JP3817066B2 - Dust removal device for heat transfer tubes - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a device for removing dust attached to a heat transfer tube of a boiler or a heat exchanger.
[0002]
[Prior art]
Waste gas such as boilers contains a large amount of dust, and if this dust adheres to the heat transfer tubes, the heat transfer efficiency decreases and the heat recovery efficiency decreases. Therefore, as a method of removing the dust attached to the heat transfer tube, for example, in JP-A-5-164319, a soot blow type dust removal method for removing dust attached by blowing steam or air to the heat transfer tube, As described in Japanese Patent Application Laid-Open No. 59-142399, a dust removing method has been proposed in which a plurality of tube panels are suspended in parallel in a furnace, and a connecting member that restrains the plurality of tubes is hammered.
[0003]
[Problems to be solved by the invention]
However, the soot blow type dust removing method described in Japanese Patent Application Laid-Open No. 5-164319 has a problem that a large amount of steam and air are required, so that the energy efficiency is extremely poor and the heat transfer tube is worn by the sprayed steam.
Also, the dust removal method by hammer ring described in Japanese Patent Laid-Open No. 59-142399 hangs a tube panel in a high temperature furnace and performs hammer ring in the furnace. Corrosion resistance is required, the range of use is limited, and the structure of the hammer ring is complicated, and there is a problem that maintenance inspection is not easy because it is in the furnace.
The present invention has been made in view of such circumstances, and does not directly expose the connecting member or the hanging member to a gas that is corrosive at high temperatures, and can effectively impart vibration to the heat transfer tube. It aims at providing the removal device of the dust adhering to a heat pipe.
[0004]
[Means for Solving the Problems]
The dust removal device for a heat transfer tube according to claim 1, which meets the above object, is a dust removal device for a heat transfer tube in which the heat transfer tubes arranged side by side in the heat transfer tube panel are provided in a direction intersecting the gas flow in the high-temperature gas passage. The heat transfer tube panel passes through the furnace wall of the high-temperature gas passage and is supported in a state sealed by a gas seal casing on the outside thereof, and further, a connection support member that supports one side of the heat transfer tube panel. A vibration generating source for providing intermittent vibration is provided outside the gas seal casing. The vibration generating source includes a hammer for hitting an impact plate attached at an intermediate position of the connection support member in a horizontal direction and an impact by the hammer. There is provided a striking mechanism provided with a coil spring which is provided on the back side of the connecting support member provided with a pressure to oppose the connecting support member in the striking direction .
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Subsequently, an embodiment of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
FIG. 1 is a partially omitted front view of a high-temperature gas passage and a heat transfer tube panel to which a heat transfer tube dust removal device according to an embodiment of the present invention is applied, and FIG. 2 is an application of the heat transfer tube dust removal device. 3A and 3B are partial sectional views of the high-temperature gas passage and the heat transfer tube panel to which the dust removal device for the heat transfer tube is applied, and FIG. 4 is a rotating cam. 5 is a detailed explanatory view of the striking mechanism, FIG. 5 is a detailed explanatory view of the striking mechanism, and FIG. 6 is a detailed explanatory view of the striking mechanism of the dust removing device for heat transfer tubes according to another embodiment of the present invention.
[0006]
First, a high-temperature gas passage 11 to which a dust removal device 10 for a heat transfer tube according to an embodiment of the present invention is applied, and a heat transfer tube panel 12 attached to the high-temperature gas passage 11 will be described with reference to FIGS. .
The hot gas passage 11 is composed of, for example, a boiler having a square cross section or a waste gas passage of a heat exchanger. In order to increase heat exchange efficiency, water flows inside the furnace wall 13 itself as shown in FIG. A heat transfer tube 14 is used. The heat transfer tubes 14 are arranged in parallel with a small gap, and the adjacent heat transfer tubes 14 are connected by an elongated plate 15 (for example, a flat bar) so that no gap is generated.
[0007]
On the other hand, in this embodiment, the heat transfer tube panel 12 is juxtaposed in a direction in which the elongated heat transfer tube 12a is bent in a zigzag shape and intersects the gas flow in the high temperature gas passage 11 (indicated by an arrow in FIG. 1). The bent portions 16 and 17 on both sides are arranged so as to protrude from both sides of the hot gas passage 11, and the inlet side and the outlet side thereof are respectively attached to header pipes 18 and 19 provided on one outer side of the hot gas passage 11. It is connected. Therefore, the elongated plate 15 connecting the heat transfer tubes 14 of the high temperature gas passage 11 is partially cut out and provided with openings 20 and 21, and the openings 20 and 21 are provided on the front side and the base of the heat transfer tube panel 12. The side is detachably inserted.
Box-shaped gas seal casings 22 and 23 are provided outside the openings 20 and 21 so that the gas passing through the hot gas passage 11 does not leak to the outside. The gas seal casing 23 is provided with a drawing port (not shown) through which the heat transfer tube panel 12 is drawn, and a cover (not shown) covering the drawing port is provided to be openable and closable.
[0008]
As shown in FIGS. 2 to 4, the front side of the heat transfer tube panel 12 protruding outward from the furnace wall 13 of the high temperature gas passage 11 is provided with a connection support member 24 to support one side of the heat transfer tube panel 12. Yes. The connection support member 24 includes narrow plates 25 and 26 facing each other and a connection plate 27 that connects these central portions, and the central portion of the connection plate 27 is bent in a U-shape of the heat transfer tube 12a. A plurality of vertical holes 29 into which the portion 16 is fitted are provided. The vertical hole 29 has such a size that the heat transfer tube 12a bent in a U shape can be loosely fitted. When the heat transfer tube 12a is fitted in the vertical hole 29, the heat transfer tube 12a bent in a U shape. Each of the bottoms of the vertical holes 29 is in contact with the bottom side of the vertical hole 29, and has a slight gap 30 from the top side of the vertical hole 29.
[0009]
As shown in FIG. 3, a base plate 31 is provided below the connection support member 24, and a cradle 32 that supports the base plate 31 is provided. The cradle 32 includes a horizontal plate 33 and a pair of ribs 34 fixed to the furnace wall 13 and supporting the horizontal plate 33, and supports the connection support member 24 so as to be movable up and down. As shown in FIG. 4, the upper portion of the connection support member 24 protrudes from the gas seal casing 22, and the tip portion thereof (that is, a part of the connection support member 24) is bent in an L shape, and includes a protrusion 35 on the outside. ing. Since the connection support member 24 is moved up and down at a short distance, a sealing bellows 36 for sealing is provided at a protruding portion from the gas seal casing 22.
[0010]
A rotation cam mechanism 37, which is an example of a vibration generation source that applies vibration to the connection support member 24 in a vertical direction at a short distance, is provided on the protruding portion 35 on the connection support member 24. The rotary cam mechanism 37 includes a reduction motor (not shown), a rotary shaft 38 connected to the output shaft, and a helical cam 39 attached to the rotary shaft 38. The spiral cam 39 gradually increases in the circumferential direction with the reference angle position as the minimum radius, reaches the maximum radius at a position rotated 360 degrees, and then becomes the minimum radius of the reference angle position. And the protrusion part 35 contact | abutted on the outer side of the spiral cam 39, and the connection support member 24 was raised with the increase in the radius of the spiral cam 39, and the spiral cam 39 rotated once and exceeded 360 degree | times. At the position, the connection support member 24 is lowered. By this movement, the heat transfer tube 12a, the tip of which is inserted into each of the vertical holes 29 of the connection support member 24, is elastically bent at a slight angle upward and drops to the original position at the next moment. Repeatedly, the adhering dust is removed by applying intermittent vibration in the vertical direction to the heat transfer tube 12a.
[0011]
As shown in FIGS. 1 and 5, a striking mechanism 40, which is an example of a vibration generating source that applies intermittent vibration in the horizontal direction to the connection support member 24, is provided at an intermediate position of the connection support member 24. The striking mechanism 40 rotates an intermediate position between the air cylinder 42 attached to the outside of the gas seal casing 22 via a support member 41, an L-shaped hammer 43 driven by the air cylinder 42, and the hammer 43. A support member 44 that freely supports, a structure in which the hammer 43 is rotated by expansion and contraction of the air cylinder 42, and an impact plate 45 attached to a part of the connection support member 24 is hit by the hammer 43 in the horizontal direction. It has become. A coil spring 46 that presses the connection support member 24 in the striking direction is provided on the back side of the connection support member 24 to which an impact is applied by the hammer 43. The coil spring 46 has a structure in which the central portion is stored in the storage box 47 from the base end thereof and can be prevented from falling off. Reference numeral 48 denotes a bellows seal.
[0012]
Accordingly, in the heat transfer tube dust removing device 10 according to this embodiment, the rotary cam mechanism 37 applies vertical vibration to the heat transfer tube panel 12, and the striking mechanism 40 applies horizontal vibration to the heat transfer tube panel 12. The dust that is applied and adhered is removed periodically. The removed dust falls downward in the hot gas passage 11 and is discharged to the outside through a butterfly valve or a screw feeder.
[0013]
In the rotary cam mechanism of the above-described embodiment, the helical cam 39 is driven by a reduction motor, but may be driven by a motor driven by a drive source other than electric power.
In the above embodiment, the hammer 43 is driven by the air cylinder 42. However, depending on the case, an electromagnet, a motor, or the like may be used.
In addition, in the said embodiment, although the mechanism in case a heat exchanger tube panel was one row was demonstrated, like the dust removal apparatus 50 of the heat exchanger tube which concerns on other embodiment of FIG. 6, multiple rows of heat exchanger tubes The present invention is applied even when the panel 12 is simultaneously connected by the rotating cam mechanism 37 (not shown) or the striking mechanism 40. FIG. 6 shows an example in which an impact is applied to a plurality of rows of heat transfer tube panels 12 by the striking mechanism 40. Reference numeral 49 denotes a connecting member that connects adjacent connecting support members 24.
[0014]
【The invention's effect】
The dust removal device for a heat transfer tube according to claim 1 , wherein the heat transfer tube panel is supported in a state of passing through the furnace wall of the high-temperature gas passage and sealed by a gas seal casing on the outside thereof, and the heat transfer tube panel Since the connecting support member for supporting one side is provided outside the furnace wall, it is not directly exposed to the gas passing through the inside, and therefore, it can be manufactured at a low cost using a relatively low material. This is particularly effective when the gas temperature is high and corrosive.
Here, since the vibration source has a striking mechanism that applies a horizontal impact to the connection support member, it is possible to apply vibration to the heat transfer tube with relatively small power, thereby efficiently generating dust. Can be removed .
[Brief description of the drawings]
FIG. 1 is a partially omitted front view of a high-temperature gas passage and a heat transfer tube panel to which a dust removal device for a heat transfer tube according to an embodiment of the present invention is applied.
FIG. 2 is a partial cross-sectional view of a high-temperature gas passage and a heat transfer tube panel to which the dust removal device for the heat transfer tube is applied.
3A and 3B are partial detailed views of a high-temperature gas passage and a heat transfer tube panel to which the dust removal device for the heat transfer tube is applied. FIG.
FIG. 4 is a detailed explanatory view of a rotating cam mechanism.
FIG. 5 is a detailed explanatory view of a striking mechanism.
FIG. 6 is a detailed explanatory view of a striking mechanism of a dust removing device for heat transfer tubes according to another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Dust removal apparatus of heat exchanger tube 11 High temperature gas channel 12 Heat exchanger tube panel 12a Heat exchanger tube 13 Furnace wall 14 Heat exchanger tube 15 Elongated plate 16 Bending part 17 Bending part 18 Header pipe 19 Header pipe 20 Opening part 21 Opening part 22 Gas seal casing 23 Gas seal casing 24 Connection support member 25 Narrow plate 26 Narrow plate 27 Connection plate 29 Vertical hole 30 Gap 31 Base plate 32 Receiving base 33 Horizontal plate 34 Rib 35 Projection 36 Sealed bellows 37 Rotating cam mechanism 38 Rotating cam mechanism 38 Rotating shaft 39 Spiral cam 40 striking mechanism 41 support member 42 air cylinder 43 hammer 44 support member 45 impact plate 46 coil spring 47 storage box 48 bellows seal 49 coupling member 50 heat transfer tube dust removing device

Claims (1)

The heat transfer tube arranged in parallel with the heat transfer tube panel is a dust removal device for a heat transfer tube provided in a direction intersecting with the gas flow in the high temperature gas passage,
The heat transfer tube panel passes through the furnace wall of the high temperature gas passage and is supported in a sealed state by a gas seal casing on the outside thereof, and intermittently vibrates on a connecting support member that supports one side of the heat transfer tube panel. A vibration generating source is provided outside the gas seal casing, and the vibration generating source is impacted by a hammer that strikes an impact plate attached to an intermediate position of the connection support member in the horizontal direction and the hammer. A dust removing device for a heat transfer tube, further comprising a striking mechanism provided with a coil spring that is provided on the back side of the connecting support member and presses the connecting support member in the striking direction .

Images