Tubular catalytic wet oxidation device for treating fuel cell catalyst production wastewater
By adopting a tube-type catalytic wet oxidation device in the wastewater treatment of fuel cell catalyst production, preheating using waste heat recovery, and disassembling and assembly of the reaction tubes, the problems of high energy consumption and difficulty in control of the tower device are solved, and the continuous treatment of wastewater and the safety of the production process are improved.
Patent Information
- Application Number
- CN202421975719.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-15
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-08-15
AI Technical Summary
When the existing tower catalytic wet oxidation device treats wastewater from high concentration organic fuel cell catalyst production, it has high energy consumption, difficult control, catalyst wear and carbon deposits, resulting in plate shattering or blockage of the reactor, which poses safety hazards.
The column-type catalytic wet oxidation device is adopted to preheat the reaction mixture through waste heat recovery to reduce energy consumption; and the single reaction tube is disassembled and assembled through the column-type reactor to ensure the continuous treatment of wastewater, and optimize the temperature control in the reaction tube to reduce the difficulty of reactor control.
It achieves a reduction in energy consumption, ensures continuous treatment of wastewater, reduces the difficulty of reactor control, avoids the risk of flying temperature caused by reaction heat accumulation, and improves the safety of the production process.
Smart Images
Figure CN223033198U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of wastewater treatment, and particularly relates to a tubular catalytic wet oxidation device for treating wastewater from fuel cell catalyst production. Background Art
[0002] Currently, the treatment methods for high-concentration organic wastewater from fuel cell catalyst production (COD value ≥ 10,000 mg / L) at home and abroad generally rely on the "evaporation concentration + biochemical treatment" system. During the production process of fuel cell catalysts, alcohols, ketones, and nitrogen-containing organic compounds are usually used as reducing agents or synthetic liquid phase systems, such as DMF, oleylamine, etc. These substances are toxic, harmful, have a strong smell, and high viscosity. Some high-concentration heavy metal and rare precious metal ions among them will have a toxic effect on microorganisms, thus restricting means such as biochemical treatment, conventional aeration, and ozone catalytic oxidation. Moreover, a large amount of highly saline wastewater will inevitably be generated during the evaporation process, increasing the difficulty of subsequent treatment. In addition, there is also the method of electrochemical oxidation, but this process has serious problems of electrode corrosion and high energy consumption.
[0003] Since the above treatment methods are not ideal enough, in the actual production process, the treatment method of catalytic wet oxidation has gradually emerged. Catalytic wet oxidation has good treatment effects on organic wastewater with poor biodegradability and high concentration. The effluent can directly enter the biochemical treatment section for subsequent treatment, and it has been applied in scenarios such as the treatment of high-concentration landfill leachate, high-concentration printing and dyeing wastewater, and petrochemical waste alkali liquor. Its principle is that in a high-temperature and high-pressure environment, oxygen acts on the active components on the surface of the catalyst to generate extremely oxidizing free radical substances, which quickly oxidize organic substances into carbon dioxide or small-molecule carboxylic acids, thereby achieving the reduction of total organic carbon and the improvement of biodegradability.
[0004] However, most of the currently used tower-type catalytic wet oxidation devices are high-pressure special equipment with an integral structure. This equipment has a large volume itself. Coupled with the requirement for corrosion resistance, it is necessary to further increase the wall thickness and use titanium lining, resulting in a further increase in the volume of the reactor. When in use, large reactors not only consume a large amount of energy and are difficult to control, and strict reaction conditions need to be controlled; and since most of the catalysts are spherical catalysts, after being loaded into the reactor, as the use time increases, the surface of the spherical catalysts is prone to wear and carbon deposition, resulting in internal agglomeration or blockage of the reactor, causing the internal pressure of the reactor to rise, posing a great safety hazard. When it is necessary to load and unload the catalyst and perform equipment maintenance, the entire production needs to be stopped, which is not conducive to the continuous treatment of wastewater and affects normal production. Summary of the Utility Model
[0005] To solve or partially solve the problems existing in the related art, the present application provides a shell-and-tube catalytic wet oxidation device for treating the wastewater from the production of fuel cell catalysts. This device can preheat the reaction mixture through waste heat, reducing energy consumption; and by using a shell-and-tube reactor, it is possible to disassemble and assemble a single reaction tube during the production process to ensure continuous treatment of the wastewater.
[0006] The present application provides a shell-and-tube catalytic wet oxidation device for treating the wastewater from the production of fuel cell catalysts, which includes an organic wastewater storage tank, an air compressor, a gas-liquid mixing pipe, a preheating box, a bent pipe, a shell-and-tube reactor, a waste heat recovery pipe, and a liquid discharge storage tank. The organic wastewater storage tank and the air compressor are both connected to the gas-liquid mixing pipe for gas-liquid mixing. The outlet end of the gas-liquid mixing pipe is connected to the shell-and-tube reactor through the bent pipe. The bent pipe is arranged in the preheating box, and the outlet end of the shell-and-tube reactor is connected to the preheating box through the waste heat recovery pipe to preheat the bent pipe. The preheating box is connected to the liquid discharge storage tank through a liquid discharge pipe.
[0007] Optionally, in some embodiments, the shell-and-tube reactor is composed of multiple reaction tubes, and electric heating wires are wound around the outside of each reaction tube, and the reaction temperature can be controlled through the electric heating wires.
[0008] Optionally, in some embodiments, an outer shell is sleeved outside the reaction tube, and an inlet valve is installed at the inlet end of the reaction tube, and an outlet valve is installed at the outlet end thereof.
[0009] Optionally, in some embodiments, a first valve and a pressure pump are installed at the outlet of the organic wastewater storage tank.
[0010] Optionally, in some embodiments, the air compressor is connected to a compressed air tank, the compressed air tank is connected to the gas-liquid mixing pipe through a pipeline, and a second valve is installed at the outlet of the compressed air tank.
[0011] Optionally, in some embodiments, the outlet end of the shell-and-tube reactor is connected to a gas-liquid separator, and the gas-liquid separator is connected to the preheating box through a waste heat recovery pipe.
[0012] The technical solution provided by the present application may include the following beneficial effects:
[0013] The present application can recover waste heat through the preheating box and preheat the reaction mixture to be reacted, thereby reducing energy consumption; by using a shell-and-tube reactor, it is possible to disassemble and assemble a single reaction tube during the production process to ensure continuous treatment of the wastewater, and divide the gas-liquid mixed flow into multiple reactions, which can optimize the temperature control in the reaction tube, reduce the control difficulty of the reactor, prevent the risk of thermal runaway caused by the accumulation of reaction heat when the COD concentration of the wastewater is too high, and ensure the safety of the production process.
[0014] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory, and do not limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] By describing the exemplary embodiments of the present application in more detail in conjunction with the drawings, the above and other objects, features, and advantages of the present application will become more apparent. Among them, in the exemplary embodiments of the present application, the same reference numerals generally represent the same components.
[0016] Figure 1 is a schematic diagram of the overall structure of the present application;
[0017] Figure 2 is a partial structural cross-sectional view of the present application;
[0018] Figure 3 is a partial structural cross-sectional view of the present application.
[0019] Reference Numerals:
[0020] 1 - Organic wastewater storage tank, 2 - First valve, 3 - Pressurized pump, 4 - Air compressor, 5 - Compressed air tank, 6 - Second valve, 7 - Three-way pipe, 8 - Gas-liquid mixing pipe, 81 - Spiral fin, 9 - Connecting pipe, 10 - Elbow pipe, 11 - Preheating box, 12 - Liquid inlet main pipe, 13 - Liquid inlet branch pipe, 14 - Shell and tube reactor, 141 - Reaction tube, 142 - Electric heating wire, 143 - Outer shell, 144 - Inlet valve, 145 - Outlet valve, 15 - Liquid outlet branch pipe, 16 - Liquid outlet main pipe, 17 - Gas-liquid separator, 18 - Waste heat recovery pipe, 19 - Exhaust pipe, 20 - Drain pipe, 21 - Drainage storage tank. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0021] The embodiments of the present application will be described in more detail below with reference to the drawings. Although the embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.
[0022] It should be understood that although the terms "first", "second", "third", etc. may be used in the present application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more unless otherwise specifically defined.
[0023] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.
[0024] Unless otherwise clearly specified and defined, terms such as "installed", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.
[0025] In one embodiment, refer to Figure 1 , a tubular catalytic wet oxidation device for treating wastewater from fuel cell catalyst production, including an organic wastewater storage tank 1, an air compressor 4, a gas-liquid mixing pipe 8, a preheating box 11, a bent pipe 10, a tubular reactor 14, a waste heat recovery pipe 18, and a liquid discharge storage tank 21. The organic wastewater storage tank 1 and the air compressor 4 are both connected to the inlet end of a three-way pipe 7, and the outlet end of the three-way pipe 7 is connected to the inlet end of the gas-liquid mixing pipe 8. A spiral sheet 81 is fixedly arranged in the gas-liquid mixing pipe 8. When the organic wastewater is mixed with air and passes through the gas-liquid mixing pipe 8, it will be fully mixed under the action of the spiral sheet 81 to form a gas-liquid mixed flow; the outlet end of the gas-liquid mixing pipe 8 is connected to the liquid inlet main pipe 12 through the bent pipe 10, and the bent pipe 10 is fixedly arranged in the preheating box 11; a plurality of liquid inlet branch pipes 13 are connected to the liquid inlet main pipe 12, and the liquid inlet branch pipes 13 are connected to the inlet end of the tubular reactor 14. A cylindrical honeycomb ceramic catalyst is installed in the tubular reactor 14, and the diameter of the catalyst is slightly smaller than the pipe diameter to ensure that the incoming wastewater and air components are in full contact with the inside of the catalyst, and at the same time, it is convenient for loading and unloading. The catalysts should be tightly packed next to each other. The outlet end of the tubular reactor 14 is connected to a liquid outlet branch pipe 15, and each liquid outlet branch pipe 15 is communicated with a liquid outlet main pipe 16. The liquid outlet main pipe 16 is connected to a gas-liquid separator 17. The steam-water mixed flow is re-separated into gas and water through the gas-liquid separator 17. The gas is discharged from the exhaust pipe 19, and the liquid is connected back to the preheating box 11 through the waste heat recovery pipe 18 to preheat the bent pipe 10. The wastewater that has undergone heat exchange is discharged to the liquid discharge storage tank 21 through the drain pipe 20 at the bottom of the preheating box 11 for temporary storage, waiting for subsequent treatment.
[0026] In one embodiment, refer toFigure 3 The tubular reactor 14 is composed of multiple reaction tubes 141. Electric heating wires 142 are wound around the outer side of each reaction tube 141. The reaction temperature can be controlled through the electric heating wires 142. A housing 143 is sleeved outside the reaction tube 141. The housing 143 is made of heat-insulating material, which can reduce heat dissipation and protect the electric heating wires 142 at the same time. Further, for the convenience of disassembling and assembling a single reaction tube 141, both ends of the reaction tube 141 are respectively connected to the liquid inlet branch pipe 13 and the liquid outlet branch pipe 15 through quick-release flanges. And an inlet valve 144 is installed at the liquid inlet branch pipe 13, and an outlet valve 145 is installed at the liquid outlet branch pipe 15.
[0027] When it is necessary to disassemble the reaction tube 141, close the inlet valve 144 and the outlet valve 145 of the corresponding reaction tube 141, and then it can be disassembled, which is convenient and fast, and does not affect the normal use of other reaction tubes 141. Further, a detection device corresponding to each reaction tube 141 can be installed to separately monitor its temperature, pressure and water outlet condition, which is convenient for timely detecting abnormalities and ensuring the safety of the production process.
[0028] In one embodiment, refer to Figure 2 In the preheating box 11, a bent pipe 10 is fixedly arranged. Its top is communicated with the waste heat recovery pipe 18, and its bottom is connected to the liquid discharge storage tank 21 through a liquid discharge pipe 20. During use, the gas-liquid mixed flow to be treated passes through the bent pipe 10. The treated high-temperature waste water flows into the preheating box 11 from the waste heat recovery pipe 18 and exchanges heat with the gas-liquid mixed flow in the bent pipe 10, so as to be preheated.
[0029] In one embodiment, refer to Figure 1 At the outlet of the organic waste water storage tank 1, a first valve 2 and a pressure pump 3 are installed, so as to facilitate the control of the discharge of organic waste water; the air compressor 4 is connected to the compressed air tank 5, and a second valve 6 is installed at the outlet of the compressed air tank, so as to facilitate the control of the discharge of high-pressure air.
[0030] Specific working process:
[0031] The organic waste water and high-pressure air are fully mixed in the gas-liquid mixing pipe 8 to form a gas-liquid mixed flow. The gas-liquid mixed flow flows through the bent pipe 10, the liquid inlet main pipe 12, and the liquid inlet branch pipe 13 in sequence, and then enters the tubular reactor 14 for reaction treatment. The reaction temperature can be controlled through the electric heating wires 142. After the high-temperature mixed flow after the reaction passes through the gas-liquid separator 17 for separation, the high-temperature waste water flows into the preheating box 11 to preheat the gas-liquid mixed flow in the bent pipe 10. The waste water after heat exchange is finally discharged to the liquid discharge storage tank 21 for temporary storage, waiting for subsequent treatment.
[0032] Finally, it should also be noted that in this text, relationships such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "including", "comprising" or any other variant are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.
[0033] The embodiments of the present application have been described above. The above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The choice of terms used herein is intended to best explain the principles of the embodiments, the practical application or the improvement of the technology in the market, or to enable other ordinary skill in the art to understand the embodiments disclosed herein.
Claims
1. A tubular catalytic wet oxidation device for treating fuel cell catalyst production wastewater, characterized in that: The invention comprises an organic wastewater storage tank (1), an air compressor (4), a gas-liquid mixing pipe (8), a preheating box (11), a bend pipe (10), a tube-in-tube reactor (14), a waste heat recovery pipe (18), and a drainage storage tank (21). The organic wastewater storage tank (1) and the air compressor (4) are both connected to the gas-liquid mixing pipe (8) to mix gas and liquid. The outlet end of the gas-liquid mixing pipe (8) is connected to the tube-in-tube reactor (14) via a bend pipe (10). The bend pipe (10) is arranged in the preheating box (11), and the outlet end of the tube-in-tube reactor (14) is connected to the preheating box (11) via a waste heat recovery pipe (18), thereby preheating the bend pipe (10). The preheating box (11) is connected to the drainage storage tank (21) via a drainage pipe (20).
2. The tubular catalytic wet oxidation device for treating fuel cell catalyst production wastewater according to claim 1, characterized in that: The tubular reactor (14) is composed of a plurality of reaction tubes (141), and a heating wire (142) is wound around the outside of each reaction tube (141), and the reaction temperature can be controlled by the heating wire (142).
3. The tubular catalytic wet oxidation device for treating fuel cell catalyst production wastewater according to claim 2, characterized in that: The outer side of the reaction tube (141) is sleeved with a shell (143), and an inlet valve (144) is installed at the inlet end of the reaction tube (141), and an outlet valve (145) is installed at the outlet end.
4. The tubular catalytic wet oxidation device for treating fuel cell catalyst production wastewater according to claim 1, characterized in that: A first valve (2) and a pressure pump (3) are installed at the outlet of the organic wastewater storage tank (1).
5. The tubular catalytic wet oxidation device for treating fuel cell catalyst production wastewater according to claim 1, characterized in that: The air compressor (4) is connected to a compressed air tank (5), the compressed air tank (5) is connected to a gas-liquid mixing pipe (8) via a pipeline, and a second valve (6) is installed at the outlet of the compressed air tank (5).
6. The tubular catalytic wet oxidation device for treating fuel cell catalyst production wastewater according to claim 1, characterized in that: The outlet end of the tubular reactor (14) is connected to a gas-liquid separator (17), and the gas-liquid separator (17) is connected to a preheating box (11) via a waste heat recovery pipe (18).