Nuclear power oxygen measurement automatic sampling detection device and system

Abstract

The invention relates to an automatic sampling and detecting device and system for nuclear power oxygen measurement, in particular to real-time online monitoring of the oxygen content and the water temperature of water in a secondary loop during the first auxiliary steam oxygen removal period of a deaerator and the thermal state flushing stage of the secondary loop. Through cooperative work of the temperature detection module and the oxygen content detection module, the temperature value and the oxygen content value of the sample water can be obtained in time, and therefore it is ensured that the water quality meets the operation requirement. When the temperature of the sample water exceeds the preset highest temperature value, the system can automatically cut off the sample water flowing into the oxygen content detection module and directly discharge the high-temperature sample water, so that damage caused by a device or a mechanism for measuring the oxygen content of the high-temperature sample water is avoided. By means of the automatic control, the safety of the system is improved, and the requirement for manual intervention is reduced.

Description

Technical Field

[0001] The invention relates to the field of nuclear power, and in particular to an automatic sampling and detection device and system for measuring oxygen in nuclear power. Background Art

[0002] During the commissioning and operation of a nuclear power plant, especially during the first auxiliary steam deoxidation of the deaerator and the hot flushing stage of the secondary circuit, it is crucial to monitor the oxygen content of the secondary circuit water in real time. This helps to ensure that the water quality meets the operating requirements and prevents the system operation from being affected or even hindering the normal operation of the unit due to excessive dissolved oxygen content in the water.

[0003] However, in current actual operation, the conventional island chemical sampling system (SIT) is not available when needed due to delayed installation or late handover. Therefore, it is impossible to monitor the oxygen content in the secondary circuit water quality in real time through the SIT system. However, when sampling temporarily on site, the sample water temperature is very high (usually above 100°C), and the oxygen measuring instrument is easily damaged when testing the sample water with too high temperature, and the high temperature can easily scald the staff.

[0004] In addition, existing temporary sampling devices also have some obvious shortcomings. First, they cannot provide continuous, real-time monitoring of water quality oxygen content; second, such devices lack the function of real-time monitoring of sample water temperature, making it impossible for operators to understand the temperature of the sample in time; finally, when encountering high-temperature sample water, the traditional temporary sampling rack can only manually close the sampling valve to avoid danger, but cannot automatically cut off the sampling circuit, which can easily damage the oxygen content detection module. Summary of the invention

[0005] The present invention aims at solving the above-mentioned technical problems and provides a nuclear power oxygen automatic sampling and detection device and system.

[0006] The present invention provides a nuclear power oxygen measurement automatic sampling and detection device, which comprises:

[0007] Obtain sample water from the pipe between the deaerator and the recirculation pump inlet;

[0008] The sample water is introduced into the temperature detection module and the oxygen content detection module successively, the temperature value of the sample water is obtained through the temperature detection module, and the oxygen content value of the sample water is obtained through the oxygen content detection module;

[0009] If the sample water temperature value is greater than or equal to the preset maximum sample water temperature value, the sample water is directly discharged after passing through the temperature detection module to avoid the sample water passing through the oxygen content detection module;

[0010] If the sample water temperature value is lower than the preset maximum sample water temperature value, the sample water is completely introduced into the oxygen content detection module after flowing out of the temperature detection module and then discharged.

[0011] Preferably, the temperature detection module comprises a double upper limit electric contact thermometer, and the double upper limit electric contact thermometer is used to monitor the sample water temperature in real time to obtain the sample water temperature value.

[0012] Preferably, a sampling branch and a bypass branch are arranged in parallel after the temperature detection module, and the oxygen content detection module is arranged on the sampling branch;

[0013] If the sample water temperature value is greater than or equal to the preset maximum sample water temperature value, the sampling branch is cut off and the bypass branch is opened;

[0014] If the sample water temperature value is less than the preset maximum sample water temperature value, the sampling branch is opened and the bypass branch is cut off.

[0015] Preferably, a normally open sampling solenoid valve is provided on the sampling branch, and a normally closed bypass solenoid valve is provided on the bypass branch;

[0016] When the sample water temperature value is greater than or equal to the preset maximum sample water temperature value, the normally open sampling solenoid valve is closed to cut off the sample water flowing into the oxygen content detection module, and the normally closed bypass solenoid valve is opened to discharge the sample water;

[0017] When the sample water temperature value is less than the preset maximum sample water temperature value, the normally open sampling solenoid valve remains in an open state, and the normally closed bypass solenoid valve remains in a closed state, so that the sample water is completely introduced into the oxygen content detection module and then discharged.

[0018] Preferably, the oxygen content detection module includes an oxygen meter, a polarographic oxygen meter, a fluorescence oxygen meter, an optical oxygen meter or a conductivity oxygen meter.

[0019] Preferably, if the sample water temperature value is greater than or equal to a preset maximum sample water temperature value, the sample water flowing into the oxygen content detection module is cut off, and the sample water is discharged to the conventional island waste liquid collection system of the nuclear power plant after it flows out of the temperature detection module;

[0020] If the sample water temperature value is less than the preset maximum sample water temperature value, the sample water is completely introduced into the oxygen content detection module after flowing out of the temperature detection module and then discharged from the conventional island waste liquid collection system of the nuclear power plant.

[0021] Preferably, before introducing the sample water into the temperature detection module, the method further comprises:

[0022] The sample water is cooled and then introduced into the temperature detection module.

[0023] Preferably, cooling the sample water comprises:

[0024] Obtain cooling water from the closed-circuit cooling water system of the conventional island of a nuclear power plant;

[0025] The sample water and the cooling water are respectively introduced into the heat exchanger, so that the sample water is heat exchanged by the cooling water.

[0026] The present invention also provides a nuclear power oxygen sampling detection system, which comprises:

[0027] A sampling pipeline group connected to the pipeline between the deaerator and the recirculation pump inlet;

[0028] A sampling detection device, comprising a temperature detection module and an oxygen content detection module, wherein the temperature detection module and the oxygen content detection module are arranged one by one on the sampling pipeline group along the flow direction of the sample water, the temperature detection module is used to detect the temperature of the sample water to obtain the sample water temperature value, and the oxygen content detection module is used to detect the oxygen content of the sample water to obtain the sample water oxygen content value; and

[0029] The control device is used to read the sample water temperature value in real time, and control the sample water flowing out of the temperature detection module to be introduced into the oxygen content detection module or directly discharged according to the sample water temperature value.

[0030] Preferably, the sampling pipeline group includes a main pipeline and a sampling branch, one end of the main pipeline is connected to the pipeline between the deaerator and the inlet of the recirculation pump, the other end of the main pipeline is connected to one end of the temperature detection module, the sampling branch is connected to the other end of the temperature detection module, and the oxygen content detection module is arranged on the sampling branch.

[0031] Preferably, the sampling pipeline group further includes a bypass branch, and the bypass branch is connected in parallel to the temperature detection module.

[0032] Preferably, the control device comprises a normally open sampling solenoid valve and a normally closed bypass solenoid valve, wherein the normally open sampling solenoid valve is arranged on the sampling branch, and the normally closed bypass solenoid valve is arranged on the bypass branch;

[0033] When the sample water temperature value is greater than or equal to the preset maximum sample water temperature value, the normally open sampling solenoid valve is closed to cut off the sampling branch, and the normally closed bypass solenoid valve is opened to open the bypass branch;

[0034] When the sample water temperature value is less than the preset maximum sample water temperature value, the normally open sampling solenoid valve is opened to open the sampling branch, and the normally closed bypass solenoid valve is closed to cut off the bypass branch.

[0035] Preferably, the control device further comprises a controller, and the controller is electrically connected to the normally open sampling solenoid valve, the normally closed bypass solenoid valve and the temperature detection module.

[0036] Preferably, the nuclear power oxygen sampling and detection system further comprises a cooler, which is arranged on the sampling pipeline group and is used to cool the sample water.

[0037] Preferably, the cooler comprises a heat exchanger, which is arranged on the sampling pipe group, the first circuit of the heat exchanger is connected to the sampling pipe group, and the second circuit of the heat exchanger is connected to the conventional island closed-loop cooling water system of the nuclear power plant.

[0038] Preferably, the nuclear power oxygen sampling and detection system further comprises a sampling valve, and the sampling valve and the temperature detection module are arranged one by one on the sampling pipeline group along the flow direction of the sample water.

[0039] Preferably, the oxygen content detection module comprises an oxygen meter, and the oxygen meter is arranged on the sampling pipeline group.

[0040] The implementation of the present invention has the following beneficial effects:

[0041] The present invention relates to an automatic sampling and detection device and system for measuring oxygen in nuclear power plants, and in particular, to achieve real-time online monitoring of the oxygen content and water temperature of the secondary circuit water quality during the first auxiliary steam deoxygenation of the deaerator and the hot flushing stage of the secondary circuit. Through the coordinated work of the temperature detection module and the oxygen content detection module, the temperature value and oxygen content value of the sample water can be obtained in time, thereby ensuring that the water quality meets the operation requirements.

[0042] When the sample water temperature exceeds the preset maximum temperature value, the system can automatically cut off the sample water flowing into the oxygen content detection module and directly discharge the high-temperature sample water to avoid damage caused by the device or mechanism used to measure the oxygen content of the high-temperature sample water. This automatic control not only improves the safety of the system, but also reduces the need for manual intervention.

[0043] Furthermore, the present invention can not only detect the oxygen content of the sample water in real time through the oxygen content detection module, but also detect the temperature of the sample water in real time through the temperature detection module, thereby providing continuous and real-time sample water oxygen content values ​​and sample water temperature values ​​to the user; further, when the pressure water supply temperature is too high, the sample water flowing to the oxygen content detection module will be cut off, thereby preventing the oxygen content detection module from being damaged due to the excessively high sample water temperature, thereby improving the durability of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0045] Figure 1 It is a flow chart of the automatic sampling and detection device for measuring oxygen in nuclear power of the present invention;

[0046] Figure 2 It is a structural schematic diagram of the nuclear power oxygen measurement sampling and detection system of the present invention. DETAILED DESCRIPTION

[0047] Embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0048] It should be understood that although the terms "first", "second", "third", etc. may be used to describe various information in the present invention, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0049] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0050] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] Figure 1 The invention provides a nuclear power oxygen automatic sampling and detection device in some embodiments, which includes:

[0052] Obtain sample water from the pipe between the deaerator and the recirculation pump inlet;

[0053] Understandably, in the cooling system of a nuclear power plant, a suitable position between the outlet of the deaerator and the inlet of the recirculation pump is selected as the sampling point. This position should ensure that the sampled water can be obtained.

[0054] The sampled water is successively introduced into the temperature detection module and the oxygen content detection module. The temperature value of the sampled water is obtained through the temperature detection module, and the oxygen content value of the sampled water is obtained through the oxygen content detection module.

[0055] Understandably, the temperature detection module is used to detect the temperature of the sampled water in real time, and the oxygen content detection module is used to detect the oxygen content of the sampled water.

[0056] If the temperature value of the sampled water is greater than or equal to the preset maximum sampled water temperature value, the sampled water is directly discharged after flowing through the temperature detection module, avoiding the sampled water flowing through the oxygen content detection module.

[0057] If the temperature value of the sampled water is less than the preset maximum sampled water temperature value, the sampled water is completely introduced into the oxygen content detection module after flowing out of the temperature detection module and then discharged.

[0058] Understandably, a safety upper limit temperature Tmax is set according to experiments or manufacturer recommendations. When the sample water temperature reaches or exceeds this temperature, it is considered that downstream sensitive components such as the oxygen content detection module may be damaged.

[0059] It should be noted that when the sampled water temperature detection result shows that the sample water temperature ≥ Tmax: the cut-off mechanism is activated to prevent the overheated sampled water from flowing to the oxygen content detection module. At the same time, the bypass drainage path is opened to directly discharge the sampled water with inappropriate temperature out of the system without passing through the oxygen content detection, avoiding the overheated sampled water flowing through the oxygen content detection module and causing damage to the oxygen content detection module.

[0060] Conversely, if the sample water temperature < Tmax: the sampled water at appropriate temperature is allowed to pass through the entire detection process smoothly until final discharge.

[0061] Such as Figure 1 and Figure 2 As shown, in some embodiments of the nuclear power oxygen measurement automatic sampling detection device, the temperature detection module includes a double upper limit electric contact thermometer, and the double upper limit electric contact thermometer is used to monitor the temperature of the sampled water in real time to obtain the temperature value of the sampled water.

[0062] Understandably, the double upper limit electric contact thermometer is a temperature sensor with two control outputs.

[0063] When the temperature of the sampled water reaches the first preset temperature upper limit value Tmax1, the first electric contact closes, triggering a first-level alarm or performing a specific operation (for example, turning on the cooling device or energizing the solenoid valve).

[0064] If the sample water temperature continues to rise and reaches a second higher preset temperature upper limit Tmax2, the second electrical contact closes, triggering a higher level alarm or executing emergency measures (for example, energizing another solenoid valve to cut off the sample water flowing to the oxygen content detection module).

[0065] Further, in some embodiments where the temperature detection module includes a dual upper limit electric contact thermometer, the dual upper limit thermometer includes two temperature sensors.

[0066] It can be understood that when the sample water temperature is ≥Tmax, the corresponding solenoid valve or valve core is controlled to perform a predetermined action, thereby cutting off the sampling circuit and opening the bypass circuit, and directly discharging the sample water originally introduced into the sampling circuit through the bypass circuit.

[0067] When the sample water temperature is less than Tmax, the corresponding solenoid valve or valve core is controlled to perform a predetermined action, thereby opening the sampling circuit and cutting off the bypass circuit, so that the sample water flows along the sampling circuit again.

[0068] like Figure 1 and Figure 2 As shown, in some embodiments of the nuclear power oxygen automatic sampling and detection device, a sampling branch and a bypass branch are arranged in parallel after the temperature detection module, the oxygen content detection module is arranged on the sampling branch, a normally open sampling solenoid valve is arranged on the sampling branch, and a normally closed bypass solenoid valve is arranged on the bypass branch;

[0069] When the sample water temperature value is greater than or equal to the preset maximum sample water temperature value, the normally open sampling solenoid valve is closed to cut off the sample water flowing into the oxygen content detection module, and the normally closed bypass solenoid valve is opened to discharge the sample water;

[0070] When the sample water temperature is lower than the preset maximum sample water temperature, the normally open sampling solenoid valve remains open and the normally closed bypass solenoid valve remains closed, so that the sample water is completely introduced into the oxygen content detection module and then discharged.

[0071] It can be understood that an oxygen content detection module is installed on the sampling branch to measure the oxygen content in the sample water. When the sample water temperature is too high, the sample water is directly discharged through the bypass branch to avoid entering the oxygen content detection module, thereby preventing the over-temperature sample water from damaging the oxygen content detection module. The normally open sampling solenoid valve is open by default under normal working conditions and is closed only when the sample water temperature exceeds Tmax. The normally closed bypass solenoid valve is closed by default under normal working conditions and is opened only when the sample water temperature exceeds Tmax.

[0072] It should be noted that the temperature detection module confirms that the sample water temperature is lower than Tmax. The valve on the sampling branch is opened, and the sample water flows to the oxygen content detection module. The valve on the bypass branch is closed to prevent the sample water from passing through the bypass path. After the sample water passes through the oxygen content detection module, its oxygen content is measured and finally discharged from the system.

[0073] The temperature detection module detects that the sample water temperature reaches or exceeds Tmax. The valve on the sampling branch is closed to cut off the sample water flowing to the oxygen content detection module. The valve on the bypass branch is opened, and the overheated sample water is directly discharged through the bypass path. At this time, the oxygen content detection module does not participate in the work, thus avoiding the possible damage to the sensitive components caused by high temperature.

[0074] like Figure 1 and Figure 2 As shown, in some embodiments of the nuclear power oxygen automatic sampling and detection device, the oxygen content detection module includes an oxygen meter, a polarographic oxygen meter, a fluorescence oxygen meter, an optical oxygen meter or a conductivity oxygen meter.

[0075] It can be understood that oxygen meters, polarographic oxygen meters, fluorescence oxygen meters, optical oxygen meters or conductivity oxygen meters can all be used to measure the oxygen concentration in liquids. The specific type of oxygen content detection module is selected based on measurement accuracy, response speed, cost budget, application scenario limitations, etc.

[0076] like Figure 1 and Figure 2 As shown, in some embodiments of the nuclear power oxygen automatic sampling and detection device, if the sample water temperature value is greater than or equal to the preset maximum sample water temperature value, the sample water flowing into the oxygen content detection module is cut off, and after the sample water flows out of the temperature detection module, it is discharged to the conventional island waste liquid collection system of the nuclear power plant;

[0077] If the sample water temperature is lower than the preset maximum sample water temperature, the sample water will be completely introduced into the oxygen content detection module after flowing out of the temperature detection module and then discharged from the conventional island waste liquid collection system of the nuclear power plant.

[0078] It can be understood that when the sample water temperature exceeds Tmax, the bypass branch guides the sample water to the conventional island waste liquid collection system of the nuclear power plant. The conventional island waste liquid collection system of the nuclear power plant is a system dedicated to collecting waste liquid in the nuclear power plant, which can safely collect and treat liquid that does not meet the requirements to prevent the liquid from polluting the environment.

[0079] Of course, when the sample water temperature is lower than Tmax, the sample water flowing out through the oxygen content detection module will also be discharged into the conventional island waste liquid collection system of the nuclear power plant.

[0080] like Figure 1 and Figure 2 As shown, in some embodiments of the nuclear power oxygen automatic sampling and detection device, before introducing the sample water into the temperature detection module, the process further includes: cooling the sample water and then introducing it into the temperature detection module.

[0081] It is understood that after the sample water flows out from the sampling point, it first passes through a pre-cooling device. This device can be a heat exchanger, a cooling tower or other appropriate cooling equipment, the purpose of which is to reduce the temperature of the sample water to a safe range. The cooling medium can be cold water, refrigerant or other suitable cooling medium, which can be selected according to actual needs.

[0082] like Figure 1 and Figure 2 As shown, in some embodiments of the nuclear power oxygen automatic sampling and detection device, as Figure 1 and Figure 2 As shown, in some embodiments of the nuclear power oxygen automatic sampling and detection device, cooling the sample water includes:

[0083] The cooling water of the conventional island closed-circuit cooling water system of the nuclear power plant is obtained; it can be understood that the closed-circuit cooling water system usually has a stable low-temperature characteristic and is suitable for cooling the sample water.

[0084] The sample water and cooling water are introduced into the heat exchanger respectively, so that the sample water is heat exchanged by the cooling water. It can be understood that the heat exchanger is a common heat exchange device in the prior art, which allows two fluids to transfer heat without direct contact. Common types of heat exchangers include shell and tube heat exchangers, plate heat exchangers, etc.

[0085] The sample water flows through one channel of the heat exchanger. The cooling water flows through the other channel of the heat exchanger. In the heat exchanger, heat transfer occurs between the high-temperature sample water and the low-temperature cooling water, and the sample water is cooled by the cooling water.

[0086] Figure 2 A nuclear power oxygen sampling and detection system 10 in some embodiments of the present invention is shown, which includes:

[0087] The sampling pipeline group 1 is connected to the pipeline 40 between the deaerator 20 and the inlet of the recirculation pump 30;

[0088] The sampling detection device 2 includes a temperature detection module 21 and an oxygen content detection module 22. The temperature detection module 21 and the oxygen content detection module 22 are arranged one by one on the sampling pipeline group 1 along the flow direction of the sample water. The temperature detection module 21 is used to detect the temperature of the sample water to obtain the sample water temperature value, and the oxygen content detection module 22 is used to detect the oxygen content of the sample water to obtain the sample water oxygen content value; and

[0089] The control device 3 is used to read the sample water temperature value in real time, and control the sample water flowing out of the temperature detection module 21 to be introduced into the oxygen content detection module 22 or directly discharged according to the sample water temperature value.

[0090] It can be understood that the sampling pipeline group 1 is led out from the pipeline between the deaerator and the recirculation pump inlet for transmitting sample water. The sampling detection device 2 includes a temperature detection module 21 and an oxygen content detection module 22, which are arranged one by one on the sampling pipeline group 1 along the flow direction of the sample water.

[0091] The temperature detection module 21 is used to monitor the temperature of the sample water in real time to obtain the sample water temperature value. The oxygen content detection module 22 is used to detect the dissolved oxygen content in the sample water in real time to obtain the sample water oxygen content value. The control device 3 is used to read the sample water temperature value in real time and control the sample water flow direction according to the sample water temperature value.

[0092] like Figure 1 and Figure 2 As shown, in the nuclear power oxygen sampling and detection system 10, the sampling pipeline group 1 includes a main pipeline 11 and a sampling branch 12. One end of the main pipeline 11 is connected to the pipeline between the deaerator and the inlet of the recirculation pump, and the other end of the main pipeline 11 is connected to one end of the temperature detection module 21. The sampling branch 12 is connected to the other end of the temperature detection module 21, and the oxygen content detection module 22 is arranged on the sampling branch 12.

[0093] It can be understood that one end of the main pipeline 11 is directly drawn from the pipeline between the deaerator and the recirculation pump inlet to obtain the sample water. The main pipeline 11 should be made of high temperature resistant and corrosion resistant materials, such as stainless steel or other suitable alloy materials. A stop valve or a check valve can be configured on the main pipeline 11 to facilitate the control of the flow and maintenance of the sample water.

[0094] like Figure 1 and Figure 2 As shown, in the nuclear power oxygen sampling and detection system 10 , the sampling pipeline group 1 further includes a bypass branch 13 , and the bypass branch 13 is connected in parallel to the temperature detection module 21 .

[0095] It can be understood that both the bypass branch 13 and the sampling branch 12 can provide sample water for flow, wherein, when the sample water temperature exceeds the preset maximum sample water temperature value, the bypass branch 13 is opened and the sampling branch 12 is closed, so that the sample water cannot continue to flow along the sampling branch 12, but flows out through the bypass branch 13 to prevent the high-temperature sample water from damaging the oxygen content detection module 22.

[0096] like Figure 1 and Figure 2 As shown, in the nuclear power oxygen sampling and detection system 10, the control device 3 includes a normally open sampling solenoid valve 31 and a normally closed bypass solenoid valve 32. The normally open sampling solenoid valve 31 is arranged on the sampling branch 12, and the normally closed bypass solenoid valve 32 is arranged on the bypass branch 13.

[0097] When the sample water temperature value is greater than or equal to the preset maximum sample water temperature value, the normally open sampling solenoid valve 31 closes to cut off the sampling branch 12, and the normally closed bypass solenoid valve 32 opens to open the bypass branch 13;

[0098] When the sample water temperature value is less than the preset maximum sample water temperature value, the normally open sampling solenoid valve 31 opens to open the sampling branch 12, and the normally closed bypass solenoid valve 32 closes to cut off the bypass branch 13.

[0099] Understandably, the normally open sampling solenoid valve 31 is arranged on the sampling branch 12 and remains open under normal circumstances, allowing the sample water to flow towards the oxygen content detection module 22. The normally closed bypass solenoid valve 32 is arranged on the bypass branch 13 and remains closed under normal circumstances, preventing the sample water from passing through the bypass branch 13.

[0100] In this way, when the sample water temperature value < Tmax, the sample water flows towards the oxygen content detection module 22, and the oxygen meter detects the dissolved oxygen content in the sample water in real time and records the data.

[0101] When the sample water temperature value ≥ Tmax, the oxygen content detection module 22 does not participate in the work to avoid damage to the sensitive components caused by high temperature.

[0102] As Figure 1 and Figure 2 shown, in the nuclear power oxygen measurement sampling detection system 10, the control device 3 further includes a controller, and the controller is electrically connected to the normally open sampling solenoid valve 31, the normally closed bypass solenoid valve 32 and the temperature detection module 21.

[0103] Understandably, the controller is used to read the sample water temperature value provided by the temperature detection module 21 in real time, compare the sample water temperature value with the preset maximum sample water temperature value Tmax, and accordingly determine the actions of each valve, so as to send control signals to the normally open sampling solenoid valve 31 and the normally closed bypass solenoid valve 32 to achieve the control of the flow direction of the sample water.

[0104] In some other embodiments, if the temperature detection module 21 is configured as a double upper limit electric contact thermometer, the on-off control of the sampling solenoid valve and the normally closed bypass solenoid valve 32 can be directly realized through the double upper limit electric contact thermometer. Especially, the sampling solenoid valve is a normally open valve and closes when powered on; while the bypass solenoid valve is a normally closed valve and opens when powered on. In this way, when the temperature reaches the preset maximum temperature, the current will be transmitted to the two solenoid valves simultaneously through the double upper limit electric contact thermometer, thereby realizing the on-off control of the two solenoid valves and also realizing the open and cut-off control of the two branches.

[0105] As Figure 1 and Figure 2As shown, in the nuclear power oxygen measurement sampling and detection system 10, the nuclear power oxygen measurement sampling and detection system 10 also includes a cooler 4, and the cooler 4 is arranged on the sampling pipeline group 1, and the cooler 4 is used to cool the sample water.

[0106] It can be understood that the cooler 4 is arranged on the main pipeline 11, before the sample water drawn from between the deaerator and the recirculation pump inlet enters the temperature detection module 21. The cooler 4 is a prior art, which can be a cooler 4 of air cooling, liquid cooling or other cooling forms.

[0107] like Figure 1 and Figure 2 As shown, in the nuclear power oxygen sampling and detection system 10, the cooler 4 includes a heat exchanger, which is arranged on the sampling pipe group 1, the first circuit of the heat exchanger is connected to the sampling pipe group 1, and the second circuit of the heat exchanger is connected to the conventional island closed-loop cooling water system of the nuclear power plant.

[0108] It can be understood that the sample water and cooling water are respectively introduced into different channels (first loop and second loop) of the heat exchanger to achieve heat transfer and reduce the sample water temperature. The conventional island closed-loop cooling water system of a nuclear power plant refers to a system dedicated to providing cooling water in a nuclear power plant. Of course, other systems or devices capable of providing cooling water in the prior art may also be used.

[0109] like Figure 1 and Figure 2 As shown, in the nuclear power oxygen measurement sampling and detection system 10, the nuclear power oxygen measurement sampling and detection system 10 also includes a sampling valve 5, and the sampling valve 5 and the temperature detection module 21 are arranged one by one on the sampling pipeline group 1 along the flow direction of the sample water.

[0110] It can be understood that the sampling valve 5 is used to control the flow of sample water in the sampling pipeline group 1. When the sampling valve 5 is in the cut-off state, the sample water will stop flowing to the temperature detection module 21; when the sampling valve 5 is in the open state, the sample water can flow normally along the sampling pipeline group 1.

[0111] like Figure 1 and Figure 2 As shown, in the nuclear power oxygen sampling and detection system 10 , the oxygen content detection module 22 includes an oxygen meter, which is arranged on the sampling pipeline group 1 .

[0112] It is understandable that an oxygen meter is an instrument specially designed to measure the concentration of dissolved oxygen in water. For example, the oxygen meter can be a polarographic oxygen meter, a fluorescence oxygen meter, an optical oxygen meter or a conductivity oxygen meter.

[0113] In addition to the above, it should be noted that Tmax referred to in the present invention refers to the preset maximum sample water temperature value.

[0114] The implementation of the present invention has the following beneficial effects:

[0115] The present invention relates to an automatic sampling and detection device and system for measuring oxygen in nuclear power plants, and in particular, to achieve real-time online monitoring of the oxygen content and water temperature of the secondary circuit water quality during the first auxiliary steam deoxygenation of the deaerator and the hot flushing stage of the secondary circuit. Through the coordinated work of the temperature detection module and the oxygen content detection module, the temperature value and oxygen content value of the sample water can be obtained in time, thereby ensuring that the water quality meets the operation requirements.

[0116] When the sample water temperature exceeds the preset maximum temperature value, the system can automatically cut off the sample water flowing into the oxygen content detection module and directly discharge the high-temperature sample water to avoid damage caused by the device or mechanism used to measure the oxygen content of the high-temperature sample water. This automatic control not only improves the safety of the system, but also reduces the need for manual intervention.

[0117] Furthermore, the present invention can not only detect the oxygen content of the sample water in real time through the oxygen content detection module, but also detect the temperature of the sample water in real time through the temperature detection module, thereby providing continuous and real-time sample water oxygen content values ​​and sample water temperature values ​​to the user; further, when the pressure water supply temperature is too high, the sample water flowing to the oxygen content detection module will be cut off, thereby preventing the oxygen content detection module from being damaged due to the excessively high sample water temperature, thereby improving the durability of the product.

[0118] The scheme of the present invention has been described in detail above with reference to the accompanying drawings. In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments. Those skilled in the art should also be aware that the actions and modules involved in the specification are not necessarily required for the present invention. In addition, it can be understood that the steps in the method of the embodiment of the present invention can be adjusted in order, merged and deleted according to actual needs, and the modules in the device of the embodiment of the present invention can be merged, divided and deleted according to actual needs.

[0119] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A nuclear power oxygen measurement automatic sampling and detection device, characterized in that: include: Obtain sample water from the pipe between the deaerator and the recirculation pump inlet; The sample water is introduced into the temperature detection module and the oxygen content detection module successively, the temperature value of the sample water is obtained through the temperature detection module, and the oxygen content value of the sample water is obtained through the oxygen content detection module; If the sample water temperature value is greater than or equal to the preset maximum sample water temperature value, the sample water is directly discharged after passing through the temperature detection module to avoid the sample water passing through the oxygen content detection module; If the sample water temperature value is lower than the preset maximum sample water temperature value, the sample water is completely introduced into the oxygen content detection module after flowing out of the temperature detection module and then discharged.

2. The nuclear power oxygen automatic sampling and detection device according to claim 1 is characterized in that: The temperature detection module comprises a double upper limit electric contact thermometer, and the double upper limit electric contact thermometer is used to monitor the sample water temperature in real time to obtain the sample water temperature value.

3. The nuclear power oxygen automatic sampling and detection device according to claim 1 is characterized in that: A sampling branch and a bypass branch are arranged in parallel behind the temperature detection module, the oxygen content detection module is arranged on the sampling branch, a normally open sampling solenoid valve is arranged on the sampling branch, and a normally closed bypass solenoid valve is arranged on the bypass branch; When the sample water temperature value is greater than or equal to the preset maximum sample water temperature value, the normally open sampling solenoid valve is closed to cut off the sample water flowing into the oxygen content detection module, and the normally closed bypass solenoid valve is opened to discharge the sample water; When the sample water temperature value is less than the preset maximum sample water temperature value, the normally open sampling solenoid valve remains in an open state, and the normally closed bypass solenoid valve remains in a closed state, so that the sample water is completely introduced into the oxygen content detection module and then discharged.

4. The nuclear power oxygen measurement automatic sampling and detection device according to any one of claims 1 to 3, characterized in that: The oxygen content detection module includes an oxygen meter, a polarographic oxygen meter, a fluorescence oxygen meter, an optical oxygen meter or a conductivity oxygen meter.

5. The nuclear power oxygen measurement automatic sampling and detection device according to any one of claims 1 to 3, characterized in that: If the sample water temperature value is greater than or equal to the preset maximum sample water temperature value, the sample water flowing into the oxygen content detection module is cut off, and the sample water is discharged to the conventional island waste liquid collection system of the nuclear power plant after it flows out of the temperature detection module; If the sample water temperature value is less than the preset maximum sample water temperature value, the sample water is completely introduced into the oxygen content detection module after flowing out of the temperature detection module and then discharged from the conventional island waste liquid collection system of the nuclear power plant.

6. The nuclear power oxygen automatic sampling and detection device according to claim 1 is characterized in that: Before the sample water is introduced into the temperature detection module, the following steps are also included: The sample water is cooled and then introduced into the temperature detection module.

7. The nuclear power oxygen automatic sampling and detection device according to claim 6 is characterized in that: The cooling of the sample water comprises: Obtain cooling water from the closed-circuit cooling water system of the conventional island of a nuclear power plant; The sample water and the cooling water are introduced into the heat exchanger respectively, so that the sample water is heat exchanged by the cooling water.

8. A nuclear power oxygen sampling and detection system, characterized in that: include: A sampling pipeline group connected to the pipeline between the deaerator and the recirculation pump inlet; A sampling detection device, comprising a temperature detection module and an oxygen content detection module, wherein the temperature detection module and the oxygen content detection module are arranged one by one on the sampling pipeline group along the flow direction of the sample water, the temperature detection module is used to detect the temperature of the sample water to obtain the sample water temperature value, and the oxygen content detection module is used to detect the oxygen content of the sample water to obtain the sample water oxygen content value; and The control device is used to read the sample water temperature value in real time, and control the sample water flowing out of the temperature detection module to be introduced into the oxygen content detection module or directly discharged according to the sample water temperature value.

9. The nuclear power oxygen sampling and detection system according to claim 8, characterized in that: The sampling pipeline group includes a main pipeline and a sampling branch. One end of the main pipeline is connected to the pipeline between the deaerator and the inlet of the recirculation pump, and the other end of the main pipeline is connected to one end of the temperature detection module. The sampling branch is connected to the other end of the temperature detection module, and the oxygen content detection module is arranged on the sampling branch.

10. The nuclear power oxygen sampling and detection system according to claim 9, characterized in that: The sampling pipeline group also includes a bypass branch, and the bypass branch is connected in parallel to the temperature detection module.

11. The nuclear power oxygen sampling and detection system according to claim 10, characterized in that: The control device comprises a normally open sampling solenoid valve and a normally closed bypass solenoid valve, wherein the normally open sampling solenoid valve is arranged on the sampling branch, and the normally closed bypass solenoid valve is arranged on the bypass branch; When the sample water temperature value is greater than or equal to the preset maximum sample water temperature value, the normally open sampling solenoid valve is closed to cut off the sampling branch, and the normally closed bypass solenoid valve is opened to open the bypass branch; When the sample water temperature value is less than the preset maximum sample water temperature value, the normally open sampling solenoid valve is opened to open the sampling branch, and the normally closed bypass solenoid valve is closed to cut off the bypass branch.

12. The nuclear power oxygen sampling and detection system according to claim 11, characterized in that: The control device further comprises a controller, which is electrically connected to the normally open sampling solenoid valve, the normally closed bypass solenoid valve and the temperature detection module.

13. The nuclear power oxygen sampling and detection system according to claim 8, characterized in that: The nuclear power oxygen sampling and detection system also includes a cooler, which is arranged on the sampling pipeline group and is used to cool the sample water.

14. The nuclear power oxygen sampling and detection system according to claim 13, characterized in that: The cooler comprises a heat exchanger, which is arranged on the sampling pipe group, wherein a first circuit of the heat exchanger is connected to the sampling pipe group, and a second circuit of the heat exchanger is connected to a conventional island closed-circuit cooling water system of a nuclear power plant.

15. The nuclear power oxygen sampling and detection system according to claim 8, characterized in that: The nuclear power oxygen sampling and detection system also includes a sampling valve, and the sampling valve and the temperature detection module are arranged one by one on the sampling pipeline group along the flow direction of the sample water.

16. The nuclear power oxygen sampling and detection system according to claim 8, characterized in that: The oxygen content detection module includes an oxygen meter, and the oxygen meter is arranged on the sampling pipeline group.

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