Integrated system and method for kitchen waste gasification-hydro-thermal synthesis of copper powder

Abstract

The invention relates to the technical field of waste resource utilization, and discloses a kitchen waste gasification-hydro-thermal synthesis copper powder integrated system and method.In the system, a supercritical water gasification heating integrated unit, an oxidation module and a supercritical hydro-thermal synthesis module are sequentially arranged in a communicating mode; the output ends of the slurry output pipeline and the waterway preheating output unit are connected to the input end of the supercritical water gasification heating integrated unit; the output end of the supercritical water gasifying and heating integrated unit is connected with the deslagging unit; the output end of the liquid oxygen preheating output pipeline is connected to the input end of the oxidation module; the output end of the copper solution output pipeline is connected to the input end of the supercritical hydrothermal synthesis module; heat released by oxidation of the oxidation module is transferred to the critical hydrothermal synthesis module to reduce system energy loss, hydrogen-rich synthesis gas generated by gasification directly replaces a chemical reducing agent to reduce superfine copper powder, and the preparation quality of the copper powder is improved.

Description

Technical Field

[0001] The invention relates to the technical field of waste resource utilization, and in particular to an integrated system and method for gasification-hydrothermal synthesis of copper powder from kitchen waste. Background Art

[0002] Traditional methods of kitchen waste treatment, such as landfill, anaerobic digestion and incineration, have alleviated the problem of waste disposal to a certain extent, but they still have limitations such as low treatment efficiency and easy secondary pollution. Therefore, it is particularly important to explore an environmentally friendly, efficient and resource-based kitchen waste treatment method.

[0003] Supercritical water gasification technology provides a new idea to solve this problem. This technology allows water and food waste to react under conditions exceeding the critical point of water (374℃ and 22.1MPa), and uses the special properties of supercritical water, such as weakened hydrogen bond strength, high diffusion coefficient and strong ability to dissolve organic matter, to rapidly decompose and gasify the organic molecules in food waste, generating hydrogen-rich gas mainly composed of hydrogen and carbon dioxide, thus achieving effective transformation and resource utilization of waste. However, a major challenge faced by supercritical water gasification technology in practical applications is that it requires high temperature and pressure conditions. Traditional heating methods consume a lot of energy to achieve these conditions, which limits the widespread application and economic benefits of this technology.

[0004] On the other hand, as an important industrial material, ultrafine copper powder has broad application prospects in electronics, chemistry, medicine and other fields. Its unique physical, chemical and electrical properties, as well as high specific surface activity, make ultrafine copper powder an ideal choice for efficient catalysts, electronic materials, friction materials and lubricants. However, the current preparation methods of ultrafine copper powder often have problems such as high energy consumption and severe environmental pollution, which affect the quality and market competitiveness of the product. Summary of the invention

[0005] In order to overcome the defects of the above-mentioned prior art, the purpose of the present invention is to provide an integrated system and method for gasification-hydrothermal synthesis of copper powder from food waste, so as to solve the technical problem of how to effectively treat food waste and improve the quality of copper powder preparation in the prior art.

[0006] The present invention is achieved through the following technical solutions: In a first aspect, the present invention provides an integrated system for gasification-hydrothermal synthesis of copper powder from kitchen waste, comprising a slurry output pipeline, a water preheating output unit, a liquid oxygen preheating output pipeline, a copper solution output pipeline, a coupling reaction device, a slag discharge unit, a gas-liquid separation unit, and a solid-liquid separation unit; The coupled reaction device comprises a supercritical water gasification and heating integrated unit, an oxidation module and a supercritical hydrothermal synthesis module; the supercritical water gasification and heating integrated unit, the oxidation module and the supercritical hydrothermal synthesis module are sequentially connected and arranged; The output ends of the slurry output pipeline and the water preheating output unit are connected to the input end of the supercritical water gasification heating integrated unit; the output end of the supercritical water gasification heating integrated unit is connected to the slag discharge unit; The output end of the liquid oxygen preheating output pipeline is connected to the input end of the oxidation module; The input end of the copper solution output pipeline is used to input a copper precursor solution and a modifier, and the output end of the copper solution output pipeline is connected to the input end of a supercritical hydrothermal synthesis module; the supercritical hydrothermal synthesis module is provided with two groups of output ends, one group of which is connected to a gas-liquid separation unit; and the other group of output ends is connected to a solid-liquid separation unit.

[0007] Preferably, a slurry pump is provided on the input end of the slurry output pipeline, which is used to pump the kitchen waste slurry through the slurry output pipeline into the supercritical water gasification heating integrated unit via the slurry pump.

[0008] Preferably, the water circuit preheating output unit comprises a water circuit output pipeline and a first solar heater; The output end of the water output pipeline is connected to the supercritical water gasification heating integrated unit after passing through the first solar heater; the input end of the water output pipeline is provided with a water pump, which is used to pump water through the water output pipeline through the first solar heater into the supercritical water gasification heating integrated unit.

[0009] Preferably, the supercritical water vaporization heating integrated unit comprises a supercritical water vaporization module and a second solar heater; The second solar heater is arranged on the outer side wall of the supercritical water gasification module, and the supercritical water gasification module, the oxidation module and the supercritical water thermal synthesis module are sequentially connected and arranged; The output ends of the slurry output pipeline and the water preheating output unit are connected to the input end of the supercritical water gasification module; and the slag discharge unit is connected to the output end of the supercritical water gasification module.

[0010] Preferably, the slag discharge unit comprises a first cooler and a lock hopper; The input end of the first cooler is connected to the output end of the supercritical water gasification heating integrated unit; the output end of the first cooler is connected to the input end of the lock hopper; the lock hopper is also provided with a water injection pipeline and a slag discharge pipeline; the water injection pipeline is provided with a water injection ball valve, and the slag discharge pipeline is provided with a slag discharge needle valve.

[0011] Preferably, a liquid oxygen pump and an air preheater are provided in sequence on the liquid oxygen preheating output pipeline in the direction from the input end to the output end, for pumping the liquid oxygen into the oxidation module through the liquid oxygen pump and preheating the liquid oxygen through the air preheater at the same time.

[0012] Preferably, the copper solution output pipeline includes a copper precursor solution output pipeline and a modifier output pipeline; The input end of the copper precursor solution output pipeline is provided with a copper precursor solution pump for inputting the copper precursor solution; the input end of the modifier output pipeline is provided with a modifier pump for inputting the modifier; The output ends of the copper precursor solution output pipeline and the modifier output pipeline are respectively connected to the input end of the supercritical hydrothermal synthesis module.

[0013] Preferably, the gas-liquid separation unit comprises a second cooler, a gas-liquid separator and a water tank; The input end of the second cooler is connected to a group of output ends of the supercritical hydrothermal synthesis module, the output end of the second cooler is connected to the input end of the gas-liquid separator, and the liquid output end of the gas-liquid separator is connected to the water tank.

[0014] Preferably, the solid-liquid separation unit comprises a third cooler and a solid-liquid separator; The input end of the third cooler is connected to another group of output ends of the supercritical hydrothermal synthesis module, and the output end of the third cooler is connected to the solid-liquid separator.

[0015] A method for using an integrated system for gasification-hydrothermal synthesis of copper powder from kitchen waste, based on the above-mentioned integrated system for gasification-hydrothermal synthesis of copper powder from kitchen waste, comprises the following steps: The kitchen waste slurry enters the supercritical water gasification heating integrated unit through the slurry output pipeline, and at the same time, the water is heated through the water preheating output unit and then enters the supercritical water gasification heating integrated unit; In the supercritical water gasification heating integrated unit, water and food waste slurry are heated and then gasified to obtain gasification products. After the gasification products are separated by ash as reactants and heat sources, part of the gasification products flows into the oxidation module, and the other part of the gasification products is discharged through the slag discharge unit for slag treatment; Liquid oxygen is heated through a liquid oxygen preheating output pipeline and then enters the oxidation module, and undergoes an oxidation reaction with the gasification product entering the oxidation module to obtain an oxidation product, the oxidation product being used to provide heat for the supercritical hydrothermal synthesis module, and at the same time, the liquid oxygen and the remaining gasification product flow into the supercritical hydrothermal synthesis module as a heat source and a reducing agent. At the same time, a copper precursor solution and a modifier are input into the supercritical hydrothermal synthesis module through a copper solution output pipeline, and undergo a reduction reaction with the oxidation product and the remaining gasification product to obtain a product, and the product is passed through a solid-liquid separation unit to obtain copper powder; at the same time, the remaining oxidation product is separated into water and gas through a gas-liquid separation unit in the supercritical hydrothermal synthesis module.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention provides an integrated system for gasification-hydrothermal synthesis of copper powder from kitchen waste, which directly connects a supercritical water gasification module, an oxidation module and a supercritical hydrothermal synthesis module, transfers heat and reaction products by direct mass transfer, and effectively improves the treatment efficiency of kitchen waste. An oxidation module is arranged in front of the supercritical hydrothermal synthesis module, and oxidation exothermicity provides heat for supercritical hydrothermal synthesis, thereby reducing energy input. After the oxidation reaction, the optimized product and the remaining hydrogen-rich synthesis gas are directly involved in the supercritical hydrothermal synthesis reaction as a heat source and a reducing agent, and the ultrafine copper powder is reduced, thereby avoiding the use of chemical reagents. The present invention transfers heat to the supercritical hydrothermal synthesis module through the oxidation module, thereby increasing the reaction temperature. Direct mass transfer and heat transfer reduce system energy loss, accelerate the reaction rate, and improve the energy efficiency of the system. The hydrogen-rich synthesis gas generated by gasification directly replaces the chemical reducing agent to reduce the ultrafine copper powder, thereby realizing the efficient, clean, and low-cost preparation of the ultrafine copper powder, and improving the quality of the copper powder preparation.

[0017] Furthermore, by providing a slurry pump, the amount of food waste slurry delivered can be flexibly adjusted. According to actual needs, the delivery speed and pressure of the slurry pump can be adjusted to meet different processing scales and needs.

[0018] Furthermore, the first solar heater can make full use of solar energy resources to preheat water, which helps to reduce dependence on traditional energy, reduce energy consumption and environmental pollution. Through solar preheating, the initial temperature of water entering the supercritical water vaporization heating integrated unit can be significantly increased, thereby reducing the energy required for subsequent heating and improving the energy efficiency of the entire system. The setting of the water pump can ensure the stable flow of water in the water output pipeline, and at the same time can adjust the water flow and pressure according to actual needs, thereby achieving energy saving and consumption reduction.

[0019] Furthermore, the second solar heater is arranged on the outer side wall of the supercritical water gasification module, and solar energy can be used to preheat or auxiliary heat the supercritical water gasification module, which can not only reduce the dependence on traditional energy, but also reduce the operation cost.

[0020] Furthermore, the input end of the first cooler is connected to the output end of the supercritical water gasification heating integrated unit, which can quickly cool the high-temperature and high-pressure reaction products to facilitate subsequent slag discharge and processing. The lock hopper serves as a temporary storage container for the residue, which can buffer the pressure difference and flow fluctuation between the first cooler and the slag discharge pipeline. The water injection pipeline is provided with a water injection ball valve, which can control the amount of water injected into the lock hopper, which helps to lower the temperature of the residue, making it easier to discharge, and reducing the wear and blockage of the residue on the equipment. The slag discharge pipeline is provided with a slag discharge needle valve, which can accurately control the discharge amount of the residue.

[0021] Furthermore, the liquid oxygen pump can efficiently pump liquid oxygen from the input end to the oxidation module to ensure a stable supply of liquid oxygen. The air preheater can preheat the liquid oxygen by absorbing heat from the air to increase the temperature of the liquid oxygen. The preheated liquid oxygen is more likely to react with the fuel in the oxidation module, thereby increasing the reaction rate and efficiency.

[0022] Furthermore, the copper precursor solution pump and the modifier pump can accurately control the delivery volume and flow rate of each solution, ensuring that the copper precursor solution and the modifier enter the supercritical hydrothermal synthesis module at an appropriate ratio and flow rate. Through the continuous operation of the pump, the stable supply of the copper precursor solution and the modifier during the reaction can be ensured, avoiding reaction failure or product quality degradation caused by insufficient or interrupted solution supply.

[0023] Furthermore, the second cooler can quickly cool the high-temperature and high-pressure gas-liquid mixture output by the supercritical hydrothermal synthesis module to an appropriate temperature range; the cooling process helps to reduce the pressure and temperature of the gas-liquid mixture, making it easier to perform subsequent separation operations. The gas-liquid separator effectively separates the cooled gas-liquid mixture into gas and liquid, ensuring the purity and quality of the product while reducing the complexity and cost of subsequent processing.

[0024] Furthermore, the third cooler can receive the high-temperature and high-pressure solid-liquid mixture output by the supercritical hydrothermal synthesis module and quickly cool it to a suitable temperature range; the solid-liquid separator effectively separates the cooled solid-liquid mixture into copper powder and liquid, ensuring the purity and quality of the separated copper powder and avoiding mutual contamination of solid and liquid components.

[0025] The present invention also provides a method for using an integrated system for gasification-hydrothermal synthesis of copper powder from kitchen waste, which converts kitchen waste into valuable copper powder and other products, thereby realizing resource utilization of kitchen waste. The gasification product is fully utilized in the system as a reducing agent. The oxidation product is used as a heat source to further improve the heating efficiency of supercritical hydrothermal synthesis. In the supercritical water gasification heating integrated unit, the kitchen waste slurry and water are heated to a supercritical state and undergo a gasification reaction. The gasification product then enters an oxidation module for an oxidation reaction to generate an oxidation product, which helps to promote the supercritical hydrothermal synthesis reaction. The remaining gasification product undergoes a reduction reaction with a copper precursor solution and a modifier in a supercritical hydrothermal synthesis module to generate copper powder, thereby realizing efficient, clean, and low-cost preparation of ultrafine copper powder and improving the quality of copper powder preparation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a first structural schematic diagram of an integrated system for gasification-hydrothermal synthesis of copper powder from kitchen waste in Example 1 of the present invention; Figure 2 This is a second structural schematic diagram of the integrated system for gasification-hydrothermal synthesis of copper powder from kitchen waste in Example 1 of the present invention; Figure 3 This is a first structural schematic diagram of an integrated system for gasification-hydrothermal synthesis of copper powder from kitchen waste in Example 2 of the present invention; Figure 4 This is a second structural schematic diagram of the integrated system for gasification-hydrothermal synthesis of copper powder from kitchen waste in Example 2 of the present invention; In the figure: 1. slurry pump; 2. water pump; 3. first solar heater; 4. liquid oxygen pump; 5. air preheater; 6. copper precursor solution pump; 7. modifier pump; 8. coupling reaction device; 9. supercritical water gasification module; 10. oxidation module; 11. supercritical hydrothermal synthesis module; 12. second solar heater; 13. first cooler; 14. lock hopper; 15. second cooler; 16. gas-liquid separator; 17. water tank; 18. third cooler; 19. solid-liquid separator; 20. heat generator. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0028] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0029] The purpose of the present invention is to provide an integrated system and method for gasification-hydrothermal synthesis of copper powder from kitchen waste, so as to solve the technical problem of how to effectively treat kitchen waste and improve the quality of copper powder preparation in the prior art.

[0030] The present invention is further described in detail below in conjunction with the accompanying drawings: Example 1 See also Figure 1 In one embodiment of the present invention, an integrated system for gasification-hydrothermal synthesis of copper powder by kitchen waste is provided, comprising a slurry output pipeline, a water preheating output unit, a liquid oxygen preheating output pipeline, a copper solution output pipeline, a coupling reaction device 8, a slag removal unit, a gas-liquid separation unit and a solid-liquid separation unit; the coupling reaction device 8 comprises a supercritical water gasification heating integrated unit, an oxidation module 10 and a supercritical hydrothermal synthesis module 11; the supercritical water gasification heating integrated unit, the oxidation module 10 and the supercritical hydrothermal synthesis module 11 are sequentially connected; the slurry output pipeline and the water preheating output unit are connected to each other ...lag preheating output unit and the liquid preheating output unit are connected to each other; the slurry output pipeline and the water preheating output unit are connected to each other; the slag preheating output unit and the liquid preheating output unit are connected to each other; the slurry output pipeline and the water preheating output unit are connected to each other; the slag preheating output unit and the liquid preheating output unit are connected to each other; the slurry output pipeline and The output end of the preheating output unit is connected to the input end of the supercritical water gasification heating integrated unit; the output end of the supercritical water gasification heating integrated unit is connected to the slag removal unit; the output end of the liquid oxygen preheating output pipeline is connected to the input end of the oxidation module 10; the input end of the copper solution output pipeline is used to input the copper precursor solution and the modifier, and the output end of the copper solution output pipeline is connected to the input end of the supercritical hydrothermal synthesis module 11; the supercritical hydrothermal synthesis module 11 is provided with two groups of output ends, one group of output ends is connected to the gas-liquid separation unit; the other group of output ends is connected to the solid-liquid separation unit.

[0031] Specifically, a slurry pump 1 is provided on the input end of the slurry output pipeline, which is used to pump the kitchen waste slurry through the slurry output pipeline via the slurry pump 1 into the supercritical water gasification heating integrated unit.

[0032] In this embodiment, the slurry pump 1 is used as a power source to pump the kitchen waste slurry from the input end into the slurry output pipeline. Its high pressure output capacity ensures that the slurry can smoothly overcome the pipeline resistance and enter the supercritical water gasification heating integrated unit.

[0033] Specifically, the water preheating output unit includes a water output pipeline and a first solar heater 3; the output end of the water output pipeline is connected to the supercritical water vaporization heating integrated unit after passing through the first solar heater 3; the input end of the water output pipeline is provided with a water pump 2, which is used to pump water through the water output pipeline through the first solar heater 3 into the supercritical water vaporization heating integrated unit.

[0034] In this embodiment, the first solar heater 3 uses the radiation energy of sunlight to heat water and increase the temperature of the water so that the heat energy can be more effectively used in the subsequent supercritical water gasification process. The water pump 2 is used as a power source to suck water from the water source and transport it to the first solar heater 3 through the water output pipeline.

[0035] Specifically, the supercritical water gasification and heating integrated unit includes a supercritical water gasification module 9 and a second solar heater 12; the second solar heater 12 is arranged on the outer wall of the supercritical water gasification module 9, and the supercritical water gasification module 9, the oxidation module 10 and the supercritical hydrothermal synthesis module 11 are connected in sequence; the output ends of the slurry output pipeline and the water preheating output unit are connected to the input end of the supercritical water gasification module 9; the slag discharge unit is connected to the output end of the supercritical water gasification module 9.

[0036] In this embodiment, the second solar heater 12 is arranged on the outer wall of the supercritical water gasification module 9, and the radiation energy of sunlight is used to further increase the temperature in the module, which helps to accelerate the gasification reaction and improve the reaction efficiency. The supercritical water gasification module 9 is the core part of the whole system, which is responsible for gasifying the input water and kitchen waste slurry under supercritical conditions.

[0037] Specifically, the slag discharge unit includes a first cooler 13 and a lock hopper 14; the input end of the first cooler 13 is connected to the output end of the supercritical water gasification heating integrated unit; the output end of the first cooler 13 is connected to the input end of the lock hopper 14; the lock hopper 14 is also provided with a water injection pipeline and a slag discharge pipeline; the water injection pipeline is provided with a water injection ball valve, and the slag discharge pipeline is provided with a slag discharge needle valve.

[0038] In this embodiment, the first cooler 13 receives the high-temperature gas or liquid residue output by the supercritical water gasification heating integrated unit and performs cooling treatment. By cooling, the temperature of the residue can be reduced to a safe range, which is convenient for subsequent treatment. The lock hopper 14 is connected to the output end of the first cooler 13 and is responsible for receiving the cooled residue. The lock hopper 14 has the function of storing and temporarily locking the residue to ensure that the residue is properly handled before discharge. The water injection pipeline is arranged on the lock hopper 14, which is used to inject water or other cooling medium into the lock hopper 14. Water injection helps to further cool the residue and prevent the residue from clogging or damaging the equipment during the discharge process. The slag discharge pipeline is responsible for discharging the residue in the lock hopper 14 to an external processing device or storage container. A valve is usually provided on the slag discharge pipeline to control the discharge speed and discharge time of the residue. The water injection ball valve and the slag discharge needle valve are respectively arranged on the water injection pipeline and the slag discharge pipeline to control the flow of the medium. The water injection ball valve is used to open or close the water injection pipeline, and the slag discharge needle valve is used to accurately control the slag discharge speed and discharge time.

[0039] Specifically, a liquid oxygen pump 4 and an air preheater 5 are provided in sequence on the liquid oxygen preheating output pipeline from the input end to the output end, so as to pump the liquid oxygen into the oxidation module 10 through the liquid oxygen pump 4 and preheat the liquid oxygen through the air preheater 5 at the same time.

[0040] In this embodiment, the liquid oxygen pump 4 is responsible for pumping liquid oxygen from the input end to the oxidation module 10. The air preheater 5 is usually used to recover heat and increase the temperature of the air entering the oxidation module 10.

[0041] Specifically, the copper solution output pipeline includes a copper precursor solution output pipeline and a modifier output pipeline; the input end of the copper precursor solution output pipeline is provided with a copper precursor solution pump 6 for inputting the copper precursor solution; the input end of the modifier output pipeline is provided with a modifier pump 7 for inputting the modifier; the output ends of the copper precursor solution output pipeline and the modifier output pipeline are respectively connected to the input end of the supercritical hydrothermal synthesis module 11.

[0042] In this embodiment, the copper precursor solution pump 6 and the modifier pump 7 are provided to realize the automatic delivery of the copper precursor solution and the modifier, thereby avoiding the tediousness and errors of manual operation and improving production efficiency.

[0043] Specifically, the gas-liquid separation unit includes a second cooler 15, a gas-liquid separator 16 and a water tank 17; the input end of the second cooler 15 is connected to a group of output ends of the supercritical hydrothermal synthesis module 11, the output end of the second cooler 15 is connected to the input end of the gas-liquid separator 16, and the liquid output end of the gas-liquid separator 16 is connected to the water tank 17.

[0044] In this embodiment, the second cooler 15 can receive the high-temperature fluid output from the supercritical hydrothermal synthesis module 11 and cool it to a suitable temperature range. This helps to stabilize the overall temperature of the system and prevent equipment damage or safety hazards caused by excessive temperature. The function of the gas-liquid separator 16 is to effectively separate the gas and liquid in the cooled fluid. This ensures that the water tank 17 receives only liquid substances, avoiding operational problems or safety hazards that may be caused by gas mixing.

[0045] Specifically, the solid-liquid separation unit includes a third cooler 18 and a solid-liquid separator 19 ; the input end of the third cooler 18 is connected to another set of output ends of the supercritical hydrothermal synthesis module 11 , and the output end of the third cooler 18 is connected to the solid-liquid separator 19 .

[0046] In this embodiment, the third cooler 18 can effectively receive and cool the high-temperature fluid output from the supercritical hydrothermal synthesis module 11. By lowering the temperature of the fluid, it can be easier to separate the solid and liquid, thereby improving the separation efficiency. The solid-liquid separator 19 can effectively separate the solid and liquid in the cooled fluid. This separation not only improves the purity of the copper powder, but also reduces the complexity of subsequent processing.

[0047] In this embodiment, the supercritical water gasification heating integrated unit, the oxidation module 10 and the supercritical water thermal synthesis module 11 are sequentially connected and arranged, and baffles may be arranged between them, and a connecting hole is arranged between each baffle, such as Figure 1 shown.

[0048] In this embodiment, a heat generator 20 may be provided between the supercritical water thermal synthesis module 11 and the gas-liquid separation unit, and waste heat recovery by the heat generator 20 obtains additional heat energy and provides heat energy to the outside world. Figure 2 shown.

[0049] Example 2 according to Figure 3 As shown, in one embodiment of the present invention, an integrated system for gasification-hydrothermal synthesis of copper powder from kitchen waste is provided. Based on the system structure of embodiment 1, in embodiment 2, the supercritical water gasification and heating integrated unit, the oxidation module 10 and the supercritical hydrothermal synthesis module 11 are sequentially connected and arranged, and there is no need to set a baffle between them, and the reaction product can directly enter the next reaction stage. The required lengths of the gasification section, the oxidation section and the hydrothermal synthesis section can be calculated respectively by dynamics.

[0050] In this embodiment, the gasification product can flow directly to the oxidation stage, and the oxidation stage releases heat through oxidation, which is directly transferred to the supercritical hydrothermal synthesis module 11 through the oxidation product to increase the reaction temperature. In addition, the remaining hydrogen-rich gas after oxidation can directly enter the hydrothermal synthesis module to replace the chemical reducing agent for reduction to prepare ultrafine copper powder.

[0051] In this embodiment, a heat generator 20 may be provided between the supercritical water thermal synthesis module 11 and the gas-liquid separation unit, and waste heat recovery by the heat generator 20 obtains additional heat energy and provides heat energy to the outside world. Figure 4 shown.

[0052] In summary, the present invention provides an integrated system for gasification-hydrothermal synthesis of kitchen waste copper powder, which directly connects the supercritical water gasification module 9, the oxidation module 10 and the supercritical hydrothermal synthesis module 11 together, and transfers heat and reaction products by direct mass transfer, thereby effectively improving the efficiency of kitchen waste treatment. The oxidation module 10 is arranged in front of the supercritical hydrothermal synthesis module 11, and the oxidation heat release provides heat for the supercritical hydrothermal synthesis, thereby reducing energy input. After the oxidation reaction, the optimized product and the remaining hydrogen-rich synthesis gas are directly involved in the supercritical hydrothermal synthesis reaction as a heat source and a reducing agent, and the ultrafine copper powder is reduced, thereby avoiding the use of chemical reagents. The present invention oxidizes and releases heat through the oxidation module 10, and transfers it to the supercritical hydrothermal synthesis module through direct mass transfer and heat transfer, thereby increasing the reaction temperature. Direct mass transfer and heat transfer reduces system energy loss, accelerates the reaction rate, and improves the energy efficiency of the system. The hydrogen-rich synthesis gas generated by gasification directly replaces the chemical reducing agent to reduce the ultrafine copper powder, thereby realizing the efficient, clean, and low-cost preparation of the ultrafine copper powder, and improving the quality of the copper powder preparation.

[0053] Example 3 In one embodiment of the present invention, a method for using an integrated system for gasification-hydrothermal synthesis of copper powder from kitchen waste is provided. Based on the above-mentioned integrated system for gasification-hydrothermal synthesis of copper powder from kitchen waste, the method comprises the following steps: The kitchen waste slurry is driven by the slurry pump 1 through the slurry output pipeline to enter the supercritical water gasification module 9, while the water is pumped by the water pump 2 through the water output pipeline and then heated by the first solar heater 3 to enter the supercritical water gasification module 9; The second solar heater 12 heats the water and the kitchen waste slurry in the supercritical water gasification module 9 to perform a gasification reaction to obtain a gasification product. After the gasification product is separated from the ash as a reactant and a heat source, a portion of the gasification product flows into the oxidation module 10, and the other portion of the gasification product passes through the first cooler 13 and enters the lock hopper 14 for slag discharge. After being driven by the liquid oxygen pump 4, the liquid oxygen is heated in the air preheater 5 through the liquid oxygen preheating output pipeline and then enters the oxidation module 10, and undergoes an oxidation reaction with the gasification product entering the oxidation module 10 to obtain an oxidation product, the oxidation product being used to provide heat for the supercritical hydrothermal synthesis module 11, and at the same time, it flows into the supercritical hydrothermal synthesis module 11 with the remaining gasification product as a heat source and a reducing agent, and at the same time, the copper precursor solution and the modifier are driven by the copper precursor solution pump 6 and the modifier pump 7 respectively through the copper precursor solution output pipeline and the modifier output pipeline and input into the supercritical hydrothermal synthesis module 11, and undergo a reduction reaction with the oxidation product and the remaining gasification product to obtain a product, and the product is separated by passing through the third cooler 18 and then through the solid-liquid separator 19 to obtain copper powder; at the same time, the remaining oxidation product is separated by passing through the second cooler 15 and then through the gas-liquid separator 16 in the supercritical hydrothermal synthesis module 11 to obtain water and gas.

[0054] In summary, the method for using the integrated system of kitchen waste gasification-hydrothermal synthesis of copper powder provided in this embodiment converts kitchen waste into valuable copper powder and other products, thereby realizing the resource utilization of kitchen waste. The gasification product is fully utilized in the system as a reducing agent. The oxidation product is used as a heat source to further improve the heating efficiency of supercritical hydrothermal synthesis. In the supercritical water gasification heating integrated unit, the kitchen waste slurry and water are heated to a supercritical state and undergo a gasification reaction. The gasification product then enters the oxidation module 10 for an oxidation reaction to generate an oxidation product, which helps to promote the supercritical hydrothermal synthesis reaction. The remaining gasification product undergoes a reduction reaction with the copper precursor solution and the modifier in the supercritical hydrothermal synthesis module 11 to generate copper powder, thereby realizing the efficient, clean, and low-cost preparation of ultrafine copper powder and improving the quality of copper powder preparation.

[0055] In the present invention, the oxidation module 10 releases heat during oxidation, and directly transfers heat to the supercritical hydrothermal synthesis module 11 through mass transfer, thereby reducing costs, reducing the time for the reaction to reach the target temperature, and improving the energy efficiency of the system. The present invention can also convert food waste into hydrogen-rich synthesis gas, thereby realizing the conversion of waste into resources. The present invention replaces traditional heaters with solar heaters, thereby reducing energy input and being more environmentally friendly. At the same time, the present invention can also recover waste heat for heating, so that the system can harvest additional heat energy on the basis of processing food waste and obtaining high-purity ultrafine copper powder, thereby improving economic benefits.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An integrated system for gasification and hydrothermal synthesis of copper powder from kitchen waste, characterized in that: It includes a slurry output pipeline, a water preheating output unit, a liquid oxygen preheating output pipeline, a copper solution output pipeline, a coupling reaction device (8), a slag discharge unit, a gas-liquid separation unit and a solid-liquid separation unit; The coupled reaction device (8) comprises a supercritical water gasification and heating integrated unit, an oxidation module (10) and a supercritical hydrothermal synthesis module (11); the supercritical water gasification and heating integrated unit, the oxidation module (10) and the supercritical hydrothermal synthesis module (11) are sequentially connected; The output ends of the slurry output pipeline and the water preheating output unit are connected to the input end of the supercritical water gasification heating integrated unit; the output end of the supercritical water gasification heating integrated unit is connected to the slag discharge unit; The output end of the liquid oxygen preheating output pipeline is connected to the input end of the oxidation module (10); The input end of the copper solution output pipeline is used to input a copper precursor solution and a modifier, and the output end of the copper solution output pipeline is connected to the input end of a supercritical hydrothermal synthesis module (11); the supercritical hydrothermal synthesis module (11) is provided with two groups of output ends, one group of which is connected to a gas-liquid separation unit; and the other group of which is connected to a solid-liquid separation unit.

2. The integrated system for gasification and hydrothermal synthesis of copper powder from kitchen waste according to claim 1, characterized in that: A slurry pump (1) is provided at the input end of the slurry output pipeline, and is used to pump the kitchen waste slurry through the slurry output pipeline via the slurry pump (1) into the supercritical water gasification heating integrated unit.

3. The integrated system for kitchen waste gasification-hydrothermal synthesis of copper powder according to claim 1, characterized in that: The water circuit preheating output unit comprises a water circuit output pipeline and a first solar heater (3); The output end of the water output pipeline is connected to the supercritical water vaporization heating integrated unit after passing through the first solar heater (3); the input end of the water output pipeline is provided with a water pump (2) for pumping water through the water output pipeline through the first solar heater (3) into the supercritical water vaporization heating integrated unit.

4. The integrated system for kitchen waste gasification-hydrothermal synthesis of copper powder according to claim 1, characterized in that: The supercritical water gasification heating integrated unit comprises a supercritical water gasification module (9) and a second solar heater (12); The second solar heater (12) is arranged on the outer wall of the supercritical water gasification module (9), and the supercritical water gasification module (9), the oxidation module (10) and the supercritical water thermal synthesis module (11) are sequentially connected; The output ends of the slurry output pipeline and the water preheating output unit are connected to the input end of the supercritical water gasification module (9); and the slag discharge unit is connected to the output end of the supercritical water gasification module (9).

5. The integrated system for gasification-hydrothermal synthesis of copper powder from kitchen waste according to claim 1, characterized in that: The slag discharge unit comprises a first cooler (13) and a lock hopper (14); The input end of the first cooler (13) is connected to the output end of the supercritical water gasification heating integrated unit; the output end of the first cooler (13) is connected to the input end of the lock hopper (14); the lock hopper (14) is also provided with a water injection pipeline and a slag discharge pipeline; the water injection pipeline is provided with a water injection ball valve, and the slag discharge pipeline is provided with a slag discharge needle valve.

6. The integrated system for gasification-hydrothermal synthesis of copper powder from kitchen waste according to claim 1, characterized in that: A liquid oxygen pump (4) and an air preheater (5) are provided in sequence on the liquid oxygen preheating output pipeline in a direction from the input end to the output end, and are used to pump the liquid oxygen into the oxidation module (10) through the liquid oxygen pump (4) and preheat the liquid oxygen through the air preheater (5) at the same time.

7. The integrated system for gasification-hydrothermal synthesis of copper powder from kitchen waste according to claim 1, characterized in that: The copper solution output pipeline includes a copper precursor solution output pipeline and a modifier output pipeline; The input end of the copper precursor solution output pipeline is provided with a copper precursor solution pump (6) for inputting the copper precursor solution; the input end of the modifier output pipeline is provided with a modifier pump (7) for inputting the modifier; The output ends of the copper precursor solution output pipeline and the modifier output pipeline are respectively connected to the input end of the supercritical hydrothermal synthesis module (11).

8. The integrated system for gasification-hydrothermal synthesis of copper powder from kitchen waste according to claim 1, characterized in that: The gas-liquid separation unit comprises a second cooler (15), a gas-liquid separator (16) and a water tank (17); The input end of the second cooler (15) is connected to a group of output ends of the supercritical hydrothermal synthesis module (11), the output end of the second cooler (15) is connected to the input end of the gas-liquid separator (16), and the liquid output end of the gas-liquid separator (16) is connected to the water tank (17).

9. The integrated system for gasification-hydrothermal synthesis of copper powder from kitchen waste according to claim 1, characterized in that: The solid-liquid separation unit comprises a third cooler (18) and a solid-liquid separator (19); The input end of the third cooler (18) is connected to another group of output ends of the supercritical hydrothermal synthesis module (11), and the output end of the third cooler (18) is connected to the solid-liquid separator (19).

10. A method for using an integrated system for gasification and hydrothermal synthesis of copper powder from kitchen waste, characterized in that: An integrated system for gasification-hydrothermal synthesis of copper powder from kitchen waste according to any one of claims 1 to 9 comprises the following steps: The kitchen waste slurry enters the supercritical water gasification heating integrated unit through the slurry output pipeline, and at the same time, the water is heated through the water preheating output unit and then enters the supercritical water gasification heating integrated unit; In a supercritical water gasification and heating integrated unit, water and food waste slurry are heated and then subjected to a gasification reaction to obtain a gasification product. The gasification product is used as a reactant and a heat source, and after ash separation, a portion of the gasification product flows into an oxidation module (10), and another portion of the gasification product is subjected to slag discharge treatment through a slag discharge unit; Liquid oxygen is heated through a liquid oxygen preheating output pipeline and then enters the oxidation module (10), and undergoes an oxidation reaction with the gasification product entering the oxidation module (10) to obtain an oxidation product, the oxidation product being used to provide heat for the supercritical hydrothermal synthesis module (11), and at the same time, the oxidation product and the remaining gasification product flow into the supercritical hydrothermal synthesis module (11) as a heat source and a reducing agent. At the same time, a copper precursor solution and a modifier are input into the supercritical hydrothermal synthesis module (11) through a copper solution output pipeline, and undergo a reduction reaction with the oxidation product and the remaining gasification product to obtain a product, and the product is passed through a solid-liquid separation unit to obtain copper powder; at the same time, the remaining oxidation product is separated into water and gas through a gas-liquid separation unit in the supercritical hydrothermal synthesis module (11).

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