JP3906423B2 - Hot dip galvanizing furnace - Google Patents

Description

  The present invention relates to a galvanizing furnace in which a plating tank is installed inside a hot dip galvanizing furnace, a combustion chamber surrounding the side of the plating tank is formed, and the plating tank is heated by a combustion gas swirling in the combustion chamber in one direction. About.

  The hot dip galvanizing furnace is one in which a hot dip galvanizing object is immersed in hot dip zinc stored in a plating tank and subjected to a plating process, and the following hot dip galvanizing furnaces are known.

  A hot-dip galvanizing bath with a double wall structure consisting of an inner wall and an outer wall, the inner wall is heated by a burner attached to the outer wall at a distance, and thereby the zinc stored in the plating tank inside the inner wall is stored. A hot dip galvanizing furnace that maintains a molten state has been proposed. Furthermore, a hot dip galvanizing furnace has also been proposed in which a throwing heater is inserted into the hot dip zinc inside the portion of the inner wall facing the middle of the burner (see, for example, Patent Document 1).

  In addition, a plating bath is installed inside the hot dip galvanizing furnace, a combustion chamber is formed surrounding the side of the plating bath, and one burner is provided near one end of the short wall on both sides of the hot dip galvanizing furnace. There has been proposed a hot dip galvanizing furnace that heats a plating tank with a combustion gas swirling in one direction in a combustion chamber (see, for example, Patent Document 2).

  Further, a plating tank is installed inside the hot dip galvanizing furnace to form a combustion chamber surrounding the side of the plating tank. The combustion chamber is formed by a partition member 27 provided at the center of the long wall portion 1 as shown in FIG. There has been proposed a hot dip galvanizing furnace that is divided into two on the left and right sides of the figure, each of which has a separate combustion chamber 5 symmetrically, and two burners 26 are provided on both short wall portions 2 (for example, , See Patent Document 2).

  Further, unlike the partition wall portion provided in the central portion of the long wall portion, the partition wall is divided so as to divide the combustion chamber in the vertical direction in order to form individual combustion chambers corresponding to the burners arranged in the vertical direction. A hot dip galvanizing furnace configured by providing a portion has been proposed (see, for example, Patent Document 3).

Japanese Utility Model Publication No. 56-28064 Japanese Utility Model Publication No. 58-97160 JP 2001-164351 A

  However, in a hot-dip galvanizing bath having a double-walled hot dip galvanizing bath composed of an inner wall and an outer wall, the inner wall is heated only by a burner attached to the outer wall at an interval, the temperature inside the inner wall is adjacent. There was a problem that the amount dropped in the middle of the matching burner and the adhesion amount of zinc decreased at this low temperature position. Furthermore, this plating tank heating method has a problem that the temperature in the furnace is increased, the life of the plating tank is shortened, and the number of burners is increased. It was.

  In addition, even in the case of a hot dip galvanizing furnace in which a throwing heater is inserted into molten zinc inside the portion of the inner wall facing the middle of the burner, a large number of throwing heaters are required because of the large number of burners, There was a problem of cost.

  In addition, a plating bath is installed inside the hot dip galvanizing furnace, a combustion chamber is formed surrounding the side of the plating bath, and one burner is provided near one end of the short wall on both sides of the hot dip galvanizing furnace. In a hot dip galvanizing furnace that heats the plating tank with the combustion gas swirling in one direction in the combustion chamber, the temperature is lower at a position farther from the burner in the swirling direction of the combustion gas, and the temperature distribution in the longitudinal direction of the plating tank There was a problem that was large. This tendency became remarkable as the size of the plating tank increased in the longitudinal direction.

  In a large-sized plating tank large in the longitudinal direction, as shown in FIG. 6, the combustion chamber 5 is divided into two on the left and right sides of the drawing by a partition wall member 27 provided at the center portion of the long wall portion 1, and two in each short wall portion 2. A hot dip galvanizing furnace configured by providing each burner 26 is used, and the partition member 27 used to divide the combustion chamber 5 into two on the left and right in the figure also has a function of suppressing expansion of the plating tank 3 due to heat, Generally made of refractory bricks. As shown in FIGS. 6 and 7, the partition member 27 that supports the plating tank 3 blocks the combustion gas passing through the combustion chamber 5, so that the plating tank 3 is large in the longitudinal direction and has a large size. Then, the method of heating a plating tank with the combustion gas swirling in one direction could not be used. Furthermore, since the partition wall member 27 that supports the plating tank 3 supports both side surfaces on the long side of the plating tank 3 with respect to the furnace wall, it is necessary to make the furnace case 8 stronger.

  Moreover, in the hot dip galvanizing furnace provided with the partition wall so as to divide the combustion chamber into two in the vertical direction in order to form individual combustion chambers corresponding to the burners arranged in parallel in the vertical direction, Since the area in contact with the tank is large, there is a problem that heat is not easily transmitted to the plating tank. Further, the partition wall is generally made of refractory bricks, but it was torn down when the plating tank was replaced, and the partition wall had to be rebuilt after the plating tank was replaced.

  In order to advantageously solve the above-described problem, the hot dip galvanizing furnace of the present invention is provided with a plating tank 3 in the hot dip galvanizing furnace, and a combustion chamber 5 surrounding the side of the plating tank 3 is formed and burned. In the hot dip galvanizing furnace in which the plating tank 3 is heated by the combustion gas swirling in one direction in the room, the vicinity of one end portion of one short wall portion 2 of the hot dip galvanizing furnace and the vicinity of one end portion of the short wall portion 2 High-speed burners 6 a and 6 b are provided in the opposite direction near one end of the other short wall portion 2 located at the corner, and the high-speed is obtained by bending the vicinity of the nozzle tip at the intermediate position of the combustion chamber 5 in the longitudinal direction of the plating tank 3. Burners 7a and 7b are installed.

The nozzles 15 of the burners 7a and 7b bent near the tip of the nozzle are bent in the range of more than 0 ° and not more than 90 ° , preferably 45 ° with respect to the central axis of the tube constituting the burner. In order to cool the nozzle 15, cooling air is sent between a small outer diameter pipe 16 through which combustion gas passes and a large outer diameter pipe 17 in order to cool the nozzle 15. .

Moreover, the hot dip galvanizing furnace which installs the plating tank 3 inside the hot dip galvanizing furnace, forms the combustion chamber 5 surrounding the side of the plating tank 3, and heats the plating tank 3 with the combustion gas swirling in the combustion chamber in one direction. In the plating furnace, in the opposite direction, near one end portion of one short wall portion 2 of the hot dip galvanizing furnace, and near one end portion of the other short wall portion 2 that is diagonally opposite to one end portion of the short wall portion 2. Are provided with high-speed burners 6a and 6b, and high- speed burners 7a and 7b in which the vicinity of the tip of the nozzle is bent at the intermediate position of the combustion chamber 5 in the longitudinal direction of the plating tank 3, and the furnace is provided outside the hot dip galvanizing furnace. A steel tubular fixing portion 19 fixed to a force receiving member 18 provided at a distance from the wall, a fixing portion 19 and a hexagon bolt 20 are joined together, and a furnace case 8 and a heat insulating material 9 of the furnace case are configured. Through one end of the furnace wall Consists of steel tubular support portion 21 which is disposed so as to be in contact with the side peripheral surface of the feeder tank 3, the plating tank holding apparatus and heat insulating material 24 a portion in contact with the side peripheral surface of the plating tank 3 the support 21, Both side surfaces on the long side of the plating tank 3 are supported by force receiving members 18.

  According to the hot dip galvanizing furnace of the present invention, a plating tank is installed inside the hot dip galvanizing furnace, a combustion chamber surrounding the side of the plating tank is formed, and one end portion of the short wall portion on both sides of the hot dip galvanizing furnace In the hot dip galvanizing furnace, in which a burner is installed in the vicinity and the plating tank is heated by the combustion gas swirling in one direction in the combustion chamber, the vicinity of the nozzle tip is bent to the middle position of the combustion chamber in the longitudinal direction of the plating tank By providing a high-speed burner, the plating tank can be heated so that the temperature distribution of zinc is uniform even in a large galvanizing furnace large in the longitudinal direction. Moreover, since it is a convection heat transfer heating with respect to a plating tank, the temperature in a furnace becomes low and the lifetime of a plating tank becomes long.

Furthermore, according to the hot dip galvanizing furnace of the present invention, by using a plating tank holding device as a member for holding the expansion of the plating tank, the combustion gas passing through the combustion chamber is not blocked, The method of heating the plating tank with the combustion gas swirling in one direction can be used in a large galvanizing furnace having a large longitudinal direction. In addition, since the area where the plating tank holding device and the side peripheral surface of the plating tank are in contact with each other is small, heat can be uniformly transmitted to the plating tank, and the plating tank can be easily removed and attached when the plating tank is replaced.

BEST MODE FOR CARRYING OUT THE INVENTION

FIG. 1 is a horizontal sectional view of a hot dip galvanizing furnace according to an embodiment of the present invention. The hot dip galvanizing furnace includes a plating tank 3 for storing hot dip zinc 4 installed in the furnace wall of the hot dip galvanizing furnace formed in a rectangular shape by the long wall portion 1 and the short wall portion 2, and a hot dip galvanizing furnace. Combustion chamber 5 surrounding the side of the plating tank 3 by the inner peripheral surface and the outer peripheral surface of the plating tank 3, the vicinity of one end of one short wall 2 of the furnace wall, and the vicinity of one end of the short wall 2 And a high-speed burner 6a, 6b installed in the opposite direction near one end of the other short wall 2 that is diagonally opposite to the tip of the nozzle in the middle position of the combustion chamber 5 in the longitudinal direction of the plating tank 3 Bent high-speed burners 7a and 7b are provided. As an embodiment of the present invention, the present invention will be described by giving a case where the vicinity of the tip of the high-speed burners 7a, 7b bent near the tip of the nozzle is bent 45 ° with respect to the central axis of the tube constituting the burner .

  The plating tank 3 for storing the molten zinc 4 installed inside the furnace wall composed of the furnace body case 8 and the heat insulating material 9 of the furnace body case is elongated, and both ends in the longitudinal direction are arcuate. Is formed.

  The high-speed burners 6 a and 6 b installed in the short wall portion 2 have a combustion air supply port 11 and a combustion gas supply port 10, and the combustion gas obtained by burning the supplied combustion gas is supplied to the combustion chamber 5. It is installed with the flame front facing the combustion chamber so as to jet out in the longitudinal direction. The high-speed burners 7a and 7b in which the vicinity of the tip of the nozzle is bent by 45 ° are installed with an inclination of 45 ° with respect to the long wall portion 1, as shown in FIG.

  The combustion gas produced by the high-speed burner 6a installed on one short wall portion 2 passes through one longitudinal combustion chamber 5 and is bent at 45 ° around the nozzle tip at an intermediate position in the longitudinal direction of the combustion chamber 5. After mixing with the combustion gas of 7a, it moves to the combustion chamber 5 of the other longitudinal direction, mixes with the combustion gas of the high-speed burner 6b provided in the short wall part 2, passes through the combustion chamber 5 of the longitudinal direction, and a combustion chamber 5 is mixed with the combustion gas of the high-speed burner 7b bent around 45 ° at the vicinity of the tip of the nozzle at an intermediate position in the longitudinal direction, and swirled in one direction in the combustion chamber to heat the plating tank 3.

  A plurality of high-speed burners 6a and 6b installed on the short wall portion 2 and a plurality of high-speed burners 7a and 7b bent near the tip of the nozzle by 45 ° in the vertical direction of the combustion chamber 5 depending on the scale of the hot dip galvanizing furnace. It does not matter if it is installed side by side.

FIG. 2 is a plan view of a high-speed burner in which the vicinity of the tip of the nozzle is bent by 45 °. As shown in FIG. 2, the high-speed burners 7 a and 7 b in which the vicinity of the nozzle tip is bent by 45 ° have a combustion air supply port 13, a combustion gas supply port 12, and a cooling air supply port 14. Is bent 45 ° with respect to the central axis of the tube constituting the burner . The combustion gas obtained by combusting the supplied combustion gas strikes the bent portion of the nozzle 15, changes its direction, and is discharged from the nozzle tip.

  FIG. 3 is a cross-sectional view taken along the line AA of FIG. Since the nozzle portions of the high-speed burners 7a and 7b bent at 45 ° around the nozzle tip are always in the combustion gas, the nozzle 15 is composed of a heat-resistant steel pipe member having a different outer diameter, for example, a stainless steel pipe. Cooling air is sent between the pipe 16 having a small outer diameter through which the combustion gas passes and the pipe 17 having a large outer diameter to cool the nozzle.

  FIG. 4 is a horizontal sectional view of a hot dip galvanizing furnace provided with a plating tank presser, and FIG. 5 is a sectional view taken along line BB of FIG. The plating tank holder is fixed to a force receiving member 18 provided at a distance from the furnace wall outside the hot dip galvanizing furnace, and is joined by a fixing part 19 and a hexagonal bolt 20 to form a furnace case. 8 and a heat insulating material 9 of the furnace body case, and a support portion 21 that is installed so that one end thereof is in contact with the side peripheral surface of the plating tank 3. Both side walls on the side are supported by force receiving members 18.

  The force receiving member 18 provided outside the hot dip galvanizing furnace at a distance from the furnace wall is fixed to the base 22 with an anchor bolt at the lower end and is fixed to the support member 23 of the force receiving member. . The fixing portion 19 of the plating tank pressing device has one end portion fixed to the force receiving member 18 by bolt joining, and the other end portion joined to the support portion 21 and the hexagon bolt 20. In order to prevent the support portion 21 from being heated to a high temperature by the combustion gas and being locally heated to the plating tank 3 by the support portion 21, the end portion of the support portion 21 installed so as to be in contact with the side peripheral surface of the plating bath A portion of the support portion 21 that is in contact with the peripheral surface of the plating tank is composed of a heat insulating material 24.

  The fixing portion 19 of the plating tank holding device is formed of a steel pipe member such as a carbon steel pipe for piping or a carbon steel pipe for general structure, and the support portion 21 is always in the combustion gas. It is formed by a stainless steel pipe. The steel pipe diameter of the support portion 21 is smaller than the steel pipe diameter of the fixed portion 19, and the support portion 21 and the fixed portion 19 are joined by inserting a part of the support portion 21 into the steel pipe of the fixed portion 19. The length of the plating tank holding device is adjusted and the hexagon bolt 20 is used for joining. Further, the level of the support portion 21 can be adjusted by the hexagon bolt 20.

  In addition, although the plating tank holding device is written in a state where two are attached in the vertical direction in FIG. 5, depending on the depth of the plating tank 3 as long as the height is different from the height of the mounting position 25 of the high-speed burner. You can change the number of installations. Also, in the middle and small hot dip galvanizing furnaces in which high-speed burners 7a and 7b bent around the nozzle tip as shown in FIG. It is possible to use.

  Horizontal sectional view of hot dip galvanizing furnace   Top view of a high-speed burner bent near the nozzle tip   AA sectional view of FIG.   Horizontal section of hot dip galvanizing furnace with plating tank presser   BB sectional view of FIG.   Horizontal section of conventional hot dip galvanizing furnace   CC sectional view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Long wall part 2 Short wall part 3 Plating tank 4 Molten zinc 5 Combustion chamber 6a High-speed burner 6b High-speed burner 7a High-speed burner bent near the nozzle tip 7b High-speed burner bent near the nozzle tip 8 Furnace case 9 Heat insulation of the furnace case Material 10 Combustion gas supply port 11 Combustion air supply port 12 Combustion gas supply port 13 Combustion air supply port 14 Cooling air supply port 15 Nozzle 16 Small outer diameter tube 17 Large outer diameter tube 18 Force receiving member 19 Fixing part 20 Hexagon bolt 21 Support part 22 Foundation 23 Support member of force receiving member 24 Heat insulating material 25 Burner mounting position 26 Burner 27 Bulkhead member

Claims (3)

  A galvanizing furnace in which a plating tank 3 is installed inside a hot dip galvanizing furnace, a combustion chamber 5 surrounding the side of the plating tank 3 is formed, and the plating tank 3 is heated by a combustion gas swirling in the combustion chamber in one direction. , In the opposite direction, near one end portion of one short wall portion 2 of the hot dip galvanizing furnace and near one end portion of the other short wall portion 2 that is diagonally opposite to one end portion of the short wall portion 2. A hot dip galvanizing furnace characterized in that burners 6 a and 6 b are provided, and high-speed burners 7 a and 7 b are provided at the intermediate positions of the combustion chamber 5 in the longitudinal direction of the plating tank 3 and bent near the tip of the nozzle. The nozzle 15 of the high-speed burners 7a and 7b bent near the tip of the nozzle according to claim 1 is bent in the range of more than 0 ° and not more than 90 ° with respect to the central axis of the tube constituting the burner. The cooling air is sent between a pipe 16 having a small outer diameter through which combustion gas passes and a pipe 17 having a large outer diameter, which are constituted by two pipes having different diameters. A high-speed burner that bends the tip of a nozzle used in a hot dip galvanizing furnace. A galvanizing furnace in which a plating tank 3 is installed inside a hot dip galvanizing furnace, a combustion chamber 5 surrounding the side of the plating tank 3 is formed, and the plating tank 3 is heated by a combustion gas swirling in the combustion chamber in one direction. , In the opposite direction, near one end portion of one short wall portion 2 of the hot dip galvanizing furnace and near one end portion of the other short wall portion 2 that is diagonally opposite to one end portion of the short wall portion 2. Burners 6a and 6b are provided, and high-speed burners 7a and 7b in which the vicinity of the tip of the nozzle is bent are provided at intermediate positions of the combustion chamber 5 in the longitudinal direction of the plating tank 3,
A steel tubular fixing portion 19 fixed to a force receiving member 18 provided at a distance from the furnace wall outside the hot dip galvanizing furnace, and the fixing portion 19 and a hexagon bolt 20 are joined together, and the furnace case 8 and the furnace It comprises a steel tubular support portion 21 that is installed so that one end portion thereof is in contact with the side peripheral surface of the plating tank 3 through the furnace wall constituted by the heat insulating material 9 of the body case. A hot dip galvanizing furnace characterized in that both side surfaces on the long side of the plating tank 3 are supported by force receiving members 18 by means of a plating tank pressing device in which a portion in contact with the side peripheral surface of the tank 3 is a heat insulating material 24 .

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