Hydrazine concentration detection device

Abstract

The utility model provides a hydrazine concentration detection device and relates to the field of hydrazine concentration detection. The detection device is used for detecting the hydrazine concentration of wastewater in a wastewater tank, the hydrazine concentration detection device comprises a first metering pump, a concentration detector, a dilution device, a dilution power unit and a controller, and a water pumping port of the first metering pump is communicated with the wastewater tank; a first water inlet, a second water inlet and a first water outlet are formed in the concentration detector, and the first water inlet is communicated with a water outlet of the first metering pump; the diluting device comprises a diluting tank, a third water inlet and a second water outlet are formed in the diluting tank, the third water inlet is communicated with the first water outlet, and the second water outlet is communicated with the second water inlet; the controller is electrically connected with the first metering pump, the concentration detector, the diluting device and the diluting power unit respectively. The detection device provided by the utility model meets the detection of hydrazine wastewater with various concentrations.

Description

Technical Field

[0001] This utility model relates to the field of hydrazine concentration detection technology, and specifically to a hydrazine concentration detection device. Background Technology

[0002] Most nuclear power plants in China use hydrazine as a corrosion inhibitor, pH adjuster, and steam generator (SG) maintenance fluid in the secondary loop. Therefore, equipment flushing during commissioning, use of maintenance fluids during system shutdowns, and the evacuation and leakage of hydrazine-containing systems during normal operation can all potentially result in hydrazine discharge into wastewater. In recent years, with increasingly stringent controls on hydrazine emissions, real-time monitoring of hydrazine concentrations in nuclear power plant wastewater is necessary to ensure compliance with relevant standards. Typically, hydrazine levels in wastewater fluctuate significantly, and existing detection devices cannot meet the need to detect both low-concentration and high-concentration hydrazine wastewater. Utility Model Content

[0003] In view of the problems existing in the prior art, the present invention provides a hydrazine concentration detection device to improve the problem that the existing detection devices cannot detect both low-concentration and high-concentration hydrazine wastewater.

[0004] To achieve the above and other related objectives, this utility model provides a hydrazine concentration detection device for detecting the hydrazine concentration in wastewater in a wastewater tank. The hydrazine concentration detection device includes a first metering pump, a concentration detector, a dilution device, a dilution power unit, and a controller. The inlet of the first metering pump is connected to the wastewater tank. The concentration detector is provided with a first inlet, a second inlet, and a first outlet. The first inlet is connected to the outlet of the first metering pump. The dilution device includes a dilution tank, which is provided with a third inlet and a second outlet. The third inlet is connected to the first outlet, and the second outlet is connected to the second inlet. The controller is electrically connected to the first metering pump, the concentration detector, the dilution device, and the dilution power unit.

[0005] In one embodiment of the present invention, the detection device further includes a cooling device for cooling the wastewater to be tested, the cooling device being disposed between the first metering pump and the concentration detector.

[0006] In one embodiment of the present invention, the detection device further includes a filtration device, which is disposed between the first metering pump and the concentration detector. The inlet of the filtration device is connected to the outlet of the first metering pump, and the outlet of the filtration device is connected to the first inlet.

[0007] In one embodiment of this utility model, a potential detection device and a first three-way valve are provided between the first metering pump and the concentration detector. The inlet of the potential detection device is connected to the outlet of the first metering pump. A fourth inlet is provided on the dilution tank. The three ports of the first three-way valve are respectively connected to the outlet of the potential detection device, the first inlet, and the fourth inlet. The first three-way valve is a solenoid valve. The potential detection device and the first three-way valve are respectively electrically connected to the controller.

[0008] In one embodiment of the present invention, the dilution device further includes a first clear water tank and a second metering pump for supplying deionized water to the dilution tank. The dilution tank is connected to the first clear water tank through the second metering pump, and the second metering pump is electrically connected to the controller.

[0009] In one embodiment of the present invention, the dilution device further includes a stirring device, which extends into the dilution solution in the dilution tank.

[0010] In one embodiment of this utility model, the detection device further includes a cleaning device, which includes a second three-way valve, a third three-way valve, and a second clean water tank. The three ports of the second three-way valve are respectively connected to the outlet of the wastewater tank, the inlet of the first metering pump, and the outlet of the second clean water tank. The three ports of the third three-way valve are respectively connected to the outlet of the first metering pump, the first inlet, and the wastewater tank.

[0011] In one embodiment of this utility model, both the second three-way valve and the third three-way valve are solenoid valves, and the second three-way valve and the third three-way valve are electrically connected to the controller.

[0012] In one embodiment of this utility model, the concentration detector is further provided with a third water outlet, and the dilution tank is further provided with a fourth water outlet, the third water outlet and the fourth water outlet being respectively connected to the wastewater tank.

[0013] In one embodiment of this utility model, the controller is installed inside an electrical control cabinet, and the controller is electrically connected to the electrical control cabinet.

[0014] This utility model discloses a hydrazine concentration detection device. The concentration detector is connected to a dilution device. If the hydrazine concentration in the wastewater exceeds the detection range of the concentration detector, it is diluted using the dilution device and then detected again until the hydrazine concentration falls within the measurement range of the concentration detector. Therefore, the detection device of this application can meet the requirements for detecting both low-concentration and high-concentration hydrazine wastewater. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the hydrazine concentration detection device of this utility model in one embodiment.

[0017] Component designation explanation

[0018] 10. Wastewater tank; 100. First metering pump; 110. First three-way valve; 200. Concentration detector; 210. First inlet; 220. Second inlet; 230. First outlet; 240. Third outlet; 300. Dilution device; 310. Dilution tank; 311. Third inlet; 312. Second outlet; 313. Fourth inlet; 314. Fourth outlet; 320. First clear water tank; 330. Second metering pump; 400. Dilution power unit; 500. Cooling device; 600. Filter device; 700. Potential detection device; 800. Cleaning device; 810. Second three-way valve; 820. Third three-way valve; 830. Second clear water tank. Detailed Implementation

[0019] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. It should also be understood that the terminology used in the embodiments of this utility model is for describing specific implementation schemes and not for limiting the scope of protection of this utility model. Test methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions or according to the conditions recommended by the respective manufacturers.

[0020] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise specified in this invention, both endpoints of each numerical range and any value between the two endpoints may be selected. Unless otherwise defined, all technical and scientific terms used in this invention, as well as the prior art known to those skilled in the art and the description of this invention, may be implemented using any prior art methods, equipment, and materials similar to or equivalent to those in the embodiments of this invention.

[0021] It should be noted that the terms such as "upper", "lower", "left", "right", "middle" and "one" used in this specification are only for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered as within the scope of implementation of this utility model.

[0022] When using a hydrazine concentration detection device to detect the concentration of hydrazine in wastewater, the accuracy is low when detecting wastewater with low hydrazine concentration if the detection range is too large, and low when detecting wastewater with high hydrazine concentration if the detection range is too small. Therefore, existing detection devices cannot meet the requirement of detecting both low-concentration and high-concentration hydrazine wastewater. Therefore, this application provides a hydrazine concentration detection device that can be used for detecting both high-concentration and low-concentration hydrazine wastewater.

[0023] Please see Figure 1 The hydrazine concentration detection device of this application is used to detect the hydrazine concentration in wastewater in wastewater tank 10. The device includes a first metering pump 100, a concentration detector 200, a dilution device 300, a dilution power unit 400, and a controller (not shown in the figure). The dilution device 300 includes a dilution tank 310, which is connected to the concentration detector 200. The controller is electrically connected to the first metering pump 100, the concentration detector 200, the dilution device 300, and the dilution power unit 400. The detection device of this application, equipped with the dilution device 300, can dilute wastewater with excessively high hydrazine concentrations before concentration detection by the concentration detector 200, thus enabling the detection of both low-concentration and high-concentration hydrazine wastewater.

[0024] Please see Figure 1In one embodiment, the inlet of the first metering pump 100 is connected to the wastewater tank 10. The type of the first metering pump 100 is not limited; for example, it can be a plunger pump, diaphragm pump, gear pump, etc., as long as it can quantitatively extract the wastewater to be tested. The concentration detector 200 is provided with a first inlet 210, a second inlet 220, and a first outlet 230. The first inlet 210 is connected to the outlet of the first metering pump 100. The measurement range of the concentration detector 200 is not limited and can be adjusted according to actual needs. For example, the detection range of the concentration detector 200 is 0–200 ppb. The dilution tank 310 is provided with a third inlet 311 and a second outlet 312. The third inlet 311 is connected to the first outlet 230, and the second outlet 312 is connected to the second inlet 220. The dilution power unit 400 is used to transport wastewater from the concentration detector 200 to the dilution tank 310, and to transport the diluted wastewater from the dilution tank 310 to the concentration detector 200. The type of dilution power unit 400 is not limited here, as long as it can transport the wastewater from the concentration detector 200 to the dilution tank 310 for dilution, and then transport the diluted wastewater from the dilution tank 310 to the concentration detector 200 for further testing. When testing the wastewater in wastewater tank 10, the first metering pump 100 draws a certain amount of wastewater from the wastewater tank 10 and transports it through pipeline to the concentration detector 200 for testing. If the hydrazine concentration in the wastewater exceeds the detection range of the concentration detector 200, the controller controls the dilution power unit 400 to transport the wastewater in the concentration detector 200 to the dilution tank 310 for dilution. After dilution to a preset ratio, the controller controls the dilution power unit 400 to transport the diluted wastewater in the dilution tank 310 to the concentration detector 200 for testing until the hydrazine concentration in the wastewater is within the detection range of the concentration detector 200. The dilution ratio of the wastewater is not limited here and can be adjusted according to actual needs. Furthermore, the actual hydrazine concentration in the wastewater can be obtained based on the detection results of the concentration detector 200 and the dilution ratio. In this embodiment, the control principles of the controller for the first metering pump 100, the concentration detector 200, the dilution device 300, and the dilution power unit 400 can all refer to existing technologies and will not be elaborated here.

[0025] Please see Figure 1In one embodiment, the dilution power unit 400 can be a power device installed inside the concentration detector 200, or a power device installed on the pipeline between the concentration detector 200 and the dilution tank 310. In this embodiment, the dilution power unit 400 includes two metering pumps, each electrically connected to a controller. One metering pump is installed on the pipeline between the first outlet 230 and the third inlet 311, controlling the flow of wastewater from the first outlet 230 to the third inlet 311; the other metering pump is installed between the second inlet 220 and the second outlet 312, controlling the flow of wastewater from the second outlet 312 to the second inlet 220. When diluting the wastewater detected by the concentration detector 200, the controller controls the metering pump between the first outlet 230 and the third inlet 311 to start, and delivers the wastewater to the dilution tank 310 for dilution. After dilution is completed, the controller controls the metering pump between the second inlet 220 and the second outlet 312 to start, and delivers the wastewater to the concentration detector 200 for detection.

[0026] Please see Figure 1 In one embodiment, the detection device further includes a cooling device 500 for cooling the wastewater to be tested, which is disposed between the first metering pump 100 and the concentration detector 200. The type and arrangement of the cooling device 500 are not limited here; for example, the cooling device 500 can be disposed on the pipeline between the first metering pump 100 and the concentration detector 200, or it can be wrapped around the pipeline. In this embodiment, the cooling device 500 is wrapped around the pipeline. For example, the cooling device 500 contains cooling water, and the pipeline is submerged in the cooling water. Cooling of the wastewater in the pipeline is achieved through heat exchange with the cooling water. In this embodiment, the detection device also includes a filtration device 600, which is disposed between the first metering pump 100 and the concentration detector 200. The inlet of the filtration device 600 is connected to the outlet of the first metering pump 100, and the outlet of the filtration device 600 is connected to the first inlet 210. The type of filter device 600 is not limited here, as long as it can filter wastewater. For example, activated carbon is installed in the filter device 600 as a filter medium to reduce the interference of impurities in the wastewater on the test results and improve the accuracy of the test.

[0027] Please see Figure 1In one embodiment, to improve detection efficiency, a potential detection device 700 and a first three-way valve 110 are provided between the first metering pump 100 and the concentration detector 200. The inlet of the potential detection device 700 is connected to the outlet of the first metering pump 100. A fourth inlet 313 is provided on the dilution tank 310. The three ports of the first three-way valve 110 are respectively connected to the outlet of the potential detection device 700, the first inlet 210, and the fourth inlet 313. In this embodiment, the first three-way valve 110 is a solenoid valve, and the potential detection device 700 and the first three-way valve 110 are electrically connected to the controller. The potential detection device 700 performs a preliminary detection of the hydrazine concentration in the wastewater. Based on the detection results from the potential detection device 700, the controller controls the opening direction of the first three-way valve 110. If dilution is not required, the controller directs the first three-way valve 110 to deliver the wastewater to the concentration detector 200 for testing. If dilution is required, the controller dilutes the wastewater according to the detection results from the potential detection device 700 and a preset dilution ratio before testing it again with the concentration detector 200. If the hydrazine concentration still exceeds the detection range of the concentration detector 200, the wastewater is diluted again and tested until the hydrazine concentration falls within the detection range of the concentration detector 200. The dilution ratio can be adjusted according to actual needs. It should be noted that this control method is similar to conventional methods in the prior art, and will not be elaborated further. Using the potential detection device 700 to perform preliminary detection of hydrazine concentration allows for initial dilution by a larger factor when the hydrazine concentration in the wastewater is too high. Then, based on the detection results from the concentration detector 200, a smaller dilution factor is applied. This avoids excessive dilution cycles due to excessively small dilution factors when the hydrazine concentration is too high, significantly improving detection efficiency. In this embodiment, the control principle of the controller for the potential detection device 700 and the first three-way valve 110 can refer to existing technology and will not be elaborated here.

[0028] Please see Figure 1In one embodiment, the dilution device 300 further includes a first clear water tank 320 and a second metering pump 330 for supplying deionized water to the dilution tank 310. The inlet of the second metering pump 330 is connected to the first clear water tank 320, and the outlet of the second metering pump 330 is connected to the dilution tank 310. The second metering pump 330 is electrically connected to a controller. When diluting wastewater, the controller controls the second metering pump 330 to supply a corresponding amount of deionized water from the first clear water tank 320 to the dilution tank 310 to achieve the dilution of the wastewater. Furthermore, in order to improve the uniformity of hydrazine distribution in the diluted solution, the dilution device 300 also includes a stirring device that extends into the diluted solution in the dilution tank 310. In this embodiment, the concentration detector 200 is also provided with a third outlet 240, and the dilution tank 310 is also provided with a fourth outlet 314. The third outlet 240 and the fourth outlet 314 are respectively connected to the wastewater tank 10. In other embodiments, the third outlet 240 and the fourth outlet 314 can also be connected to the waste liquid discharge system and adjusted according to actual needs. In this embodiment, the control principle of the controller for the second metering pump 330 can refer to the prior art, and will not be described in detail here.

[0029] Please see Figure 1In one embodiment, since the detection device of this application can detect both low-concentration and high-concentration hydrazine wastewater, in order to reduce the impact of residual high-concentration hydrazine wastewater in the pipeline on subsequent measurements, the detection device further includes a cleaning device 800. The cleaning device 800 includes a second three-way valve 810, a third three-way valve 820, and a second clean water tank 830. The three ports of the second three-way valve 810 are respectively connected to the outlet of the wastewater tank 10, the inlet of the first metering pump 100, and the outlet of the second clean water tank 830. The three ports of the third three-way valve 820 are respectively connected to the drain outlet of the first metering pump 100, the first inlet 210, and the wastewater tank 10. The second three-way valve 810 is installed close to the outlet of the wastewater tank 10, and the third three-way valve 820 is installed close to the first three-way valve 110, to better clean the residual wastewater in the pipeline. In this embodiment, both the second three-way valve 810 and the third three-way valve 820 are solenoid valves, and are electrically connected to the controller. When the concentration detector 200 performs concentration detection, the controller controls the first three-way valve 110 to close, and the cleaning device 800 cleans the pipeline between the wastewater tank 10 and the first three-way valve 110. Specifically, the controller controls the second three-way valve 810 to connect the second clean water tank 830 to the first metering pump 100, and the deionized water in the second clean water tank 830 flows sequentially through the pipeline, passing through the second three-way valve 810, the first metering pump 100, the cooling device 500, the filter device 600, and the potential detection device 700, before flowing into the wastewater tank 10 through the third three-way valve 820. The number of times the pipeline is cleaned is not limited and can be adjusted according to actual conditions. In other embodiments, to simplify the detection device, the first clean water tank 320 can also be connected to the first metering pump 100 via the second three-way valve 810. In this embodiment, the controller's control of the second three-way valve 810 and the third three-way valve 820 can refer to the prior art, and will not be described in detail here.

[0030] Please see Figure 1 In one embodiment, the controller is installed inside an electrical control cabinet and is electrically connected to the cabinet. The electrical control cabinet is equipped with a human-machine interface, which can be used to display the hydrazine concentration measured by the concentration detector 200, relevant parameters of the first metering pump 100 and the second metering pump 330, and can also be used to set relevant parameters such as the first metering pump 100, the second metering pump 330, and the dilution factor.

[0031] This utility model discloses a hydrazine concentration detection device. The concentration detector is connected to a dilution device. If the hydrazine concentration in the wastewater exceeds the detection range of the concentration detector, it is diluted using the dilution device and then detected again until the hydrazine concentration is within the measurement range of the concentration detector. Therefore, the detection device of this application can meet the requirements for detecting both low-concentration and high-concentration hydrazine wastewater. Thus, this utility model effectively overcomes some practical problems in the prior art, and therefore has high utilization value and practical significance.

[0032] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A hydrazine concentration detection device for detecting the hydrazine concentration in wastewater in a wastewater tank (10), characterized in that, The detection device includes: The first metering pump (100) has its pump outlet connected to the wastewater tank (10); A concentration detector (200) is provided with a first inlet (210), a second inlet (220) and a first outlet (230), wherein the first inlet (210) is connected to the drain outlet of the first metering pump (100); The dilution device (300) includes a dilution tank (310), which is provided with a third inlet (311) and a second outlet (312). The third inlet (311) is connected to the first outlet (230), and the second outlet (312) is connected to the second inlet (220). A dilution power unit (400) is used to transport wastewater in the concentration detector (200) to the dilution tank (310), and to transport diluted wastewater in the dilution tank (310) to the concentration detector (200); The controller is electrically connected to the first metering pump (100), the concentration detector (200), the dilution device (300), and the dilution power unit (400), respectively.

2. The hydrazine concentration detection device according to claim 1, characterized in that, The detection device also includes a cooling device (500) for cooling the wastewater to be tested, the cooling device (500) being disposed between the first metering pump (100) and the concentration detector (200).

3. The hydrazine concentration detection device according to claim 1, characterized in that, The detection device further includes a filter device (600), which is disposed between the first metering pump (100) and the concentration detector (200). The inlet of the filter device (600) is connected to the outlet of the first metering pump (100), and the outlet of the filter device (600) is connected to the first inlet (210).

4. The hydrazine concentration detection device according to claim 1, characterized in that, A potential detection device (700) and a first three-way valve (110) are provided between the first metering pump (100) and the concentration detector (200). The inlet of the potential detection device (700) is connected to the outlet of the first metering pump (100). A fourth inlet (313) is provided on the dilution tank (310). The three ports of the first three-way valve (110) are respectively connected to the outlet of the potential detection device (700), the first inlet (210) and the fourth inlet (313). The first three-way valve (110) is a solenoid valve. The potential detection device (700) and the first three-way valve (110) are respectively electrically connected to the controller.

5. The hydrazine concentration detection device according to claim 1, characterized in that, The dilution device (300) further includes a first clear water tank (320) and a second metering pump (330) for supplying deionized water to the dilution tank (310). The dilution tank (310) is connected to the first clear water tank (320) through the second metering pump (330), and the second metering pump (330) is electrically connected to the controller.

6. The hydrazine concentration detection device according to claim 1, characterized in that, The dilution device (300) also includes a stirring device that extends into the dilution solution in the dilution tank (310).

7. The hydrazine concentration detection device according to claim 1, characterized in that, The detection device also includes a cleaning device (800), which includes a second three-way valve (810), a third three-way valve (820), and a second clean water tank (830). The three ports of the second three-way valve (810) are respectively connected to the outlet of the wastewater tank (10), the inlet of the first metering pump (100), and the outlet of the second clean water tank (830). The three ports of the third three-way valve (820) are respectively connected to the outlet of the first metering pump (100), the first inlet (210), and the wastewater tank (10).

8. The hydrazine concentration detection device according to claim 7, characterized in that, Both the second three-way valve (810) and the third three-way valve (820) are solenoid valves, and the second three-way valve (810) and the third three-way valve (820) are electrically connected to the controller.

9. The hydrazine concentration detection device according to claim 1, characterized in that, The concentration detector (200) is also provided with a third outlet (240), and the dilution tank (310) is also provided with a fourth outlet (314). The third outlet (240) and the fourth outlet (314) are respectively connected to the wastewater tank (10).

10. The hydrazine concentration detection device according to claim 1, characterized in that, The controller is installed inside the electrical control cabinet and is electrically connected to the electrical control cabinet.

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