the nose area of ​​the hot-dip aluminum-zinc coating furnace. The primary cooling filter, the secondary centrifugal filter and the tertiary filter element filter are sequentially connected in series and arranged between the connecting pipe and the exhaust circulation fan. The output end of the exhaust circulation fan is respectively connected to a discharge valve and a return valve. The discharge valve discharges the filtered protective gas from the nose area of ​​the hot-dip aluminum-zinc coating furnace. The output end of the return valve is connected to the electric heater. The electric heater heats the filtered protective gas from the nose area of ​​the hot-dip aluminum-zinc coating furnace and then returns it to the nose area of ​​the hot-dip aluminum-zinc coating furnace. The electrical controller is electrically connected to the primary cooling filter, the secondary centrifugal filter, the tertiary filter element filter, the exhaust circulation fan and the electric heater respectively.

2. The hot-dip galvanizing furnace nose zinc ash filtering device according to claim 1 is characterized in that: The connecting pipe is a high temperature resistant and corrosion resistant stainless steel pipe, and both ends of the connecting pipe are respectively provided with metal expansion joints.

3. The zinc ash filtering device for hot-dip galvanizing furnace nose according to claim 1 or 2, characterized in that: The electrical controller is a PLC controller, and controls the extraction flow of the protective gas in the nose area of ​​the hot-dip galvanizing furnace through an exhaust circulation fan according to the temperature and pressure changes of the protective gas in the nose area of ​​the hot-dip galvanizing furnace.

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