KR101351220B1 - Heat exchanger having water leak detection device, and method for detecting water leak of thereof - Google Patents

Abstract

The present invention relates to a heat exchanger equipped with a leakage detection device and a leakage detection method thereof. The heat exchanger equipped with a body having a tube and in which a circulation fluid flows and a water box installed at both sides of the body to supply or discharge cooling water exchanging heat with the circulation fluid to the tube comprises a leakage detection device equipped with a synthesis tube sheet composed by the combination of a leakage detection panel and a tube sheet by being installed at both ends of the body to which the end of the tube passes through. The leakage detection panel (230) includes a plurality of leakage water collection grooves surrounding a tube through hole and collecting leaked cooling water at one surface in contact with the tube sheet to collect the leaked cooling water leaked along the gap between the tube and the tube through hole of the tube sheet while passing through the synthesis tube sheet; a plurality of leakage guide grooves for connecting the leakage collection grooves; and a first water collection line passing through the leakage guide grooves to collect the leaked cooling water flowing through the leakage guide groove. The present invention can quickly prevent leakage with an immediate alarm while recognizing the leakage during pressure changes by detecting pressure changes obtained by collecting the leaked cooling water for the leakage which can occur between the synthesis tube sheet composed by the connection of the tube sheet and the leakage detection panel (230) and the tube.

Description

Heat exchanger having a leak detection device, and a leak detection method thereof {Heat exchanger having water leak detection device, and method for detecting water leak of

The present invention relates to a heat exchanger, and more particularly, in a shell and tube type heat exchanger, detecting an leakage and a leak point occurring between a tube and a tube sheet mounted inside the body, generating an alarm, and mixing circulating water and cooling water. The present invention relates to a heat exchanger equipped with a leak detection device for accurately detecting a leak point and preventing the leak, and a leak detection method thereof.

In general, shell-and-tube type heat exchangers are mainly used for heat exchange in refrigeration equipment, chemical plants and generators. The shell-and-tube heat exchanger includes a plurality of tubes inside the shell (or the body), and is configured to exchange heat between the circulating water and the cooling water.

An example of a shell and tube heat exchanger used in a refrigerating device or a chemical plant is disclosed in Korean Patent Application Publication No. 2011-0128709. One example of such a conventional heat exchanger 10 is a shell portion 11, a cap portion 12 coupled to both sides of the shell portion 11, and a circulating water injection portion formed in the shell portion 11. 13 and the circulating water discharge portion 14, a plurality of tubes (16) embedded in the shell portion 11 through the tube sheet 15 to guide the flow of the cooling water, and the cooling water injection formed in both caps 12, respectively The part 17 or the cooling water discharge part 18 was included. Here, the circulating water is any one of steam, liquid, or co-carrier. In addition, the tube sheet 15 is provided on both sides of the shell portion 11, respectively, and is installed at the boundary between the shell portion 11 and the cap portion 12, and one end of the tube 16 is fixed to each tube sheet 15. It is installed by the bolt 19, which caused the coolant flowing into the cap portion 12 flowed into the tube (16).

Therefore, while the coolant flowing through the coolant inlet 17 flows horizontally through the plurality of tubes 16 to the coolant outlet 18, the coolant is introduced into the shell 11 through the circulating water inlet 13. The circulating water was vertically moved and discharged to the circulating water discharge unit 14. At this time, the circulating water was in contact with the outer surface of the tube 16 and the heat exchange with the cooling water was made.

However, the tube 16 is mounted to the tube sheet 15 through the fixing bolt 19 to initially prevent leakage of water from the cooling water of the cap 12 into the circulating water of the shell 11, but after a long time elapses. Leakage due to aging was inevitably encountered, and above all, it was difficult to confirm the leakage. In addition, in order to block leakage, the entire fixing bolt 10 must be replaced, not selective. At this time, the replacement time of the fixing bolt 10 is also difficult to estimate, whether or not leakage occurs at one or several leak points. Regardless, they had to be replaced regularly. In addition, the leak point, the amount of leakage can not be measured, there is still a problem that the water quality of the circulating water is reduced by mixing the leaked cooling water and the circulation water.

Meanwhile, as another example, the shell-and-tube heat exchanger 20 used in the generator may include a body 21 and a water box 22 and a body 21 respectively installed at both sides of the body 21 and the body 21. At the boundary between the circulating fluid inlet portion 21a mounted on the upper part of the cooling medium, the cooling water inlet portion 22a and the cooling water outlet portion 22b installed in the water box 22, the body 21 and the water box 22, respectively. Installed tube sheet 23, a tube 24 having one end mounted on each tube sheet 23, a circulating fluid tank 25 mounted on the lower part of the body 21, a circulation mounted on the circulating fluid tank 25 The fluid outlet 25a, the tube sheet 23 and the tube 24, the lower side of the junction portion of the circulation fluid tank 25 built in both sides of the leak detection tray 25b was included. Here, an end portion of the tube 24 penetrating the tube sheet 23 is welded to one surface of the tube sheet 23 on the water box 22 side, and thus a welding portion W is formed.

Therefore, while the circulating fluid (water vapor state) flowing into the body 21 through the circulating fluid inlet portion 21a flows into the circulating fluid tank 25, the inflow from the water box 22 of the cooling water inlet portion 22a is introduced. The cooled water flowed through the tube 24 to the water box 22 of the coolant outlet 22b. At this time, the cooling water is exchanged with the circulating fluid flowing in contact with the outer surface of the tube 24, whereby the circulating fluid flowed into the fluid tank 25 after being condensed into the water vapor state.

Due to this, the welding portion W for coupling the tube sheet 23 and the tube 24 blocks the leakage of the coolant of the water box 22 into the circulating fluid of the body 21, but the welding portion W ), Or aging after a long period of time, water leakage occurred due to cracks or gaps in the welded portions (W). The leakage caused the cooling water to be mixed with the circulating fluid, and the minerals of the cooling water were contained in the circulating fluid, which caused corrosion of the boiler tube (not shown). In order to detect such a leak, the water collected in the leak detection tray 25b inside the circulating fluid tank 25 and under the weld portion W of the tube sheet 23 and the tube 24 is analyzed for leaks. A method of detecting or optionally measuring the electrical conductivity of the circulating fluid to analyze the presence or absence of an inorganic substance has been used.

However, since the conventional method detects leakage by observing the leakage detection tray 25b or analyzing the circulation water after the leakage of the tube sheet 23 and the tube 24, the mixed concentration of the inorganic material reaches the detection threshold. It could not be detected at all before this time, and even if it was detected, the circulating fluid and the cooling water were already mixed, so that the leak occurred only after the circulating fluid containing the mineral damaged the boiler tube. In addition, the problem of not being able to measure the leak point and the amount of leakage still remained, and thus, it was extremely difficult to determine whether to stop the operation of the generator immediately or to stop after some more operation.

KR2011-0128709 10

The present invention has been made to solve the above problems, the tube is coupled to the composite tube sheet is a tube sheet and the leak detection panel is bonded, by allowing the coolant leaked between the composite tube sheet and the tube, the leaked coolant To detect the coolant leak in the composite tube sheet by detecting the pressure change and to detect the leak point, and to prevent the mixing of the coolant and the circulating water during the heat exchanger operation before the leak prevention work after leaking. An object of the present invention is to provide an apparatus, a heat exchanger having the same, and a leak detection method of the heat exchanger.

In order to achieve the above object, the heat exchanger equipped with a leak detection apparatus according to the present invention includes a body having a tube embedded in an inner space into which a circulating fluid enters and a body of the body for introducing or discharging coolant to exchange heat with the circulating fluid. A heat exchanger having a water box mounted on both sides, the leak detection device having a composite tube sheet formed by combining the tube sheet and the leak detection panel, respectively installed at both ends of the body to penetrate the end of the tube; And the leak detection panel is formed of a plurality of cooling water to surround each tube through hole on one surface in contact with the tube sheet to collect the leaking coolant passing through the composite tube sheet along the gap between the tube and the tube sheet hole Leak collection groove; A plurality of leak-inducing grooves having a predetermined length while communicating with the leak-collecting grooves for flowing the leaked coolant collected in the leak-collecting grooves; And a first collection line configured to communicate with the leakage induction grooves to collect the leakage cooling water flowing in the leakage induction groove.

Here, the leak detection device further includes a pressure gauge installed on the first collection line to measure the pressure change by the leakage coolant flowed into the first collection line to detect the pressure change of the first collection line to generate a leakage alarm. Is done.

In addition, a first valve is installed on the first collecting line to discharge the leakage cooling water introduced into the first collecting line.

In addition, the leak detection device is a second collection line branched from the first collection line, the leakage collection tank connected to the second collection line, the leakage collection tank is housed for the separate collection of the leakage coolant flowed into the first collection line The pump further includes a pump installed in the leak collection tank for backflowing the sensing liquid or gas to the tube and the tube sheet and eluting the leaked one or more welded sites.

In this case, a second valve is installed on the second collection line to guide the leakage cooling water in the first collection line to the second collection line, and a third valve is installed in the leakage collection tank to discharge the leakage cooling water in the leakage collection tank. Is installed.

In addition, the leak-inducing groove is, for example, made in the form of an inclined straight line and a plurality of leak collection grooves, a plurality of leaks are formed adjacent to each other while the form of the straight line is disconnected from each other, or in the form of a slanted straight line in another example It is made through the collection groove, and a plurality of straight forms are formed to communicate with each other.

In addition, the heat exchanger further comprises a circulating fluid tank mounted to the body to collect the circulating fluid discharged by heat exchange in the body, the body is formed with a circulating fluid inlet for the introduction of the circulating fluid, each water The box is provided with a cooling water inlet or a cooling outlet for the inlet or outlet of the coolant, and a circulation fluid outlet for the discharge of the circulating fluid is formed in the circulation fluid tank.

On the other hand, the method for detecting a leak in the heat exchanger according to the present invention, if the leak occurs in the synthetic tube sheet through the crack of the welded portion of the tube and the composite tube sheet, the leaked cooling water is leaked each tube in the leak detection panel A first step (S10) collected in a leak collection groove formed to surround a passing tube through hole; A second step (S20) of collecting the leakage cooling water collected in the leakage collection groove along the leakage induction groove to the first collection line; A third step (S30) of generating an alarm after the pressure gauge measures the pressure change caused by the leaking coolant on the first collecting line; A fourth step (S40) in which the leak cooling water of the first collecting line is collected into the leak collecting tank through the second collecting line; A fifth step (S50) of distilling the fluid in the leak collecting tank by the pump and eluting the leaked one or a plurality of welded parts to extract the leak point; And a sixth step (S60) of performing a waterproof operation at the leak point.

According to the present invention as described above, when the pressure change by collecting the leaked cooling water for the leaks that may occur between the composite tube sheet and the tube formed by the tube sheet and the leak detection panel bonded to the surface contact, It recognizes the leak and immediately generates an alarm, so there is a quick leak prevention work.

In addition, the leak detection liquid or colored gas can be flowed back from the leak collection tank to accurately detect one or more leak points, and the work cost is reduced as the leak prevention work is performed only on the leak points. There is a saving effect.

In addition, because the leaked coolant is collected separately in the leak collection tank through the leak collection groove, the leak guide groove, the first collection line and the second collection line, the leaked coolant and circulation that may occur before the leak prevention work is performed. The mixing of water is blocked beforehand.

In addition, the leak can be detected in real time during the start-up of the heat exchanger, and thus there is an effect that can be suppressed with minimal damage to the leak.

In addition, even if the defects are checked after the heat exchanger is manufactured, there is an effect of ensuring the convenience and stability that can be easily checked before the start of the heat exchanger even for defects that occur during transportation or transfer to the crane.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description, serve to further the understanding of the technical idea of the invention, It should not be interpreted.
1 and 2 are side cross-sectional and partially enlarged views schematically showing an example of a conventional heat exchanger.
3 is a side cross-sectional view schematically showing another embodiment of the conventional heat exchanger.
4 is a perspective view schematically showing the appearance of a heat exchanger equipped with a leak detection apparatus according to a preferred embodiment of the present invention.
5 is a sectional view taken along line AA in Fig.
6 is a side view schematically showing the leak detection apparatus shown in FIG.
7 is a side view showing another embodiment of the leak collecting groove and the leak guide groove shown in FIG.
8 is a block diagram illustrating the operation of a heat exchanger equipped with a leak detection apparatus according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the detailed description of known functions and configurations incorporated herein will be omitted when it may unnecessarily obscure the subject matter of the present invention.

<Configuration>

Figure 4 is a perspective view schematically showing the appearance of a heat exchanger having a leak detection apparatus according to a preferred embodiment of the present invention, Figure 5 is a cross-sectional view taken along line AA of Figure 4, Figure 6 is a leak detection shown in Figure 5 The device is a schematic side view, and FIG. 7 is a side view of another embodiment of the leak collecting groove and the leak guide groove shown in FIG. 6.

Heat exchanger 100 equipped with a leak detection device according to the present invention, as shown in Figures 4 to 6, the body 110, the water box 120, the circulating fluid tank 130 and the leak detection device 200 ) Is included. The circulating fluid referred to below is a term for collectively referring to steam for operating a turbine (not shown) of a generator and condensate in a state of being heat-exchanged with cooling water.

First, the body 110 is a member that provides a space for heat exchange between the circulating fluid and the cooling water, the circulating fluid inlet 111 is mounted on the upper portion, the circulating fluid tank 130 is mounted on the lower side, respectively on both sides As the composite tube sheet 210 is mounted, an end of the tube 140 passes through each of the composite tube sheets 210. Here, the composite tube sheet 210 is coupled to the tube sheet 220 and the leak detection panel 230 in surface contact, a detailed description thereof will be described later. In addition, the circulating fluid inlet 111 is configured to guide the low temperature, low pressure steam passing through the turbine into the body 110. The inside of the body 110 is arranged so that the introduced steam is in contact with the outer surface of the tube 140 while a plurality of tubes 140 into which the coolant is introduced. In addition, a circulation fluid tank 130 is installed at a lower portion of the body 110 to collect condensed water generated by heat exchange of steam, and the description of the circulation fluid tank 130 will be described later.

In addition, the water box 120 is mounted on both sides of the body 110, one each formed with a cooling water inlet 121 for the inlet of the coolant, and the other one formed with a cooling outlet (122) for the discharge of the coolant, respectively. do.

In addition, the circulating fluid tank 130 collects condensate generated by the conversion of the heat exchanged with the cooling water while passing through the body 110, and supplies the condensed water back to the boiler (not shown). It is installed to communicate with the inner space of the body 110 in the lower portion of the body 110 to fall naturally. Of course, the circulating fluid tank 130 is equipped with a circulating fluid outlet 131 for discharging condensate, and a pump (not shown) for supplying the condensate.

Meanwhile, the leak detection device 200 includes a tube sheet 220, a leak detection panel 230, a pressure gauge 240, and a leak collection tank 250. Here, the tube sheet 220 is similar to or the same as the conventional tube sheet, the thickness is made thinner than the conventional tube sheet. Also,

First, the leak detection panel 230 is a member that is mounted in surface contact with the tube sheet 220 through which the end of the tube 140 is coupled through, a plurality of tube through holes 231, a plurality of leak collection grooves 232 ), The leak guide groove 233, and the first collecting line 234 is formed. Here, the leak detection panel 230 is mounted with the tube sheet 220 to form a composite tube sheet 210, the thickness of the composite tube sheet 210 is a conventional tube sheet 23 (see Fig. 3) In order to be the same as or similar to the thickness of, the thickness of the tube sheet 220 of the present invention is reduced, the leak detection panel 230 is manufactured to have a thickness of the reduced thickness. For example, when the thickness of the conventional tube sheet 220 is about 30 mm, the thickness of the tube sheet 220 of the present invention is about 20 mm, and the leak detection panel 230 is about 10 to 15 mm. The leak detection panel 230 may be mounted on one surface (hereinafter, referred to as front side) or the other side (hereinafter referred to as backside) of the water box 120 side of the tube sheet 220, More preferably it is mounted on the rear side. At this time, the end of the tube 140 and the tube sheet 220 are joined by mutual welding to form a welding site (W).

Here, the tube through hole 231 is a hole through which the end of the tube 140 closely penetrates, and is formed in a number of alignments in the leak detection panel 230, and the same position and size as the tube hole formed in the tube sheet 220. And number.

In addition, the leak collection groove 232 is a groove for collecting the leaked coolant (hereinafter, referred to as leak coolant) when the coolant of the water box 120 is leaked through the synthetic tube sheet 210, the leak detection panel It is formed to surround the tube through hole 231 while having a larger diameter than the tube through hole 231 in (230). Of course, the leak collection groove 232 is formed in each tube through hole 231, is formed on one surface of the leak detection panel 230 in contact with the tube sheet 220, for example to have a depth of about 3mm. . Here, the depth of the leak collection groove 232, the leak induction groove 233 and the first collection line 234 is the same or similar.

The leakage guide groove 233 is a groove for guiding the leakage cooling water collected in the leakage collection groove 232 to the first collection line 234. The leakage collection groove 232 includes a first collection line (232). 234 is formed on one surface of the leak detection panel 230 so as to be in direct communication with each other, or two or more leak-inducing grooves 233 are in communication with the first collection line 234. The leakage induction groove 233 connects a plurality of leakage collection grooves 232 while being vertically or inclined according to the location of the leakage induction groove 233 to flow the collected leakage cooling water to the first collection line 234. It is formed to. Leakage guide grooves 233 are in the form of an inclined straight line, for example, are formed to connect all of the leak collection grooves 232 on the straight line, the straight line is mutually disconnected and are disposed adjacent to each other continuously. In addition, the leak induction grooves 233 are made through a plurality of leak collection grooves 232 in the form of vertical and oblique lines as in the other embodiment of FIG. 7, and a plurality of mutual communication may be formed.

In addition, the first collection line 234 is a groove for concentrating the water leakage cooling water flowing along the leakage induction groove 233 connected to the plurality of leakage induction grooves 233 to a site that the pressure gauge 240 can measure. In the leak detection panel 230, a leak collection groove 232 is formed at an edge which is not formed. 6 shows an example formed vertically and horizontally in FIG. 6, but may be inclined instead of horizontally. In addition, at one end of the first collecting line 234, a pressure gauge 240 capable of measuring the pressure of the first collecting line 234 is installed, and from the first collecting line 234 to the second collecting line 235. A first valve 234a for discharging the leaked coolant that has not flowed is installed. Here, the first and second collection lines 234 and 235 collectively refer to pipes provided with a pressure gauge 240 and pipes provided with a second valve, including grooves formed in the leak detection panel 230.

Here, the pressure gauge 240 is a device that detects a pressure change in the first collecting line 234. In detail, the pressure gauge 240 measures the pressure of the leaked coolant flowing into the first collecting line 234. It is installed at one end or the middle point of the. Here, as an example, as shown in FIG. 6, the pressure gauge 240 may be installed in the first collecting line 234 separately from the second collecting line 235, and as another example, the second collecting line 235 may be a second valve. It may be installed before (235a). At this time, the second valve 235a replaces the function of the first valve 234a.

In addition, the second collection line 235 is formed by branching from the first collection line 234 to separately collect the leakage cooling water flowing into the first collection line 234 after the pressure is measured by the pressure gauge 240. . The second collection line 235 is provided with a second valve 235a such that the water leakage cooling water in the first collection line 234 flows into the second collection line 235 after the pressure measurement. Here, the second collection line 235 may be branched from the first collection line 234 separately from the pressure gauge 240, for example, or may be installed in connection with the pressure gauge 240 and the first valve 234a. have. At this time, the first valve 234a replaces the function of the second valve 235a.

The leak collection tank 250 is a member that separately collects the leak cooling water of the first collection line 234 through the second collection line 235, and an alarm of leakage occurs due to the pressure change measured by the pressure gauge 240. Afterwards, the leak cooling water discharged from the first collecting line 234 is installed to collect through the second collecting line 235. Here, the leakage cooling water of the leakage collection tank 250 may always store only a certain amount, may be completely discharged to the outside, and the stored leakage cooling water is used to extract the leakage point later. In addition, the leak collecting tank 250 is provided with a third valve 251 for discharging the leaked coolant to the outside, and a pump 252 is provided to reverse the leak coolant to extract the leak point. Of course, in addition to the leakage cooling water, the leakage collection tank 250 may accommodate colored liquids or gases, and may reverse the flow to extract the leakage points. At this time, the pump 252 flows back the fluid in the leak collection tank 250, so that the second collection line 235, the first collection line 234, the leakage induction groove 233, the leakage collection groove 232 and the tube The through-holes 231 are sequentially flowed to allow the tube sheet 220 and the tube 140 to be eluted at one or more leak points.

On the other hand, in another example of the heat exchanger 100 of the present invention, the pressure gauge 240, the second collection line 235 and the leakage collection tank 250, the leakage collection groove 232, the leakage induction groove ( 233) and the leakage cooling water introduced into the first collection line 234 is continuously discharged, and the leakage detection operation may be performed periodically or may be performed by detecting the leakage cooling water discharged from the first collection line 234. have. At this time, mixing between the leaked cooling water and the circulating fluid is prevented.

<Method>

8 is a block diagram illustrating the operation for leak detection and leak point extraction in a heat exchanger equipped with a leak detection apparatus according to the present invention. Here, the state in which the heat exchanger 100 is operating will be briefly mentioned. First, the cooling water flows into the water box 120 through the inside of the tube 140 after the cooling water flows into the one side water box 120 through the cooling water inlet unit 121, and the cooling water outlet unit 122. It is made to discharge through. In addition, the circulating fluid is converted into condensate while the steam discharged from the turbine is introduced into the body 110 through the circulating fluid inlet portion 111 and comes into contact with the surface of the tube 140 to exchange heat with the cooling water. The water is collected in the circulation fluid tank 130 and then supplied to the boiler through the circulation fluid outlet 131. Here, the circulating fluid is a term that collectively refers to steam and condensate, and has been described as steam and condensate as required for explanation.

When the coolant flows into the composite tube sheet 210 through the crack of the welded portion W of the tube 140 and the composite tube sheet 210 during operation of the heat exchanger 100, first, the tube The leakage cooling water flowing into the synthetic tube sheet 210 along the outer surface of the 140 is collected in the leakage collection groove 232 of the leakage detection panel 230 (S10).

Next, the leakage cooling water collected in the leakage collection groove 232 is collected in the first collection line 234 along the leakage induction groove 233 (S20).

Next, after the pressure gauge 240 measures the pressure change due to the leakage coolant on the first collection line 234, a leakage alarm is generated (S30).

Next, the second valve 235a is opened so that the water leakage cooling water of the first water collecting line 234 is collected in the water collecting tank 250 through the second water collecting line 235. Here, if necessary, the leakage cooling water collected near the pressure gauge 240 and not flowing to the second collection line 235 is discharged to the outside by opening the first valve 234a. In addition, after the leakage alarm is generated, the leakage cooling water caused by the leak continued until the worker is dispatched to stop the operation of the heat exchanger 100 is continuously collected in the leakage collection tank (250). Of course, since the leakage cooling water is collected into the leakage collection tank 250, mixing with the circulating fluid does not occur. In addition, the third valve 251 is operated such that only a predetermined amount of the leakage cooling water collected in the leakage collection tank 250 is stored or completely discharged.

Next, after the operation of the heat exchanger 100 is stopped by the operator and the water box 120 is separated from the body 110, the pump 252 connected to the leak collection tank 250 is operated, and the leak collection is performed. The fluid in the water tank 250 is flowed back to sequentially flow the second collection line 235, the first collection line 234, the leakage guide groove 233, the leakage collection groove 232, and the tube through hole 231. In order to elute at the weld site (W) of the tube sheet 220 and the tube 140, that is, the leak occurs, one or more leak points are extracted (S50).

Next, waterproofing is performed at the leak point (S60).

As described above, those skilled in the art will appreciate that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative and non-restrictive in all aspects. The scope of the present invention is clearly defined in the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and equivalents should be construed as being included in the scope of the present invention.

100 heat exchanger, 110 body,
120 water box, 130 fluid tank,
140 tubes, 200 leak detectors,
210 ... composite tube sheet, 220 ... tube sheet,
230 ... leak detection panel, 231 ... tube through hole,
232 Leak collection groove, 233 Leak induction groove,
234 ... the first collection line, 235 ... the second collection line,
240 ... pressure gauge, 250 ... water collection tank,
252 ... pump, W ... welded area.

Claims (12)

Body 110 having a tube 140 built-in in the inner space through which the circulating fluid enters, and is mounted on both sides of the body 110 to introduce or discharge the coolant that exchanges heat with the circulating fluid to the tube 140. In the heat exchanger provided with a water box 120,
Leakage detection device having a composite tube sheet 210 formed by coupling the tube sheet 220 and the leak detection panel 230 while being installed at both ends of the body 110 so that the end of the tube 140 passes through 200, and is made, and
The leak detection panel 230,
The tube sheet 220 to collect leakage coolant leaked through the composite tube sheet 210 along the gap between the tube 140 and the tube through hole 231 formed in the tube sheet 220. A plurality of leak collection grooves 232 formed to surround respective tube through holes 231 on one surface in contact with the c);
A plurality of leak-inducing grooves 233 formed in a predetermined length while communicating with the leak-collecting groove 232 to flow the leak-cooled water collected in the leak-collecting groove 232; And
The first water collecting line 234 is formed to communicate with the leak induction grooves 233 to collect the water cooling coolant flowing in the leak induction groove 233; heat transmitter. The method of claim 1,
The leak detection apparatus 200 detects the pressure change of the first collecting line 234 and measures the pressure change caused by the leak cooling water introduced into the first collecting line 234 to generate a leak alarm. The heat exchanger with a leak detection device, characterized in that further comprises a pressure gauge 240 installed on the first collecting line (234). The method of claim 1,
The heat exchanger having a leak detection device, characterized in that the first valve (234a) is installed on the first collection line (234) to discharge the leakage cooling water introduced into the first collection line (234). The method of claim 1,
The leak detection apparatus 200 includes a second collection line 235 branched from the first collection line 234 to separately collect the leakage cooling water introduced into the first collection line 234, and the second collection line 235. A heat exchanger having a leak detection device, characterized in that the water collection line (235) connected to the collecting line (235) is further included. 5. The method of claim 4,
The leak detection apparatus 200 is a liquid or gas for detecting the water contained in the leak collection tank 250 to flow back to the tube 140 and the tube sheet 220, one or more welds generated by the leak Heat exchanger with a leak detection device, characterized in that further comprises a pump 252 installed in the leak collection tank 250 to elute to the portion (W). 5. The method of claim 4,
A second valve 235a is installed on the second collecting line 235 to guide the leakage cooling water in the first collecting line 234 to the second collecting line 235, and the leakage collecting tank A heat exchanger having a leak detection device, characterized in that a third valve (251) is installed in the leak collection tank (250) to discharge the leak cooling water in the (250). The method of claim 1,
The leak guide groove 233 is in the form of an inclined straight line and is made through a plurality of the leak collection groove 232, the heat exchanger is provided with a leak detection device, characterized in that formed in a plurality of adjacent lines are mutually disconnected group. The method of claim 1,
The leak-inducing groove 233 is a heat exchanger having a leak detection device, characterized in that formed in the form of an inclined straight line and a plurality of the leak-collecting groove 232, a plurality of straight lines to communicate with each other. The method of claim 1,
A circulation fluid tank 130 mounted to the body 110 is further included to collect the circulation fluid discharged by heat exchange in the body 110.
The body 110 is provided with a circulating fluid inlet 111 for the inlet of the circulating fluid, each of the water box 120 is a cooling water inlet 121 or a cooling outlet for the inlet or outlet of the cooling water Part 122 is formed, the circulation fluid tank 130 is a heat exchanger having a leak detection device, characterized in that the circulation fluid outlet for the discharge of the circulation fluid 131 is formed. In the method for detecting a leak in the heat exchanger of claim 1,
When leakage occurs in the composite tube sheet 210 through cracks of the welded portion W of the tube 140 and the composite tube sheet 210, the leaked leakage coolant is leaked from each tube 140 in the leakage detection panel 230. The first step (S10) is collected in the leak collection groove 232 formed to surround the tube through hole 231 passing through; And
Leakage detection device characterized in that it comprises a; the second step (S20) is the water leakage cooling water collected in the leakage collection groove 232 is collected in the first collection line 234 along the leakage induction groove 233 Leakage detection method of the heat exchanger provided. The method of claim 10,
The first water collecting line 234 is a third step (S30) for generating an alarm after the pressure gauge 240 measures the pressure change due to the leaking coolant; Leak detection device further comprises a Leak detection method of used heat exchanger. The method of claim 10,
A fourth step (S40) in which the leak cooling water of the first collecting line 234 is collected into the leak collecting tank 250 through the second collecting line 235;
A fifth step (S50) of distilling the fluid in the leak collecting tank 250 by the pump 252 to elute the leaked one or more welded portions W to extract a leak point; And
6. The leak detection method of the heat exchanger having a leak detection device, further comprising a sixth step (S60) of performing a waterproof operation on the leak point.

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