Biomass / organic solid wastewater heat gasification coupling water electrolysis hydrogen electric heating poly-generation system

Abstract

The invention discloses a biomass / organic solid wastewater hot gasification coupling water electrolysis hydrogen electric heating poly-generation system which is characterized in that an outlet of a gasification reactor is communicated with an inlet of a first mixed working medium turbine, and an outlet of the first mixed working medium turbine is communicated with an inlet of a multi-stage oxidation heat exchange system; an outlet of the multi-stage oxidation heat exchange system is communicated with an inlet of a second mixed working medium turbine, the first mixed working medium turbine and the second mixed working medium turbine are connected with a generator, and the output end of the generator is communicated with a power interface of a water electrolysis device. An oxygen outlet of the water electrolysis device is communicated with an inlet of the first-stage oxidation reactor and an inlet of the second-stage oxidation reactor; an outlet of the second mixed working medium turbine is connected with a hydrogen PSA device through the shell side of the steam heat exchanger, a hydrogen outlet of the hydrogen PSA device and a hydrogen outlet of the water electrolysis device communicate with a hydrogen user, a stable and practical oxygen source can be provided for the high-temperature and high-pressure water-heat gasification technology, and meanwhile the problem of power demand of the water electrolysis hydrogen production process is solved.

Description

Technical Field

[0001] This invention belongs to the field of biomass / organic solid waste resource utilization technology, and relates to a biomass / organic solid waste hydrothermal gasification coupled with water electrolysis hydrogen-electric-thermal multi-generation system. Background Technology

[0002] With the growth of global energy demand and the intensification of environmental problems, the resource utilization of biomass and organic solid waste has become an important direction for sustainable development. Biomass resources and organic solid waste mainly include agricultural waste, forestry residues, municipal solid waste, and industrial organic waste. my country's annual total biomass resources are approximately 3 billion tons, and its annual production of organic solid waste is approximately 6 billion tons. Biomass resources and organic solid waste are abundant and widely distributed, and possess renewable characteristics, making them an important direction for developing a circular economy. However, the actual utilization rate is generally less than 50%. A large amount of resources are openly burned, landfilled, or directly discarded due to lagging treatment technologies or insufficient economic viability, leading to increased greenhouse gas emissions and soil and water pollution problems.

[0003] Traditional treatment technologies for biomass and organic solid waste include landfill, incineration, microbial fermentation, and pyrolysis. While these technologies have a certain application foundation, they have significant limitations. Landfilling of organic solid waste, though technically simple, consumes large amounts of land resources, and the resulting leachate may pollute groundwater and soil. Incineration treats biomass and organic solid waste through high-temperature combustion, using the heat to generate electricity or heat; however, incineration plants are expensive to build, and the pollutants require strict purification. Microbial fermentation can convert organic matter into methane or organic fertilizer, but this technology has a long production cycle, low product efficiency, and is difficult to treat organic solid waste with high moisture content or complex compositions. Pyrolysis heats organic matter under anaerobic or low-oxygen conditions to produce combustible gases, oil, and carbon; however, pyrolysis involves high reaction temperatures, slow rates, poor product selectivity, and high operating costs, limiting its widespread adoption.

[0004] In recent years, high-temperature and high-pressure hydrothermal gasification technology has gradually become a research hotspot in the utilization of biomass and organic solid waste due to its advantages of low reaction temperature, no pollution gas generation, and high conversion rate. This technology utilizes the highly diffusive, highly soluble, and highly reactive environment formed by water under high temperature and pressure conditions to convert various organic substances into hydrogen-rich gas. The nitrogen, sulfur, metal elements, and mineral ash contained in biomass and organic solid waste are discharged from the reaction system as ash residue because they do not undergo high-temperature oxidation during combustion. The mixed working fluid produced by high-temperature and high-pressure hydrothermal gasification technology has good workability and can be used for power generation. Waste heat can be recovered for heating, thus realizing combined hydrogen-power-heat production. However, the formation of the high-temperature and high-pressure hydrothermal environment requires the oxidation of the mixed working fluid to provide heat; therefore, a stable and affordable oxygen source supply is crucial for this technology.

[0005] Electrolysis of water to produce hydrogen is a technology that uses electrical energy to drive water molecules to undergo oxidation-reduction reactions at electrodes, generating hydrogen and oxygen. The entire electrolysis process produces no NO. x SO x While this technology generates pollutants, its main challenge lies in its massive electricity consumption. Coupled with renewable energy generation technologies, this is an effective way to address its electricity demand problem. Therefore, it is urgent to explore how to rationally arrange the high-temperature, high-pressure hydrothermal gasification process and the water electrolysis hydrogen production process to provide a stable and affordable oxygen source for the high-temperature, high-pressure hydrothermal gasification technology, solve the electricity demand problem of the water electrolysis hydrogen production process, and thus efficiently convert biomass and organic solid waste into clean energy, achieving energy cascade utilization and improving system economics. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a combined biomass / organic solid waste hydrothermal gasification coupled with water electrolysis hydrogen production system. This method can provide a stable and affordable oxygen source for high-temperature and high-pressure hydrothermal gasification technology, while solving the problem of power demand in the water electrolysis hydrogen production process.

[0007] To achieve the above objectives, this invention discloses a biomass / organic solid waste hydrothermal gasification coupled with water electrolysis hydrogen power generation system, including a high-temperature and high-pressure gasification reactor, a first mixed working fluid turbine, a first-stage oxidation reactor, a first-stage heat exchanger, a second-stage oxidation reactor, a second-stage heat exchanger, a second mixed working fluid turbine, a generator, a water electrolysis device, an oxygen pressurization device, and a hydrogen user.

[0008] The outlet of the high-temperature and high-pressure gasification reactor is connected to the inlet of the first mixed working fluid turbine. The outlet of the first mixed working fluid turbine is connected to the inlet of the first-stage oxidation reactor. The outlet of the first-stage oxidation reactor is connected to the inlet of the second-stage oxidation reactor via the shell side of the first-stage heat exchanger. The outlet of the second-stage oxidation reactor is connected to the inlet of the second mixed working fluid turbine via the shell side of the second-stage heat exchanger. The first and second mixed working fluid turbines are connected to a generator, and the output of the generator is connected to the power interface of the water electrolysis device. The oxygen outlet of the water electrolysis device is connected to the inlet of the first-stage oxidation reactor and the inlet of the second-stage oxidation reactor via an oxygen pressurization device. The hydrogen outlet of the water electrolysis device is connected to a hydrogen user.

[0009] A further improvement of the biomass / organic solid wastewater hydrothermal gasification coupled with water electrolysis hydrogen-electric-thermal polygeneration system of the present invention is as follows:

[0010] Furthermore, it also includes a slurry storage tank, the outlet of which is connected to the inlet of the high-temperature and high-pressure gasification reactor.

[0011] Furthermore, the outlet of the slurry storage tank is connected to the inlet of the high-temperature and high-pressure gasification reactor via a first ball valve and a slurry transport pump.

[0012] Furthermore, it also includes a cooler, a liquefaction separator, a water tank, and a hydrogen PSA unit;

[0013] The outlet of the second mixed working fluid turbine is connected to the inlet of the liquefaction separator via a cooler. The liquid outlet of the liquefaction separator is connected to the inlet of the water tank. The gaseous outlet of the liquefaction separator is connected to the inlet of the hydrogen PSA unit. The hydrogen outlet of the hydrogen PSA unit is connected to the hydrogen user.

[0014] Furthermore, the outlet of the water tank is connected to the inlet of the high-temperature and high-pressure gasification reactor via the tube side of the secondary heat exchanger and the tube side of the primary heat exchanger.

[0015] Furthermore, the outlet of the water tank is connected to the inlet of the high-temperature and high-pressure gasification reactor via the second ball valve, the preheating water pump, the tube side of the secondary heat exchanger, and the tube side of the primary heat exchanger.

[0016] The outlet of the water tank is connected to the water inlet of the water electrolysis device.

[0017] Furthermore, the outlet of the water tank is connected to the tube side of the steam heat exchanger to produce hot steam.

[0018] Furthermore, the first mixed working fluid turbine, the second mixed working fluid turbine, and the generator are arranged coaxially.

[0019] Furthermore, the first mixed working fluid turbine, the second mixed working fluid turbine, and the generator constitute a mixed working fluid turbine generator set. The number of the first mixed working fluid turbine and the number of the second mixed working fluid turbine in the mixed working fluid turbine generator set are adjusted according to the actual situation.

[0020] Furthermore, the primary oxidation reactor, primary heat exchanger, secondary oxidation reactor, and secondary heat exchanger constitute a multi-stage oxidation heat exchange system. The number of primary oxidation reactors, primary heat exchangers, secondary oxidation reactors, and secondary heat exchangers in the multi-stage oxidation heat exchange system are adjusted according to the actual situation.

[0021] The present invention has the following beneficial effects:

[0022] The biomass / organic solid waste hydrothermal gasification coupled with water electrolysis hydrogen and electricity multi-generation system of the present invention, in specific operation, couples high-temperature and high-pressure hydrothermal gasification technology with water electrolysis hydrogen and oxygen production technology. A first mixed working fluid turbine is added between the high-temperature and high-pressure gasification reactor and the multi-stage oxidation heat exchange system. The mixed working fluid first expands and depressurizes, and then undergoes an oxidation reaction in the multi-stage oxidation heat exchange system. Thus, the water electrolysis hydrogen production device provides a stable oxygen source for the high-temperature and high-pressure hydrothermal gasification technology. The mixed working fluid turbine group reduces the O2 pressure required by the multi-stage oxidation heat exchange system. The electricity produced by the mixed working fluid turbine group solves the energy demand problem of the water electrolysis device, realizes the thermodynamic cycle of the system, improves the economy and stability of the system, and solves the power demand problem of the water electrolysis hydrogen production process. Attached Figure Description

[0023] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0024] Figure 1 This is a structural diagram of the present invention.

[0025] Among them, 1 is a slurry storage tank, 2 is a first ball valve, 3 is a slurry transport pump, 4 is a high-temperature and high-pressure gasification reactor, 5 is a first mixed working fluid turbine, 6 is a water electrolysis device, 7 is an oxygen pressurization device, 8 is a primary oxidation reactor, 9 is a primary heat exchanger, 10 is a secondary oxidation reactor, 11 is a secondary heat exchanger, 12 is a second mixed working fluid turbine, 13 is a generator, 14 is a steam heat exchanger, 15 is a cooler, 16 is a liquefaction separator, 17 is a hydrogen PSA device, 18 is a hydrogen user, 19 is a water tank, 20 is a second ball valve, 21 is a preheating water pump, 22 is a mixed working fluid turbine generator set, and 23 is a multi-stage oxidation heat exchange system. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] In the description of this invention, it should be understood that the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0028] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0029] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Additionally, the character " / " in this invention generally indicates that the preceding and following objects have an "or" relationship.

[0030] It should be understood that although terms such as first, second, third, etc., may be used in the embodiments of the present invention to describe the preset range, these preset ranges should not be limited to these terms. These terms are only used to distinguish the preset ranges from one another. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0031] Depending on the context, the word "if" as used here can be interpreted as "when," "when," "in response to determination," or "in response to detection." Similarly, depending on the context, the phrase "if determination" or "if detection (of the stated condition or event)" can be interpreted as "when determination," "in response to determination," "when detection (of the stated condition or event)," or "in response to detection (of the stated condition or event)."

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0033] The accompanying drawings illustrate various structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0034] refer to Figure 1 The biomass / organic solid waste hydrothermal gasification coupled with water electrolysis hydrogen power generation system of the present invention includes a slurry storage tank 1, a first ball valve 2, a slurry transport pump 3, a high temperature and high pressure gasification reactor 4, a first mixed working fluid turbine 5, an electrolysis water device 6, an oxygen pressurization device 7, a primary oxidation reactor 8, a primary heat exchanger 9, a secondary oxidation reactor 10, a secondary heat exchanger 11, a second mixed working fluid turbine 12, a generator 13, a steam heat exchanger 14, a cooler 15, a liquefaction separator 16, a hydrogen PSA device 17, a hydrogen user 18, a water tank 19, a second ball valve 20, a preheating water pump 21, a mixed working fluid turbine generator set 22, and a multi-stage oxidation heat exchange system 23;

[0035] The outlet of the slurry storage tank 1 is connected to the inlet of the high-temperature and high-pressure gasification reactor 4 via the first ball valve 2 and the slurry transport pump 3. The outlet of the high-temperature and high-pressure gasification reactor 4 is connected to the inlet of the first mixed working fluid turbine 5. The outlet of the first mixed working fluid turbine 5 is connected to the inlet of the first-stage oxidation reactor 8. The outlet of the first-stage oxidation reactor 8 is connected to the inlet of the second-stage oxidation reactor 10 via the shell side of the first-stage heat exchanger 9. The outlet of the second-stage oxidation reactor 10 is connected to the inlet of the second mixed working fluid turbine 12 via the shell side of the second-stage heat exchanger 11. The outlet of the second mixed working fluid turbine 12 is connected to the inlet of the liquefaction separator 16 via the cooler 15. The liquid outlet of the liquefaction separator 16 is connected to the inlet of the water tank 19. The gaseous outlet of the liquefaction separator 16 is connected to the inlet of the hydrogen PSA unit 17. The hydrogen outlet of the hydrogen PSA unit 17 is connected to the hydrogen user 18.

[0036] The outlet of water tank 19 is connected to the inlet of high-temperature and high-pressure gasification reactor 4 via the second ball valve 20, preheating pump 21, the tube side of secondary heat exchanger 11 and primary heat exchanger 9. The outlet of water tank 19 is connected to the tube side of steam heat exchanger 14. The outlet of water tank 19 is connected to the inlet of water electrolysis device 6. The oxygen outlet of water electrolysis device 6 is connected to the inlet of primary oxidation reactor 8 and secondary oxidation reactor 10 via oxygen pressurization device 7. The hydrogen outlet of water electrolysis device 6 is connected to hydrogen user 18.

[0037] The first mixed working fluid turbine 5, the second mixed working fluid turbine 12, and the generator 13 are arranged coaxially, and the output end of the generator 13 is connected to the power interface of the water electrolysis device 6.

[0038] The first mixed working fluid turbine 5, the second mixed working fluid turbine 12, and the generator 13 constitute a mixed working fluid turbine generator set 22. The number of the first mixed working fluid turbine 5 and the number of the second mixed working fluid turbine 12 in the mixed working fluid turbine generator set 22 can be adjusted according to the actual situation.

[0039] The multi-stage oxidation heat exchange system 23 consists of a primary oxidation reactor 8, a primary heat exchanger 9, a secondary oxidation reactor 10, and a secondary heat exchanger 11. The number of primary oxidation reactors 8, primary heat exchangers 9, secondary oxidation reactors 10, and secondary heat exchangers 11 in the multi-stage oxidation heat exchange system 23 can be adjusted according to actual conditions.

[0040] The working principle of this invention is as follows:

[0041] The slurry input into the high-temperature and high-pressure gasification reactor 4 undergoes a gasification reaction under high temperature and high pressure conditions to generate a mixed working fluid containing components such as H2, CO2 and H2O.

[0042] The mixed working fluid expands and performs work in the first mixed working fluid turbine 5, reducing its temperature and pressure. It then enters the multi-stage oxidation heat exchange system 23 where it undergoes an oxidation reaction, releasing heat. The multi-stage heat exchanger acts as a heat exchange device, transferring heat from the mixed working fluid to the incoming preheated water in stages. The preheated water is heated to its rated temperature, and the temperature of the mixed working fluid decreases.

[0043] The mixed working fluid enters the second mixed working fluid turbine 12 for expansion and power generation, and the temperature of the mixed working fluid is further reduced.

[0044] The electricity generated by generator 13 is supplied to water electrolysis device 6 for hydrogen and oxygen production. The produced oxygen is supplied to the multi-stage oxidation reactor in multi-stage oxidation heat exchange system 23, where the oxidation of the mixed working fluid releases heat.

[0045] The mixed working fluid discharged from the second mixed working fluid turbine 12 enters the steam heat exchanger 14 to exchange heat with the steam supply water, and the temperature of the mixed working fluid is further reduced.

[0046] The mixed working fluid enters the cooler 15 to be cooled to the rated temperature, in preparation for subsequent separation and purification.

[0047] The mixed working fluid is separated into gas and liquid phases in the liquefaction separator 16. The gas phase component enters the hydrogen PSA unit 17, where it is purified to obtain high-purity H2, which is then supplied to the hydrogen user 18 together with the hydrogen obtained from water electrolysis.

[0048] The biomass / organic solid waste hydrothermal gasification coupled with water electrolysis hydrogen electrothermal polygeneration method of the present invention includes the following steps:

[0049] 1) Open water tank 19 and second ball valve 20. After being pressurized by preheating water pump 21, preheated water flows through the cold side working medium channel of multi-stage oxidation heat exchange system 23 and enters high temperature and high pressure gasification reactor 4. Water for steam supply flows through the cold side working medium channel of steam heat exchanger 14, and water for electrolysis enters water electrolysis device 6.

[0050] 2) Raise the temperature inside the high-temperature and high-pressure gasification reactor 4 to the reaction temperature, heat the preheated water inside the high-temperature and high-pressure gasification reactor 4 to the reaction temperature, and control the internal pressure of the high-temperature and high-pressure gasification reactor 4 to the reaction pressure through the mixed working fluid turbine generator set 22.

[0051] 3) Open the slurry storage tank 1 and the first ball valve 2. After being pressurized by the slurry transport pump 3, the slurry is pumped into the high-temperature and high-pressure gasification reactor 4. The slurry is completely gasified into gas in the high-temperature and high-pressure gasification reactor 4. The mixed working medium containing the gas generated by gasification and the preheated water enters the mixed working medium turbine generator set 22 to expand and generate electricity.

[0052] 4) After the mixed working fluid expands through the first mixed working fluid turbine 5, it enters the multi-stage oxidation heat exchange system 23. After partial oxidation and temperature increase, it exchanges heat with the preheated water in the cold side working fluid channel. The oxygen consumed by partial oxidation comes from the water electrolysis device 6, and the oxygen is pumped in through the oxygen pressurization device 7.

[0053] 5) The mixed working fluid discharged from the multi-stage oxidation heat exchange system 23 enters the second mixed working fluid turbine 12 and expands completely. Then it enters the hot side working fluid flow channel of the steam heat exchanger 14 and exchanges heat with the steam supply water. After exchanging heat with the steam supply water, it becomes product hot steam. The electricity generated by the mixed working fluid turbine generator set 22 is used for the electrolysis of water to produce hydrogen and oxygen in the water electrolysis device 6.

[0054] 6) The mixed working fluid discharged from the steam heat exchanger 14 enters the cooler 15 for cooling and then enters the liquefaction separator 16. The liquid phase in the liquefaction separator 16 flows back to the water tank 19, and the gas phase enters the hydrogen PSA unit 17. The hydrogen PSA unit 17 separates the hydrogen in the gas phase and supplies it to the hydrogen user 18. The remaining exhaust gas is rich in carbon dioxide and can be collected or further processed.

[0055] 7) The oxygen generated at the anode in the water electrolysis device 6 is pressurized to a certain pressure by the oxygen pressurizing device 7 and then introduced into the multi-stage oxidation heat exchange system 23 to provide an oxygen source for the oxidation reaction; the hydrogen generated at the cathode in the water electrolysis device 6 is supplied to the hydrogen user 18.

[0056] This invention has the following characteristics:

[0057] This invention couples high-temperature, high-pressure hydrothermal gasification technology with water electrolysis for hydrogen and oxygen production. It achieves combined hydrogen production, heating, and power generation by integrating a slurry storage tank 1, a high-temperature, high-pressure gasification reactor 4, a mixed-working-fluid turbine generator set 22, a multi-stage oxidation heat exchange system 23, a water electrolysis device 6, a steam heat exchanger 14, a liquefaction separator 16, a hydrogen PSA device 17, and a water tank 19. Oxygen is supplied from the coupled water electrolysis system, eliminating the need for an additional air separation system and reducing system equipment investment. The electricity generated by the mixed-working-fluid turbine generator set 22 supplies the energy consumed by the water electrolysis, solving the energy demand problem of the water electrolysis device 6 and improving the system's economy and stability.

[0058] In this invention, the multi-stage oxidation heat exchange system 23 utilizes the self-heating oxidation of biomass / organic solid waste gasification products through a multi-stage oxidation heat exchange arrangement, and effectively extracts energy within different temperature ranges to improve heat exchange efficiency and realize the system's thermodynamic cycle.

[0059] In this invention, the second mixed working fluid turbine 12 makes full use of the working capacity of the mixed working fluid, and the steam heat exchanger 14 extracts the waste heat of the system for heating, thereby reducing energy waste and improving the energy utilization efficiency of the system.

[0060] This invention effectively overcomes the difficulties of current high-temperature, high-pressure hydrothermal gasification and water electrolysis technologies by coupling high-temperature, high-pressure hydrothermal gasification technology with water electrolysis for hydrogen and oxygen production. A first mixed working fluid turbine 5 is added between the high-temperature, high-pressure gasification reactor 4 and the multi-stage oxidation heat exchange system 23. The mixed working fluid first expands and depressurizes before undergoing an oxidation reaction in the multi-stage oxidation heat exchange system 23. Thus, the water electrolysis hydrogen production device provides a stable oxygen source for the high-temperature, high-pressure hydrothermal gasification technology, the mixed working fluid turbine group reduces the O2 pressure required by the multi-stage oxidation heat exchange system, and the electricity generated by the mixed working fluid turbine group solves the energy demand problem of the water electrolysis device 6, realizing the system's thermodynamic cycle and improving the system's economy and stability.

[0061] In summary, this invention couples high-temperature, high-pressure hydrothermal gasification technology with water electrolysis for hydrogen and oxygen production. Oxygen is supplied from the coupled water electrolysis system, eliminating the need for an additional air separation system, thus reducing system equipment investment. The electricity generated by the mixed working fluid turbine generator set 22 supplies the energy consumed by the water electrolysis, solving the energy demand problem of the water electrolysis device 6 and improving the system's economy and stability. The expansion of the mixed working fluid within the first mixed working fluid turbine 5 reduces the internal pressure of the multi-stage oxidation heat exchange system 23, decreasing oxygen compression energy consumption and improving system economy. Through the multi-stage oxidation heat exchange arrangement, the system utilizes the self-heating oxidation of biomass / organic solid waste gasification products and effectively extracts energy at different temperatures, improving heat exchange efficiency and achieving system thermodynamic cycling. The second mixed working fluid turbine fully utilizes the work-capacity of the mixed working fluid, and the steam heat exchanger 14 extracts waste heat from the system for heating, reducing energy waste and improving system energy utilization efficiency. The materials used in this invention are widely applicable; any biomass / organic solid waste can be used as a material, realizing the resource utilization of biomass / organic solid waste.

[0062] Furthermore, it should be noted that the multi-stage oxidation heat exchange system 23 in this invention may include more oxidation reactors and heat exchangers. Based on the calorific value and other characteristics of the materials, it can perform rational staged oxidation and staged heat exchange according to the physical properties of the gasified fluid, thereby maximizing heat recovery. The mixed working fluid turbine generator set 22 of this invention may include more mixed working fluid turbines. Based on the calorific value and other characteristics of the materials, the expansion pressure can be rationally arranged to achieve efficient cascade utilization of energy.

[0063] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and disclosure of the invention. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0064] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

[0065] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A biomass / organic solid waste hydrothermal gasification coupled with water electrolysis hydrogen-electricity-thermal polygeneration system, characterized in that, It includes a high-temperature and high-pressure gasification reactor (4), a first mixed working fluid turbine (5), a first-stage oxidation reactor (8), a first-stage heat exchanger (9), a second-stage oxidation reactor (10), a second-stage heat exchanger (11), a second mixed working fluid turbine (12), a generator (13), an electrolysis water device (6), an oxygen pressurization device (7), and a hydrogen user (18). The outlet of the high-temperature and high-pressure gasification reactor (4) is connected to the inlet of the first mixed working fluid turbine (5). The outlet of the first mixed working fluid turbine (5) is connected to the inlet of the first-stage oxidation reactor (8). The outlet of the first-stage oxidation reactor (8) is connected to the inlet of the second-stage oxidation reactor (10) via the shell side of the first-stage heat exchanger (9). The outlet of the second-stage oxidation reactor (10) is connected to the inlet of the second mixed working fluid turbine (12) via the shell side of the second-stage heat exchanger (11). The first mixed working fluid turbine (5) and the second mixed working fluid turbine (12) are connected to the generator (13). The output end of the generator (13) is connected to the power interface of the water electrolysis device (6). The oxygen outlet of the water electrolysis device (6) is connected to the inlet of the first-stage oxidation reactor (8) and the inlet of the second-stage oxidation reactor (10) via the oxygen pressurization device (7). The hydrogen outlet of the water electrolysis device (6) is connected to the hydrogen user (18).

2. The biomass / organic solid waste hydrothermal gasification coupled with water electrolysis hydrogen electrothermal polygeneration system according to claim 1, characterized in that, It also includes a slurry storage tank (1), the outlet of which is connected to the inlet of the high-temperature and high-pressure gasification reactor (4).

3. The biomass / organic solid waste hydrothermal gasification coupled with water electrolysis hydrogen electrothermal multigeneration system according to claim 2, characterized in that, The outlet of the slurry storage tank (1) is connected to the inlet of the high-temperature and high-pressure gasification reactor (4) via the first ball valve (2) and the slurry transport pump (3).

4. The biomass / organic solid waste hydrothermal gasification coupled with water electrolysis hydrogen electrothermal multigeneration system according to claim 1, characterized in that, It also includes a cooler (15), a liquefaction separator (16), a water tank (19), and a hydrogen PSA unit (17); The outlet of the second mixed working fluid turbine (12) is connected to the inlet of the liquefaction separator (16) via the cooler (15). The liquid outlet of the liquefaction separator (16) is connected to the inlet of the water tank (19). The gaseous outlet of the liquefaction separator (16) is connected to the inlet of the hydrogen PSA unit (17). The hydrogen outlet of the hydrogen PSA unit (17) is connected to the hydrogen user (18).

5. The biomass / organic solid waste hydrothermal gasification coupled with water electrolysis hydrogen electrothermal multigeneration system according to claim 4, characterized in that, The outlet of the water tank (19) is connected to the inlet of the high-temperature and high-pressure gasification reactor (4) via the tube side of the secondary heat exchanger (11) and the tube side of the primary heat exchanger (9).

6. The biomass / organic solid waste hydrothermal gasification coupled with water electrolysis hydrogen electrothermal polygeneration system according to claim 4, characterized in that, The outlet of the water tank (19) is connected to the inlet of the high-temperature and high-pressure gasification reactor (4) via the second ball valve (20), the preheating water pump (21), the tube side of the secondary heat exchanger (11) and the tube side of the primary heat exchanger (9). The outlet of the water tank (19) is connected to the water inlet of the water electrolysis device (6).

7. The biomass / organic solid waste hydrothermal gasification coupled with water electrolysis hydrogen electrothermal multigeneration system according to claim 4, characterized in that, The outlet of the water tank (19) is connected to the tube side of the steam heat exchanger (14) and produces hot steam.

8. The biomass / organic solid waste hydrothermal gasification coupled with water electrolysis hydrogen-electric-thermal polygeneration system according to claim 1, characterized in that, The first mixed working fluid turbine (5), the second mixed working fluid turbine (12), and the generator (13) are arranged coaxially.

9. The biomass / organic solid waste hydrothermal gasification coupled with water electrolysis hydrogen electrothermal polygeneration system according to claim 1, characterized in that, The first mixed working fluid turbine (5), the second mixed working fluid turbine (12) and the generator (13) constitute a mixed working fluid turbine generator set (22). The number of the first mixed working fluid turbine (5) and the number of the second mixed working fluid turbine (12) in the mixed working fluid turbine generator set (22) are adjusted according to the actual situation.

10. The biomass / organic solid waste hydrothermal gasification coupled with water electrolysis hydrogen-electric-thermal polygeneration system according to claim 1, characterized in that, The primary oxidation reactor (8), primary heat exchanger (9), secondary oxidation reactor (10) and secondary heat exchanger (11) constitute a multi-stage oxidation heat exchange system (23). The number of primary oxidation reactors (8), primary heat exchangers (9), secondary oxidation reactors (10) and secondary heat exchangers (11) in the multi-stage oxidation heat exchange system (23) are adjusted according to the actual situation.

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