JPS61149721A - Soot blowing device - Google Patents

Abstract

PURPOSE:To make a high efficiency of soot blowing operation with a nozzle being approached to a heat exchanget without producing any dead angle by a method wherein the nozzle is supported on a frame which is supported in the chimney through a displacement guiding frame. CONSTITUTION:A displacement guiding frame 7 is composed of a moveable guiding frame 20 for guiding a reciprocating displacement of a base frame 6 in one direction (direction X) on a plane (XZ plane) which is parallel to an end surface of a heat exchanger 2 within a chimney 1 and the fixed guiding frames 21 and 21 for use in guiding a base frame 6 and a moveable guiding frame 20 in the direction Z which is perpendicular to the direction X on the XZ plane. A driving device 8 is comprised of a moveable frame driving mechanism 22 for reciprocating and driving the moveable guiding frame 20 in the direction Z and the base frame driving mechanism 23 for reciprocating and driving the base frame 6. With this arrangement, the base frame 6 and the nozzle 4 can be displaced along the XZ plane by the driving mechanism 8. An extendable pipe 15 is inserted into a space within a coil at the flexible part 14 which is arranged between the nozzle 4 and the fixed part 10.

Description

Detailed Description of the Invention "Field of Industrial Application" This invention is applicable to soot blowers, that is, heat exchangers for exhaust heat recovery installed in the middle of exhaust pipes or flues of internal combustion engines, boilers, etc. Regarding the device for removing adhered soot using high-pressure fluid, in detail, it is designed to be compact and highly durable, capable of strong soot removal without creating blind spots where the soot blowing effect is insufficient. Regarding what has been improved.

"Conventional Example" Conventionally, as a method of removing soot attached to a heat exchanger for exhaust heat recovery installed in the middle of an exhaust pipe or flue of an internal combustion engine or boiler, etc., using high-pressure fluid, for example, 3
As shown in Publication No. 016, there is a method of burning and removing foreign substances such as soot attached to heat transfer tubes of a heat exchanger using a mixed gas of superheated steam and air or only superheated steam, and a method that the present inventor previously proposed. As proposed in Japanese Patent Application No. 56-45867, a large amount of pressure fluid is instantaneously injected from the outside of the flue into the inside to cause a small explosion within the designed safety range, and the explosion is caused by the instantaneous expansion. There are methods to remove soot using sudden changes in the atmosphere, such as shock waves, and pressurized fluid itself.

In order to carry out these methods, a high-pressure fluid supply device for supplying high-pressure fluid from the outside to the inside of the flue, etc., and one or more nozzles that blow the high-pressure fluid from this device into the inside of the flue, etc. is provided. However, in these conventional examples, the nozzle is fixed to the peripheral wall of the flue, etc., and there is a drawback that soot cannot be removed sufficiently, that is, a blind spot occurs over a relatively wide range.

In order to eliminate such drawbacks, for example,
As shown in Japanese Patent No. 39727, there is a method that attempts to narrow the range in which a blind spot occurs by linearly displacing a nozzle in one direction.

In this case, the fixed part of the pressure fluid supply device fixed to the peripheral wall of the flue and the nozzle are connected to each other through a telescopic tube. This telescoping tube is equipped with a sliding tube with a high degree of sealing performance for passing pressurized fluid inside. However, since such a sliding head with high sealing performance is expensive, this conventional type has the disadvantage of being expensive. In addition, foreign matter such as soot adhering to the surface of the telescopic tube while the telescopic tube is expanded and contracted enters the space between the sliding head and the retractable tube, causing wear and impairing its sealing performance. There is.

In addition to being able to cover a wider range of areas where blind spots occur,
As a device that does not have the drawbacks of the above-mentioned conventional examples, there is a soot blowing device proposed in Patent Application No. 118719 filed in 1982 by the present applicant.

In the soot blowing device according to the applicant's earlier application, the nozzle supported by the underframe is moved two-dimensionally within the flue, and the fixed part of the pressure fluid supply device fixed to the peripheral wall of the flue and the smoke The pressure fluid supply device is provided with a coil-shaped flexible portion that communicates with a nozzle that moves two-dimensionally within the channel.

However, in this case, it has been found that the middle part of the coil-shaped flexible part sag, increasing the height and volume occupied by the flexible part, and that this flexible part may move unnecessarily and cause fatigue failure. Ta.

"Problems to be Solved by the Invention" This invention was devised under these circumstances, and the problem to be solved is that The purpose is to prevent the intervening coil-shaped flexible portion from sagging, to make the entire device smaller and more compact, and to make it difficult for fatigue failure to occur due to unintentional movement of the flexible portion.

"Means for Solving the Problems" The present invention takes the following technical means to achieve the above object.

A nozzle that spouts high-pressure fluid toward a heat exchanger for exhaust heat recovery installed in the middle of the exhaust pipe or flue of an internal combustion engine or boiler, and a two-dimensional an underframe that can be displaced automatically, a driving means for driving the underframe, and a high-pressure fluid supply device that supplies high-pressure fluid to the nozzle, and the high-pressure fluid supply device is fixed to a peripheral wall of the flue or the like. In a soot blower equipped with a fixed part and a flexible coiled part connecting the nozzle to the fixed part, a telescopic tube is inserted into the flexible part, and one end of the telescopic pipe is connected to the flexible part. The other end of the valve device or the peripheral wall is swingably connected to the underframe.

"Embodiments" Hereinafter, the present invention will be explained in more detail through embodiments shown in the drawings.

FIG. 5 is a sectional view schematically showing a flue equipped with a soot blower according to the present invention. The flue 1 is connected to a combustion device such as a boiler (not shown), and is provided with heat exchangers 2 for exhaust heat recovery, for example, in two stages, spaced apart at appropriate intervals, along the way. A soot blower 3 according to the present invention is provided below each heat exchanger 2.

As shown in FIG. 2, each soot blower 3 has four nozzles 4 that eject high-pressure fluid toward the heat exchanger 2 directly above it.
Equipped with... These nozzles 4... are connected to the heat exchanger 2
The underframe 6 is connected via a branch pipe 5 extending in an H-shape along the end face of the
is supported by This underframe 6 is supported so as to be two-dimensionally displaceable along the end face of the heat exchanger 2 via a displacement guide frame 7 which will be described later.

Further, this underframe 6 is driven in its displacement direction by a drive device 8 as described later. A part 1o of a high-pressure fluid supply device for supplying high-pressure fluid to the nozzles 4 is fixed to the outside of the peripheral wall 9 of the flue 1. Although not shown, this high-pressure fluid supply device has a water source and a water source. It has a high-pressure water pump that pumps water from this water source, pressurizes it to high pressure, and sends it out, and high-pressure water piping that extends from this pump to the fixed part 10.

The fixing portion 10 and the branch pipe 5 supported by the underframe 6 are connected to each other through a connecting pipe 11 .

The connecting pipe 11 is arranged in the flue l, and as shown in FIG. and a flexible portion 14 that connects the proximal end portion 12 to the collecting pipe 13. The flexible portion 14 is made of a metal with high heat resistance and pressure resistance, such as stainless steel, and is formed into a coil shape. A telescopic tube 15 is inserted into the space within the coil of the flexible portion 14 . This telescopic tube 15 is composed of four tubes 15a to 15C of different diameters that are fitted together so as to be slidable and not to be pulled out in the direction of extension, and one end of the tube is connected to the base end portion 12 and the distal end thereof. It is swingably connected to the fixed part lO by a pin 17 via a bracket 16 fixed to the part, and the other end is connected to the branch pipe 5, the collecting pipe 13, and another pipe fixed to the falling tip part thereof. Bracket 1
8 to the nozzles 4 through another pin 19 so as to be swingable.

The displacement guide frame 7 is, for example, as shown in FIG. The movable guide frame 20 makes the reciprocating displacement of the frame 6 completely white, and the fixed guide frame 21.21 makes the underframe 6 and the movable guide frame 20 pure white in the Z direction perpendicular to the X direction on the XZ plane.

The drive device 8 includes a movable frame drive mechanism 22 for reciprocating the movable guide frame 20 in the two directions, and an underframe drive mechanism 23 for reciprocating the underframe 6 in the X direction.

As shown in FIG. 3, the movable frame drive mechanism 22 includes sprockets 22a, 22a rotatably supported at both ends of a fixed guide frame 21.21 in the Z direction.

22b, 22b, and each chain 22c, 22c is wound between the sprockets 22a, 22b forming a pair in two directions, and is connected to the movable true inner frame 20. The movable frame drive mechanism 22 further includes a motor 22d that drives one of the sprockets 22a, 22a in the Z direction.

As shown in FIG. 4, the underframe drive mechanism 23 includes pipe members 23a each pivotally supported at both ends of the movable guide frame 20 in the X direction so as to be rotatable around the Z axis.

23b, and a total of four sprockets 23c, 23 each fixed to each end of each pipe member 23a, 23b.
c, 23d, 23d, and the sprockets 23C, 23d that form a pair in the X direction, and are wound around the underframe 6.
The chains 23e and 23e connected to the chains 3a and 23b and one pipe member 23a are fitted externally so as to be slidable in the Z-axis direction but not relatively rotatable. a transmission shaft 23r rotatably supported around the
It has a motor 23g that drives this transmission shaft 23f.

According to the soot blower ff3 configured in this way, the underframe 6 and the nozzle 4 can be freely displaced along the XZ plane by the drive device 8. Therefore, by moving the nozzle 4, blind spots that occur when the nozzle 4 approaches the end face of the heat exchanger 2 can be successively covered, and as a result, blind spots can be eliminated. Furthermore, since the telescopic tube 15 is inserted into the space within the coil of the flexible portion 14 provided between the nozzle 4 and the fixed portion 10,
Even if the coil diameter of the flexible section 14 is made small, the flexible section 14 will not sag. Therefore, the diameter of this coil can be reduced to make it smaller and more compact. Further, since the flexible section 14 can be prevented from moving inadvertently by the telescopic tube 15, fatigue due to the unintentional movement of the flexible section 14 within the flue 1 can be reduced, and durability can be increased.

"Effects of the Invention" As explained above, according to the present invention, the nozzle is supported on the underframe which is displaceably supported inside the flue etc. along the end face of the heat exchanger via the displacement guide frame. By driving this underframe with a driving means, the nozzle can be freely displaced on a plane along the end surface of the heat exchanger. Therefore, the blind spot caused by bringing the nozzle close to the end face of the heat exchanger can be covered by moving the nozzle, and as a result, the blind spot can be eliminated. In other words, it is possible to bring the nozzle close to the heat exchanger and obtain a strong soot removal effect without creating a blind spot. In addition, since the telescopic tube is inserted into the space within the coil of the flexible section provided between the nozzle and the valve device fixed to the peripheral wall of the flue, etc., it is possible to reduce the diameter of the coil of the flexible section. The flexible portion does not sag, and the coil diameter can be reduced to make it small and compact.

Furthermore, the elastic tube can suppress the flexible part from moving uncontrollably, reducing fatigue caused by the flexible part moving inside the flue, and increasing durability.

Of course, the present invention is not limited to the above-mentioned embodiment. For example, the driving means may be a manual type. Also, for a flue with a circular cross section, the displacement guide frame is not limited to the flue or the like. It may be composed of a rotating frame that rotates around the center of the rotating frame and an underframe that advances or retreats in the radial direction of the flue or the like along the rotating frame. In this case, the driving means is a rotating frame that drives the rotating frame. It is composed of a drive mechanism and an underframe drive mechanism that drives the underframe independently of the rotation of the rotating frame. Furthermore, a mixture of superheated steam and air or only steam may be used as the high-pressure fluid.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is a sectional view taken along the bar-ri line in FIG.
FIG. 4 is a sectional view taken along the line rV-IY in FIG. 1, and FIG. 5 is a schematic sectional view of a flue equipped with a soot blower according to the above embodiment. 1... Flue, 2... Heat exchanger, 4...
Nozzle, 6... Underframe, 7... Displacement guide frame,
8... Drive means 9... Peripheral wall, lO・
...Fixed part, 11...Connecting pipe, 14...Flexible part, 15...Extensible pipe.

Claims (1)

[Claims] (1) A nozzle that spouts high-pressure fluid toward a heat exchanger for exhaust heat recovery installed in the middle of the exhaust pipe or flue of an internal combustion engine or boiler, and a nozzle that supports this nozzle and extends along the heat exchanger. an underframe that can be displaced two-dimensionally by means of an underframe; a driving means for driving the underframe; and a high-pressure fluid supply device that supplies high-pressure fluid to the nozzle; In a soot blowing device that is provided with a fixed part fixed to the fixed part and a coil-shaped flexible part that connects the nozzle to the fixed part, a telescopic tube is inserted into the flexible part, and one end of the telescopic pipe is inserted into the flexible part. A soot blowing device characterized in that the other end of the soot blower is swingably connected to the valve device or the surrounding wall and the other end to the underframe.