JP5535429B2 - Removal device - Google Patents

Description

  The present invention relates to a removal apparatus for cleaning and removing a boiler tube and a boiler furnace wall.

As shown in FIGS. 5 and 6, a conventional boiler tube and boiler furnace wall removal device (deslugger) 1 includes a swivel tube 2 that is a cylindrical pipe for supplying steam, and a steam ejection hole (hereinafter referred to as a steel pipe tip). The swivel tube 2 and the nozzle head 3 have the same outer diameter (diameter), and the tip of the nozzle head 3 is formed at the hemispherical tip 7. It was.
The steam A is discharged from the nozzle 4 of the dehairing device 1 as shown in FIG. 7 to periodically clean the boiler tube 6 and the boiler furnace wall 5. There was a problem that the tip 3a of the nozzle head 3 was cracked by receiving the radiant heat B from the furnace 8 (see FIGS. 6 and 7).
Cracks occur when the temperature of the nozzle head 3 part becomes high (about 650 to 950 ° C.) due to the influence of furnace radiation, and a temperature difference (about 50 to 200 ° C.) occurs between the nozzle head 3 part and the nozzle head tip 3 a. It was caused by a thing. If the nozzle head 3 cracks, it will not be removed and the boiler heat exchange efficiency will be reduced, so it was necessary to stop the operation of the boiler and perform inspection, repair and replacement work in a relatively short period of time. .
Conventionally, a soot blower that includes a nozzle head at the tip of a swivel tube, covers the entire nozzle head with a radiant heat shielding wall, and discharges the fluid while being exposed to the furnace through the radiant heat shielding wall (see Patent Document 1). ), And a soot blower device in which a buffer body is provided in a tip end space of a lance pipe provided with a nozzle has been proposed (see Patent Document 2).

JP 2004-293994 A (FIG. 1) JP 2002-310422 A (FIG. 1)

  The present invention has been made in view of the above-described conventional problems, and proposes to reduce the thermal load on the nozzle head during standby and removal of the removal device, and to extend the life of the removal device. .

In order to solve the above problems, the present invention employs the following means (1) to (2).
(1) The nozzle head appears and disappears from the hole provided in the boiler furnace wall, and the fluid from the swivel tube is discharged from the nozzle of the nozzle head in a state where the nozzle head is directly exposed in the furnace, and the boiler tube and the boiler furnace wall of the removal the soot apparatus for performing removal soot, the opening of the hole of the boiler furnace wall, to inserting an annular refractory wall having a smaller diameter hole than the diameter of the hole of the boiler furnace wall Rutotomoni, the tip of the nozzle head A scissor removing apparatus characterized in that the outer diameter is smaller than that of the swivel tube and smaller than the hole of the refractory wall, and the nozzle head and the refractory wall do not interfere when the nozzle head comes out of the boiler furnace wall.
(2) The nozzle head is a mold-integrated molded product having an end having the same diameter as the swivel tube at the base end, and is joined to a straight pipe end of a stainless swivel tube. And the hair removal apparatus according to (1).

(1) first means, the opening of the hole of the boiler furnace wall, to inserting an annular refractory wall having a smaller diameter hole than the diameter of the hole of the boiler furnace wall Rutotomoni, outside of the tip portion of the nozzle head The diameter is smaller than the swivel tube and smaller than the hole in the fire wall, and when the nozzle head comes out of the boiler furnace wall, the nozzle head and fire wall do not interfere with each other. The amount of radiant heating from the inside of the furnace can be reduced, and the life of the removal device can be extended.
(2) The second means has the function and effect described in (1) above, and the nozzle head is an integrally molded product in which an end portion having the same diameter as the swivel tube is formed at the base end portion thereof, Since it is joined to the straight pipe end of the swivel tube made of stainless steel, the nozzle head and the swivel tube can be joined easily, and a small-diameter nozzle head can be manufactured easily and at a lower cost than conventional ones.

Example 1
FIG. 1 is a cross-sectional view of a dehulling apparatus according to Embodiment 1 of the present invention, and FIG. 2 is a cross-sectional view showing a waiting state of the dehulling apparatus of FIG.
As shown in FIGS. 1 and 2, the present dehulling apparatus is configured such that the nozzle head 3 protrudes and emerges from a hole 10 provided in the furnace wall 5 of the boiler and is directly exposed in the furnace 8. Is discharged from the nozzle 4 of the nozzle head 3 to remove the boiler tube 6 and the furnace wall 5 of the boiler.
The nozzle head 3 is a mold (integral) molded product having an end of the same diameter as that of the swivel tube 2 at its base end, and is positioned at a position C in the straight pipe end of the stainless swivel tube 2 in the figure. Butt welded with.
In addition, the outer diameter (caliber) D of the hemispherical tip 3a of the nozzle head 3 of the hair removal device 1 is made smaller by about 10 to 50% than the outer diameter (caliber) D1 of the swivel tube 2.
Thus, by reducing the outer diameter D of the nozzle head 3 from the outer diameter D1 of the swivel tube 2, the heat receiving area (orthotropic area) that receives the radiant heat B from the furnace 8 can be reduced, and the amount of heat received can be reduced. By reducing the temperature of the tip portion 3a of the nozzle head 3, the heat resistance of the hair removal device 1 (nozzle head 3) can be increased, and a longer-term use is possible.
That is, by making the nozzle head 3 portion of the dehuller 1 smaller in diameter than the swivel tube 2, the influence of the radiant heat B on the nozzle head 3 from the furnace 8 during standby and during cleaning is reduced. The temperature difference generated in the tip portion 3a and the entire temperature and the plate thickness direction can be reduced to extend the life.
In the present removal apparatus 1, steam is discharged from the nozzle 4 in the same manner as that shown in FIG. 7 to remove the soot adhering to the furnace wall 5.
Further, as shown in FIG. 2, the standby position of the nozzle head 3 is further drawn to the outside of the furnace than the conventional standby position 13, and is shifted to the standby position 14 indicated by a solid line, thereby reducing the temperature rise of the nozzle head 3, Furthermore, the structure is designed to extend the life. In FIG. 2, 6 indicates a boiler tube, and 12 indicates a furnace wall position.

(Example 2)
FIG. 3 is a cross-sectional view showing a waiting state of the dehulling apparatus according to the second embodiment of the present invention, and the entire structure of the dehulling apparatus is the same as that of the above embodiment.
3 is retracted into a hole 10 (outer side of the furnace) provided in the boiler wall 5 of the boiler during standby, but the boiler wall 5 of the boiler and the cylindrical portion of the nozzle head 3 are retracted. In this embodiment, there is a gap between the cylindrical portion and the tip portion 7, which is still susceptible to the influence of radiant heat B from inside the furnace 8 even during retraction. 5 is provided with a refractory wall 11 that fills the gap with the tip of the nozzle head 3 and narrows the gap, thereby reducing the influence of radiant heat B from the furnace 8 and the temperature rise. This is intended to extend the life of the dehuller 1.
Moreover, the fire wall 11 is comprised by the cylinder part inserted in the hole 10, and the disk shaped member along the corner | angular part of the furnace wall 5 of a boiler.
In this embodiment, the example using the small-diameter nozzle head 3 shown in the first embodiment has been described. However, the conventional nozzle head 3 (see FIGS. 5 to 7) having the same diameter as the swivel tube 2 was used. Even in this case, it is effective to install the fire wall 11 above.

(Example 3)
FIG. 4 is a cross-sectional view showing a dehulling apparatus according to a third embodiment of the present invention, and the entire structure of the dehulling apparatus is the same as that of the first embodiment.
4 is provided with a bottomed cylindrical radiant heat shielding wall 7 covering the outer periphery of the tip 3a of the nozzle head 3 shown in the first embodiment, and the radiant heat and the tip 3a of the nozzle head 3. A thermal shock absorbing material 9 is provided between the shielding wall 7 and the shielding wall 7.
In the present embodiment, by providing the radiant heat shielding wall 7 and the thermal shock absorbing material 9, the amount of radiant heating from the furnace is reduced and the temperature level and the generated temperature difference are the same as in the first and second embodiments. This reduces the material deterioration (oxidation, σ embrittlement, creep) caused by the thermal history, prevents cracking, and extends the life of the dehuller 1. The radiant heat shielding wall 7 is attached to the distal end portion 3a by screwing, but may be welded.
Further, the radiant heat shielding wall 7 is provided with an injection hole 7 a, and the injection hole 7 a is installed so as to match the nozzle 4 hole of the nozzle head 3. The thermal shock-absorbing material 9 may be filled with a ceramic or metal plate or stacked with a billet.
In this embodiment, the example using the small-diameter nozzle head 3 shown in the first embodiment has been described. However, the conventional nozzle head 3 (see FIGS. 5 to 7) having the same diameter as the swivel tube 2 was used. Even in this case, it is effective to provide the radiant heat shielding wall 7 and thermal shock absorber 9 above.

  Moreover, it is good also as what was equipped with all the characteristic structures of the said Examples 1-3, ie, reducing the diameter of the front-end | tip part 3a of the nozzle head 3, installing the fireproof wall 11, providing the radiant heat shielding wall 7, It is good also as a structure filled with the thermal shock-absorbing material 9.

  In addition, the present invention is not limited to the above-described embodiment, and can be appropriately changed in design as necessary.``In addition, each component in the above-described embodiment can be easily assumed by those skilled in the art, The substantially same thing is included.

It is sectional drawing which shows the hair removal apparatus which concerns on Example 1 of this invention. It is sectional drawing which shows the state in standby of the dehairing apparatus shown in FIG. It is sectional drawing which shows the state in the middle of the standby of the hair removal apparatus which concerns on Example 2 of this invention. It is sectional drawing which shows the hair removal apparatus which concerns on Example 3 of this invention. It is sectional drawing which shows the nozzle head part of the conventional removal apparatus. It is sectional drawing which shows the state in the standby of the conventional dehulling apparatus. It is sectional drawing which shows the state during the washing | cleaning of the conventional dehairing apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Dehumidifier 2 Swivel tube 3 Nozzle head 3a Nozzle head tip 4 Nozzle 5 Furnace wall 6 Boiler tube 7 Radiation heat shielding wall 8 Furnace 9 Thermal shock absorbing material 10 Hole 11 Fire wall A Steam B Radiation heating from the furnace ( (Radiant heat)

Claims (2)

The nozzle head appears and disappears from the hole provided in the boiler furnace wall, and the fluid from the swivel tube is discharged from the nozzle of the nozzle head in a state where it is directly exposed in the furnace, so that the boiler tube and the boiler furnace wall are removed. the dehumidifying soot apparatus for performing, in the opening of the hole of the boiler furnace wall, to inserting an annular refractory wall having a smaller diameter hole than the diameter of the hole of the boiler furnace wall Rutotomoni, the outer diameter of the tip portion of the nozzle head An apparatus for removing hair characterized by being formed smaller in diameter than a swivel tube and smaller in diameter than a hole in a refractory wall, so that the nozzle head and the refractory wall do not interfere when the nozzle head comes out of the boiler furnace wall.   The nozzle head is an integrally molded product in which an end portion having the same diameter as the swivel tube is formed at a base end portion thereof, and is joined to a straight pipe end portion of a stainless swivel tube. Item 2. A hair removal apparatus according to Item 1.

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