An apparatus for preventing cathode crystallization in an alkaline hydrogen peroxide synthesis stack

Abstract

The utility model discloses a device for preventing cathode crystallization in alkaline hydrogen peroxide synthesis electric pile, be applied to electrochemical synthesis technical field, include: oxygen constant humidity system, cathode water circulation hydrogen peroxide concentration control system, cathode water circulation constant temperature system, anode lye circulation constant temperature system and controller, the controller synchronous control oxygen humidity in oxygen constant humidity system, hydrogen peroxide concentration in cathode water circulation hydrogen peroxide concentration control system, cathode temperature in cathode water circulation constant temperature system and anode temperature in anode lye circulation constant temperature system, to inhibit cathode to produce crystallization. The utility model not only has reduced the failure rate of electric pile operation, has also reduced the realization electric pile maintenance cost greatly, guarantees alkaline hydrogen peroxide synthesis electric pile's continuous stable operation, prolongs the life of electrode and alkaline hydrogen peroxide electrolytic cell.

Description

Technical Field

[0001] This utility model relates to the field of electrochemical synthesis technology, and more specifically to a device for preventing cathode crystallization in an alkaline hydrogen peroxide synthesis stack. Background Technology

[0002] Hydrogen peroxide can generate reactive substances (such as hydroxyl radicals ·OH and peroxyhydroxyl ions H₂) in alkaline media. Chlorine peroxide (CPO), also known as hydrogen peroxide, can react with unsaturated bonds (such as carbon-carbon double bonds and aromatic rings) in pigment molecules, causing decolorization of the chromophores in the pulp and thus improving pulp brightness. It is commonly used in single-stage bleaching, intermediate delignification, or final-stage bleaching processes and is an important chlorine-free bleaching agent. Hydrogen peroxide, however, is an extremely unstable strong oxidizing agent. If its storage or use is not handled properly, it can easily lead to explosions and other accidents. To reduce the risks and costs associated with using hydrogen peroxide, an alkaline hydrogen peroxide electrolysis production system has been developed. This system can directly provide alkaline hydrogen peroxide of different concentrations, reducing the need for dilution and mixing of high-concentration hydrogen peroxide, thereby lowering safety hazards during storage and mixing.

[0003] However, during the alkaline hydrogen peroxide electrolytic synthesis process, high-concentration, high-purity hydrogen peroxide solutions are prone to crystallization when temperatures fluctuate significantly. Crystallization can clog flow channels, reduce reaction efficiency, cover electrode active sites, increase resistance, and even lead to stack failure, severely impacting production efficiency and equipment lifespan. Current technologies lack coordinated control over the system providing reactants to the anode and cathode, resulting in unstable stack operation.

[0004] Therefore, how to provide a device for preventing cathode crystallization in an alkaline hydrogen peroxide synthesis fuel cell stack that can actively regulate the system environment to prevent cathode crystallization is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the present invention provides a device for preventing cathode crystallization in an alkaline hydrogen peroxide synthesis stack.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A device for preventing cathode crystallization in an alkaline hydrogen peroxide synthesis stack includes: an oxygen humidity control system, a cathode water circulation hydrogen peroxide concentration control system, a cathode water circulation temperature control system, an anode alkaline solution circulation temperature control system, and a controller. The controller synchronously controls the oxygen humidity in the oxygen constant humidity system, the hydrogen peroxide concentration in the cathode water circulation hydrogen peroxide concentration control system, the cathode temperature in the cathode water circulation constant temperature system, and the anode temperature in the anode alkaline solution circulation constant temperature system to suppress the formation of crystals on the cathode.

[0007] Optionally, the oxygen humidity control system includes: an air intake control valve and a humidification device connected in sequence to the pipeline through which oxygen is fed from the cathode to the alkaline hydrogen peroxide electrolyzer, and a humidity sensor disposed between the humidification device and the alkaline hydrogen peroxide electrolyzer. The controller simultaneously opens the intake control valve and the humidification device to introduce oxygen into the alkaline hydrogen peroxide electrolysis cell. The humidity sensor detects the oxygen humidity and feeds it back to the controller, which then controls the oxygen humidity to be within a preset range through the humidification device.

[0008] Optionally, the cathode water circulation hydrogen peroxide concentration control system includes: a cathode circulation tank and a cathode circulation pump connected in sequence to the alkaline hydrogen peroxide electrolyzer via pipelines, a first online hydrogen peroxide spectrometer and a water replenishment pump arranged in sequence between the cathode circulation tank and the cathode circulation pump, and a second online hydrogen peroxide spectrometer connected to the other side of the cathode circulation pump. The controller turns on the cathode circulation pump, and water is introduced from the cathode circulation tank into the alkaline hydrogen peroxide electrolysis cell. The first online hydrogen peroxide spectrometer detects the hydrogen peroxide concentration and feeds it back to the controller. When the hydrogen peroxide concentration is higher than the preset threshold, the water replenishment pump is started to inject deionized water for dilution. The second online hydrogen peroxide spectrometer detects the concentration of the diluted hydrogen peroxide and shuts off the water replenishment pump when the concentration is within the preset range, so as to control the hydrogen peroxide concentration within the preset range.

[0009] Optionally, the cathode water circulation constant temperature system includes: a first external temperature control module disposed between the cathode circulation pump and the alkaline hydrogen peroxide electrolyzer, including: a first temperature sensor, a first heating device and a first cooling device; The first temperature sensor detects the liquid temperature and feeds it back to the controller. When the liquid temperature is lower than the preset threshold, the controller automatically turns on the first heating device to heat the outside of the pipe. When the liquid temperature is higher than the preset threshold, the controller automatically turns on the first cooling device to cool the outside of the pipe, so as to control the cathode temperature within the preset range.

[0010] Optionally, the anolyl solution circulation constant temperature system includes: an anolyl circulation tank and an anolyl circulation pump connected in sequence to the alkaline hydrogen peroxide electrolyzer via pipelines, and a second external temperature control module disposed between the anolyl circulation pump and the alkaline hydrogen peroxide electrolyzer; wherein the second external temperature control module includes: a second temperature sensor, a second heating device, and a second cooling device; The controller turns on the anode circulation pump, and the alkaline solution is introduced from the anode circulation tank into the alkaline hydrogen peroxide electrolysis cell. The second temperature sensor detects the temperature of the alkaline solution and feeds it back to the controller. When the temperature of the alkaline solution is lower than the preset threshold, the controller automatically turns on the second heating device to heat the outside of the pipeline. When the temperature of the alkaline solution is higher than the preset threshold, the controller automatically turns on the second cooling device to cool the outside of the pipeline, so as to control the anode temperature within the preset range.

[0011] Optionally, the first cooling device and the second cooling device include at least a heat exchanger, an anode temperature control proportional valve, and a cold water pipe.

[0012] As can be seen from the above technical solution, compared with the prior art, this utility model discloses a device for preventing cathode crystallization in an alkaline hydrogen peroxide synthesis stack. It suppresses cathode crystallization through a four-fold mechanism of constant oxygen humidity control, real-time concentration control, and constant anode and cathode temperature control. At the same time, it achieves closed-loop control through a detection-control-execution system, eliminating the need for manual intervention. This not only reduces the failure rate of the stack operation but also significantly reduces the stack maintenance cost, ensures the continuous and stable operation of the alkaline hydrogen peroxide synthesis stack, and extends the lifespan of the electrodes and the alkaline hydrogen peroxide electrolyzer. Attached Figure Description

[0013] 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 embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the device structure provided by this utility model. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Example 1: Embodiment 1 of this utility model discloses a device for preventing cathode crystallization in an alkaline hydrogen peroxide synthesis stack, such as... Figure 1 As shown, it includes: an oxygen humidity control system, a cathode water circulation hydrogen peroxide concentration control system, a cathode water circulation temperature control system, an anode alkaline solution circulation temperature control system, and a controller; The controller synchronously controls the oxygen humidity in the oxygen constant humidity system, the hydrogen peroxide concentration in the cathode water circulation hydrogen peroxide concentration control system, the cathode temperature in the cathode water circulation constant temperature system, and the anode temperature in the anode alkaline solution circulation constant temperature system to suppress the formation of crystals on the cathode.

[0017] An oxygen constant humidity system includes: an inlet control valve XV301 and a humidification device H301 connected sequentially to a pipeline supplying oxygen from the cathode to the alkaline hydrogen peroxide electrolyzer; and a humidity sensor HC301 disposed between the humidification device H301 and the alkaline hydrogen peroxide electrolyzer; wherein the humidification device H301 includes at least a spray humidifier, a water bath humidifier, a wet film humidifier, and a steam humidifier.

[0018] The controller simultaneously opens the intake control valve XV30 and the humidification device H301 to introduce oxygen into the alkaline hydrogen peroxide electrolysis cell. The humidity sensor HC301 detects the oxygen humidity and feeds it back to the controller, which controls the oxygen humidity to be within the preset range through the humidification device H301.

[0019] The cathode water circulation hydrogen peroxide concentration control system includes: a cathode circulation tank V201 and a cathode circulation pump P201 connected in sequence to an alkaline hydrogen peroxide electrolyzer via pipelines; a first online hydrogen peroxide spectrometer HPD201 and a water replenishment pump P202 sequentially arranged between the cathode circulation tank V201 and the cathode circulation pump P201; and a second online hydrogen peroxide spectrometer HPD202 connected to the other side of the cathode circulation pump P201. The controller turns on the cathode circulation pump P201, and water is introduced from the cathode circulation tank V201 into the alkaline hydrogen peroxide electrolyzer. The first online hydrogen peroxide spectrometer HPD201 detects the hydrogen peroxide concentration and feeds it back to the controller. When the hydrogen peroxide concentration is higher than the preset threshold, the water replenishment pump P202 is started to inject deionized water for dilution. The second online hydrogen peroxide spectrometer HPD202 detects the concentration of the diluted hydrogen peroxide and, when the concentration is within the preset range, shuts off the water replenishment pump P202 to control the hydrogen peroxide concentration within the preset range (25000~55000 mg / L).

[0020] The cathode water circulation constant temperature system includes: a first external temperature control module set between the cathode circulation pump and the alkaline hydrogen peroxide electrolyzer, including: a first temperature sensor TIC201, a first heating device H201 and a first cooling device C201; The first temperature sensor TIC201 detects the liquid temperature and feeds it back to the controller. When the liquid temperature is lower than the preset threshold, the controller automatically turns on the first heating device H201 to heat the outside of the pipe. When the liquid temperature is higher than the preset threshold, the controller automatically turns on the first cooling device C201 to cool the outside of the pipe, so as to control the cathode temperature within the preset range (25℃~70℃).

[0021] The anolyte circulation constant temperature system includes: an anolyte circulation tank V101 and an anolyte circulation pump P101 connected in sequence to an alkaline hydrogen peroxide electrolyzer via pipelines; and a second external temperature control module disposed between the anolyte circulation pump V101 and the alkaline hydrogen peroxide electrolyzer P101; wherein the second external temperature control module includes: a second temperature sensor TIC101, a second heating device H101, and a second cooling device C101; The controller turns on the anode circulation pump P101, and the alkaline solution is introduced into the alkaline hydrogen peroxide electrolysis cell from the anode circulation tank V101. The second temperature sensor TIC101 detects the temperature of the alkaline solution and feeds it back to the controller. When the temperature of the alkaline solution is lower than the preset threshold, the controller automatically turns on the second heating device H101 to heat the outside of the pipeline. When the temperature of the alkaline solution is higher than the preset threshold, the controller automatically turns on the second cooling device C101 to cool the outside of the pipeline, so as to control the anode temperature within the preset range (25℃~70℃).

[0022] The first cooling device C201 and the second cooling device C101 each include at least a heat exchanger, an anode temperature-controlled proportional valve, and a cold water pipe. In this invention, the first cooling device C201 includes: a first heat exchanger E201, a first anode temperature-controlled proportional valve TV201, and a cold water pipe; the second cooling device C101 includes: a second heat exchanger E101, a second anode temperature-controlled proportional valve TV101, and a cold water pipe.

[0023] The first online hydrogen peroxide spectrometer HPD201 and the second online hydrogen peroxide spectrometer HPD202 can be online spectrometers, online refractive index meters, etc.

[0024] The first heating device H201 and the second heating device H101 can be pipe heaters, water baths, etc.

[0025] The controller can be a PLC controller or a microcontroller controller, etc.

[0026] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0027] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for preventing cathode crystallization within an alkaline hydrogen peroxide synthesis stack, characterized in that, include: Oxygen humidity control system, cathode water circulation hydrogen peroxide concentration control system, cathode water circulation temperature control system, anode alkaline solution circulation temperature control system, and controller; The controller synchronously controls the oxygen humidity in the oxygen constant humidity system, the hydrogen peroxide concentration in the cathode water circulation hydrogen peroxide concentration control system, the cathode temperature in the cathode water circulation constant temperature system, and the anode temperature in the anode alkaline solution circulation constant temperature system to suppress the formation of crystals on the cathode.

2. The device for preventing cathode crystallization in an alkaline hydrogen peroxide synthesis stack according to claim 1, characterized in that, The oxygen constant humidity system includes: an air intake control valve and a humidification device connected in sequence to the pipeline that inputs oxygen from the cathode to the alkaline hydrogen peroxide electrolyzer, and a humidity sensor disposed between the humidification device and the alkaline hydrogen peroxide electrolyzer. The controller simultaneously opens the air intake control valve and the humidification device to introduce oxygen into the alkaline hydrogen peroxide electrolysis cell. The humidity sensor detects the oxygen humidity and feeds it back to the controller. The humidification device controls the oxygen humidity to be within a preset range.

3. The device for preventing cathode crystallization in an alkaline hydrogen peroxide synthesis stack according to claim 1, characterized in that, The cathode water circulation hydrogen peroxide concentration control system includes: a cathode circulation tank and a cathode circulation pump that are connected in sequence to an alkaline hydrogen peroxide electrolyzer via pipelines; a first online hydrogen peroxide spectrometer and a water replenishment pump that are sequentially arranged between the cathode circulation tank and the cathode circulation pump; and a second online hydrogen peroxide spectrometer connected to the other side of the cathode circulation pump. The controller activates the cathode circulation pump, allowing water to flow from the cathode circulation tank into the alkaline hydrogen peroxide electrolysis cell. The first online hydrogen peroxide spectrometer detects the hydrogen peroxide concentration and sends feedback to the controller. When the hydrogen peroxide concentration exceeds a preset threshold, the water replenishment pump is activated to inject deionized water for dilution. The second online hydrogen peroxide spectrometer detects the diluted hydrogen peroxide concentration and, when the concentration falls within a preset range, shuts off the water replenishment pump to control the hydrogen peroxide concentration within the preset range.

4. The device for preventing cathode crystallization in an alkaline hydrogen peroxide synthesis stack according to claim 3, characterized in that, The cathode water circulation constant temperature system includes: a first external temperature control module disposed between the cathode circulation pump and the alkaline hydrogen peroxide electrolyzer, including: a first temperature sensor, a first heating device and a first cooling device; The first temperature sensor detects the liquid temperature and feeds it back to the controller. When the liquid temperature is lower than a preset threshold, the controller automatically turns on the first heating device to heat the outside of the pipe. When the liquid temperature is higher than the preset threshold, the controller automatically turns on the first cooling device to cool the outside of the pipe, so as to control the cathode temperature within a preset range.

5. The device for preventing cathode crystallization in an alkaline hydrogen peroxide synthesis stack according to claim 4, characterized in that, The anolyte circulation constant temperature system includes: an anolyte circulation tank and an anolyte circulation pump connected in sequence to the alkaline hydrogen peroxide electrolyzer via pipelines; and a second external temperature control module disposed between the anolyte circulation pump and the alkaline hydrogen peroxide electrolyzer; wherein the second external temperature control module includes: a second temperature sensor, a second heating device, and a second cooling device. The controller turns on the anode circulation pump, and the alkaline solution is introduced from the anode circulation tank into the alkaline hydrogen peroxide electrolysis cell. The second temperature sensor detects the temperature of the alkaline solution and feeds it back to the controller. When the temperature of the alkaline solution is lower than the preset threshold, the controller automatically turns on the second heating device to heat the outside of the pipeline. When the temperature of the alkaline solution is higher than the preset threshold, the controller automatically turns on the second cooling device to cool the outside of the pipeline, so as to control the anode temperature within the preset range.

6. The device for preventing cathode crystallization in an alkaline hydrogen peroxide synthesis stack according to claim 5, characterized in that, The first and second cooling devices include at least a heat exchanger, an anode temperature control proportional valve, and a cold water pipe.

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