Fire detection system and method for iodine adsorber of nuclear power plant

Abstract

The invention relates to a fire detection system and method for an iodine adsorber of a nuclear power plant. The fire detection system comprises a first fire detector, a second fire detector, a fire detection loop, a master control room instrument platform, a DCS system and a master control room operation board platform, the first fire detector monitors the temperature of the iodine adsorber and outputs a first fire detection signal; the second fire detector performs smoke monitoring on the iodine adsorber and outputs a second fire detection signal; the fire detection loop generates an alarm signal based on the first fire detection signal and / or the second fire detection signal and sends the alarm signal to the main control room instrument platform and the DCS system. The main control room guitar platform outputs and displays alarm information; the DCS system outputs alarm information to a master control room operation board table; and the master control room operation board platform outputs and displays the alarm information. According to the invention, the fire hazard of the iodine adsorber on the air pipe section in the nuclear power plant can be effectively detected, the fire behavior of the iodine adsorber is monitored in real time, automatic linkage is realized, and the leakage of radioactive substances is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear power plant fire detection, and more particularly to an iodine adsorber fire detection system and method for a nuclear power plant. Background Art

[0002] The automatic fire alarm system of a nuclear power plant continuously monitors the protected area through fire detectors, can quickly detect fires and automatically alarm, provide the accurate location of the fire area, and monitor the development of the fire. Due to the presence of irradiated areas in the nuclear island plant, the ventilation system in the relevant areas needs to be equipped with iodine adsorbers to remove radioactive substances in the air or gas. The radiation absorption dose rate of the iodine adsorber during operation is 2.5×10 4 Gy / h, and should be able to withstand a cumulative absorbed dose of 8×10 5 Gy of gamma ray irradiation. Iodine adsorber is one of the main fire hazard sources in nuclear island plant, and fire detection means should be set up for it to detect fire in time and reduce the leakage of radioactive substances. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a nuclear power plant iodine adsorber fire detection system and method in view of the problems existing in the prior art.

[0004] The technical solution adopted by the present invention to solve the technical problem is: constructing a nuclear power plant iodine adsorber fire detection system, comprising: a first fire detector arranged in an upstream pipeline of the iodine adsorber, a second fire detector arranged in a downstream pipeline of the iodine adsorber, a fire detection circuit respectively connected to the first fire detector and the second fire detector, a main control room piano, a DCS system and a main control room operation panel;

[0005] The first fire detector is used to monitor the temperature of the iodine adsorber and output a first fire detection signal when the real-time temperature of the iodine adsorber is greater than a temperature threshold;

[0006] The second fire detector is used to monitor the smoke of the iodine adsorber and output a second fire detection signal when the real-time smoke of the iodine adsorber is greater than a set value;

[0007] The fire detection circuit is used to generate an alarm signal based on the first fire detection signal and / or the second fire detection signal when receiving the first fire detection signal and / or the second fire detection signal, and send the alarm signal to the main control room piano console and the DCS system respectively;

[0008] The main control room piano console is used to output and display alarm information based on the alarm signal;

[0009] The DCS system is used to output alarm information to the operation panel in the main control room based on the alarm signal;

[0010] The main control room operation panel is used to output and display the alarm information.

[0011] In the nuclear power plant iodine adsorber fire detection system of the present invention, the first fire detector comprises: a temperature sensor;

[0012] The temperature sensor is installed on the upstream pipeline of the iodine adsorber in an embedded manner.

[0013] In the nuclear power plant iodine adsorber fire detection system of the present invention, the second fire detector comprises: an air duct smoke detector or an aspirating smoke detector;

[0014] The air duct smoke detector and the aspirating smoke detector are both installed in an embedded manner on the downstream pipeline of the iodine adsorber.

[0015] In the nuclear power plant iodine adsorber fire detection system of the present invention, the fire detection circuit comprises: a first input module and a second input module;

[0016] The first input module is connected to the first fire detector and is used to receive the first fire detection signal and convert the first fire detection signal to obtain a first identification signal;

[0017] The second input module is connected to the second fire detector, and is used for receiving the second fire detection signal and converting the second fire detection signal to obtain a second identification signal.

[0018] In the nuclear power plant iodine adsorber fire detection system of the present invention, the fire detection circuit further comprises: a fire alarm controller;

[0019] The fire alarm controller is connected to the first input module and the second input module respectively, and is used to receive the first identification signal and / or the second identification signal, generate the alarm signal based on the first identification signal and / or the second identification signal, and send the alarm signal to the main control room console and the DCS system respectively.

[0020] The nuclear power plant iodine adsorber fire detection system of the present invention further includes: a logic control unit;

[0021] The logic control unit is connected to the fire controller and the DCS system respectively, and is used to generate a first trigger signal or a second trigger signal based on the alarm signal;

[0022] The DCS system outputs alarm information to the operation panel in the main control room according to the first trigger signal, or outputs an interlock control signal to an interlock valve according to the second trigger signal.

[0023] In the nuclear power plant iodine adsorber fire detection system of the present invention, the alarm signal comprises: a first alarm sub-signal and a second alarm sub-signal;

[0024] The logic control unit includes: a first logic module, a second logic module and a delay module;

[0025] The first logic module is connected to the fire alarm controller, and is used to output the first trigger signal when receiving the first alarm sub-signal and / or the second alarm sub-signal;

[0026] The second logic module is connected to the fire alarm controller, and is used to output the second trigger signal when receiving the first alarm sub-signal and the second alarm sub-signal;

[0027] The delay module performs delay processing on the second trigger signal and then transmits it to the DCS system.

[0028] In the nuclear power plant iodine adsorber fire detection system of the present invention, the first logic module is a first OR gate; the second logic module is a second OR gate;

[0029] The first OR gate is used to output the first trigger signal when receiving any one or more of the first alarm sub-signal and the second alarm sub-signal;

[0030] The second OR gate is used to output the second trigger signal when receiving the first alarm sub-signal and the second alarm sub-signal.

[0031] The present invention also provides a nuclear power plant iodine adsorber fire detection method, which is applied to the above-mentioned nuclear power plant iodine adsorber fire detection system, and comprises the following steps:

[0032] Performing temperature monitoring and smoke monitoring on the iodine adsorber to obtain the real-time temperature of the iodine adsorber and the real-time smoke generated by the iodine adsorber;

[0033] Determining whether a condition is met according to the real-time temperature and the real-time smoke;

[0034] If so, outputting a first fire detection signal and / or a second fire detection signal;

[0035] generating an alarm signal according to the first fire detection signal and / or the second fire detection signal;

[0036] Outputting and displaying alarm information on the piano console in the main control room based on the alarm signal;

[0037] Output alarm information to the operation panel in the main control room based on the alarm signal;

[0038] The main control room operation panel outputs and displays the alarm information.

[0039] In the nuclear power plant iodine adsorber fire detection method of the present invention, judging whether a condition is met according to the real-time temperature and the real-time smoke comprises:

[0040] comparing the real-time temperature with a temperature threshold;

[0041] If the real-time temperature is greater than the temperature threshold, it is determined that the condition is met;

[0042] Alternatively, the real-time smoke is compared with a set value;

[0043] If the real-time smoke is greater than the set value, it is determined that the condition is met.

[0044] In the nuclear power plant iodine adsorber fire detection method of the present invention, the alarm signal comprises: a first alarm sub-signal and a second alarm sub-signal;

[0045] The method further comprises:

[0046] generating a second trigger signal according to the first alarm signal and the second alarm sub-signal;

[0047] Performing delay processing on the second trigger signal and then outputting it to the DCS system;

[0048] The DCS system outputs an interlock control signal to the interlock valve based on the second trigger signal after delay processing.

[0049] In the nuclear power plant iodine adsorber fire detection method of the present invention, generating an alarm signal according to the first fire detection signal and / or the second fire detection signal comprises:

[0050] converting and processing the first fire detection signal to obtain a first identification signal;

[0051] generating the first alarm sub-signal according to the first identification signal;

[0052] Alternatively, generating an alarm signal according to the first fire detection signal and / or the second fire detection signal includes:

[0053] converting the second fire detection signal to obtain a second identification signal;

[0054] The second alarm sub-signal is generated according to the second identification signal.

[0055] The iodine adsorber fire detection system and method for a nuclear power plant implemented in the present invention has the following beneficial effects: comprising a first fire detector, a second fire detector, a fire detection circuit, a main control room console, a DCS system and a main control room operation panel; the first fire detector monitors the temperature of the iodine adsorber and outputs a first fire detection signal; the second fire detector monitors the smoke of the iodine adsorber and outputs a second fire detection signal; the fire detection circuit generates an alarm signal based on the first fire detection signal and / or the second fire detection signal and sends it to the main control room console and the DCS system respectively; the main control room console outputs and displays the alarm information; the DCS system outputs the alarm information to the main control room operation panel; the main control room operation panel outputs and displays the alarm information. The present invention can effectively detect fires occurring in iodine adsorbers on the air duct section of a nuclear power plant, monitor the fire conditions of the iodine adsorbers in real time and realize automatic linkage, thereby reducing the leakage of radioactive substances. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0057] Figure 1 It is a schematic diagram of the nuclear power plant iodine adsorber fire detection system provided by the present invention;

[0058] Figure 2 It is a linkage logic diagram of iodine adsorber fire detection provided by the present invention;

[0059] Figure 3 The present invention is a schematic flow chart of a method for detecting fire in an iodine adsorber of a nuclear power plant. DETAILED DESCRIPTION

[0060] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0061] In order to realize effective fire detection of iodine adsorber in nuclear power plant, the present invention fully considers the particularity of iodine adsorber, and installs corresponding fire detectors on the upstream and downstream wind pipes of iodine adsorber. Among them, the combustion product detector is arranged at the downstream of iodine adsorber, and the temperature detector is arranged at the upstream of iodine adsorber.

[0062] Specifically, in one embodiment, Figure 1As shown, the iodine adsorber fire detection system of the nuclear power plant includes: a first fire detector arranged in the upstream pipeline of the iodine adsorber, a second fire detector arranged in the downstream pipeline of the iodine adsorber, a fire detection circuit respectively connected to the first fire detector and the second fire detector, a main control room console, a DCS system (nuclear power plant distributed control system) and a main control room operation panel.

[0063] Among them, the first fire detector is used to monitor the temperature of the iodine adsorber, and output a first fire detection signal when the real-time temperature of the iodine adsorber is greater than the temperature threshold; the second fire detector is used to monitor the smoke of the iodine adsorber, and output a second fire detection signal when the real-time smoke of the iodine adsorber is greater than a set value; the fire detection circuit is used to generate an alarm signal based on the first fire detection signal and / or the second fire detection signal when receiving the first fire detection signal and / or the second fire detection signal, and send the alarm signal to the main control room console and the DCS system respectively; the main control room console is used to output and display alarm information based on the alarm signal; the DCS system is used to output alarm information to the main control room operation panel based on the alarm signal; the main control room operation panel is used to output and display the alarm information.

[0064] In the embodiment of the present invention, by setting a first fire detector in the upstream pipeline of the iodine adsorber, the temperature of the iodine adsorber can be monitored in real time, and at any time, when the real-time temperature in the iodine adsorber reaches a preset temperature threshold (generally about 80°C), the first fire detector responds quickly and outputs a first detection signal. Wherein, the first fire detection signal is a switch action signal. The first fire detection signal is transmitted to the fire detection circuit, which receives and identifies the corresponding alarm signal and generates the alarm signal. The alarm signal is transmitted in two ways, one way is transmitted to the piano table in the main control room to display the alarm information, and the other way is transmitted to the DCS system, which is output to the operation panel in the main control room by the DCS system, and the alarm information is output and displayed by the operation panel in the main control room. Wherein, the alarm information includes: equipment information, coding information, etc. of the first fire detector, and the position of the iodine adsorber with too high temperature can be determined by the equipment information (such as model, etc.) and coding information of the first fire detector.

[0065] In the embodiment of the present invention, by arranging the second fire detector in the downstream pipeline of the iodine adsorber, it is possible to realize real-time monitoring of the smoke generated by the iodine adsorber, and at any time, when the smoke generated by the iodine adsorber enters the second fire detector with the air flow in the air duct, and when the smoke generated is greater than the set value, the second fire detector triggers the generation of the second fire detection signal. Similarly, the second fire detection signal is a switch quantity action signal. The second fire detection signal is transmitted to the fire detection circuit, and the corresponding alarm signal is received and identified by the fire detection circuit. The alarm signal is transmitted in two ways, one way is transmitted to the piano table in the main control room to display the alarm information, and the other way is transmitted to the DCS system, and the DCS system is output to the operation panel in the main control room, and the alarm information is output and displayed by the operation panel in the main control room. Similarly, the alarm information includes: equipment information, coding information, etc. of the second fire detector, and the position of the iodine adsorber with too high temperature can be determined by the equipment information (such as model, etc.) and coding information of the first fire detector.

[0066] Optionally, in an embodiment of the present invention, the first fire detector includes: a temperature sensor; the temperature sensor is installed in an embedded manner on the upstream pipeline of the iodine adsorber. By installing the temperature sensor in an embedded manner, the temperature sensor can be completely fitted with the air duct to avoid leakage of radioactive substances.

[0067] Optionally, in an embodiment of the present invention, the second fire detector includes: an air duct smoke detector or an aspirating smoke detector; the air duct smoke detector and the aspirating smoke detector are both installed in an embedded manner on the downstream pipeline of the iodine adsorber. By installing the air duct smoke detector or the aspirating smoke detector in an embedded manner, the air duct smoke detector or the aspirating smoke detector can be completely fitted with the air duct to avoid leakage of radioactive substances.

[0068] In the embodiment of the present invention, the duct smoke detector and the aspirating smoke detector are selected according to the air flow velocity in the duct. The specific selection method is: when the air flow velocity in the duct is greater than or equal to 5m / s, the aspirating smoke detector is used, otherwise the duct smoke detector is used.

[0069] In an embodiment of the present invention, the fire detection circuit includes: a first input module and a second input module; the first input module is connected to the first fire detector, and is used to receive a first fire detection signal and convert the first fire detection signal to obtain a first identification signal; the second input module is connected to the second fire detector, and is used to receive a second fire detection signal and convert the second fire detection signal to obtain a second identification signal.

[0070] Specifically, the main function of the first input module is to convert the first fire detection signal into a signal recognizable by the fire alarm controller. Similarly, the main function of the second input module is to convert the second fire detection signal into a signal recognizable by the fire alarm controller. It should be noted that the first input module and the second input module used in the embodiment of the present invention are universal input modules in the fire detection system of a nuclear power plant, and their purpose is to convert the detection signal generated by the detector into a signal that can be recognized and read by the fire alarm controller in the fire detection circuit.

[0071] Furthermore, in an embodiment of the present invention, the fire detection circuit also includes: a fire alarm controller; the fire alarm controller is connected to the first input module and the second input module respectively, for receiving a first identification signal and / or a second identification signal, generating an alarm signal based on the first identification signal and / or the second identification signal, and sending the alarm signal to the main control room console and the DCS system respectively.

[0072] Furthermore, in the embodiment of the present invention, the fire detection circuit also includes: a plurality of fire detection devices, which form a fire detection circuit with the first input module, the second input module and the fire alarm controller. The plurality of fire detection devices are used to monitor fires in other systems or equipment of the nuclear power plant. It should be noted that the fire alarm controller and the fire detection device in the embodiment of the present invention can be the fire alarm controller and the fire detection device in the fire detection system of the nuclear power plant, and the present invention does not make any specific limitation.

[0073] In the embodiment of the present invention, a temperature sensor is installed upstream of the iodine adsorber and is completely fitted to the air duct to prevent leakage of radioactive substances. At any time, when the temperature in the iodine adsorber reaches a preset temperature threshold of 80°C, the temperature sensor will respond quickly, output a switch action signal to transmit to the first input module, and the first input module is connected in series with other fire detection equipment to form a fire detection circuit. After the fire alarm controller receives the alarm signal of the temperature sensor in the iodine adsorber through the detection circuit, it further displays the signal through the main control room piano, and at the same time sends the alarm signal to the main control room operation panel through the DCS system for display, informing the main control room operator that the temperature in the iodine adsorber is too high and corresponding measures should be taken.

[0074] The solution of installing smoke detectors downstream of the iodine adsorber is adopted. The smoke detectors (duct smoke detectors or aspirated smoke detectors) can be embedded in the iodine adsorber duct to achieve complete fit and avoid leakage of radioactive substances. In the early stage of a fire, the smoke generated by the combustion of the iodine adsorber flows into the duct smoke detector or aspirated smoke detector along with the air flow in the duct, thereby triggering the fire alarm signal to be output to the second input module. The second input module is connected in series with other fire detection equipment to form a fire detection circuit. The fire alarm controller receives the fire alarm signal from the duct smoke detector or aspirated smoke detector through the detection circuit. After receiving the alarm signal, the fire alarm controller further displays the signal through the piano in the main control room, and at the same time sends the alarm signal to the main control room operation panel through the DCS system for display, informing the main control room operator that the detector in the iodine adsorber has triggered the fire alarm signal and corresponding measures should be taken.

[0075] Further, in the embodiment of the present invention, if Figure 1 As shown, the iodine adsorber fire detection system of the nuclear power plant also includes: a logic control unit; the logic control unit is connected to the fire controller and the DCS system respectively, and is used to generate a first trigger signal or a second trigger signal based on the alarm signal; the DCS system outputs alarm information to the main control room operation panel according to the first trigger signal, or outputs an interlock control signal to the interlock valve according to the second trigger signal.

[0076] In the embodiment of the present invention, the alarm signal includes: a first alarm sub-signal and a second alarm sub-signal; the logic control unit includes: a first logic module, a second logic module and a delay module.

[0077] Specifically, the first logic module is connected to the fire alarm controller, and is used to output a first trigger signal when receiving the first alarm sub-signal and / or the second alarm sub-signal; the second logic module is connected to the fire alarm controller, and is used to output a second trigger signal when receiving the first alarm sub-signal and the second alarm sub-signal; the delay module delays the second trigger signal and transmits it to the DCS system. It should be noted that in the embodiment of the present invention, the logic control unit can be an independently set module or built into the DCS system. Generally, it is preferred to build it into the DCS system.

[0078] Optionally, in an embodiment of the present invention, Figure 2 As shown, the first logic module is a first OR gate (ie Figure 2 The second logic module is the second OR gate (i.e. Figure 2 2). XJDTxxxxSTF is a first alarm sub-signal output based on a first fire detection signal generated by an upstream temperature sensor, and XJDTxxxxDTF is a second alarm sub-signal output based on a second fire detection signal generated by a downstream smoke detector.

[0079] The first OR gate is used to output the first trigger signal when receiving any one or more of the first alarm sub-signal and the second alarm sub-signal; the second OR gate is used to output the second trigger signal when receiving the first alarm sub-signal and the second alarm sub-signal. Figure 2 As shown in the figure, when one of the upstream temperature sensor and the downstream smoke detector (duct smoke detector or aspirating smoke detector) detects a fire, an alarm is triggered and displayed on the control panel of the main control room through the DCS. At the same time, the alarm is also displayed on the piano in the main control room to remind the operator to pay attention and conduct verification work. When both the upstream temperature sensor and the downstream smoke detector detect a fire, after a delay of T1 (usually a few seconds), the DCS system automatically interlocks the valve to control the scope of the fire.

[0080] It should be noted that the main control room piano console mentioned in the present invention is an operation and display console arranged in the fire alarm main control room.

[0081] refer to Figure 3 , Figure 3 The invention provides a method for detecting iodine adsorber fire in a nuclear power plant. The method for detecting iodine adsorber fire in a nuclear power plant is applied to an iodine adsorber fire detection system for a nuclear power plant disclosed in an embodiment of the invention.

[0082] Specifically, Figure 3 As shown, the nuclear power plant iodine adsorber fire detection method comprises the following steps:

[0083] Step S301: performing temperature monitoring and smoke monitoring on the iodine adsorber to obtain the real-time temperature of the iodine adsorber and the real-time smoke generated by the iodine adsorber.

[0084] Step S302: Determine whether the conditions are met based on the real-time temperature and real-time smoke.

[0085] In an embodiment of the present invention, judging whether a condition is met based on the real-time temperature and the real-time smoke includes: comparing the real-time temperature with a temperature threshold; if the real-time temperature is greater than the temperature threshold, judging that the condition is met; or, comparing the real-time smoke with a set value; if the real-time smoke is greater than the set value, judging that the condition is met.

[0086] Step S303: If yes, output the first fire detection signal and / or the second fire detection signal.

[0087] Step S304: Generate an alarm signal according to the first fire detection signal and / or the second fire detection signal.

[0088] In an embodiment of the present invention, generating an alarm signal based on the first fire detection signal and / or the second fire detection signal includes: converting the first fire detection signal to obtain a first identification signal; generating a first alarm sub-signal based on the first identification signal; or, generating an alarm signal based on the first fire detection signal and / or the second fire detection signal includes: converting the second fire detection signal to obtain a second identification signal; generating a second alarm sub-signal based on the second identification signal.

[0089] Step S305: Based on the alarm signal, the alarm information is output and displayed on the piano console in the main control room.

[0090] Step S306: Output alarm information to the operation panel in the main control room based on the alarm signal.

[0091] Step S307: The main control room operation panel outputs and displays the alarm information.

[0092] Furthermore, in an embodiment of the present invention, the nuclear power plant iodine adsorber fire detection method also includes: generating a second trigger signal based on the first alarm signal and the second alarm sub-signal; delaying the second trigger signal and outputting it to the DCS system; the DCS system outputs an interlock control signal to the interlock valve based on the second trigger signal after delay processing.

[0093] The present invention can effectively detect fires in iodine adsorbers with high radiation in air duct sections of nuclear power plants, monitor the fire conditions of iodine adsorbers in real time and realize automatic linkage, so as to timely discover and reduce the leakage of radioactive substances.

[0094] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0095] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0096] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0097] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot limit the scope of protection of the present invention. All equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A nuclear power plant iodine adsorber fire detection system, characterized in that: include: A first fire detector arranged in an upstream pipeline of the iodine adsorber, a second fire detector arranged in a downstream pipeline of the iodine adsorber, a fire detection circuit respectively connected to the first fire detector and the second fire detector, a main control room piano, a DCS system and a main control room operation panel; The first fire detector is used to monitor the temperature of the iodine adsorber and output a first fire detection signal when the real-time temperature of the iodine adsorber is greater than a temperature threshold; The second fire detector is used to monitor the smoke of the iodine adsorber and output a second fire detection signal when the real-time smoke of the iodine adsorber is greater than a set value; The fire detection circuit is used to generate an alarm signal based on the first fire detection signal and / or the second fire detection signal when receiving the first fire detection signal and / or the second fire detection signal, and send the alarm signal to the main control room piano console and the DCS system respectively; The main control room piano console is used to output and display alarm information based on the alarm signal; The DCS system is used to output alarm information to the operation panel in the main control room based on the alarm signal; The main control room operation panel is used to output and display the alarm information.

2. The iodine adsorber fire detection system for a nuclear power plant according to claim 1, characterized in that: The first fire detector comprises: a temperature sensor; The temperature sensor is installed on the upstream pipeline of the iodine adsorber in an embedded manner.

3. The nuclear power plant iodine adsorber fire detection system according to claim 1, characterized in that: The second fire detector includes: an air duct smoke detector or an aspirating smoke detector; The air duct smoke detector and the aspirating smoke detector are both installed in an embedded manner on the downstream pipeline of the iodine adsorber.

4. The iodine adsorber fire detection system for a nuclear power plant according to claim 1, characterized in that: The fire detection circuit comprises: a first input module and a second input module; The first input module is connected to the first fire detector and is used to receive the first fire detection signal and convert the first fire detection signal to obtain a first identification signal; The second input module is connected to the second fire detector, and is used for receiving the second fire detection signal and converting the second fire detection signal to obtain a second identification signal.

5. The iodine adsorber fire detection system for a nuclear power plant according to claim 4, characterized in that: The fire detection circuit also includes: a fire alarm controller; The fire alarm controller is connected to the first input module and the second input module respectively, and is used to receive the first identification signal and / or the second identification signal, generate the alarm signal based on the first identification signal and / or the second identification signal, and send the alarm signal to the main control room console and the DCS system respectively.

6. The iodine adsorber fire detection system for a nuclear power plant according to claim 5, characterized in that: Also includes: Logic control unit; The logic control unit is connected to the fire controller and the DCS system respectively, and is used to generate a first trigger signal or a second trigger signal based on the alarm signal; The DCS system outputs alarm information to the operation panel in the main control room according to the first trigger signal, or outputs an interlock control signal to an interlock valve according to the second trigger signal.

7. The iodine adsorber fire detection system for a nuclear power plant according to claim 6, characterized in that: The alarm signal includes: a first alarm sub-signal and a second alarm sub-signal; The logic control unit includes: a first logic module, a second logic module and a delay module; The first logic module is connected to the fire alarm controller, and is used to output the first trigger signal when receiving the first alarm sub-signal and / or the second alarm sub-signal; The second logic module is connected to the fire alarm controller, and is used to output the second trigger signal when receiving the first alarm sub-signal and the second alarm sub-signal; The delay module performs delay processing on the second trigger signal and then transmits it to the DCS system.

8. The iodine adsorber fire detection system for a nuclear power plant according to claim 7, characterized in that: The first logic module is a first OR gate; the second logic module is a second OR gate; The first OR gate is used to output the first trigger signal when receiving any one or more of the first alarm sub-signal and the second alarm sub-signal; The second OR gate is used to output the second trigger signal when receiving the first alarm sub-signal and the second alarm sub-signal.

9. A method for detecting iodine adsorber fire in a nuclear power plant, applied to the iodine adsorber fire detection system in a nuclear power plant according to any one of claims 1 to 8, characterized in that: The following steps are involved: Performing temperature monitoring and smoke monitoring on the iodine adsorber to obtain the real-time temperature of the iodine adsorber and the real-time smoke generated by the iodine adsorber; Determining whether a condition is met according to the real-time temperature and the real-time smoke; If so, outputting a first fire detection signal and / or a second fire detection signal; generating an alarm signal according to the first fire detection signal and / or the second fire detection signal; Outputting and displaying alarm information on the piano console in the main control room based on the alarm signal; Output alarm information to the operation panel in the main control room based on the alarm signal; The main control room operation panel outputs and displays the alarm information.

10. The method for detecting fire in an iodine adsorber of a nuclear power plant according to claim 9, characterized in that: The determining whether a condition is met according to the real-time temperature and the real-time smoke comprises: comparing the real-time temperature with a temperature threshold; If the real-time temperature is greater than the temperature threshold, it is determined that the condition is met; Alternatively, the real-time smoke is compared with a set value; If the real-time smoke is greater than the set value, it is determined that the condition is met.

11. The method for detecting fire in an iodine adsorber of a nuclear power plant according to claim 9, characterized in that: The alarm signal includes: a first alarm sub-signal and a second alarm sub-signal; The method further comprises: generating a second trigger signal according to the first alarm signal and the second alarm sub-signal; Performing delay processing on the second trigger signal and then outputting it to the DCS system; The DCS system outputs an interlock control signal to the interlock valve based on the second trigger signal after delay processing.

12. The method for detecting fire in an iodine adsorber of a nuclear power plant according to claim 11, characterized in that: Generating an alarm signal according to the first fire detection signal and / or the second fire detection signal comprises: converting and processing the first fire detection signal to obtain a first identification signal; generating the first alarm sub-signal according to the first identification signal; Alternatively, generating an alarm signal according to the first fire detection signal and / or the second fire detection signal includes: converting the second fire detection signal to obtain a second identification signal; The second alarm sub-signal is generated according to the second identification signal.

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