Heat Exchanger Tube Cleaning Method

Abstract

The present invention relates to a method for cleaning a heat exchange tube, and, Including a step for checking for blockage of heat exchange tubes, a step for installing a flow hole generating mechanism, a step for creating a cleaning flow hole, a step for removing the flow hole generating mechanism, a step for installing a connection line, a chemical cleaning step, a wastewater discharge step, and a line removal step, When the heat exchange tube (15) of the heat exchanger (10) is filled with scale (S) and the chemical does not pass through the heat exchange tube (15), the flow hole generating mechanism (70) is conveniently used to allow the chemical to circulate inside the blocked heat exchange tube (15), thereby effectively removing the scale (S) from the blocked heat exchange tube (15).

Description

Technology Field

[0001] The present invention relates to a method for cleaning a heat exchange tube, and more specifically, to a method for cleaning a heat exchange tube that can conveniently and efficiently clean a heat exchange tube that is blocked by scale and difficult to pass chemicals through. Background Technology

[0002] Tubular heat exchangers are widely used in industry, but prolonged use leads to the formation of lime scale and inorganic scale, which reduces thermal efficiency and lowers production efficiency. In particular, power plants generate large amounts of steam during power generation, which is converted back into water using large tubular heat exchangers (also called 'condensers': heat exchangers that convert steam back into water).

[0003] Lime scale and other inorganic scales form on the tubes of heat exchangers, which can be easily removed with acidic chemicals. For example, when cleaning a tubular heat exchanger with an internal volume of 30 tons using chemicals, typically more than 6 tons of chemicals are required, resulting in over 60 tons of chemical wastewater after the process. Consequently, the costs for chemicals and wastewater treatment are substantial. Furthermore, the internal volume of a tubular heat exchanger is calculated by including the volume of the tubes themselves as well as the manhole spaces on either side; since the manhole spaces must also be filled with chemicals, the amount of chemicals required increases significantly.

[0004] In addition, conventionally, when large heat exchangers were cleaned by physical methods (cleaning using pigballs), the cleaning power was poor, and there were safety issues due to the firing of pigballs using high pressure.

[0005] In order to solve these problems, a cleaning method for heat exchange tubes was invented in the past (Korean Registered Patent Publication No. 10-2512818).

[0006] However, conventional cleaning methods for heat exchange tubes had limitations in efficiently cleaning the heat exchange tubes when the heat exchange tubes were completely clogged with scale to the extent that chemicals could not pass through them, and when chemicals were injected into the heat exchange tubes, the chemicals could not pass through the heat exchange tubes. Prior art literature

[0007] Republic of Korea Registered Patent Publication No. 10-2512818 The problem to be solved

[0008] The present invention, aimed at solving the above-mentioned problems, has the objective of providing a method for cleaning a heat exchange tube that can conveniently and efficiently clean a heat exchange tube that is blocked by scale and difficult to pass chemicals through. means of solving the problem

[0009] The means for solving the first problem of the present invention for solving the above-mentioned problem is,

[0010] A step of checking for blockage of a heat exchange tube by opening the first and second doors (18, 18') of the heat exchanger (10) and checking the degree of blockage of the heat exchange tube (15);

[0011] When a blockage is confirmed in the blockage check step of the heat exchange tube (15), a flow hole generating mechanism (70) is installed in the blocked heat exchange tube (15) and the flow hole generating mechanism (70) is installed, the flow hole generating mechanism (70) is connected to the chemical device (40) and the flow hole generating mechanism (70) is installed in the blocked heat exchange tube (15), and the flow hole generating mechanism (70) is connected to the chemical device (40). The flow hole generating mechanism (70) is installed in the main body (71) and the chemical injection part (72) is connected to the chemical supply line (42) of the chemical device (40).

[0012] A cleaning flow hole generation step in which a chemical device (40) is driven so that the chemical is injected into the chemical injection part (72) of the flow hole generation mechanism (70) and then recovered to the chemical recovery part (73) of the flow hole generation mechanism (70), thereby opening the inside of the blocked heat exchange tube (15) and forming a cleaning flow hole (h);

[0013] When a cleaning flow hole (h) is created, a flow hole creation mechanism removal step for removing the flow hole creation mechanism (70);

[0014] A step of installing a connecting line (30) on some of the heat exchange tubes (15) of a heat exchanger (10) so that some of the heat exchange tubes (15) are connected to a single circulation cleaning line, connecting a chemical supply line (42) of a chemical device (40) to the inlet of the heat exchange tube (15) located at the starting point of the circulation cleaning line, and connecting a chemical recovery line (43) of the chemical device (40) to the outlet of the heat exchange tube (15) located at the end point of the circulation cleaning line;

[0015] A chemical cleaning step in which a chemical device (40) is driven to allow the chemical to pass through the circulation cleaning line;

[0016] A wastewater discharge step in which the chemical recovery line (43) of the chemical device (40) is separated from the chemical tank (41) of the chemical device (40) and then the chemical recovery line (43) is connected to the wastewater recovery tank (60), or the chemical recovery line (43) of the chemical device (40) is separated from the outlet of the heat exchange tube (15) located at the end of the circulation cleaning line and then the wastewater recovery line of the wastewater recovery tank (60) is connected to the outlet of the heat exchange tube (15) located at the end of the circulation cleaning line, and the chemical device (40) is driven to discharge wastewater within the circulation cleaning line;

[0017] When the wastewater discharge of the above-mentioned circulation cleaning line is completed, a line removal step of removing the connection line (30), chemical supply line (42), and chemical recovery line (43) connected to the heat exchange tube (15).

[0018] Includes,

[0019] delete

[0020] delete

[0021] delete

[0022] The main body (71) of the fluid hole generating mechanism (70) is equipped with a first through hole (71a) and a second through hole (71b), and

[0023] The drug injection part (72) of the flow hole generating mechanism (70) is inserted into the first through hole (71a), and has one end and the other end respectively protruding outward from the main body part (71), and has one end connected to the drug supply line (42) of the drug device (40); and the injection nozzle (72a) installed in the injection nozzle (72a) to allow the drug to flow only in the direction of the heat exchange tube (15); and

[0024] The drug recovery section (73) of the fluid hole generating mechanism (70) is inserted into the second through hole (71b), and has one end protruding outward from the main body (71) and connected to the drug recovery line (43) of the drug device (40), and has a recovery nozzle (73a) that is exposed outward from the main body (71) less than the injection nozzle (72a).

[0025] It is characterized by the fact that.

[0027] The means for solving the second problem of the present invention is,

[0028] Regarding the means of solving the first problem,

[0029] The main body (71) of the above-mentioned flow hole generating mechanism (70) has an outer shape inclined toward the center of the main body (71) and is made of an elastic material and is press-fitted into a closed heat exchange tube (15).

[0030] It is characterized by the fact that. Effects of the invention

[0031] The present invention, according to the means for solving the above problem, has the effect of efficiently removing the scale (S) from the blocked heat exchange tube (15) by using a flow hole generating mechanism (70) to allow the chemical to circulate inside the blocked heat exchange tube (15) when the heat exchange tube (15) of the heat exchanger (10) is filled with scale (S) and the chemical does not pass through the heat exchange tube (15). Brief explanation of the drawing

[0032] FIG. 1 is a drawing for explaining a heat exchange configuration applied to the present invention, and FIG. 2 is a drawing for explaining the heat exchange tube of a heat exchanger, a chemical device connected thereto, and a connecting line in the present invention, and FIG. 3 is a perspective view for explaining a connecting mechanism among the components applied to the present invention, and FIG. 4 is a drawing for explaining that a connecting mechanism is installed on a heat exchange tube, and FIG. 5 is a drawing for explaining the flow hole generating mechanism of the present invention, and FIGS. 6 to 10 are operational diagrams for explaining a cleaning method of a heat exchange tube of the present invention, and FIG. 11 is a drawing for explaining a cleaning method of a heat exchange tube of the present invention using a distribution mechanism, and FIG. 12 is a front view illustrating a distribution mechanism, and Figure 13 is a side view illustrating a distribution mechanism. Specific details for implementing the invention

[0033] The present invention is capable of various modifications and may have various embodiments, and specific embodiments are illustrated in the drawings and described in detail. However, this is not intended to limit the invention to specific embodiments, and it should be understood that the invention includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention.

[0034] The terms used in this application are used merely to describe specific embodiments and are not intended to limit the invention.

[0035] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which this invention pertains.

[0036] The present invention will be described in detail below so that a person skilled in the art can easily implement it.

[0038] FIG. 1 is a drawing for explaining the heat exchange configuration applied to the present invention, FIG. 2 is a drawing for explaining the heat exchange tube of the heat exchanger and the chemical device and connecting line connected thereto in the present invention, FIG. 3 is a perspective view for explaining the connecting mechanism among the configurations applied to the present invention, FIG. 4 is a drawing for explaining the connecting mechanism installed on the heat exchange tube, and FIG. 5 is a drawing for explaining the flow hole generating mechanism of the present invention. With reference to FIG. 1 to FIG. 5, the configuration applied to the cleaning method of a heat exchange tube with improved convenience and efficiency according to the present invention is described as follows.

[0039] In the cleaning method for a heat exchange tube with improved convenience and efficiency according to the present invention, a heat exchanger (10), a connecting mechanism (20), a connecting line (30), a chemical device (40), and a flow hole generating mechanism (70) are applied.

[0040] As shown in FIGS. 1 and 2, the above heat exchanger (10) comprises a main body (11), a first side plate (12), a second side plate (12'), first and second heat exchange tube mounting plates (13, 13'), a support plate (14), a heat exchange tube (15), a first observation fluid passage pipe (16), a second observation fluid passage pipe (16'), a first side fluid passage pipe (17), a second side fluid passage pipe (17'), a first door (18), and a second door (18'). In the present invention, the heat exchanger (10) is of the large heat exchanger type.

[0041] The above main body (11) has a tubular shape with a space formed inside.

[0042] The first side plate (12) is provided with a first opening hole (12a) that is open in the left and right directions and is installed on the left side of the main body (11).

[0043] The second side plate (12') is provided with a second opening hole (12a') that is open in the left and right directions and is installed on the right side of the main body (11).

[0044] The first and second heat exchange tube installation plates (13, 13') are provided on each side of the main body (11), respectively, and are positioned further inside the main body (11) than the first and second side plates (12, 12'). In the present invention, a first access space (a) is formed between the first heat exchange tube installation plate (13) and the first side plate (12), and a second access space (a') is formed between the second heat exchange tube installation plate (13') and the second side plate (12'). Additionally, in the present invention, a heat exchange space (b) is formed between the first heat exchange tube installation plate (13) and the second heat exchange tube installation plate (13').

[0045] The above support plate (14) is installed inside the main body (11) so as to be positioned between the first and second heat exchange tube installation plates (13, 13'). In the present invention, a plurality of support plates (14) are provided in the left and right directions.

[0046] The above heat exchange tubes (15) are provided in multiple numbers and are installed on the first and second heat exchange tube installation plates (13, 13') respectively, with both ends penetrating the first and second heat exchange tube installation plates (13, 13') respectively. In the present invention, the heat exchange tubes (15) penetrate the multiple support plates (14). In addition, in the present invention, one end (left end) of the heat exchange tube (15) is connected to the first access space (a) of the main body (10), the other end (right end) of the heat exchange tube (15) is connected to the second access space (a') of the main body (10), and the central part of the heat exchange tube (15) is placed in the heat exchange space (b) of the main body (11). Meanwhile, in the present invention, the heat exchange tube (15) forms a pipe shape.

[0047] The first observation fluid passage pipe (16) is provided in the main body (11) so as to be located between the first side plate (12) and the first heat exchange tube installation plate (13). In the present invention, the first observation fluid passage pipe (16) is provided on the upper side of the main body (11) and is connected to the first access space (a).

[0048] The second observation fluid passage pipe (16') is provided in the main body (11) so as to be located between the second side plate (12') and the second heat exchange tube installation plate (13'). In the present invention, the second observation fluid passage pipe (16') is provided on the lower side of the main body (11) and is connected to the second access space (a').

[0049] The first fluid passage pipe (17) is provided on one side of the main body (11) so as to be located between the first heat exchange tube mounting plate (13) and the second heat exchange tube mounting plate (13'). In the present invention, the first fluid passage pipe (17) is provided on the upper right side of the main body (11) and communicates with the heat exchange space (b).

[0050] The second fluid passage pipe (17') is provided on the other side of the main body (11) so as to be located between the first heat exchange tube installation plate (13) and the second heat exchange tube installation plate (13'). In the present invention, the second fluid passage pipe (17') is provided on the lower left side of the main body (11) and communicates with the heat exchange space (b).

[0051] The first door (18) opens and closes the first opening hole (12a) of the first side wall (12). In the present invention, the first door (18) can be installed on the first side wall (12) in various ways, such as a sliding method or a rotating method, to open and close the first opening hole (12a).

[0052] The second door (18') opens and closes the second opening hole (12a') of the second side wall (12'). In the present invention, the second door (18') can be installed on the second side wall (12') in various ways, such as a sliding method or a rotating method, to open and close the second opening hole (12a').

[0053] The above connecting mechanism (20) has a connector (21) and an insert (22), as shown in FIGS. 2 to 4.

[0054] The above connector (21) allows fluid to pass through its interior. In the present invention, the interior of the connector (21) forms a pipe shape. Meanwhile, in the present invention, the connector (21) is detachably installed to allow the chemical supply line (42) of the chemical device (40), the chemical recovery line (43) of the chemical device (40), or the connection line (30).

[0055] The above insert (22) is installed (or detachably installed) on the connector (21), having a flexible elastic material insertion tube portion (22a) that is inserted and removed from the connection line (30) and at least two plate-shaped gripping wing portions (22b) made of a flexible elastic material and installed at the bottom of the insertion tube portion (22a). In the present invention, the insertion tube portion (22a) has a circular tube shape and a plurality of circular sealing rings (22a1) are provided on the outer side in an up-and-down direction. In addition, in the present invention, the insert (22) is made of rubber or silicone material. Meanwhile, in the present invention, the insertion tube portion (22a) is made of a flexible elastic material, making it easy to insert a nipple-type connector (21) into the insertion tube portion (22a) and increasing airtightness. In addition, in the present invention, the insertion tube portion (22a) is made of a flexible elastic material and can be pressed into the heat exchange tube (15).

[0056] One end of the above connecting line (30) is installed (detachably installed) on a heat exchange tube (15), and the other end is installed (detachably installed) on another heat exchange tube (15). In the present invention, the connecting line (30) is connected to the heat exchange tube (15) via a connecting mechanism (20). At this time, in the present invention, one end of the connecting line (30) is installed (detachably installed) on a connecting body (21) of the connecting mechanism (20), and the other end is installed (detachably installed) on a connecting body (21) of another connecting mechanism (20). Meanwhile, in the present invention, the connecting line (30) forms a pipe-type tube shape.

[0057] The above chemical device (40) comprises a chemical tank (41) for storing a chemical for cleaning (washing) a heat exchanger (10), a chemical supply line (42) connected to the chemical tank (41) through which the chemical from the chemical tank (41) is discharged, a chemical recovery line (43) connected to the chemical tank (41) through which the chemical used to clean the heat exchanger (10) is recovered, a chemical supply valve (44) installed in the chemical supply line (42) to open and close the chemical supply line (42), and a chemical recovery valve (45) installed in the chemical recovery line (43) to open and close the chemical recovery line (43). In this embodiment, the chemical tank (41) may be equipped with a stainless steel filter to prevent foreign substances in the recovered chemical from flowing back into the chemical supply line (42). In addition, the chemical device (40) of this embodiment may be equipped with an on / off switch (not shown) and a pressure gauge (not shown) capable of checking the chemical injection pressure. Meanwhile, in this embodiment, the chemical may be any cleaning solution (cleaning solution) capable of cleaning (washing) the heat exchange tube (15).

[0058] The above-mentioned fluid hole generating mechanism (70) is equipped with a main body part (71), a drug injection part (72), and a drug recovery part (73), as shown in FIG. 5.

[0059] The above main body (71) is installed in the heat exchange tube (15) having a first through hole (71a) and a second through hole (71b). In this embodiment, the main body (71) has a cylindrical shape with its outer side inclined (tapered) toward the center of the main body (71), and the first through hole (71a) and the second through hole (71b) are arranged vertically relative to each other. In addition, in this embodiment, the main body (71) is made of an elastic material (rubber or urethane material) and is pressed into the heat exchange tube (15), but various fastening methods may be applied as long as it can be detachably installed in the heat exchange tube (15). Meanwhile, in this embodiment, it is preferable that the second through hole (71b) has a larger diameter than the second through hole (71a).

[0060] The above drug injection part (72) is provided in the main body part (71) and is connected to the drug supply line (42) of the drug device (40).

[0061] The above drug injection unit (72) is equipped with an injection nozzle (72a) and a check valve (72b).

[0062] The injection nozzle (72a) is inserted into the first through hole (71a), and one end (right end) and the other end (left end) protrude outward from the main body (71), respectively, and one end is connected to the drug supply line (42) of the drug device (40).

[0063] The above check valve (72b) is installed in the injection nozzle (72a) to allow the chemical to flow only in the direction of the heat exchange tube (15). In this embodiment, the check valve (72b) can be installed at various locations on the injection nozzle (72a).

[0064] Meanwhile, in this embodiment, the check valve (72b) may be a conventional one-touch check valve, and in this case, a connection part is provided at each end of the check valve (72b), so that the chemical supply line (42) is installed so as to be detachably attached to one end connection part of the check valve (72b) in a one-touch coupling manner, and the injection nozzle (72a) is installed so as to be detachably attached to the other end connection part of the check valve (72b) in a one-touch coupling manner.

[0065] The above-mentioned drug recovery unit (73) is provided in the main body (71) and connected to the drug recovery line (43) of the drug device (40). In this embodiment, the drug recovery unit (73) is equipped with a recovery nozzle (73a) and connected to the drug recovery line (43).

[0066] The above recovery nozzle (73a) is inserted into the second through hole (71b), and one end (right end) protrudes outward from the main body (71) and is connected to the drug recovery line (43) of the drug device (40), while the other end is exposed outward from the main body (71) less than the injection nozzle (72a). In this embodiment, the other end of the recovery nozzle (73a) forms an up-and-down alignment with the other end of the main body (71). Meanwhile, in this embodiment, it is preferable that the diameter of the recovery nozzle (73a) be larger than that of the injection nozzle (72a).

[0067] Meanwhile, in this embodiment, the drug recovery unit (73) may be provided with a drug recovery line connection unit (73b) provided at the other end of the recovery nozzle (73a). In this embodiment, the drug recovery line connection unit (73b) is detachably connected to the drug recovery line (43), and as an example, a one-touch coupling may be applied.

[0068] In addition, in this embodiment, the fluid hole generating mechanism (70) can be formed by connecting each component of the fluid hole generating mechanism (70) to each other to form an integrated structure.

[0070] FIGS. 6 to 10 are operational diagrams for explaining a cleaning method of a heat exchange tube according to the present invention. The present invention will be described with reference to FIGS. 6 to 10 as follows.

[0071] The cleaning method of a heat exchange tube according to the present invention includes a step of checking whether the heat exchange tube is clogged, a step of installing a flow hole generating mechanism, a step of creating a cleaning flow hole, a step of removing the flow hole generating mechanism, a step of installing a connection line, a chemical cleaning step, a wastewater discharge step, and a line removal step.

[0072] The step of checking for blockage of the heat exchange tube above involves opening the first and second doors (18, 18') of the heat exchanger (10) and checking the degree of blockage of the heat exchange tube (15).

[0073] In this embodiment, a worker opens the first door (12) and enters the first access space (a), and the worker opens the second door (12') and enters the second access space (a') (see FIG. 6). Then, the worker checks which of the multiple heat exchange tubes (15) is blocked. At this time, various methods of checking for blockage of the heat exchange tube (15) can be applied, such as the worker visually checking using lighting, etc.

[0074] In the above step of installing the flow hole generating mechanism, if the blockage of the heat exchange tube (15) is confirmed in the blockage checking step, the flow hole generating mechanism (70) is installed in the blocked heat exchange tube (15), and the flow hole generating mechanism (70) is connected to the chemical device (40).

[0075] In this embodiment, the operator inserts and installs the main body (71) of the flow hole generating mechanism (70) into the other end (right end) of the blocked heat exchange tube (15), connects the chemical supply line (42) of the chemical device (40) to the chemical injection part (72) of the flow hole generating mechanism (70), and connects the chemical recovery line (43) of the chemical device (40) to the chemical recovery part (73) of the flow hole generating mechanism (70) (see FIG. 7). Meanwhile, in this embodiment, the flow hole generating mechanism (70) is installed at the other end (right end) of the blocked heat exchange tube (15), but depending on the blocked state of the blocked heat exchange tube (15), the flow hole generating mechanism (70) may also be installed at one end (left end) of the blocked heat exchange tube (15).

[0076] Meanwhile, in this embodiment, when there are multiple blocked heat exchange tubes (15), the operator installs multiple flow hole generating mechanisms (70) in each blocked heat exchange tube (15).

[0077] The above cleaning flow hole creation step involves driving the chemical device (40) so that the chemical is injected into the chemical injection part (72) of the flow hole creation mechanism (70) and then recovered to the chemical recovery part (73) of the flow hole creation mechanism (70), thereby opening the inside of the blocked heat exchange tube (15) and forming a cleaning flow hole (h).

[0078] In this embodiment, when the chemical device (40) is driven and the chemical is sprayed into the clogged heat exchange tube (15), the chemical comes into contact with the internal scale (S) of the clogged heat exchange tube (15).

[0079] And, the chemical that came into contact with the scale (S) is recovered to the chemical device (40) through the chemical recovery section (73) of the flow hole generating mechanism (70) (see FIG. 7).

[0080] In this way, when a chemical is injected and recovered into a blocked heat exchange tube (15) through a flow hole generating mechanism (70), the chemical comes into contact with the scale (S) of the blocked heat exchange tube (15) and removes the scale (S), thereby partially clearing the scale (S) inside the blocked heat exchange tube (15). That is, a cleaning flow hole (h) through which the chemical can pass is created inside the blocked heat exchange tube (15) (see FIG. 8).

[0081] At this time, the operator can confirm that a cleaning flow hole (h) has been created in the blocked heat exchange tube (15) by confirming that the chemical is discharged from the blocked heat exchange tube (15).

[0082] The above step of removing the flow hole generating mechanism involves removing the flow hole generating mechanism (70) when the cleaning flow hole (h) is created. That is, the flow hole cleaning mechanism (70) is separated from the heat exchange tube (15) where the cleaning flow hole (h) is created. At this time, the chemical supply line (42) and the chemical recovery line (43) are separated from the flow hole generating mechanism (70).

[0083] The above connection line installation step involves installing a connection line (30) on some of the heat exchange tubes (15) among the plurality of heat exchange tubes (15) of the heat exchanger (10) so that some of the heat exchange tubes (15) are connected to a single circulation cleaning line, connecting a chemical supply line (42) of a chemical device (40) to the inlet of the heat exchange tube (15) located at the starting point of the circulation cleaning line, and connecting a chemical recovery line (43) of the chemical device (40) to the outlet of the heat exchange tube (15) located at the end point of the circulation cleaning line.

[0084] In this embodiment, the operator installs a connecting mechanism (20) at each end of a plurality of connecting lines (30) so that the connecting mechanism (20) is mounted at both ends of the plurality of connecting lines (30).

[0085] Next, the operator installs a connecting line (30) equipped with a connecting mechanism (20) on each of the heat exchange tubes (15) to be cleaned so that the multiple heat exchange tubes (15) to be cleaned are connected to a single circulation cleaning line (see FIG. 9).

[0086] Then, the operator installs the connecting mechanism (20) in the chemical supply line (42) of the chemical device (40), installs the connecting mechanism (20) at the inlet of the heat exchange tube (15) located at the starting point of the circulation cleaning line, and installs the connecting mechanism (20) in the chemical recovery line (43) of the chemical device (40), installs the connecting mechanism (20) at the outlet of the heat exchange tube (15) located at the end point of the circulation cleaning line. (See FIG. 9)

[0087] The above chemical cleaning step drives the chemical device (40) to allow the chemical to pass through the circulation cleaning line.

[0088] At this time, in this embodiment, after the operator opens the chemical supply valve (44) and the chemical recovery valve (45) of the chemical device (40) and then operates the chemical device (40), the chemical in the chemical tank (41) is supplied to the circulation cleaning line and then recovered back to the chemical tank (41). (Refer to the direction of the arrow in FIG. 9)

[0089] The above wastewater discharge step involves disconnecting the chemical recovery line (43) of the chemical device (40) from the chemical tank (41) of the chemical device (40) and then connecting the chemical recovery line (43) to the wastewater recovery tank (60), or disconnecting the chemical recovery line (43) of the chemical device (40) from the outlet of the heat exchange tube (15) located at the end of the circulation cleaning line and then connecting the wastewater recovery line (not shown) of the wastewater recovery tank (60) to the outlet of the heat exchange tube (15) located at the end of the circulation cleaning line, and driving the chemical device (40) to discharge the wastewater within the circulation cleaning line.

[0090] In this embodiment, the chemical recovery line (43) of the chemical device (40) is separated from the chemical tank (41) of the chemical device (40) and then the chemical recovery line (43) is connected to the wastewater recovery tank (60) (see FIG. 10). At this time, in the present invention, the chemical recovery line (43) may also be connected to a separate wastewater discharge pipe (not shown).

[0091] The above line removal step removes the connection line (30), chemical supply line (42), and chemical recovery line (43) connected to the heat exchange tube (15) when the wastewater discharge of the above circulation cleaning line is completed.

[0092] Afterward, the operator can set up another circulation cleaning line and clean the circulation cleaning line in the same manner as above.

[0094] FIG. 11 is a drawing for explaining a cleaning method of a heat exchange tube of the present invention using a distribution mechanism, FIG. 12 is a front view for explaining a distribution mechanism, and FIG. 13 is a side view for explaining a distribution mechanism. The present invention using a distribution mechanism is described as follows with reference to FIG. 11 to FIG. 13.

[0095] In the present invention, when there are multiple circulating cleaning lines (see C1 to C3 in FIG. 8), a distribution mechanism (50) is provided during the connection line installation step, so that the chemical is supplied to each circulating cleaning line (C1 to C3) through the distribution mechanism (50) which receives the chemical from the chemical device (40).

[0096] At this time, the distribution mechanism (50), as illustrated in FIGS. 11 to 13, comprises: a distribution mechanism body (51) having an inlet (51a) through which a chemical is introduced from a chemical tank (41) and an outlet (51b) through which a chemical from a recovery unit (53) is discharged to the chemical tank (41); and a distribution unit (52) installed on the distribution mechanism body (51) having a plurality of distribution ports (52a) that are in communication with the inlet (51a) and are respectively connected to one side of a plurality of circulation cleaning lines (C1~C3) via a plurality of distribution lines, and through which a chemical from the inlet (51a) is distributed. It includes a recovery unit (53) installed in the main body of the distribution device (51) and configured to recover chemicals from the multiple circulating cleaning lines (C1~C3), with multiple recovery ports (53a) each connected to the other side of the multiple circulating cleaning lines (C1~C3) via multiple distribution recovery lines and connected to the discharge port (51b).

[0098] The present invention, as described above, has the effect of efficiently removing scale (S) from a blocked heat exchange tube (15) by using a flow hole generating mechanism (70) to allow the chemical to circulate inside the blocked heat exchange tube (15) when the heat exchange tube (15) of the heat exchanger (10) is filled with scale (S) and the chemical does not pass through the heat exchange tube (15).

[0099] That is, when a chemical is injected into a blocked heat exchange tube (15) without a flow hole generating mechanism (70), the chemical fills the inside of the heat exchange tube (15) and comes into static contact with the scale (S), making it difficult to remove the scale (S).

[0100] However, in the present invention, by using a flow hole generating mechanism (70) to inject a chemical into a blocked heat exchange tube (15) and causing the chemical to circulate inside the blocked heat exchange tube (15), the chemical dynamically contacts the scale (S) and the scale (S) is efficiently removed, thereby easily creating a cleaning flow hole (h), and the heat exchanger (10) can be efficiently cleaned by passing the chemical through the heat exchange tube (15) in which the cleaning flow hole (h) is created.

[0101] Here, the present invention is provided with a check valve (72b) in the drug injection part (72) of the flow hole generating mechanism (70), so that the circulation of the drug through the flow hole generating mechanism (70) is effectively achieved.

[0102] In addition, the present invention is configured such that the lengths of the chemical injection part (72) and the chemical recovery part (73) are different from each other, so that when the flow hole generating mechanism (70) is installed in the blocked heat exchange tube (15), the positions of the chemical injection part (72) and the chemical recovery part (73) can be accurately aligned. For example, the chemical injection part (72) can be positioned on the upper side inside the blocked heat exchange tube (15), and the chemical recovery part (73) can be positioned on the lower side inside the blocked heat exchange tube (15). Furthermore, in the present invention, the chemical injection part (72) protrudes laterally so that the chemical can apply strong pressure to the scale (S), and the chemical recovery part (73) is positioned on the lower side inside the blocked heat exchange tube (15) so that the flow of the chemical can be smooth. In addition, in the present invention, the diameter of the drug recovery section (73) is larger than the diameter of the drug injection section (72), so that the flow of the drug can be smooth.

[0103] In addition, the present invention allows for convenient removal of scale (S) from the heat exchange tube (15) by easily installing the flow hole generating mechanism (70) in the heat exchange tube (15).

[0104] In addition, the present invention has a main body (71) of the flow hole generating mechanism (70) made of an elastic material, and the outer side of the main body (71) of the flow hole generating mechanism (70) is tapered, so that the flow hole generating mechanism (70) can be easily inserted and removed from a blocked heat exchange tube (15) and securely fixed.

[0105] The present invention allows for more efficient cleaning of the heat exchange tube (15) by penetrating a part of the blocked heat exchange tube (15) and cleaning the heat exchange tube (15) through Korean Registered Patent Publication No. 10-2512818 (method for cleaning a heat exchange tube), thereby enabling the smooth occurrence of the effect of Korean Registered Patent Publication No. 10-2512818 (method for cleaning a heat exchange tube). Explanation of the symbols

[0107] 10: Heat exchanger 11: Main body 12,12': 1st and 2nd side walls 13,13': 1st and 2nd heat exchange tube mounting plates 14: Support plate 15: Heat exchange tube 16,16': 1st and 2nd observation fluid passage pipes 17,17': 1st and 2nd communication fluid passage pipes 18,18': 1st and 2nd doors 20: Connecting mechanism 21: Connector 22: Insert 22a: Insertion tube section 22b: Grasping wing section 30: Connection line 40: Chemical device 41: Chemical tank 42: Chemical supply line 43: Chemical recovery line 44: Chemical supply valve 45: Chemical recovery valve 50: Distributor 51: Main body of the distributor 52: Distribution unit 53: Recovery unit 60: Sewage recovery tank 70: Flow hole generating mechanism 71: Main body 72: Chemical injection unit 73: Chemical recovery unit S: Scale a: Cleaning flow hole

Claims

Claim 1 A step for checking whether the heat exchange tube is blocked by opening the first and second doors (18, 18') of the heat exchanger (10) and checking the degree of blockage of the heat exchange tube (15); and when blockage of the heat exchange tube (15) is confirmed in the step for checking whether the heat exchange tube is blocked, a main body (71); a chemical injection part (72) provided in the main body (71) and connected to the chemical supply line (42) of the chemical device (40); A fluid hole generating mechanism (70) having a chemical recovery unit (73) provided in the main body (71) and connected to the chemical recovery line (43) of the chemical device (40) is installed in a blocked heat exchange tube (15), and the fluid hole generating mechanism (70) is connected to the chemical device (40) in a fluid hole generating mechanism installation step; a chemical device (40) is driven so that the chemical is injected into the chemical injection unit (72) of the fluid hole generating mechanism (70) and then recovered to the chemical recovery unit (73) of the fluid hole generating mechanism (70), thereby forming a cleaning fluid hole (h) by opening the inside of the blocked heat exchange tube (15); a fluid hole generating mechanism removal step in which the fluid hole generating mechanism (70) is removed when the cleaning fluid hole (h) is created; and some of the plurality of heat exchange tubes (15) of the heat exchanger (10). A step of installing a connecting line (30) on some of the heat exchange tubes (15) so that the heat exchange tubes (15) are connected to a single circulation cleaning line, connecting a chemical supply line (42) of a chemical device (40) to the inlet of the heat exchange tube (15) located at the starting point of the circulation cleaning line, and connecting a chemical recovery line (43) of the chemical device (40) to the outlet of the heat exchange tube (15) located at the end point of the circulation cleaning line; and a chemical cleaning step of driving the chemical device (40) so that the chemical passes through the circulation cleaning line;The method includes a wastewater discharge step in which the chemical recovery line (43) of the chemical device (40) is separated from the chemical tank (41) of the chemical device (40) and then the chemical recovery line (43) is connected to the wastewater recovery tank (60), or the chemical recovery line (43) of the chemical device (40) is separated from the outlet of the heat exchange tube (15) located at the end of the circulation cleaning line and then the wastewater recovery line of the wastewater recovery tank (60) is connected to the outlet of the heat exchange tube (15) located at the end of the circulation cleaning line, and the chemical device (40) is driven to discharge wastewater within the circulation cleaning line; and a line removal step in which, when the wastewater discharge of the circulation cleaning line is completed, the connecting line (30), the chemical supply line (42), and the chemical recovery line (43) connected to the heat exchange tube (15) are removed, wherein the main body (71) of the flow hole generating mechanism (70) is The drug injection part (72) of the flow hole generating mechanism (70) is equipped with a first through hole (71a) and a second through hole (71b), and is inserted into the first through hole (71a), with one end and the other end respectively protruding outward from the main body part (71), and one end connected to the drug supply line (42) of the drug device (40); A cleaning method for a heat exchange tube, characterized by having a check valve (72b) installed in an injection nozzle (72a) to allow the chemical to flow only in the direction of the heat exchange tube (15); and the chemical recovery part (73) of the flow hole generating mechanism (70) is inserted into the second through hole (71b), and has one end protruding outward from the main body part (71) and connected to the chemical recovery line (43) of the chemical device (40), and the other end being exposed outward from the main body part (71) less than the injection nozzle (72a). Claim 2 A cleaning method for a heat exchange tube according to claim 1, wherein the main body (71) of the fluid hole generating mechanism (70) has an outer side inclined toward the center of the main body (71), is made of an elastic material, and is press-fitted into a blocked heat exchange tube (15). Claim 3 delete

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