Single membrane integrated electrically regenerated cation exchanger for hydrogen conductivity testing

Abstract

The present invention discloses a single-membrane integrated electrically regenerated cation exchanger for hydrogen conductivity testing. The frame, panel and back plates are combined into two cavities. In the cavity surrounded by the frame and back plates, a plate-shaped anode, a cation resin, a cation exchange membrane, a mesh cathode and a slotted metal plate are sequentially placed. The bottom and top of the resin are respectively provided with a lower water sample distribution piece and an upper water sample distribution piece. In the cavity surrounded by the frame and panel plates, a flow switch, an integrated circuit board and a display are placed. A cation exchange membrane is provided only between the cathode and the resin. The anode and the resin are in direct and close contact. The hydrogen ions generated on the anode can be directly used for the continuous regeneration of the cation resin. At the same time, the tiny oxygen bubbles generated on the anode can remove part of the carbon dioxide in the water sample through the stripping effect. Compared with other existing electrically regenerated cation exchangers, the device of the present invention has a simpler structure, lower production cost and higher hydrogen conductivity detection accuracy.

Description

Technical Field

[0001] The invention relates to an electric regeneration ion exchanger, in particular to a continuous electric regeneration cation exchanger for hydrogen conductivity testing. Background Art

[0002] Hydrogen conductivity is a key parameter in power plant chemical monitoring. It's typically measured after treating a water vapor sample with a cationic resin. It characterizes the amount of impure anions in the sample and is a key indicator of water vapor purity in a power plant. This indicator directly and sensitively reflects the total amount of impure anions in the boiler and water vapor system, helping chemists analyze and understand the current status of system corrosion, enabling them to take timely measures and ensure safe and economical system operation.

[0003] When using traditional cation exchange columns to process water samples, the cation resin needs to be frequently regenerated or replaced. This is not only cumbersome, but also when the resin is nearing failure, the exchange capacity decreases, and the detected hydrogen conductivity cannot accurately reflect the water quality.

[0004] To overcome the shortcomings of the aforementioned cation exchange columns, many power plants at home and abroad have adopted continuous electrically regenerated cation exchangers in recent years to process water samples for hydrogen conductivity testing. This device does not require frequent manual regeneration or replacement of the cation resin, making operation and management extremely simple. However, existing continuous electrically regenerated cation exchangers all have significant technical drawbacks. Typically, each device is equipped with two cation exchange membranes, has numerous compartments, a complex internal structure, and is cumbersome to assemble. Furthermore, the exchanger, along with its attached DC power supply and control system, requires a separate chassis for complete assembly, resulting in high production costs. Furthermore, existing electrically regenerated cation exchangers equipped with two cation exchange membranes lack the ability to remove carbon dioxide, making it impossible to mitigate the interference of carbon dioxide with hydrogen conductivity testing, thus affecting the accuracy of hydrogen conductivity detection. Summary of the Invention

[0005] In order to solve the problems involved in the background technology, the purpose of the present invention is to provide a continuous electrically regenerated cation exchanger with simple structure, low production cost and high test reliability, which is used to detect the hydrogen conductivity of power plant boiler feed water, boiler water and steam.

[0006] The technical solution adopted in the present invention is:

[0007] The present invention directly assembles a rectangular frame, a face plate and a back plate into an outer shell, and provides two cavities in the outer shell. No additional chassis is required when the outer shell is assembled as a whole. A plate-shaped anode, a cation resin, a cation exchange membrane, a mesh cathode and a slotted metal plate are sequentially arranged in the cavity surrounded by the frame and the back plate. The cation exchange membrane is provided only between the mesh cathode and the cation resin, while the anode and the cation resin are in direct and close contact. A lower water sample distribution member and an upper water sample distribution member are respectively arranged on the lower side and the upper side of the cation resin. A flow switch, an integrated circuit board and a display are placed in the cavity surrounded by the frame and the face plate, and the integrated circuit board and the display are electrically connected. The hydrogen ions generated on the anode are directly used for the continuous regeneration of the cation resin. At the same time, the oxygen bubbles generated on the anode can remove part of the carbon dioxide in the water sample through a stripping effect, thereby reducing the interference of carbon dioxide on hydrogen conductivity testing.

[0008] The frame plate is provided with a water sample inlet, a water sample outlet, an anode terminal, a cathode terminal, a lower water sample internal interface, an upper water sample internal interface and a cable inlet; a window is provided on the panel; and the back plate is provided with a polar water inlet and a polar water outlet for connecting to the slots in the slotted metal plate.

[0009] The mesh cathode is made of a corrosion-resistant metal mesh with a mesh size of 30-100.

[0010] The mesh cathode and the slotted metal plate maintain close contact and direct electrical connection.

[0011] The slotted metal plate is provided with a lower pole water uniform distribution groove, an upper pole water uniform distribution groove and multiple pole water grooves arranged from bottom to top on the side close to the mesh cathode; the lower pole water uniform distribution groove is respectively connected to the pole water inlet and the lower end of the pole water groove; the upper pole water uniform distribution groove is respectively connected to the pole water outlet and the upper end of the pole water groove; the pole water is evenly distributed through the slotted metal plate structure, which promotes the discharge of hydrogen bubbles generated on the cathode and evenly supports the mesh cathode to prevent its deformation.

[0012] The lower water sample evenly distributing member and the upper water sample evenly distributing member are both concave, and are provided with a plurality of slits with a width of 0.2-0.3 mm on the side facing the positive resin.

[0013] The lower water sample internal interface and the upper water sample internal interface are respectively connected to the inlet and outlet of the flow switch.

[0014] The water sample outlet is connected to the inlet of the hydrogen conductivity detector circulation cell through a pipeline, and the outlet of the hydrogen conductivity detector circulation cell is connected to the polar water inlet.

[0015] The integrated circuit board has functions such as current-adjustable DC output, measurement of electrolysis voltage and current, and automatic start and stop control based on the switching signal of the flow switch. It is also equipped with connection terminals such as AC input, DC output, switching signal input of the flow switch, and a communication interface corresponding to the display.

[0016] The anode is electrically connected to the positive terminal for outputting direct current in the integrated circuit board via the anode terminal; the slotted metal plate is electrically connected to the negative terminal for outputting direct current in the integrated circuit board via the cathode terminal.

[0017] The beneficial effects of the present invention are:

[0018] 1) Compared with conventional continuous electric regeneration cation exchange devices at home and abroad, the device of the present invention only sets a cation exchange membrane between the cation resin and the cathode, reducing the amount of cation exchange membrane by 50%. In addition, the device structure is greatly simplified and no additional chassis is required, which can significantly reduce the production cost of the device.

[0019] 2) The anode of the device of the present invention is in direct contact with the cationic resin. The tiny oxygen bubbles generated by the anode reaction can remove part of the carbon dioxide dissolved in the water sample through the stripping effect, reducing the interference of carbon dioxide on the hydrogen conductivity detection, which is beneficial to improving the detection accuracy of hydrogen conductivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the structure of the device of the present invention.

[0021] Figure 2 Schematic diagram of the structure of the slotted metal plate.

[0022] Figure 3 for Figure 2 AA cross-sectional view.

[0023] Figure 4 for Figure 2 BB cross-sectional view.

[0024] In the figure: 1, frame plate, 2, plate anode, 3, cationic resin, 4, cation exchange membrane, 5, mesh cathode, 6, slotted metal plate, 7, panel, 8, back plate, 9, lower water sample uniform distribution part, 10, upper water sample uniform distribution part, 11, window, 12, water sample inlet, 13, water sample outlet, 14, pole water inlet, 15, pole water outlet, 16, pole water tank, 17, sealing element, 18, anode terminal, 19, cathode terminal, 20, lower pole water uniform distribution tank, 21, upper pole water uniform distribution tank, 22, lower water sample internal interface, 23, upper water sample internal interface, 24, cable inlet, 25, flow switch, 26, integrated circuit board, 27, display. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] like Figure 1As shown, a rectangular parallelepiped frame plate 1, a panel plate 7 and a back plate 8, which are surrounded on all sides, open at the front and back and isolated in the middle, are directly assembled into an outer shell, and two cavities are provided in the outer shell. No separate chassis is required when the outer shell is assembled as a whole; a plate-shaped anode 2, a cationic resin 3, a cation exchange membrane 4, a mesh cathode 5 and a slotted metal plate 6 are arranged in sequence in the cavity surrounded by the frame plate 1 and the back plate 8, and a lower water sample evenly distributed member 9 and an upper water sample evenly distributed member 10 are arranged on the lower side and the upper side of the cationic resin 3 respectively; a flow switch 25, an integrated circuit board 26 and a display 27 are placed in the cavity surrounded by the frame plate 1 and the panel plate 7.

[0027] The present invention only provides a cation exchange membrane 4 between the cation resin 3 and the cathode 5, while the cation resin 3 and the anode 2 are not isolated by membrane materials. The anode 2 is in direct contact with the cation resin 3, and the hydrogen ions generated on the anode 2 are directly used for the continuous regeneration of the cation resin 3, so that the cation resin always exists in a hydrogen-dominated form, which can effectively remove cationic impurities in the water sample; at the same time, the tiny oxygen bubbles generated on the anode 2 can remove part of the carbon dioxide in the water sample through the stripping effect, reducing the interference of carbon dioxide on the hydrogen conductivity test, which is beneficial to improving the detection accuracy of the hydrogen conductivity.

[0028] The frame 1 is provided with a water sample inlet 12, a water sample outlet 13, an anode terminal 18, a cathode terminal 19, a lower water sample internal interface 22, an upper water sample internal interface 23 and a cable inlet 24; the panel 7 is provided with a transparent window 11 for observation; the back plate 8 is provided with a polar water inlet 14 and a polar water outlet 15 for communicating with the groove in the slotted metal plate 6.

[0029] The mesh cathode 5 is made of a corrosion-resistant metal mesh of 30-100 meshes, which can evenly support the cation exchange membrane 4 and prevent it from being deformed and damaged under the pressure of water flow.

[0030] like Figure 2-Figure 4 As shown, the slotted metal plate 6 is provided with a lower pole water uniform distribution groove 20, an upper pole water uniform distribution groove 21 and a plurality of pole water grooves 16 arranged from bottom to top on the side close to the mesh cathode 5; the upper pole water uniform distribution groove 21 and the lower pole water uniform distribution groove 20 are respectively located on the upper and lower sides of the pole water groove 16; the lower pole water uniform distribution groove 20 is respectively connected to the pole water inlet 14 and the lower end of the pole water groove 16; the upper pole water uniform distribution groove 21 is respectively connected to the pole water outlet 15 and the upper end of the pole water groove 16; the pole water is evenly distributed through the slotted metal plate 6 structure, which promotes the rapid discharge of hydrogen bubbles generated on the cathode and evenly supports the mesh cathode 5 to prevent its deformation.

[0031] The mesh cathode 5 and the slotted metal plate 6 maintain close contact and direct electrical connection.

[0032] The lower water sample evenly distributing member 9 and the upper water sample evenly distributing member 10 are both concave, both directly contact the cationic resin 3, and both have multiple gaps with a width of 0.2-0.3 mm on the side facing the cationic resin 3 for preventing the cationic resin 3 from leaking out.

[0033] The lower water sample internal interface 22 and the upper water sample internal interface 23 are connected to the inlet and outlet of the flow switch 25 respectively.

[0034] The water sample outlet 13 is connected to the inlet of the hydrogen conductivity detector circulation cell through a pipeline, and the outlet of the hydrogen conductivity detector circulation cell is connected to the polar water inlet 14.

[0035] The integrated circuit board 26 has functions such as a DC output with adjustable current, measurement of electrolysis voltage and current, and automatic start and stop control based on the switching signal of the flow switch 25. It is also provided with connection terminals such as AC input, DC output, switching signal input of the flow switch 25, and a communication interface corresponding to the display 27; the control system in the integrated circuit board will automatically start or stop the supply of DC power to the anode 2 and cathode 5 according to the switching signal provided by the flow switch 25.

[0036] The anode 2 is electrically connected to the positive terminal of the integrated circuit board 26 for outputting direct current via the anode terminal 18 ; the slotted metal plate 6 is electrically connected to the negative terminal of the integrated circuit board 26 for outputting direct current via the cathode terminal 19 .

[0037] A U-shaped sealing element 17 is provided between the frame plate 1 and the back plate 8, and other water-prone parts can be sealed with waterproof sealant to prevent water leakage of the device; the panel 7, frame plate 1 and back plate 8 can be fastened by bolts or other means.

[0038] When the device of the present invention is running, the water sample to be tested with a flow rate that meets the test requirements flows into the water sample inlet 12 and first flows through the flow switch 25, then evenly distributes the water through the lower water sample distribution member 9 and flows through the cationic resin 3 for treatment. 2+ Mg 2+ 、Na + , K + and NH4 + Cationic impurities are adsorbed by the cationic resin 3 through the ion exchange reaction, and utilize the selective permeability of the cation exchange membrane 4 to pass through the cation exchange membrane 4 by electromigration under the action of the DC electric field and enter the anode water tank 16, thereby effectively removing the cationic impurities in the water sample, while the anionic impurities in the water sample remain in the water; thereby, the anode 2 and the cathode 5 respectively undergo the following reactions:

[0039] 2H2O-4e=O2+4H + (Anode reaction)

[0040] 4H2O+4e=2H2+4OH - (Cathode reaction)

[0041] The H generated by the above anode reaction + The cation resin 3 can be continuously and effectively regenerated so that the cation resin 3 always exists in a form dominated by hydrogen, which can ensure the effective removal of cationic impurities in the water sample. In addition, since no membrane material is used to isolate the anode 2 and the cation resin 3, the tiny oxygen bubbles generated by the anode 2 can enter the water sample. Through the stripping effect of these tiny oxygen bubbles inside the device and in the external water sample delivery pipeline, part of the carbon dioxide dissolved in the water sample can be promoted to transfer from the liquid phase to the gas phase and removed from the water sample together, thereby reducing the interference of the dissolved carbon dioxide in the water sample on the hydrogen conductivity detection, which is beneficial to improving the detection accuracy of the hydrogen conductivity.

[0042] The treated water sample flows through the upper water sample uniform distribution part 10 and then flows out of the device from the water sample outlet 13, and is then transported to the hydrogen conductivity meter circulation pool for detection; the water sample after detection by the hydrogen conductivity detector then flows into the polar water inlet 14 as polar water, and after being evenly distributed through the lower polar water uniform distribution groove 20, flows through the polar water groove 16. During the flow, the polar water can carry away the cationic impurities that electromigrated to the polar water groove 16 and the hydrogen generated on the online cathode 5; the polar water then flows through the upper polar water uniform distribution groove 21 and is finally discharged from the polar water outlet 15.

[0043] The specific embodiments and test data of the present invention are as follows:

[0044] The laboratory used the device of the present invention, a double-membrane electrically regenerated cation exchanger, and a traditional cation exchange column to treat water samples. The water quality and water temperature of the water samples were exactly the same, and the treatment flow rate was controlled at 15-20 L / h. Before the test, the three hydrogen conductivity meters were calibrated, and the conductivity deviation of the three meters was less than 0.002 μs / cm. The comparison of the hydrogen conductivity data measured simultaneously when using the three devices is shown in Table 1.

[0045] Table 1 Comparison of hydrogen conductivity data measured simultaneously using three devices

[0046]

[0047]

[0048] As can be seen from Table 1, the hydrogen conductivity measured using the device of the present invention has a substantially consistent trend with that measured using a conventional cation exchange column. However, since the device of the present invention has the function of removing part of the dissolved carbon dioxide in the water sample, it can reduce the interference of carbon dioxide on the hydrogen conductivity detection. Therefore, the hydrogen conductivity value obtained is smaller and the test accuracy is higher.

Claims

1. A single-membrane integrated electrically regenerated cation exchanger for hydrogen conductivity testing, characterized by: The rectangular frame plate (1), the panel (7) and the back plate (8) are directly enclosed and assembled into an outer shell, and two cavities are provided in the outer shell. When the outer shell is assembled as a whole, no additional chassis is required. In the cavity enclosed by the frame plate (1) and the back plate (8), the plate-shaped anode (2), the cation resin (3), the cation exchange membrane (4), the mesh cathode (5) and the slotted metal plate (6) are arranged in sequence. The cation exchange membrane (4) is only provided between the mesh cathode (5) and the cation resin (3), while the anode (2) and the cation resin (3) are in direct and close contact. The cation resin ( 3) are respectively arranged on the lower and upper sides of the lower water sample uniform distribution member (9) and the upper water sample uniform distribution member (10); a flow switch (25), an integrated circuit board (26) and a display (27) are placed in the cavity surrounded by the frame plate (1) and the panel (7), and the integrated circuit board (26) and the display (27) are electrically connected; the hydrogen ions generated on the anode (2) are directly used for the continuous regeneration of the cation resin (3), and at the same time, the oxygen bubbles generated on the anode (2) can remove part of the carbon dioxide in the water sample through the stripping effect, thereby reducing the interference of carbon dioxide on the hydrogen conductivity test; The frame plate (1) is provided with a water sample inlet (12), a water sample outlet (13), an anode terminal (18), a cathode terminal (19), a lower water sample internal interface (22), an upper water sample internal interface (23) and a cable inlet (24); the panel (7) is provided with a window (11); the back plate (8) is provided with a polar water inlet (14) and a polar water outlet (15) for communicating with the slots in the slotted metal plate (6); The mesh cathode (5) is made of a corrosion-resistant metal mesh with a mesh size of 30-100.

2. A single-membrane integrated electrically regenerated cation exchanger for hydrogen conductivity testing according to claim 1, characterized in that: The mesh cathode (5) and the slotted metal plate (6) maintain close contact and direct electrical connection.

3. The single-membrane integrated electrically regenerated cation exchanger for hydrogen conductivity testing according to claim 1, characterized in that: The slotted metal plate (6) is provided with a lower polar water uniform distribution groove (20), an upper polar water uniform distribution groove (21), and a plurality of polar water grooves (16) arranged from bottom to top on a side close to the mesh cathode (5); the lower polar water uniform distribution groove (20) is respectively connected to the polar water inlet (14) and the lower end of the polar water groove (16); the upper polar water uniform distribution groove (21) is respectively connected to the polar water outlet (15) and the upper end of the polar water groove (16); the polar water is uniformly distributed through the slotted metal plate (6) structure, hydrogen bubbles generated on the cathode are promoted to be discharged, and the mesh cathode (5) is uniformly supported to prevent its deformation.

4. The single-membrane integrated electrically regenerated cation exchanger for hydrogen conductivity testing according to claim 1, characterized in that: The lower water sample evenly distributing member (9) and the upper water sample evenly distributing member (10) are both concave, and are provided with a plurality of slits with a width of 0.2-0.3 mm on the side facing the positive resin (3).

5. The single-membrane integrated electrically regenerated cation exchanger for hydrogen conductivity testing according to claim 1, characterized in that: The lower water sample internal interface (22) and the upper water sample internal interface (23) are respectively connected to the inlet and outlet of the flow switch (25).

6. The single-membrane integrated electrically regenerated cation exchanger for hydrogen conductivity testing according to claim 1, characterized in that: The water sample outlet (13) is connected to the inlet of the hydrogen conductivity detector circulation cell via a pipeline, and the outlet of the hydrogen conductivity detector circulation cell is connected to the polar water inlet (14).

7. The single-membrane integrated electrically regenerated cation exchanger for hydrogen conductivity testing according to claim 1, characterized in that: The integrated circuit board (26) has a current-adjustable DC output, measurement of electrolysis voltage and current, and automatic start-stop control functions according to the switch signal of the flow switch (25), and is provided with AC input, DC output, switch signal input terminals of the flow switch (25), and a communication interface corresponding to the display (27).

8. The single-membrane integrated electrically regenerated cation exchanger for hydrogen conductivity testing according to claim 1, characterized in that: The anode (2) is electrically connected to a positive terminal for outputting direct current in an integrated circuit board (26) via an anode terminal (18); and the slotted metal plate (6) is electrically connected to a negative terminal for outputting direct current in an integrated circuit board (26) via a cathode terminal (19).

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