JPS6237754B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a contact heat transfer section with an attached dust removal device in a metallurgical furnace exhaust gas treatment device.

(Prior technology) Conventionally, dust adhering to water pipes in the contact heat transfer section of exhaust gas treatment equipment that cools, collects, and recovers gas emitted from metallurgical furnaces has been removed by blowing it away using a soot blower. . In particular, in the contact heat transfer section 3, which is formed by arranging two groups of water tubes in a meandering manner perpendicular to the gas flow, within the gas cooler or gas conduit 1, as shown in FIGS. 1a, b, and c, There is no other way to remove the dust attached to each water pipe 2 other than by blowing steam, air, nitrogen gas, etc. from the soot blower 4.

(Problem to be Solved by the Invention) However, the method for removing adhering dust using the soot blower 4 can remove dust of loose Fe oxide particles, but Fe vapor scattered outside the furnace due to spitting and sloppying during blowing. When molten oxides such as oxides and Fe oxides reach the contact heat transfer section 3 and adhere to the water tubes 2, the molten oxides are stuck to the water tubes 2 and cannot be removed by the soot blower 4. Also, the above-mentioned smooth
Even dust of Fe oxide particles cannot be removed by the soot blower 4 if it accumulates on the water tube 2 as shown in FIG. 2 and is sintered by exposure to high temperature exhaust gas. As a result, dust adheres and grows between the water pipes and the water pipe panels, which eventually become clogged due to the bridging phenomenon, forcing the metallurgical furnace to shut down.

(Object of the Invention) The present invention has been made to solve these problems, and provides a device that can easily remove dust that has accumulated and solidified in a large number of water pipes arranged in a meandering manner perpendicular to the gas flow. The object of the present invention is to provide a contact heat transfer section with a heat transfer section.

(Means for Solving the Problems) To solve the above problems, the contact heat transfer section with attached dust removal device of the present invention is installed in a gas cooler or a gas conduit in a metallurgical furnace exhaust gas treatment device. A water-cooled hammering tube is held perpendicularly to the water tube group in a contact heat transfer section consisting of a plurality of rows of water tubes arranged in a meandering manner orthogonal to the gas flow, and the outer end of the water-cooled hammering tube is held at right angles to the water tube group. The invention is characterized in that a hammer block is provided, a hammering device is disposed opposite to the hammer block, and a plurality of soot blowers are provided in parallel to the hammering water cooling tube above the water tube group so as to be movable in and out.

(Function) The contact heat transfer section with the attached dust removing device according to the present invention configured as described above is capable of removing the hammer block at the outer end of the water cooling tube for hammering by the hammering device when dust is attached and solidified on each water tube. This applies impact in the length direction of the water-cooled pipe for hammering, thereby applying shock and vibration in a direction perpendicular to the length direction of each water pipe, thereby removing dust that adheres to and hardens on each water pipe. At the same time as it peels off from the adhering surface, a crack is applied, and then a soot blower is placed in the contact heat transfer section and placed above the water tube group to blow steam, air,
Dust can be removed by spraying nitrogen gas or the like almost evenly onto each water pipe.

(Embodiment) An embodiment of the contact heat transfer part with attached dust removal device according to the present invention will be explained with reference to FIGS. 3a, b, and c. A water-cooled pipe 5 for hammering is held perpendicularly to the two groups of water pipes in the contact heat transfer section 3 which is formed by arranging a large number of water pipes 2 in a meandering manner. The folded end of the hammer block 6 is exposed to the outside, a hammer block 6 is provided on the folded end, a hammering device 7 is disposed opposite the hammer block 6, and the hammering device 7 is mounted on the outer wall. A plurality of soot blowers 4, two in this example, are provided above the two groups of water tubes in parallel with the hammering water cooling tubes 5 so as to be removable and removable.

In the contact heat transfer section with the attached dust removal device of the embodiment configured as described above, when dust adheres to each water tube 2 and solidifies, the hammering device 7 removes the folded end of the hammering water cooling tube 5. By hammering the hammer block 6, an impact is applied in the length direction of the water cooling pipe 5 for hammering, thereby applying impact and vibration in a direction perpendicular to the length direction of each water pipe 2, and The dust that has accumulated and solidified is removed from the adhering surface and at the same time a crack is introduced. After that, the two soot blowers 4 are connected to the contact heat transfer section 3.
It is placed in the upper part of the 2 groups of water pipes, and steam, air,
Dust is removed by spraying nitrogen gas or the like almost equally onto each water pipe 2.

In this case, the soot blower 4 may blow off the dust while being inserted into and taken out of the contact heat transfer section 3, or may be inserted into the contact heat transfer section 3 for a certain length and left in place to blow off the dust.

(Effects of the Invention) As detailed above, the contact heat transfer unit with attached dust removing device of the present invention is capable of reducing the amount of dust that adheres to each water pipe due to the impact in the length direction of the water cooling pipe when the dust is deposited and solidified on each water pipe. Shocks and vibrations are applied in a direction perpendicular to the length direction of the water pipes to peel off the solidified dust that has adhered to each water pipe 2 from the adhesion surface of the water pipes, and at the same time crack the dust. The dust is easily blown away from the water pipe by blowing any gas or the like onto the water pipe. Therefore, no dust bridging phenomenon occurs between the water pipes and the water pipe panels, and no clogging occurs, so the metallurgical furnace does not stop operating.

If the water tube 2 of the contact heat transfer section 3 is replaced from a round tube to a water tube 2' with fins 2a attached in the direction of gas flow as shown in FIG. Since the dust deposited and solidified on both sides of the fins 2a is easily peeled off from the water pipe 2', the dust removal effect by the soot blower is further improved.

[Brief explanation of the drawing]

Fig. 1 shows a method for removing adhering dust from a contact heat transfer part of a conventional metallurgical furnace exhaust gas treatment equipment, in which a is a schematic longitudinal sectional view, b is a sectional view taken along the line A--A in Fig. a, and c is a
2 is a cross-sectional view showing the state of adhesion and solidification of dust on the water pipe; FIG. 3 is a sectional view of the metallurgical furnace exhaust gas treatment device according to the present invention with a catalytic heat transfer device for removing adhering dust. 4 is a schematic longitudinal cross-sectional view, b is a cross-sectional view taken along line C-C in figure a, c is a cross-sectional view taken along line D-D in figure a, and Figure 4 is a cross-sectional view showing another example of the water pipe. It is. 1... Gas cooler or gas conduit, 2, 2'... Water pipe, 2a... Fin, 3... Contact heat transfer section, 4... Soot blower, 5... Water cooling pipe for hammering, 6... Hammer block, 7... Hammering device .

Claims (1)

[Claims] 1. From a group of multiple rows of water pipes arranged in a meandering manner perpendicular to the gas flow in a gas cooler or gas conduit in an exhaust gas treatment device that cools, collects, and recovers gas emitted from a metallurgical furnace. A water-cooled hammering tube is held perpendicularly to the water tube group in the contact heat transfer section, a hammer block is provided at the outer end of the water-cooled hammering tube, and a hammering device is disposed opposite to the hammer block. A contact heat transfer section with an attached dust removal device in a metallurgical furnace exhaust gas treatment device, characterized in that a plurality of soot blowers are installed in parallel with the hammering water-cooled tubes above the water tube group so as to be movable in and out.