JP7137660B1 - Deposit removing device and deposit removing method - Google Patents

Abstract

Kind Code: A1 A state in which it is possible to expand the range of selection of materials that can be used as a constituent material of a sealing body, and to emit a pressure wave to a location where deposits need to be removed at the timing when the deposits need to be removed. To provide a deposit removing device capable of easily A deposit removing device (20) for removing dust adhering to a heat transfer tube (4) by using a pressure wave, comprising a container (30) having an opening, and a container (30) provided corresponding to the opening. A lid body having a plurality of communicating injection ports, a sealing body 80 closing the injection ports, and fixing means for detachably fixing the sealing body 80 are provided. It is configured to break the body 80 to generate pressure waves. [Selection drawing] Fig. 1

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deposit removing device and a deposit removing method for removing deposits adhering to an object using pressure waves.

In recent years, it has become important to improve the amount of power generated in a waste incineration facility that is equipped with a power generation facility. Power generation at a combustion facility involves recovering heat in a boiler from the high-temperature exhaust gas generated by the combustion of waste, etc. in the combustion furnace, generating steam at a specified temperature and pressure, and introducing it to the turbine generator. It is done by

The boiler has a radiant chamber and a convective heat transfer chamber. A radiant heat transfer tube is arranged as a radiant heat transfer surface in the radiant chamber, and a superheater is arranged as a convective heat transfer surface in the convective heat transfer chamber. The superheater is configured by arranging a plurality of heat transfer tubes (superheating tubes) in a horizontal direction in a plurality of stages in a height direction.

Exhaust gas from a combustion furnace contains dust containing corrosive components and heavy metals. For this reason, as the operation progresses, dust gradually adheres and accumulates on the heat transfer tubes of the boiler's radiant heat transfer surface and convection heat transfer surface, reducing heat recovery performance, clogging gas flow paths, and corroding heat transfer tubes. Such a failure may be caused, and it may become difficult to continue normal operation.

Therefore, it is possible to continuously operate the boiler normally by removing the dust adhering to the heat transfer tubes using a deposit removing device that removes deposits using pressure waves (for example, , see Patent Document 1).

A deposit removal device according to Patent Document 1 includes a pressure container having an opening and a closing body that closes the opening, and is a gaseous fuel containing an oxidant supplied into the pressure container via a supply line. The explosion is configured to generate a pressure wave.

WO2007/028264

In the deposit removing device according to Patent Document 1, the pressure inside the pressure vessel increases as the fuel is supplied into the pressure vessel. At this time, the pressure inside the pressure vessel acts on the entire portion of the closure corresponding to the opening of the pressure vessel. Therefore, if a material with low tensile strength is used as a material for the closure (sealing body), the sealing body will break before the fuel is completely filled into the pressure vessel, and the fuel will be released. There is a risk that it will not reach the point of causing an explosion. In order to avoid such a situation, it is generally necessary to use a material with high tensile strength as the constituent material of the encapsulant. Become.

For example, if the stress acting on the encapsulant is suppressed by increasing the thickness of the encapsulant, it may be possible to use a material that generally has low tensile strength as a constituent material of the encapsulant. be. However, increasing the thickness of the sealing body increases the size of the means for holding the state where the sealing body is disposed in the pressure container, which in turn leads to an increase in the size of the entire apparatus.

In this type of deposit removing device, if the size of the entire device is increased, it becomes difficult to handle when carrying the device, when mounting the device, or when replacing the sealing member. At the timing, it becomes difficult to make it possible to emit a pressure wave to the point where deposit removal is required.

The present invention has been made in view of the above problems, and can widen the range of selection of materials that can be used as the constituent material of the sealing body, and at the timing when the removal of the deposits is necessary. An object of the present invention is to provide a deposit removing device and a deposit removing method that can easily put a pressure wave into a state in which a pressure wave can be emitted to a place where a pressure wave is required.

The characteristic configuration of the deposit removing device according to the present invention for solving the above problems is as follows:
A deposit removing device for removing deposits adhering to an object using pressure waves,
a container having an opening;
a cover provided corresponding to the opening and having a plurality of injection ports leading into the container;
a sealing body that closes the injection port;
fixing means for detachably fixing the sealing body;
with
It is configured such that the pressure wave is generated by breaking the sealing body by increasing the pressure in the container.

According to the deposit removing device of this configuration, it is provided with a container having an opening and a lid body corresponding to the opening of the container. The lid has a plurality of injection ports leading into the container. Before the pressure waves are generated, the plurality of injection ports are closed by the sealing body. In the deposit removing device of this configuration, when generating a pressure wave, for example, when a combustion gas or a compressed gas is supplied into the container, as the combustion gas or the like is supplied into the container, The pressure inside the container increases. At this time, the sealing body is supported by a portion of the lid around the plurality of injection ports. Therefore, the area on which the pressure acts on the sealing body is reduced, and the stress acting on the sealing body can be suppressed. Therefore, not only metal materials generally having high tensile strength but also non-metallic materials generally having low tensile strength can be used as the constituent materials of the sealing body. It is possible to expand the range of selection of materials that can be used as materials. In addition, according to the attached matter removing apparatus of this configuration, as described above, since the stress acting on the sealing body can be suppressed, the thickness of the sealing body can be reduced, and the fixing for fixing the sealing body can be reduced. The means can be miniaturized, and the miniaturization of the entire device can be achieved. Furthermore, the sealing body can be attached and detached by a predetermined operation on the fixing means. Therefore, the sealing body can be easily replaced. In this way, the miniaturization of the device as a whole makes it excellent in portability, and since the sealing body can be easily replaced, it is possible to emit a pressure wave to the location where the adhering matter needs to be removed at the timing when the adhering matter needs to be removed. Able to be easily in condition.

In the deposit removing device according to the present invention,
The lid includes a first lid portion and a second lid portion that are arranged to face each other,
It is preferable that the sealing member is sandwiched between the first lid portion and the second lid portion.

According to the attached matter removing device of this configuration, the sealing body is sandwiched between the portions around the plurality of injection ports in the first lid portion and the portions around the plurality of injection ports in the second lid portion. be As a result, the sealing body is more stably supported by the first lid portion and the second lid portion. Therefore, when a combustion gas or the like is supplied into the container, local deformation of the sealing body can be more reliably suppressed, and the range of selection of materials that can be used as a constituent material of the sealing body can be increased. The thickness of the sealing body can be made smaller while being able to spread.

In the deposit removing device according to the present invention,
It is preferable to further include a nozzle body that communicates with the inside of the container through the injection port.

According to the deposit removing device of this configuration, the nozzle body, which communicates with the interior of the container through the plurality of jetting ports, reliably determines the discharge direction of the pressure waves emitted through the plurality of jetting ports in the opening direction of the nozzle body. be able to. Therefore, by aiming the nozzle body at the target object of deposit removal, the deposit can be removed more reliably.

In the deposit removing device according to the present invention,
It is preferable that the sealing body is composed of a combustible laminate including a sealing layer and a shape-retaining layer.

According to the attached matter removing device of this configuration, the sealing body is composed of a laminate including the sealing layer and the shape-retaining layer. With such a configuration, even if the pressure inside the container increases as the combustion gas is supplied into the container, the seal layer can reliably prevent the combustion gas from leaking. Deformation can be suppressed by the shape maintaining layer to maintain the function as a sealing layer. Therefore, when the container is filled with combustion gas or the like, the plurality of injection ports can be reliably closed by the sealing member without leakage. Moreover, the laminate is made of a combustible material. As a result, for example, when the deposit removing device is attached to the boiler, fragments of the sealing body destroyed when the pressure wave is generated are burned by the heat in the boiler. Therefore, a protector or the like for protecting the heat transfer tube group of the boiler from fragments of the broken sealing body becomes unnecessary, and the broken seal is placed in the collection line for deposits removed from the heat transfer tube group of the boiler by the pressure wave. It is possible to prevent fragments of the stopper from being mixed in.

In the deposit removing device according to the present invention,
It is preferable that the ratio (S ₁ /S ₂ ) of the opening area (S ₁ ) of the injection port and the opening area (S ₂ ) of the opening is 0.3 to 0.7.

According to the deposit removing device of this configuration, the _{ratio (} S ₁ /S ₂ ) is set to 0.3 to 0.7. As a result, the stress acting on the sealing body can be reliably suppressed while ensuring the power of the pressure wave necessary for removing the deposit.

Next, the characteristic configuration of the deposit removal method according to the present invention for solving the above problems is as follows:
A deposit removal method for removing deposits adhering to an object using pressure waves,
an installation step of installing any one of the attachment removing devices described above in a state capable of emitting pressure waves to an object;
a gas filling step of filling the container with a combustible gas and an oxidant gas;
an ignition step of igniting the mixed gas of the combustible gas and the oxidant gas filled in the container;
to include

According to the deposit removal method of this configuration, the object is installed in a state capable of emitting pressure waves (installation step), the container is filled with the combustible gas and the oxidant gas (gas filling step), A mixed gas of combustible gas and oxidant gas filled in the container is ignited (ignition step). When the mixed gas in the container ignites in the ignition process, combustion and explosion occur inside the container, the pressure inside the container rises sharply, and the sealed body that cannot withstand the pressure is destroyed. When the sealing body is destroyed, the pressure is released suddenly by jetting out high-pressure gas from the plurality of injection ports of the lid. As a result of the rapid release of the pressure, a pressure wave is generated, and the adhering matter adhering to the object is removed by the wind pressure and vibration caused by the pressure wave. The attached matter removing apparatus used in the attached matter removing method of this configuration is excellent in portability due to the miniaturization of the entire apparatus, and the sealing body can be easily replaced. Therefore, according to the deposit removal method of this configuration, it is possible to easily perform the installation step of installing the device in a state where the pressure wave can be emitted to the location where the deposit needs to be removed at the timing when the deposit needs to be removed. .

FIG. 1 is a diagram showing a state in which a deposit removing apparatus according to an embodiment of the present invention is installed in a boiler in a state capable of emitting pressure waves to heat transfer tubes. 2(a) is an enlarged vertical cross-sectional view of the X portion of FIG. 1, and FIG. 2(b) is an enlarged vertical cross-sectional view of the Y portion of FIG. 3(a) is a view taken along line AA in FIG. 2(a), FIG. 3(b) is a view taken along line BB in FIG. 2(a), and FIG. ) is a view taken along line CC of FIG. 2(a), and FIG. 3(d) is a view taken along line DD of FIG. FIG. 4 is an explanatory diagram of the arrangement of a plurality of injection ports provided in the first lid portion and the second lid portion. FIG. 5 shows a sealing body, (a) is a front view seen from the line EE in FIG. 2(a), and (b) is a cross-sectional view along the line FF in (a). FIG. 6 is a schematic diagram for explaining the schematic configuration of gas supply means and a control system provided in the deposit removing apparatus according to one embodiment of the present invention. FIG. 7 is an explanatory view of the mounting operation of the pressure gun in the installation process of the deposit removing method using the deposit removing device. FIG. 8 is an explanatory diagram of the filling process in the deposit removing method using the deposit removing apparatus. FIG. 9 is an explanatory diagram of the ignition step in the deposit removing method using the deposit removing apparatus. FIG. 10 is an explanatory view of another aspect of the mounting operation of the pressure gun in the installation process of the deposit removing method using the deposit removing device.

The present invention will be described below with reference to the drawings. In the following embodiments, an object to be removed is a heat transfer tube of a boiler, and an apparatus and method for removing dust adhering to the heat transfer tube will be described as an example. However, the present invention is not intended to be limited to the embodiments described below or the configurations described in the drawings.

<Overall description>
FIG. 1 is a diagram showing a state in which a deposit removing device 20 according to an embodiment of the present invention is installed in a boiler 1 in a state capable of emitting pressure waves to heat transfer tubes 4 . As shown in FIG. 1 , the deposit removing device 20 is arranged outside the side wall 3 forming the exhaust gas flow path 2 of the boiler 1 . In the exhaust gas flow path 2, a plurality of heat transfer tube groups 5 and 6 are arranged in which a plurality of heat transfer tubes 4 arranged in the horizontal direction are provided in a plurality of stages in the vertical direction of the boiler 1 (in FIG. 1, two Only heat transfer tube groups 5 and 6 are shown.). The heat transfer tubes 4 constituting the heat transfer tube groups 5 and 6 are objects to which deposits (dust) adhere. A space of a predetermined size is provided between the upper heat transfer tube group 5 and the lower heat transfer tube group 6, and a connection duct 15 as a conduit connected to the side wall 3 in communication with this space is provided on the side wall 3. projecting outward from the The connection duct 15 is composed of a cylindrical body portion 15a projecting outward from the side wall 3 and an outward duct flange portion 15b integrally provided at the projecting end of the body portion 15a.

<Composition of the pressure gun>
The deposit removing device 20 has a pressure gun 25 . The pressure cannon 25 is mainly composed of a container 30 , a nozzle body 50 , and a sealing body 80 interposed between the container 30 and the nozzle body 50 .

<Container>
FIG. 2(a) is an enlarged vertical cross-sectional view of the X portion of FIG. As shown in FIG. 2( a ), the container 30 includes a small diameter cylindrical portion 31 , a truncated conical portion 32 whose diameter gradually decreases in the direction (forward) toward the side wall 3 , and a small diameter cylindrical portion 32 . and a large-diameter cylindrical portion 33 having a diameter larger than that of the portion 31 . In the container 30, a large-diameter cylindrical portion 33, a frusto-conical cylindrical portion 32, and a small-diameter cylindrical portion 31 are arranged in this order toward the front (direction from right to left in FIG. 2(a)). there is These cylindrical portions 31, 32, and 33 are integrally connected with their axes (tube axes) aligned with each other. Here, a disk-shaped container-side end plate portion 35 is integrally provided on the front end side of the small-diameter cylindrical portion 31 . In the following description, unless otherwise specified, the tube axis direction is the direction in which the axis (tube axis) of the container 30 extends.

FIG. 2(b) is an enlarged vertical cross-sectional view of the Y portion of FIG. A rear end side of the large-diameter cylindrical portion 33 is closed by an end wall portion 40 . A glow plug 42 is attached to the end wall portion 40 via a plug protection member 41 . In such a configuration, by energizing the glow plug 42, the later-described combustion gas (mixed gas of methane gas and oxygen gas) supplied and filled inside the container 30 can be ignited. Moreover, most of the pressure waves generated by the combustion and explosion of the combustion gas are blocked by the plug protection member 41, so that the glow plugs 42 can be protected and the life of the glow plugs 42 can be greatly extended. . Further, a pipe connector 43 is attached to the end wall portion 40 so as to communicate with the inside of the container 30 .

<Nozzle body>
As shown in FIG. 2( a ), the nozzle body 50 includes a small diameter cylindrical portion 51 , an inverted truncated conical portion 52 whose diameter gradually increases as it advances forward, and a diameter larger than that of the small diameter cylindrical portion 51 . and a large-diameter cylindrical portion 53 having a large diameter. In the nozzle body 50, a small-diameter cylindrical portion 51, an inverted frusto-conical cylindrical portion 52, and a large-diameter cylindrical portion 53 are arranged in this order toward the front. These cylindrical portions 51, 52, 53 are integrally connected with their axes (tube axes) aligned.

In the nozzle body 50, a disk-shaped nozzle-side end plate portion 55 having approximately the same area as the container-side end plate portion 35 is integrally provided on the rear end side of the small-diameter cylindrical portion 51. . The small-diameter cylindrical portion 51 is integrally provided with an intermediate flange portion 65 protruding outward from the outer peripheral surface thereof so as to be positioned in the vicinity of the inverted truncated cone cylindrical portion 52 . Between the nozzle-side end plate portion 55 and the intermediate flange portion 65, a plurality of (four in this example) plate-like reinforcing ribs 71 are arranged at equal angles in the circumferential direction of the small-diameter cylindrical portion 51 (in this example, every 90°). The reinforcing rib 71 is integrally joined to the outer peripheral surface of the small-diameter cylindrical portion 51 , the nozzle-side end plate portion 55 and the intermediate flange portion 65 .

On the outer peripheral surface side of the small-diameter cylindrical portion 51, a blow-off pipe 63 formed of a cylindrical member extending in a direction orthogonal to the pipe axis of the small-diameter cylindrical portion 51 communicates with the inside of the small-diameter cylindrical portion 51. Attached with. One end of the blowout pipe 63 is joined to the outer peripheral surface of the small-diameter cylindrical portion 51 at an intermediate position in the front-rear direction of the small-diameter cylindrical portion 51 . The other end of the blow-out pipe 63 is connected to a compressed gas supply source via a pipe (not shown), a flow control valve, or the like. The blowout pipe 63 supplies a purge gas (for example, compressed air) from a compressed gas supply source against flying objects including dust flying toward a plurality of injection ports 37 and 57, which are pressure wave emission ports, to be described later. It functions as a barge means that blows out and barges the flying object.

3(a) is a view taken along line AA in FIG. 2(a), FIG. 3(b) is a view taken along line BB in FIG. 2(a), and FIG. ) is a view taken along line CC of FIG. 2(a), and FIG. 3(d) is a view taken along line DD of FIG. 2(a). As shown in FIG. 3(a), the container-side end plate portion 35 includes a lid portion 35a (hereinafter referred to as "first lid portion 35a") formed in a central circular area having a predetermined diameter. , and a container-side flange portion 35b integrally formed on the outer peripheral side of the first lid portion 35a. As shown in FIG. 3B, the nozzle-side end plate portion 55 includes a lid portion 55a (hereinafter referred to as a “second lid portion 55a”) formed in a central circular area having a predetermined diameter. , and a nozzle-side flange portion 55b integrally formed on the outer peripheral side of the second lid portion 55a.

<Lid body>
As shown in FIG. 2( a ), in the deposit removing device 20 , the lid 75 provided corresponding to the opening 31 a of the small-diameter cylindrical portion 31 , which is the substantial opening of the container 30 , is the first It is composed of a lid portion 35a and a second lid portion 55a.

<First lid part>
As shown in FIGS. 2(a) and 3(a), the first lid portion 35a is attached to the opening 31a of the small-diameter cylindrical portion 31 of the container 30 so as to block the open end of the small-diameter cylindrical portion 31. are provided accordingly. The first lid portion 35 a has a plurality of (19 in this example) injection port portions 37 leading into the container 30 . Each of the plurality of injection port portions 37 is formed in the shape of a round hole having a circular cross section penetrating through the first lid portion 35a.

As shown in FIG. 3A, an O-ring groove 38 is formed in the front surface of the first lid portion 35a so as to surround all of the plurality of injection port portions 37 in an annular shape. An O-ring 45 is fitted in the O-ring groove 38 .

<Second lid portion>
As shown in FIGS. 2(a) and 3(b), the second lid portion 55a covers the opening 51a of the small-diameter cylindrical portion 51 of the nozzle body 50 so as to cover the open end of the small-diameter cylindrical portion 51. are provided corresponding to The second lid portion 55a has a plurality of (19 in this example) injection port portions 57 similarly to the first lid portion 35a. The plurality of injection port portions 37 provided in the first lid portion 35a and the plurality of injection port portions 57 provided in the second lid portion 55a are arranged so as to overlap each other when viewed in the pipe axial direction (front-rear direction). are placed. Therefore, the plurality of injection port portions 37 and 57 provided in the first lid portion 35 a and the second lid portion 55 a communicate with the inside of the container 30 .

In the attached matter removing device 20 of the present embodiment, the portions around the plurality of injection port portions 37 in the first lid portion 35a and the portions around the plurality of injection port portions 57 in the second lid portion 55a A sealing body 80 is sandwiched. Thereby, the sealing body 80 is supported more stably. Therefore, local deformation of the sealing body 80 can be more reliably suppressed when the combustion gas is supplied into the container 30 . In this way, it is possible to widen the selection range of materials that can be used as the constituent material of the sealing body 80, and to further reduce the thickness of the sealing body 80. FIG.

<Arrangement of multiple injection ports>
FIG. 4 is an explanatory diagram of the arrangement of a plurality of injection port portions 37, 57 provided in the first lid portion 35a and the second lid portion 55a. As shown in FIG. 4, the plurality of injection port portions 37 are arranged so as to be concentrically and regularly arranged. That is, one injection port 37 is arranged in the center of the first lid portion 35a, and six injection port portions 37 are arranged at equal angles ( 60°), the center of _each injection port portion 37 is aligned with the circumference CR1 of the _first pitch circle diameter D1 based on the center of the injection port portion 37 arranged in the center. Furthermore, around the six injection ports 37, 12 injection ports 37 are arranged at equal angles (every 30°) with the center of each injection port 37 arranged at the center. 37 is arranged so as to coincide with the circumference CR ₂ of the second pitch diameter D ₂ (D ₁ <D ₂ ). The arrangement of the plurality of injection port portions 57 provided on the second lid portion 55a is also the same as the arrangement of the plurality of injection port portions 37 provided on the first lid portion 35a.

<Opening area ratio between a plurality of injection ports and the opening of the container>
In the present embodiment, the opening area (S ₁ ) obtained by summing the opening areas of all of the plurality (19) injection ports 37 and the opening area (S ₂ ) of the opening 31a of the small-diameter cylindrical portion 31 of the container 30 (S ₁ /S ₂ ) is preferably 0.3 to 0.7, more preferably 0.4 to 0.6. As a result, the stress acting on the sealing body 80 can be reliably suppressed while ensuring the power of the pressure wave necessary for removing the deposits. If the ratio (S ₁ /S ₂ ) is less than 0.3, it will be difficult to ensure the power of the pressure wave necessary to remove the deposits. If the ratio (S ₁ /S ₂ ) exceeds 0.7, the stress acting on the sealing body 80 cannot be sufficiently suppressed, and the sealing is completed before the filling of the combustion gas into the container 30 is completed. There is a risk that the stopper 80 will break. It should be noted that the total opening area (S ₁₁ ) of all the opening areas of the plurality (nineteen) of the injection port portions 57 and the opening area (S ₁₂ ) of the opening portion 51a of the small-diameter cylindrical portion 51 of the nozzle body 50 The ratio (S ₁₁ /S ₁₂ ) is also preferably 0.3 to 0.7, more preferably 0.4 to 0.6, like the above ratio (S ₁ /S ₂ ). is.

As shown in FIG. 3( a ), the container-side flange portion 35 b of the container-side end plate portion 35 has a plurality of (eight in this example) bolt insertion holes 47 arranged at equal angles (every 45°) in the circumferential direction. is formed to be placed in the As shown in FIG. 3B, bolt insertion holes 67 are formed in the nozzle-side flange portion 55b of the nozzle-side end plate portion 55 so as to correspond to the respective bolt insertion holes 47 formed in the container-side flange portion 35b. is formed. As shown in FIG. 3(c), a plurality of (eight in this example) bolt insertion holes 17 are arranged in the duct flange portion 15b of the connection duct 15 at equal angular intervals (every 45°) in the circumferential direction. is formed as As shown in FIG. 3D, the intermediate flange portion 65 is formed with bolt insertion holes 77 corresponding to the bolt insertion holes 17 formed in the duct flange portion 15b.

<Encapsulation body>
5 shows the sealing body 80, (a) is a front view seen from the line EE in FIG. 2(a), and (b) is a cross-sectional view along the line FF in (a). As shown in FIGS. 5A and 5B, the sealing body 80 is a circular shape having a predetermined thickness and having approximately the same area as the container-side end plate portion 35 and the nozzle-side end plate portion 55. It is made of a plate-like body and can close the plurality of injection port portions 37 provided in the first lid portion 35a and the plurality of injection port portions 57 provided in the second lid portion 55a. Bolt insertion holes 87 are formed in the vicinity of the outer periphery of the sealing body 80 so as to correspond to the respective bolt insertion holes 47 (bolt insertion holes 67) formed in the container-side flange portion 35b (nozzle-side flange portion 55b). formed.

As shown in the partially enlarged view of FIG. 5B, the sealing body 80 has a sealing layer 80a and a shape maintaining layer 80b. It is configured by being laminated in the thickness direction. The sealing layer 80a is a layer for providing airtightness so that the combustion gas does not leak even if the pressure inside the container 30 increases as the combustion gas is supplied into the container 30. For example, It consists of a sheet made of a resin material such as polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyethylene terephthalate. The shape maintaining layer 80b is a layer provided at a position adjacent to the sealing layer 80a to maintain the shape of the sealing layer 80a, and is made of, for example, a sheet made of paper, nonwoven fabric, or the like. The sealing body 80 is manufactured, for example, by sandwiching a sheet made of paper, nonwoven fabric, etc. and a sheet made of a thermoplastic resin between a pair of pinch rolls while applying heat to integrally join them.

The sealing body has the first lid portion 35a and the second lid portion 55a in contact with the first lid portion 35a on the side of the seal layer 80a and the second lid portion 55a on the side of the shape maintaining layer 80b. 55a with its plate surface directed in the direction of the tube axis. In this way, even if the pressure inside the container 30 increases as the combustion gas is supplied into the container 30, the seal layer 80a can reliably prevent the combustion gas from leaking and prevent deformation of the seal layer 80a. The function of the sealing layer 80a can be maintained by suppressing it with the shape maintaining layer 80b. Therefore, when the container 30 is filled with combustion gas, the plurality of injection ports 37 and 57 can be reliably closed by the sealing member. Also, the sealing body 80 is made of a combustible material. As a result, fragments of the sealing body 80 that are destroyed and blown into the boiler 1 when the pressure wave is generated are burned by the heat inside the boiler 1 . Therefore, a protector or the like for protecting the heat transfer tube groups 5 and 6 of the boiler 1 from fragments of the sealing body 80 that are broken and blown into the boiler 1 when the pressure wave is generated becomes unnecessary. It is possible to prevent fragments of the sealing body 80 from being mixed into the recovery line for deposits removed from the heat transfer tube groups 5 and 6.

As shown in FIG. 2( a ), the sealing body 80 is interposed between the container-side end plate portion 35 and the nozzle-side end plate portion 55 . The container-side end plate portion 35, the nozzle-side end plate portion 55, and the sealing body 80 are arranged in the longitudinal direction of the mutual bolt insertion holes 47, 67, 87 (see FIGS. 3(a) and 3(b) and FIG. 5). It is assumed that the visual positions are matched. The container-side end plate portion 35, the nozzle-side end plate portion 55, and the sealing body 80 are screwed into the bolts 91 inserted through the bolt insertion holes 47, 67, and 87 and the screw shafts of the bolts 91. It is fastened by tightening with a nut 92 that The bolt 91 and the nut 92 function as fastening means for fastening the container 30 and the nozzle body 50 with the sealing body 80 sandwiched therebetween.

<Fixing Means>
In FIG. 2(a), when the bolt 91 and nut 92 are tightened, the sealing body 80 is held between the container side end plate portion 35 (first lid portion 35a) and the nozzle side by a clamping force corresponding to the tightening force. It can be fixed in a sandwiched state with the end plate portion 55 (the second lid portion 3b). When the bolts 91 and nuts 92 are released and the bolts are removed from the container-side end plate portion 35 and the nozzle-side end plate portion 55, The encapsulant 80 can be removed. Therefore, the container-side end plate portion 35, the nozzle-side end plate portion 55, the bolt 91, and the nut 92 function as fixing means for detachably fixing the sealing body 80. FIG.

In FIG. 2(a), the connection duct 15 and the intermediate flange portion 65 are in a state where the positions of the bolt insertion holes 17 and 77 (see FIGS. 3(c) and 3(d)) are aligned when viewed in the front-rear direction. A bolt 93 inserted through the respective bolt insertion holes 17 and 77 and a nut 94 screwed onto the screw shaft of the bolt 93 are tightened. The bolt 93 and nut 94 function as fastening means for fastening the nozzle body 50 and the connection duct 15 together.

<Gas supply means>
FIG. 6 is a schematic diagram illustrating the schematic configuration of the gas supply means 100 and the control system provided in the deposit removing apparatus 20 according to one embodiment of the present invention. As shown in FIG. 6, the deposit removing apparatus 20 further includes gas supply means 100 for supplying and filling the container 30 with combustion gas such as combustible gas and oxidant gas necessary for combustion. The gas supply means 100 includes a high-pressure combustible gas cylinder 110, a high-pressure oxidant gas cylinder 120, and a valve unit .

The high-pressure combustible gas cylinder 110 shown in FIG. 6 is, for example, a gas cylinder in which a combustible gas is enclosed at a high pressure (for example, 14.7 MPa) in a pressure container, and functions as a combustible gas supply source. A pressure reducing valve 111 is attached to the high pressure combustible gas cylinder 110 . The combustible gas enclosed in the high-pressure combustible gas cylinder 110 is decompressed to, for example, 0.9 MPa by the decompression valve 111 . Examples of the combustible gas enclosed in the high-pressure combustible gas cylinder 110 include methane gas, hydrogen gas, and the like (methane gas in this example). The high-pressure combustible gas cylinder 110 is hereinafter referred to as a "methane cylinder 110".

The high-pressure oxidant gas cylinder 120 shown in FIG. 6 is, for example, a gas cylinder in which an oxidant gas is enclosed at a high pressure (for example, 14.7 MPa) in a pressure container, and functions as an oxidant gas supply source. A pressure reducing valve 121 is attached to the high pressure oxidant gas cylinder 120 . The pressure of the oxidizing gas enclosed in the high-pressure oxidizing gas cylinder 120 is reduced to, for example, 0.9 MPa by the pressure reducing valve 121 . Examples of the oxidant gas enclosed in the high-pressure oxidant gas cylinder 120 include oxygen gas and air (oxygen gas in this example). The high-pressure oxidant gas cylinder 120 is hereinafter referred to as an "oxygen cylinder 120".

The methane cylinder 110 and the oxygen cylinder 120 are placed side by side on the cylinder carrier 300 (see FIG. 1), and can be easily moved by the cylinder carrier 300 .

A valve unit 130 shown in FIG. 6 includes a methane gas supply valve 131 , an oxygen gas supply valve 132 , a gas main shutoff valve 133 , a three-way joint 134 and a pressure gauge 135 . Here, the three-way joint 134 has a first joint portion 134a, a second joint portion 134b, and a third joint portion 134c which are formed to protrude in three directions while communicating with each other. The valve unit 130 is housed in a portable storage case 310 (see FIG. 1).

In FIG. 6 , a pressure reducing valve 111 attached to a methane cylinder 110 and a methane gas supply valve 131 are connected by a first methane gas supply pipe 141 . The methane gas supply valve 131 and the first joint portion 134 a of the three-way joint 134 are connected by a second methane gas supply pipe 142 . On the other hand, the pressure reducing valve 121 attached to the oxygen cylinder 120 and the oxygen gas supply valve 132 are connected by a first oxygen gas supply pipe 151 . The oxygen gas supply valve 132 and the second joint portion 134 b of the three-way joint 134 are connected by a second oxygen gas supply pipe 152 .

The third joint portion 134 c of the three-way joint 134 and the gas main shutoff valve 133 are connected by a first supply main pipe 161 . A pressure gauge 135 is connected to the first supply main pipe 161 so as to detect pressure. The gas main shutoff valve 133 and the pipe connector 43 attached to the container 30 are connected by a second supply main pipe 162 .

<Control device>
As shown in FIG. 6, the deposit removing device 20 further includes a control device 200 mainly composed of a microcomputer capable of controlling the entire device. The control device 200 reads the measured value from the pressure gauge 135 and executes a predetermined program to control the opening/closing operations and valve opening degrees of the methane gas supply valve 131, the oxygen gas supply valve 132, and the main gas shutoff valve 133. control, and control energization to the glow plug 42 . The control device 200 is housed in a portable storage case 320 (see FIG. 1).

As shown in FIG. 1 , control device 200 and valve unit 130 are connected by cable 210 . Control device 200 and glow plug 42 are connected by cable 220 .

As shown in FIG. 6, in the deposit removing device 20, the gas supply means 100 includes combustion gas supply pipes (supply pipes 141, 142, 151, 152, supply main pipes 161, 162), and upstream opening/closing valves (methane gas supply valve 131, oxygen gas supply valve 132) respectively interposed on the upstream side and downstream side of the gas flow in the combustion gas supply line. , and a downstream side on-off valve (gas main block valve 133), and a pressure gauge 135 connected between the upstream side on-off valve and the downstream side on-off valve in the combustion gas supply line.

Then, the control device 200 that controls the methane gas supply valve 131, the oxygen gas supply valve 132, and the main gas shutoff valve 133 opens the downstream shutoff valve (main gas shutoff valve 133) to open the upstream shutoff valve. The upstream opening/closing valve is opened and closed so that the pressure value measured by the pressure gauge 135 when (the methane gas supply valve 131 and the oxygen gas supply valve 132) are closed approaches the target value, and the gas is supplied into the container 30. The methane gas supply valve 131, the oxygen gas supply valve 132, and the gas main shutoff valve 133 are controlled so that the downstream side on-off valve is closed during combustion of the combustion gas.

<Installation process>
FIG. 7 is an explanatory view of the mounting operation of the pressure gun 25 in the installation process of the deposit removing method using the deposit removing device 20. As shown in FIG. The mounting operation of the pressure cannon 25 will be described with reference to FIGS. 7(a) to 7(d).

FIG. 7(a) is a state diagram showing the pressure gun 25 carried near the boiler 1. FIG. At the timing when it is necessary to remove the dust adhering to the heat transfer tubes 4, as shown in FIG. The assembled pressure cannon 25 is transported using a cart 400, for example.

FIG. 7(b) is a state diagram just before the pressure gun 25 is inserted into the boiler 1. FIG. FIG. 7(c) is a diagram showing a state in which the pressure cannon 25 is inserted into the boiler 1. As shown in FIG. After removing the blocking plate 16 blocking the opening of the connecting duct 15 in FIG. 7(a), as shown in FIGS. The cylindrical portion 53 is inserted, and the pressure cannon 25 is pushed forward until the intermediate flange portion 65 of the nozzle body 50 hits the duct flange portion 15b of the connection duct 15 .

FIG. 7(d) is a state diagram in which the pressure cannon 25 is fastened to the boiler 1. FIG. As shown in FIG. 7(d), the intermediate flange portion 65 is abutted against the duct flange portion 15b, and the mutual bolt insertion holes 17, 77 (FIGS. 3(c) and 77) in the duct flange portion 15b and the intermediate flange portion 65 (d)) are aligned when viewed in the front-rear direction, the bolts 93 are inserted through the bolt insertion holes 17 and 77, and the nuts 94 screwed onto the screw shafts of the bolts 93 are tightened to complete the connection duct. and the pressure gun 25 are fastened. In this way, the pressure gun 25 can be attached to a portion of the boiler 1 where dust removal is required.

In addition, in the mounting work of the pressure cannon 25, an overhead crane or the like provided on the boiler 1 may be used as necessary. As a result, the pressure cannon 25 can be easily attached, and the work load can be reduced.

Then, as shown in FIG. 1, a storage case 310 in which the valve unit 130 is stored and the control device 200 are stored on a table 500 placed at a suitable location near the pressure gun 25 attached to the boiler 1. The storage cases 320 are placed respectively. Also, the valve unit 130 and the control device 200 are connected by a cable 210 , and the control device 200 and the glow plug 42 are connected by a cable 220 .

Further, the cylinder carrier 300 carries the methane cylinder 110 and the oxygen cylinder 120 to a position near the table 500 . Then, the pressure reducing valve 111 attached to the methane cylinder 110 and the methane gas supply valve 131 (see FIG. 6) are connected by the first methane gas supply pipe 141, and the pressure reducing valve 121 attached to the oxygen cylinder 120 and the oxygen gas supply valve 132 are connected. (see FIG. 6) are connected by the first oxygen gas supply pipe 151, and the gas main shutoff valve 133 (see FIG. 6) and the pipe connector 43 attached to the container 30 are connected by the second supply main pipe 162. Connecting.

Thus, the installation step of installing the deposit removing device 20 in a state capable of emitting pressure waves to the heat transfer tubes 4 of the boiler 1 is completed.

<Gas filling process>
Next, the gas filling process of filling the combustible gas and the oxidizing gas into the container 30 of the deposit removing device 20 (pressure gun 25) installed by the installation process described above will be described with reference to FIG. FIG. 8 is an explanatory view of the filling process in the deposit removing method using the deposit removing device 20. FIG. The gas filling process includes a methane gas supply process and an oxygen gas supply process. 8A to 8E schematically showing the pressure reducing valves 111 and 121, the methane gas supply valve 131, the oxygen gas supply valve 132, and the main gas shutoff valve 133. The valve open state is indicated, and the filled state indicates the valve closed state. Also, the pressure reducing valves 111 and 121 are always kept open.

[Methane gas supply process]
FIG. 8(a) is a state diagram in which the main gas shutoff valve 133 and the methane gas supply valve 131 are opened, while the oxygen gas supply valve 132 is closed. The control device 200 transmits a valve open signal to each of the main gas shutoff valve 133 and the methane gas supply valve 131 , and also transmits a valve close signal to the oxygen gas supply valve 132 . As a result, as shown in FIG. 8A, the main gas shutoff valve 133 and the methane gas supply valve 131 are opened, while the oxygen gas supply valve 132 is closed. In this case, the methane gas decompressed (for example, 0.9 MPa) from the methane cylinder 110 by the decompression valve 111 is supplied to the first methane gas supply pipe 141, the methane gas supply valve 131, the second methane gas supply pipe 142, the three-way joint 134, the first supply main pipe. 161 , gas main shutoff valve 133 , and second supply main pipe 162 into container 30 .

FIG. 8(b) is a state diagram in which the main gas shutoff valve 133 is opened while the methane gas supply valve 131 and the oxygen gas supply valve 132 are closed. After a predetermined time has elapsed, the control device 200 transmits a valve closing signal to the methane gas supply valve 131 shown in FIG. 8(a). As a result, the methane gas supply valve 131 is closed as shown in FIG. 8(b). In this way, when the main gas shutoff valve 133 is open and the methane gas supply valve 131 and the oxygen gas supply valve 132 are closed, the main gas shutoff valve 133 is open. Only the pressure from the container 30 acts on the pressure gauge 135, and the pressure inside the container 30 can be accurately measured.

Based on the measured value of the pressure gauge 135, the control device 200 determines whether the pressure inside the container 30 has reached a target value (for example, 0.2 MPa). If the measured value of the pressure gauge 135 does not reach the target value, the methane gas supply valve 131 is opened to supply methane gas into the container 30, then the methane gas supply valve 131 is closed and the pressure is measured by the pressure gauge 135. If the measured value at this time has not yet reached the target value, the operation of opening the methane gas supply valve 131 and supplying methane gas into the container 30 is repeated. When the actual pressure value in the container 30 is equal to or higher than the target value and equal to or lower than the allowable upper limit value, following the methane gas supply step, the next oxygen gas supply step is performed.

[Oxygen gas supply step]
FIG. 8(c) is a state diagram in which the main gas shutoff valve 133 and the oxygen gas supply valve 132 are opened, while the methane gas supply valve 131 is closed. The control device 200 transmits a valve open signal to each of the main gas shutoff valve 133 and the oxygen gas supply valve 132 , and also transmits a valve close signal to the methane gas supply valve 131 . As a result, as shown in FIG. 8C, the main gas shutoff valve 133 and the oxygen gas supply valve 132 are each opened, while the methane gas supply valve 131 is closed. In this case, the oxygen gas decompressed (for example, 0.9 MPa) from the oxygen cylinder 120 by the decompression valve 121 passes through the first oxygen gas supply pipe 151, the oxygen gas supply valve 132, the second oxygen gas supply pipe 152, the three-way joint 134, It is supplied into the container 30 through the first supply main pipe 161 , the gas main shutoff valve 133 and the second supply main pipe 162 .

FIG. 8(d) is a state diagram in which the main gas shutoff valve 133 is opened while the methane gas supply valve 131 and the oxygen gas supply valve 132 are closed. After a predetermined time has elapsed, the control device 200 transmits a valve closing signal to the oxygen gas supply valve 132 shown in FIG. 8(c). Thereby, the oxygen gas supply valve 132 is closed. In this way, when the main gas shutoff valve 133 is open and the methane gas supply valve 131 and the oxygen gas supply valve 132 are closed, the gas on the container 30 side due to the main gas shutoff valve 133 being open Only the pressure from the container 30 acts on the pressure gauge 135, and the pressure inside the container 30 can be accurately measured.

The control device 200 determines whether the pressure inside the container 30 has reached a target value (for example, 0.6 MPa) based on the measured value of the pressure gauge 135 . If the measured value of the pressure gauge 135 does not reach the target value, the oxygen gas supply valve 132 is opened to supply oxygen gas into the container 30 , then the oxygen gas supply valve 132 is closed and the pressure gauge 135 detects the pressure. is measured, and if the measured value at this time has not yet reached the target value, the operation of opening the oxygen gas supply valve 132 and supplying oxygen gas into the container 30 is repeated. If the actual pressure value in the container 30 is equal to or higher than the target value and equal to or lower than the allowable upper limit value, the oxygen gas supply process is terminated.

By performing the methane gas supply step, the container 30 is filled with an amount of methane gas that generates a pressure of about 0.2 MPa. Further, by performing the oxygen gas supply step, the pressure inside the container 30, which was about 0.2 MPa in the previous methane gas supply step, rises to about 0.6 MPa. A pressure-generating amount of oxygen gas is charged into container 30 . In this manner, the container 30 is filled with methane gas and oxygen gas mixed at a predetermined mixing ratio (1:2 in this example). In this way, methane gas and oxygen gas are introduced into the container 30 based on the measurement values of the pressure gauge 135 with the main gas shutoff valve 133 open and the methane gas supply valve 131 and the oxygen gas supply valve 132 closed. , the supply amounts of methane gas and oxygen gas can be accurately controlled. Since the supply amounts of methane gas and oxygen gas can be accurately controlled in this manner, the mixing ratio of methane gas and oxygen gas can be accurately adjusted, thereby accurately adjusting the power of the pressure wave. .

FIG. 8(e) is a state diagram in which the main gas shutoff valve 133, the methane gas supply valve 131, and the oxygen gas supply valve 132 are all closed. After completing the oxygen gas supply process, the control device 200 transmits a valve closing signal to the gas main shutoff valve 133 shown in FIG. 8(d). As a result, the main gas block valve 133 is closed. By closing all of the main gas block valve 133, the methane gas supply valve 131, and the oxygen gas supply valve 132 in this way, the gas charging process is completed, and the next ignition process is ready. In the ignition process, which will be described later, when the mixed gas in the container 30 is combusted, the main gas check valve 133 is closed as shown in FIG. 8(e). As a result, even if the pressure in the container 30 tries to act on the pressure gauge 135 via the second supply main pipe 162 during combustion of the mixed gas in the container 30, the gas main check valve 133 is closed and it is blocked. Therefore, the pressure gauge 135 can be protected.

<Ignition process>
An ignition process for igniting the mixed gas of the combustible gas and the oxidant gas filled in the container by the above filling process will be described with reference to FIG. FIG. 9 is an explanatory diagram of the ignition process in the deposit removing method using the deposit removing device 20. FIG.

FIG. 9(a) is a state diagram of the mixed gas in the container 30 being ignited. As shown in FIG. 9( a ), when the mixture gas in the container 30 ignites due to the temperature rise of the mixture gas by the glow plug 42 , combustion/explosion occurs inside the container 30 such that the flame propagates rapidly. The gas inside the container 30 tries to expand at once due to the temperature rise caused by the combustion.

FIG. 9(b) is a diagram showing a state in which the sealing body 80 is destroyed by the pressure inside the container 30. FIG. As shown in FIG. 9(b), the pressure inside the container 30, which is a closed space, suddenly increased, and the portions of the sealing body 80 that could no longer withstand the pressure corresponding to the plurality of injection ports 37 and 57 , destroyed to pieces. When the portions of the sealing body 80 corresponding to the plurality of injection port portions 37 and 57 are destroyed, the pressure is rapidly released by jetting out high-pressure gas from the plurality of injection port portions 37 and 57 of the lid 75 at once. be done. A pressure wave is generated as a result of the sudden release of pressure. The generated pressure wave travels toward the exhaust gas flow path 2 of the boiler 1 via the nozzle body 50 .

FIG. 9(c) is a state diagram showing pressure waves emitted into the exhaust gas flow path 2 of the boiler 1. As shown in FIG. As shown in FIG. 9(c), when pressure waves are emitted from the nozzle body 50 into the exhaust gas flow path 2 of the boiler 1, the dust attached to the heat transfer tubes 4 is peeled off due to the wind pressure and vibration caused by the pressure waves. removed.

In the deposit removing device 20 of the present embodiment, when the methane gas supply step and the oxygen gas supply step are performed in order to generate the pressure wave, the gas for combustion (methane gas, oxygen gas) is supplied into the container 30. The pressure inside container 30 increases. At this time, the sealing body 80 is supported by the portions around the plurality of injection port portions 37 and 57 in the lid body 75 . Therefore, the area where the pressure acts on the sealing body 80 is reduced, and the stress acting on the sealing body 80 can be suppressed. Therefore, not only metal materials with generally high tensile strength but also non-metallic materials with generally low tensile strength can be used as the constituent materials of the sealing body 80 . It is possible to widen the range of selection of materials that can be used as constituent materials of . In addition, according to the attached matter removing apparatus 20 of the present embodiment, since the stress acting on the sealing body 80 can be suppressed, the thickness of the sealing body 80 can be reduced, and the fixing method for fixing the sealing body 80 can be reduced. The means (container-side end plate portion 35, nozzle-side end plate portion 55, bolt 91, and nut 92) can be reduced in size, and the size of the entire device can be reduced. Further, the sealing body 80 is tightened and released from the bolt 91 and the nut 92, and clamped and non-clamped by the container-side end plate portion 35 and the nozzle-side end plate portion 55. It is removable. Therefore, the sealing body 80 can be easily replaced. In this way, the size of the entire apparatus is reduced, which is excellent in portability, and the sealing member 80 can be easily replaced.

As described above, the attached matter removing apparatus and the attached matter removing method of the present invention have been described based on one embodiment, but the present invention is not limited to the configuration described in the above embodiment, and does not deviate from the gist thereof. The configuration can be appropriately changed within the range.

(Another embodiment 1)
In the above embodiment, in the installation step, the sealing body 80 is interposed in advance between the container-side end plate portion 35 (first lid portion 35a) and the nozzle-side end plate portion 55 (second lid portion 55a). An example is shown in which the assembled pressure gun 25 in which the container 30 and the nozzle body 50 are fastened and integrated by bolts 91 and nuts 92 is attached to a location in the boiler 1 where dust removal is required. It is not limited to this.

10A and 10B are explanatory views of another aspect of the mounting operation of the pressure gun 25 in the installation process of the deposit removing method using the deposit removing device 20. FIG. Another aspect of the mounting operation of the pressure cannon 25 will be described with reference to FIGS. 10(a) to (d).

FIG. 10(a) is a state diagram showing the disassembled pressure cannon 25 brought to the vicinity of the boiler 1. FIG. At the timing when it is necessary to remove the dust adhering to the heat transfer tube 4, as shown in FIG. The state pressure gun 25 is transported, for example, using a carriage 400 .

FIG. 10(b) is a state diagram just before the nozzle body 50 is inserted into the boiler 1. FIG. Moreover, FIG.10(c) is a state figure which fastened the nozzle body 50 inserted in the boiler 1. FIG. After removing the blocking plate 16 blocking the opening of the connection duct 15 in FIG. 10(a), as shown in FIGS. The cylindrical portion 53 is inserted, and the nozzle body 50 is pushed forward until the intermediate flange portion 65 of the nozzle body 50 hits the duct flange portion 15 b of the connection duct 15 . After aligning the bolt insertion holes 17 and 77 (FIGS. 3(c) and 3(d)) of the duct flange portion 15b and the intermediate flange portion 65 in the front-rear direction, the bolt insertion holes 17 are , 77 and a nut 94 screwed onto the screw shaft of the bolt 93 is tightened to fasten the nozzle body 50 and the connection duct 15 .

FIG. 10(d) is a diagram showing the state in which the container 30 is fastened with the sealing body 80 interposed in the nozzle body 50 fastened to the boiler 1. FIG. As shown in FIG. 10D, a sealing body 80 is interposed between the container-side end plate portion 35 and the nozzle-side end plate portion 55, and the container-side end plate portion 35 and the nozzle-side end plate portion 55 are The positions of the mutual bolt insertion holes 47 and 67 (see FIGS. 3A and 3B) and the bolt insertion holes 87 of the sealing body 80 (see FIG. 5A) are aligned when viewed in the front-rear direction. The pressure gun 25 is assembled by tightening the bolt 91 inserted through the bolt insertion holes 47 , 67 , 87 and the nut 92 screwed onto the screw shaft of the bolt 91 . In this way, the pressure gun 25 can be attached to a portion of the boiler 1 where dust removal is required while assembling. 10(a) to 10(d), the nozzle body 50, the sealing body 80, and the container 30 are sequentially assembled to the boiler 1 while assembling the pressure gun 25. Since the pressure cannon 25 is attached, the work load can be reduced even though the number of man-hours increases compared to the operation of attaching the pressure cannon 25 shown in FIGS. 7(a) to 7(d).

(Another embodiment 2)
In the above embodiment, as an electrical ignition means for igniting the combustion gas (mixed gas of methane gas and oxygen gas), an example using a glow plug 42 that raises the temperature of the combustion gas by energization and ignites was shown. However, the invention is not limited to this, and a spark plug that ignites and explodes the combustion gas with an electric spark may be used.

(Another embodiment 3)
In the above-described embodiment, if a plurality of pressure guns 25 are prepared in advance and sequentially replaced each time a pressure wave is generated, pressure waves can be generated repeatedly, and deposits can be continuously removed. can do.

(Another embodiment 4)
In the above-described embodiment, the combustible gas and the oxidant gas are supplied to the inside of the container 30, and the mixed gas of these is rapidly combusted inside the container 30 to increase the pressure inside the container 30, thereby 80 is broken to generate a pressure wave, but the present invention is not limited to this. may be used to break the sealing body 80 and generate a pressure wave. In the case of such a deposit removing device, since it does not become an ignition source, it can be applied even when combustible dust adheres to the heat transfer tubes 4 .

(Another embodiment 5)
In the above embodiment, an example in which the injection port portions 37 and 57 are formed in a round hole shape with a circular cross section is shown, but the injection port portions 37 and 57 are not limited to this. There is also a mode in which it is formed in a through hole. In the above-described embodiment, an example in which 19 injection ports 37, 57 are provided in the lid portions 35a, 55a is shown, but the number is not limited, and if the number is two or more, the sealing body 80 is affected. It can suppress the stress to be applied. In the above-described embodiment, two pitch circle diameters D 1 and D 2 are concentrically formed on the circumferences CR ₁ and CR ₂ of the two pitch circle diameters D ₁ and D ₂ based on one injection port portion 37 and 57 provided in the center of the cover body portion 35a and 55a. Although an example in which the cells are arranged so as to be regularly arranged has been shown, the present invention is not limited to this. For example, a mode in which the injection port portions 37, 57 are not provided in the center of the lid portions 35a, 55a, a plurality of injections on the circumference of one pitch circle diameter, or on each circumference of three or more pitch circle diameters There is a mode in which the openings 37 and 57 are arranged regularly. Moreover, there is also a mode in which the plurality of injection port portions 37 and 57 are arranged at random.

Since the deposit removing apparatus of the present invention is a portable deposit removing apparatus that utilizes pressure waves and is excellent in portability, it can be used at the timing when deposit removal is required, for example, by heating a boiler or the like installed in a combustion furnace. It can be used for applications such as removing dust adhering to heat transfer tubes in an exchange device, and removing dust adhering and accumulated on the casing of a dust collector. In particular, the frequency of removing deposits such as dust is low, and there is a strong desire to keep equipment costs low. Are suitable.

1 boiler 4 heat transfer tube (object)
20 Deposit removing device 30 Container 35 Container side end plate (fixing means)
35a first lid portion 37 injection port portion 50 nozzle body 55 nozzle side end plate portion (fixing means)
55a second lid portion 57 injection port portion 75 lid 80 sealing body 80a sealing layer 80b shape maintaining layer 91 bolt (fixing means)
92 nut (fixing means)

Claims (5)

A deposit removing device for removing deposits adhering to an object using pressure waves,
a container having an opening;
a cover provided corresponding to the opening and having a plurality of injection ports leading into the container;
a sealing body that closes the injection port;
fixing means for detachably fixing the sealing body to the lid;
with
configured to break the sealing body by increasing the pressure in the container to generate the pressure wave ;
The lid includes a first lid portion and a second lid portion that are arranged to face each other,
The deposit removing device is configured such that the sealing body is sandwiched between the first lid portion and the second lid portion . The deposit removing device according to claim 1 , further comprising a nozzle body that communicates with the inside of the container through the injection port. 3. The deposit removing device according to claim 1 , wherein the sealing body is composed of a combustible laminate including a sealing layer and a shape-retaining layer. The ratio (S ₁ /S ₂ ) of the opening area (S ₁ ) of the injection port and the opening area (S ₂ ) of the opening is 0.3 to 0.7 . 1. Attachment removing device according to claim 1 . A deposit removal method for removing deposits adhering to an object using pressure waves,
an installation step of installing the deposit removing device according to any one of claims 1 to 4 in a state capable of emitting pressure waves to an object;
a gas filling step of filling the container with a combustible gas and an oxidant gas;
an ignition step of igniting the mixed gas of the combustible gas and the oxidant gas filled in the container;
A deposit removal method comprising:

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