JP5132190B2 - Foreign material removal tool - Google Patents

Description

  The present invention relates to a foreign matter removing tool, and more particularly to a structure of a foreign matter removing tool that removes foreign matter accumulated on an object to be cleaned with compressed air.

The generator provided in the thermal power plant includes a type that drives a gas turbine using LNG as a fuel, a type that drives a steam turbine by burning LNG in a boiler, and a boiler that burns coal as pulverized coal. There is a type that generates a high-pressure steam to drive a steam turbine. Since the exhaust heat gas discharged from the gas turbine and boiler is very hot, it is not only dangerous to be released into the atmosphere as it is, but it also goes backwards in terms of effective use of energy. Therefore, by effectively using the exhaust heat gas, water is heated by a heat exchanger, and the heated water is heated by a boiler to generate high-pressure steam to drive the steam turbine. To save energy.
The heat exchanger has many fin tubes that allow water to flow, and exhaust heat gas is blown onto the fin tubes to exchange heat. However, the exhaust heat gas has an ash-like shape that cannot be completely removed by the denitration equipment. Foreign matter is included, and the foreign matter adheres to the fin tube, which is a major factor in reducing the efficiency of heat exchange. Therefore, conventionally, this foreign matter has been removed by jetting compressed air from a nozzle attached to the end of a long pipe.

Further, Patent Document 1 as a prior art of a nozzle includes a pipe joint, a nozzle pipe, an O-ring, a spacer, and a cap nut, and an internal thread formed on the inner periphery of the cap nut is connected to the outer periphery of the pipe attachment portion of the pipe joint. The flare part of the nozzle pipe is pressed by pushing the flare part formed at the base end of the nozzle pipe through the O-ring toward the tip of the pipe attachment part of the pipe joint by screwing and tightening to the male thread part formed on An ultra-fine flexible nozzle for an air gun is disclosed in which a portion is brought into close contact with an end face of a pipe attachment portion of a pipe joint to prevent leakage of compressed air from between an end face of the pipe attachment portion of the pipe joint and a flare portion of the nozzle pipe.
JP 2006-35168 A

The conventional nozzle method removes the nozzle while inserting the nozzle into the gap between the fin tubes, but since the compressed air is jetted from the tip of the nozzle along the axial direction of the nozzle, the nozzle is placed in the gap. There is a problem in that it is difficult to accurately remove foreign substances adhering in a direction different from the direction in which insertion is possible, which requires time and effort.
Moreover, although the prior art currently disclosed by patent document 1 can prevent the leakage of the compressed air from between the end surface of the pipe attachment part of a pipe joint, and the flare part of a nozzle pipe, compressed air is the tip of a nozzle. Therefore, it has the same problem as described above.

  The present invention has been made in view of such problems, and a nozzle is provided at the tip of the tube, and the injection direction of the compressed air injected from the injection port provided in the nozzle is the axial direction of the tube (can be inserted). In order to accurately remove foreign matter adhering to a peripheral position different from the nozzle insertion direction, and to provide a foreign matter removing tool with improved foreign matter removal efficiency. The purpose is to do.

In order to solve this problem, the present invention provides a foreign matter removing tool for removing foreign matter accumulated on the fin tubes of the exhaust heat recovery heat exchanger arranged at a predetermined interval in the depth direction , A tubular body that conveys compressed air having a predetermined pressure; a nozzle that is provided at a distal end of the tubular body to inject the compressed air; and a rotating mechanism that rotates a part of the nozzle when the compressed air is supplied. The tube includes a plurality of injection ports arranged in the longitudinal direction at intervals equivalent to the arrangement interval of the fin tubes, and the nozzle has an injection direction of the compressed air of the tube It comprises at least two injection ports that are approximately 45 degrees with respect to the axial direction and whose cross-sectional shape is tapered toward the injection direction of the compressed air, and a straight line connecting the injection ports It is characterized in that perpendicular to the axis of the tube .
The foreign matter removing tool of the present invention includes a tube body and a nozzle attached to the tip of the tube body. The nozzle is provided with at least one injection port, and the injection port is configured such that the injection direction of the compressed air is shifted by a predetermined angle with respect to the axial direction of the tubular body. As a result, even when the cleaning objects are arranged in the depth direction and the entire angle cannot be moved up and down, the compressed air can be applied to the optimal position only by moving the nozzle along the cleaning object. Foreign matter can be efficiently removed.

In addition , when the objects to be cleaned are arranged in the depth direction, not only the foreign objects are removed while the nozzle is inserted into the objects to be cleaned, but also the remaining foreign objects after compressed due to the compressed air injected from the tube outlet. Can be further removed.

In addition, the cleaning ability is not so high when the nozzle provided in the nozzle is the same as the axial direction of the tube. That is, when the objects to be cleaned are arranged in the depth direction and the entire angle cannot be moved up and down, the angle of the nozzle tip cannot be changed so much, and the cleaning range is limited. Therefore, in the present invention, the injection port is configured so that the injection direction is approximately 45 degrees with respect to the axial direction of the tubular body. Thereby, compressed air can be injected in a wide range with respect to the cleaning object.

When the objects to be cleaned are arranged in the depth direction and are above and below, cleaning is performed by inserting a nozzle therebetween. At this time, it is preferable that at least two nozzle outlets are provided and arranged so that the positions thereof face each other. Thereby, the foreign material of the cleaning object which exists up and down can be removed simultaneously by insertion of a nozzle once.

Further, the speed (wind speed) of the compressed air increases as the area of the tubular body through which the compressed air decreases. Therefore, in the present invention, the foreign matter is removed by a strong injection force by forming the cross-sectional shape of the injection port into a tapered shape whose diameter becomes narrower in the compressed air injection direction.

Further, when the arrangement of the nozzle injection ports is fixed, compressed air cannot be injected to all foreign substances as they are. If the foreign object can be visually recognized, the injection port can be directed in that direction. However, if the foreign object cannot be visually recognized, a place where the foreign object cannot be completely removed is generated. Therefore, in the present invention, a part of the nozzle having the injection port is configured to be rotatable, and when compressed air is supplied, the rotation mechanism is rotated by the wind pressure, and the compressed air is injected all around. is there. Thereby, compressed air can be efficiently applied to a cleaning target.

According to a second aspect of the present invention, the tubular body is configured to be extendable and contractible.
When the length of the tube is fixed in accordance with the size of the object to be cleaned, it is not possible to cope with cleaning a longer object to be cleaned. Therefore, in the present invention, the tube body is configured to be extendable. Thereby, it can respond to the size of the cleaning object flexibly.

Claim 3 is provided with at least two injection openings around the tube, the straight line connecting the respective injection port is characterized in that arranged perpendicular to the axis of the tubular body.
When the objects to be cleaned are arranged in the depth direction and above and below, cleaning is performed by inserting a tube between them. At this time, it is preferable that at least two injection holes of the tubular body are provided so that the positions thereof face each other. Thereby, the foreign material of the cleaning object which exists up and down can be removed simultaneously by insertion of a tubular body once.

According to a fourth aspect of the present invention, there is provided heating means for heating the compressed air .
When the object to be cleaned is hot, when the low-temperature compressed air is injected there, the object to be cleaned may contract rapidly due to a temperature difference, resulting in metal breakage. Therefore, it is important that there is no significant difference between the compressed air and the temperature of the object to be cleaned. Therefore, in the present invention, the compressed air is heated to a predetermined temperature and supplied to the tube. Thereby, damage to the cleaning object can be prevented in advance.

According to the present invention, there is provided a foreign matter removing tool for removing foreign matter accumulated on a fin tube of an exhaust heat recovery heat exchanger, a tubular body that conveys compressed air having a predetermined pressure, and a distal end of the tubular body. Provided with a nozzle for injecting compressed air, the nozzle is provided with at least one injection port, and the injection port is configured such that the injection direction of the compressed air is deviated from the axial direction of the tubular body by a predetermined angle. Even when the fin tubes are arranged in the depth direction and the entire angle cannot be moved up and down, the compressed air can be applied to the optimal position to remove foreign matters simply by moving the nozzle along the fin tube. be able to.

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. However, the components, types, combinations, shapes, relative arrangements, and the like described in this embodiment are merely illustrative examples and not intended to limit the scope of the present invention only unless otherwise specified. .
FIG. 1 is an overall configuration diagram of an exhaust heat recovery heat exchanger provided in a thermal power plant. The exhaust heat recovery heat exchanger 100 receives exhaust heat gas discharged from a gas turbine 1 (not shown) from the duct 2, and the high temperature exhaust heat recovery heat exchanger 3 causes the fin tube (water to flow with the hottest exhaust heat gas). Warm the tube with fins. At this time, ash-like foreign matter contained in the exhaust heat gas accumulates on the fin tube, and is periodically removed and collected by the hopper 4. The exhaust heat gas that has passed through the high-temperature exhaust heat recovery heat exchanger 3 is subjected to heat exchange and the temperature is lowered, but it is still high. Further, since nitrogen oxides contained in the exhaust heat gas pollute the atmosphere, the nitrogen oxides are removed by the denitration device 5. The exhaust heat gas from which the nitrogen oxides have been removed is further supplied to the exhaust heat recovery heat exchanger 7 through the duct 6. The exhaust heat recovery heat exchanger 7 is composed of three parts, and includes a high temperature exhaust heat recovery heat exchanger 7a, an intermediate temperature exhaust heat recovery heat exchanger 7b, and a low temperature exhaust heat recovery heat exchanger 7c, and performs heat exchange in stages. It is. And since the ash-like foreign material accumulates on the fin tube also in these exhaust heat recovery heat exchangers, it is periodically removed by a foreign material removing tool as will be described later and recovered by the hopper 8.

  FIG. 2 is a schematic view showing how foreign matters accumulated on the exhaust heat recovery heat exchanger are removed. For example, if the fin tubes 18 are configured to have a height of about 10 m in four rows with a distance d, and there are two blocks, the scaffold 12 is configured to be approximately the same height as the fin tubes 18 in each block, and work can be performed from the manhole 15. The person 11 can enter the scaffold 12 and work. For example, the worker 11 goes up to the uppermost stage of the scaffold 12, holds the nozzle (foreign matter removing tool) 14 of the present invention, inserts it into the gap between the fin tubes 18, and cleans the accumulated ash (foreign matter) 13 with cleaning air (compressed) Air) 10 is ejected from the nozzle 14 and removed.

  Fig.3 (a) is a block diagram of the foreign material removal tool which concerns on the 1st Embodiment of this invention. The foreign matter removing tool 110 includes a tube body 21 that conveys compressed air having a predetermined pressure, and a nozzle 20 that is provided at the tip of the tube body 21 and that injects compressed air. The nozzle 20 includes at least one nozzle. The injection port 26 is provided, and the injection port 26 is configured so that the injection direction 28 is at a predetermined angle (β) with respect to the axis 27 of the tube body 20 (see FIG. 3B). Further, on the opposite side to the nozzle 20 provided at the tip of the tube body 21, a cock 22 for supplying compressed air to the tube body 21 and operating a valve for stopping is attached, and air is introduced at the inlet thereof. A supply hose 23 is attached.

In other words, the foreign matter removing tool 110 according to the present embodiment includes the tube body 21 and the nozzle 20 attached to the tip of the tube body 21. The nozzle 20 includes at least one injection port 26, and the injection port 26 is configured such that the injection direction of the compressed air is shifted by a predetermined angle (β) with respect to the axial direction 27 of the tube body 21. As a result, even when the fin tubes (objects to be cleaned) 18 are arranged in the depth direction and the entire angle cannot be moved up and down, the nozzle 20 is simply moved along the fin tube 18. It is possible to efficiently remove foreign matter adhering in a direction different from the direction in which the can be inserted into the gap.
Further, if the nozzle 26 provided in the nozzle 20 is the same as the axial direction 27 of the tube body 21, the cleaning ability is not so high. That is, when the fin tubes 18 are arranged in the depth direction and the entire angle cannot be moved up and down, the angle of the tip of the nozzle 20 cannot be changed too much, so that the cleaning range is limited. Therefore, in the present embodiment, the injection port is configured so that the injection direction is approximately 45 degrees with respect to the axial direction of the tubular body. Thereby, compressed air can be sprayed over a wide range with respect to the fin tube 18.

FIG. 4 is a configuration diagram of the foreign matter removing tool according to the second embodiment of the present invention. The same constituent elements will be described with the same reference numerals as in FIG. This foreign matter removing tool 120 is provided with at least one injection port 24 at an appropriate position of the tube body 21 in FIG. 3A. For example, when there are two or more injection holes 24 as shown in FIG. The predetermined interval is set. For example, you may make it become equal to the space | interval d of the fin tube 18 of the waste heat recovery heat exchanger of FIG.
That is, in the present embodiment, the compressed air injection port is provided not only at the tip 26 but also at a suitable place 24 of the tube body 21. Thereby, when the fin tubes 18 are arranged in the depth direction, not only the foreign matter is removed while the nozzle 20 is inserted into the fin tube 18, but also the compressed air injected from the injection port 24 of the tube body 21 after the insertion. The remaining foreign matter can be further removed.

FIG. 5 is a configuration diagram of the foreign matter removing tool according to the third embodiment of the present invention. The same constituent elements will be described with the same reference numerals as in FIG. The foreign material removing tool 130 includes a tube body 21 that conveys compressed air having a predetermined pressure, the distal end of the tube body 21 is blocked by a closing member 25, and at least one injection port 24 is disposed at an appropriate location excluding the blocking member 25. It is equipped with. In the figure, the four injection holes are provided, but the number may be more or less.
That is, when cleaning the fin tube 18 having a deep depth direction, the necessity of the nozzle 20 at the tip is low. Therefore, in the present embodiment, the distal end of the tube body 21 is closed with the closing member 25, and the injection port 24 is provided at an appropriate position of the tube body 21. At this time, by making the interval between the injection ports 24 equal to the interval d between the fin tubes 18, it is possible to remove foreign matters attached to a wide range of the fin tubes 18 by one insertion.

FIG. 6 is a configuration diagram of a foreign matter removing tool according to the fourth embodiment of the present invention. FIG. 6A shows a case where the entire tubular body 21 is extended, and FIG. 6B shows a case where the entire tubular body 21 is contracted. The same constituent elements will be described with the same reference numerals as in FIG. This foreign matter removing tool 140 is configured such that the tubular body is extendable and retractable. For example, as shown in FIG. 6A, when the tube body 21 is configured by three portions (21a to 21c) and each has a diameter that can be inserted into each other, by extending in the direction of the arrow A, the fin 21 The tube body can be set according to the depth of the tube 18. Further, when the foreign matter removal is completed and the foreign matter removing tool 140 is accommodated, the three portions (21a to 21c) can be accommodated as shown in FIG.
That is, when the length of the tube body is fixed in accordance with the depth of the fin tube 18, it is not possible to cope with a case where the length is longer than that. Therefore, in the present embodiment, by configuring the tube body 21 to be extendable and contractible, the depth of the fin tube 18 can be flexibly accommodated.

FIG. 7 is an example of a nozzle cross-sectional view of the present invention. In this example, the injection ports 26 are provided at four locations around the nozzle 20. In this case, the straight line connecting the injection ports (26 a to 26 d) is arranged so as to be orthogonal to the axis 27 of the tube body 21.
That is, when the fin tubes 18 are arranged in the depth direction and are located above and below, the nozzle 20 is inserted between them to perform cleaning. At this time, it is preferable that at least two injection ports 26 of the nozzle 20 are provided so that the positions thereof face each other. As a result, the foreign matter in the upper and lower fin tubes 18 can be removed simultaneously by inserting the nozzle 20 once.
Further, at least two injection ports 24 may be provided around the tube body 21, and a straight line connecting the injection ports 24 may be arranged so as to be orthogonal to the axis 27 of the tube body 21 (see FIG. 2). In this case, when the fin tubes 18 are arranged in the depth direction and are located above and below, the tube body 21 is inserted between them to perform cleaning. At this time, it is preferable that at least two injection ports 24 of the tubular body 21 are provided and disposed so as to face each other. Thereby, the foreign substance of the fin tube 18 in the upper and lower sides can be removed simultaneously by inserting the tube body 21 once.

FIG. 8 is a cross-sectional view of a nozzle according to another embodiment of the present invention. In the present embodiment, a propeller (rotation mechanism) 32 is provided in a part of the nozzle 30, and when the compressed air is supplied, the part 30 of the nozzle having the injection port 31 is rotated by the propeller 32 about the shaft 33 as a fulcrum. It is. The propeller 32 is fixed to a part 30 of the nozzle by points 43 and 44.
That is, when the arrangement of the injection ports 31 of the part 30 of the nozzle is fixed, the compressed air cannot be injected to all foreign matters as it is. If the foreign object can be visually recognized, the injection port 31 can be directed in that direction. However, if the foreign object cannot be visually recognized, a place where the foreign object cannot be completely removed is generated. Therefore, in the present embodiment, when a part of the nozzle 30 having the injection port 31 is configured to be rotatable, and compressed air is supplied, the part 30 of the nozzle is rotated by the propeller 32 by the wind pressure, and all the surroundings are rotated. Compressed air is injected into Thereby, compressed air can be efficiently applied to the fin tube 18.

FIG. 9 is a cross-sectional view of a nozzle according to another embodiment of the present invention. In the present embodiment, the nozzle 36 is provided with a pressure valve 38, and when compressed air is supplied, the spring 37 is set so that the pressure valve 38 is opened when the pressure is higher than a predetermined pressure. Is to inject.
That is, there are foreign matters that can be removed even with the same wind pressure and foreign matters that cannot be removed. Although it is possible to remove foreign matter that cannot be removed by increasing the wind pressure, there is a limit to this. Therefore, in the present embodiment, compressed air is compressed as much as possible, and when it reaches a certain pressure or higher, it is injected at a stretch. Thereby, the foreign matter can be removed at a pressure higher than the continuous injection pressure.

FIG. 10 is a diagram showing a cross-sectional shape of the nozzle outlet. The cross-sectional shape of the injection port 41 provided in the nozzle 42 is formed in a tapered shape whose diameter becomes narrower toward the injection direction 43 of compressed air.
That is, the speed (wind speed) of compressed air increases as the area of the tube through which it flows is reduced. Therefore, in the present embodiment, the cross-sectional shape of the injection port 41 is formed in a tapered shape whose diameter becomes narrower toward the injection direction 43 of compressed air, thereby removing foreign matters with a strong injection force.

  Moreover, when the fin tube 18 is high temperature, if low temperature compressed air is injected there, the fin tube 18 may contract rapidly due to a temperature difference, resulting in metal breakage. Therefore, it is important that there is no significant difference between the compressed air and the temperature of the fin tube 18. Therefore, in this embodiment, the compressed air is heated to a predetermined temperature and supplied to the pipe body. Thereby, damage to the fin tube 18 can be prevented in advance. A means for heating the compressed air may be provided in front of the cock 22.

1 is an overall configuration diagram of an exhaust heat recovery heat exchanger provided in a thermal power plant. It is the figure which modeled a mode that the foreign material deposited on the waste heat recovery heat exchanger was removed. (A) is a block diagram of the foreign substance removal tool which concerns on the 1st Embodiment of this invention, (b) comprises an injection port so that an injection direction may become a predetermined angle ((beta)) with respect to the axis | shaft of a tubular body. FIG. It is a block diagram of the foreign material removal tool which concerns on the 2nd Embodiment of this invention. It is a block diagram of the foreign material removal tool which concerns on the 3rd Embodiment of this invention. (A) and (b) are the block diagrams of the foreign material removal tool which concerns on the 4th Embodiment of this invention. It is nozzle sectional drawing (an example) of this invention. It is sectional drawing of the nozzle which concerns on other embodiment of this invention. It is sectional drawing of the nozzle which concerns on other embodiment of this invention. It is a figure which shows the cross-sectional shape of a nozzle injection port.

Explanation of symbols

  1 Gas Turbine, 2 Duct, 3 High Temperature Waste Heat Recovery Heat Exchanger, 4 Hopper, 5 Denitration Equipment, 6 Duct, 7 Waste Heat Recovery Heat Exchanger, 8 Hopper, 20 Nozzle, 21 Tube, 22 Cock, 23 Air Supply Hose, 24 injection port, 25 blocking member, 26 injection port, 27 tube axis, 110 foreign matter removal tool

Claims (4)

A foreign matter removing tool for removing foreign matter accumulated on a fin tube of an exhaust heat recovery heat exchanger arranged at a predetermined interval in the depth direction ,
A tubular body that conveys compressed air having a predetermined pressure; a nozzle that is provided at a distal end of the tubular body to inject the compressed air; and a rotating mechanism that rotates a part of the nozzle when the compressed air is supplied. And comprising
The tubular body includes a plurality of injection ports arranged at intervals equivalent to the arrangement interval of the fin tubes in the longitudinal direction,
The nozzle has an air jet direction of the compressed air of approximately 45 degrees with respect to the axial direction of the tubular body, and a cross-sectional shape of the nozzle is a tapered shape whose diameter decreases toward the air jet direction of the compressed air. A foreign matter removing tool comprising two injection ports, and a straight line connecting the injection ports is orthogonal to the axis of the tubular body . The foreign matter removing tool according to claim 1 , wherein the tubular body is configured to be stretchable. Comprising at least two injection openings around the tube, foreign matter removal device according to claim 1 or 2 straight lines connecting the respective injection ports and said and Turkey be perpendicular to the axis of the tubular body . The foreign matter removing tool according to any one of claims 1 to 3 , further comprising heating means for heating the compressed air .

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