An integrated kitchen waste gasification-hydrothermal synthesis multi-fusion system and method

Abstract

The invention relates to the technical field of waste resource utilization, and discloses an integrated kitchen waste gasification-hydrothermal synthesis multi-fusion system and method. The system comprises a water output pipeline, a slurry output pipeline, a liquid oxygen output pipeline, a coupling reaction device, a copper solution output pipeline, a copper powder separation unit, a hydrogen separation unit and a slag discharge unit; the coupling reaction device comprises a supercritical water gasification module, an oxidation module and a supercritical hydrothermal synthesis module which are sequentially arranged from the outside to the inside, and a connection arrangement between the supercritical water gasification module, the oxidation module and the supercritical hydrothermal synthesis module; the output ends of the water output pipeline and the slurry output pipeline are connected to the input end of the supercritical water gasification module; the output end of the supercritical water gasification module is connected to the slag discharge unit. The invention can optimize the reaction sequence by adjusting the internal structure of the coupling reaction device, so as to better meet different production needs.

Description

Technical Field

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

[0002] If the nutrient-rich food waste is discharged directly without treatment, harmful substances will be produced during the decomposition process, further polluting the environment. Food waste contains a large amount of organic components, such as carbohydrates, proteins and fats, which are easy to produce unpleasant odors during the decomposition process and provide a breeding ground for bacteria, thereby aggravating environmental pollution. If these wastes are not handled in a timely and effective manner, it will not only pose a serious threat to the ecological environment, but also pose a potential risk to public health. At present, the main methods for treating food waste are anaerobic digestion, pyrolysis incineration, landfill and composting. Although anaerobic digestion can degrade organic matter in food waste and avoid the occurrence of health and safety problems. However, it occupies too much area, the fermentation time is too long, the output is not stable, the economic benefits are low, and the generated biogas slurry and biogas residue are difficult to handle. Although incineration can effectively reduce the volume of garbage, it will release a large amount of carbon dioxide and other harmful gases during the incineration process, polluting the air and affecting climate change. Although landfill is simple to operate, it occupies a lot of land resources, and as the garbage piles for a longer time, the leachate may seep into the groundwater and pollute the soil and water sources. The composting process is simple and mature, but the composting time is too long. At the same time, the food waste contains certain heavy metals and salts, which leads to a certain risk of soil salinization. During the composting process, certain harmful gases such as ammonia, hydrogen sulfide, and methane will be produced. If not properly controlled, it will cause certain environmental pollution. Therefore, the traditional food waste treatment method is facing increasingly severe environmental and social pressures. It is urgent to develop more environmentally friendly and sustainable treatment technologies to reduce the negative impact on the ecological environment and promote the green transformation of waste treatment.

[0003] At the same time, in the preparation of ultrafine copper powder, ultrafine copper powder is widely used in many high-tech fields such as capacitor electrodes, powder metallurgy, petrochemicals, etc. due to its high activity, high strength and excellent conductivity, and has become a key basic raw material in these industries. In order to meet the needs of different application fields, the preparation method of ultrafine copper powder has developed a variety of technical routes, mainly including three categories: gas phase method, solid phase method and liquid phase method. The gas phase method is a relatively advanced preparation technology, which obtains ultrafine copper powder by controlling the decomposition and deposition of copper source in gas phase reaction. However, the gas phase method has high requirements for equipment, requires special reactors and strict operating conditions, and the control of factors such as temperature and pressure during the reaction process is also very demanding. In addition, the energy consumption of the gas phase method is large, resulting in a high cost of the production process, which limits its popularization and application in large-scale production. The solid phase method is widely used in the preparation of copper powder. The solid phase method uses physical and mechanical methods, such as ball milling or high-energy vibration, to change the morphology of copper raw materials in the solid state, thereby obtaining ultrafine copper powder. Although this method has simple equipment and low cost, it is easy to introduce impurities during the processing, especially under high temperature or high pressure environment, which may affect the purity and performance of the final product and reduce the overall quality of the copper powder. The liquid phase method dissolves the copper source in the liquid and precipitates ultrafine copper powder with the help of chemical reaction. Compared with the gas phase method and the solid phase method, this method can better control the size and distribution of particles, but the liquid phase method uses expensive chemical reducing agents to complete the reaction, which increases the cost of production, and the chemical reaction in the production process is more complicated. Therefore, the liquid phase method still faces certain challenges in terms of economy and environmental protection. The preparation of ultrafine copper powder is the core bottleneck of my country's development in the field of copper and copper alloys. It is urgent to develop ultrafine copper powder production technology with uniform and controllable particle size, low cost, continuous and efficient. Summary of the invention

[0004] In order to overcome the defects of the above-mentioned prior art, the purpose of the present invention is to provide an integrated restaurant waste gasification-hydrothermal synthesis multi-fusion system and method to solve the technical problem of how to improve the utilization rate of restaurant waste and prepare ultrafine copper powder at the same time in the prior art.

[0005] The present invention is achieved through the following technical solutions:

[0006] In a first aspect, the present invention provides an integrated kitchen waste gasification-hydrothermal synthesis multi-fusion system, including a water output pipeline, a slurry output pipeline, a liquid oxygen output pipeline, a coupling reaction device, a copper solution output pipeline, a copper powder separation unit, a hydrogen separation unit, and a slag discharge unit;

[0007] The coupled reaction device comprises a supercritical water gasification module, an oxidation module and a supercritical hydrothermal synthesis module which are sequentially arranged from the outside to the inside, and the supercritical water gasification module, the oxidation module and the supercritical hydrothermal synthesis module are connected;

[0008] The output ends of the water output pipeline and the slurry output pipeline are connected to the input end of the supercritical water gasification module; the output end of the supercritical water gasification module is connected to the slag discharge unit;

[0009] The output end of the liquid oxygen output pipeline is connected to the input end of the oxidation module, and the output end of the oxidation module is connected to the hydrogen separation unit;

[0010] The input end of the copper solution output pipeline is used to input a copper precursor solution and an alkaline solution, the output end of the copper solution output pipeline is connected to the input end of a supercritical hydrothermal synthesis module, and the output end of the supercritical hydrothermal synthesis module is connected to a copper powder separation unit.

[0011] Preferably, the feed port of the supercritical water gasification module is connected to the output ends of the water output pipeline and the slurry output pipeline respectively, the pipeline of the discharge port of the supercritical water gasification module passes through the oxidation module and is connected to the feed port of the supercritical hydrothermal synthesis module; the slag discharge port of the supercritical water gasification module is connected to the slag discharge unit;

[0012] The liquid inlet of the supercritical hydrothermal synthesis module is connected to the output end of the copper solution output pipeline; the pipeline of the discharge port of the supercritical hydrothermal synthesis module sequentially passes through the oxidation module and the supercritical water gasification module and is connected to the copper powder separation unit;

[0013] The air inlet of the oxidation module is respectively connected to the liquid oxygen output pipeline and the air outlet of the supercritical water thermal synthesis module, and the pipeline of the air outlet of the oxidation module passes through the supercritical water gasification module and is connected to the hydrogen separation unit.

[0014] Further, the feed port of the supercritical water gasification module is connected to the output ends of the water output pipeline and the slurry output pipeline respectively, the discharge port of the supercritical water gasification module is connected to the feed port of the oxidation module, and the slag discharge port of the supercritical water gasification module is connected to the slag discharge unit;

[0015] The air inlet of the oxidation module is connected to the liquid oxygen output pipeline; the material outlet of the oxidation module is connected to the material inlet of the supercritical water thermal synthesis module; the pipeline of the air outlet of the oxidation module passes through the supercritical water gasification module and is connected to the hydrogen separation unit;

[0016] The liquid inlet of the supercritical hydrothermal synthesis module is connected to the output end of the copper solution output pipeline; the pipeline of the discharge port of the supercritical hydrothermal synthesis module sequentially passes through the oxidation module and the supercritical water gasification module and is connected to the copper powder separation unit.

[0017] Furthermore, a heating device is provided on the outer wall of the supercritical water gasification module.

[0018] Furthermore, the copper powder separation unit includes a first cooler and a liquid-solid separator;

[0019] The input end of the first cooler is connected to the pipeline of the discharge port of the supercritical hydrothermal synthesis module, and the output end of the first cooler is connected to the input end of the liquid-solid separator.

[0020] Further, the hydrogen separation unit includes a second cooler and a gas-liquid separator;

[0021] The input end of the second cooler is connected to the pipeline of the gas outlet of the oxidation module; the output end of the second cooler is connected to the input end of the gas-liquid separator;

[0022] The second cooler is also provided with a heat output end, and the heat output end is connected to a heat generator.

[0023] Further, the slag discharge unit includes a third cooler and a lock hopper;

[0024] The input end of the third cooler is connected to the slag discharge port of the supercritical water gasification module, and the output end of the third 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.

[0025] Further, the copper solution output pipeline includes a copper precursor solution pipeline and an alkaline solution pipeline;

[0026] The input end of the copper precursor solution pipeline is provided with a copper precursor solution pump for inputting the copper precursor solution; the input end of the alkaline solution pipeline is provided with an alkaline solution pump for inputting the alkaline solution;

[0027] The output ends of the copper precursor solution pipeline and the alkaline solution pipeline are respectively connected to the liquid inlet of the supercritical hydrothermal synthesis module.

[0028] Furthermore, a water pump is provided on the water output pipeline; a slurry pump is provided on the slurry output pipeline; and a liquid oxygen pump and an air preheater are provided on the liquid oxygen output pipeline in sequence.

[0029] In a second aspect, the present invention further provides a method for using an integrated restaurant kitchen waste gasification-hydrothermal synthesis multi-fusion system, based on the above-mentioned integrated restaurant kitchen waste gasification-hydrothermal synthesis multi-fusion system, comprising the following steps:

[0030] Inputting water and kitchen waste slurry into the supercritical water gasification module of the coupled reaction device through the water output pipeline and the slurry output pipeline respectively to obtain the gasification product, which is used as a reducing agent and a heat source after ash separation and flows into the supercritical hydrothermal synthesis module, and generates hydrogen-rich gas in the supercritical hydrothermal synthesis module;

[0031] The copper precursor solution and the alkaline solution are input into the supercritical hydrothermal synthesis module of the coupling reaction device through the copper solution output pipeline, and the products are output into the copper powder separation unit for separation to obtain copper powder through the reduction reaction of the hydrogen-rich gas with the copper precursor solution and the alkaline solution;

[0032] Liquid oxygen is input into the oxidation module of the coupled reaction device through the liquid oxygen output pipeline, and the hydrogen-rich gas reacts with oxygen to release heat, and the heat is transferred to the supercritical water gasification module and the supercritical hydrothermal synthesis module. At the same time, the mixed product in the oxidation module is output to the hydrogen separation unit for separation to obtain hydrogen.

[0033] Compared with the prior art, the present invention has the following beneficial technical effects:

[0034] The present invention provides an integrated kitchen waste gasification-hydrothermal synthesis multi-fusion system. A coupling reaction device integrates a supercritical water gasification module, a supercritical hydrothermal synthesis module and an oxidation module through a sleeve structure; the supercritical hydrothermal synthesis module is in the innermost layer, the oxidation module is in the middle layer, and the supercritical water gasification module is in the outermost layer; the oxidation module releases heat during oxidation, which is directly transferred to the supercritical water gasification module and the supercritical hydrothermal synthesis module through inter-wall heat transfer, thereby reducing the time for the reaction to reach the target temperature, reducing the use of heat exchangers, and reducing costs. Direct heat transfer can reduce system energy loss, speed up the speed of reaching the target reaction temperature, and improve the energy efficiency of the system. In addition, local high temperature of the oxidation module can be avoided, and the stable operation of the system can be achieved. At the same time, the system converts kitchen waste into hydrogen, realizing the conversion of waste into resources. The gasification product directly flows into the supercritical hydrothermal synthesis module, shortens the transfer path, stabilizes the temperature during the transfer process, and reduces energy loss in the process. At the same time, the supercritical water gasification module is directly connected to the supercritical hydrothermal synthesis module, so that the hydrogen-rich gas produced by the supercritical water gasification of food waste directly replaces the reducing agent to reduce the ultrafine copper powder. By adjusting the internal structure of the coupled reaction device, the reaction sequence can be optimized to better meet different production needs.

[0035] Furthermore, through the supercritical water gasification process, the organic matter in the water and slurry can be effectively converted into gas, providing the necessary energy and raw materials for the subsequent synthesis and oxidation processes. The oxidation module receives the gas from the liquid oxygen output pipeline and the outlet of the supercritical hydrothermal synthesis module, thereby realizing the effective utilization and oxidation treatment of the gas and reducing the emission of harmful gases. The product of the supercritical water gasification module first enters the supercritical hydrothermal synthesis module. The hydrogen-rich gas produced by gasification can directly replace the reducing agent to reduce the ultrafine copper powder, effectively meeting the preparation of ultrafine copper powder. The remaining gas then enters the oxidation module for oxidation, and the module oxidation simultaneously provides heat for the supercritical water gasification module and the supercritical hydrothermal synthesis module.

[0036] Furthermore, the oxidation module receives the gasification products from the supercritical water gasification module and reacts with oxygen to release a large amount of heat energy, which is further utilized by the supercritical hydrothermal synthesis module, realizing the cascade utilization and efficient conversion of heat energy. The hydrogen-rich gas produced by the supercritical water gasification of food waste first enters the oxidation module for oxidation and heat release, providing heat for the supercritical water gasification module and the supercritical hydrothermal synthesis module, effectively meeting the heating demand. The remaining hydrogen-rich gas enters the supercritical hydrothermal synthesis module, replacing the expensive chemical reducing agent to reduce the ultrafine copper powder.

[0037] Furthermore, a heating device is provided on the outer wall of the supercritical water gasification module, which can accurately control the temperature inside the supercritical water gasification module to make it reach a supercritical state. In the supercritical state, the physical properties of water change, and it has a very high solubility and reactivity, thereby improving the rate and efficiency of the gasification reaction. Through the precise control of the heating device, the conditions of the gasification reaction can be optimized, making the reaction more sufficient and efficient, thereby improving the gasification efficiency of the entire system.

[0038] Furthermore, the first cooler can effectively reduce the temperature of the high-temperature material output from the supercritical hydrothermal synthesis module. The cooled material enters the liquid-solid separator, which can more easily achieve effective separation of solid and liquid. Through effective solid-liquid separation, it can ensure that the obtained copper powder has high purity and uniformity.

[0039] Furthermore, the second cooler can effectively reduce the temperature of the high-temperature gas output from the oxidation module. By precisely controlling the cooling process, it can ensure that the gas is in a suitable temperature range when entering the gas-liquid separator, thereby improving the separation efficiency and stability. The cooled gas enters the gas-liquid separator, which makes it easier to effectively separate the gas and liquid. Through efficient gas-liquid separation, it can be ensured that the obtained gas has high purity and stability to meet the requirements of subsequent processes or products. The second cooler absorbs and takes away a large amount of heat energy during the cooling process. By setting a heat output end and connecting a heat generator, the heat energy can be recovered and converted into usable heat energy resources. Heat energy recovery not only helps to reduce energy consumption, but also improves the energy utilization efficiency of the entire system and realizes sustainable use of energy.

[0040] Furthermore, the third cooler can effectively reduce the temperature of the high-temperature slag discharged from the supercritical water gasification module to a safe handling range. The lock hopper can control the humidity and fluidity of the slag in the lock hopper by adjusting the water injection ball valve on the water injection pipeline, which helps to discharge the slag smoothly. The slag discharge needle valve set on the slag discharge pipeline can accurately control the discharge amount of the slag.

[0041] Furthermore, the copper precursor solution pump and the alkaline solution pump can accurately control the input amount of the copper precursor solution and the alkaline solution. Through the pumping system, reactants can be continuously and stably supplied to the supercritical hydrothermal synthesis module.

[0042] Furthermore, the water pump, slurry pump and liquid oxygen pump can accurately control the flow rate of the fluid in their respective pipelines, which helps to ensure that the required fluid volume and pressure are obtained in subsequent process steps, thereby improving the stability and controllability of the entire production process. An air preheater is installed on the liquid oxygen output pipeline, and the heat generated by the liquid oxygen pump can be used to preheat the air, which helps to reduce energy consumption, improve energy utilization efficiency, and reduce the impact on the environment.

[0043] The present invention also provides a method for using an integrated kitchen waste gasification-hydrothermal synthesis multi-fusion system. The oxidation module of the coupled system releases heat through oxidation, which is directly transferred to the supercritical water gasification module and the supercritical hydrothermal synthesis module through inter-wall heat transfer, thereby reducing the time for the reaction to reach the target temperature, reducing the use of heat exchangers, and reducing costs. Direct heat transfer can reduce system energy loss, accelerate the speed of reaching the target reaction temperature, and improve the energy efficiency of the system. In addition, local high temperature of the oxidation module can be avoided to achieve stable operation of the system. At the same time, the system converts kitchen waste into hydrogen, realizing the conversion of waste into resources. The gasification product directly flows into the supercritical hydrothermal synthesis module, shortens the transfer path, stabilizes the temperature during the transfer process, and reduces energy loss in the process. By adjusting the internal structure of the coupled reaction device, the reaction sequence can be optimized to better meet different production needs. Among them, the product of the supercritical water gasification module first enters the supercritical hydrothermal synthesis module, and the hydrogen-rich gas generated by gasification can directly replace the reducing agent to reduce the ultrafine copper powder. The remaining gas then enters the oxidation module for oxidation, and the module oxidation simultaneously provides heat for the supercritical water gasification module and the supercritical hydrothermal synthesis module. The hydrogen-rich gas produced by the supercritical water gasification of food waste first enters the oxidation module for oxidation and heat release, providing heat for the supercritical water gasification module and the supercritical hydrothermal synthesis module. The remaining hydrogen-rich gas enters the supercritical hydrothermal synthesis module to replace the expensive chemical reducing agent and reduce the ultrafine copper powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a first structural schematic diagram of the integrated kitchen waste gasification-hydrothermal synthesis multi-fusion system in an embodiment of the present invention;

[0045] Figure 2 It is a second structural schematic diagram of the integrated kitchen waste gasification-hydrothermal synthesis multi-fusion system in an embodiment of the present invention;

[0046] In the figure: 1. water pump; 2. slurry pump; 3. liquid oxygen pump; 4. air preheater; 5. coupled reaction device; 6. supercritical water gasification module; 7. supercritical hydrothermal synthesis module; 8. oxidation module; 9. heating device; 10. copper precursor solution pump; 11. alkaline solution pump; 12. first cooler; 13. liquid-solid separator; 14. second cooler; 15. gas-liquid separator; 16. heat generator; 17. third cooler; 18. lock hopper. DETAILED DESCRIPTION

[0047] 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.

[0048] The object of the present invention is to provide an integrated restaurant waste gasification-hydrothermal synthesis multi-fusion system and method to solve the technical problem of how to improve the utilization rate of restaurant waste and prepare ultrafine copper powder at the same time in the prior art.

[0049] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0050] Example 1

[0051] See also Figure 1 and Figure 2 In one embodiment of the present invention, an integrated kitchen waste gasification-hydrothermal synthesis multi-fusion system is provided, comprising a water output pipeline, a slurry output pipeline, a liquid oxygen output pipeline, a coupling reaction device 5, a copper solution output pipeline, a copper powder separation unit, a hydrogen separation unit and a slag removal unit; the coupling reaction device 5 comprises a supercritical water gasification module 6, an oxidation module 8 and a supercritical hydrothermal synthesis module 7 which are sequentially arranged from the outside to the inside, and the supercritical water gasification module 6, the oxidation module 8 and the supercritical hydrothermal synthesis module 7 are connected to each other; the output ends of the water output pipeline and the slurry output pipeline are connected to the input end of the supercritical water gasification module 6; the output end of the supercritical water gasification module 6 is connected to the slag removal unit; the output end of the liquid oxygen output pipeline is connected to the input end of the oxidation module 8, and the output end of the oxidation module 8 is connected to the hydrogen separation unit; the input end of the copper solution output pipeline is used to input a copper precursor solution and an alkaline solution, the output end of the copper solution output pipeline is connected to the input end of the supercritical hydrothermal synthesis module 7, and the output end of the supercritical hydrothermal synthesis module 7 is connected to the copper powder separation unit.

[0052] Specifically, according to Figure 1As shown, the feed port of the supercritical water gasification module 6 is respectively connected to the output ends of the water output pipeline and the slurry output pipeline, and the pipeline of the discharge port of the supercritical water gasification module 6 passes through the oxidation module 8 and is connected to the feed port of the supercritical hydrothermal synthesis module 7; the slag discharge port of the supercritical water gasification module 6 is connected to the slag discharge unit; the liquid inlet of the supercritical hydrothermal synthesis module 7 is connected to the output end of the copper solution output pipeline; the pipeline of the discharge port of the supercritical hydrothermal synthesis module 7 passes through the oxidation module 8 and the supercritical water gasification module 6 in sequence and is connected to the copper powder separation unit; the air inlet of the oxidation module 8 is respectively connected to the liquid oxygen output pipeline and the air outlet of the supercritical hydrothermal synthesis module 7, and the pipeline of the air outlet of the oxidation module 8 passes through the supercritical water gasification module 6 and is connected to the hydrogen separation unit.

[0053] Specifically, according to Figure 2 As shown, the feed port of the supercritical water gasification module 6 is respectively connected to the output ends of the water output pipeline and the slurry output pipeline, the discharge port of the supercritical water gasification module 6 is connected to the feed port of the oxidation module 8, and the slag discharge port of the supercritical water gasification module 6 is connected to the slag discharge unit; the air inlet of the oxidation module 8 is connected to the liquid oxygen output pipeline; the discharge port of the oxidation module 8 is connected to the feed port of the supercritical hydrothermal synthesis module 7; the pipeline of the air outlet of the oxidation module 8 passes through the supercritical water gasification module 6 and is connected to the hydrogen separation unit; the liquid inlet of the supercritical hydrothermal synthesis module 7 is connected to the output end of the copper solution output pipeline; the pipeline of the discharge port of the supercritical hydrothermal synthesis module 7 passes through the oxidation module 8 and the supercritical water gasification module 6 in sequence and is connected to the copper powder separation unit.

[0054] In this embodiment, a heating device 9 is provided on the outer wall of the supercritical water gasification module 6 .

[0055] The structural principle of this embodiment is as follows:

[0056] The heating device 9 is installed on the outer wall of the supercritical water gasification module 6, and its main function is to provide the required heat for the supercritical water gasification module 6. Through the heating effect of the heating device 9, it can be ensured that the water or other reaction medium inside the supercritical water gasification module 6 reaches a supercritical state.

[0057] In this embodiment, the copper powder separation unit includes a first cooler 12 and a liquid-solid separator 13; the input end of the first cooler 12 is connected to the pipeline of the discharge port of the supercritical hydrothermal synthesis module 7, and the output end of the first cooler 12 is connected to the input end of the liquid-solid separator 13.

[0058] The structural principle of this embodiment is as follows:

[0059] The high-temperature material discharged from the discharge port of the supercritical hydrothermal synthesis module 7 first enters the first cooler 12. In the first cooler 12, the high-temperature material exchanges heat with the cooling medium (such as cooling water or other low-temperature fluid), thereby reducing the temperature of the material. The cooled material then enters the liquid-solid separator 13. The liquid-solid separator 13 separates the solid components and liquid components in the material based on the centrifugal separation principle or other separation mechanisms.

[0060] In this embodiment, the hydrogen separation unit includes a second cooler 14 and a gas-liquid separator 15;

[0061] The input end of the second cooler 14 is connected to the pipeline of the air outlet of the oxidation module 8; the output end of the second cooler 14 is connected to the input end of the gas-liquid separator 15; wherein the second cooler 14 is also provided with a heat output end, and the heat output end is connected to a heat generator 16.

[0062] The structural principle of this embodiment is as follows:

[0063] The high-temperature gas discharged from the gas outlet of the oxidation module 8 first enters the second cooler 14. In the second cooler 14, the high-temperature gas exchanges heat with a cooling medium (such as cooling water or other low-temperature fluids) to reduce the temperature of the gas. The cooled gas then enters the gas-liquid separator 15. The gas-liquid separator 15 uses the different physical properties of gas and liquid for separation. In this process, the gas component is separated and discharged through the outlet; while the liquid component is discharged through another outlet. Through the heat generator 16, the heat absorbed in the second cooler 14 can be converted into thermal energy or other forms of energy for heating needs in other process steps or equipment.

[0064] In this embodiment, the slag discharge unit includes a third cooler 17 and a lock hopper 18; the input end of the third cooler 17 is connected to the slag discharge port of the supercritical water gasification module 6, and the output end of the third cooler 17 is connected to the input end of the lock hopper 18; the lock hopper 18 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.

[0065] The structural principle of this embodiment is as follows:

[0066] The high-temperature slag discharged from the slag discharge port of the supercritical water gasification module 6 first enters the third cooler 17, in which the high-temperature slag exchanges heat with the cooling medium to reduce the temperature of the slag, and the cooled slag then enters the lock hopper 18. The lock hopper 18 serves as a temporary storage and buffer device to ensure that the slag is fully accumulated and stabilized before discharge. When the slag in the lock hopper 18 accumulates to a certain amount, it can be discharged through the slag discharge pipeline. The water injection pipeline is used to inject cooling water or other fluids into the lock hopper 18 to further cool the slag and prevent it from solidifying or clogging.

[0067] In this embodiment, the copper solution output pipeline includes a copper precursor solution pipeline and an alkaline solution pipeline; the input end of the copper precursor solution pipeline is provided with a copper precursor solution pump 10 for inputting the copper precursor solution; the input end of the alkaline solution pipeline is provided with an alkaline solution pump 11 for inputting the alkaline solution; the output ends of the copper precursor solution pipeline and the alkaline solution pipeline are respectively connected to the liquid inlet of the supercritical hydrothermal synthesis module 7.

[0068] In this embodiment, a water pump 1 is provided on the water output pipeline; a slurry pump 2 is provided on the slurry output pipeline; and a liquid oxygen pump 3 and an air preheater 4 are provided in sequence on the liquid oxygen output pipeline.

[0069] In summary, the present invention provides an integrated kitchen waste gasification-hydrothermal synthesis multi-fusion system, wherein the coupling reaction device 5 integrates the supercritical water gasification module 6, the supercritical hydrothermal synthesis module 7 and the oxidation module 8 through a sleeve structure; the supercritical hydrothermal synthesis module 7 is in the innermost layer, the oxidation module 8 is in the middle layer, and the supercritical water gasification module 6 is in the outermost layer; the oxidation module 8 oxidizes and releases heat, which is directly transferred to the supercritical water gasification module 6 and the supercritical hydrothermal synthesis module through inter-wall heat transfer, thereby reducing the time for the reaction to reach the target temperature, reducing the use of heat exchangers, and reducing costs. Direct heat transfer can reduce system energy loss, speed up the speed of reaching the target reaction temperature, and improve the energy efficiency of the system. In addition, local high temperature of the oxidation module 8 can also be avoided to achieve stable operation of the system. At the same time, the system converts kitchen waste into hydrogen, realizing the conversion of waste into resources. The gasification product flows directly into the supercritical hydrothermal synthesis module 7, shortens the transfer path, stabilizes the temperature during the transfer process, and reduces energy loss in the process. At the same time, the supercritical water gasification module 6 is directly connected to the supercritical hydrothermal synthesis module 7, so that the hydrogen-rich gas produced by the supercritical water gasification of the kitchen waste directly replaces the reducing agent to reduce the ultrafine copper powder. By adjusting the internal structure of the coupled reaction device 5, the reaction sequence can be optimized to better meet different production needs.

[0070] Example 2

[0071] This embodiment provides a method for using an integrated restaurant kitchen waste gasification-hydrothermal synthesis multi-fusion system, based on the above-mentioned integrated restaurant kitchen waste gasification-hydrothermal synthesis multi-fusion system, including the following process:

[0072] Water and kitchen waste slurry are respectively input into the supercritical water gasification module 6 of the coupling reaction device 5 through the water output pipeline and the slurry output pipeline to obtain the gasification product, which flows into the supercritical water thermal synthesis module 7 as a reducing agent and heat source after ash separation; the supercritical water gasification module 6 is provided with a slag discharge unit. When discharging slag, the water injection ball valve is opened, water is injected into the lock hopper 18, and then the water injection ball valve is closed. Then the slag discharge needle valve is quickly opened. The slag particles at the bottom of the supercritical water gasification module 6 are transported to the third cooler 17 for cooling due to the pressure difference, and the mixture enters the lock hopper 18. When the pressure of the entire system reaches equilibrium, the slag discharge needle valve will be closed. Then the ball valve is opened, and the liquid-solid mixture in the lock hopper 18 is discharged.

[0073] The copper precursor solution and the alkaline solution are input into the supercritical hydrothermal synthesis module 7 of the coupling reaction device 5 through the copper solution output pipeline, and the hydrogen-rich gas and the copper precursor solution (CuSO4, Cu(NO3)2, Cu(HCOO)2 and other precursors) and the alkaline solution (NaOH, KOH and other modifiers) enter the supercritical hydrothermal synthesis module 7 for reduction reaction to obtain the product, and the product flow is cooled through the first cooler 12, and the ultrafine copper powder can be separated in the liquid-solid separator 13.

[0074] The liquid oxygen is pressurized by the liquid oxygen pump 3 in the liquid oxygen output pipeline, flows through the air preheater 4 for preheating, and then flows into the oxidation module 8 of the coupling reaction device 5. The hydrogen-rich gas from the supercritical water thermal synthesis module 7 enters the oxidation module 8 and reacts with oxygen to release heat, which is transferred to the supercritical water gasification module 6 and the supercritical water thermal synthesis module 7 through inter-wall heat transfer; the mixed product further releases heat in the second cooler 14, and obtains gas through the gas-liquid separator 15. The heat generator 16 recovers the waste heat in the second cooler 14 to supply heat to the outside;

[0075] according to Figure 1 As shown, the product of the supercritical water gasification module 6 first enters the supercritical hydrothermal synthesis module 7, and the hydrogen-rich gas produced by gasification can directly replace the reducing agent to reduce the ultrafine copper powder. The remaining gas then enters the oxidation module 8 for oxidation, and the module oxidation simultaneously provides heat for the supercritical water gasification module 6 and the supercritical hydrothermal synthesis module 7.

[0076] according to Figure 2As shown, the discharge port of the supercritical water gasification module 6 is connected to the feed port of the oxidation module 8; the discharge port of the oxidation module 8 is connected to the feed port of the supercritical hydrothermal synthesis module 7. The hydrogen-rich gas produced by the supercritical water gasification of the kitchen waste first enters the oxidation module 8 for oxidation and heat release, providing heat for the supercritical water gasification module 6 and the supercritical hydrothermal synthesis module 7. The remaining hydrogen-rich gas enters the supercritical hydrothermal synthesis module 7 to replace the expensive chemical reducing agent and reduce the ultrafine copper powder.

[0077] In this embodiment, hydrogen produced by supercritical water gasification of kitchen waste is used as a reducing agent to directly participate in the subsequent supercritical hydrothermal synthesis of ultrafine copper powder, thereby avoiding the use of expensive chemical reagents (such as HCOOH, CH3OH, C6H8O6, etc.), shortening the reaction time, and realizing the clean, efficient and low-cost production of ultrafine copper powder. By using supercritical water gasification of kitchen waste to produce hydrogen, low-grade kitchen waste is converted into high-grade hydrogen, which realizes the resource utilization of waste and reduces the cost of garbage treatment. At the same time, the coupled reaction device 5 integrates the supercritical water gasification module 6, the oxidation module 8 and the supercritical hydrothermal synthesis module 7 through a sleeve structure. The oxidation exothermic heat provides heat for the supercritical water gasification module 6 and the supercritical hydrothermal synthesis module 7, reducing the time for the reactor to reach the target temperature, reducing the use of heat exchangers, reducing costs, and achieving energy self-sufficiency.

[0078] In summary, the present invention also provides a method for using an integrated kitchen waste gasification-hydrothermal synthesis multi-fusion system. The oxidation module 8 of the coupling system oxidizes and releases heat, which is directly transferred to the supercritical water gasification module 6 and the supercritical hydrothermal synthesis module through inter-wall heat transfer, which reduces the time for the reaction to reach the target temperature, reduces the use of heat exchangers, and reduces costs. Direct heat transfer can reduce system energy loss, speed up the speed of reaching the target reaction temperature, and improve the energy efficiency of the system. In addition, local high temperature of the oxidation module 8 can also be avoided to achieve stable operation of the system. At the same time, the system converts kitchen waste into hydrogen, realizing the conversion of waste into resources. The gasification product directly flows into the supercritical hydrothermal synthesis module 7, shortens the transfer path, stabilizes the temperature during the transfer process, and reduces energy loss in the process. By adjusting the internal structure of the coupled reaction device 5, the reaction sequence can be optimized to better meet different production needs. Among them, the product of the supercritical water gasification module 6 first enters the supercritical hydrothermal synthesis module 7, and the hydrogen-rich gas generated by gasification can directly replace the reducing agent to reduce the ultrafine copper powder. The remaining gas then enters the oxidation module 8 for oxidation, and the module oxidation simultaneously provides heat for the supercritical water gasification module 6 and the supercritical hydrothermal synthesis module 7. The hydrogen-rich gas produced by supercritical water gasification of kitchen waste first enters the oxidation module 8 for oxidation and heat release, providing heat for the supercritical water gasification module 6 and the supercritical hydrothermal synthesis module 7. The remaining hydrogen-rich gas enters the supercritical hydrothermal synthesis module 7 to replace the expensive chemical reducing agent and reduce the ultrafine copper powder.

[0079] 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 kitchen waste gasification-hydrothermal synthesis multi-fusion system, characterized in that: It includes a water output pipeline, a slurry output pipeline, a liquid oxygen output pipeline, a coupling reaction device (5), a copper solution output pipeline, a copper powder separation unit, a hydrogen separation unit and a slag discharge unit; The coupled reaction device (5) comprises a supercritical water gasification module (6), an oxidation module (8) and a supercritical hydrothermal synthesis module (7) which are sequentially arranged from the outside to the inside, and the supercritical water gasification module (6), the oxidation module (8) and the supercritical hydrothermal synthesis module (7) are arranged in communication with each other; The output ends of the water output pipeline and the slurry output pipeline are connected to the input end of the supercritical water gasification module (6); the output end of the supercritical water gasification module (6) is connected to the slag discharge unit; The output end of the liquid oxygen output pipeline is connected to the input end of the oxidation module (8), and the output end of the oxidation module (8) is connected to the hydrogen separation unit; The input end of the copper solution output pipeline is used to input a copper precursor solution and an alkaline solution, the output end of the copper solution output pipeline is connected to the input end of a supercritical hydrothermal synthesis module (7), and the output end of the supercritical hydrothermal synthesis module (7) is connected to a copper powder separation unit.

2. The integrated kitchen waste gasification-hydrothermal synthesis multi-fusion system according to claim 1, characterized in that: The feed port of the supercritical water gasification module (6) is connected to the output ends of the water output pipeline and the slurry output pipeline respectively; the pipeline of the discharge port of the supercritical water gasification module (6) passes through the oxidation module (8) and is connected to the feed port of the supercritical hydrothermal synthesis module (7); the slag discharge port of the supercritical water gasification module (6) is connected to the slag discharge unit; The liquid inlet of the supercritical hydrothermal synthesis module (7) is connected to the output end of the copper solution output pipeline; the pipeline of the material outlet of the supercritical hydrothermal synthesis module (7) sequentially passes through the oxidation module (8) and the supercritical water gasification module (6) and is connected to the copper powder separation unit; The air inlet of the oxidation module (8) is respectively connected to the liquid oxygen output pipeline and the air outlet of the supercritical water thermal synthesis module (7), and the pipeline of the air outlet of the oxidation module (8) passes through the supercritical water gasification module (6) and is connected to the hydrogen separation unit.

3. The integrated kitchen waste gasification-hydrothermal synthesis multi-fusion system according to claim 1, characterized in that: The feed port of the supercritical water gasification module (6) is connected to the output ends of the water output pipeline and the slurry output pipeline respectively, the discharge port of the supercritical water gasification module (6) is connected to the feed port of the oxidation module (8), and the slag discharge port of the supercritical water gasification module (6) is connected to the slag discharge unit; The air inlet of the oxidation module (8) is connected to the liquid oxygen output pipeline; the material outlet of the oxidation module (8) is connected to the material inlet of the supercritical water thermal synthesis module (7); the pipeline of the air outlet of the oxidation module (8) passes through the supercritical water gasification module (6) and is connected to the hydrogen separation unit; The liquid inlet of the supercritical hydrothermal synthesis module (7) is connected to the output end of the copper solution output pipeline; the pipeline of the material outlet of the supercritical hydrothermal synthesis module (7) sequentially passes through the oxidation module (8) and the supercritical water gasification module (6) and is connected to the copper powder separation unit.

4. The integrated kitchen waste gasification-hydrothermal synthesis multi-fusion system according to claim 2 or 3, characterized in that: A heating device (9) is provided on the outer wall of the supercritical water gasification module (6).

5. The integrated kitchen waste gasification-hydrothermal synthesis multi-fusion system according to claim 2 or 3, characterized in that: The copper powder separation unit comprises a first cooler (12) and a liquid-solid separator (13); The input end of the first cooler (12) is connected to the pipeline of the discharge port of the supercritical hydrothermal synthesis module (7), and the output end of the first cooler (12) is connected to the input end of the liquid-solid separator (13).

6. The integrated kitchen waste gasification-hydrothermal synthesis multi-fusion system according to claim 2 or 3, characterized in that: The hydrogen separation unit comprises a second cooler (14) and a gas-liquid separator (15); The input end of the second cooler (14) is connected to the pipeline of the gas outlet of the oxidation module (8); the output end of the second cooler (14) is connected to the input end of the gas-liquid separator (15); The second cooler (14) is also provided with a heat output end, and the heat output end is connected to the heat generator (16).

7. The integrated kitchen waste gasification-hydrothermal synthesis multi-fusion system according to claim 2 or 3, characterized in that: The slag discharge unit comprises a third cooler (17) and a lock hopper (18); The input end of the third cooler (17) is connected to the slag discharge port of the supercritical water gasification module (6), and the output end of the third cooler (17) is connected to the input end of the lock hopper (18); the lock hopper (18) 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.

8. The integrated kitchen waste gasification-hydrothermal synthesis multi-fusion system according to claim 2 or 3, characterized in that: The copper solution output pipeline includes a copper precursor solution pipeline and an alkaline solution pipeline; The input end of the copper precursor solution pipeline is provided with a copper precursor solution pump (10) for inputting the copper precursor solution; the input end of the alkaline solution pipeline is provided with an alkaline solution pump (11) for inputting the alkaline solution; The output ends of the copper precursor solution pipeline and the alkaline solution pipeline are respectively connected to the liquid inlet of the supercritical hydrothermal synthesis module (7).

9. The integrated kitchen waste gasification-hydrothermal synthesis multi-fusion system according to claim 2 or 3, characterized in that: The water output pipeline is provided with a water pump (1); the slurry output pipeline is provided with a slurry pump (2); and the liquid oxygen output pipeline is provided with a liquid oxygen pump (3) and an air preheater (4) in sequence.

10. A method for using an integrated kitchen waste gasification-hydrothermal synthesis multi-fusion system, characterized in that: An integrated kitchen waste gasification-hydrothermal synthesis multi-fusion system according to any one of claims 1 to 9 comprises the following steps: Inputting water and kitchen waste slurry into a supercritical water gasification module (6) of a coupled reaction device (5) through a water output pipeline and a slurry output pipeline respectively, obtaining a gasification product which, after ash separation, flows into a supercritical hydrothermal synthesis module (7) as a reducing agent and a heat source, and generates hydrogen-rich gas in the supercritical hydrothermal synthesis module (7); The copper precursor solution and the alkaline solution are input into the supercritical hydrothermal synthesis module (7) of the coupled reaction device (5) through the copper solution output pipeline, and the hydrogen-rich gas is subjected to a reduction reaction with the copper precursor solution and the alkaline solution to obtain a product which is output to a copper powder separation unit for separation to obtain copper powder; Liquid oxygen is input into the oxidation module (8) of the coupled reaction device (5) through a liquid oxygen output pipeline, and the hydrogen-rich gas reacts with oxygen to release heat, and the heat is transferred to the supercritical water gasification module (6) and the supercritical water thermal synthesis module (7), and at the same time, the mixed product in the oxidation module (8) is output to a hydrogen separation unit for separation to obtain hydrogen.

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