Forced periodic discharge test system and method for pressure-bearing boiler safety valve

Abstract

The application discloses a kind of forced periodical discharge test system and method of pressure boiler safety valve, one or more safety valves are equipped on the drum of pressure boiler, and its system includes: pressure sensor for detecting the pressure in the drum, which is installed on the drum of pressure boiler;First sensor for detecting whether the safety valve is opened;Second sensor for detecting whether there is medium discharge at the discharge port of the safety valve;And control cabinet for sending corresponding discharge test instructions and completing interactive work according to the detection data of pressure sensor, each first sensor and each second sensor, which is connected with pressure sensor, each first sensor and each second sensor respectively.The application makes the boiler daily safety management work in place, personnel operation is more standardized, and reduces the boiler safety accident.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of boilers, and particularly relates to a forced periodic discharge test system and method for a pressure-bearing boiler safety valve. BACKGROUND

[0002] With the increasing maturity of boiler technology, the use scenarios of boilers in various industries are increasingly rich, and therefore there are a large number of boilers in both urban centers and industrial clusters. As special equipment, pressure-bearing boilers are required to be comprehensively designed, manufactured, installed, used and maintained to avoid safety accidents in the whole process, so as to ensure safe operation and protect personal and property safety, and promote the development of the national economy.

[0003] As the most basic safety component of a pressure-bearing boiler, a safety valve plays an important role in avoiding overpressure operation of the boiler. When the operating pressure of the boiler is out of control and exceeds the rated pressure of the boiler, the safety valve serves as the last line of defense to jump and release pressure to ensure the safe pressure of the boiler, and prevent the most serious overpressure explosion accidents of the boiler. Since the safety valve is a mechanical device, mechanical failures and valve clamping are important hidden dangers affecting the reliable jump of the safety valve. In order to timely find and eliminate the hidden dangers of the reliable operation of the safety valve and ensure the reliable operation of the safety valve, the special equipment safety technical specification clearly stipulates that the safety valve of the boiler in use should be checked at least once a year, and the safety valve of the boiler should be periodically discharged for test. According to the above regulations, the boiler using unit formulates a periodic safety discharge test system for the safety valve, and stipulates that the stoker personnel should fill in the discharge test operation log after each safety valve discharge test is completed. However, in the actual implementation process, since the safety valve is installed at a high position and the climbing intensity is large, and since this work needs to be performed periodically during the operation of the boiler as a stipulated periodic routine work, the stoker personnel may directly fill in false completion records of the discharge test in the operation log due to negligence or lack of responsibility, and since the authenticity of the operation log recording the periodic discharge test of the safety valve cannot be reviewed, and there is no technical measure to control the discharge test of the safety valve, the periodic discharge test of the safety valve is actually out of control and cannot be supervised, and then serious safety accidents such as overpressure explosion of the boiler due to failure or locking of the safety valve when the operating pressure of the boiler exceeds the rated pressure of the boiler still continue to occur.

[0004] Therefore, it is necessary to develop a forced periodic discharge test system and method for a pressure-bearing boiler safety valve. SUMMARY

[0005] The application aims to provide a forced periodic discharge test system and method for a pressure-bearing boiler safety valve, which can make the daily safety management work of the boiler practical, and the personnel operation more standardized, so as to reduce the safety accidents of the boiler.

[0006] In a first aspect, the application discloses a forced periodical discharge test system for a safety valve of a pressure boiler, wherein one or more safety valves are arranged on a drum of the pressure boiler, and the system comprises:

[0007] a pressure sensor for detecting the pressure in the drum, which is arranged on the drum of the pressure boiler;

[0008] a first sensor for detecting whether the safety valve is opened;

[0009] a second sensor for detecting whether the medium is discharged from the discharge port of the safety valve;

[0010] and a control cabinet for sending corresponding discharge test instructions and completing interactive work according to the detection data of the pressure sensor, the first sensors and the second sensors, which is connected with the pressure sensor, the first sensors and the second sensors respectively.

[0011] Optionally, the first sensor is a position sensor, which is arranged beside the operating handle of the safety valve.

[0012] The second sensor is a water vapor medium sensor, which is arranged at the discharge port of the safety valve, wherein the water vapor medium sensor includes but is not limited to a temperature sensor, a pressure sensor or a medium flow sensing sensor.

[0013] Optionally, the control cabinet comprises:

[0014] a pressure transmitter for reading the pressure value detected by the pressure sensor, which is connected with the pressure sensor;

[0015] a timing device for presetting the time interval T of manual test, the pressure value P of test permission, and starting the countdown after the setting is successful;

[0016] a data storage for recording data;

[0017] a first signal instruction generator for sending an alarm signal;

[0018] a second signal instruction generator for sending an alarm signal;

[0019] and the control unit is used for controlling the first signal command generator to send an alarm signal that the manual discharge test period of the safety valve has arrived after detecting that the countdown of the timing device ends; is used for continuously reading the pressure reading of the pressure transmitter and comparing with the pressure value P, if the pressure value changes from greater than the pressure value P to less than the pressure value P, then controlling the second signal command generator to send an alarm signal that the manual discharge test can be performed; and when each position sensor detects that the corresponding safety valve has been opened and each water vapor medium sensor identifies that the discharge port of the corresponding safety valve has medium discharge, controlling the first signal command generator and the second signal command generator to be closed, and controlling the data storage to record the discharge test completion time and the drum pressure during the discharge test; and after detecting that the second signal command generator is closed, resetting the preset manual test time interval T of the timing device to start the countdown of the next discharge test, the control unit is connected with the pressure transmitter, the timing device, the data storage, the first signal command generator, the second signal command generator, each position sensor, and each water vapor medium sensor.

[0020] Optionally, the control cabinet further comprises a third signal command generator connected with the control unit.

[0021] The control unit is further used for determining that the safety valve cannot normally discharge when detecting that the safety valve has been opened and the corresponding water vapor medium sensor does not identify that the discharge port of the safety valve has medium discharge, and controlling the third signal command generator to send an alarm signal that the safety valve cannot normally discharge, and controlling the data storage to record the current time and the drum pressure.

[0022] Optionally, the control unit is further used for controlling the third signal command generator to send an alarm signal that leakage or automatic take-off phenomenon occurs if the water vapor medium sensor identifies that there is medium discharge at any time during the countdown of the timing device has not ended, and controlling the data storage to record the current time and the drum pressure.

[0023] Optionally, the control cabinet further comprises an Internet of Things module h for realizing remote parameter setting, remote prompting to enter the manual test period, remote recording of the operation completion time and the pressure at the time, and remote safety valve abnormality alarm, and the Internet of Things module is connected with the control unit.

[0024] In the second aspect, the application discloses a forced periodic discharge test method of a pressure boiler safety valve, which adopts the forced periodic discharge test system of the pressure boiler safety valve.

[0025] Step 1. presetting a manual test time interval T and a pressure value P allowed to perform the test, and starting the countdown after successful setting.

[0026] Step 2. After the countdown ends, the control cabinet sends an alarm signal that the safety valve manual discharge test period has arrived;

[0027] Step 3. After the pressure of the pressure boiler is released, the control cabinet continuously reads the pressure value and compares it with the pressure value P. If the pressure value changes from greater than the pressure value P to less than the pressure value P, the control cabinet sends a warning signal that the manual discharge test can be performed;

[0028] Step 4. Perform safety valve manual discharge test. When it is detected that each safety valve has been opened and each safety valve discharge port has medium discharge, the system records the discharge test completion time and the drum pressure during the discharge test;

[0029] Step 5. Reset the preset manual test time interval T and start the countdown for the next discharge test.

[0030] In a third aspect, the forced periodic discharge test method of the safety valve of the pressure boiler comprises the following steps:

[0031] Step 1. The timing device is used to preset the manual test time interval T and the pressure value P allowed for the test. After the setting is successful, the timing device starts the countdown;

[0032] Step 2. After the countdown of the timing device ends, the first signal command generator on the control cabinet sends an alarm signal that the safety valve manual discharge test period has arrived;

[0033] Step 3. After the pressure of the pressure boiler is released, the control cabinet continuously reads the pressure value and compares it with the pressure value P. If the pressure value changes from greater than the pressure value P to less than the pressure value P, the second signal command generator on the control cabinet sends a warning signal that the manual discharge test can be performed;

[0034] Step 4. Perform safety valve manual discharge test. When it is detected that each safety valve has been opened and each safety valve discharge port has medium discharge, the system records the discharge test completion time and the drum pressure during the discharge test;

[0035] Step 5. After the second signal command generator is detected to be closed, the preset manual test time interval T of the timing device is reset, and the countdown for the next discharge test is started.

[0036] In a fourth aspect, the forced periodic discharge test method of the safety valve of the pressure boiler comprises the following steps:

[0037] Step 1. Set the time interval T of manual test, the pressure value P of allowing test by the timing device, and the timing device starts counting down after setting success;

[0038] Step 2. After the timing device counting down ends, the first signal command generator on the control cabinet sends the alarm signal that the period of safety valve manual discharge test has arrived;

[0039] Step 3. After the pressure of the pressure boiler is released, the control cabinet continuously reads the pressure reading and compares with the pressure value P, if the pressure value changes from greater than the pressure value P to less than the pressure value P, the second signal command generator on the control cabinet sends the warning signal that the manual discharge test can be performed;

[0040] Step 4. Perform safety valve manual discharge test, when each position sensor detects that the corresponding safety valve has been opened, and each water vapor medium sensor identifies that the medium is discharged, then the control unit controls the first signal command generator and the second signal command generator to close, and the data storage records the discharge test completion time and the drum pressure during the discharge test;

[0041] Step 5. After detecting that the second signal command generator is closed, reset the preset time interval T of manual test of the timing device, and start the countdown of the next discharge test again;

[0042] Wherein, when the control unit detects that the safety valve has been opened, and the corresponding water vapor medium sensor does not identify that the medium is discharged at the vent of the safety valve, it is determined that the safety valve cannot normally release pressure, and the third signal command generator sends the alarm signal that the safety valve cannot normally release pressure, and the data storage records the current time and the drum pressure.

[0043] Optionally, it also includes: at any time during the timing device counting down, if it is monitored that the water vapor medium sensor identifies that the medium is discharged, the third signal command generator sends the alarm signal that the leakage or automatic jump phenomenon occurs, and the data storage records the current time and the drum pressure.

[0044] The present application has the following advantages: the present application focuses on the safety problem of boiler operation, deeply focuses on the daily work operation process of safety valve periodic discharge test, reminds the stoker to perform safety valve periodic discharge test through technical means, leaves marks on the test process through sensors, and saves the test records to the host computer, and avoids using handwritten forms as the basis for completion. Both avoid the stoker forgetting the work, and enable the management personnel to review the discharge test records at any time, avoid false records of the stoker on the discharge test, make the safety valve periodic discharge test work always in a controlled and effective state, timely find the safety hazards existing in the safety valve, ensure the reliable operation of the safety valve, and greatly reduce the occurrence of serious accidents such as boiler overpressure explosion caused by the failure of the safety valve when the boiler operating pressure exceeds the rated pressure of the boiler. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 is a structural schematic diagram of the present application;

[0046] Figure 2 is a principle block diagram of the present application;

[0047] Figure 3 is a flow chart of the present application;

[0048] In the figure: 1 - pressure-bearing boiler, 2 - position sensor, 3 - safety valve, 4 - water vapor medium sensor, 5 - pressure sensor, 6 - control cabinet, 6a - control unit, 6b - pressure transmitter, 6c - timing device, 6d - first signal command generator, 6e - second signal command generator, 6f - third signal command generator, 6g - data storage, 6h - Internet of Things module. DETAILED DESCRIPTION

[0049] The present application will be described in detail below with reference to the accompanying drawings.

[0050] Example 1

[0051] As shown in Figure 1 , in this embodiment, a pressure-bearing boiler safety valve forced periodic discharge test system is provided on the drum of the pressure-bearing boiler 1. The system includes: a pressure sensor 5 for detecting the pressure in the drum, which is installed on the drum of the pressure-bearing boiler 1; a first sensor for detecting whether the safety valve 3 is opened; a second sensor for detecting whether there is medium discharge at the discharge port of the safety valve 3; and a control cabinet 6 for sending corresponding discharge test instructions and completing interactive work according to the detection data of the pressure sensor 5, each first sensor and each second sensor, which is connected with the pressure sensor 5, each first sensor and each second sensor.

[0052] In this embodiment, the first sensor is a position sensor 2, which is installed beside the operating handle of the safety valve 3. When the operating handle of the safety valve 3 contacts the position sensor 2, it indicates that the safety valve 3 has been opened. The second sensor is a water vapor medium sensor 4, which is installed at the discharge port of the safety valve 3. The water vapor medium sensor 4 includes, but is not limited to, a temperature sensor, a pressure sensor, or a medium flow sensing sensor.

[0053] In this embodiment, a forced periodic discharge test method for a pressure boiler safety valve is provided. The method includes the following steps:

[0054] Step 1. Set the time interval T of manual test, the allowable test pressure value P, and start the countdown after successful setting.

[0055] Step 2. After the countdown is over, the control cabinet 6 sends an alarm signal that the safety valve manual discharge test period has arrived, prompting the fireman that the safety valve manual discharge test period has arrived and preparing for the discharge test.

[0056] Step 3. After the fireman normally operates the pressure relief of the pressure boiler 1 according to the relevant regulations, the control cabinet 6 continuously reads the pressure reading and compares it with the pressure value P. If the pressure value changes from greater than the pressure value P to less than the pressure value P, the control cabinet 6 sends an alarm signal that the manual discharge test can be performed, prompting the fireman that the test conditions have been met and the manual discharge test can be performed.

[0057] Step 4. The fireman performs the safety valve manual discharge test. When it is detected that each safety valve 3 has been opened and each safety valve 3 has medium discharge at the discharge port, the system records the discharge test completion time and the drum pressure during the discharge test.

[0058] Step 5. Reset the preset time interval T of manual test and start the countdown for the next discharge test.

[0059] Embodiment Two

[0060] In this embodiment, as Figure 2As shown, a forced periodic discharge test system for a pressure boiler safety valve, wherein the control cabinet 6 comprises a pressure transmitter 6b, a timing device 6c, a data storage 6g, a first signal command generator 6d, a second signal command generator 6e and a control unit 6a. The pressure transmitter 6b is used to read the pressure value detected by the pressure sensor 5, and is connected with the pressure sensor 5. The timing device 6c is used to preset the time interval T of manual test, the pressure value P allowing the test, and starts the countdown after the setting is successful. The data storage 6g is used to record data. The first signal command generator 6d is used to send an alarm signal. The second signal command generator 6e is used to send an alarm signal. The control unit 6a is used to control the first signal command generator 6d to send an alarm signal that the safety valve manual discharge test period has arrived after detecting the end of the countdown of the timing device 6c; to continuously read the pressure reading of the pressure transmitter 6b and compare it with the pressure value P, and if the pressure value changes from greater than the pressure value P to less than the pressure value P, then control the second signal command generator 6e to send an alarm signal that the manual discharge test can be performed; and when each position sensor 2 detects that the corresponding safety valve 3 has been opened, and each water vapor medium sensor 4 identifies that the discharge port of the corresponding safety valve 3 has medium discharge, control the first signal command generator 6d and the second signal command generator 6e to close, and control the data storage 6g to record the discharge test completion time and the drum pressure during the discharge test; and after detecting that the second signal command generator 6e is closed, reset the preset time interval T of manual test of the timing device 6c, and start the countdown for the next discharge test, the control unit 6a is connected with the pressure transmitter 6b, the timing device 6c, the data storage 6g, the first signal command generator 6d, the second signal command generator 6e, each position sensor 2 and each water vapor medium sensor 4 respectively.

[0061] In this embodiment, a forced periodic discharge test method for a pressure boiler safety valve is adopted, which uses the forced periodic discharge test system for a pressure boiler safety valve as described in this embodiment, and the method comprises the following steps:

[0062] Step 1. The time interval T of manual test and the pressure value P allowing the test are preset by the timing device 6c, and the timing device 6c starts the countdown after the setting is successful.

[0063] Step 2. After the countdown of the timing device 6c ends, the first signal command generator 6d on the control cabinet 6 sends an alarm signal that the safety valve manual discharge test period has arrived, to prompt the fireman that the safety valve manual discharge test period has arrived, and to prepare for the discharge test.

[0064] Step 3. After the boiler operator normally operates the pressure relief of the pressure boiler 1 according to the relevant regulations, the control cabinet 6 continuously reads the pressure reading of the pressure transmitter 6b and compares it with the pressure value P. If the pressure value changes from greater than the pressure value P to less than the pressure value P, the second signal command generator 6e on the control cabinet 6 sends an alarm signal that can perform a manual discharge test to prompt the boiler operator that the test conditions are met and the manual discharge test can be performed.

[0065] Step 4. The boiler operator performs a safety valve manual discharge test. When each position sensor 2 detects that the corresponding safety valve 3 has been opened (when the operating handle of the rotating safety valve 3 moves to contact the position sensor 2 installed beside the safety valve 3, it indicates that the safety valve 3 has been opened), and each water vapor medium sensor 4 identifies that there is medium discharge, then the control unit 6a controls the first signal command generator 6d and the second signal command generator 6e to close, and the data storage 6g records the discharge test completion time and the drum pressure at the time of the discharge test.

[0066] Step 5. After detecting that the second signal command generator 6e is closed, reset the preset manual test time interval T of the timing device 6c, and start the countdown for the next discharge test.

[0067] The remaining parts are the same as in Example 1.

[0068] Example Three

[0069] In this embodiment, as shown in Figure 2 , a pressure boiler safety valve forced periodic discharge test system, the control cabinet 6 further comprises a third signal command generator 6f, which is connected with the control unit 6a. The control unit 6a is further used to detect that the safety valve 3 has been opened, and the corresponding water vapor medium sensor 4 has not identified that there is medium discharge at the vent of the safety valve 3, then it is determined that the safety valve 3 cannot normally relieve pressure, and controls the third signal command generator 6f to send an alarm signal that the safety valve 3 cannot normally relieve pressure, and controls the data storage 6g to record the current time and the drum pressure.

[0070] In this embodiment, the control unit 6a is further used to monitor the water vapor medium sensor 4 to identify that there is medium discharge at any time during the countdown of the timing device 6c, and controls the third signal command generator 6f to send an alarm signal that there is leakage or automatic take-off phenomenon occurs, and controls the data storage 6g to record the current time and the drum pressure.

[0071] In this embodiment, the control cabinet 6 further comprises an Internet of Things module 6h for realizing remote parameter setting, remote prompting to enter a manual test period, remote recording of operation completion time and pressure at the time, and remote safety valve abnormality alarm. The Internet of Things module 6h is connected with the control unit 6a.

[0072] In this embodiment, a forced periodic discharge test method of a pressure boiler safety valve is adopted, and the method comprises the following steps:

[0073] Step 1. The time interval T of manual test, the pressure value P allowed to test are preset by the timing device 6c, and after the setting is successful, the timing device 6c starts to count down.

[0074] Step 2. After the timing device 6c finishes counting down, the first signal command generator 6d on the control cabinet 6 sends an alarm signal that the safety valve manual discharge test period has arrived, prompting the fireman that the safety valve manual discharge test period has arrived and preparing for the discharge test.

[0075] Step 3. After the fireman normally operates the pressure relief of the pressure boiler 1 according to the relevant regulations, the control cabinet 6 continuously reads the pressure reading and compares it with the pressure value P. If the pressure value changes from greater than the pressure value P to less than the pressure value P, the second signal command generator 6e on the control cabinet 6 sends a warning signal that the manual discharge test can be performed, prompting the fireman that the test conditions are met and the manual discharge test can be performed.

[0076] Step 4. The fireman performs the safety valve manual discharge test. When each position sensor 2 detects that the corresponding safety valve 3 has been opened, and each water vapor medium sensor 4 recognizes that the medium is discharged, the control unit 6a controls the first signal command generator 6d and the second signal command generator 6e to be closed, and the data storage 6g records the discharge test completion time and the drum pressure at the time of discharge test.

[0077] Step 5. After detecting that the second signal command generator 6e is closed, reset the preset time interval T of manual test of the timing device 6c, and start to count down for the next discharge test.

[0078] When the control unit 6a detects that the safety valve 3 has been opened, and the corresponding water vapor medium sensor 4 (i.e. the water vapor medium sensor 4 installed at the pressure relief port of the safety valve 3) does not recognize that the medium is discharged at the pressure relief port of the safety valve 3, it is determined that the safety valve 3 cannot normally relieve pressure, and the third signal command generator 6f sends an alarm signal that the safety valve 3 cannot normally relieve pressure, prompting the fireman that the safety valve 3 has a safety problem and needs to be shut down for maintenance and replacement, and the data storage 6g records the current time and the drum pressure.

[0079] In the embodiment, the method further comprises: if the water vapor medium sensor 4 detects that the medium is discharged at any time during the countdown of the timing device 6c, the third signal command generator 6f sends an alarm signal indicating that the leakage or automatic jump phenomenon occurs, prompting the fireman to check the safety valve 3 for leakage or automatic jump phenomenon, and stopping the boiler for inspection, and the data storage device 6g records the current time and the drum pressure.

[0080] The method solves the supervision problem of the safety valve in the management and operation process of the boiler, realizes the specific work of the periodic manual discharge test of the safety valve, eliminates the omissions and frauds of the work, and provides a guarantee for the safe operation of the boiler.

[0081] The above embodiment is a preferred implementation manner of the method, but the implementation manner of the method is not limited by the above embodiment, and any change, modification, replacement, combination, simplification made without departing from the spirit and principle of the method should be an equivalent replacement manner, and all are included in the protection scope of the method.

Claims

1. A pressure boiler safety valve forced periodic discharge test system, wherein one or more safety valves (3) are provided on the drum of the pressure boiler (1), characterized in that, Its system includes: A pressure sensor (5) is used to detect the pressure inside the boiler drum. The pressure sensor (5) is installed on the boiler drum of the pressure boiler (1). The first sensor is used to detect whether the safety valve (3) is open; A second sensor is used to detect whether there is media discharge from the vent of the safety valve (3); And a control cabinet (6) for sending corresponding emission test commands and completing interactive work based on the detection data of the pressure sensor (5), each first sensor and each second sensor, the control cabinet (6) being connected to the pressure sensor (5), each first sensor and each second sensor respectively; The first sensor is a position sensor (2), which is installed next to the operating handle of the safety valve (3); The second sensor is a water vapor medium sensor (4), which is installed at the vent of the safety valve (3). The water vapor medium sensor (4) includes a temperature sensor, a pressure sensor, or a medium flow sensor. The control cabinet (6) includes: A pressure transmitter (6b) is used to read the pressure value detected by the pressure sensor (5), and the pressure transmitter (6b) is connected to the pressure sensor (5). The timing device (6c) is used to preset the time interval T of the manual test and the pressure value P that allows the test to be conducted, and starts the countdown after the setting is successful; Data storage (6g) for recording data; The first signal command generator (6d) is used to issue an alarm signal; The second signal command generator (6e) is used to issue an alarm signal; The control unit (6a) is used to control the first signal command generator (6d) to issue an alarm signal indicating that the manual discharge test cycle of the safety valve has ended after the countdown of the timing device (6c) is detected; to continuously read the pressure reading of the pressure transmitter (6b) and compare it with the pressure value P. If the pressure value changes from greater than the pressure value P to less than the pressure value P, the control unit (6e) is used to issue an alarm signal indicating that the manual discharge test can be performed; and when each position sensor (2) detects that the corresponding safety valve (3) has been opened, and each water vapor medium sensor (4) identifies that there is medium discharged from the vent of the corresponding safety valve (3), the control unit (6d) and the second signal command generator (6e) are closed. The control unit (6a) is connected to the pressure transmitter (6b), the timing device (6c), the data storage (6g) records the completion time of the emission test and the pressure of the boiler drum during the emission test; and after detecting that the second signal command generator (6e) is closed, the preset manual test time interval T of the timing device (6c) is reset and the countdown for the next emission test is restarted. The control unit (6a) is connected to the pressure transmitter (6b), the timing device (6c), the data storage (6g), the first signal command generator (6d), the second signal command generator (6e), each position sensor (2), and each water vapor medium sensor (4); the control cabinet (6) also includes a third signal command generator (6f), which is connected to the control unit (6a); The control unit (6a) is also used to determine that the safety valve (3) cannot release pressure normally when it is detected that the safety valve (3) has been opened and the corresponding water vapor medium sensor (4) has not detected that there is medium discharged at the vent of the safety valve (3), and to control the third signal command generator (6f) to issue an alarm signal that it cannot release pressure normally, and at the same time control the data storage (6g) to record the current time and boiler pressure.

2. The forced periodic discharge test system for pressure boiler safety valves according to claim 1, characterized in that: The control unit (6a) is also used to control the third signal command generator (6f) to issue an alarm signal indicating leakage or automatic start-up at any time during the countdown of the timing device (6c) before it ends, if the water vapor medium sensor (4) detects that there is medium discharge. At the same time, it controls the data storage device (6g) to record the current time and boiler pressure.

3. The pressure boiler safety valve forced periodic discharge test system according to claim 2, characterized in that: The control cabinet (6) also includes an Internet of Things (IoT) module (6h) for remotely setting parameters, remotely prompting the entry of manual experiment cycle, remotely recording the operation completion time and the pressure at that time, and remotely alarming the safety valve abnormality. The IoT module (6h) is connected to the control unit (6a).

4. A method for forced periodic discharge test of a safety valve in a pressurized boiler, characterized in that: The method of using the pressure boiler safety valve forced periodic discharge test system as described in claim 3 includes the following steps: Step 1. Preset the manual test time interval T and the allowable test pressure value P. After successful setting, start the countdown. Step 2. After the countdown ends, the control cabinet (6) issues an alarm signal indicating that the manual discharge test cycle of the safety valve has ended; Step 3. After the pressure boiler (1) is depressurized, the control cabinet (6) continuously reads the pressure reading and compares it with the pressure value P. If the pressure value changes from greater than the pressure value P to less than the pressure value P, the control cabinet (6) issues a warning signal that a manual discharge test can be performed. Step 4. Perform a manual discharge test on the safety valves. When it is detected that each safety valve (3) has been opened and there is medium discharged from the discharge port of each safety valve (3), the system records the completion time of the discharge test and the pressure of the boiler drum during the discharge test. Step 5. Reset the preset manual test time interval T and start the countdown for the next emission test.

5. A method for forced periodic discharge test of a safety valve in a pressurized boiler, characterized in that: The method of using the pressure boiler safety valve forced periodic discharge test system as described in claim 3 includes the following steps: Step 1. Use the timing device (6c) to preset the manual test time interval T and the allowable test pressure value P. After successful setting, the timing device (6c) starts counting down; Step 2. After the countdown of the timing device (6c) ends, the first signal command generator (6d) on the control cabinet (6) issues an alarm signal indicating that the manual discharge test cycle of the safety valve has ended; Step 3. After the pressure boiler (1) is depressurized, the control cabinet (6) continuously reads the pressure reading and compares it with the pressure value P. If the pressure value changes from greater than the pressure value P to less than the pressure value P, the second signal command generator (6e) on the control cabinet (6) issues a warning signal that a manual discharge test can be performed. Step 4. Perform a manual discharge test of the safety valve. When each position sensor (2) detects that the corresponding safety valve (3) has been opened, and each water vapor medium sensor (4) identifies that there is medium discharge, the control unit (6a) controls the first signal command generator (6d) and the second signal command generator (6e) to close, and the data storage (6g) records the completion time of the discharge test and the pressure of the boiler drum during the discharge test. Step 5. After detecting that the second signal command generator (6e) is turned off, the preset manual test time interval T of the timing device (6c) is reset, and the countdown for the next emission test is restarted.

6. A method for forced periodic discharge test of a safety valve in a pressurized boiler, characterized in that: The method of using the pressure boiler safety valve forced periodic discharge test system as described in claim 3 includes the following steps: Step 1. Use the timing device (6c) to preset the manual test time interval T and the allowable test pressure value P. After successful setting, the timing device (6c) starts counting down; Step 2. After the countdown of the timing device (6c) ends, the first signal command generator (6d) on the control cabinet (6) issues an alarm signal indicating that the manual discharge test cycle of the safety valve has ended; Step 3. After the pressure boiler (1) is depressurized, the control cabinet (6) continuously reads the pressure reading and compares it with the pressure value P. If the pressure value changes from greater than the pressure value P to less than the pressure value P, the second signal command generator (6e) on the control cabinet (6) issues a warning signal that a manual discharge test can be performed. Step 4. Perform a manual discharge test of the safety valve. When each position sensor (2) detects that the corresponding safety valve (3) has been opened, and each water vapor medium sensor (4) identifies that there is medium discharge, the control unit (6a) controls the first signal command generator (6d) and the second signal command generator (6e) to close, and the data storage (6g) records the completion time of the discharge test and the pressure of the boiler drum during the discharge test. Step 5. After detecting that the second signal command generator (6e) is turned off, the preset manual test time interval T of the timing device (6c) is reset, and the countdown for the next emission test is restarted. When the control unit (6a) detects that the safety valve (3) has been opened and the corresponding water vapor medium sensor (4) does not recognize that there is medium discharged from the vent of the safety valve (3), it determines that the safety valve (3) cannot release pressure normally and controls the third signal command generator (6f) to issue an alarm signal that it cannot release pressure normally, and at the same time controls the data storage (6g) to record the current time and boiler pressure.

7. The forced periodic discharge test method for the safety valve of a pressure boiler according to claim 6, characterized in that, Also includes: At any time during the countdown of the timing device (6c) before it ends, if the water vapor medium sensor (4) detects that a medium is being discharged, the third signal command generator (6f) is controlled to issue an alarm signal indicating that a leak or automatic start-up has occurred, and the data storage device (6g) is controlled to record the current time and boiler drum pressure.

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