JP7555389B2 - Heat exchanger cleaning system and heat exchanger cleaning method - Google Patents

Description

The present invention relates to a heat exchanger cleaning system and a heat exchanger cleaning method, and more specifically, to a heat exchanger cleaning system and a heat exchanger cleaning method that improve the cleaning efficiency of a target rotating body, which is one component of a heat exchanger.

Nitrogen oxides (NO _x ) are contained in exhaust gas discharged from combustion engines such as boilers, and such nitrogen oxides cause pollution and therefore need to be removed before being discharged into the atmosphere. Selective catalytic reduction (SCR) is a method that is mainly used to remove nitrogen oxides contained in exhaust gas. Meanwhile, when exhaust gas passes through an SCR device, the concentration of sulfur trioxide in the exhaust gas increases, and ammonia (NH ₃ ) used in the catalytic reaction of the SCR device reacts with sulfur trioxide and moisture (H ₂ O) contained in the exhaust gas to form ammonium hydrogen sulfate (NH ₄ HSO ₄ ) - also called ammonium bisulfate. When a heat exchanger (GAH (gas air heater) or GGH (gas gas heater)) provided downstream of the SCR device is operated continuously for a long period of time, foreign substances (reactants) including ammonium hydrogen sulfate are accumulated inside the heat exchanger, resulting in a problem of reduced ventilation inside the heat exchanger.

To solve this problem, a heat exchanger cleaning device (soot blower) can be installed at the top and/or bottom of the heat exchanger to remove foreign matter that has accumulated inside the heat exchanger.

Conventionally, foreign matter has been removed by injecting high-temperature steam or high-pressure water into the heat exchanger. However, when high-pressure water is injected, the moisture concentration in the exhaust gas increases, which reduces the performance and lifespan of the equipment installed downstream of the heat exchanger (e.g., dust collectors). It is also necessary to provide a separate device to collect the large amount of wastewater generated.

Korean Patent Registration No. 10-1555227 (Patent Document 1) discloses a dry cleaning method that uses dry ice pellets instead of the conventional method of spraying high-pressure water. This method is effective when only ammonium hydrogen sulfate is present as a foreign substance, but it is difficult to remove foreign substances that are a combination of various components due to deterioration of fuel quality, etc. In particular, when the air temperature is very low and the foreign substances are frozen, there is a problem that the dry cleaning method alone cannot effectively remove the foreign substances.

Korean Patent No. 10-1387024 (Patent Document 2) discloses a method for removing foreign matter from inside a heat exchanger by injecting high-temperature steam and dry ice pellets into the heat exchanger. According to this method, high-temperature steam and dry ice pellets are injected from a cleaning device disposed on the inlet side of the heat exchanger in the flow direction of the supply air and/or exhaust gas. However, since the temperature at the inlet of the heat exchanger where the exhaust gas flows in is high, the sublimation speed of the dry ice pellets may be accelerated, and the cleaning effect may be reduced. If high-temperature steam injected from a cleaning device disposed at the inlet of the heat exchanger where the supply air flows in flows into the inside of the boiler, damage to the boiler may be induced, and the thermal efficiency of the boiler may also be reduced. In addition, even if high-temperature steam and dry ice pellets are injected, the target rotates and the cleaning device also moves, so there is a problem that the cleaning effect at a specific target point may be reduced.

Korean Patent No. 10-1555227 Korean Patent No. 10-1387024

The object of the present invention is to provide a heat exchanger cleaning system and a heat exchanger cleaning method that improve the cleaning efficiency of a target rotating body, which is one component of a heat exchanger.

The heat exchanger cleaning system according to one embodiment of the present invention may include a target rotor rotating around a virtual axis of rotation extending in one direction, a first inlet located at the top of the target rotor, a first outlet located at the bottom of the target rotor facing the first inlet, a second inlet located at the bottom of the target rotor spaced apart from the first outlet, a second outlet located at the top of the target rotor facing the second inlet, and a first soot blower located in the internal space of the first inlet.

The first inlet may be a passage through which a first gas flows toward the target rotating body. The first outlet may be a passage through which the first gas that has passed through the target rotating body is discharged. The second inlet may be a passage through which a second gas having a lower temperature than the first gas flows toward the target rotating body. The second outlet may be a passage through which the second gas that has passed through the target rotating body is discharged.

The first soot blower may include a first nozzle through which a first material is sprayed toward the target rotating body and a second nozzle through which a second material is sprayed toward the target rotating body. The second nozzle may be located at a predetermined distance from the first nozzle.

The first distance that the first jet nozzle is spaced from the virtual axis of rotation of the target rotor may be substantially the same as the second distance that the second jet nozzle is spaced from the virtual axis of rotation of the target rotor.

The first and second injection ports may be positioned facing target points that are spaced apart from each other on the circumference of a concentric circle of the target rotor.

The first material and the second material can be sprayed sequentially at a target point of the target rotor as the target rotor rotates about the virtual rotation axis.

The first substance can be hot steam and the second substance can be dry ice pellets.

The first soot blower may be positioned adjacent to the second outlet.

The heat exchanger cleaning system according to one embodiment of the present invention may further include a second soot blower located in the internal space of the first outlet.

The second soot blower may include a third nozzle through which the first material is sprayed toward the target rotating body and a fourth nozzle through which the second material is sprayed toward the target rotating body. The fourth nozzle may be located at a predetermined distance from the third nozzle.

The third distance that the third jet nozzle is spaced from the virtual axis of rotation of the target rotor may be substantially the same as the fourth distance that the fourth jet nozzle is spaced from the virtual axis of rotation of the target rotor.

The third injection port and the fourth injection port may be located facing each of the target points located on the circumference of a concentric circle of the target rotor and spaced apart from each other.

The second soot blower may be positioned adjacent to the second inlet.

The heat exchanger cleaning system according to one embodiment of the present invention may further include a drive unit that adjusts the positions of the first soot blower and the second soot blower.

The driving unit can move the first soot blower and the second soot blower farther or closer to the virtual rotation axis of the target rotor. The driving unit can adjust the separation distance between the first jet orifice and the second jet orifice to position the first soot blower such that the first distance and the second distance are substantially the same as each other. The driving unit can adjust the separation distance between the third jet orifice and the fourth jet orifice to position the second soot blower such that the third distance and the fourth distance are substantially the same as each other.

The first material and the second material can be sprayed simultaneously and continuously while the target rotor rotates.

A heat exchanger cleaning method using the heat exchanger cleaning system according to one embodiment of the present invention may include the steps of positioning the first soot blower in the internal space of the first inlet, simultaneously spraying the first material through the first nozzle of the first soot blower and the second material through the second nozzle of the first soot blower toward the target rotor while the target rotor rotates, and removing foreign materials by having the first material and the second material sequentially reach a point on the target rotor.

The first distance that the first jet nozzle is spaced from the virtual axis of rotation of the target rotor may be substantially the same as the second distance that the second jet nozzle is spaced from the virtual axis of rotation of the target rotor.

The first substance can be hot steam and the second substance can be dry ice pellets.

In the step of positioning the first soot blower, the first soot blower can be positioned adjacent to the second outlet. Also, each of the first and second jets can be positioned to face a target point located on the circumference of a concentric circle of the target rotor and spaced apart from each other.

The heat exchanger cleaning method according to one embodiment of the present invention may further include the steps of positioning a second soot blower in the internal space of the first outlet, and simultaneously spraying the first material through a third nozzle of the second soot blower and the second material through a fourth nozzle toward the target rotor while the target rotor rotates.

Here, the third distance that the third jet nozzle is spaced from the virtual axis of rotation of the target rotor may be substantially the same as the fourth distance that the fourth jet nozzle is spaced from the virtual axis of rotation of the target rotor.

In the step of positioning the second soot blower, the second soot blower can be positioned adjacent to the second inlet. Also, the third injection port and the fourth injection port can be positioned to face target points that are located on the circumference of a concentric circle of the target rotor and spaced apart from each other.

The heat exchanger cleaning method according to one embodiment of the present invention may further include a step of adjusting the respective positions of the first soot blower and the second soot blower by a driving unit connected to the first soot blower and the second soot blower while the target rotating body rotates.

In the step of adjusting the positions of the first soot blower and the second soot blower, each of the first soot blower and the second soot blower can be moved farther or closer to the virtual rotation axis of the target rotor. Also, the separation distance between the first jet nozzle and the second jet nozzle of the first soot blower can be adjusted so that the first distance and the second distance are substantially the same as each other. Also, the separation distance between the third jet nozzle and the fourth jet nozzle of the second soot blower can be adjusted so that the third distance and the fourth distance are substantially the same as each other.

The heat exchanger cleaning system and method according to one embodiment of the present invention can effectively remove foreign matter from a target rotating body by spraying high-temperature steam and dry ice pellets at the same point on the target rotating body.

1 is a schematic diagram of a heat exchanger cleaning system according to one embodiment of the present invention. 1 is a perspective view of a portion of a heat exchanger cleaning system according to one embodiment of the present invention. 1 is a top view of a portion of a heat exchanger cleaning system according to one embodiment of the present invention. FIG. 2 is a bottom view of a portion of a heat exchanger cleaning system according to one embodiment of the present invention. 1 is a perspective view of a portion of a heat exchanger cleaning system according to one embodiment of the present invention. 1 is a perspective view of a portion of a heat exchanger cleaning system according to one embodiment of the present invention. 1 is a top view of a portion of a heat exchanger cleaning system according to one embodiment of the present invention. 1 is a top view of a portion of a heat exchanger cleaning system according to one embodiment of the present invention. FIG. 2 is a bottom view of a portion of a heat exchanger cleaning system according to one embodiment of the present invention. FIG. 2 is a bottom view of a portion of a heat exchanger cleaning system according to one embodiment of the present invention.

The present invention can be modified in various ways and can have various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. However, this is not intended to limit the invention to the specific disclosed forms, and should be understood as including all modifications, equivalents, and alternatives within the spirit and technical scope of the invention.

In this application, the terms "include" or "have" are intended to specify the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, and should be understood as not excluding the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof. In addition, when a structure (or part) is described as being "on" (or "on top of") another structure (or part), this includes not only the case where it is "directly on" the other structure (or part), but also the case where there is another structure (or part) in between. Similarly, when a structure (or part) is described as being "under" (or "under") another structure (or part), this includes not only the case where it is "directly under" the other structure (or part), but also the case where there is another structure (or part) in between. In addition, the above (or "upper") and "lower" (or "lower") refer to the position of the heat exchanger when viewed from the side (sometimes called the front or back depending on the viewpoint) in a horizontal position (see FIG. 1 of this application). Therefore, even if the heat exchanger is tilted or upside down depending on the state of use, when understanding this invention, the position of each component (or part) must be understood assuming that the heat exchanger is in its original horizontal position.

In describing each drawing, like reference numerals are used for like components. Terms such as first, second, etc. may be used to describe various components, but the components should not be limited by the terms. Terms are used only for the purpose of distinguishing one component from another component. For example, a first component may be named as a second component, and similarly, a second component may be named as a first component, without departing from the scope of the present invention. A singular expression includes a plural expression unless the context clearly indicates otherwise.

Hereinafter, the embodiments of the present invention will be described in more detail with reference to the attached drawings.

Figure 1 is a schematic diagram (sometimes called a front view, a side view, or a rear view depending on the viewpoint) of a heat exchanger cleaning system according to one embodiment of the present invention, and Figure 2 is a perspective view of a portion of a heat exchanger cleaning system according to one embodiment of the present invention.

First, referring to Figures 1 and 2, a heat exchanger cleaning system according to one embodiment of the present invention may include a target rotating body 10, a first inlet 20 and a first outlet 23 through which a first gas G1 moves, a second inlet 30 and a second outlet 33 through which a second gas G2 moves, a soot blower 100, and a drive unit 50.

The target rotor 10 can rotate around a virtual rotation axis 1 extending in a first direction DR1. The target rotor 10 is a device that allows mutual heat exchange between high-temperature gas and low-temperature gas passing through the target rotor 10 while rotating around the virtual rotation axis 1, and can be, for example, an air preheater or a gas preheater.

The target rotor 10 may include an outer frame 11, an inner frame 13, and a heat exchange plate 15.

The external frame 11 may be an annular frame having a predetermined height extended in the first direction DR1, intersecting with the first direction DR1, and having an internal space corresponding to a plane formed by the second direction DR2 and the third direction DR3 that intersect with each other.

The internal frame 13 may be a frame that divides the internal space of the external frame 11 in the radial and circumferential directions.

The heat exchange plate 15 can be provided within an area defined by the outer frame 11 and the inner frame 13. The heat exchange plate 15 can be a lattice-shaped or wrinkled metal plate.

The first inlet 20 may be located at the top of the target rotor 10. The first inlet 20 may be a passage through which the first gas G1 flows toward the target rotor 10. Here, the first inlet 20 may be connected to equipment such as a boiler (not shown), and in this case, the first gas G1 may be high-temperature gas discharged from inside the equipment (not shown), for example, the first gas G1 may be substantially exhaust gas.

The first outlet 23 may be disposed at the bottom of the target rotating body 10. The first outlet 23 may be located opposite the first inlet 20 across the target rotating body 10. The first outlet 23 may be a passage through which the first gas G1 flowing into the first inlet 20 passes through the target rotating body 10 and is then discharged to the outside. The temperature of the first gas G1 discharged through the first outlet 23 may be lower than the temperature of the first gas G1 flowing in through the first inlet 20.

The second inlet 30 may be located at the bottom of the target rotating body 10. The second inlet 30 may be located away from the first outlet 23. The second inlet 30 may be a passage through which the second gas G2 flows toward the target rotating body 10. Here, the second gas G2 is a gas having a lower temperature than the first gas G1, and may be, for example, air supplied from the outside.

The second outlet 33 may be located at the top of the target rotating body 10. The second outlet 33 may be located away from the first inlet 20. The second outlet 33 may be located opposite the second inlet 30 across the target rotating body 10. The second outlet 33 may be a passage through which the second gas G2 flowing in through the second inlet 30 passes through the target rotating body 10 and is then discharged. The temperature of the second gas G2 discharged through the second outlet 33 may be higher than the temperature of the second gas G2 flowing in through the second inlet 30. In addition, the temperature of the second gas G2 discharged through the second outlet 33 may be lower than the temperature of the first gas G1 flowing in through the first inlet 20.

The second outlet 33 can be connected to the equipment (not shown), and in this case, the second gas G2 can be supplied to the inside of the equipment (not shown).

The soot blower 100 is a device for cleaning the target rotor 10 and can be located in a region above and/or below the target rotor 10.

In one embodiment of the present invention, the soot blower 100 may include a first soot blower 101 and a second soot blower 102.

The first soot blower 101 can be located in a region above the target rotor 10 and disposed in the internal space of the first inlet 20.

The second soot blower 102 may be located in a region at the bottom of the target rotor 10 and disposed in the internal space of the first outlet 23. The second soot blower 102 may be located opposite the first soot blower 101.

The first soot blower 101 and the second soot blower 102 will be described in more detail below.

The driving unit 50 may adjust the positions of the first soot blower 101 and the second soot blower 102 together/simultaneously or respectively. The driving unit 50 may adjust the positions of the first soot blower 101 and the second soot blower 102 to be farther or closer to the virtual rotation axis 1. Here, the first soot blower 101 and the second soot blower 102 may be moved in a direction parallel to a plane formed by the second direction DR2 and the third direction DR3 while maintaining a constant separation distance from the target rotating body 10.

Figure 3 is a plan view of a portion of a heat exchanger cleaning system according to an embodiment of the present invention, and Figure 4 is a bottom view of a portion of a heat exchanger cleaning system according to an embodiment of the present invention. Figures 5 and 6 are perspective views of a portion of a heat exchanger cleaning system according to an embodiment of the present invention, respectively. Hereinafter, the first soot blower 101 and the second soot blower 102 will be described in detail with reference to Figures 3 to 6.

First, referring to FIG. 3 and FIG. 5, the first soot blower 101 may be positioned overlapping the first region R1 of the target rotor 10. Here, the first region R1 may be a region where the first inlet 20 is disposed on the target rotor 10. The first soot blower 101 may remove foreign matter on the upper part of the target rotor 10 while the target rotor 10 rotates.

The first soot blower 101 may include a first supply unit 110 to which a first material M1 is supplied and a second supply unit 120 to which a second material M2 is supplied. In one embodiment of the present invention, the first material M1 may be high temperature steam, and the second material M2 may be dry ice pellets.

The first supply unit 110 may include a first supply passage 111 through which the first material M1 moves and a first injection port 113 through which the first material M1 is injected. The first injection port 113 may be located at a first distance D1 from the virtual rotation axis 1.

The second supply unit 120 may include a second supply passage 121 through which the second material M2 moves and a second injection port 123 through which the second material M2 is injected. The second injection port 123 may be located at a certain distance from the first injection port 113. The second injection port 123 may be located at a second distance D2 from the virtual rotation axis 1.

In one embodiment of the present invention, when the first injection port 113 and the second injection port 123 are located on a plane substantially parallel to the plane formed by the second direction DR2 and the third direction DR3, the first distance D1 and the second distance D2 may be substantially the same. That is, the first injection port 113 and the second injection port 123 may be located facing each of target points located on the circumference of one concentric circle of the target rotor 10 and spaced apart from each other.

While the target rotating body 10 rotates, the first material M1 and the second material M2 can be sprayed simultaneously and continuously. This allows the second material M2 to sequentially reach a point on a concentric circle of the target rotating body 10 where the first material M1 is sprayed.

The first soot blower 101 can be positioned adjacent to the second region R2, which is the region where the second outlet 33 is located on the target rotor 10.

When the first gas G1 is flowed into the first inlet 20 in a high temperature state, the temperature of the internal space of the first inlet 20 can be maintained at a high temperature similar to the temperature of the first gas G1. When the first soot blower 101 injects the first material M1 and the second material M2 into the internal space of the first inlet 20, it may be difficult for the first material M1 and the second material M2 to reach the target rotor 10 due to the temperature of the internal space of the first inlet 20. In particular, when the second material M2 is provided as dry ice pellets, the dry ice pellets may sublime due to the temperature of the internal space of the first inlet 20 in a high temperature state.

As a result, the first soot blower 101 can be located in a relatively low temperature area within the first region R1. In other words, by positioning the first soot blower 101 as close to the second region R2 as possible within the first region R1, the amount of sublimation of the dry ice pellets can be minimized.

In FIG. 3, the first soot blower 101 is illustrated and described as being positioned such that the first supply unit 110 is closer to the second region R2 than the second supply unit 120, but this is not limited thereto, and the first soot blower 101 may also be positioned such that the second supply unit 120 is closer to the second region R2 than the first supply unit 110.

In FIG. 3, the first supply unit 110 and the second supply unit 120 are illustrated as being integrally formed within the first soot blower 101, but this is not limited thereto. The first supply unit 110 and the second supply unit 120 may also be separated from each other and positioned at a certain distance apart.

Referring to FIG. 4, the second soot blower 102 may be positioned overlapping the third region R3 of the target rotor 10. Here, the third region R3 may be a region where the first outlet 23 is disposed at the bottom of the target rotor 10. The second soot blower 102 may remove foreign matter at the bottom of the target rotor 10 while the target rotor 10 rotates.

The second soot blower 102 may include a third supply section 130 to which the first material M1 is supplied and a fourth supply section 140 to which the second material M2 is supplied.

The third supply unit 130 may include a third supply path 131 through which the first material M1 moves and a third injection port 133 through which the first material M1 is injected. The third injection port 133 may be located at a third distance D3 from the virtual rotation axis 1.

The fourth supply unit 140 may include a fourth supply passage 141 through which the second material M2 moves and a fourth injection port 143 through which the second material M2 is injected. The fourth injection port 143 may be located at a certain distance from the third injection port 133. The fourth injection port 143 may be located at a fourth distance D4 from the virtual rotation axis 1.

In one embodiment of the present invention, when the third injection port 133 and the fourth injection port 143 are located on a plane substantially parallel to the plane formed by the second direction DR2 and the third direction DR3, the third distance D3 and the fourth distance D4 may be substantially the same. That is, the third injection port 133 and the fourth injection port 143 may be located facing each of target points located on the circumference of one concentric circle of the target rotor 10 and spaced apart from each other.

While the target rotating body 10 rotates, the first material M1 and the second material M2 can be sprayed simultaneously and continuously. This allows the second material M2 to sequentially reach a point on a concentric circle of the target rotating body 10 where the first material M1 is sprayed.

The second soot blower 102 may be positioned adjacent to the fourth region R4, which is the region where the second inlet 30 is located at the bottom of the target rotor 10.

The temperature of the first gas G1 discharged through the first outlet 23 after passing through the target rotating body 10 may be lower than the temperature of the first gas G1 flowing in through the first inlet 20, but higher than the temperature of the second gas G2 flowing in through the second inlet 30.

As a result, the second soot blower 102 is positioned as close as possible to the fourth region R4 within the third region R3, thereby minimizing the amount of sublimation of the dry ice pellets, which are the second material M2.

In addition, the second soot blower 102 may inject a larger amount of the first material M1 and the second material M2 than the first soot blower 101 .

Because the first material M1 and the second material M2 are sprayed in a direction opposite to the direction in which the first gas G1 is discharged through the first outlet 23, it may be difficult for the first material M1 and the second material M2 sprayed from the second soot blower 102 to reach the target rotating body 10.

This is because by increasing the amount of the first material M1 and the second material M2 sprayed from the second soot blower 102, it is possible to easily remove foreign matter from the lower part of the target rotor 10.

In FIG. 4, the second soot blower 102 is illustrated and described as being positioned such that the fourth supply unit 140 is closer to the fourth region R4 than the third supply unit 130, but this is not limited thereto, and the second soot blower 102 may be positioned such that the third supply unit 130 is closer to the fourth region R4 than the fourth supply unit 140.

Conventionally, the second soot blower 102 was positioned to overlap the fourth region R4, but in this case, the first material M1 and the second material M2 sprayed from the second soot blower 102 flowed into the inside of the equipment (not shown), causing a problem of degraded equipment characteristics. However, in one embodiment of the present invention, the second soot blower 102 is positioned to overlap the third region R3, thereby preventing the first material M1 and the second material M2 sprayed from the second soot blower 102 from flowing into the inside of the equipment (not shown). That is, in the present invention, for example, a soot blower is not disposed in the second region R2 and the fourth region R4 through which air supplied from the outside flows in and passes.

In FIG. 4, the third supply unit 130 and the fourth supply unit 140 are illustrated as being integrally formed within the second soot blower 102, but this is not limited thereto. The third supply unit 130 and the fourth supply unit 140 may also be separated from each other and positioned at a certain distance apart.

Referring to FIG. 5 and FIG. 6, the target rotating body 10 may rotate counterclockwise around the virtual rotation axis (1, see FIG. 1). The first material M1 and the second material M2 may be simultaneously and continuously sprayed toward the target rotating body 10 while the target rotating body 10 rotates.

The first material M1 and the second material M2 sequentially reach a single point on the target rotating body 10, so that foreign matter on the target rotating body 10 can be easily removed.

First, the first material M1 can reach a first point P1 of the target rotating body 10. As the target rotating body 10 rotates counterclockwise, the first point P1 moves counterclockwise, the first material M1 can reach a new second point P2, and the second material M2 can reach the first point P1.

This makes it possible to easily remove foreign matter from the first point P1 where the first material M1 and the second material M2 arrive sequentially.

Figures 7 and 8 are plan views of a portion of a heat exchanger cleaning system according to one embodiment of the present invention. Hereinafter, with reference to Figures 7 and 8, it will be described how the position of the first soot blower 101 is adjusted by the driving unit 50.

Referring to Figures 1 and 7, the position of the first soot blower 101 can be adjusted by the driving unit 50 to be farther or closer to the virtual rotation axis 1. While the position of the first soot blower 101 is adjusted, the first distance D1 and the second distance D2 can be maintained at substantially the same interval.

Referring to FIG. 8, a fifth distance D5, which is a distance between the first injection port 113 and the second injection port 123 of the first soot blower 101, can be adjusted by the driving unit 50. The fifth distance D5 can be shortened or lengthened depending on the rotation speed of the target rotor 10.

Figures 9 and 10 are bottom views of a portion of a heat exchanger cleaning system according to one embodiment of the present invention. Hereinafter, with reference to Figures 9 and 10, it will be described how the position of the second soot blower 102 is adjusted by the driving unit 50.

Referring to Figures 1 and 9, the position of the second soot blower 102 can be adjusted by the driving unit 50 to be farther or closer to the virtual rotation axis 1. While the position of the second soot blower 102 is adjusted, the third distance D3 and the fourth distance D4 can be maintained at substantially the same interval.

Referring to FIG. 10, a sixth distance D6, which is a distance between the third injection port 133 and the fourth injection port 143 of the second soot blower 102, can be adjusted by the driving unit 50. The sixth distance D6 can be shortened or lengthened depending on the rotation speed of the target rotor 10.

The following describes a heat exchanger cleaning method for cleaning the target rotating body 10 using the heat exchanger cleaning system. For ease of explanation, any explanation that overlaps with the explanation of the heat exchanger cleaning system described above will be omitted.

The heat exchanger cleaning method according to one embodiment of the present invention may include the steps of positioning the first soot blower 101 in the internal space of the first inlet 20, simultaneously injecting the first material M1 through the first injection port 113 of the first soot blower 101 and the second material M2 through the second injection port 123 of the first soot blower 101 toward the target rotor 10 while the target rotor 10 rotates, and sequentially causing the first material M1 and the second material M2 to reach a point on the target rotor 10 to remove foreign materials.

Here, the first distance D1 between the first injection nozzle 113 and the virtual rotation axis 1 of the target rotating body 10 may be substantially the same as the second distance D2 between the second injection nozzle 123 and the virtual rotation axis 1 of the target rotating body 10.

The first material M1 can be hot steam and the second material M2 can be dry ice pellets.

In the step of positioning the first soot blower 101, the first soot blower 101 can be positioned adjacent to the second outlet 33 at the top of the target rotor 10.

The first distance D1 that the first injection nozzle 113 is spaced from the virtual axis of rotation 1 of the target rotor 10 may be substantially the same as the second distance D2 that the second injection nozzle 123 is spaced from the virtual axis of rotation 1 of the target rotor 10.

The heat exchanger cleaning method according to one embodiment of the present invention may further include the steps of positioning the second soot blower 102 in the internal space of the first outlet 23 at the bottom of the target rotor 10, and simultaneously spraying the first material M1 through the third nozzle 133 of the second soot blower 102 and the second material M2 through the fourth nozzle 143 of the second soot blower 102 toward the target rotor 10 while the target rotor 10 rotates.

The third distance D3, which is the distance between the third injection nozzle 133 and the virtual axis of rotation 1 of the target rotor 10, may be substantially the same as the fourth distance D4, which is the distance between the fourth injection nozzle 143 and the virtual axis of rotation 1 of the target rotor 10.

In the step of positioning the second soot blower 102, the second soot blower 102 can be positioned adjacent to the second inlet 30 at the bottom of the target rotor 10.

The heat exchanger cleaning method according to one embodiment of the present invention may further include a step of adjusting the respective positions of the first soot blower 101 and the second soot blower 102 by a driving unit 50 connected to the first soot blower 101 and the second soot blower 102 while the target rotor 10 rotates.

Each of the first soot blower 101 and the second soot blower 102 can be moved away from or closer to the virtual rotation axis 1 of the target rotor 10. In this case, the distance between the first injection port 113 and the second injection port 123 of the first soot blower 101 can be adjusted so that the first distance D1 and the second distance D2 are substantially the same as each other, and the distance between the third injection port 133 and the fourth injection port 143 of the second soot blower 102 can be adjusted so that the third distance D3 and the fourth distance D4 are substantially the same as each other.

The present invention has been described above based on a preferred embodiment, but a person skilled in the art or with ordinary knowledge in the art can understand that the present invention can be modified and changed in various ways without departing from the concept and technical scope of the present invention as described in the claims below.

Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be determined by the claims.

10: Target rotating body 20: First inlet 23: First outlet 30: Second inlet 33: Second outlet 101: First soot blower 102: Second soot blower 50: Drive unit 113: First nozzle 123: Second nozzle 133: Third nozzle 143: Fourth nozzle M1: First substance M2: Second substance

Claims (14)

A target rotating body that rotates around a virtual axis of rotation extending in one direction;
a first inlet located at an upper portion of the target rotor through which a first gas flows toward the target rotor;
a first outlet located at a lower portion of the target rotor opposite the first inlet, through which the first gas that has passed through the target rotor is discharged;
a second inlet located at a lower portion of the target rotor and spaced apart from the first outlet, through which a second gas having a lower temperature than the first gas flows toward the target rotor;
A second outlet is located on the upper part of the target rotor opposite the second inlet, and the second gas passing through the target rotor is discharged from the second outlet; and a first soot blower is located in an internal space of the first inlet,
The first soot blower comprises:
a first nozzle for spraying a first material toward the target rotating body; and a second nozzle located at a predetermined distance from the first nozzle for spraying a second material toward the target rotating body,
a first distance that the first jet nozzle is spaced from the imaginary axis of rotation of the target rotor is substantially equal to a second distance that the second jet nozzle is spaced from the imaginary axis of rotation of the target rotor;
the first substance is hot steam and the second substance is dry ice pellets;
The heat exchanger cleaning system , wherein the first sootblower is located adjacent to the second outlet . The heat exchanger cleaning system according to claim 1, wherein the first material and the second material are sprayed sequentially onto a target point of the target rotor as the target rotor rotates about the virtual axis of rotation. The heat exchanger cleaning system according to claim 1, wherein each of the first and second jets is located opposite a target point located on the circumference of a concentric circle of the target rotor and spaced apart from each other. a second soot blower located in the interior space of the first outlet;
The second soot blower is
a third nozzle through which the first material is sprayed toward the target rotating body; and a fourth nozzle located at a predetermined distance from the third nozzle and through which the second material is sprayed toward the target rotating body,
2. The heat exchanger cleaning system of claim 1, wherein a third distance that the third jet nozzle is spaced from the imaginary axis of rotation of the target rotor is substantially the same as a fourth distance that the fourth jet nozzle is spaced from the imaginary axis of rotation of the target rotor. The heat exchanger cleaning system of claim 4 , wherein the second sootblower is positioned adjacent to the second inlet. 5. The heat exchanger cleaning system according to claim 4 , wherein the third injection port and the fourth injection port are positioned opposite target points spaced apart from each other on a circumference of a concentric circle of the target rotor. The soot blower further includes a driving unit for adjusting the positions of the first soot blower and the second soot blower,
The drive unit moves the first soot blower and the second soot blower so as to be farther or closer to the virtual rotation axis of the target rotating body,
The heat exchanger cleaning system of claim 4, wherein the first soot blower is positioned by adjusting a separation distance between the first jet nozzle and the second jet nozzle so that the first distance and the second distance are substantially equal to each other, and the second soot blower is positioned by adjusting a separation distance between the third jet nozzle and the fourth jet nozzle so that the third distance and the fourth distance are substantially equal to each other. The heat exchanger cleaning system of claim 1, wherein the first material and the second material are sprayed simultaneously and continuously while the target rotor rotates. A target rotating body that rotates around a virtual axis of rotation extending in one direction;
a first inlet located at an upper portion of the target rotor through which a first gas flows toward the target rotor;
a first outlet located at a lower portion of the target rotor opposite the first inlet, through which the first gas that has passed through the target rotor is discharged;
a second inlet located at a lower part of the target rotor and spaced apart from the first outlet, through which a second gas having a lower temperature than the first gas flows toward the target rotor; and a second outlet located at an upper part of the target rotor facing the second inlet, through which the second gas having passed through the target rotor is discharged,
positioning a first sootblower in the interior space of the first inlet;
While the target rotor rotates, a first material is injected toward the target rotor through a first injection port of the first soot blower and a second material is injected toward the target rotor through a second injection port located at a predetermined distance from the first injection port of the first soot blower; and the first material and the second material are sequentially delivered to a point of the target rotor to remove foreign materials,
a first distance that the first jet nozzle is spaced from the imaginary axis of rotation of the target rotor is substantially equal to a second distance that the second jet nozzle is spaced from the imaginary axis of rotation of the target rotor;
the first substance is hot steam and the second substance is dry ice pellets;
In the step of positioning the first soot blower,
The method of cleaning a heat exchanger further comprises positioning the first sootblower adjacent to the second outlet . In the step of positioning the first soot blower,
10. The method for cleaning a heat exchanger according to claim 9 , wherein the first jet nozzle and the second jet nozzle are positioned to face target points spaced apart from each other on the circumference of a concentric circle of the target rotor. positioning a second soot blower in an internal space of the first outlet; and simultaneously injecting the first material through a third nozzle of the second soot blower and the second material through a fourth nozzle located at a certain distance away from the third nozzle of the second soot blower toward the target rotor while the target rotor rotates,
10. The heat exchanger cleaning method of claim 9, wherein a third distance that the third jet nozzle is spaced from the virtual axis of rotation of the target rotor is substantially the same as a fourth distance that the fourth jet nozzle is spaced from the virtual axis of rotation of the target rotor. In the step of positioning the second soot blower,
The method of claim 11 , further comprising positioning the second sootblower adjacent to the second inlet. In the step of positioning the second soot blower,
The heat exchanger cleaning method according to claim 11, wherein the third jet nozzle and the fourth jet nozzle are positioned to face target points spaced apart from each other on the circumference of a concentric circle of the target rotor. The method further includes a step of adjusting the positions of the first soot blower and the second soot blower by a driving unit connected to the first soot blower and the second soot blower while the target rotating body rotates,
In the step of adjusting the positions of the first soot blower and the second soot blower,
Each of the first soot blower and the second soot blower is moved away from or closer to the imaginary axis of rotation of the target rotor;
A separation distance between the first and second jet ports of the first soot blower is adjusted so that the first and second distances are substantially equal to each other;
The method of claim 11 , wherein a separation distance between the third and fourth jet nozzles of the second sootblower is adjusted such that the third and fourth distances are substantially equal to each other.

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