Measuring device for measuring conductivity of degassed hydrogen

Abstract

The utility model provides a measuring device for measuring the conductivity of degassing hydrogen. The measuring device comprises a first switching valve, a second switching valve, a first exchange column, a second exchange column, a degassing membrane assembly and a conductivity meter, the output end of the first switching valve is respectively connected with the first exchange column and the second exchange column; the input end of the second switching valve is respectively connected with the first exchange column and the second exchange column; the receiving end of the conductivity meter is connected with the input end of the degassing membrane assembly and the output end of the degassing membrane assembly respectively; when the degassing hydrogen conductivity test is carried out on the sample water source, one of the first exchange column and the second exchange column is conducted, and the degassing membrane assembly filters out foreign gas in the sample water source. According to the degassing hydrogen conductivity measuring device, the first exchange column and the second exchange column which can be switched are alternately used to stably measure the degassing hydrogen conductivity of the sample water source in the overhaul process, and impurity gas dissolved in the sample water source is separated under the action of the degassing membrane component, so that the accuracy of the degassing hydrogen conductivity measurement is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of power plant water quality monitoring, especially relates to a measuring device for measuring degassing hydrogen conductivity. BACKGROUND

[0002] In power plants, the monitoring of water quality plays a vital role in ensuring the safe operation of the unit. Hydrogen conductivity is one of the important indicators reflecting the impurity content in water. However, there are some problems affecting the accuracy of hydrogen conductivity measurement. On the one hand, the dissolved gas in water (such as carbon dioxide) and water sample flow will make the measured value of hydrogen conductivity larger, causing the sample water quality data to be unqualified. To solve this problem, it is necessary to ensure the stability of water sample flow and remove CO2 in the sample water. Only by measuring the degassing hydrogen conductivity can the influence of impurities in the sample water be truly reflected. Currently, the existing degassing method usually uses heating method, which has complex structure and high operation risk, and is not suitable for online long-term measurement. On the other hand, the commonly used cation exchange column in power plants is fixed by bolts, which is difficult to disassemble. After replacing the resin, the cleaning time is too long, resulting in long-term distortion of the measured value of hydrogen conductivity. SUMMARY

[0003] In order to solve the problem of inaccurate measurement value in the existing degassing hydrogen conductivity measurement process described in the background art, the utility model provides the following technical scheme:

[0004] A measuring device for measuring degassing hydrogen conductivity, comprising: a first switching valve, a second switching valve, a first exchange column, a second exchange column, a degassing membrane assembly and a conductivity meter; the input end of the first switching valve is connected with a sample water source, the output end of the first switching valve is connected with the first exchange column and the second exchange column respectively; the input end of the second switching valve is connected with the first exchange column and the second exchange column respectively, and the output end of the second switching valve is output outward after passing through the degassing membrane assembly; the receiving end of the conductivity meter is connected with the input end of the degassing membrane assembly and the output end of the degassing membrane assembly respectively; when the degassing hydrogen conductivity of the sample water source is tested, one of the first exchange column and the second exchange column is turned on, and the degassing membrane assembly filters out the impurity gas in the sample water source.

[0005] Among them, the fiber membrane is fixed in the degassing membrane assembly; the fiber membrane divides the cavity in the degassing membrane assembly into an inner ring and an outer ring, when the sample water source flows through the fiber membrane, the impurity gas in the sample water source passes through the inner ring into the outer ring, and the sample water source flows outward along the inner ring.

[0006] Further, the first exchange column and the second exchange column are both filled with cation resin.

[0007] Further, a steady flow valve and a flow meter are arranged between the first switch valve and the sample water source, and the flow meter is located between the steady flow valve and the first switch valve.

[0008] Further, the water sample flow rate flowing into the first switch valve is 150 mL / min - 300 mL / min.

[0009] Further, the measuring device further comprises a vacuum pump connected with the exhaust port of the degassing membrane assembly to discharge the impurity gas in the sample water source.

[0010] Beneficial effects: the first exchange column and the second exchange column are alternately used to stabilize the measurement of the degassing hydrogen conductivity of the sample water source during the maintenance process, and the impurity gas dissolved in the sample water source is separated under the action of the degassing membrane assembly, thereby improving the accuracy of the degassing hydrogen conductivity measurement. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is a structural schematic view of a measuring device for measuring degassing hydrogen conductivity according to an embodiment of the utility model. DETAILED DESCRIPTION

[0012] In order to make the purpose, technical scheme and advantages of the present application more clear, the utility model will be described in further detail below with reference to the drawings. It should be understood that the specific embodiments described herein are only used to explain the utility model, and are not used to limit the utility model.

[0013] It should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the patent and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the patent.

[0014] Figure 1 It is a structural schematic view of a measuring device for measuring degassing hydrogen conductivity according to an embodiment of the utility model.

[0015] REFERENCE Figure 1The utility model discloses a measuring device for measuring degassing hydrogen conductivity, which comprises a first switching valve 1, a second switching valve 2, a first exchange column 3, a second exchange column 4, a degassing membrane assembly 5 and a conductivity meter 6. The input end of the first switching valve 1 is connected to a sample water source 7, and the output end of the first switching valve 1 is connected to the first exchange column 3 and the second exchange column 4 respectively. The input end of the second switching valve 2 is connected to the first exchange column 3 and the second exchange column 4 respectively, and the output end of the second switching valve 2 is connected to the degassing membrane assembly 5. The receiving end of the conductivity meter 6 is connected to the input end of the degassing membrane assembly 5 and the output end of the degassing membrane assembly 5 respectively. When the degassing hydrogen conductivity of the sample water source 7 is tested, one of the first exchange column 3 and the second exchange column 4 is turned on, and the degassing membrane assembly 5 filters out the impurity gas in the sample water source 7.

[0016] The first exchange column 3 and the second exchange column 4 are both used to remove cations contained in the sample water source, and both are filled with cation resin. During the conductivity test, the first switching valve 1 and the second switching valve 2 work together to ensure that one of the first exchange column 3 and the second exchange column 4 is turned on, and one of the first exchange column 3 and the second exchange column 4 serves as a standby channel for subsequent maintenance. Further, in order to quickly identify the service life of the cation resin, the cation resin in this embodiment adopts a color-changing style, and the housings of the first exchange column 3 and the second exchange column 4 are both made of transparent glass.

[0017] Specifically, the degassing membrane assembly 5 is provided with a gas cavity for transmitting the sample water source 7 and storing impurity gas. The gas cavity is provided with a hollow fiber membrane 51 to divide the entire gas cavity into an inner ring and an outer ring. The gas molecules dissolved in the sample water source 7 can escape from the inner ring to the outer ring through the limiting membrane, and the water molecules are blocked by the fiber membrane 51 and flow out of the pipeline. Further, the gas impurities are quickly discharged, and in this embodiment, the measuring device further comprises a vacuum pump 10. The vacuum pump 10 is connected to the exhaust port of the degassing membrane assembly 5, so that the separated impurity gas in the degassing membrane assembly 5 is quickly discharged during the degassing hydrogen conductivity treatment, so as to avoid the interference of excessive accumulation of impurity gas on the measurement result.

[0018] Further, in order to stabilize the input of the sample water source, in the embodiment, a steady flow valve 8 and a flow meter 9 are further arranged between the first switching valve 1 and the sample water source, and the flow meter 9 is located between the steady flow valve 8 and the first switching valve 1. During the measurement of the degassing hydrogen conductivity of the sample water source, the steady flow valve 8 is adjusted so that the water sample flow rate flowing into the first switching valve 1 is 150 mL / min-300 mL / min, so as to stabilize the water sample input during the measurement process and avoid that the impurity gas cannot be completely filtered in the degassing membrane assembly 5 due to too fast flow rate. In addition, in order to avoid the influence of the maintenance process on the detection of the sample water source, in the embodiment, the first exchange column 3 and the second exchange column 4 are both provided with quick couplings. During the monitoring process, there is only one flow into the sample water source between the first exchange column 3 and the second exchange column 4, and the other one is used as a backup, so that the on-off channel is quickly changed by the first switching valve 1 and the second switching valve 2 during the maintenance process, thereby avoiding the influence of the replacement of the spent cation resin on the monitoring process.

[0019] In summary, the first exchange column and the second exchange column are alternately used by being arranged to be switchable, so as to stabilize the measurement of the degassing hydrogen conductivity of the sample water source during the maintenance process, and the impurity gas dissolved in the sample water source is separated under the action of the degassing membrane assembly, thereby improving the accuracy of the degassing hydrogen conductivity measurement.

[0020] The above describes specific embodiments of the utility model. Other embodiments are within the scope of the appended claims.

[0021] The terms "exemplary", "example", and the like are used as adjectives to mean "serving as an example, instance, or illustration", with no implication that any feature is "preferred" or "advantageous" over other examples or embodiments. In this detailed description, specific embodiments of techniques have been described for purposes of explanation. However, various modifications can be made without departing from the scope of the techniques. In some instances, well-known structures and devices are shown in block diagram form, rather than in detail, in order to avoid obscuring the concepts of the described embodiments.

[0022] The above describes the optional implementation of the embodiments of the utility model in detail in combination with the drawings, but the embodiments of the utility model are not limited to the specific details in the above implementation, and various simple modifications can be made to the technical scheme of the embodiments of the utility model within the technical concept scope of the embodiments of the utility model, and these simple modifications all belong to the protection scope of the embodiments of the utility model.

[0023] The above description of the present disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other variations without departing from the scope of the disclosure. Thus, the present disclosure is not intended to be limited to the examples described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A measuring device for measuring the conductivity of degassed hydrogen, characterized in that include: A first switching valve (1), a second switching valve (2), a first exchange column (3), a second exchange column (4), a degassing membrane assembly (5) and a conductivity meter (6); the input end of the first switching valve (1) is connected to the sample water source (7), and the output end of the first switching valve (1) is respectively connected to the first exchange column (3) and the second exchange column (4); the input end of the second switching valve (2) is respectively connected to the first exchange column (3) and the second exchange column (4), and the output end of the second switching valve (2) is output to the outside after passing through the degassing membrane assembly (5); the receiving end of the conductivity meter (6) is respectively connected to the input end of the degassing membrane assembly (5) and the output end of the degassing membrane assembly (5); when the degassed hydrogen conductivity test is performed on the sample water source (7), one of the first exchange column (3) and the second exchange column (4) is connected, and the degassing membrane assembly (5) filters out the impurity gas in the sample water source (7).

2. The measuring device for measuring the conductivity of degassed hydrogen according to claim 1, characterized in that: A fiber membrane (51) is fixedly provided inside the degassing membrane assembly (5); the fiber membrane (51) divides the chamber inside the degassing membrane assembly (5) into an inner ring and an outer ring. When the sample water source (7) flows through the fiber membrane (51), the impurity gas in the sample water source (7) passes through the inner ring and enters the outer ring, and the sample water source (7) flows outward along the inner ring.

3. The measuring device for measuring the conductivity of degassed hydrogen according to claim 2, characterized in that: The first exchange column (3) and the second exchange column (4) are both filled with cationic resin.

4. The measuring device for measuring the conductivity of degassed hydrogen according to claim 1, characterized in that: A steady flow valve (8) and a flow meter (9) are further provided between the first switching valve (1) and the sample water source (7), and the flow meter (9) is located between the steady flow valve (8) and the first switching valve (1).

5. The measuring device for measuring the conductivity of degassed hydrogen according to claim 4, characterized in that: The flow rate of the water sample flowing into the first switching valve (1) is 150 mL / min-300 mL / min.

6. The measuring device for measuring the conductivity of degassed hydrogen according to claim 2, characterized in that: The measuring device further comprises a vacuum pump (10), which is connected to the exhaust port of the degassing membrane assembly (5) to discharge impurity gases in the sample water source (7).

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