Automatic monitoring system for steam generator blowdown water

Abstract

The utility model relates to a kind of steam generator blowdown water automatic monitoring system, comprising: sampling preparation unit, including the heat exchanger, first filter device and pressure reducing valve connected in turn, the input end of heat exchanger is connected with the blowdown water sample pipeline of steam generator;Chromatograph, chromatograph input end is connected with pressure reducing valve output end;Measuring unit, including second filter device, on-line PH analyzer and on-line conductivity analyzer, second filter device input end is connected with pressure reducing valve output end, on-line PH analyzer and on-line conductivity analyzer input end are respectively connected with the output end of second filter device connection.This application is by sampling preparation unit, chromatograph and measuring unit cooperation, after the blowdown water sample of steam generator is input chromatograph and measuring unit after temperature reduction pressure reduction processing, the concentration of specific ion in sample and sewage PH and conductivity are detected, detection data are all transmitted to control system, realize the automatic on-line monitoring of steam generator blowdown water.

Description

Technical Field

[0001] This utility model relates to the field of monitoring technology for steam generator wastewater in nuclear power plants, and is used to monitor the normal operation of steam generators, specifically to an automatic monitoring system for steam generator wastewater. Background Technology

[0002] During the operation of a nuclear power plant, the steam generator, as a key device connecting the primary and secondary loops of the nuclear reactor, undertakes the important functions of heat transfer and radioactive isolation. Its operational safety is directly related to the overall safety and stability of the nuclear power plant.

[0003] When a radioactive medium leaks from a steam generator, some ions (such as Cl-) will appear in the steam generator's wastewater. - Na + NH4 + Since the concentration of pollutants (such as steam generator exhaust) changes, the normal operation of the steam generator can be monitored by monitoring the exhaust wastewater. Therefore, the purpose of this application is to provide an automatic monitoring system for steam generator exhaust wastewater. Utility Model Content

[0004] Based on the above description, this utility model provides an automatic monitoring system for steam generator wastewater to achieve online automatic monitoring of steam generator wastewater.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: This application provides an automatic monitoring system for steam generator wastewater, and the technical solution adopted is as follows: An automatic monitoring system for steam generator wastewater includes: The sampling preparation unit includes a heat exchanger, a first filter device, and a pressure reducing valve connected in sequence. The input end of the heat exchanger is connected to the wastewater sample pipeline of the steam generator. A chromatograph, wherein the input end of the chromatograph is connected to the output end of the pressure reducing valve; The measuring unit includes a second filter device, an online pH analyzer, and an online conductivity analyzer. The input end of the second filter device is connected to the output end of the pressure reducing valve, and the input ends of the online pH analyzer and the online conductivity analyzer are respectively connected to the output end of the second filter device.

[0006] Preferably, a self-regulating temperature control valve is installed on the cooling water inlet pipe of the heat exchanger, and the temperature sensing element of the self-regulating temperature control valve is located in the wastewater outlet pipe of the heat exchanger.

[0007] Preferably, the first filtration device includes two filters arranged in parallel, the two filters sharing a differential pressure sensor, and valves for controlling the on / off state are provided on both the inlet and outlet pipes of the filters.

[0008] Preferably, the measuring unit further includes an ion exchange column, the input end of which is connected to the output end of the second filtration device, and the output end of which is connected to the input end of the online conductivity analyzer. The ion exchange column is used to remove some metal cations and ammonia ions from the wastewater sample.

[0009] Preferably, it also includes a manual sampling container connected to the output of the pressure reducing valve for manual sampling.

[0010] Preferably, a pressure gauge, a thermometer, and a flow meter are installed on the output pipeline of the pressure reducing valve.

[0011] Preferably, there are at least two sampling preparation units and one-to-one corresponding measurement units, and the output end of the pressure reducing valve in each sampling preparation unit is connected to the chromatograph.

[0012] Compared with the prior art, the technical solution of this application has at least the following beneficial technical effects: 1. The automatic monitoring system for steam generator wastewater of this application, through a sampling preparation unit, a chromatograph, and a measurement unit, sequentially passes the wastewater sample output from the steam generator's wastewater sample pipeline through the heat exchanger, the first filter device, and the pressure reducing valve of the sampling preparation unit to cool, filter, and reduce the pressure of the wastewater sample, making it directly usable for subsequent detection by the testing equipment. The wastewater sample after cooling and pressure reduction is input into the chromatograph and the measurement unit, respectively. The wastewater sample undergoes chromatographic analysis in the chromatograph to determine the Cl content in the sample. - Na + SO4 2- The concentration of plasma. Wastewater samples undergo secondary filtration in the measurement unit to further remove insoluble impurities. The samples are then input into an online pH analyzer and an online conductivity analyzer to detect their pH and conductivity. All data is transmitted to the control system, thereby enabling automatic online monitoring of the steam generator's wastewater and, consequently, monitoring of nuclear leaks in the steam generator. Attached Figure Description

[0013] Figure 1 A schematic diagram of the structure of the automatic monitoring system for steam generator wastewater provided in this embodiment of the utility model; Figure 2 A schematic diagram of the sampling preparation unit in the automatic monitoring system for steam generator wastewater provided in this embodiment of the utility model; Figure 3A schematic diagram of the measurement module in the automatic monitoring system for steam generator wastewater provided in this embodiment of the utility model.

[0014] Explanation of reference numerals in the attached figures: 1. Sampling preparation unit; 11. Heat exchanger; 12. First filter device; 13. Pressure reducing valve; 14. Self-regulating temperature control valve; 15. Solenoid valve; 16. Drain pipe; 17. Pressure relief pipeline; 18. Pressure relief valve; 2. Chromatograph; 3. Measurement module; 31. Measurement unit; 311. Second filter device; 312. Online pH analyzer; 313. Online conductivity analyzer; 314. Ion exchange column; 4. Manual sampling container; 5. Sample pipeline; 6. Filter; 7. Differential pressure sensor; 8. Pressure gauge; 9. Thermometer; 10. Flow meter; 20. Discharge system. Detailed Implementation

[0015] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0016] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0017] It is understood that spatial relation terms such as "below," "under," "below," "below," "above," "above," etc., can be used here to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, the element or feature described as "below" or "below" of the other element or feature will be oriented "above" the other element or feature. Therefore, the exemplary terms "below" and "below" can include both upper and lower orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein will be interpreted accordingly.

[0018] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediary element. In the following embodiments, "connection" should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have the transmission of electrical signals or data between them.

[0019] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” or “having,” etc., specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0020] Reference Figure 1 As shown in the figure, this application provides an automatic monitoring system for steam generator wastewater, including a sampling preparation unit 1, a chromatograph 2, a measurement unit 31, and a manual sampling container 4.

[0021] Reference Figure 2 As shown, the sampling preparation unit 1 includes a heat exchanger 11, a first filter device 12 and a pressure reducing valve 13 connected in sequence. The input end of the heat exchanger 11 is connected to the wastewater sample pipeline 5 of the steam generator.

[0022] Reference Figure 2 As shown, specifically, the wastewater discharge pipe of the steam generator is connected to the sample pipe 5, and a ball valve is installed on the sample pipe 5 to control the on / off state. The input end of the heat exchanger 11 is connected to the output end of the sample pipe 5. The wastewater sample output from the sample pipe 5 is input into the heat exchanger 11 and cooled down by the heat exchanger 11.

[0023] Reference Figure 2As shown, a self-regulating temperature control valve 14 is installed on the cooling water inlet pipe of heat exchanger 11. The temperature sensing element of the self-regulating temperature control valve 14 is located in the wastewater sample outlet pipe of heat exchanger 11. The temperature sensing element of the self-regulating temperature control valve 14 continuously measures the temperature of the wastewater sample after cooling by heat exchanger 11 and feeds it back to the valve body. The valve automatically changes its opening to adjust the cooling water supply until the temperature of the cooled sample stabilizes at the set value, thus achieving a constant wastewater outlet temperature from the heat exchanger. Traditional control methods using a regulating valve and a temperature sensor require the acquisition of temperature sensor data, followed by PID control of the regulating valve through a PLC control system. This method demands high control accuracy from the regulating valve, is complex, and has high economic and maintenance costs. In contrast, this embodiment uses a self-regulating temperature control valve 14, which eliminates the need for additional temperature sensors, PLC control systems, and external power sources. It senses changes in the medium temperature through its built-in temperature sensing element and controls the valve opening to achieve constant temperature control.

[0024] Reference Figure 2 As shown, a solenoid valve 15 is installed on the wastewater inlet pipe of heat exchanger 11 to control its on / off state. In addition to connecting to the cooling water circulation system, the cooling water outlet of heat exchanger 11 is also connected to the discharge system 20 via a drain pipe 16, which is equipped with a ball valve for on / off control. The portion of the wastewater inlet pipe of heat exchanger 11 before the solenoid valve 15 is also connected to the discharge system 20 via the drain pipe 16, which is equipped with a needle valve for on / off control. The drain pipe 16 allows wastewater and cooling water to be transported to the discharge system 20 for discharge according to actual conditions.

[0025] Reference Figure 2 As shown, the first filtration device 12 is connected to the wastewater output pipeline of the heat exchanger 11. Specifically, it includes two filters 6 connected in parallel, and the two filters 6 share a single differential pressure sensor 7. Each filter 6 has valves controlling its on / off state on both its inlet and outlet pipelines. Specifically, the inlet pipelines of the two heat exchangers 11 and the inlet pipeline of the differential pressure sensor 7 are connected in parallel to a main inlet pipeline, and their outlet pipelines are connected in parallel to a main outlet pipeline. This main inlet pipeline is connected to the output pipeline of the heat exchanger 11. Furthermore, needle valves are installed on both the inlet and outlet pipelines of the differential pressure sensor 7 to control its on / off state.

[0026] The first filtration device 12 consists of two parallel filters 6 and a differential pressure sensor 7. One filter 6 is in use and the other is on standby. The filter 6 filters out some insoluble impurities in the sewage sample. The differential pressure sensor 7 monitors the pressure difference between the inlet and outlet of the filter 6 in use and feeds the detection data back to the control system. When the filter element of the filter 6 is clogged, an alarm is issued to remind personnel to switch to the standby filter 6 and clean or replace the clogged filter 6 to ensure uninterrupted delivery of sewage samples.

[0027] ReferenceFigure 2 As shown, the outlet of the first filter device 12 is connected to the inlet of the pressure reducing valve 13, and the pressure of the sewage is reduced after passing through the pressure reducing valve 13. The output pipeline of the pressure reducing valve 13 is connected to the discharge system 20 through a pressure relief pipeline, and a pressure relief valve 18 is installed on the pressure relief pipeline 17 as a safety measure to prevent the system from being damaged by overpressure.

[0028] Reference Figure 2 As shown, a pressure gauge 8, a thermometer 9, and a flow meter 10 are also installed on the output pipeline of the pressure reducing valve 13. The detection data from the pressure gauge 8, thermometer 9, and flow meter 10 are fed back to the control system. The control system controls the opening and closing of the solenoid valve 15 on the sewage inlet pipeline of the heat exchanger 11 based on the data. When the pressure, temperature, and flow rate exceed the set values, the solenoid valve 15 can be closed to stop the sampling, and an alarm will be issued through the alarm device. Among them, a needle valve is installed on the input pipeline of the pressure gauge 8 as the root valve of the pressure gauge 8, which is used for online inspection, maintenance, and replacement of the pressure gauge 8.

[0029] Reference Figure 2 As shown, the output pipeline of the pressure reducing valve 13 is divided into four branches at the end. The four branches are respectively connected to the chromatograph 2, the measuring unit 31, the manual sampling container 4 and the emission system 20, and ball valves are installed on the four branches to control the on and off.

[0030] Therefore, the high-pressure, high-temperature wastewater output from the steam generator's wastewater discharge pipe is cooled and depressurized by the sampling preparation unit 1 before being output for testing.

[0031] Chromatograph 2 is used to detect Cl in wastewater samples. - Na + SO4 2- The plasma concentration is used to detect the concentration of specific ions in the wastewater from the steam generator, and the detection data is fed back to the control system. The system is equipped with an ultrapure water system to supply ultrapure water to the chromatograph 2. The drain pipe of the chromatograph 2 is connected to the discharge system 20.

[0032] Reference Figure 3 As shown, the measuring unit 31 includes a second filter device 311, an online pH analyzer 312, and an online conductivity analyzer 313. The input end of the second filter device 311 is connected to the output end of the pressure reducing valve 13, and the input ends of the online pH analyzer 312 and the online conductivity analyzer 313 are respectively connected to the output end of the second filter device 311.

[0033] Reference Figure 3As shown, the second filtration device 311 has the same structure as the first filtration device 12, both consisting of two parallel filters 6 and a shared differential pressure sensor 7. The difference is that the pore size of the filter 6 in the first filtration device 12 is larger than that of the filter 6 in the second filtration device 311. The second filtration device 311 can further filter impurities in wastewater samples entering the online pH analyzer 312 and the online conductivity analyzer 313, improving the accuracy of the detection results.

[0034] Reference Figure 3 As shown, specifically, the inlet pipe of the second filter device 311 is connected to a branch at the end of the output pipe of the pressure reducing valve 13. A ball valve for controlling the on / off state is installed on the inlet pipe of the second filter device 311 to control the sample injection into the measuring unit 31. Furthermore, a pressure gauge 8 and a thermometer 9 are installed on the inlet pipe of the second filter device 311 to detect the pressure and temperature of the wastewater sample entering the measuring unit 31.

[0035] Reference Figure 3 As shown, the outlet pipe of the second filtration device 311 is divided into two branches, which are respectively connected to the online pH analyzer 312 and the online conductivity analyzer 313. Each branch is equipped with a needle valve and a flow meter 10 to control and monitor the sample flow rate input to the online pH analyzer 312 and the online conductivity analyzer 313.

[0036] Reference Figure 3 As shown, the measuring unit 31 also includes an ion exchange column 314. The input end of the ion exchange column 314 is connected to the output end of the second filtration device 311, and the output end of the ion exchange column 314 is connected to the input end of the online conductivity analyzer 313. The ion exchange column 314 is used to remove some metal cations and ammonia ions from the wastewater sample. Specifically, the ion exchange column 314 is connected to the branch connected to the online conductivity analyzer 313.

[0037] Online pH analyzer 312 and online conductivity analyzer 313 enable online monitoring of the pH and conductivity of wastewater samples, with data fed back to the control system. The output pipes of both analyzers 312 and 313 are connected to the discharge system 20, which transports the tested wastewater for discharge. This achieves automatic monitoring of the pH and conductivity of the steam generator's effluent.

[0038] By combining the sampling preparation unit 1, the chromatograph 2, and the measurement unit 31, automatic monitoring of the wastewater discharged from the steam generator can be achieved.

[0039] The manual sampling container 4 is used for manual sampling. Specifically, the manual sampling container 4 can be a sampling tank or other container depending on the actual situation. Manual sampling is performed by controlling the opening and closing of the valves on the four branches of the output pipeline of the pressure reducing valve 13 that are connected to the sampling tank. The output pipeline of the sampling tank is connected to the discharge system 20 to transport excess samples to the discharge system 20 for discharge.

[0040] Furthermore, at least two sampling preparation units 1 and one-to-one measurement units 31 are provided respectively, and the output end of the pressure reducing valve 13 in each sampling preparation unit 1 is connected to the chromatograph 2.

[0041] Specifically, the sampling preparation unit 1 is configured according to the number of wastewater sample pipelines 5 from the steam generator. Each sample pipeline 5 corresponds to one sampling preparation unit 1, and each sampling preparation unit 1 corresponds to one measurement unit 31. All sampling preparation units 1 share one chromatograph 2 and one manual sampling container 4. The sampling preparation unit 1 and the corresponding measurement unit 31 work together to monitor the pH and conductivity of the wastewater sample output from the corresponding sample pipeline 5. During manual sampling, the valve on the output branch of the sampling preparation unit 1 connected to the corresponding sample pipeline 5 is opened as needed to take a sample.

[0042] In this embodiment, the steam generator is illustrated with four wastewater sample pipelines 5. The corresponding sampling preparation unit 1 is provided with four units, and the measurement unit 31 is provided with four units. Specifically, the measurement unit 31 is divided into two groups, each group including two measurement units 31. The two measurement units 31 in each group form a measurement module 3.

[0043] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An automatic monitoring system for wastewater discharge from a steam generator, characterized in that, include: The sampling preparation unit (1) includes a heat exchanger (11), a first filter device (12) and a pressure reducing valve (13) connected in sequence. The input end of the heat exchanger (11) is connected to the wastewater sample pipeline (5) of the steam generator. Chromatograph (2), wherein the input end of the chromatograph (2) is connected to the output end of the pressure reducing valve (13); The measuring unit (31) includes a second filter device (311), an online pH analyzer (312), and an online conductivity analyzer (313). The input end of the second filter device (311) is connected to the output end of the pressure reducing valve (13), and the input ends of the online pH analyzer (312) and the online conductivity analyzer (313) are respectively connected to the output end of the second filter device (311).

2. The automatic monitoring system for steam generator wastewater according to claim 1, characterized in that: A self-regulating temperature control valve (14) is installed on the cooling water inlet pipe of the heat exchanger (11), and the temperature sensing element of the self-regulating temperature control valve (14) is located in the sewage outlet pipe of the heat exchanger (11).

3. The automatic monitoring system for steam generator wastewater according to claim 1, characterized in that: The first filtration device (12) includes two filters (6) arranged in parallel. The two filters (6) share a differential pressure sensor (7). The inlet and outlet pipes of the filters (6) are equipped with valves to control the on / off state.

4. The automatic monitoring system for steam generator wastewater according to claim 1, characterized in that: The measurement unit (31) further includes an ion exchange column (314), the input end of which is connected to the output end of the second filter device (311), and the output end of which is connected to the input end of the online conductivity analyzer (313). The ion exchange column (314) is used to remove some metal cations and ammonia ions from the wastewater sample.

5. The automatic monitoring system for steam generator wastewater according to claim 1, characterized in that: It also includes a manual sampling container (4), which is connected to the output of the pressure reducing valve (13) for manual sampling.

6. The automatic monitoring system for steam generator wastewater according to claim 1, characterized in that: A pressure gauge (8), a thermometer (9), and a flow meter (10) are installed on the output pipeline of the pressure reducing valve (13).

7. The automatic monitoring system for steam generator wastewater according to claim 1, characterized in that: The sampling preparation unit (1) and the measurement unit (31) are provided in at least two and correspond one to one. The output end of the pressure reducing valve (13) in each sampling preparation unit (1) is connected to the chromatograph (2).

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