KR101471456B1 - Fatigue testing apparatus for heat exchanger - Google Patents

Abstract

The present invention relates to a fatigue testing apparatus for a heat exchanger. The fatigue testing apparatus is provided with a fatigue testing control algorithm which performs fatigue testing for the heat exchanger in accordance with complex fatigue factors. The fatigue testing control algorithm performs the fatigue testing with respect to the pressure and temperature fatigue factors of the heat exchanger having a plurality of separated flow paths. The fatigue testing apparatus; a supply adjustment unit which supplies, pressurizes, circulates, and discharges a fluid, steam, or a low-temperature fluid with respect to the heat exchanger to perform the pressure or temperature fatigue inspection, and a control unit provided with the fatigue testing control algorithm; uses the fatigue testing control algorithm to control the supply adjustment unit. According to the present invention, pressure values of the first and second flow paths are monitored in real time such that first and second flow path leaks from a pressure fatigue load are detected or a temperature fatigue load is applied to the heat exchanger by supplying the steam and the low-temperature fluid in sequence to the first and second flow paths, and the fluid is supplied to monitor pressure from a temperature fatigue such that the first and second flow path leaks from the temperature fatigue load can be determined. Accordingly, the pressure and temperature fatigue testing for the heat exchanger can be automated.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a fatigue testing apparatus for a heat exchanger,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fatigue testing apparatus for a heat exchanger, and more particularly, to a fatigue testing apparatus for a heat exchanger for automatically inspecting a fatigue test according to internal pressure and temperature of a heat exchanger having a plurality of flow paths.

Generally, heat exchangers are frequently in contact with fluids such as liquids or gases containing various corrosive substances, and therefore are often deteriorated or damaged by chemical and / or physical factors. Heat exchangers can be damaged due to factors such as, for example, fatigue, including temperature, pressure, flow rate, vibration, and impact.

Such a heat exchanger corresponds to a pressure vessel in terms of structure, and is placed in an environment in which the pressure changes periodically or aperiodically depending on the operating environment. At this time, fatigue stress is generated and structural problems such as cracks are generated in the heat exchanger, and the fluid is mixed or leaked to the outside.

The heat exchanger is configured to perform indirect heat exchange between the heating fluid and the heating fluid with the heat transfer plate interposed therebetween. The heat exchanger also maintains the fluid tightness in a manufacturing process such as gasketing, welding, brazing, and diffusion bonding.

Therefore, during the operation of the heat exchanger, sudden fluctuations such as pressure and temperature should be avoided. This can damage the heat exchanger and cause leakage. The heat exchanger shall also minimize the transfer of pressure pulsations and vibrations from the installed pump or other equipment to the interior. If the pressure vibration is continuously transmitted to the heat exchanger, cracks may occur in the heat transfer plate due to the fatigue phenomenon.

However, even if the pressure pulsation or vibration is minimized, it is very difficult to completely block the fatigue factor only because there is a difference in the strength of the fatigue factor.

Therefore, the heat exchanger designers must determine the fatigue factor and the degree of fatigue that may occur during operation, and estimate the fatigue time or cycle.

However, due to the characteristics of the fatigue test, it is very difficult in practice to collect data while the operator operates it, since the repetitive pressure load of at least several thousands to several tens of thousands or more must be pressed and released or a temperature change must be applied . Therefore, there is a need for an automation technology for fatigue inspection according to the pressure and temperature changes of the heat exchanger. That is, the heat exchanger generates fatigue stress in response to pressure and / or temperature changes, which causes structural problems such as cracks in the heat exchanger. Therefore, there is a need for an apparatus for preventing these problems and verifying the stability of the product against fatigue load.

Techniques for heat exchangers to solve these problems have already been variously disclosed. For example, Korean Patent Application No. 10-0336131 (published on May 9, 2002) entitled " Leakage Test Apparatus and Inspection Method for Heat Exchanger ", Patent Registration No. 10-0931943 (Fifteenth), "Heat Exchanger Inspection Apparatus Using Guided Ultrasound" of the Patent Registration No. 10-0768390 (Oct. 18, 2007), and Patent Document 10 -1998-067286 (published October 15, 1998), and the like.

It is an object of the present invention to provide a fatigue testing apparatus for a heat exchanger for verifying the stability of a product according to a complex fatigue factor.

Another object of the present invention is to provide a fatigue test of a heat exchanger capable of automatically performing a fatigue test according to pressure and temperature changes.

It is still another object of the present invention to provide a fatigue testing apparatus for a heat exchanger for preventing structural problems due to fatigue stress, mixing of fluids and leakage of external fluid, and for verifying safety of products against fatigue load.

In order to achieve the above objects, a fatigue testing apparatus of a heat exchanger of the present invention is equipped with a fatigue test control algorithm for processing pressure and temperature fatigue tests, and is a feature of automatically processing a fatigue test for a flow path of a heat exchanger have. Such a fatigue testing apparatus of a heat exchanger prevents mixing and leakage of fluid according to the pressure and temperature fatigue stresses of the heat exchanger and verifies the stability of the product against fatigue load.

According to the feature, the apparatus for testing fatigue of a heat exchanger having a plurality of fluid passages separated from each other according to this feature is characterized in that a fluid is supplied from the fluid supply source storing the fluid to the fluid channels, A fluid supply unit for supplying the fluid to the fluid supply unit; A steam supply unit for generating steam at a high temperature to supply steam to the flow paths; A supply regulator for regulating the supply of the fluid or the low temperature fluid from the fluid supply unit or the supply of steam from the steam supply unit to selectively supply, pressurize, circulate and discharge the fluid or the steam to any one of the flow channels; Supplying and pressurizing fluid from the fluid supply unit to the flow paths to supply pressure or temperature fatigue of the heat exchanger or supplying steam from one of the flow paths to one of the flow paths, The steam is supplied to the heat exchanger, the steam is supplied to the heat exchanger, the steam is supplied to the heat exchanger, and the steam is supplied to the heat exchanger, And a controller for controlling the fluid regulator to detect the state of the fluid.

In one embodiment of this aspect, the heat exchanger has the flow paths as first and second flow paths; The supply regulator includes: A supply pump driven to supply and pressurize fluid or low temperature fluid from the fluid source to the first and second flow paths; A pressure regulator for keeping the pressure of the fluid supplied from the supply pump or the fluid at a low temperature constant; An automatic regulating valve for regulating the fluid supply path so as to supply fluid or low-temperature fluid supplied from the pressure regulator to the first or second flow path; A first temperature sensor for measuring the temperature of the inlet side of the second flow path; A second temperature sensor for measuring the temperature of the inlet side of the first flow path; A third temperature sensor for measuring the temperature of the outlet side of the first flow path; A fourth temperature sensor for measuring the temperature of the outlet side of the second flow path; A first pressure transmitter provided at one end of the first flow path and measuring a pressure value of the first flow path in real time; A second pressure transmitter disposed at one end of the second flow path and measuring a pressure value of the second flow path in real time; A first automatic shut-off valve provided at the other end of the first flow path to open or close the fluid to supply or block the fluid or the low temperature fluid to the first flow path; A second automatic shut-off valve provided at the other end of the second flow path to open or close the fluid to supply or block the fluid or the low temperature fluid to the second flow path; And a controller coupled to the first and second automatic shut-off valves to sense the fluid flow in the first or second flow path to determine a fluid supply completion time and pressure release of the first and second flow paths, 1 flow switch.

In another embodiment, the supply regulator comprises: A third automatic shutoff valve for supplying or blocking steam supplied from the steam supply unit to the first or second flow path; And a fourth automatic shutoff valve that recovers or cuts off steam discharged from the first or second flow path to the steam supply unit.

In another embodiment, the supply regulator comprises: A fifth automatic shutoff valve for discharging or shutting off a fluid or a low temperature fluid accommodated in the first flow path; A sixth automatic shutoff valve for discharging or shutting off the fluid contained in the second flow path; A discharge pump driven to discharge a fluid or a low-temperature fluid from the first and second flow paths; And a second flow switch for detecting the flow rate of the fluid discharged from the discharge pump or the flow rate of the low temperature fluid to determine the pressure release completion time and the completion time of the fluid supply.

In another embodiment, the supply regulator comprises: A first check valve for preventing back flow of fluid or low-temperature fluid supplied from the automatic regulating valve to the first flow path; A second check valve for preventing back flow of fluid or low-temperature fluid supplied from the automatic regulating valve to the second flow path; A first relief valve for discharging a fluid or a low temperature fluid so that the fluid pressure of the first flow path is adjusted when the fluid or the low temperature fluid is supplied to the first flow path at a pressure higher than the design pressure; And a second relief valve that discharges a fluid or a low-temperature fluid so that the fluid pressure of the second flow path is controlled when the fluid is supplied to the second flow path at a pressure higher than the design pressure or at a low temperature.

In another embodiment, the control unit is provided as a programmable logic controller; Wherein the programmable logic controller monitors the pressure values of the flow paths measured from the supply regulator to selectively supply fluid, low temperature fluid or steam to the flow paths at least once to detect leakage of the flow paths, And a fatigue test control algorithm for controlling the fatigue test.

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As described above, the fatigue testing apparatus of the heat exchanger according to the present invention is equipped with a supply control section and a fatigue test control algorithm for controlling the supply, pressurization and pressure of the fluid to the first and second flow paths of the heat exchanger , It is possible to automatically process the fatigue test procedures according to various fatigue loads of the heat exchanger.

Also, the fatigue testing apparatus of the heat exchanger of the present invention automatically processes the pressure and temperature fatigue testing processes of the heat exchanger, thereby minimizing the time and manpower consumption due to maintenance.

In addition, the present invention prevents the phenomenon that a fluid is mixed or leaked to the outside due to cracks or the like in the heat exchanger due to the pressure and temperature fatigue stress generated according to the operating environment and conditions of the heat exchanger by using the fatigue testing apparatus, The stability of the product against the load can be verified.

1 is a block diagram showing a configuration of a fatigue testing apparatus of a heat exchanger according to the present invention;
FIG. 2 is a view showing a part of a fatigue test apparatus according to an embodiment of the present invention shown in FIG. 1;
FIG. 3 is a diagram illustrating a configuration of a control unit according to an embodiment of the present invention shown in FIG. 1;
FIG. 4 is a flowchart showing a process procedure according to pressure and temperature fatigue tests of a fatigue testing apparatus of a heat exchanger according to an embodiment of the present invention; FIG.
FIG. 5 is a flowchart showing a processing procedure of a fluid supply step according to the pressure fatigue test shown in FIG. 4;
Fig. 6 is a flowchart showing the processing procedure of the pressing step shown in Fig. 4; Fig.
Figs. 7A and 7B are flowcharts showing the processing procedure of the pressure checking step shown in Fig. 4;
FIG. 8 is a flowchart showing the processing procedure of the steam supply step according to the temperature fatigue test shown in FIG. 4; FIG.
Fig. 9 is a flow chart showing the processing procedure of the low-temperature fluid circulation step shown in Fig. 4; Fig. And
10 is a flow chart showing the processing procedure of the fluid removal step shown in Fig.

The embodiments of the present invention can be modified into various forms and the scope of the present invention should not be interpreted as being limited by the embodiments described below. The present embodiments are provided to enable those skilled in the art to more fully understand the present invention. Therefore, the shapes and the like of the components in the drawings are exaggerated in order to emphasize a clearer explanation.

The present invention relates to an improved invention of a pressure fatigue testing apparatus for a heat exchanger and a pressure fatigue testing method thereof, which is disclosed in Korean Patent Application No. 10-2013-0074813 filed on June 27, 2013 by the present applicant.

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

1 is a block diagram showing the configuration of a fatigue testing apparatus of a heat exchanger according to the present invention.

Referring to FIG. 1, the fatigue testing apparatus 100 of the present invention includes a fatigue test control algorithm 104 for automatically checking the fatigue test of a heat exchanger according to various fatigue factors, for example, pressure and temperature. And the pressure and temperature fatigue testing process of the heat exchanger is processed using this.

To this end, the fatigue testing apparatus 100 of the present invention includes a control unit 102 that includes a fatigue test control algorithm 104 to control the pressure and temperature fatigue tests of the heat exchanger 10, a pressure and temperature fatigue test A fluid supply unit 110 for supplying fluid to the heat exchanger 10 and a steam supply unit 120 for supplying steam to the heat exchanger 10 for temperature fatigue test, Which supplies fluid or steam to the heat exchanger 10 from the supply unit 120 or regulates the supply of the fluid or steam from the heat exchanger 10 to the fluid supply unit 110 or the steam supply unit 120, An input unit 106 for inputting and setting various parameters for pressure and temperature fatigue testing to the control unit 102 and a control unit 102 for controlling the temperature of the heat exchanger 10 If an abnormality occurs, And a warning unit 108, indicating that the phase generation.

In the present invention, the heat exchanger (10) has a plurality of channels separated from each other. For example, the heat exchanger 10 has at least two separate flow paths, as shown in FIG. In this embodiment, the heat exchanger 10 is provided with first and second flow paths 12, 14.

The fluid supply unit 110 supplies the fluid stored in the fluid supply source to the heat exchanger 10 through the supply control unit 130 and pressurizes and circulates the supplied fluid and supplies the pressurized fluid to the heat exchanger 130 through the supply control unit 130. [ (10) and recovered as a fluid source. The fluid supply unit 110 is provided to supply a fluid of a predetermined temperature when inspecting the pressure fatigue of the heat exchanger 10 and to supply a fluid of a low temperature when inspecting thermal fatigue.

The steam supply unit 120 generates steam at a high temperature in order to increase the temperature of the heat exchanger 10 when the temperature of the heat exchanger 10 is tested for fatigue and supplies the steam to the heat exchanger 10 Supply.

The supply control unit 130 includes a plurality of sensors for measuring the pressure and temperature of the flow paths of the heat exchanger 10 under the control of the control unit 102 and a plurality of sensors for supplying the fluid from the fluid supply unit 110 and the steam supply unit 120 And a plurality of actuators for regulating the flow of the fluid and steam to regulate the fluid and steam to be supplied, pressurized, circulated and discharged to the flow path of the heat exchanger 10. [ The contents of the sensors and the actuators are described in detail in the embodiment of FIG.

The input unit 106 inputs and sets various parameters required for the pressure and temperature fatigue testing by the control unit 102. The input unit 106 may be provided in various forms according to the embodiment of the control unit 102. The input unit 106 is provided with a plurality of keypads, a software key or a key button, for example, and inputs to the control unit 102 the set values of various parameters required for pressure and temperature fatigue testing. Accordingly, the control unit 102 stores various parameters set from the input unit 106 in an internal memory (not shown). These parameters are accessed by the fatigue test control algorithm 104 of the control unit 102.

The warning unit 108 is provided, for example, with a speaker, an illuminating lamp, and a display device, and is controlled by the control unit 102 so that, when an abnormality occurs due to pressure and temperature fatigue tests, And generates alarm information to the outside informing that an abnormality has occurred. For example, the alarm information is provided by a warning sound, a warning light or a warning message.

The control unit 102 is provided with, for example, a controller, a programmable logic controller (PLC), a control unit, a control panel or a computer device, For example, the number of repetitions of the pressure and temperature fatigue tests, the initial pressure value for various actuators, and the driving time, etc., are set and stored in the internal memory.

In this embodiment, the control unit 102 is provided with a programmable logic controller (PLC) and stores in the internal memory (not shown) a fatigue test control algorithm 104 for pressure and temperature fatigue checking of the heat exchanger 160 do. This fatigue test control algorithm 104 is provided, for example, in a graphical user interface (GUI) based programming. The specific processes of the fatigue test control algorithm 104 according to the present invention will be described in detail with reference to FIGS.

Therefore, the fatigue testing apparatus 100 of the heat exchanger 10 of the present invention utilizes the fatigue test control algorithm 104 of the control unit 102 to calculate the structure of the heat exchanger 10 based on the complex fatigue stress, It is possible to prevent the problem of mixing of the fluid and the external leakage, and to verify the safety of the product against the fatigue load.

2 and 3, the configuration of a fatigue testing apparatus of a heat exchanger according to an embodiment of the present invention will be described in detail.

2 is a view showing a part of the configuration of the fatigue testing apparatus according to the embodiment of the present invention shown in FIG. 1, and FIG. 3 is a view showing the configuration of the control unit according to the embodiment of the present invention shown in FIG. 1 FIG.

2 and 3, the fatigue testing apparatus 100 of this embodiment includes a fluid supply unit 110, a steam supply unit 120, a supply control unit 110, A control unit 102, an input unit 106, and a warning unit 108. [0033]

First, the heat exchanger 10 is, for example, a plate heat exchanger. The heat exchanger 10 supplies fluids of different temperatures to a plurality of flow paths 12 and 14 separated from each other and flows a fluid between a plurality of heat transfer plates (not shown) And heat transfer is performed. The heat exchanger 10 of this embodiment is formed by stacking a plurality of heat transfer plates and has first and second flow paths 12 and 14 separated from each other inside the heat transfer plates. The first and second flow paths 12 and 14 are provided with the same standard for supplying, pressurizing, circulating and discharging fluid or steam at the same pressure. Of course, as another example, the heat exchanger 10 may have two or more flow paths that are separated from each other in accordance with a manufacturing standard.

The fluid supply unit 110 supplies the fluid at a predetermined temperature to the heat exchanger 10 for the pressure fatigue test of the heat exchanger 10. The fluid supply unit 110 supplies the low temperature fluid cooled to the predetermined temperature to the heat exchanger 10 for the temperature fatigue test of the heat exchanger 10. To this end, the fluid supply part 110 includes a fluid tank 112 and a cooler 114.

Fluid tank 112 is a source of fluid that either fills first and second flow paths 162 and 164 of heat exchanger 160 with a preliminary procedure for performing the pressure and temperature fatigue tests according to the present invention, Stores the fluid being pressurized for fatigue testing. The fluid tank 112 is provided as a water tank for storing safety fluid, for example, water, and supplies the stored water to the first heat exchanger 10 through the supply controller 130 Circulates, pressurizes, and recovers them to the first and second flow paths 12, 14, respectively. The cooler 114 receives the fluid from the fluid tank 112 for the temperature fatigue test of the heat exchanger 10 to cool it to a predetermined temperature and provides the cooled low temperature fluid to the fluid tank 112 again.

The steam supply unit 120 includes a steam boiler 122, a condensate tank 124 and a steam trap 126 to supply hot steam to the heat exchanger 10. [

The steam boiler 122 receives the fluid from the outside to generate the high temperature steam by heating the fluid and supplies the steam to the first and second flow passages 12 , 14). A condensate water tank 124 is connected to the heat exchanger 10 to reduce the cost associated with supplying the fluid, to improve the efficiency of the steam boiler 122, And supplies the stored condensed water to the steam boiler 122. The steam boiler 122 is connected to the steam boiler 122 via a steam line. Since the steam trap 126 includes condensed water generated as the temperature of the high temperature steam is lowered by the pipe of the supply control unit 130 or an apparatus such as an actuator, The condensed water contained in the steam discharged from the first and second flow paths 12 and 14 of the heat exchanger 10 is discharged to the condensate tank 124 and the steam is discharged without discharging it. This steam trap 126 can improve the thermal efficiency of the steam supplied, circulated and recovered from the steam boiler 122.

The supply control unit 130 is provided between the fluid supply unit 110 and the steam supply unit 120 and the heat exchanger 10. The supply control unit 130 controls the flow of the fluid or steam supplied to the first and second flow paths 12 and 14 of the heat exchanger 10 under the control of the control unit 102, (12, 14) in real time and provides them to the control unit (102).

The supply controller 130 may include a plurality of sensors 136, 142, 146, 148, 162 and 168 and a plurality of actuators 132, 134, 138, 140, 144, 150 to 158, 160, 166, 170, 172, 174). For example, the sensors are provided with first to fourth temperature sensors 136, 146, 148, 162 for respectively measuring the temperatures of the first and second flow paths 12, 14 in the temperature fatigue test, And first and second pressure transmitters (142, 168) respectively measuring pressures of the first and second flow paths (12, 14). Each of the sensors 136, 142, 146, 148, 162, 168 measures the temperature or pressure of the first or second flow path 12 or 14 under the control of the control unit 102, TC1 to TC4 or pressure values PT1 and PT2 to the control unit 102, respectively.

The actuators include pumps 132 and 172, valves 134, 138, 140, 144, 150 to 158, 164, 166 and 170 and flow switches 160 and 174. Each of the actuators 132, 134, 138, 140, 144, 150 to 158, 160, 164, 166, 170, 172 and 174 is driven or opened under the control of the controller 102.

Specifically, the supply regulator 130 includes a fluid supply line 190 for supplying and pressurizing the fluid from the fluid supply unit 110 to the heat exchanger 10, First and second supply branch lines 192 and 194 branched to one end of each of the first and second flow paths 12 and 14 and connected to the other ends of the first and second flow paths 12 and 14, First and second fluid discharge lines 196 and 198 for discharging the fluid contained therein from each of the first and second fluid discharge lines 196 and 196 and the first and second fluid discharge lines 196 and 198, A first fluid recovery line 200 for withdrawing fluids from the fluid discharge lines 196 and 198 to the fluid supply 110 and a second fluid return line 190 for transferring fluid from the fluid supply line 190 to the fluid supply 110 via the pressure regulator 134 A second fluid recovery line (208) for recovering the fluid; a second fluid recovery line (208) connected to the other end of the first flow path (12) for discharging a fluid contained in the first flow path A fourth fluid discharge line 210 connected to one end of the second flow path 14 for discharging the fluid contained in the second flow path 14, And a fourth fluid withdrawal line 212 connected to the second fluid withdrawal line 206, 210 to withdraw fluids from the third and fourth fluid withdrawal lines 206, 210 to the fluid supply section 110.

The supply control unit 130 includes a steam supply line 202 for supplying high temperature steam from the steam supply unit 120 to one end of the first or second flow path 12 or 14, 12 or 14) for discharging the steam contained therein from the first or second flow path (12 or 14). In this embodiment, one steam supply line 202 for supplying steam to the first flow path 12 and one steam discharge line 204 for discharging steam from the first flow path 12 are provided, And a steam supply line (not shown) and a steam discharge line (not shown) for supplying steam to the two flow paths 14 or discharging the steam from the second flow path 14.

The fluid supply line 190 is provided with a supply pump 132 driven to supply and pressurize the fluid from the fluid tank 112 to the first and second flow paths 12 and 14, A pressure regulator 134 that keeps the pressure constant, and a pressure regulator 134 that is provided between the fluid supply line 190 and the first and second supply branch lines 192 and 194, An automatic three-way valve 138 for switching the fluid supply path to supply the fluid to the supply branch lines 192 and 194 and an automatic three-way valve 138 provided between the pressure regulator 134 and the automatic regulating valve 138, And a first temperature sensor (a thermocouple) 136 for measuring the temperature at one end of the second flow path 14, that is, the inlet side of the first flow path 12, in the fatigue test.

The supply pump 132 is turned on and off by receiving the control signal P1 of the control unit 102. [ The supply pump 132 supplies and pressurizes the fluid from the fluid tank 112 to the first and second flow paths 12, 14 of the heat exchanger 10.

The pressure regulator 134 is a pressure regulating valve that receives the control signal PR1 of the control unit 102 and controls the pressure of the first and second flow paths 12 and 14 to be constant according to the set pressure input by the input unit 106 So that the fluid can be pressurized. The pressure regulator 134 transmits the pressure information PR2 automatically controlled by the control unit 102. [ In addition, the pressure regulator 134 is provided with a second fluid recovery line 208 to recover the fluid to the fluid tank 112.

The first temperature sensor 136 measures the inlet side temperature of the second flow path 14 and transmits the measured temperature information TC1 to the control unit 102 during the temperature fatigue test.

The automatic regulating valve 138 regulates the supply direction of the fluid so as to supply the fluid to the first flow path 12 or the second flow path 14. In other words, the controller 102 receives the control signal V1_1 from the controller 102 to adjust the fluid supply direction to the first or second flow path 12 or 14. Further, the automatic control valve 138 transmits the open / close state information V1_2 according to the currently adjusted supply direction to the control unit 102. [

The first supply branch line 192 is provided with a first check valve 140 for preventing the backward flow of the fluid supplied to the first flow path 12, A first pressure relief valve 144 for automatically discharging the fluid when the pressure of the first flow path 12 is higher than a predetermined pressure, In the test, a second temperature sensor 146 for measuring the inlet-side temperature of the first flow path 12 is provided.

The first pressure transmitter 142 measures the pressure of the first flow path 12 in real time and transmits the measured pressure information PT1 to the control unit 102. The second temperature sensor 146 measures the inlet side temperature of the first flow path 12 and transmits the measured temperature information TC2 to the control unit 102 during the temperature fatigue test.

The second supply branch line 194 is provided with a second check valve 164 for preventing the backward flow of the fluid supplied to the second flow path 14 and a second pressure transmitter for measuring the pressure of the second flow path 14 And a second relief valve 170 for automatically discharging the fluid when the pressure of the second flow path 14 is higher than a predetermined pressure. The second supply branch line 194 branches the fourth fluid discharge line 210 between the second check valve 164 and the second pressure transmitter 168. The second pressure transmitter 168 measures the pressure of the second flow path 14 in real time and transmits the measured pressure information PT2 to the control unit 102.

The first fluid discharge line 196 includes a first automatic shut-off valve 156 for maintaining and releasing the pressure of the first flow path 12 and for discharging the gas contained in the fluid, The second fluid discharge line 198 is provided with a second automatic shutoff valve 158 for maintaining and releasing the pressure of the second flow path 14 and discharging the gas contained in the fluid, And a fourth temperature sensor 162 for measuring the temperature on the outlet side of the heat exchanger 14. Each of the first and second automatic shutoff valves 156 and 158 is opened and closed by receiving the control signals V2 and V3 of the control unit 102. [ The fourth temperature sensor 162 measures the temperature at the outlet side of the second flow path 12 and transmits the measured temperature information TC4 to the control unit 102 during the temperature fatigue test.

A flow rate of the fluid recovered to the first fluid recovery line 200 is detected between the first and second fluid discharge lines 196 and 198 and the first fluid recovery line 200, A first flow switch 160 for determining the timing is provided. The first flow switch 160 detects the flow rate of the fluid recovered to the first fluid recovery line 200 and transmits the flow rate information FS1 detected by the controller 102. Accordingly, the control unit 102 receives the flow rate information FS1 to determine the pressure release completion time and the fluid supply completion time.

Fifth and sixth automatic shutoff valves 154 and 166 are provided in each of the third and fourth fluid discharge lines 206 and 210 to discharge or block the fluid contained in the first and second flow paths 12 and 14. [ Respectively. The third fluid discharge line 206 is provided with a third temperature sensor 148. The third temperature sensor 148 measures the temperature of the outlet side of the first flow path 12 and transmits the measured temperature information TC3 to the control unit 102 during the temperature fatigue test. Each of the fifth and sixth automatic shutoff valves 154 and 166 is opened and closed by receiving the control signals V6 and V7 of the control unit 102. The third and fourth fluid discharge lines 206, 210 are connected by a fourth fluid return line 212.

The fourth fluid recovery line 212 is provided with a discharge pump 172 driven to discharge fluid contained in the first and second flow paths 12 and 14 from the third and fourth fluid discharge lines 206 and 210, And a second flow switch 174 is provided to detect the flow rate of the fluid discharged to the fourth fluid recovery line 212 to determine the pressure release completion timing and the completion timing of the fluid supply. The discharge pump 172 is driven by receiving the control signal P2 of the control unit 102. [ The second flow switch 174 detects the flow rate of the fluid discharged to the fourth fluid recovery line 212 and transmits the detected flow rate information FS2 to the control unit 102.

The steam supply line 202 is connected between the steam boiler 122 and the first check valve 140 of the first supply branch line 192 and the first pressure transmitter 142. The steam supply line 202 receives the control signal V4 of the control unit 102 and supplies the steam to the first or second flow path 12 or 14, A shut-off valve 150 is provided.

The steam discharge line 204 is connected between the steam boiler 122 and the third temperature sensor 148 of the third fluid discharge line 206 and the fifth automatic shutoff valve 154. A steam discharge line 204 is provided with a condensate tank 124, a steam trap 126 and a fourth automatic shutoff valve 152. The fourth automatic shutoff valve 152 receives the control signal V5 of the control unit 102 and opens or closes the steam to remove or cut off the steam discharged from the first flow path 12 into the steam boiler 122.

The control unit 102 processes the fatigue test control algorithm 104 to supply the fluid from the fluid tank 112 to the first and second flow paths 12 and 14 of the heat exchanger 10 during the pressure fatigue test, And controls the supply regulator 130 to circulate. The control unit 102 controls the supply control unit 130 to supply and circulate steam from the steam boiler 122 to the first or second flow paths 12 and 14 of the heat exchanger 10 during the temperature fatigue test A second or first flow path 14 or 12 from the fluid tank 112 to the opposite side of the first or second flow path 12 or 14 to which the steam is supplied in order to apply a fatigue load depending on the temperature, To pressurize and circulate the fluid. The control unit 102 controls the supply control unit 130 to completely remove the low temperature fluid from the first and second flow paths 12 and 14 and controls the supply of the fluid to the first and second flow paths 12 and 14 Pressurize, and circulate the pressures of the first and second flow passages 12 and 14 to monitor the pressure change of the first and second flow passages 12 and 14.

That is, the control unit 102 receives the pressure information PT1 and PT2 of the first and second flow paths 12 and 14 measured by the supply control unit 130 and controls the first and second flow paths 12 and 14, Circulating and discharging the steam and the low temperature fluid sequentially to the first and second flow paths 12 and 14 so as to apply the fatigue load according to the temperature and to apply the fatigue load corresponding to the temperature to the first and second flow paths 12 And 14 via the pressure information PT1 and PT2 of the first and second flow paths 12 and 14 measured from the supply control unit 130 by supplying, 12, and 14 are detected to determine whether there is an abnormality.

The control unit 102 controls the warning unit 108 to notify the outside of the first and / or second flow paths 12 and 14 when an abnormality occurs in the first and / or second flow paths 12 and 14 as a result of the processing of the fatigue test control algorithm 104.

As described above, the fatigue testing apparatus 100 of the present invention controls the supply control unit 130 through the fatigue test control algorithm 104 stored in the control unit 102, The first or second flow path 12 or 14 is filled with fluid or steam and the first or second flow path 12 or 14 is selectively pressurized by a predetermined number of times or a temperature fatigue load is applied, And detects abnormality according to pressure and temperature fatigue of the first and second flow paths (12, 14) by monitoring pressure change in real time.

Therefore, the pressure fatigue testing apparatus 100 of the present invention can be implemented by using a control unit 102 including a supply control unit 130 having a plurality of sensors and actuators and a fatigue test control algorithm 104, The pressure and temperature fatigue testing procedures for the first and second flow paths 12 and 14 of the first and second flow paths 10 and 10 can be automatically handled.

FIG. 4 is a flowchart showing a processing procedure according to pressure and temperature fatigue testing of a fatigue testing apparatus of a heat exchanger according to an embodiment of the present invention.

Referring to FIG. 4, the heat exchanger fatigue testing apparatus 100 according to the present invention inputs and sets various parameters in step S300 to process the pressure fatigue test and the temperature fatigue test. The parameters are input to the control unit 102 through the input unit 106. These parameters are the parameters that must be processed in the pressure fatigue test control algorithm 105 and are the values necessary to configure the sequence of the program according to the pressure and temperature fatigue test procedure.

In this embodiment, the parameters are variously set according to the design pressure of the heat exchanger 10 when designing the heat exchanger 10. For example, the parameters include the set (or target) pressure SP1, the steam set pressure SP2, the set steam temperature ST, and the pressure test hold time (for example, The sub cycle number SC for setting the number of times of pressing the first and second flow paths 12 and 14 and the number of sub cycles SC for setting the first and second flow paths 12 and 14, The total cycle number TC for setting the number of pressure and temperature inspections of the first and second flow paths 14 and 14 and the allowable pressure drop amount for setting the pressure value of the tolerance range for the pressure values of the first and second flow paths 12 and 14 (AP) and the like. At this time, the fluid supply control unit 110 maintains all the components 112 to 134 off.

In step S302, it is selected whether the heat exchanger 10 is to be subjected to the pressure fatigue test or the temperature fatigue test. If the pressure fatigue test is selected in step S302, the flow advances to step S310 to process a process for filling fluid in the heat exchanger 10 as a preliminary procedure for the pressure fatigue test and the pressure test. That is, in the fluid supply step S310, the control unit 102 controls the supply control unit 130 so that any one of the first and second flow paths 12 and 14 of the heat exchanger 10 from the fluid supply unit 110 And sequentially supplies the fluid to the other flow path.

In step S330, the control unit 102 pressurizes and releases the pressure for the set number of cycles until the set (target) pressure SP1 is reached, for the actual pressure fatigue test. At this time, the pressurization step S330 is a full-scale fatigue test procedure, which pressurizes and releases the fluid during the set number of sub cycles SC and the total number of cycles TC. When the pressure values of the first and second flow paths 12 and 14 reach the set (target) pressure SP1 in the pressing step S330, the pressure is immediately released. In this embodiment, the first and second flow paths 12 and 14 are pressurized by the set number of sub cycles SC to determine whether an abnormality occurs before reaching the set pressure SP1, and the pressure is released.

Subsequently, the pressure inspection is performed in step S360. That is, in step S360, a pressure change for detecting whether or not there is an abnormality in the first and second flow paths 12 and 14 is monitored to check whether leakage occurs in the first and second flow paths 12 and 14. At this time, the pressure of the first and second flow paths 12 and 14 is inspected for a predetermined period of time to determine whether the pressure of the heat exchanger 10 is fatigued. For this, in the pressure test step S360, the pressure change amount is checked while maintaining the pressure of the first and second flow paths 12, 14 at the set pressure SP1 during the set pressure test holding time HT, Lt; / RTI >

In the pressure fatigue test method of the present invention, since the pressure is released immediately after reaching the set (target) pressure SP1 when the first and second flow paths 12 and 14 are pressed, It is difficult to check whether or not the first and second flow paths 12 and 14 are leaking. Therefore, in the pressure inspection step (S360), which is performed after the pressurization step (S330), it is repeatedly performed a predetermined number of times to check whether the first and second flow paths (12, 14) are leaking.

Here, in the pressure inspection step S360, the pressure is not released immediately after reaching the target (target) pressure SP1 in order to determine a minute leak, but the pressure The difference between the initial pressure value and the pressure value measured in real time after the pressure SP1 is reached is calculated and the micro leak is determined by comparing the pressure value with the allowable pressure drop AP using this difference value.

If the temperature fatigue test is selected in step S302, the procedure goes to step S400 to supply steam to the first or second flow path 12 or 14 to raise the temperature of the heat exchanger 10. In step S420, The low-temperature fluid is supplied to the second or first flow path 14 or 12 opposite to the first or second flow path 12 or 14 to which the steam is supplied to lower the temperature of the heat exchanger 10, Circulate. This low-temperature fluid circulation step S420 is for applying a thermal fatigue load to the heat exchanger 10. [ Thus, the heat exchanger 10 circulates the low-temperature fluid and is sufficiently cooled to the original temperature. In step S440, the fluid is removed as a preliminary procedure for raising the temperature of the heat exchanger 10 again. The procedure of steps S400 to S440 is repeatedly performed during the set number of sub cycles SC in step S460.

In step S470, the fluid is supplied to the first and second flow paths 12 and 14 to check whether the heat exchanger 10 subjected to the thermal fatigue load is abnormal, and the pressure is inspected in step S480. The fluid supply step S470 and the pressure inspection step S480 are performed in the same manner as the fluid supply step S310 and the pressure inspection step S360 in the pressure fatigue inspection. Then, the procedure from step S400 to step S480 is repeatedly performed during the total number of cycles TC set in step S490.

5 through 7, the processing steps S310 through S360 according to the pressure fatigue test of the present invention will be described, and the processing according to the temperature fatigue test according to the present invention (steps S400 through S360) S490) will be described in detail.

5 is a flowchart showing the processing procedure of the fluid supply step S310 according to the pressure fatigue test shown in FIG. 4, and FIG. 6 is a flowchart showing the processing procedure of the pressurization step S330 shown in FIG. And FIGS. 7A and 7B are flowcharts showing the processing procedure of the pressure inspection step shown in FIG. These procedures are performed by a fatigue test control algorithm 104 stored in the control unit 102 of the fatigue testing apparatus 100. The fatigue test control algorithm 104 is processed under the control of the control unit 102. [

Referring to FIG. 5, the fluid supply step S310 supplies fluid to the first flow path 12 in step S312. That is, the control unit 102 outputs the control signals P1, PR1, V1_1, V2 and V3 to open the automatic regulating valve 138 to the first flow path 12 side and the first automatic shut- And the second automatic shut-off valve 158 is closed to discharge the internal air of the first flow path 12. At this time, the pressure regulator 134 is opened to the heat exchanger 10 by 100%. Subsequently, the supply pump 132 is turned on to supply the fluid from the fluid tank 112 to the first flow path 12 of the heat exchanger 10.

In step S314, the flow of the first flow path 12 is sensed through the first flow switch 160 to determine whether the first flow path 12 is filled with fluid. The first flow switch 160 does not operate when air escapes, and senses a fluid, that is, a liquid having a high density, when it passes, and transmits the detection signal FS1 to the controller 102. [ Accordingly, when the control unit 102 receives the detection signal FS1 from the first flow switch 160, the control unit 102 recognizes that the fluid is full in the first flow path 12 and stops the supply of the fluid to the first flow path 12 .

The automatic regulating valve 138 is opened to the second flow path 14 side to supply the fluid to the second flow path 14 in step S316. That is, the control unit 102 drives the pump 132 through the control signals P1, V2, and V3 and turns on the second automatic shutoff valve 158 while the first automatic shutoff valve 156 is opened. Lt; / RTI >

At this time, opening the first and second automatic shutoff valves 156 and 158 at the same time is advantageous in that the first flow path 12 and the second flow path 14 are connected to the heat transfer plate (not shown) due to the structural characteristics of the heat exchanger 10, But the heat transfer plate is minutely moved (or deformed) by the pressure of the first flow path 12 and the second flow path 14, respectively. That is, when the fluid is supplied to the second flow path 14 and the pressure is applied, the heat transfer plate is pushed toward the first flow path 12 and is finely moved. Therefore, when the first automatic shutoff valve 156 is closed, The pressure of the first and second flow paths 12 and 14 increases together with the heat transfer plate 12 which is moved by the pressure of the second flow path 14 as a closed circuit.

Therefore, even if the pressure of the second flow path 14 reaches the set pressure SP1, due to the balance principle of the force, the maximum load can not be actually applied due to the pressure raised together with the first flow path 12. [ Thus, when the first heat exchanger plate is deformed by applying pressure to the second flow path 14 in a state of being opened without closing the first automatic shutoff valve 156, the fluid overflows through the first automatic shutoff valve 156 as smoothly as natural So that the maximum load is applied to the second flow path 14. Of course, the same process is performed when the second flow path 14 is pressurized and when the first flow path 12 is pressurized.

Subsequently, in step S318, the flow of the second flow path 14 is sensed through the first flow switch 160 to determine whether the second flow path 14 is filled with fluid. As a result of the determination, when the control unit 102 receives the detection signal FS1 from the first flow switch 160, the controller 102 recognizes that the fluid is full in the second flow path 14. Therefore, the first and second flow paths 12 and 14 are filled with the fluid.

Although the fluid is supplied to the first flow path 12 and then the fluid is supplied to the second flow path 14 in this embodiment, the fluid is supplied to the first flow path 12 and the second flow path 14, The order may be changed.

Referring to FIG. 6, the pressurization step S330 is controlled by the control unit 102 to pressurize and relieve the pressure fatigue test procedure for a set number of times. For this, the controller 102 closes the second automatic shut-off valve 158 so that the second flow path 14 is pressed when the fluid is filled in the second flow path 14 in step S318.

Specifically, in step S332, the second flow path 14 is first pressed. That is, the control unit 102 drives the supply pump 132 via the control signals P, V1_1, V2, and V3, and opens the automatic control valve 138 to the second flow path 14 side , The first automatic shut-off valve 156 is opened and the second automatic shut-off valve 158 is closed to pressurize the second flow path 14. The first automatic shut-off valve 156 is opened when the pressure of the first flow path 12 is lower than that of the second flow path 12 as the first and second flow paths 12 and 14 are deformed in the heat exchanger 10, It is possible to influence the pressure change of the flow path 14.

Therefore, since the second flow path 14 is closed, the pressure gradually rises. At this time, the second pressure transmitter 168 measures the pressure value PT2 of the second flow path 14 in real time. When the pressure of the second flow path 14 begins to gradually approach the set pressure SP1, the pressure regulator 134 is automatically adjusted to open slightly to the second fluid return line 208, By adjusting the ratio of the amount of the fluid flowing into the second flow path 14, the set pressure value is kept constant.

The control unit 102 receives the pressure value PT2 of the second flow path 14 measured from the second pressure transmitter 168 and detects the abnormality of the second flow path 14 in step S334. In this embodiment, when the pressure value PT2 of the second flow path 14 is maintained within the allowable pressure drop AP while the elapsed time TP from the start of the pressurization is the allowable pressurization time TA, It is determined that there is no abnormality in the flow path 14 and the process proceeds to step S338. Otherwise, it is determined that an abnormality such as leakage occurs in the second flow path 14, and the process proceeds to step S336.

In step S336, the control unit 102 turns off the supply pump 132 through the control signals P, V2, and V3, opens the first and second automatic shutoff valves 156 and 158, 14 and releases alarm information indicating the abnormal state of the second flow path 14 to the warning unit 108. [ At this time, opening the first automatic shut-off valve 156 together with the second automatic shut-off valve 158 also prevents the first and second flow passages 12, 14 from affecting mutual pressure changes in the heat exchanger 10 In order to prevent it from being damaged.

In step S338, if there is no abnormality in the second flow path 14, it is determined whether or not the pressure value PT2 of the second flow path 14 reaches the set pressure SP1. As a result of the determination, if the pressure value PT2 of the second flow path 14 reaches the set pressure SP1, the procedure goes to step S340 to open the second automatic shutoff valve 158 to open the second flow path 14 Lt; / RTI > If the pressure value PT2 of the second flow path 14 does not reach the set pressure SP1, the procedure proceeds to step S332 to continuously pressurize the second flow path 14. [

In step S342, the control unit 102 drives the supply pump 132 using the control signals P, V1_1, V3, and V2, and sets the automatic control valve 138 to the first flow path 12 side 100% In the opened state, the second automatic shut-off valve 158 is opened and the first automatic shut-off valve 156 is closed to press the first flow path 12. At this time, the first pressure transmitter 142 measures the pressure value PT1 of the first flow path 12 in real time. Further, when the pressure of the first flow path 12 begins to gradually approach the set pressure SP1, the pressure regulator 134 automatically adjusts to open gradually to the second fluid return line 208, , And the ratio of the amount of the fluid flowing into the first flow path 12 is regulated so that the set pressure value is maintained constant.

The control unit 104 receives the pressure value PT1 of the first flow path 12 measured from the first pressure transmitter 142 so that the pressure value PT1 of the first flow path 12 reaches the set pressure SP1), and detects the presence or absence of an abnormality in the first flow path 14. In this embodiment, if the pressure value PT1 of the first flow path 12 is maintained within the allowable pressure drop AP while the elapsed time TP from the start of the pressurization is the allowable pressurization time TA, It is determined that there is no abnormality in the flow path 12, and the process proceeds to step S348. Otherwise, it is determined that an abnormality such as leakage occurs in the first flow path 12, and the process proceeds to step S346.

In step S346, the control unit 102 turns off the supply pump 132 through the control signals P, V2, V3 and opens the first and second automatic shutoff valves 156, 12 and releases alarm information indicating the abnormal state of the first flow path 1 to the warning unit 108. [

In step S348, if there is no abnormality in the first flow path 12, it is determined whether or not the pressure value PT1 of the first flow path 12 reaches the set pressure SP1. As a result of the determination, if the pressure value PT1 of the first flow path 12 reaches the set pressure SP1, the procedure goes to step S350 to open the first automatic shutoff valve 156 to open the first flow path 12 Lt; / RTI > If the pressure value PT1 of the first flow path 12 does not reach the set pressure SP1, the procedure goes to step S342 to continuously pressurize the first flow path 12. [

Subsequently, in step S352, it is determined whether the number of times the first and second flow paths 12 and 14 are pressed satisfies the set number of sub cycles SC. As a result of the determination, if the set number of sub-cycles SC is not satisfied, steps S332 to S350 are repeatedly performed until the set number of sub-cycles SC is satisfied, and the second and first flow paths 14 and 12 are sequentially Pressure. Here, the sub-cycle SC is defined as 'one sub-cycle' when the processes of pressurizing the fluid to the first and second flow paths 12 and 14 are performed once, and the number of sub- 102). ≪ / RTI >

As a result of the determination, if the accumulated number of sub-cycles satisfies the set number of sub-cycles (SC), the procedure advances to step S360 to process the pressure inspection step (S360). The pressure inspection step (S360) of this embodiment is processed in a manner similar to the pressurization step (S330), but is processed to be maintained for a set constant time. In the pressure checking step S360, the initial pressure values for the first and second flow paths 12 and 14 and the pressure values PT1 and PT2 transmitted in real time from the first and second pressure transmitters 142 and 168, PT2) is calculated and compared with the set pressure SP1. When the comparison value exceeds the set pressure SP1, it is judged as a leak.

7A, the pressure checking step S360 of this embodiment drives the supply pump 132 through the control signals P, V1_1, V2 and V3 in step S362, and controls the automatic regulating valve 138 The first automatic shut-off valve 156 is opened, and the second automatic shut-off valve 158 is closed to press the second flow path 14. At this time, the second pressure transmitter 168 measures the pressure value PT2 of the second flow path 14 in real time.

In step S364, the control unit 102 receives the pressure value PT2 of the second flow path 14 measured from the second pressure transmitter 168, and detects the abnormality of the second flow path 14 during the pressurization. That is, when the pressure value PT2 of the second flow path 14 is maintained within the allowable pressure drop amount AP while the elapsed time TP after the start of pressure is equal to the allowable pressurization time TA , It is determined that there is no abnormality in the second flow path 14, and the flow proceeds to step S368. Otherwise, it is determined that an abnormality such as leakage occurs in the second flow path 14, and the flow advances to step S366.

In step S366, the control unit 102 turns off the supply pump 132 via the control signals P, V2, and V3, opens the first and second automatic shutoff valves 156 and 158, 14 and releases alarm information indicating the abnormal state of the second flow path 14 to the warning unit 108. [

However, if there is no abnormality in the second flow path 14 during pressurization, it is determined in step S368 whether the pressure value PT2 of the second flow path 14 reaches the set pressure SP1. As a result of the determination, if the pressure value PT2 of the second flow path 14 does not reach the set pressure SP1, the procedure proceeds to step S362 to continuously pressurize the second flow path 14. [

As a result of the determination, when the pressure value PT2 of the second flow path 14 reaches the set pressure SP1, the operation of the supply pump 132 is stopped, the steps S370 and S374 are sequentially performed, It is determined whether the pressure value PT2 of the second flow path 14 maintains the set pressure SP1 during the holding time HT. As a result of the determination, if the pressure value PT2 of the second flow path 14 does not maintain the set pressure SP1 during the pressure test holding time HT, the process proceeds to step S372 to release the pressure of the second flow path 14 And transmits alarm information indicating the abnormal state of the second flow path 14 to the warning unit 108. [

As a result of the determination in step S374, if the pressure value PT2 of the second flow path 14 maintains the set pressure SP1 during the pressure test holding time HT, the procedure proceeds to step S376, (HT), the pressure of the second flow path 14 is released. As a result, the pressure fatigue test for the second flow path 14 is completed once.

7B, when the pressure fatigue test for the second flow path 14 is completed, the first flow path 12 is pressed in step S278. That is, the supply pump 132 is turned on via the control signals P, V1_1, V2 and V3, the automatic regulating valve 138 is opened to the first flow path 12 side, 158, and the first automatic shut-off valve 156 is closed to pressurize the first flow path 12. At this time, the first pressure transmitter 142 measures the pressure value PT1 of the first flow path 12 in real time.

In step S380, the control unit 102 receives the pressure value PT1 of the first flow path 12 measured from the first pressure transmitter 142, and detects the abnormality of the first flow path 12 during the pressurization. That is, when the pressure value PT1 of the first flow path 12 is maintained within the allowable pressure drop amount AP while the elapsed time TP after the start of pressure is equal to the allowable pressurization time TA , It is determined that there is no abnormality in the first flow path 12, and the flow proceeds to step S384. Otherwise, it is determined that an abnormality such as leakage occurs in the first flow path 12, and the flow advances to step S382.

In step S382, the control unit 102 turns off the supply pump 132 and opens the first and second automatic shutoff valves 156 and 158 through the control signals P, V2 and V3, The control unit 10 releases the pressure of the one channel 12 and transmits alarm information to the warning unit 108 indicating the abnormal state of the first flow path 12. [

However, if there is no abnormality in the first flow path 12 during pressurization, it is determined in step S384 whether the pressure value PT1 of the first flow path 12 reaches the set pressure SP1. As a result of the determination, if the pressure value PT1 of the first flow path 12 does not reach the set pressure SP1, the procedure goes to step S378 to continuously pressurize the first flow path 12.

As a result of the determination, when the pressure value PT1 of the first flow path 12 reaches the set pressure SP1, the pump operation is stopped. Subsequently, the procedure advances to step S386 to determine whether the pressure value PT1 of the first flow path 12 maintains the set pressure SP1 during the pressure test holding time HT in step S390. As a result of the determination, if the pressure value PT1 of the first flow path 12 does not maintain the set pressure SP1 during the pressure test holding time HT, the process advances to step S388 to set the pressure of the first flow path 12 to And generates alarm information indicating an abnormal state of the first flow path 12.

As a result of the determination in step S390, if the pressure value PT1 of the first flow path 12 maintains the set pressure SP1 during the pressure test holding time HT, the procedure proceeds to step S392, 12). If not, the flow advances to step S386 to check whether there is an abnormality with respect to the first flow path 12 while the pressure test holding time HT is satisfied. As a result, the pressure fatigue test for the first flow path 12 is completed once.

Then, in step S394, it is determined whether the accumulated pressure check number for the first and second flow paths 12, 14 satisfies the set total cycle count TC. As a result of the determination, if the cumulative number of times of pressure inspection does not satisfy the set total cycle count TC, the procedure proceeds to step S332, and the pressure step S330 and the pressure inspection step S360 are performed to set the total number of times TC Repeat until satisfied. As a result, all the pressure fatigue tests on the first and second flow paths 12 and 14 are completed.

In general, since the time for reaching the test pressure to the heat exchanger 10 depends on the design specification of the heat exchanger, the present invention requires that the control unit 102 is provided with a fixed value Can not be set. Therefore, the time to reach the test pressure, that is, the allowable pressurization time TA, is measured in advance in the preliminary test stage before the full-scale pressure fatigue test, and then the pressurization step S330 and the pressure inspection step S360 are performed based on the measured time. . That is, the determination of a serious leak is detected when the allowable pressurization time (TA) set before the test becomes equal to the elapsed time (TP) after the start of pressurization.

Also, if minute leakage occurs during the pressure inspection step (S360), the pressure is slowly lowered. Therefore, if the pressure drop exceeds the set allowable pressure drop AP, the supply of the fluid to the first and second flow paths 12 and 14, the pressure and the pressure check are stopped. The pressure drop amount AP is a pressure value measured immediately after reaching the set (target) pressure SP1, that is, a pressure value (PT1) measured instantaneously, for example, Or PT2). If the pressure drop exceeds the set allowable pressure drop (AP), it is determined that there is a minute leak and the pressure fatigue test is terminated.

FIG. 8 is a flowchart showing the processing procedure of the steam supply step (S400) according to the temperature fatigue inspection shown in FIG. 4, and FIG. 9 is a flowchart showing the processing procedure of the low temperature fluid circulation step (S420) And Fig. 10 is a flowchart showing the processing procedure of the fluid removal step (S440) shown in Fig. These procedures are also processed by the fatigue test control algorithm 104 of the fatigue testing apparatus 100. [ In this embodiment, the steam supply step S400 and the low temperature fluid circulation step S420 supply steam to the first flow path 12 and supply and circulate the low temperature fluid to the second flow path 14, The test procedure is described in detail. It goes without saying that steam may be supplied to the second flow path 14 and the temperature fatigue test may be performed by supplying and circulating the low temperature fluid to the first flow path 12.

Referring to FIG. 8, the steam supply step (S400) of this embodiment is a procedure for raising the temperature of the heat exchanger (10), in which high temperature fluid is supplied to the first or second flow path (12 or 14) The heat exchanger 10 is raised to the set target temperature ST. In this embodiment, the hot fluid generally uses hot steam that is the most manageable and harmless to the human body.

That is, in step S402, the control unit 102 activates the steam boiler 122 to generate steam. At this time, the steam boiler 122 receives steam from the outside to generate steam. In step S404, when the temperature of the steam generated in the steam boiler 122 reaches the preset steam temperature ST, the control unit 102 outputs the control signal V4 to open the third automatic shutoff valve 150, And the steam is supplied to the first flow path 12 of the machine 10. At this time, the steam is continuously supplied to the heat exchanger 10 until the steam set pressure SP2 is reached. The steam supplied to the heat exchanger 10 is condensed by piping and an actuator to become condensed water. At this time, the control unit 102 opens the fourth automatic shut-off valve 152, causes the steam in the steam trap 126 to stay in the first flow path 12 of the heat exchanger 10, and removes only the condensed water from the condensate tank 124 To be returned to and circulated back to the steam boiler 122, thereby maximizing the thermal efficiency of the steam boiler 122.

The steam pressure PT1 of the first flow path 12 is measured by controlling the first pressure transmitter 142 in step S406.

It is determined whether the steam pressure PT1 measured in step S408 is equal to the steam setting pressure SP2. If the measured steam pressure PT1 is equal to the steam setting pressure SP2, then in step S410, the driving of the steam boiler 122 is stopped, and the third and the automatic shutoff valves 150 and 152 are closed, The supply of steam to the flow path 12 is stopped.

Since the steam setting pressure SP2 is a pressure thermodynamically corresponding to the set steam temperature ST, the measured steam pressure PT1 of the first flow path 12 measured reaches the target value pressure, that is, the steam setting pressure SP2 Means that the heat exchanger 10 is warmed by the set steam temperature ST. This is because the pressure of the steam is thermodynamically determined by the temperature. Therefore, the steam supply step S400 continues until the steam pressure PT1 of the measured first flow path 12 becomes equal to the steam setting pressure SP2.

Referring to FIG. 9, the low temperature fluid circulation step S420 is a procedure for dropping the temperature of the heat exchanger 10 again when the steam supply step S400 is completed. In step S422, 12 to the second flow path 14, that is, the low-temperature fluid. This is because the temperature of the heat exchanger 10 is raised to the set steam temperature ST through the steam supply step S400 so that the temperature of the heat exchanger 10 To drop it. The control unit 102 controls the flow of the fluid sufficiently cooled to a desired temperature through the chiller 114 to the second flow path 14 opposite to the first flow path 12 to which steam is supplied, Supply. To this end, the automatic regulating valve 138 is controlled to face the second flow path 14, the second automatic shut-off valve 158 is opened, and the supply pump 132 is operated to circulate the low temperature fluid.

In step S426, the temperature of the low-temperature fluid supplied to the second flow path 14 is measured. That is, the inlet-side temperature TC1 and the outlet-side temperature TC4 of the second flow path 14 are measured through the first and fourth temperature sensors 136 and 162, respectively.

It is determined in step S428 whether the inlet side temperature TC1 and the outlet side temperature TC4 of the second flow path 14 are the same.

If the inlet temperature TC1 and the outlet temperature TC4 of the second flow path 14 are equal to each other, the second automatic shutoff valve 158 is closed at step S430, the supply pump 132 is stopped The circulation of the low-temperature fluid of the second flow path 14 is stopped. If the inlet side temperature TC1 and the outlet side temperature TC4 of the second flow path 14 are not equal to each other, the procedure goes to step S422 to set the inlet side temperature TC1 of the second flow path 14 to the outlet side Steps S422 to S426 are repeated until the temperature TC4 is equal.

At this time, the temperature of the low-temperature fluid rises while passing through the heat exchanger 10 heated by the steam. Therefore, the low-temperature fluid is continuously circulated until the inlet-side temperature TC1 of the second flow path 14 becomes equal to the outlet-side temperature TC4, and the heat exchanger 10 whose temperature is raised by the steam is returned to the original temperature Cool sufficiently.

Referring to FIG. 10, the fluid removing step S440 is a preliminary procedure for raising the temperature of the heat exchanger 10 up to a desired value through the low temperature fluid circulating step S420 The fluid in the heat exchanger 10 is completely removed. This is because, when steam and low-temperature fluid remain in the heat exchanger 10, it takes a lot of energy and time to raise the temperature of the heat exchanger 10 again. Therefore, before the steam supply step S400, 10) It is necessary to remove both steam and low temperature fluid inside.

To this end, the fluid removal step S440 stops the operation of the supply pump 132 in step S442, and opens the fifth and sixth automatic shutoff valves 154 and 166 in step S444 to open the first and second flow paths 12 , 14 are opened.

The scavenge pump 172 is operated in step S446 and the fluid in the first and second flow paths 12 and 14 is recovered to the fluid tank 112 in step S448 so that all the fluids in the heat exchanger 10 .

In step S450, it is determined whether all of the fluid in the heat exchanger 10 is removed. At this time, the determination as to whether or not all of the fluid in the heat exchanger 10 has been sufficiently removed proceeds until the second flow switch 174 no longer senses the flow of fluid in the fourth fluid recovery line 212 .

As a result of the determination, if all the fluid is removed, the procedure goes to step S452 to stop the discharge pump 172.

4, the steam supply step S400, the low temperature fluid circulation step S420 and the fluid removal step S440 are performed to set the temperature of the set sub- And the number of cycles is counted by the control unit 102. The number of cycles is counted by the number of cycles SC.

In addition, the fatigue testing apparatus 100 of the present invention sequentially repeats the fluid supply step (S470) to the pressure inspecting step (S480) for the set total cycle number (TC), and then the heat exchanger And detects whether or not an abnormality has occurred. The fluid supply step S470 to the pressure inspection step S480 are performed in the same manner as the fluid supply step, the pressurization step, and the pressure inspection step S310 to S360 shown in FIGS. 5 to 7, The detailed description of the inspection steps (S470 to S480) is omitted.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, And changes are possible.

10: Heat exchanger
12, 14: Euro
100: Fatigue test apparatus
102:
104: Fatigue test control algorithm
106: Input
108: Warning part
110: fluid supply unit
120: Steam supply
130:

Claims (12)

1. A fatigue testing apparatus for a heat exchanger having a plurality of flow paths separated from each other, the apparatus comprising:
A fluid supply unit for supplying a fluid from the fluid supply source storing the fluid to the flow paths or supplying a low temperature fluid cooled to a predetermined temperature to the flow paths;
A steam supply unit for generating steam at a high temperature to supply steam to the flow paths;
A supply regulator for regulating the supply of the fluid or the low temperature fluid from the fluid supply unit or the supply of steam from the steam supply unit to selectively supply, pressurize, circulate and discharge the fluid or the steam to any one of the flow channels;
Supplying and pressurizing fluid from the fluid supply unit to the flow paths to supply pressure or temperature fatigue of the heat exchanger or supplying steam from one of the flow paths to one of the flow paths, The steam is supplied to the heat exchanger, the steam is supplied to the heat exchanger, the steam is supplied to the heat exchanger, and the steam is supplied to the heat exchanger, And a controller for controlling the fluid regulator to detect the state of the fluid,
Wherein the heat exchanger has the flow paths as first and second flow paths;
The supply regulator includes:
A supply pump driven to supply and pressurize fluid or low temperature fluid from the fluid source to the first and second flow paths;
A pressure regulator for keeping the pressure of the fluid supplied from the supply pump or the fluid at a low temperature constant;
An automatic regulating valve for regulating the fluid supply path so as to supply fluid or low-temperature fluid supplied from the pressure regulator to the first or second flow path;
A first temperature sensor for measuring the temperature of the inlet side of the second flow path;
A second temperature sensor for measuring the temperature of the inlet side of the first flow path;
A third temperature sensor for measuring the temperature of the outlet side of the first flow path;
A fourth temperature sensor for measuring the temperature of the outlet side of the second flow path;
A first pressure transmitter provided at one end of the first flow path and measuring a pressure value of the first flow path in real time;
A second pressure transmitter disposed at one end of the second flow path and measuring a pressure value of the second flow path in real time;
A first automatic shut-off valve provided at the other end of the first flow path to open or close the fluid to supply or block the fluid or the low temperature fluid to the first flow path;
A second automatic shut-off valve provided at the other end of the second flow path to open or close the fluid to supply or block the fluid or the low temperature fluid to the second flow path;
And a controller coupled to the first and second automatic shut-off valves to sense the fluid flow in the first or second flow path to determine a fluid supply completion time and pressure release of the first and second flow paths, 1 < / RTI > flow switch. delete The method according to claim 1,
The supply regulator includes:
A third automatic shutoff valve for supplying or blocking steam supplied from the steam supply unit to the first or second flow path;
Further comprising a fourth automatic shut-off valve for recovering or shutting off the steam discharged from the first or second flow path to the steam supply unit. The method of claim 3,
The supply regulator includes:
A fifth automatic shutoff valve for discharging or shutting off a fluid or a low temperature fluid accommodated in the first flow path;
A sixth automatic shutoff valve for discharging or shutting off the fluid contained in the second flow path;
A discharge pump driven to discharge a fluid or a low-temperature fluid from the first and second flow paths;
Further comprising a second flow switch for detecting the flow rate of the fluid discharged from the discharge pump or the flow rate of the low temperature fluid to determine the pressure release completion time and the completion time of the fluid supply. 5. The method of claim 4,
The supply regulator includes:
A first check valve for preventing back flow of fluid or low-temperature fluid supplied from the automatic regulating valve to the first flow path;
A second check valve for preventing back flow of fluid or low-temperature fluid supplied from the automatic regulating valve to the second flow path;
A first relief valve for discharging a fluid or a low temperature fluid so that the fluid pressure of the first flow path is adjusted when the fluid or the low temperature fluid is supplied to the first flow path at a pressure higher than the design pressure;
Further comprising a second relief valve for discharging a fluid or a low temperature fluid so that the fluid pressure of the second flow path is controlled when the fluid or the low temperature fluid is supplied to the second flow path at a design pressure or more, Fatigue testing equipment. 6. The method according to any one of claims 1 to 5,
Wherein the control unit is provided as a programmable logic controller;
Wherein the programmable logic controller monitors the pressure values of the flow paths measured from the supply regulator to selectively supply fluid, low temperature fluid or steam to the flow paths at least once to detect leakage of the flow paths, And a fatigue test control algorithm for controlling a fatigue life of the heat exchanger. delete delete delete delete delete delete

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