Self-exchange electricity regeneration hydrogen conductivity on-line monitoring system and method

Abstract

The invention discloses a self-exchange electricity regeneration hydrogen conductivity online monitoring system and method, and belongs to the technical field of hydrogen conductivity measurement. An air switch, an AC-DC converter, a PLC controller, an integrated relay set, a fuse and a control flowmeter of the system are connected in sequence. The pressure difference transmitter is respectively connected with the anode and the first cation exchange membrane; the control flowmeter, the microfiltration membrane group and the water inlet three-way valve are connected in sequence; the fuse is connected with the voltage regulator and the hydrogen conductivity display instrument; the backwashing pump is connected to a connecting line between the fuse and the hydrogen conductivity display instrument; the voltage regulator is respectively connected with the cathode and the anode; the hydrogen conductivity display instrument is externally connected with a measuring electrode, and the measuring electrode is arranged in the measuring cell; the backwashing pump is connected with the drainage three-way valve; the DCS, the signal conversion module and the computer are sequentially connected, and the hydrogen conductivity display instrument is connected to a connecting line of the DCS and the signal conversion module. According to the invention, the conductivity of hydrogen in water can be accurately and rapidly measured, and stable operation of the process is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen conductivity measurement, and in particular to an online monitoring system and method for self-exchange electric regeneration hydrogen conductivity. Background Art

[0002] The traditional online measurement method of hydrogen conductivity uses cation exchange resin regeneration technology. This technology has a large measurement blind spot, and the cation exchange resin needs to be replaced and regenerated frequently. The regeneration process of the cation exchange resin consumes a lot of manpower and material resources and produces a large amount of waste acid. The regeneration degree of the regenerated cation exchange resin is not high, and some even have cracks, which has a great impact on the accuracy of online hydrogen conductivity detection.

[0003] Electrically regenerated ion exchange technology is the most widely used and mainstream technology in industry. This method organically combines ion migration technology with membrane exchange technology, greatly improving the effect of ion exchange resin on the regeneration degree of ion exchange. However, the current electrical regeneration technology mainly measures data through the electrical regeneration module and then through the conductivity electrode / meter. All interference factors of the electrical regeneration module will have a certain impact on the measurement speed and accuracy of hydrogen conductivity, such as unreasonable design of the electrical regeneration module, influence of electrolytic gas, concentration polarization, voltage size, electrode material, etc. Therefore, a self-exchange electrical regeneration hydrogen conductivity online monitoring system is needed to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to provide an online monitoring system and method for the conductivity of self-exchange electric regeneration hydrogen.

[0005] An online monitoring system for self-exchange electric regeneration hydrogen conductivity, comprising a self-exchange electric regeneration unit, a hydrogen conductivity measurement and data transmission and analysis unit, and an electrical and backwashing unit;

[0006] The self-exchange electric regeneration unit includes a microfiltration membrane group, a control flow meter, a voltage regulator, a three-chamber two-pole double-membrane electrolytic cell and a differential pressure transmitter; the three-chamber two-pole double-membrane electrolytic cell includes an anode, a first cation exchange membrane, a second cation exchange membrane, a cathode, and a cation exchange resin;

[0007] The hydrogen conductivity measurement and data transmission analysis unit includes a measuring cell, a measuring electrode, a hydrogen conductivity display, a DCS, a signal conversion module and a computer;

[0008] The electrical and backwash unit includes an air switch, an AC / DC converter, a PLC controller, an integrated relay group, a fuse, a water inlet three-way valve, a water outlet three-way valve and a backwash pump;

[0009] Among them, the air switch, AC / DC converter, PLC controller, integrated relay group, fuse, and control flowmeter are connected in sequence; cation exchange resin is installed between the first cation exchange membrane and the second cation exchange membrane; the differential pressure transmitter is connected to the anode and the first cation exchange membrane respectively; the control flowmeter, microfiltration membrane group, and water inlet three-way valve are connected in sequence; the fuse is connected to the voltage regulator and the hydrogen conductivity display respectively; the backwash pump is connected to the connecting line between the fuse and the hydrogen conductivity display; the voltage regulator is connected to the cathode and the anode respectively; the hydrogen conductivity display is connected to the external measuring electrode, and the measuring electrode is placed in the measuring cell; the water inlet and outlet of the measuring cell are connected to the middle channel composed of the first cation exchange membrane and the second cation exchange membrane, and the anode chamber composed of the first cation exchange membrane and the anode through pipelines; the backwash pump is connected to the drainage three-way valve; the DCS, the signal conversion module and the computer are connected in sequence, and the hydrogen conductivity display is connected to the connecting line between the DCS and the signal conversion module.

[0010] A monitoring method for an online monitoring system for self-exchange electric regeneration hydrogen conductivity comprises the following steps:

[0011] Connect the power cord of the device, turn on the air switch, and start the AC / DC converter; start the hydrogen conductivity display, activate the measuring electrode and put it into the pre-set clamping position of the measuring cell;

[0012] During monitoring, water flows from the water inlet three-way valve through the microfiltration membrane group and the control flowmeter, and then enters the middle channel formed by the first cation exchange membrane and the second cation exchange membrane. The cations in the solution are replaced by the hydrogen ions on the cation exchange resin. After replacement, the water flows through the pipeline into the measuring pool, and the hydrogen conductivity signal is sent by the measuring electrode and transmitted to the hydrogen conductivity display instrument for display. The measurement signal is also introduced into the DCS and transmitted to the computer through the signal conversion module.

[0013] After monitoring, the water enters the anode chamber composed of the anode and the first cation exchange membrane through the upper outlet of the measuring pool. The hydrogen ions in the water cross the first cation exchange membrane under the action of the electric field and enter the middle channel to regenerate the cation exchange resin; the water outlet from the anode chamber enters the cathode chamber composed of the second cation exchange membrane and the cathode, receives the cations transmitted from the middle channel across the second cation exchange membrane and is discharged through the drainage three-way valve; when no monitoring is performed for a long time, the backwash pump is started to let water in from the drainage three-way valve to backwash the system.

[0014] The beneficial effects of the present invention are:

[0015] 1. The system of the present invention is designed with a three-chamber two-pole double-membrane electrolytic cell, which improves the continuity of the measurement process;

[0016] 2. The system of the present invention can realize the online accurate and rapid measurement of hydrogen conductivity in water, opening up a new way to measure hydrogen conductivity in water, solving the problems of the original measuring device for the original ion exchange resin regeneration process, the limited regeneration degree, etc., effectively making up for the shortcomings of the current online measurement device for electric regeneration hydrogen conductivity, and ensuring the safe and stable operation of the industrial process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the online monitoring system for the conductivity of self-exchange electric regeneration hydrogen of the present invention. DETAILED DESCRIPTION

[0018] The present invention provides an online monitoring system and method for the conductivity of self-exchange electric regeneration hydrogen, which will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0019] Figure 1 The structure diagram of the self-exchange electric regeneration hydrogen conductivity online monitoring system of the present invention is shown in FIG. The system includes a self-exchange electric regeneration unit, a hydrogen conductivity measurement and data transmission and analysis unit, and an electrical and backwashing unit;

[0020] The self-exchange electric regeneration unit includes a microfiltration membrane group 7, a control flow meter 8, a voltage regulator 9, a three-chamber two-pole double-membrane electrolytic cell 10 and a differential pressure transmitter 10-6; the three-chamber two-pole double-membrane electrolytic cell 10 includes an anode 10-1, a first cation exchange membrane 10-2, a second cation exchange membrane 10-3, a cathode 10-4, and a cation exchange resin 10-5;

[0021] The hydrogen conductivity measurement and data transmission analysis unit includes a measuring cell 11, a measuring electrode 12, a hydrogen conductivity display 13, a DCS 16, a signal conversion module 17 and a computer 18;

[0022] The electrical and backwashing unit includes an air switch 1, an AC / DC converter 2, a PLC controller 3, an integrated relay group 4, a fuse 5, a water inlet three-way valve 6, a water discharge three-way valve 14 and a backwashing pump 15;

[0023] Among them, the air switch 1, the AC / DC converter 2, the PLC controller 3, the integrated relay group 4, the fuse 5, and the control flowmeter 8 are connected in sequence; the first cation exchange membrane 10-2 and the second cation exchange membrane 10-3 are provided with a cation exchange resin 10-5; the differential pressure transmitter 10-6 is respectively connected to the anode 10-1 and the first cation exchange membrane 10-2, and the range of the measured differential pressure is ±0.1MPa; the control flowmeter 8, the microfiltration membrane group 7, and the water inlet three-way valve 6 are connected in sequence; the fuse 5 is respectively connected to the voltage regulator 9 and the hydrogen conductivity display 13; the backwash pump 15 is connected to the connecting line between the fuse 5 and the hydrogen conductivity display 13; the voltage regulator The regulator 9 is connected to the cathode 10-4 and the anode 10-1 respectively, and provides a DC voltage of 0 to 220V; the hydrogen conductivity display 13 is externally connected to the measuring electrode 12, and the measuring electrode 12 is placed in the measuring cell 11; the water inlet and the water outlet of the measuring cell 11 are connected to the middle channel formed by the first cation exchange membrane 10-2 and the second cation exchange membrane 10-3, and the anode chamber formed by the first cation exchange membrane 10-2 and the anode 10-1 through pipelines; the backwash pump 15 is connected to the drainage three-way valve 14; the DCS 16, the signal conversion module 17 and the computer 18 are connected in sequence, and the hydrogen conductivity display 13 is connected to the connecting line between the DCS 16 and the signal conversion module 17. The signal conversion module 17 adopts the RS485 communication module, and the communication protocol is the Modbus protocol.

[0024] Example 1

[0025] When the self-exchange electric regeneration hydrogen conductivity online monitoring system is working, connect the power cord of the device, turn on the air switch 1, and start the AC-DC converter 2. Secondly, start the hydrogen conductivity display 13, activate the measuring electrode 12 and put it into the pre-set clamping position of the measuring cell 11; during measurement, water flows from the electric water inlet three-way valve 6 through the microfiltration membrane group 7 as system water inlet, and enters the middle channel of the three-chamber two-pole double-membrane electrolytic cell 10 (between the first cation exchange membrane 10-2 and the second cation exchange membrane 10-3) after being measured by the control flowmeter 8, and the cations in the solution are replaced by the hydrogen ions on the cation exchange resin 10-5; after the exchange, the water flows through the bottom into the measuring cell 11, and the hydrogen conductivity signal is given by the measuring electrode 12, and the signal is displayed by the hydrogen conductivity display 13, and the measurement signal can be simultaneously introduced Enter DCS16 and transmit to the upper computer 18 by wireless mode through the signal conversion module 17; after measurement, the water body enters the anode chamber of the electrolytic cell (between the anode 10-1 and the first cation exchange membrane 10-2) through the upper water outlet of the measuring cell 11; in the anode chamber, the hydrogen ions in the water cross the first cation exchange membrane 10-2 under the action of the electric field and enter the middle channel to regenerate the cation exchange resin 10-5; the anode chamber outlet water enters the cathode chamber (between the second cation exchange membrane 10-3 and the cathode 10-4), and after receiving the cations transmitted by the second cation exchange membrane 10-3, it is discharged as system drainage through the electric drainage three-way valve 14. The voltage of the electrolytic cell is regulated by the voltage regulator 9. The flow rate is controlled by the pressure difference signal of the pressure difference transmitter 10-6. When it is not used for a long time, a backwash pump 15 is used to inlet water from the system electric drainage three-way valve 14 for backwashing, and the backwashing logic is controlled by the PLC controller 3.

[0026] Example 2

[0027] When the self-exchange electricity regeneration hydrogen conductivity online monitoring system is working, connect the power cord of the device, turn on the air switch 1, and start the AC-DC converter 2. Secondly, start the hydrogen conductivity display 13, activate the measuring electrode 12 and put it into the pre-set clamping position of the measuring cell 11; during measurement, water flows from the manual water inlet three-way valve 6 through the microfiltration membrane group 7 as system water inlet, and enters the middle channel of the three-chamber two-pole double-membrane electrolytic cell 10 (between the first cation exchange membrane 10-2 and the second cation exchange membrane 10-3) after being measured by the control flowmeter 8, and the cations in the solution are replaced by the hydrogen ions on the cation exchange resin 10-5; after the exchange, the water flows through the bottom into the measuring cell 11, and the hydrogen conductivity signal is given by the measuring electrode 12, and the signal is displayed by the hydrogen conductivity display 13, and the measurement signal can be simultaneously introduced Enter DCS16 and transmit to the upper computer 18 by wire through the signal conversion module 17; after measurement, the water body enters the anode chamber of the electrolytic cell (between the anode 10-1 and the first cation exchange membrane 10-2) through the upper water outlet of the measuring cell 11; in the anode chamber, the hydrogen ions in the water cross the first cation exchange membrane 10-2 under the action of the electric field and enter the middle channel to regenerate the cation exchange resin 10-5; the anode chamber outlet water enters the cathode chamber (between the second cation exchange membrane 10-3 and the cathode 10-4), and after receiving the cations transmitted by the second cation exchange membrane 10-3, it is discharged as system drainage through the manual drainage three-way valve 14. The voltage of the electrolytic cell is regulated by the voltage regulator 9. The flow rate is controlled by the pressure difference signal of the pressure difference transmitter 10-6. When it is not used for a long time, a backwash pump 15 is used to inlet water from the system manual drainage three-way valve 14 for backwashing, and the backwashing time is controlled by the PLC controller 3.

[0028] Example 3

[0029] When the self-exchange electric regeneration hydrogen conductivity online monitoring system is working, connect the power cord of the device, turn on the air switch 1, and start the AC-DC converter 2. Secondly, start the hydrogen conductivity display 13, activate the measuring electrode 12 and put it into the pre-set clamping position of the measuring cell 11; during measurement, water flows from the electric water inlet three-way valve 6 through the microfiltration membrane group 7 as system water, and enters the middle channel of the three-chamber two-pole double-membrane electrolytic cell 10 (between the first cation exchange membrane 10-2 and the second cation exchange membrane 10-3, in this embodiment, the first cation exchange membrane 10-2 is a proton exchange membrane), and the cations in the solution are replaced by the hydrogen ions on the cation exchange resin 10-5; after the exchange, the water flows through the bottom into the measuring cell 11, and the hydrogen conductivity signal is given by the measuring electrode 12, and the signal is displayed by the hydrogen conductivity display 1 3 shows that the measurement signal can be simultaneously introduced into the DCS 16 and transmitted to the upper computer 18 by wireless means through the signal conversion module 17; after measurement, the water body enters the anode chamber of the electrolytic cell (between the anode 10-1 and the first cation exchange membrane 10-2) through the upper water outlet of the measuring cell 11; in the anode chamber, the hydrogen ions in the water cross the first cation exchange membrane 10-2 under the action of the electric field and enter the middle channel to regenerate the cation exchange resin 10-5; the anode chamber outlet water enters the cathode chamber (between the second cation exchange membrane 10-3 and the cathode 10-4), and after receiving the cations transmitted by the second cation exchange membrane 10-3, it is discharged as system drainage through the electric drainage three-way valve 14. The voltage of the electrolytic cell is regulated by the voltage regulator 9. The flow rate is controlled by the pressure difference signal of the pressure difference transmitter 10-6. When it is not used for a long time, a backwash pump 15 is used to inlet water from the system electric drainage three-way valve 14 for backwashing, and the backwashing logic is controlled by the PLC controller 3.

[0030] In order to accurately obtain the hydrogen conductivity in water, the device of the present invention has developed a three-cavity two-pole double-membrane electrolytic cell, which improves the continuity of the measurement process; the device of the present invention has opened up a new way to measure the hydrogen conductivity in water, and solved the problems of the original measuring device for the original ion exchange resin regeneration process being complicated and the regeneration degree being limited, and effectively made up for the shortcomings of the current online measurement device for electric regeneration hydrogen conductivity, which is beneficial to the rapid and accurate measurement and control of hydrogen conductivity in industrial processes such as water treatment, so as to ensure the safe and stable operation of the industrial process.

Claims

1. An online monitoring system for the conductivity of self-exchange electroregeneration hydrogen, characterized in that: The system includes a self-exchange electrical regeneration unit, a hydrogen conductivity measurement and data transmission analysis unit, and an electrical and backwash unit; The self-exchange electricity regeneration unit comprises a microfiltration membrane group (7), a control flow meter (8), a voltage regulator (9), a three-chamber two-pole double-membrane electrolytic cell (10) and a differential pressure transmitter (10-6); the three-chamber two-pole double-membrane electrolytic cell (10) comprises an anode (10-1), a first cation exchange membrane (10-2), a second cation exchange membrane (10-3), a cathode (10-4), and a cation exchange resin (10-5); The hydrogen conductivity measurement and data transmission analysis unit comprises a measuring cell (11), a measuring electrode (12), a hydrogen conductivity display (13), a DCS (16), a signal conversion module (17) and a computer (18); The electrical and backwashing unit comprises an air switch (1), an AC / DC converter (2), a PLC controller (3), an integrated relay group (4), a fuse (5), a water inlet three-way valve (6), a water discharge three-way valve (14) and a backwashing pump (15); The air switch (1), the AC / DC converter (2), the PLC controller (3), the integrated relay group (4), the fuse (5), and the control flow meter (8) are connected in sequence; a cation exchange resin (10-5) is installed between the first cation exchange membrane (10-2) and the second cation exchange membrane (10-3); the differential pressure transmitter (10-6) is connected to the anode (10-1) and the first cation exchange membrane (10-2) respectively; the control flow meter (8), the microfiltration membrane group (7), and the water inlet three-way valve (6) are connected in sequence; the fuse (5) is connected to the voltage regulator (9) and the hydrogen conductivity display (13) respectively; the backwash pump (15) is connected to the connecting line between the fuse (5) and the hydrogen conductivity display (13); the voltage regulator (10-6 ...10-1) and the first cation exchange membrane (10-2) respectively; the voltage regulator (10-6) is connected to the voltage regulator (10-1) and the first cation exchange membrane (10-2) respectively; the voltage regulator (10-6) is connected to the voltage regulator (10-1) and the first cation exchange membrane The device (9) is connected to the cathode (10-4) and the anode (10-1) respectively; the hydrogen conductivity display (13) is externally connected to the measuring electrode (12), and the measuring electrode (12) is placed in the measuring cell (11); the water inlet and the water outlet of the measuring cell (11) are respectively connected to the middle channel formed by the first cation exchange membrane (10-2) and the second cation exchange membrane (10-3), and the anode chamber formed by the first cation exchange membrane (10-2) and the anode (10-1) through pipelines; the backwash pump (15) is connected to the drainage three-way valve (14); the DCS (16), the signal conversion module (17) and the computer (18) are connected in sequence, and the hydrogen conductivity display (13) is connected to the connecting line between the DCS (16) and the signal conversion module (17).

2. The online monitoring system for self-exchange electric regeneration hydrogen conductivity according to claim 1 is characterized in that: The voltage regulator (9) provides a DC voltage of 0 to 220V.

3. The online monitoring system for self-exchange electric regeneration hydrogen conductivity according to claim 1 is characterized in that: The differential pressure transmitter (10-6) measures differential pressure in a range of ±0.1 MPa.

4. The online monitoring system for self-exchange electric regeneration hydrogen conductivity according to claim 1 is characterized in that: The PLC controller (3) controls the backwash logic.

5. The online monitoring system for self-exchange electric regeneration hydrogen conductivity according to claim 1 is characterized in that: The signal conversion module (17) is an RS485 communication module.

6. The online monitoring system for the conductivity of self-exchange electric regeneration hydrogen according to claim 5, characterized in that: The communication protocol of the signal conversion module (17) is the Modbus protocol.

7. The online monitoring system for the conductivity of self-exchange electric regeneration hydrogen according to claim 1 is characterized in that: The water inlet three-way valve (6) and the water discharge three-way valve (14) are manual.

8. The online monitoring system for the conductivity of self-exchange electric regeneration hydrogen according to claim 1 is characterized in that: The water inlet three-way valve (6) and the water discharge three-way valve (14) are electric.

9. A monitoring method for the online monitoring system for the conductivity of self-exchange electric regeneration hydrogen according to claim 1, characterized in that: The following steps are involved: Connect the power cord of the device, turn on the air switch (1), start the AC / DC converter (2); start the hydrogen conductivity display (13), activate the measuring electrode (12), and place it into the pre-set clamping position of the measuring cell (11); During monitoring, water flows from the water inlet three-way valve (6) through the microfiltration membrane group (7) and the control flow meter (8) in sequence and then enters the intermediate channel formed by the first cation exchange membrane (10-2) and the second cation exchange membrane (10-3), and the cations in the solution are replaced by the hydrogen ions on the cation exchange resin (10-5); after the replacement, the water flows through the pipeline into the measuring cell (11), and the hydrogen conductivity signal is emitted by the measuring electrode (12) and transmitted to the hydrogen conductivity display (13) for display. The measurement signal is simultaneously introduced into the DCS (16) and transmitted to the computer (18) via the signal conversion module (17); After monitoring, the water enters the anode chamber formed by the anode (10-1) and the first cation exchange membrane (10-2) through the upper water outlet of the measuring cell (11), and the hydrogen ions in the water cross the first cation exchange membrane (10-2) under the action of the electric field and enter the intermediate channel to regenerate the cation exchange resin (10-5); the water outlet from the anode chamber enters the cathode chamber formed by the second cation exchange membrane (10-3) and the cathode (10-4), receives the cations transmitted from the intermediate channel across the second cation exchange membrane (10-3), and is discharged through the drainage three-way valve (14); when no monitoring is performed for a long time, the backwash pump (15) is started to feed water into the backwash system from the drainage three-way valve (14).

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