A graphite heat exchanger with leakage and heat exchange effect monitoring and a monitoring method thereof.

Abstract

The present invention discloses a graphite heat exchanger with leakage and heat exchange effect monitoring, comprising a heat exchanger body, an inlet pipe and an outlet pipe are arranged on the heat exchanger body; the inlet pipe is provided with a first solenoid valve, a pressure-maintaining pipeline, a pressure tank, a second solenoid valve, an inlet pH sensor, and an inlet temperature sensor; the outlet pipe is provided with an outlet pH sensor, an outlet temperature sensor, and a third solenoid valve. The present invention also discloses a monitoring method for a graphite heat exchanger with leakage and heat exchange effect monitoring. Through the monitoring method of the present invention, scaling and leakage can be monitored online during the operation of the heat exchanger, thereby avoiding the hidden dangers of production safety in the event of leakage. At the same time, since real-time monitoring is achieved, the problem of affecting production efficiency caused by regular shutdown inspections is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of graphite heat exchangers, and in particular relates to a graphite heat exchanger with leakage and heat exchange effect monitoring functions and a monitoring method. Background Art

[0002] Graphite heat exchangers are heat exchange equipment made of impermeable graphite as the base material. Due to its excellent corrosion resistance, they are mainly used for heat exchange of corrosive media such as hydrochloric acid, sulfuric acid, acetic acid and phosphoric acid, and are widely used in mining, chemical, pharmaceutical and new materials production industries. However, graphite has the characteristics of easy brittle cracking, low bending and tensile strength. Graphite heat exchangers working at a certain pressure and temperature often leak corrosive media due to holes or cracks in graphite blocks, graphite tubes or joints, causing graphite heat exchanger failures, resulting in parking, suspension of production, and even production safety accidents. In addition, in the actual production process, graphite heat exchangers that have been used for a long time will scale, and scaling will affect its heat exchange effect. At present, the detection of graphite heat exchanger leakage and heat exchange effect mainly relies on the daily experience of operators, or is determined by regular production suspension inspections. There are unsafe production risks in the case of leakage, and regular production suspension inspections will affect production efficiency.

[0003] Based on the above problems, the present application provides a graphite heat exchanger with leakage and heat exchange effect monitoring and a monitoring method. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art and to provide a graphite heat exchanger with leakage and heat exchange effect monitoring and a monitoring method.

[0005] To achieve the above object, the present invention adopts the following technical solution:

[0006] A graphite heat exchanger with leakage and heat exchange effect monitoring, comprising a heat exchanger body, wherein the heat exchanger body is provided with an inlet pipe and an outlet pipe for the flow of a coolant;

[0007] A first solenoid valve is arranged on the inlet pipe, a pressure-maintaining pipe is connected to the inlet pipe at the rear end of the first solenoid valve, and the other end of the pressure-maintaining pipe is connected to the pressure tank; a second solenoid valve is arranged on the pressure-maintaining pipe;

[0008] The inlet pipe at the rear end of the pressure-maintaining pipeline is provided with an inlet pH sensor for monitoring the pH value of the medium in the inlet pipe and an inlet temperature sensor for monitoring the temperature of the medium in the inlet pipe;

[0009] The outlet pipe is provided with an outlet pH sensor for monitoring the pH value of the medium in the outlet pipe and an outlet temperature sensor for monitoring the temperature of the medium in the outlet pipe;

[0010] A third solenoid valve is arranged on the outlet pipe.

[0011] Preferably, the first solenoid valve, the second solenoid valve, the third solenoid valve, the inlet pH sensor, the inlet temperature sensor, the outlet pH sensor, and the outlet temperature sensor are all connected to the controller;

[0012] The controller controls the opening and closing of the first solenoid valve, the second solenoid valve, and the third solenoid valve;

[0013] The controller receives detection data information of an inlet pH sensor, an inlet temperature sensor, an outlet pH sensor, and an outlet temperature sensor.

[0014] Preferably, the controller is connected to an alarm.

[0015] Preferably, the controller is in communication connection with a control terminal, and the control terminal is arranged in a monitoring computer and a handheld terminal;

[0016] The controller transmits the received detection data information and the leakage and scaling status of the heat exchanger to the control terminal in real time, and displays them on the monitoring screen of the monitoring computer and the handheld terminal;

[0017] The control terminal can send opening and closing instructions of the first solenoid valve, the second solenoid valve, and the third solenoid valve to the controller.

[0018] Preferably, the controller is communicatively connected with the control terminal via a 4G communication module, a 5G communication module, or a WiFi communication module.

[0019] The present invention also discloses a monitoring method for a graphite heat exchanger with leakage and heat exchange effect monitoring.

[0020] A method for monitoring a graphite heat exchanger with leakage and heat exchange effect monitoring comprises the following steps:

[0021] Step 1: The operator decides whether to conduct an active leak inspection;

[0022] When performing an active leak check, proceed to step 6;

[0023] Otherwise go to step 2:

[0024] Step 2: The controller receives the latest pH value of the inlet medium detected by the inlet pH sensor 入 , the inlet medium temperature T detected by the inlet temperature sensor 入 , the outlet pH value of the outlet medium detected by the outlet pH sensor 出 , outlet medium temperature T detected by outlet temperature sensor 出 ;

[0025] The controller calculates the temperature difference ΔT at this moment, ΔT = |T 入 -T 出 |;

[0026] The controller compares the temperature difference ΔT with the set temperature difference range [ΔT0, ΔT1];

[0027] The controller's outlet medium pH value at this moment 出 Compare with the set pH range [PH0, PH1];

[0028] When ΔT∈[ΔT0, ΔT1] and PH 出 ∈[PH0, PH1], the controller determines that the heat exchanger has neither leakage nor scaling, and then enters step 1;

[0029] when And PH 出 ∈[PH0, PH1], the controller determines that the heat exchanger is fouled, the alarm alarm sounds, and then enters step 3;

[0030] when and When the controller determines that the heat exchanger is leaking and scaling occurs at the same time, the alarm alarm sounds, and then the process goes to step 4;

[0031] When ΔT∈[ΔT0, ΔT1] and When the controller determines that the heat exchanger is leaking, the alarm goes off, and then the process goes to step 5;

[0032] Step 3: The operator sends a command to close the first solenoid valve and the third solenoid valve to the controller through the control terminal, and the controller controls the first solenoid valve and the third solenoid valve to close;

[0033] The maintenance personnel then perform scaling maintenance on the heat exchanger, and proceed to step 1 after the scaling maintenance is completed;

[0034] Step 4: The operator sends a command to close the first solenoid valve and the third solenoid valve to the controller through the control terminal, and the controller controls the first solenoid valve and the third solenoid valve to close;

[0035] The maintenance personnel then conducts scaling and leakage inspections on the heat exchanger. After the scaling and leakage inspections are completed, proceed to step 1;

[0036] Step 5: The operator decides whether to actively perform leakage pressure maintenance detection;

[0037] When actively performing leakage and pressure maintenance detection, proceed to step 6;

[0038] Otherwise, passive monitoring is performed and the process goes to step 9;

[0039] Step 6: The operator sends an instruction to the controller through the control terminal to close the first solenoid valve, close the third solenoid valve, and open the second solenoid valve. The controller controls the first solenoid valve to close, the third solenoid valve to close, and the second solenoid valve to open, thereby connecting the pressure tank for pressure holding test;

[0040] If the pressure maintenance is abnormal, confirm the leakage and go to step 7;

[0041] If the pressure is normal, go to step 8;

[0042] Step 7: The operator sends a command to close the second solenoid valve to the controller through the control terminal, and the controller controls the second solenoid valve to close;

[0043] The maintenance personnel then perform a leak inspection on the heat exchanger, and proceed to step 1 after the leak inspection is completed;

[0044] Step 8: The operator sends a work instruction to the controller through the control terminal, and the controller controls the first solenoid valve to open, the second solenoid valve to close, and the third solenoid valve to open, and then enters step 1;

[0045] Step 9: When the heat exchanger is judged to be leaking twice in succession, a leak pressure maintenance test is performed and the process goes to step 6;

[0046] Otherwise, go to step 2.

[0047] The beneficial effects of the present invention are:

[0048] (1) The monitoring method of the present invention can realize online monitoring of scaling and leakage during the operation of the heat exchanger, thereby avoiding the hidden dangers of production unsafe in the event of leakage. At the same time, since real-time monitoring is realized, the problem of affecting production efficiency caused by regular shutdown inspection is avoided;

[0049] (2) In the present invention, the controller compares the temperature difference ΔT with the set temperature difference range [ΔT0, ΔT1] and adjusts the pH value of the outlet medium. 出 By comparing with the set pH value range [PH0, PH1], passive monitoring of scaling and leakage is achieved; at the same time, the method of the present invention also realizes the selection of whether to actively check the heat exchanger for leakage, so the method of the present invention realizes active monitoring and passive monitoring of heat exchanger leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The drawings in the specification, which constitute a part of the present application, are used to provide further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0051] Figure 1 It is a structural schematic diagram of a graphite heat exchanger with leakage and heat exchange effect monitoring capabilities of the present invention;

[0052] Figure 2 It is a flow chart of a method for monitoring a graphite heat exchanger with leakage and heat exchange effect monitoring according to the present invention;

[0053] in:

[0054] 1-heat exchanger body, 2-inlet pipe, 3-outlet pipe, 4-first solenoid valve, 5-inlet pH sensor, 6-inlet temperature sensor, 7-pressure maintaining pipeline, 8-pressure tank, 9-second solenoid valve, 10-outlet pH sensor, 11-outlet temperature sensor, 12-third solenoid valve, 13-controller, 14-alarm, 15-control terminal, 16-monitoring computer, 17-handheld terminal. DETAILED DESCRIPTION

[0055] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0056] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0057] In the present invention, the directions or positional relationships indicated by terms such as "upper", "lower", "bottom", "top", etc. are based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present invention. They do not specifically refer to any part or element in the present invention and cannot be understood as limitations on the present invention.

[0058] In the present invention, terms such as "connected" and "connection" should be understood in a broad sense, indicating that the connection can be fixed, integral or detachable; it can be directly connected or indirectly connected through an intermediate medium. Relevant scientific research or technical personnel in this field can determine the specific meaning of the above terms in the present invention according to specific circumstances, and they should not be understood as limiting the present invention.

[0059] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0060] Embodiment 1:

[0061] like Figure 1As shown, a graphite heat exchanger with leakage and heat exchange effect monitoring includes a heat exchanger body 1, and the heat exchanger body 1 is provided with an inlet pipe 2 and an outlet pipe 3 for the flow of coolant;

[0062] The inlet pipe 2 is provided with a first solenoid valve 4, and a pressure-maintaining pipe 7 is connected to the inlet pipe 2 at the rear end of the first solenoid valve 4, and the other end of the pressure-maintaining pipe 7 is connected to a pressure tank 8; the pressure-maintaining pipe 7 is provided with a second solenoid valve 9;

[0063] The inlet pipe 2 at the rear end of the pressure-maintaining pipe 7 is provided with an inlet pH sensor 5 for monitoring the pH value of the medium in the inlet pipe 2 and an inlet temperature sensor 6 for monitoring the temperature of the medium in the inlet pipe 2;

[0064] The outlet pipe 3 is provided with an outlet pH sensor 10 for monitoring the pH value of the medium in the outlet pipe 3 and an outlet temperature sensor 11 for monitoring the temperature of the medium in the outlet pipe 3;

[0065] The outlet pipe 3 is provided with a third solenoid valve 12 .

[0066] Preferably, the first solenoid valve 4, the second solenoid valve 9, the third solenoid valve 12, the inlet pH sensor 5, the inlet temperature sensor 6, the outlet pH sensor 10, and the outlet temperature sensor 11 are all connected to the controller 13;

[0067] The controller 13 controls the opening and closing of the first solenoid valve 4 , the second solenoid valve 9 , and the third solenoid valve 12 .

[0068] In the present application, the controller 13 receives the detection data information of the inlet pH sensor 5, the inlet temperature sensor 6, the outlet pH sensor 10, and the outlet temperature sensor 11 and performs data analysis to determine whether the heat exchanger is leaking, whether scaling occurs, and whether to perform a leak review through a leak pressure maintenance test when a leak occurs in the heat exchanger.

[0069] Preferably, the controller 13 is connected to an alarm 14 .

[0070] Preferably, the controller 13 is in communication connection with a control terminal 15, and the control terminal 15 is arranged in a monitoring computer 16 and a handheld terminal 17;

[0071] The controller 13 transmits the received detection data information and the leakage and scaling status of the heat exchanger to the control terminal 15 in real time, and displays them on the monitoring screen of the monitoring computer 16 and the handheld terminal 17;

[0072] The control terminal 15 can send opening and closing instructions of the first solenoid valve 4 , the second solenoid valve 9 , and the third solenoid valve 12 to the controller 13 .

[0073] Preferably, the controller 13 and the control terminal 15 are communicatively connected via a 4G communication module, a 5G communication module, or a WiFi communication module.

[0074] Embodiment 2:

[0075] The monitoring method of the graphite heat exchanger with leakage and heat exchange effect monitoring in Example 1 is as follows: Figure 2 As shown, the following steps are included:

[0076] Step 1: The operator decides whether to conduct an active leak inspection;

[0077] When performing an active leak check, proceed to step 6;

[0078] Otherwise go to step 2:

[0079] Step 2: The controller 13 receives the latest pH value of the inlet medium detected by the inlet pH sensor 5. 入 , the inlet medium temperature T detected by the inlet temperature sensor 6 入 , the outlet medium pH value PH detected by the outlet pH sensor 10 出 , outlet medium temperature T detected by outlet temperature sensor 11 出 ;

[0080] The controller 13 calculates the temperature difference ΔT at this moment, ΔT=|T 入 -T 出 |;

[0081] The controller 13 compares the temperature difference ΔT with the set temperature difference range [ΔT0, ΔT1];

[0082] The controller 13 controls the pH value of the outlet medium at this moment. 出 Compare with the set pH range [PH0, PH1];

[0083] When ΔT∈[ΔT0, ΔT1] and PH 出 ∈[PH0, PH1], the controller 13 determines that the heat exchanger has neither leakage nor scaling, and then enters step 1;

[0084] when And PH 出 ∈[PH0, PH1], it indicates that the heat exchange efficiency of the heat exchanger is low, the controller 13 determines that the heat exchanger is fouled, the alarm 14 alarms, and then enters step 3;

[0085] when and When the controller 13 determines that the heat exchanger is leaking and scaling occurs simultaneously, the alarm 14 gives an alarm, and then the process goes to step 4;

[0086] When ΔT∈[ΔT0, ΔT1] and When the controller 13 determines that the heat exchanger is leaking, the alarm 14 gives an alarm, and then the process goes to step 5;

[0087] Step 3: The operator sends an instruction to close the first solenoid valve 4 and the third solenoid valve 12 to the controller 13 through the control terminal 15, and the controller 13 controls the first solenoid valve 4 and the third solenoid valve 12 to close;

[0088] The maintenance personnel then perform scaling maintenance on the heat exchanger, and proceed to step 1 after the scaling maintenance is completed;

[0089] Step 4: The operator sends a command to the controller 13 through the control terminal 15 to close the first solenoid valve 4 and the third solenoid valve 12, and the controller 13 controls the first solenoid valve 4 and the third solenoid valve 12 to close;

[0090] The maintenance personnel then conducts scaling and leakage inspections on the heat exchanger. After the scaling and leakage inspections are completed, proceed to step 1;

[0091] Step 5: The operator decides whether to actively perform leakage pressure maintenance detection;

[0092] When actively performing leakage and pressure maintenance detection, proceed to step 6;

[0093] Otherwise, passive monitoring is performed and the process goes to step 9;

[0094] Step 6: The operator sends an instruction to the controller 13 through the control terminal 15 to close the first solenoid valve 4, close the third solenoid valve 12, and open the second solenoid valve 9. The controller 13 controls the first solenoid valve 4 to close, the third solenoid valve 12 to close, and the second solenoid valve 9 to open, thereby connecting the pressure tank 8 to perform a pressure holding test;

[0095] If the pressure maintenance is abnormal, confirm the leakage and go to step 7;

[0096] If the pressure is normal, go to step 8;

[0097] Step 7: The operator sends a command to close the second solenoid valve 9 to the controller 13 through the control terminal 15, and the controller 13 controls the second solenoid valve 9 to close;

[0098] The maintenance personnel then perform a leak inspection on the heat exchanger, and proceed to step 1 after the leak inspection is completed;

[0099] Step 8: The operator sends a work instruction to the controller 13 through the control terminal 15, and the controller 13 controls the first solenoid valve 4 to open, the second solenoid valve 9 to close, and the third solenoid valve 12 to open, and then enters step 1;

[0100] Step 9: When the heat exchanger is judged to be leaking twice in succession, a leak pressure maintenance test is performed and the process goes to step 6;

[0101] Otherwise, go to step 2.

[0102] This application measures the temperature difference ΔT between the inlet and outlet of the coolant in the heat exchanger and compares it with the set temperature difference range [ΔT0, ΔT1], and uses this as the criterion for judging the heat exchange effect, and then determines whether scaling occurs; by measuring the pH value of the medium at the outlet of the heat exchanger 出 Compare with the set pH value range [PH0, PH1] and use this as the criterion for judging whether leakage occurs.

[0103] In this application, the method for determining the set temperature difference range [ΔT0, ΔT1] and the set pH value range [PH0, PH1] is:

[0104] To ensure the normal operation of the heat exchanger, collect samples at no less than 3,000 times, each sample including the inlet medium pH value, inlet medium temperature, outlet medium pH value, and outlet medium temperature at the corresponding time;

[0105] Difference is made between the inlet medium temperature and the outlet medium temperature in each sample, and the absolute value is taken. The minimum value of the absolute value of the temperature difference in all samples is taken as ΔT0, and the maximum value is taken as ΔT1, so as to obtain the set temperature difference range [ΔT0, ΔT1];

[0106] The minimum value of the outlet medium pH value in all samples is taken as PH0, and the maximum value is taken as PH1, so as to obtain the set temperature difference range and the set pH value range [PH0, PH1].

[0107] Through the monitoring method of the present invention, scaling and leakage can be monitored online during the operation of the heat exchanger, thereby avoiding unsafe production hazards in the event of leakage. At the same time, since real-time monitoring is achieved, the problem of affecting production efficiency caused by regular shutdown inspections is avoided.

[0108] In the present invention, the controller 13 compares the temperature difference ΔT with the set temperature difference range [ΔT0, ΔT1] and adjusts the pH value of the outlet medium. 出 By comparing with the set pH value range [PH0, PH1], passive monitoring of scaling and leakage is achieved; at the same time, the method of the present invention realizes the selection of whether to actively check the heat exchanger for leakage, so the method of the present invention realizes active monitoring and passive monitoring of heat exchanger leakage.

[0109] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not a limitation of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the protection scope of the present invention.

Claims

1. A monitoring method for a graphite heat exchanger with leakage and heat exchange effect monitoring, wherein the graphite heat exchanger with leakage and heat exchange effect monitoring comprises a heat exchanger body, wherein the heat exchanger body is provided with an inlet pipe and an outlet pipe for the flow of a coolant; characterized in that: A first solenoid valve is arranged on the inlet pipe, a pressure-maintaining pipe is connected to the inlet pipe at the rear end of the first solenoid valve, and the other end of the pressure-maintaining pipe is connected to the pressure tank; a second solenoid valve is arranged on the pressure-maintaining pipe; The inlet pipe at the rear end of the pressure-maintaining pipeline is provided with an inlet pH sensor for monitoring the pH value of the medium in the inlet pipe and an inlet temperature sensor for monitoring the temperature of the medium in the inlet pipe; The outlet pipe is provided with an outlet pH sensor for monitoring the pH value of the medium in the outlet pipe and an outlet temperature sensor for monitoring the temperature of the medium in the outlet pipe; A third solenoid valve is arranged on the outlet pipe; The first solenoid valve, the second solenoid valve, the third solenoid valve, the inlet pH sensor, the inlet temperature sensor, the outlet pH sensor, and the outlet temperature sensor are all connected to the controller; The controller controls the opening and closing of the first solenoid valve, the second solenoid valve, and the third solenoid valve; The controller receives detection data information of an inlet pH sensor, an inlet temperature sensor, an outlet pH sensor, and an outlet temperature sensor; The controller is connected to the alarm; The controller is in communication connection with a control terminal, and the control terminal is arranged in a monitoring computer and a handheld terminal; The controller transmits the received detection data information and the leakage and scaling status of the heat exchanger to the control terminal in real time, and displays them on the monitoring screen of the monitoring computer and the handheld terminal; The control terminal can send opening and closing instructions of the first solenoid valve, the second solenoid valve, and the third solenoid valve to the controller; The monitoring method comprises the following steps: Step 1: The operator decides whether to conduct an active leak inspection; When performing an active leak check, proceed to step 6; Otherwise go to step 2: Step 2: The controller receives the latest pH value of the inlet medium detected by the inlet pH sensor 入 , the inlet medium temperature T detected by the inlet temperature sensor 入 , the outlet pH value of the outlet medium detected by the outlet pH sensor 出 , outlet medium temperature T detected by outlet temperature sensor 出 ; The controller calculates the temperature difference ΔT at this moment, ΔT=| T 入 -T 出 |; The controller compares the temperature difference ΔT with the set temperature difference range [ΔT0, ΔT1]; The controller's outlet medium pH value at this moment 出 Compare with the set pH range [PH0, PH1]; When ΔT∈[ΔT0, ΔT1] and PH 出 ∈[PH0, PH1], the controller determines that the heat exchanger has neither leakage nor scaling, and then enters step 1; When ΔT∉[ΔT0, ΔT1] and PH 出 ∈[PH0, PH1], the controller determines that the heat exchanger is fouled, the alarm alarm sounds, and then enters step 3; When ΔT∉[ΔT0, ΔT1] and PH 出 ∉[PH0, PH1], the controller determines that the heat exchanger is leaking and scaling occurs simultaneously, the alarm goes off, and then goes to step 4; When ΔT∈[ΔT0, ΔT1] and PH 出 ∉[PH0, PH1], the controller determines that the heat exchanger is leaking, the alarm goes off, and then goes to step 5; Step 3: The operator sends a command to close the first solenoid valve and the third solenoid valve to the controller through the control terminal, and the controller controls the first solenoid valve and the third solenoid valve to close; The maintenance personnel then perform scaling maintenance on the heat exchanger, and proceed to step 1 after the scaling maintenance is completed; Step 4: The operator sends a command to close the first solenoid valve and the third solenoid valve to the controller through the control terminal, and the controller controls the first solenoid valve and the third solenoid valve to close; The maintenance personnel then conducts scaling and leakage inspections on the heat exchanger. After the scaling and leakage inspections are completed, proceed to step 1; Step 5: The operator decides whether to actively perform leakage pressure maintenance detection; When actively performing leakage and pressure maintenance detection, proceed to step 6; Otherwise, passive monitoring is performed and the process goes to step 9; Step 6: The operator sends an instruction to the controller through the control terminal to close the first solenoid valve, close the third solenoid valve, and open the second solenoid valve. The controller controls the first solenoid valve to close, the third solenoid valve to close, and the second solenoid valve to open, thereby connecting the pressure tank for pressure holding test; If the pressure maintenance is abnormal, confirm the leakage and go to step 7; If the pressure is normal, go to step 8; Step 7: The operator sends a command to close the second solenoid valve to the controller through the control terminal, and the controller controls the second solenoid valve to close; The maintenance personnel then perform a leak inspection on the heat exchanger, and proceed to step 1 after the leak inspection is completed; Step 8: The operator sends a work instruction to the controller through the control terminal, and the controller controls the first solenoid valve to open, the second solenoid valve to close, and the third solenoid valve to open, and then enters step 1; Step 9: When the heat exchanger is judged to be leaking twice in succession, a leak pressure maintenance test is performed and the process goes to step 6; Otherwise, go to step 2.

2. The method for monitoring a graphite heat exchanger with leakage and heat exchange effect monitoring according to claim 1, characterized in that: The controller is communicatively connected with the control terminal via a 4G communication module, a 5G communication module or a WiFi communication module.

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