Testing Device Applied to Water Spray Fire Extinguishing System of Nuclear Power Plant and Its Testing Method

Abstract

The present invention relates to a test device and a test method applied to the water spray fire extinguishing system of a nuclear power plant. The test device includes a test pipe, a first pressure transmitter and a second pressure transmitter installed on the test pipe. The first pressure transmitter is connected to a storage recorder, and the test pipe is connected to the water spray fire extinguishing system pipe network. The first pressure transmitter transmits the measured pressure value of the water spray fire extinguishing system pipe network to the storage recorder, and the second pressure transmitter monitors the pressure of the water spray fire extinguishing system pipe network. The storage recorder receives the pressure value transmitted by the first pressure transmitter, records and displays the change of the pressure of the water spray fire extinguishing system pipe network, forms a pressure change trend chart, and simultaneously receives the action signal of the solenoid valve of the deluge valve group. This system monitors in real time the response time, working pressure, and the pressure value after the system stabilizes of the water spray fire extinguishing system, ensures that the parameters of the water spray fire extinguishing system meet the requirements of the specifications and design, and guarantees the operation safety and economy of the entire protected area of the nuclear power plant.

Description

Technical Field

[0001] The invention relates to the field of water spray fire extinguishing system detection, and in particular to a testing device and a testing method for a water spray fire extinguishing system applied to a nuclear power plant. Background Art

[0002] The water spray fire extinguishing system includes two independent systems: the pre-action water sprinkler fire extinguishing system and the open water spray fire extinguishing system. It has three control modes: automatic, manual and mechanical emergency start. When the detector in the protection zone sends out a fire signal, it sends out an alarm to the fire detection alarm control panel to indicate the location of the fire. The fire detection alarm control panel immediately sends an opening command to the solenoid valve of the deluge valve group in the protection zone where the fire has occurred. The deluge valve group opens to spray water to the protection zone where the fire has occurred. At the same time, the fire detection alarm control panel receives the feedback signal of the deluge alarm valve group opening. In this process, the time from when the solenoid valve receives the opening command to when the water mist nozzle discharges water is the response time of the system. After the water mist nozzle discharges water, the nozzle pressure gradually rises and finally gradually stabilizes. The pressure-time characteristic curve of the water mist nozzle (such as Figure 1 As shown in the figure, it can be divided into the response section (0-A), the boost section (AB), and the voltage stabilization section (BC).

[0003] Response section (0-A): The process from the time when the solenoid valve of the deluge valve group receives the opening command from the fire detection alarm control panel to the time when the water mist nozzle starts to discharge water is called the response section. The time used for this process is the response time of the system. According to the requirements of the specification, the response time should not exceed 60s.

[0004] Boosting section (AB): After the system water mist nozzle discharges water, the pressure rises rapidly. This process is called the boosting section. The water mist nozzle quickly sprays water mist to extinguish the fire in the protected area.

[0005] Pressure stabilization section (BC): After the pressure rises to a certain value, it gradually stabilizes. This process is called the pressure stabilization section. At this time, stable water mist is formed at the nozzle, continuously providing fire extinguishing protection for the protected area.

[0006] According to the Technical Specifications for Water Spray Fire Extinguishing Systems (GB 50219-2014), the linkage test of the water spray fire extinguishing system shall meet the following requirements:

[0007] (1) The system is started by simulating fire signals. The corresponding zoned deluge alarm valves (or electric control valves, pneumatic control valves), pressure switches, fire pumps and other linkage equipment should be able to operate in time and send out corresponding signals;

[0008] (2) For systems that are activated by transmission pipes, when a sprinkler is activated, the corresponding zoned deluge alarm valve, pressure switch, fire pump and other linkage equipment should be able to operate in time and send out corresponding signals;

[0009] (3) The system's response time, operating pressure and flow rate should meet the design requirements.

[0010] The mandatory provisions in the specification require that the working pressure of the water mist nozzle should not be less than 0.35MPa when used for fire extinguishing and should not be less than 0.2MPa when used for protective cooling. The system response time is less than 60s. In response to the requirements in the specification, a test device was developed to measure the system's pressure, response time and other parameters to ensure that the various parameters of the water spray system meet the requirements of the national standard "Technical Specifications for Water Spray Fire Extinguishing Systems" (GB 50219-2014).

[0011] Since there is no special tool to measure the response time and other parameters of the water spray system, in accordance with the requirements of the system response time, working pressure and flow in the "Technical Specifications for Water Spray Fire Extinguishing Systems" (GB 50219-2014), it is urgent to develop a test device for the response time of the water spray fire extinguishing system in nuclear power plants, which can also monitor the system working pressure in real time to ensure that the various parameters of the water spray fire extinguishing system can meet the requirements of the specifications and design, and ensure the operating safety and economy of the entire protection area of ​​the nuclear power plant. Summary of the invention

[0012] The purpose of the present invention is to solve the defects of the prior art and provide a testing device and a testing method for a water spray fire extinguishing system of a nuclear power plant.

[0013] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0014] A test device for a water spray fire extinguishing system in a nuclear power plant comprises a test tube, a first pressure transmitter and a second pressure transmitter installed on the test tube, wherein the first pressure transmitter is connected to a storage recorder, the test tube is connected to a pipe network of the water spray fire extinguishing system, the first pressure transmitter transmits a pressure value of the pipe network of the water spray fire extinguishing system to the storage recorder, and the second pressure transmitter monitors the pressure of the pipe network of the water spray fire extinguishing system in real time;

[0015] The storage recorder receives the pressure value transmitted by the first pressure transmitter, records and displays the response time and pressure change of the water spray fire extinguishing system pipe network, forms a pressure change trend chart, and receives the action signal of the solenoid valve of the deluge valve group at the same time.

[0016] Furthermore, the first pressure transmitter, the second pressure transmitter and the storage recorder are all connected to a DC regulated power supply via a standard resistor.

[0017] Furthermore, the first pressure transmitter and the second pressure transmitter are arranged at the most unfavorable point of the pipeline protection zone in the main transformer and plant transformer area.

[0018] The test method of the test device applied to the water spray fire extinguishing system of a nuclear power plant comprises the following steps:

[0019] S1. Select a most unfavorable point (the most unfavorable point is the point with the smallest free water head in the fire protection network) in the pipe network protection area of ​​the main transformer and plant transformer area as the test point, and connect the test pipes with the first pressure transmitter and the second pressure transmitter installed to the pipe network;

[0020] S2. Connect the first pressure transmitter to the storage recorder through a standard resistor, and the first pressure transmitter feeds back the pressure value of the water spray fire extinguishing system pipe network to the storage recorder;

[0021] S3. Simulate the fire alarm signal of the main transformer and plant transformer area. The fire detection alarm control panel sends an opening command to the solenoid valve of the deluge valve group. The opening signal is transmitted to the connected storage recorder. After the solenoid valve is actuated, the water spray fire extinguishing system starts to take in water. After a period of time, the sprinkler starts to spray water. At the same time, the pipe network pressure in the system gradually rises. After reaching a certain value, the pressure begins to stabilize, and the protection area is sprayed stably. The storage recorder records the system response time, working pressure, and the pressure value after the system stabilizes;

[0022] S4. Compare the system response time, working pressure, and pressure value after the system stabilizes recorded by the storage recorder with the parameters required by the technical specifications of the water spray fire extinguishing system to determine whether the tested water spray fire extinguishing system pipeline network meets the parameter requirements. If it does not meet the parameter requirements, the water spray fire extinguishing system pipeline network shall be rectified.

[0023] Among them, the second pressure transmitter is used to observe the on-site pressure value, and to calibrate it with the pressure value sent to the storage recorder by the first pressure transmitter to ensure that the measured pressure is error-free.

[0024] The beneficial effects of the present invention are as follows: the system can monitor the response time, working pressure, and pressure value of the water spray fire extinguishing system after the system is stabilized in real time, ensuring that various parameters of the water spray fire extinguishing system can meet the requirements of specifications and designs, and ensuring the operating safety and economy of the entire protection area of ​​the nuclear power plant. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a pressure-time characteristic curve diagram of a water mist nozzle in the background technology of the present invention;

[0026] Figure 2 It is a schematic diagram of the structure of the present invention. DETAILED DESCRIPTION

[0027] like Figure 2As shown, the test device applied to the water spray fire extinguishing system of a nuclear power plant includes a test tube 1, a first pressure transmitter 2 and a second pressure transmitter 3 installed on the test tube 1, the first pressure transmitter 2 is connected to a storage recorder 4, the test tube 1 is connected to the water spray fire extinguishing system pipe network, the first pressure transmitter 2 transmits the pressure value of the water spray fire extinguishing system pipe network to the storage recorder 4, and the second pressure transmitter 3 monitors the pressure of the water spray fire extinguishing system pipe network in real time; the first pressure transmitter 2, the second pressure transmitter 3 and the storage recorder 4 are all connected to a DC voltage-stabilized power supply 6 through a standard resistor 5. Among them, the second pressure transmitter 3 is used to observe the on-site pressure value, and forms a calibration with the pressure value sent to the storage recorder 4 by the first pressure transmitter 2 to ensure that the measured pressure is error-free.

[0028] When in use, the storage recorder 4 receives the pressure value transmitted by the first pressure transmitter 2, records and displays the response time and pressure changes of the water spray fire extinguishing system network, forms a pressure change trend chart, and receives the action signal of the solenoid valve of the deluge valve group at the same time.

[0029] Among them, the test system equipment selection is as follows:

[0030] Device Name Model Specifications Range Accuracy Storage recorder 8861-50 / / Pressure transmitter / 0-25MPa Level 0.2 Pressure transmitter / 0-25MPa Level 0.5 DC current source 6220 / / Standard resistor BZ3 0-250Ω 0.01 level

[0031] The parameters of water spray fire extinguishing system are as follows:

[0032]

[0033] Furthermore, a test method for a test device for a water spray fire extinguishing system of a nuclear power plant comprises the following steps:

[0034] S1. Select a most unfavorable point (the most unfavorable point is the point with the smallest free water head in the fire protection network) in the pipe network protection area of ​​the main transformer and plant transformer area as the test point, remove the nozzle, connect the test pipe 1 installed with the first pressure transmitter 2 and the second pressure transmitter 3 to the pipe network, and then connect the removed nozzle to the end of the test pipe 1;

[0035] S2. Connect the first pressure transmitter 2 to the storage recorder 4 via the standard resistor 5. The first pressure transmitter 2 feeds back the pressure value of the water spray fire extinguishing system network to the storage recorder 4. Turn on the DC regulated power supply. At this time, the solenoid valve does not operate.

[0036] S3. Simulate the fire alarm signal of the main transformer and plant transformer area. The fire detection alarm control panel sends an opening command to the solenoid valve of the deluge valve group. The opening signal is transmitted to the connected storage recorder 4. After the solenoid valve is actuated, the water spray fire extinguishing system starts to take in water. After a period of time, the sprinkler starts to spray water. At the same time, the pipe network pressure in the system gradually rises. After reaching a certain value, the pressure begins to stabilize, and the protection area is sprayed stably. The storage recorder records the system response time, working pressure, and the pressure value after the system stabilizes;

[0037] S4. Compare the system response time, working pressure, and pressure value after the system stabilizes recorded by the storage recorder 4 with the parameters required by the technical specifications of the water spray fire extinguishing system to determine whether the tested water spray fire extinguishing system pipeline network meets the parameter requirements. If it does not meet the parameter requirements, the water spray fire extinguishing system pipeline network shall be rectified.

[0038] According to the above test method, the main transformer and plant transformer area of ​​Hualong One unit were used as test objects, and real spraying was carried out in the main transformer and plant transformer protection areas by simulating fire alarm signals, so as to measure the required data. The water source for this test was started by the fire water production system upstream to start the fire water pump, and water was introduced into the main transformer and plant transformer area through the GB ditch to meet the test requirements.

[0039] According to the timing starting from the action of the solenoid valve during the test, the water discharge from the water mist nozzle at the test point, and the data recorded by the storage recorder, the response time of the system is measured to be 14s. The Technical Specifications for Water Spray Fire Extinguishing Systems (GB 50219-2014) requires that the response time should be less than 60s, and the response time meets the national standard requirements.

[0040] After the system pressure stabilizes, its pressure value is 1.08MPa. The Technical Specifications for Water Spray Fire Extinguishing Systems (GB50219-2014) requires that the working pressure of the water mist nozzle should not be less than 0.35MPa when used for fire extinguishing. The system working pressure meets the national standard requirements.

[0041] By formula The calculated flow rate Q = 157.74 L / min (2.63 L / s). The flow rate of the water mist nozzle in the water spray system parameters is 89.8 L / min (1.50 L / s), which meets the flow rate required by the system.

[0042] According to the test results of the above test system, the response time and working pressure of the measurement system of this test device meet the national standard requirements. At the same time, the flow rate of the water mist nozzle is calculated to meet the design requirements of the Hualong One unit.

[0043] The system can monitor the response time, working pressure and pressure value of the water spray fire extinguishing system after the system stabilizes in real time, ensuring that the various parameters of the water spray fire extinguishing system meet the requirements of specifications and designs, and ensuring the operating safety and economy of the entire protection area of ​​the nuclear power plant.

[0044] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A test device applied to the water spray fire extinguishing system of a nuclear power plant, characterized in that, it includes a test pipe, a first pressure transmitter and a second pressure transmitter installed on the test pipe. The first pressure transmitter is connected to a storage recorder. The test pipe is connected to the water spray fire extinguishing system pipe network. The first pressure transmitter transmits the measured pressure value of the water spray fire extinguishing system pipe network to the storage recorder, and the second pressure transmitter monitors the pressure of the water spray fire extinguishing system pipe network in real time; the first pressure transmitter and the second pressure transmitter are arranged at the most unfavorable point of the pipe network protection area in the main transformer and plant transformer areas, and the most unfavorable point selected for the pipe network protection area is the point with the smallest free head in the fire fighting pipe network; the storage recorder receives the pressure value transmitted by the first pressure transmitter, records and displays the response time and pressure change of the water spray fire extinguishing system pipe network, forms a pressure change trend chart, and at the same time receives the action signal of the solenoid valve of the deluge valve group; the second pressure transmitter is used to observe the on-site pressure value, and forms a comparison with the pressure value sent by the first pressure transmitter to the storage recorder to ensure that there is no error in the measured pressure; using the test device for testing includes the following steps: S1. Select a most unfavorable point in the pipe network protection area of the main transformer and plant transformer areas as the point to be tested, and connect the test pipe installed with the first pressure transmitter and the second pressure transmitter to the pipe network; S2. Connect the first pressure transmitter to the storage recorder through a standard resistor, and the first pressure transmitter feeds back the pressure value of the water spray fire extinguishing system pipe network to the storage recorder; S3. Simulate the fire alarm signal in the main transformer and plant transformer areas. The fire detection and alarm control panel issues an opening instruction to the solenoid valve of the deluge valve group. This opening instruction is transmitted to the connected storage recorder. After the solenoid valve acts, the water spray fire extinguishing system starts to fill with water. After a period of time, the sprinkler head starts to spray water, and at the same time the pressure in the pipe network of the system gradually rises. After rising to a certain value, the pressure begins to stabilize, and stable spraying is achieved in the protection area. The storage recorder records the system response time, working pressure, and the pressure value after the system stabilizes; S4. Compare the system response time, working pressure, and the pressure value after the system stabilizes recorded by the storage recorder with the parameters required by the technical specifications of the water spray fire extinguishing system to determine whether the tested water spray fire extinguishing system pipe network meets the parameter requirements, and rectify the water spray fire extinguishing system pipe network that does not meet the parameter requirements.

2. The test device applied to the water spray fire extinguishing system of a nuclear power plant according to claim 1, characterized in that, the first pressure transmitter, the second pressure transmitter, and the storage recorder are all connected to a DC regulated power supply through standard resistors.

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