CN212688161U - Lifting device for atmosphere cleanliness in furnace nose - Google Patents
Lifting device for atmosphere cleanliness in furnace nose Download PDFInfo
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- CN212688161U CN212688161U CN202020916359.4U CN202020916359U CN212688161U CN 212688161 U CN212688161 U CN 212688161U CN 202020916359 U CN202020916359 U CN 202020916359U CN 212688161 U CN212688161 U CN 212688161U
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Abstract
The utility model relates to the equipment field used in the hot dipping process of zinc or cadmium or alloy based on the zinc or cadmium, in particular to a device for improving the cleanliness of the atmosphere in a furnace nose. The utility model provides a hoisting device of atmosphere cleanliness in stove nose, includes stove nose (1), zinc pot (2), hot tensioning roller room (3), goes up turn to roller (41) and lower turn to roller (42), characterized by: the furnace is characterized by further comprising a gas cooler (7), a secondary filter (8) and an air exhaust fan (9), wherein a gas return pipe (61) and an exhaust pipe (62) are sequentially arranged from top to bottom below the furnace nose (1), the other end of the exhaust pipe (6) is connected with the gas cooler (7), and the gas cooler (7) is connected with the secondary filter (8) through a gas conveying pipe. The utility model has low zinc ash concentration and high hot-dip coating quality.
Description
Technical Field
The utility model relates to the equipment field used in the hot dipping process of zinc or cadmium or alloy based on the zinc or cadmium, in particular to a device for improving the cleanliness of the atmosphere in a furnace nose.
Background
Continuous hot dip galvanizing is a surface treatment technique in which a metal is continuously annealed and then hot-dip galvanized on the surface of the metal. As shown in FIG. 1, in the conventional continuous hot dip galvanizing, a furnace nose 1 is a device for connecting an annealing furnace and a zinc pot 2, one end of the furnace nose 1 is connected to a hot stretching roller chamber 3 of the annealing furnace, and the other end of the furnace nose 1 is inserted into the zinc pot 2. The strip steel 5 enters the furnace nose 1 through the upper steering roller 41 in the hot tensioning roller chamber 3 and then enters the zinc pot 2 through the furnace nose 1, and the strip steel 5 finishes hot galvanizing in the zinc pot 2 and leaves the zinc pot 2 after being steered by the lower steering roller 42 in the zinc pot 2.
During continuous hot galvanizing operation, the zinc liquid 21 in the zinc pot 2 is in a high-temperature molten state, the temperature of the zinc liquid is generally higher than the melting point of metal, the zinc liquid is continuously evaporated into gaseous zinc vapor, the zinc vapor rises to meet low-temperature protective gas and is condensed to become granular solid commonly called zinc ash, the zinc ash drops on the zinc liquid surface and adheres to the inner wall of the furnace nose after being formed, and the zinc ash adhered to the inner wall of the furnace nose also frequently drops on the surface of strip steel and the zinc liquid surface to a certain degree. The zinc ash can cause quality defects of plating leakage of particles on the galvanized surface and the like in the galvanizing process of strip steel, and the yield of unit products is seriously influenced. Therefore, the control of the zinc ash concentration in the furnace nose is one of the key links of the quality control of the hot galvanizing unit products.
The current technical measures commonly used for controlling the concentration of zinc ash in the furnace nose are as follows: the humidifying device is adopted to increase the atmosphere dew point in the furnace nose, and a thin oxide film is formed on the zinc liquid surface due to the high dew point, so that the evaporation of the zinc liquid is inhibited, and the generation amount of zinc vapor is reduced. Although this method can reduce the evaporation of the zinc liquid, it cannot prevent the formation of zinc vapor. The evaporated zinc vapor is more easily adhered to the inner wall of the furnace nose under the high dew point state to form a thick zinc ash layer, and the furnace nose is required to be stopped and cleaned after reaching a certain degree. In addition, for some special steel grades, the high dew point in the furnace nose can cause the surface of the strip steel to be oxidized, and the existence of the surface oxide layer of the strip steel can also cause galvanized surface defects.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model provides a hot-dip auxiliary device which can improve the cleanliness, reduce the zinc ash concentration and improve the hot-dip surface quality, and the utility model discloses a lifting device for the atmosphere cleanliness in the furnace nose.
The utility model discloses a following technical scheme reaches the invention purpose:
a device for improving the cleanliness of atmosphere in a furnace nose comprises the furnace nose, a zinc pot, a hot tensioning roller chamber, an upper steering roller and a lower steering roller, wherein the hot tensioning roller chamber is arranged in an annealing furnace, the upper steering roller is arranged in the hot tensioning roller chamber, the zinc pot is arranged below the hot tensioning roller chamber, zinc liquid is contained in the zinc pot, the lower steering roller is arranged in the zinc pot, the top end of the furnace nose is connected with the hot tensioning roller chamber, the bottom end of the furnace nose is arranged in the zinc pot and is inserted under the liquid level of the zinc liquid,
the method is characterized in that: also comprises an air return pipe, an exhaust pipe, a gas cooler, a secondary filter, an air exhaust fan, a gas transmission branch pipe and a nitrogen pipe,
the gas cooler is connected with a secondary filter through a gas pipe, the secondary filter is connected with the gas return pipe through a gas transmission branch pipe which is connected with an air exhaust fan in series, the air exhaust fan provides power for air exhaust, a first valve and a second valve are connected on the gas return pipe in series in sequence, the first valve and the second valve are respectively arranged on two sides of the gas transmission branch pipe and a gas return pipe connecting point, a nitrogen source is connected with the gas return pipe through a nitrogen pipe which is connected with a third valve in series, the second valve is arranged between the gas transmission branch pipe and the gas return pipe connecting point and the nitrogen pipe and the gas return pipe connecting point, an electric heater is further arranged on the gas return pipe and is arranged between the nitrogen pipe and the gas return pipe connecting point and the furnace nose.
The lifting device for the cleanliness of the atmosphere in the furnace nose is characterized in that: the cooler adopts air indirect cooling or water cooling, and the height H of the return pipe from the liquid level of the zinc liquid in the furnace nose is selected1The height H of the exhaust pipe from the zinc liquid level in the furnace nose is 0.5-4 m20.2 m-2.5 m, and the range of the air exhaust volume of the air exhaust fan is 50m3/hour～400m3The second-stage filter adopts a high-precision mesh filter with the filtering precision of 5-100 mu m.
The use method of the device for improving the cleanliness of the atmosphere in the furnace nose is characterized by comprising the following steps: the method is implemented in sequence according to the following steps:
hot-dip: the strip steel enters a furnace nose through an upper steering roller in a hot tensioning roller chamber, then enters a zinc pot through the furnace nose, completes hot galvanizing in the zinc pot, and leaves the zinc pot after being steered through a lower steering roller in the zinc pot;
the first-stage filtration: after high-temperature gas containing zinc vapor in the furnace nose is pumped out through the exhaust pipe, the gas is cooled to 50-200 ℃ through the cooler, the zinc vapor is condensed into zinc ash particles in the cooling process, and most of the zinc ash particles fall into the cooler under the action of gravity, so that the first-stage filtration and collection of the zinc vapor are realized;
third, secondary filtering: the gas after the first-stage filtration becomes clean gas after being filtered by a second-stage filter, the gas after the second-stage filtration is treated by direct discharge or recycling,
when the direct discharge treatment mode is selected, the first valve and the third valve are opened, the second valve is closed, the gas after the secondary filtration is discharged into the external atmosphere through the gas transmission branch pipe and the gas return pipe, the nitrogen in the nitrogen source is heated to 400-500 ℃ through the nitrogen pipe and the gas return pipe and the electric heater (11) and then is additionally input into the furnace nose,
when the recycling treatment mode is selected, the first valve and the third valve are closed, the second valve is opened, the gas after the secondary filtration passes through the gas transmission branch pipe and the gas return pipe and is heated to 400-500 ℃ by the electric heater and then is supplemented to be input into the furnace nose, the recycling of the filtered gas is realized, the consumption of nitrogen is reduced,
the electric heater is used for ensuring that the interior of the furnace nose is always in a high-temperature environment, and the zinc vapor is prevented from being condensed in the furnace nose.
The utility model discloses broken through the control method of traditional zinc ash concentration in the furnace nose, reduced zinc ash concentration in the furnace nose by a wide margin through gaseous in the continuous replacement furnace nose to improve the cleanliness in the furnace nose.
The utility model discloses following beneficial effect has: the cleanliness in the hot galvanizing furnace nose is obviously improved and maintained for a long time, the zinc ash concentration in the furnace nose is reduced, the surface quality defect of the hot galvanizing of the strip steel is greatly reduced, the surface quality of the galvanized sheet is improved, the period of stopping the machine set to clean the furnace nose is prolonged, and therefore the operation rate of the machine set is improved.
Drawings
FIG. 1 is a schematic flow diagram of a prior art hot dip galvanizing process,
fig. 2 is a schematic structural diagram of the present invention.
Detailed Description
The invention is further illustrated by the following specific examples.
Example 1
A device for improving the cleanliness of the atmosphere in a furnace nose comprises the furnace nose 1, a zinc pot 2, a hot tensioning roller chamber 3, an upper steering roller 41, a lower steering roller 42, an air return pipe 61, an exhaust pipe 62, a gas cooler 7, a secondary filter 8, an air exhaust fan 9, a gas transmission branch pipe 63 and a nitrogen pipe 64, and as shown in figure 2, the device has the following specific structure:
the hot tensioning roller chamber 3 is arranged in the annealing furnace, an upper steering roller 41 is arranged in the hot tensioning roller chamber 3, the zinc pot 2 is arranged below the hot tensioning roller chamber 3, zinc liquid 21 is contained in the zinc pot 2, a lower steering roller 42 is arranged in the zinc pot 2, the top end of the furnace nose 1 is connected with the hot tensioning roller chamber 3, and the bottom end of the furnace nose 1 is arranged in the zinc pot 2 and inserted below the liquid level of the zinc liquid 21;
an air return pipe 61 and an exhaust pipe 62 are sequentially arranged from top to bottom below the furnace nose 1, the other end of the exhaust pipe 6 is connected with an air cooler 7, the air cooler 7 is connected with a secondary filter 8 through an air conveying pipe, the secondary filter 8 is connected with an air return pipe 61 through an air conveying branch pipe 63 connected with an air suction fan 9 in series, the air suction fan 9 provides power for air suction, a first valve 611 and a second valve 612 are sequentially connected with the air return pipe 61 in series, the first valve 611 and the second valve 612 are respectively arranged on two sides of a connecting point of the air conveying branch pipe 63 and the air return pipe 61, a nitrogen source 10 is connected with the air return pipe 61 through a nitrogen pipe 64 connected with a third valve 613 in series, the second valve 612 is arranged between the connecting point of the air conveying branch pipe 63 and the air return pipe 61 and a connecting point of the nitrogen pipe 64 and the air return pipe 61, an electric heater 11 is further arranged on the air return pipe.
In this embodiment: the cooler adopts air indirect cooling or water cooling, and the height H of the air return pipe 61 from the liquid level of the zinc liquid in the furnace nose 11The height H of the exhaust pipe 62 from the zinc liquid level in the furnace nose 1 is 0.5-4 m2The range of the air suction quantity of the air suction fan 9 is between 0.2 and 2.5 meters3/hour～400m3The second-stage filter 8 adopts a high-precision mesh filter with the filtering precision of 5-100 mu m.
When the method is used, the steps are implemented in sequence as follows:
hot-dip: the strip steel 5 enters the furnace nose 1 through the upper steering roller 41 in the hot tensioning roller chamber 3, then enters the zinc pot 2 through the furnace nose 1, hot galvanizing is completed in the zinc pot 2, the strip steel leaves the zinc pot 2 after being steered through the lower steering roller 42 in the zinc pot 2, and the running track of the strip steel 5 is shown as arrows a, b and c in the figure 2;
the first-stage filtration: after high-temperature gas containing zinc vapor in the furnace nose 1 is extracted through the exhaust pipe 62, the gas is cooled to 50-200 ℃ through the cooler 7, in the cooling process, the zinc vapor is condensed into zinc ash particles, and most of the zinc ash particles fall into the cooler 7 under the action of gravity, so that the first-stage filtration and collection of the zinc vapor are realized;
third, secondary filtering: the gas after the first-stage filtration becomes clean gas after being filtered by the second-stage filter 8, the gas after the second-stage filtration is treated by direct discharge or recycling,
when the direct discharge treatment mode is selected, the first valve 611 and the third valve 613 are opened, the second valve 612 is closed, the gas after the secondary filtration is discharged into the external atmosphere through the gas transmission branch pipe 63 and the gas return pipe 61, the nitrogen in the nitrogen source 10 is heated to 400-500 ℃ through the nitrogen pipe 64 and the gas return pipe 61 and the electric heater 11 and then is additionally input into the furnace nose 1,
when the recycling treatment mode is selected, the first valve 611 and the third valve 613 are closed, the second valve 612 is opened, the gas after the secondary filtration passes through the gas transmission branch pipe 63 and the gas return pipe 61 and is heated to 400-500 ℃ by the electric heater 11, and then is additionally input into the furnace nose 1, so that the recycling of the filtered gas is realized, the consumption of nitrogen is reduced,
the electric heater 11 is used for ensuring that the interior of the furnace nose 1 is always in a high-temperature environment, and zinc vapor is prevented from being condensed in the furnace nose 1.
Claims (2)
1. A lifting device for the cleanliness of atmosphere in a furnace nose comprises the furnace nose (1), a zinc pot (2), a hot tensioning roller chamber (3), an upper steering roller (41) and a lower steering roller (42), wherein the hot tensioning roller chamber (3) is arranged in an annealing furnace, the upper steering roller (41) is arranged in the hot tensioning roller chamber (3), the zinc pot (2) is arranged below the hot tensioning roller chamber (3), zinc liquid (21) is contained in the zinc pot (2), the lower steering roller (42) is arranged in the zinc pot (2), the top end of the furnace nose (1) is connected with the hot tensioning roller chamber (3), the bottom end of the furnace nose (1) is arranged in the zinc pot (2) and inserted under the liquid level of the zinc liquid (21),
the method is characterized in that: also comprises an air return pipe (61), an exhaust pipe (62), a gas cooler (7), a secondary filter (8), an air exhaust fan (9), a gas transmission branch pipe (63) and a nitrogen pipe (64),
a gas return pipe (61) and an exhaust pipe (62) are sequentially arranged from top to bottom below the furnace nose (1), the other end of the exhaust pipe (62) is connected with a gas cooler (7), the gas cooler (7) is connected with a secondary filter (8) through a gas transmission branch pipe (63) which is connected with an air exhaust fan (9) in series, the secondary filter (8) is connected with the gas return pipe (61) through a gas transmission branch pipe (63) which is connected with the air exhaust fan (9) in series, a first valve (611) and a second valve (612) are sequentially connected with the gas return pipe (61) in series, the first valve (611) and the second valve (612) are respectively arranged at two sides of a connection point of the gas transmission branch pipe (63) and the gas return pipe (61), a nitrogen source (10) is connected with the gas return pipe (61) through a nitrogen pipe (64) which is connected with a third valve (613) in series, the second valve (612) is arranged between a connection point, the air return pipe (61) is also provided with an electric heater (11), and the electric heater (11) is arranged between the connecting point of the nitrogen pipe (64) and the air return pipe (61) and the furnace nose (1).
2. The apparatus for improving the cleanliness of the atmosphere in the furnace nose according to claim 1, wherein: the cooler adopts air indirect cooling or water cooling, the height H1 of the return air pipe (61) from the liquid level of the zinc liquid in the furnace nose (1) is 0.5 m-4 m, the height H2 of the exhaust pipe (62) from the liquid level of the zinc liquid in the furnace nose (1) is 0.2 m-2.5 m, and the range of the air exhaust volume of the air exhaust fan (9) is 50m3/hour～400m3The second-stage filter (8) adopts a high-precision mesh filter with the filtering precision of 5-100 mu m.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020916359.4U CN212688161U (en) | 2020-05-27 | 2020-05-27 | Lifting device for atmosphere cleanliness in furnace nose |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020916359.4U CN212688161U (en) | 2020-05-27 | 2020-05-27 | Lifting device for atmosphere cleanliness in furnace nose |
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| CN212688161U true CN212688161U (en) | 2021-03-12 |
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| CN202020916359.4U Active CN212688161U (en) | 2020-05-27 | 2020-05-27 | Lifting device for atmosphere cleanliness in furnace nose |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111500961A (en) * | 2020-05-27 | 2020-08-07 | 宝钢工程技术集团有限公司 | Device for improving cleanliness of atmosphere in furnace nose and using method thereof |
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2020
- 2020-05-27 CN CN202020916359.4U patent/CN212688161U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111500961A (en) * | 2020-05-27 | 2020-08-07 | 宝钢工程技术集团有限公司 | Device for improving cleanliness of atmosphere in furnace nose and using method thereof |
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