A system for reducing degradation products of a working solution of a hydrogen peroxide device

Abstract

This utility model relates to a system for reducing degradation products of the working fluid in a hydrogen peroxide device. The system includes a storage tank with an inlet at the top connected to a wastewater pipe. The storage tank also contains a stirring assembly, a drain pipe, and a waste discharge pipe. The drain pipe extends to one side and connects to a dehydration assembly. The bottom of the dehydration assembly is connected to a clay bed via a water supply pipe. The outlet at the bottom of the clay bed is connected to a hydrogenation reactor. This application employs a combination of an air flotation structure and a flocculant to initially filter the working fluid. Multiple coalescers are then used to effectively reduce the water content in the working fluid, facilitating further treatment of the recovered liquid by the clay bed. During this process, multiple coalescers work alternately, effectively improving the overall recovery efficiency of the equipment.

Description

Technical Field

[0001] This utility model relates to the technical field of hydrogen peroxide production equipment, specifically to a system for reducing degradation products in the working fluid of a hydrogen peroxide production unit. Background Technology

[0002] Currently, most hydrogen peroxide production plants in China use anthraquinone-based working fluids. During operation, the working fluid passes through a hydrogenation reactor to generate hydrogen anthraquinone, which is then reduced to anthraquinone in an oxidation reactor to produce hydrogen peroxide. After extraction and purification, qualified hydrogen peroxide is produced. The working fluid is recycled within the system. Over long-term use, the anthraquinone in the working fluid degrades. As the amount of degradation products increases, it can severely affect hydrogenation efficiency and the quality of hydrogen peroxide extraction in subsequent processes, ultimately causing the plant to malfunction. Therefore, researching ways to reduce degradation products in the working fluid of hydrogen peroxide plants is urgent and of great significance for improving the long-term stable operation of the plant.

[0003] To address the issue of degradation products in the working fluid, existing hydrogen peroxide production units typically remove a portion of the working fluid at the outlet of the hydrogenation reactor, with approximately 20% entering a clay bed (alumina) for regeneration. Through adsorption by the alumina, the degradation products in the working fluid are removed, thus purifying the working fluid.

[0004] While this treatment method can reduce the degradation products of the working fluid, a certain amount of water will be introduced during the recycling of the working fluid, especially in the extraction process. Water has a significant impact on the service life of alumina, greatly reducing its service life. This will shorten the service life of the clay bed and make it impossible to achieve long-term stable operation.

[0005] Therefore, there is an urgent need for a highly efficient recovery device that can simultaneously remove degradation products and water from the working fluid and can operate continuously without interruption. Utility Model Content

[0006] Based on the above description, this utility model provides a system for reducing the degradation products of the working fluid in a hydrogen peroxide device, in order to solve the problem that existing working fluid recovery equipment cannot separate the water contained in the working fluid, which leads to a reduction in the service life of the clay bed, thereby increasing the recovery cost and affecting the recovery efficiency.

[0007] This utility model is achieved through the following technical solution: A system for reducing degradation products of working fluid in a hydrogen peroxide unit includes a storage tank, an inlet at the top of which is connected to a wastewater pipe, a stirring assembly inside the storage tank, a drain pipe and a debris discharge pipe on the storage tank, wherein the drain pipe extends to one side and is connected to a dehydration assembly, the bottom of the dehydration assembly is connected to a clay bed via a water supply pipe, and the outlet at the bottom of the clay bed is connected to a hydrogenation reactor.

[0008] Based on the above technical solution, the present invention can be further improved as follows.

[0009] Furthermore, the stirring assembly includes a stirring shaft vertically disposed at the center of the interior of the storage tank. The stirring shaft is provided with stirring blades, and both the upper and lower ends of the stirring shaft are movably connected to the inner top and inner bottom surfaces of the storage tank through ball bearings. The top of the storage tank is also provided with a stirring motor and is connected to the stirring shaft for transmission.

[0010] Furthermore, the stirring shaft and stirring blades are hollow inside and have several spray holes on the outer side wall. The bottom end of the stirring shaft extends downward to the outside of the storage tank and has a through hole on the end face. A ball bearing is provided on the inner side wall of the through hole and a gas supply pipe is inserted therein. The gas supply pipe extends outward and is connected to the air pump.

[0011] Furthermore, the dewatering assembly includes a housing with multiple mounting slots running through it. Each mounting slot contains a coalescer fixed with flange bolts. Diverter pipes are arranged at intervals at the top and bottom of the coalescer. One end of each diverter pipe converges towards the center and connects to a drain pipe, while the other end of each diverter pipe branches into several branch pipes, each corresponding to one of the multiple coalescers.

[0012] Furthermore, each branch pipe on the diversion pipe is equipped with a solenoid valve.

[0013] Furthermore, a sewage pipe is provided on one side of the bottom of the coalescer. The top surface of the sewage pipe is connected to the bottom opening of the coalescer, and one end of the sewage pipe faces outward and is connected to the recycling tank.

[0014] Furthermore, the surface of the storage tank is also equipped with an observation window and a pH sensor.

[0015] Furthermore, a flow pump is also installed on the drain pipe.

[0016] Compared with the prior art, the technical solution of this application has the following beneficial technical effects: 1. This application improves upon existing working fluid recovery equipment in hydrogen peroxide production units by combining an air flotation structure with flocculants to initially filter the working fluid. Then, multiple coalescers work simultaneously, which not only effectively separates the waste residue from the working fluid sequentially but also effectively reduces the water content in the working fluid, facilitating further processing of the recovered fluid by the clay bed. In this process, the water in the working fluid can be effectively prevented from affecting the active aluminum, thereby extending the service life of the clay bed and reducing recovery costs. 2. In this embodiment, multiple coalescers are used to work alternately. This not only allows for the periodic replacement of the internal filter elements of the coalescers, but also ensures that the equipment can continue to function normally during the replacement process, thereby effectively improving the overall recycling efficiency of the equipment. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the entire system in this embodiment; Figure 2 This is a schematic diagram of the liquid storage tank in this embodiment; Figure 3 This is a schematic diagram of the stirring assembly in this embodiment; Figure 4 This is a schematic diagram of the dehydration component in this embodiment; Figure 5 This is a schematic diagram of the connection structure of multiple coalescers in this embodiment; The components include: 1. Storage tank; 11. Drain pipe; 12. Waste discharge pipe; 13. Flow pump; 2. Stirring assembly; 21. Stirring motor; 22. Stirring shaft; 23. Stirring blades; 24. Air supply pipe; 25. Air pump; 3. Dehydration assembly; 31. Box body; 32. Mounting groove; 33. Coalescer; 34. Diversion pipe; 35. Sewage pipe; 4. White clay bed. Detailed Implementation

[0018] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0020] Combination Figure 1-5 As shown, a system for reducing degradation products of the working fluid in a hydrogen peroxide unit includes: Storage tank 1; the top inlet is connected to the wastewater pipe to recover and store the working fluid discharged from the hydrogen peroxide production unit; The stirring component 2 is installed inside the storage tank 1. It is used in conjunction with the addition of flocculants and other substances to adjust the pH value of the working solution and accelerate the settling speed inside the storage tank 1 so as to initially separate impurities in the working solution. The dehydration component 3 is located on one side of the storage tank 1 and is connected to the storage tank 1. It is used to separate the water in the working liquid after preliminary filtration and reduce its water content. White clay bed 4 is used to further filter the dehydrated working fluid. Through the adsorption of active aluminum, the degradation products and water in the working fluid are completely removed, thereby purifying the working fluid.

[0021] Specifically, in this embodiment, the storage tank 1 is provided with a drain pipe 11 and a waste discharge pipe 12. The drain pipe 11 is a single, corrosion-resistant flexible hose that is inserted into the storage tank 1 from top to bottom. The waste discharge pipe 12 consists of two pipes, one of which is located at the bottom of the storage tank 1 to periodically discharge impurities formed by sedimentation, and the other is located on one side of the drain pipe 11 and extends vertically downward into the tank body.

[0022] The stirring assembly 2 includes a stirring shaft 22 that is vertically arranged at the center of the storage tank 1. Both ends of the stirring shaft 22 are movably assembled with the inner top and inner bottom surfaces of the storage tank 1 via ball bearings. Stirring blades 23 are also provided on the outer wall of the stirring shaft 22 to accelerate the mixing and sedimentation efficiency of the recovered liquid by stirring. A stirring motor 21 is also provided at the top of the storage tank 1 and is drivenly connected to the top of the stirring shaft 22.

[0023] In the actual recovery process, the pH value of the initially recovered working fluid needs to be adjusted to stabilize it between 5 and 6. Therefore, a pH sensor for detecting the working fluid should be installed on the storage tank 1. The pH sensor is preferably a Suyi SY-ID-101 to display its pH value in real time so that the staff can adjust it using phosphoric acid and inorganic acid.

[0024] After adjusting the pH value to the specified range, alum and flocculant are added sequentially and stirred. The alum is dispersed evenly by rapid stirring (100-200 r / min) and hydrolyzed to generate aluminum hydroxide colloid, completing the destabilization and initial coagulation of the colloid. Then, the organic flocculant (such as PAM, concentration 0.1-1 mg / L) is stirred slowly (30-60 r / min) to promote the aggregation of micro flocs into large flocs. At this time, the floc particle size increases and the structure becomes loose.

[0025] To further improve the above-mentioned feeding and separation filtration method, the stirring shaft 22 and stirring blade 23 should be made hollow and interconnected, and several spray holes should be provided on the surface of the stirring shaft 22 and stirring blade 23. The spray holes adopt a microporous structure similar to an aeration head to avoid sewage backflow and blockage.

[0026] The bottom end of the stirring shaft 22 extends downward to the bottom of the liquid storage tank 1 and has a through hole on its end face. A ball bearing is provided on the inner wall of the through hole and is inserted into an air supply pipe 24. An air pump 25 is equipped on the air supply pipe 24. Clean air is continuously supplied to form a large number of bubbles in the liquid. These bubbles are used to capture the larger flocs. In this process, the bubbles adhere to the surface of the flocs to form a "gas-solid complex", which floats to the water surface to form scum. Then, the impurity discharge pipe 12 is extended to the liquid surface and the surface liquid and impurities suspended on the surface are extracted by means of extraction, thereby completing the initial purification.

[0027] The subsequent liquid is separated into layers through sedimentation. Then, the layered working liquid is pumped to the dehydration component 3 using the drain pipe 11. The remaining impurities and some residual liquid are discharged through the top discharge pipe 12. These impurities are then collected and recycled to the recycling tank for centralized treatment.

[0028] The dehydration assembly 3 includes a housing 31 with multiple mounting slots 32 running through it. Each mounting slot 32 has a coalescer 33 fixedly mounted on it. The coalescer 33 is preferably ZJCR-8KF-04.1φ150*600. The coalescer 33 can adsorb and combine tiny water droplets through the filter element to form larger water droplets. The remaining working liquid then separates from the coalescer due to the density difference. The coalescer 33 is locked and fixed by a flange. Diverter pipes 34 are arranged at intervals at the top and bottom of the coalescer 33. One end of the diverter pipe 34 converges towards the center and is connected to the drain pipe 11 on the storage tank 1. The other end is distributed into several branch pipes, and each branch pipe is connected to an interface on a coalescer 33.

[0029] The top-mounted diversion pipe 34 is used to divert the working liquid from the initial filtration, allowing it to be supplied to multiple coalescers 33 simultaneously. The bottom-mounted diversion pipe 34 is used to collect the dehydrated working liquid and discharge it into the subsequent clay bed 4 for final filtration.

[0030] In this structure, the filter element of coalescer 33 needs to be replaced regularly. In order to achieve uninterrupted continuous production, a solenoid valve should be equipped on the branch pipe of the diversion pipe 34. By controlling the opening and closing of the solenoid valve, a coalescer 33 can be disassembled and maintained in a specific direction. During this process, other coalescer 33 can still work normally, thereby achieving continuous uninterrupted production.

[0031] In addition, multiple storage tanks 1 and stirring components 2 should also be set up, that is, multiple storage tanks 1 can be used in conjunction with dehydration components 3 for continuous supply. Since a single filtration and sedimentation requires a certain amount of time to initially separate the working liquid, multiple storage tanks 1 can be used to work alternately to achieve continuous supply.

[0032] In the actual supply process, it is also necessary to control the injection volume. Therefore, a flow pump 13 should be equipped on the drain pipe 11. The flow pump 13 can preferably be a SEKO electromagnetic diaphragm metering pump DMS200, so that the supplied working fluid is kept constant and the stability of equipment operation is guaranteed.

[0033] Below the coalescer 33, there is also a sewage pipe 35, which is connected to the opening at the bottom of the coalescer 33 to discharge the separated sewage into the recycling tank for centralized treatment.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the technical solutions of the embodiments of this utility model.

Claims

1. A system for reducing degradation products in the working fluid of a hydrogen peroxide unit, characterized in that, The system includes a storage tank (1), the inlet of which is connected to a wastewater pipe, a stirring assembly (2) inside the storage tank (1), a drain pipe (11) and a waste discharge pipe (12) on the storage tank (1), wherein the drain pipe (11) extends to one side and is connected to a dehydration assembly (3), the bottom of the dehydration assembly (3) is connected to a clay bed (4) through a water supply pipe, and the outlet at the bottom of the clay bed (4) is connected to a hydrogenation reactor.

2. The system for reducing degradation products of the working fluid of a hydrogen peroxide unit according to claim 1, characterized in that, The stirring assembly (2) includes a root stirring shaft (22) vertically arranged at the center of the interior of the storage tank (1). The stirring shaft (22) is provided with stirring blades (23), and the upper and lower ends of the stirring shaft (22) are movably connected to the inner top and inner bottom surfaces of the storage tank (1) through ball bearings. The top of the storage tank (1) is also provided with a stirring motor (21) and is connected to the stirring shaft (22) for transmission.

3. The system for reducing degradation products of the working fluid of a hydrogen peroxide unit according to claim 2, characterized in that, The stirring shaft (22) and stirring blade (23) are hollow inside and have several spray holes on the outer side wall. The bottom end of the stirring shaft (22) extends downward to the outside of the liquid storage tank (1) and has a through hole on the end face. The inner side wall of the through hole is provided with a ball bearing and a gas supply pipe (24) is inserted. The gas supply pipe (24) extends outward and is connected to the air pump.

4. The system for reducing degradation products of the working fluid of a hydrogen peroxide unit according to claim 3, characterized in that, The dewatering component (3) includes a housing (31) with multiple mounting slots running through it. Each mounting slot (32) has a coalescer (33) fixed in it by flange bolts. The top and bottom of the coalescer (33) are respectively arranged with diversion pipes (34). One end of the diversion pipe (34) converges towards the center and is connected to the drain pipe (11). The other end of the diversion pipe (34) is distributed into several branch pipes and connected to multiple coalescers (33) one by one.

5. The system for reducing degradation products of the working fluid of a hydrogen peroxide unit according to claim 4, characterized in that, Each branch pipe on the diversion pipe (34) is equipped with a solenoid valve.

6. The system for reducing degradation products of the working fluid of a hydrogen peroxide unit according to claim 5, characterized in that, The bottom side of the coalescer (33) is also provided with a sewage pipe (35), the top surface of the sewage pipe (35) is connected to the bottom opening of the coalescer (33), and one end of the sewage pipe (35) faces outward and is connected to the recycling tank.

7. The system for reducing degradation products of the working fluid of a hydrogen peroxide unit according to claim 6, characterized in that, The surface of the liquid storage tank (1) is also provided with an observation window and a pH sensor.

8. The system for reducing degradation products of the working fluid of a hydrogen peroxide unit according to claim 7, characterized in that, The drain pipe (11) is also equipped with a flow pump (13).

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