JP5256699B2 - Method and apparatus for removing deposits in flue duct of vacuum degassing apparatus - Google Patents

Description

  The present invention relates to a method and an apparatus for mechanically removing bullion and soot adhering in a flue duct connecting a vacuum tank of a vacuum degassing apparatus and a dust separator.

  In the RH type vacuum degassing apparatus, two dip tubes attached to a vacuum chamber are immersed in molten steel in a ladle, and the molten steel is sucked into a vacuum chamber in a vacuum state to perform degassing treatment.

  The exhaust gas from the vacuum chamber contains dust and metal, and the exhaust duct connecting the vacuum chamber and the exhaust system, and depositing and depositing in the exhaust system, reducing the exhaust efficiency. Various proposals have been made.

  Patent Document 1 describes a dismantling apparatus that can remove bullion and slag adhering to a refractory in an upper tank of a vacuum degassing facility, or can destroy the refractory.

  Patent Document 2 describes a vacuum chamber that can reduce the adhesion of metal to the inner wall of the exhaust pipe and prevent wear of the refractory due to radiant heat from the inner wall of the tank body.

  Patent Document 3 describes a bare metal melting apparatus for a vacuum degassing tank that can be quickly and surely attached to and detached from the vacuum tank, and the same nozzle and rod can be used repeatedly.

  Patent Document 4 describes a vacuum refining device that prevents clogging by dust trapped in a vacuum exhaust duct, maintains the ultimate degree of vacuum in the vacuum chamber at a predetermined level, and facilitates dust removal work. ing.

  Patent Document 5 describes a structure for reducing the size of an exhaust device of a degassing facility and efficiently removing dust accumulated in the exhaust duct.

  In Patent Document 6, when the inside of the vacuum degassing tank after the vacuum degassing treatment is returned to the atmospheric pressure, an inert gas is blown into the tank through a nozzle provided in an exhaust duct between the exhaust port of the degassing device and the gas cooler. In addition, it is described that dust or the like adhering to the duct is discharged into the tank simultaneously with the return pressure.

  Also, when a dust separator is placed between the vacuum chamber and the exhaust device, dust and metal are attached to the flue gas flue that connects the dust separator and the vacuum chamber, so a method of removing using a special device called the dragger method And removal by human power.

  FIG. 4 is a diagram for explaining the case where dust and metal attached to the exhaust gas flue 6 are removed by a dedicated device used for the dragger method. The dedicated device 10 is moved on the deck 8 near the dust separator 4. The rail 9 is laid.

The dedicated device 10 has an excavator 11 at the tip of the boom. During the removal work, a part of the main exhaust duct 41 connecting the dust separator 4 and the exhaust gas device is opened, and the dedicated device 10 is connected to the boom. The excavator 11 attached to the tip is moved on the rail 9 so as to reach the exhaust gas flue 6.
JP 2005-146356 A JP 2004-68060 A JP 2001-192725 A Japanese Patent Laid-Open No. 10-152721 Japanese Patent Laid-Open No. 10-1715 Japanese Patent Laid-Open No. 06-220522

  However, the dragger-type dedicated device is expensive and requires a large installation space. On the other hand, the removal work of dust and bullion attached to the flue gas flue by workers is a heavy labor, and the work efficiency is low and the work is long. .

The object of the present invention can be achieved by the following means.
1. A method for removing deposits in a flue duct of a vacuum degassing apparatus, wherein a deck is provided around a manhole of a dust separator, and a forklift mounted with a dedicated tool for dust removal on a fork is run on the deck. The dust removing jig is inserted into a flue duct connecting the dust separator and a vacuum tank of a vacuum degassing device, and dust, metal or the like attached to the flue duct is removed. A method for removing deposits in a flue duct of a vacuum degasser.
2. An apparatus for removing deposits in a flue duct of a vacuum degassing apparatus, comprising a deck provided around a manhole of a dust separator, and a forklift mounted on the deck, the forklift having a dedicated jig for removing dust on the fork When the forklift is operated, the deck has a dedicated dust removal jig attached to the fork of the forklift, and the flue duct connecting the dust separator and the vacuum tank of the vacuum degassing device from the manhole. An apparatus for removing deposits in a flue duct of a vacuum degassing apparatus, wherein the apparatus has a width and height capable of removing dust and metal attached to the flue duct.

  ADVANTAGE OF THE INVENTION According to this invention, the dust and bullion which adhered to the exhaust gas flue can be removed in a short time, and it is very useful industrially.

  The present invention is characterized in that the deposits in the flue duct of the vacuum degassing apparatus are removed by using a general-purpose forklift instead of a dedicated apparatus such as a dragger system.

  1 is a side view schematically illustrating a method for removing deposits in a flue duct of a vacuum degassing apparatus according to an embodiment of the present invention, and FIG. 2 is a plan view. Is a forklift, 2 is a fork, 3 is a special tool for dust removal, 4 is a dust separator, 5 is a vacuum tank of a vacuum degassing device, 6 is a flue duct, 7 is a stopper, 8 is a deck, 41 is a manhole, 42 is A manhole cover is shown. The diameter of the manhole 41 may be delivered to the bottom and side surfaces of the flue duct where dust adheres easily in the flue duct, but is preferably larger than the diameter of the flue duct 6.

  In the method for removing deposits in the flue duct according to the present invention, the deck 8 is provided so as to cover a predetermined horizontal region around the manhole 41 opened to the tube body of the dust separator 4, and the forklift 1 is caused to travel thereon. .

  A dust removing jig 3 is attached to the fork 2 of the forklift 1, and the position of the forklift 1 is changed on the deck 8, or the fork 2 is moved up and down and the flue such as dust and bullion is moved by the dust removing jig 3. The deposits in the duct are removed (arrows a and b).

  FIG. 3 shows an example of the dust removal dedicated jig 3. (A) is a top view, (b) shows a front view with an AA ′ cross-sectional view in the plan view. The rails 31 and 32 whose tips are processed at an acute angle are attached to the fork 2 in parallel.

  The forklift 1 can only approach the outside of the manhole cover 42 attached to the outside of the manhole 41 because of the lifting mechanism of the fork 2.

  Therefore, the length l of the rails 31 and 32 including the fork 2 is sufficient to remove deposits such as dust and metal through the flue duct 6 even in such a case. Length.

  Since the length of the flue duct is different between the single tank type and the two tank type vacuum degassing apparatus, the length l is set to an appropriate length.

  Therefore, the deck 8 is assumed to have a size and shape sufficient for the forklift 1 to move so that the tip of the dedicated dust removal jig 3 can be freely changed in position inside the flue duct 6. A handrail (not shown) and a stopper 7 are installed around the deck 8 so that the forklift 1 does not fall. Further, an elevating staircase 81 for the driver of the forklift 1 is provided.

  The deck 8 sets the horizontal plane with respect to the manhole 41 so that the fork 2 to which the dust removing jig 3 is attached can move freely up to the upper and lower limits of the opening in the manhole 41.

  When the height of the horizontal surface of the deck 8 is lower than the manhole 41, even if the fork 2 is raised to the upper limit on the performance of the forklift 1, it does not reach the upper end of the manhole 41 and the deposits in the flue duct are removed. I can't do it enough.

  The forklift 1 used in the present invention may be an existing one and requires no particular modification. If there is no duct deposit removal work, it can be diverted to other work, so it is economical and can be implemented easily.

  After the duct deposit removal work is completed, the forklift 1 can be lowered from the deck 8 and the deck 8 can be used for other work, and space efficiency is high.

  In addition, the present invention provides a deposit 8 in a flue duct 6 of a vacuum degassing apparatus including a deck 8 that covers a predetermined area of a horizontal surface around a manhole 41 of a dust separator 4 and a forklift 1 that moves freely on the deck 8. It is a removal device.

  In the above apparatus, the forklift 1 has a dedicated dust removing jig 3 on the fork 2, and the deck 8 removes the dust removing dedicated jig 3 attached to the fork 2 of the forklift 1 from the manhole 41 and the vacuum separator 4. It is inserted into the flue duct 6 that connects the vacuum chambers of the gas apparatus, and has a width and height that can remove dust, metal, etc. attached to the flue duct 6.

Example of the present invention. The top view of the example of the present invention shown in FIG. Example of the present invention. Conventional example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Forklift 2 Fork 3 Dig removal exclusive jigs 31 and 32 Rail 4 Dust separator 5 Degassing pipe 6 Flue duct 7 Stopper 8 Deck 41 Manhole 42 Manhole cover

Claims (2)

  A method for removing deposits in a flue duct of a vacuum degassing apparatus, wherein a deck is provided around a manhole of a dust separator, and a forklift mounted with a dedicated tool for dust removal on a fork is run on the deck. The dust removing jig is inserted into a flue duct connecting the dust separator and a vacuum tank of a vacuum degassing device, and dust, metal or the like attached to the flue duct is removed. A method for removing deposits in a flue duct of a vacuum degasser.   An apparatus for removing deposits in a flue duct of a vacuum degassing apparatus, comprising a deck provided around a manhole of a dust separator, and a forklift mounted on the deck, the forklift having a dedicated jig for removing dust on the fork When the forklift is operated, the deck has a dedicated dust removal jig attached to the fork of the forklift, and the flue duct connecting the dust separator and the vacuum tank of the vacuum degassing device from the manhole. An apparatus for removing deposits in a flue duct of a vacuum degassing apparatus, wherein the apparatus has a width and height capable of removing dust and metal attached to the flue duct.

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