Off-grid comprehensive energy supply system with alcohol as energy carrier

Abstract

The embodiment of the invention relates to an off-grid comprehensive energy supply system with alcohol as an energy carrier. The off-grid comprehensive energy supply system comprises a hydrogen preparation system, a carbon dioxide preparation system and an alcohol preparation system, the hydrogen production system comprises a water electrolysis hydrogen production device, the hydrogen output end of the water electrolysis hydrogen production device is connected with the alcohol production system, and hydrogen is conveyed to the alcohol production system; the carbon dioxide preparation system comprises a biomass combustion device, and the biomass combustion device is connected with the oxygen output end of the water electrolysis hydrogen production device, receives oxygen and conveys carbon dioxide and first heat energy to the alcohol preparation system; the alcohol preparation system is used for synthesizing the hydrogen and the carbon dioxide into alcohol substances under the action of first heat energy; oxygen produced by the water electrolysis hydrogen production device provides an oxygen-enriched environment for the biomass combustion device, and the biomass combustion device provides a high-quality heat source and carbon dioxide for the alcohol preparation system, so that methanol and ethanol are generated, and integration of energy flow and substance flow is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy, in particular to an off-grid comprehensive energy supply system taking alcohol as an energy carrier. BACKGROUND

[0002] The inherent volatility of renewable resources such as wind and light makes it difficult to provide stable energy supply like thermal power generation, resulting in difficulty in realizing efficient grid connection, and the need to introduce other power production methods and energy storage media to smooth out fluctuations and improve energy quality.

[0003] Traditional electrochemical energy storage methods, physical energy storage methods, or energy storage density are not high, or require special topography support, or have low energy storage and release efficiency; and traditional hydrogen energy storage methods cannot avoid the problems of difficult hydrogen transportation, single downstream use, etc. SUMMARY

[0004] Embodiments of the present application provide an off-grid comprehensive energy supply system taking alcohol as an energy carrier to solve the technical problem of poor effect of traditional energy storage methods.

[0005] In a first aspect, embodiments of the present application provide an off-grid comprehensive energy supply system taking alcohol as an energy carrier, comprising: a hydrogen production system, a carbon dioxide production system, and an alcohol production system; wherein the hydrogen production system comprises a water electrolysis hydrogen production device, a hydrogen output end of the water electrolysis hydrogen production device is connected to the alcohol production system, and is used to deliver hydrogen to the alcohol production system; the carbon dioxide production system comprises a biomass combustion device, the biomass combustion device is connected to an oxygen output end of the water electrolysis hydrogen production device, and is used to receive oxygen and deliver carbon dioxide and first heat energy to the alcohol production system; and the alcohol production system is used to synthesize alcohol under the action of the first heat energy.

[0006] In some embodiments, a thermochemical hydrogen production device is further included; the thermochemical hydrogen production device is used to receive second heat energy delivered by the biomass fuel device, and produce hydrogen under the action of the second heat energy.

[0007] In some embodiments, the thermochemical hydrogen production device produces hydrogen based on at least one of the following systems: a metal halide system, a sulfur-containing system, and a hybrid cycle system.

[0008] In some embodiments, the hydrogen production system further comprises a power generation device, and the power generation device comprises a main power generation module and a secondary power generation module; wherein the main power generation module at least comprises a wind power generation module and a photovoltaic power generation module; the secondary power generation module at least comprises a hydroelectric power generation module and a nuclear power generation module; and the main power generation module and the secondary power generation module deliver electric energy to the water electrolysis hydrogen production device through an AC / DC conversion device.

[0009] In some embodiments, the hydrogen production system further comprises an energy storage device; the main power generation module and the secondary power generation module transmit electric energy to the energy storage device through an AC / DC conversion device for energy storage.

[0010] In some embodiments, the energy storage device is connected to the water electrolysis hydrogen production device for transmitting electric energy to the water electrolysis hydrogen production device.

[0011] In some embodiments, a first switch is arranged between the hydroelectric power generation module and the AC / DC conversion device, a second switch is arranged between the nuclear power generation module and the AC / DC conversion device, a third switch is arranged between the AC / DC conversion device and the energy storage device, and a fourth switch is arranged between the energy storage device and the water electrolysis hydrogen production device.

[0012] In some embodiments, the hydrogen production system further comprises a control system; the control system is configured to control the first switch, the second switch, and the fourth switch to be turned off and the third switch to be turned on to charge the energy storage device and the water electrolysis hydrogen production device to operate at the first rated power when the sum of the first real-time power output by the wind power generation module and the second real-time power output by the photovoltaic power generation module is not less than the first rated power of the water electrolysis hydrogen production device and the remaining electric quantity of the energy storage device is less than a first preset threshold.

[0013] In some embodiments, the control system is further configured to control the first switch, the second switch, the third switch, and the fourth switch to be turned off to enable the water electrolysis hydrogen production device to operate at the first rated power when the sum of the first real-time power and the second real-time power is not less than the first rated power and the remaining electric quantity of the energy storage device is equal to the first preset threshold.

[0014] In some embodiments, the control system is further configured to control the third switch and the fourth switch to be turned on and the first switch and the second switch to be turned off to enable the energy storage device to output the second rated power to the water electrolysis hydrogen production device and the water electrolysis hydrogen production device to operate at the first rated power when the sum of the first real-time power and the second real-time power is less than the first rated power, the sum of the first real-time power, the second real-time power, and the second rated power output by the energy storage device is not less than the first rated power, and the remaining electric quantity of the energy storage device is greater than a second preset threshold.

[0015] In some embodiments, the control system is further configured to, in the case that the sum of the first real-time power, the second real-time power, and the second rated power is less than the first rated power, control the first switch and the second switch to be closed, control the third switch and the fourth switch to be opened, control the secondary power generation module to output a third real-time power to the water electrolysis hydrogen production device, so that the water electrolysis hydrogen production device operates at the first rated power; wherein the third real-time power is the difference between the first rated power and the first real-time power and the second real-time power.

[0016] In some embodiments, the energy storage device comprises at least one of lithium ion battery energy storage, sodium ion battery energy storage, all-vanadium redox flow battery energy storage, flywheel energy storage, compressed air energy storage.

[0017] In some embodiments, the carbon dioxide production system further comprises a carbon dioxide purification device; an input end of the carbon dioxide purification device is connected with a carbon dioxide output end of the biomass combustion device, and an output end of the carbon dioxide purification device is connected with the alcohol production system.

[0018] In some embodiments, the carbon dioxide and hydrogen production system further comprises a carbon dioxide storage tank; a port of the carbon dioxide storage tank is connected with an output end of the carbon dioxide purification device, for storing carbon dioxide; the hydrogen production system further comprises a hydrogen storage tank, a port of the hydrogen storage tank is connected with a hydrogen output end of the water electrolysis hydrogen production device and a hydrogen output end of the thermochemical hydrogen production device, for storing hydrogen.

[0019] In some embodiments, the alcohol production system comprises a pretreatment device and an alcohol synthesis device; a first input end of the pretreatment device is connected with a port of the hydrogen storage tank, and a second input end of the pretreatment device is connected with a port of the carbon dioxide storage tank, for mixing and compressing the input hydrogen and carbon dioxide to obtain alcohol material; an output end of the pretreatment device is connected with an input end of the alcohol synthesis device, for delivering the alcohol material to the alcohol synthesis device, so that the alcohol synthesis device generates corresponding alcohol material.

[0020] In some embodiments, the alcohol synthesis device comprises at least one of a methanol synthesis device and an ethanol synthesis device; the methanol synthesis device or the ethanol synthesis device comprises a fixed bed reactor, and at least one of Cu, Zn, Zr, Al, and Pd-based catalysts is used to synthesize corresponding methanol or ethanol.

[0021] In some embodiments, the alcohol production system further comprises a refining device; the refining device is connected with an output end of the alcohol synthesis device, for refining the generated alcohol material.

[0022] In some embodiments, the alcohol production system further comprises a storage and transportation system, wherein the storage and transportation system is connected to the output end of the refining device and is used for transporting the refined alcohol.

[0023] In some embodiments, the alcohol production system further comprises a storage and transportation system, wherein the storage and transportation system is connected to the output end of the refining device and is used for transporting the refined alcohol.

[0024] In some embodiments, the electrolytic water hydrogen production device comprises at least one of the following: alkaline water electrolysis hydrogen production, proton exchange membrane water electrolysis hydrogen production, anion exchange membrane electrolytic water hydrogen production, and solid oxide electrolytic water hydrogen production.

[0025] The off-grid comprehensive energy supply system provided by the embodiments of the present application uses alcohol as an energy carrier, and comprises a hydrogen production system, a carbon dioxide production system, and an alcohol production system. BRIEF DESCRIPTION OF DRAWINGS

[0026] The accompanying drawings, which are incorporated into and form part of the description, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows: obviously, other drawings can also be obtained by those skilled in the art without any creative effort based on these drawings.

[0028] Figure 1A structural schematic diagram of an off-grid comprehensive energy supply system taking alcohol as an energy carrier provided by the embodiment of the present application;

[0029] Figure 2 A structural schematic diagram of a biomass combustion device provided by the embodiment of the present application;

[0030] Figure 3 A structural schematic diagram of a thermochemical hydrogen production device provided by the embodiment of the present application;

[0031] Figure 4 A structural schematic diagram of a hydrogen production system provided by the embodiment of the present application;

[0032] Figure 5 A structural schematic diagram of a carbon dioxide production system provided by the embodiment of the present application;

[0033] Figure 6 A structural schematic diagram of an alcohol synthesis system provided by the embodiment of the present application;

[0034] Figure 7 A structural schematic diagram of an alcohol application system provided by the embodiment of the present application;

[0035] Figure 8 A structural schematic diagram of another off-grid comprehensive energy supply system taking alcohol as an energy carrier provided by the embodiment of the present application;

[0036] Figure 9 A flowchart of a control method provided by the embodiment of the present application;

[0037] 10-hydrogen production system; 101-hydrogen production device by electrolysis of water; 102-thermochemical hydrogen production device; 103-wind power generation module; 104-photovoltaic power generation module; 105-hydropower generation module; 106-nuclear power generation module; 107-AC / DC conversion device; 108-energy storage device; 109-hydrogen storage tank; 20-carbon dioxide production system; 201-biomass combustion device; 202-carbon dioxide purification device; 203-carbon dioxide storage tank; 30-alcohol production system; 301-preprocessing device; 302-alcohol synthesis device; 303-refining device; 304-storage and transportation system; 40-alcohol application system. DETAILED DESCRIPTION

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 making creative efforts shall fall within the scope of protection of the present invention.

[0039] The inherent volatility of renewable resources such as wind and solar power makes it difficult for them to provide a stable energy supply like thermal power generation, resulting in difficulties in achieving efficient grid connection. Other electricity production methods and energy storage media need to be introduced to smooth out their fluctuations and improve energy quality.

[0040] Traditional electrochemical energy storage methods and physical energy storage methods have low energy storage density, require special terrain support, or have low energy storage and release efficiency; while traditional hydrogen energy storage methods cannot avoid problems such as difficulty in hydrogen transportation and single downstream use.

[0041] In response to the above technical problems, the technical concept of the present invention is: considering that methanol, ethanol, etc. can be obtained by reducing and hydrogenating carbon dioxide at high temperature and pressure, are liquid at room temperature, easy to transport, have high calorific value, are widely used fuels, and are also bulk chemical raw materials, which can be used for the production of various fine chemicals. Therefore, the present invention will utilize a hydrogen production system, a carbon dioxide production system, and an alcohol synthesis system to prepare alcohol substances such as methyl ethanol, thereby achieving quantitative conversion and quality improvement; at the same time, a biomass combustion module is also introduced to generate carbon dioxide and heat through oxygen-enriched combustion of biomass, wherein the carbon dioxide and heat energy can be used for the production of methyl ethanol, thereby maintaining stable production of methyl ethanol.

[0042] Figure 1 This is a schematic diagram of the structure of an off-grid integrated energy supply system using alcohol as an energy carrier provided by an embodiment of the present invention. Figure 1 As shown, the system includes a hydrogen production system 10, a carbon dioxide production system 20, and an alcohol production system 30;

[0043] In which, the hydrogen production system 10 includes a water electrolysis hydrogen production device 101, the hydrogen output end of the water electrolysis hydrogen production device 101 is connected to the alcohol production system 30, and is used to transport hydrogen to the alcohol production system 30; the carbon dioxide production system 20 includes a biomass combustion device 201, and the biomass combustion device 201 is connected to the oxygen output end of the water electrolysis hydrogen production device 101, and is used to receive oxygen and transport carbon dioxide and the first heat energy to the alcohol production system 30; the alcohol production system 30 is used to synthesize alcohol substances from the hydrogen and carbon dioxide under the action of the first heat energy.

[0044] Specifically, the water electrolysis hydrogen production device 101 comprises a hydrogen output end and an oxygen output end, wherein the hydrogen output end is connected to the alcohol production system 30 to provide hydrogen for alcohol (e.g., methanol) production, and the oxygen output end is connected to the biomass combustion device 201 so that the biomass in the biomass combustion device 201 is fully combusted in an oxygen-rich environment, and outputs carbon dioxide and heat energy to the alcohol production system 30; the alcohol production system 30 produces methanol by reducing hydrogen with carbon dioxide under the heat energy provided by the biomass combustion device 201.

[0045] In some embodiments, the water electrolysis hydrogen production device 101 comprises at least one of the following: alkaline water electrolysis hydrogen production, proton exchange membrane water electrolysis hydrogen production, anion exchange membrane water electrolysis hydrogen production, and solid oxide water electrolysis hydrogen production.

[0046] In this embodiment, the oxygen produced by the water electrolysis hydrogen production device 101 provides an oxygen-rich environment for the biomass combustion device 201, and the biomass combustion device 201 provides a high-quality heat source and carbon dioxide for the alcohol production system 30, thereby generating methanol; the process of generating methanol forms a closed loop, which can efficiently utilize the generated intermediates, and the generated methanol is liquid at room temperature, convenient to transport, has a high calorific value, is widely used as a fuel, and is also a bulk chemical raw material, which can be used for the production of various fine chemicals, thereby solving the technical problems that the traditional hydrogen energy storage method cannot avoid the difficulty of hydrogen transportation and the single downstream use.

[0047] In some embodiments, the system further comprises a thermochemical hydrogen production device 102; the thermochemical hydrogen production device 102 is configured to receive the second heat energy delivered by the biomass fuel device 201 and produce hydrogen under the action of the second heat energy.

[0048] In some embodiments, the thermochemical hydrogen production device 102 produces hydrogen based on at least one of the following systems: a metal halide system, a sulfur-containing system, and a hybrid cycle system.

[0049] Specifically, the oxygen-rich combustion of biomass produces carbon dioxide and heat, wherein the carbon dioxide and part of the heat energy can be used for methanol production, and the remaining heat energy can be used for hydrogen production by the thermochemical hydrogen production device 102; the thermochemical hydrogen production device 102 can use a metal halide system, a sulfur-containing system, and a hybrid cycle system, etc.

[0050] Figure 2 A structural schematic diagram of a biomass combustion device according to an embodiment of the present application is shown in FIG. 1. Figure 2As shown, the biomass combustion device 201 is provided with two heat exchangers, i.e., a first heat exchanger and a second heat exchanger, wherein the first heat exchanger is directly heated by the biomass oxygen-enriched combustion flame to obtain high-temperature water vapor 1 with a temperature exceeding 1300 degrees Celsius, which is used to supply the thermo-chemical hydrogen production device 102; the second heat exchanger is heated by flue gas to obtain high-temperature water vapor 2 with a temperature of about 500 degrees Celsius, which is used to supply the alcohol synthesis system 30; and the combustion-produced carbon dioxide is supplied to the carbon dioxide production system 20.

[0051] Figure 3 A structural schematic diagram of a thermo-chemical hydrogen production device according to an embodiment of the present application is shown in FIG. 2. Figure 3 As shown, a schematic diagram of the biomass combustion device 201 coupled with the thermo-chemical hydrogen production device 102 and the alcohol synthesis system 20 (methanol synthesis device) is shown in FIG. 3, and through step-by-step heat exchange, high-efficiency utilization of heat energy is realized.

[0052] Figure 4 A structural schematic diagram of a hydrogen production system according to an embodiment of the present application is shown in FIG. 4. Figure 4 As shown, the hydrogen production system 10 includes, in addition to the water electrolysis hydrogen production device 101 and the thermo-chemical hydrogen production device 102, a power generation device, wherein the power generation device includes a main power generation module and a secondary power generation module; the main power generation module at least includes a wind power generation module 103 and a photovoltaic power generation module 104; the secondary power generation module at least includes a hydraulic power generation module 105 and a nuclear power generation module 106; and the main power generation module and the secondary power generation module deliver electric energy to the water electrolysis hydrogen production device 101 through an AC / DC conversion device 107.

[0053] In some embodiments, the hydrogen production system 10 further includes an energy storage device 108; the main power generation module and the secondary power generation module deliver electric energy to the energy storage device 108 through the AC / DC conversion device 107, so as to realize energy storage.

[0054] In some embodiments, the energy storage device 108 is connected with the water electrolysis hydrogen production device 101, and is used to deliver electric energy to the water electrolysis hydrogen production device 101.

[0055] Specifically, the hydrogen production system 10 produces electricity by fluctuating energy sources such as wind power and photovoltaic power, and stable energy sources such as hydroelectric power and nuclear power. The wind power generation module 103 and the photovoltaic power generation module 104 can be 50 megawatts, the hydroelectric power generation module 105 and the nuclear power generation module 106 can be 25 megawatts, the energy storage device 108 can have an energy storage capacity of 100 megawatt-hours, and the water electrolysis hydrogen production device 101 can have a capacity of 30 megawatts. Thus, wind and light are the main power generation devices, and hydroelectric power and nuclear power are secondary power generation devices, mainly used to smooth the fluctuation of the power output curve of wind and light power generation. The alternating current generated by the power generation device is rectified into direct current by the AC / DC conversion device 107, and then enters the water electrolysis hydrogen production device 101 to produce hydrogen. The energy storage device 108 can also store electricity and provide electricity to the water electrolysis hydrogen production device 101. In addition, part of the nuclear power generation by-product heat can be used with the remaining heat energy of the biomass combustion device 201 to prepare hydrogen in the thermochemical hydrogen production device 102. In some embodiments, the energy storage device 108 includes at least one of the following: lithium ion battery energy storage, sodium ion battery energy storage, all-vanadium redox flow battery energy storage, flywheel energy storage, and compressed air energy storage.

[0056] In some embodiments, a first switch is provided between the hydroelectric power generation module 105 and the AC / DC conversion device 107, a second switch is provided between the nuclear power generation module 106 and the AC / DC conversion device 107, a third switch is provided between the AC / DC conversion device 107 and the energy storage device 108, and a fourth switch is provided between the energy storage device 108 and the water electrolysis hydrogen production device 101.

[0057] Specifically, with continued reference to Figure 4 As shown, a switch 1 is provided between the hydroelectric power generation module 105 and the AC / DC conversion device 107, a switch 2 is provided between the nuclear power generation module 106 and the AC / DC conversion device 107, a switch 3 is provided between the AC / DC conversion device 107 and the energy storage device 108, and a switch 4 is provided between the energy storage device 108 and the water electrolysis hydrogen production device 101. By opening or closing the switches 1-4, different modules can supply power to the water electrolysis hydrogen production device 101.

[0058] In some embodiments, the hydrogen production system 10 further includes a control system. When the sum of the first real-time power output by the wind power generation module 103 and the second real-time power output by the photovoltaic power generation module 104 is not less than the first rated power of the water electrolysis hydrogen production device 101, and the remaining power of the energy storage device 108 is less than a first preset threshold, the control system controls the first switch, the second switch, and the fourth switch to be open, and controls the third switch to be closed, so as to charge the energy storage device 108 and operate the water electrolysis hydrogen production device 101 at the first rated power.

[0059] Specifically, the hydrogen production system 10 further comprises a control system (not shown in the figure), which can realize different control logics of the hydrogen production system 10. Assuming that the rated power of the water electrolysis hydrogen production device 101 is Pe, the real-time power of the wind power generation module 103 is Pw, the real-time power of the photovoltaic power generation module 104 is Ps, the rated output power of the energy storage device 108 is Pc, and the first control logic is as follows:

[0060] ① When Pw+Ps≥Pe, and the remaining power (State of Charge, SOC) of the energy storage device 108 is less than the maximum value, the control switches 1, 2 and 4 are opened, and the control switch 3 is closed. At this time, the wind power generation module 103 and the photovoltaic power generation module 104 provide power for the energy storage device 108 and the water electrolysis hydrogen production device 101, so that the energy storage device 108 is in a charging state, and the water electrolysis hydrogen production device 101 operates at the rated power.

[0061] In some embodiments, the control system is further configured to control the first switch, the second switch, the third switch and the fourth switch to be opened when the sum of the first real-time power and the second real-time power is not less than the first rated power, and the remaining power of the energy storage device 108 is equal to the first preset threshold, so that the water electrolysis hydrogen production device 101 operates at the first rated power.

[0062] Specifically, the second control logic is as follows:

[0063] ② When Pw+Ps≥Pe, and the SOC of the energy storage device 108 is equal to the maximum value, the control switches 1, 2, 3 and 4 are opened. At this time, the wind power generation module 103 and the photovoltaic power generation module 104 provide power for the water electrolysis hydrogen production device 101, so that the water electrolysis hydrogen production device 101 operates at the rated power.

[0064] In some embodiments, the control system is further configured to control the third switch and the fourth switch to be closed, and control the first switch and the second switch to be opened when the sum of the first real-time power and the second real-time power is less than the first rated power, the sum of the first real-time power, the second real-time power and the second rated power output by the energy storage device 108 is not less than the first rated power, and the remaining power of the energy storage device 108 is greater than the second preset threshold, so that the energy storage device 108 outputs the second rated power to the water electrolysis hydrogen production device, and the water electrolysis hydrogen production device operates at the first rated power.

[0065] Specifically, the third control logic is as follows:

[0066] ③ When Pw+PsPe, and Pw+Ps+PcPe, and the SOC of the energy storage device 108 is greater than the minimum value, the switches 1 and 2 are controlled to be open, and the switches 3 and 4 are controlled to be closed, at this time, the wind power generation module 103, the photovoltaic power generation module 104 and the energy storage device 108 provide power for the water electrolysis hydrogen production device 101, wherein the energy storage device 108 supplies power to the water electrolysis hydrogen production device 101 at Pc, and the water electrolysis hydrogen production device 101 operates at the rated power.

[0067] In some embodiments, the control system is further configured to, in the case that the sum of the first real-time power, the second real-time power and the second rated power is less than the first rated power, control the first switch and the second switch to be closed, control the third switch and the fourth switch to be open, and control the secondary power generation module to output to the water electrolysis hydrogen production device 101 at a third real-time power, so that the water electrolysis hydrogen production device 101 operates at the first rated power; wherein the third real-time power is the difference between the first rated power and the first real-time power and the second real-time power.

[0068] Specifically, the fourth control logic is as follows:

[0069] ④ When Pw+Ps+PcPe, the switches 1 and 2 are controlled to be closed, and the switches 3 and 4 are controlled to be open, at this time, the wind power generation module 103, the photovoltaic power generation module 104, the hydroelectric power generation module 105 and the nuclear power generation module 106 supply power to the water electrolysis hydrogen production device 101, wherein the hydroelectric power generation module 105 and the nuclear power generation module 106 supply power to the water electrolysis hydrogen production device 101 at Pe-Pw-Ps, so that the water electrolysis hydrogen production device 101 operates at the rated power.

[0070] Figure 5 A structure diagram of a carbon dioxide production system provided by an embodiment of the present application is shown in Figure 5 As shown in the figure, the carbon dioxide production system 20 comprises a biomass combustion device 201 and a carbon dioxide purification device 202; the input end of the carbon dioxide purification device 202 is connected with the carbon dioxide output end of the biomass combustion device 201, and the output end of the carbon dioxide purification device 202 is connected with an alcohol production system 30.

[0071] Specifically, the biomass is fully oxygen-enriched and combusted in the biomass combustion device 201 to generate carbon dioxide, which then enters the carbon dioxide purification device 202 to remove ash, carbon monoxide and other impurities to obtain high-purity carbon dioxide; the carbon dioxide purification device 202 can remove ash by a bag-type dust collector or an electric dust collector, and can remove water vapor, carbon monoxide and oxygen in the carbon dioxide by using pressure swing adsorption, catalytic oxidation and other methods, and the purity of the obtained carbon dioxide can reach 99.99%; and then the purified carbon dioxide is input into the alcohol production system 30.

[0072] In some embodiments, the carbon dioxide hydrogen production system 10 further comprises a carbon dioxide storage tank 203; a port of the carbon dioxide storage tank 203 is connected with an output end of the carbon dioxide purification device 202, for storing carbon dioxide; the hydrogen production system 10 further comprises a hydrogen storage tank 109, a port of the hydrogen storage tank 109 is connected with a hydrogen output end of the water electrolysis hydrogen production device 101 and a hydrogen output end of the thermo-chemical hydrogen production device 102, for storing hydrogen.

[0073] Specifically, the hydrogen produced by the water electrolysis hydrogen production device 101 and the thermo-chemical hydrogen production device 102 can be stored in the hydrogen storage tank 109, and the high-purity carbon dioxide passing through the carbon dioxide production system 20 can be stored in the carbon dioxide storage tank 203, for subsequent use.

[0074] Figure 6 A structure schematic diagram of an alcohol synthesis system provided by an embodiment of the present application is shown in FIG. 3. Figure 6 As shown in FIG. 3, the alcohol production system 30 comprises a pretreatment device 301 and an alcohol synthesis device 302; a first input end of the pretreatment device 301 is connected with a port of the hydrogen storage tank 109, and a second input end of the pretreatment device 301 is connected with a port of the carbon dioxide storage tank 203, for mixing and compressing the input hydrogen and carbon dioxide, to obtain alcohol material; an output end of the pretreatment device 301 is connected with an input end of the alcohol synthesis device 302, for delivering the alcohol material to the alcohol synthesis device 302, so that the alcohol synthesis device 302 generates corresponding alcohol material.

[0075] In some embodiments, the alcohol synthesis device 302 comprises at least one of a methanol synthesis device and an ethanol synthesis device; the methanol synthesis device or the ethanol synthesis device comprises a fixed bed reactor, and at least one of Cu, Zn, Zr, Al and Pd-based catalyst is used to synthesize corresponding methanol or ethanol.

[0076] In some embodiments, the alcohol production system 30 further comprises a refining device 303; the refining device 303 is connected with an output end of the alcohol synthesis device 302, for refining the generated alcohol material.

[0077] In some embodiments, the alcohol production system 30 further comprises a storage and transportation system 304; the storage and transportation system 304 is connected with an output end of the refining device 303, for transporting the refined alcohol material.

[0078] Specifically, high-purity hydrogen is stored in the hydrogen storage tank 109, high-purity carbon dioxide is stored in the carbon dioxide storage tank 203, and after being compressed and mixed, the mixture is used as a raw material for methanol synthesis and ethanol synthesis; the biomass combustion device 201 provides heat, thereby producing methanol and ethanol; the methanol and ethanol synthesis device can adopt a fixed bed reactor and can adopt a Cu, Zn, Zr, Al, Pd-based catalyst; the produced methanol and ethanol are refined and then connected to the alcohol application system 30 through the storage and transportation system 304, wherein the storage and transportation system 304 can use vehicle transportation or pipeline transportation. Optionally, the methanol and ethanol synthesis device can reach 20,000 tons / year.

[0079] Figure 7 A structural schematic diagram of an alcohol application system provided by an embodiment of the present application is shown in FIG. 4, wherein the alcohol application system 40 is connected to the storage and transportation system 304; the alcohol application system 40 at least includes one of the following: an alcohol fuel device, a refining device, and a power generation device. Figure 7

[0080] Specifically, the produced methanol and ethanol are transported to an application end through the storage and transportation system 304, can be used as a bulk chemical raw material, can be directly used as fuel for a methanol automobile or an ethanol automobile, or can be used to generate electricity through a power generation device and then supply electric energy to an electric vehicle. The power generation device can be a combustion power generation device or an alcohol fuel cell power generation device.

[0081] Figure 8 A structural schematic diagram of another off-grid comprehensive energy supply system using alcohol as an energy carrier provided by an embodiment of the present application is shown in FIG. 5, wherein the system mainly includes a hydrogen production system 10, a carbon dioxide production system 20, an alcohol production system 30, and an alcohol application system 40, wherein the alcohol production system 30 mainly refers to a methanol and ethanol production system, and the alcohol application system 40 mainly refers to a methanol and ethanol application system. Figure 8

[0082] In summary, the off-grid comprehensive energy supply system constructed in the embodiment includes fluctuating and random energy generation modules such as wind and light and stable energy generation modules such as water and nuclear energy, and uses energy storage devices, hydrogen production devices, and methanol and ethanol preparation devices to realize energy conversion and quality improvement, and outputs clean methanol and ethanol to a user end for power generation, chemical use, and use of methanol and ethanol automobiles; the embodiment of the present application further introduces a biomass combustion module, produces carbon dioxide and heat through oxygen-enriched combustion of biomass, wherein the carbon dioxide and part of the heat can be used for production of methanol and ethanol, and the other remaining heat and part of the nuclear energy generated heat can be used to prepare hydrogen through a thermochemical method.

[0083] Figure 9 ​​A flowchart of a control method provided by an embodiment of the present application is applied to a control system in an off-grid comprehensive energy supply system taking alcohol as an energy carrier, as shown in the foregoing, and the control method comprises the following steps: Figure 9

[0084] In step S901, the first rated power of the water electrolysis hydrogen production device, the second rated power output by the energy storage device, the first real-time power output by the wind power generation module, the second real-time power output by the photovoltaic power generation module, and the SOC of the energy storage device are determined.

[0085] In step S902, if the sum of the first real-time power and the second real-time power is not less than the first rated power, and the remaining power of the energy storage device is less than the first preset threshold, the first switch, the second switch, and the fourth switch are controlled to be turned off, and the third switch is controlled to be turned on, so as to charge the energy storage device and make the water electrolysis hydrogen production device operate at the first rated power.

[0086] In step S903, if the sum of the first real-time power and the second real-time power is not less than the first rated power, and the remaining power of the energy storage device is equal to the first preset threshold, the first switch, the second switch, the third switch, and the fourth switch are all controlled to be turned off, so as to make the water electrolysis hydrogen production device operate at the first rated power.

[0087] In step S904, if the sum of the first real-time power and the second real-time power is less than the first rated power, the sum of the first real-time power, the second real-time power, and the second rated power is not less than the first rated power, and the remaining power of the energy storage device is greater than the second preset threshold, the third switch and the fourth switch are controlled to be turned on, and the first switch and the second switch are controlled to be turned off, so as to make the energy storage device output the second rated power to the water electrolysis hydrogen production device, and make the water electrolysis hydrogen production device operate at the first rated power.

[0088] In step S905, if the sum of the first real-time power, the second real-time power, and the second rated power is less than the first rated power, the first switch and the second switch are controlled to be turned on, the third switch and the fourth switch are controlled to be turned off, and the secondary power generation module is controlled to output the third real-time power to the water electrolysis hydrogen production device, so as to make the water electrolysis hydrogen production device operate at the first rated power; wherein the third real-time power is the difference between the first rated power and the first real-time power and the second real-time power.

[0089] In this embodiment, considering the inherent volatility of wind, light, and other renewable resources, it is difficult to provide stable energy supply like thermal power generation, which leads to difficulty in achieving efficient grid connection. By introducing other power production methods and energy storage media, the fluctuation is smoothed, the energy quality is improved, and the control logic is simple, which can realize stable production of alcohol.​

[0090] It has to be noted that, in the present document, the terms "first", "second", etc. merely serve the purpose of distinguishing between two entities or operations, without necessarily requiring or implying any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "containing" or any other transitional term, do not exclude other matters than the ones, listed in the respective claim, from being present in the composition, method, object or apparatus claimed. The singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. The term "comprises" or "comprising" as used herein does not exclude the presence of elements or steps other than those listed in a claim. The term "consisting of" excludes any element not specified in the claim.

[0091] The foregoing is considered as illustrative only of the principles of the application. Numerous modifications and changes will readily occur to those skilled in the art, which modifications and changes are to be understood as intended to be embraced by the principles described herein and fall within the scope of the application. Accordingly, all such variations are intended to be included within the scope of the application as described herein. The order of steps or blocks described in this specification is not necessarily the order in which the steps or blocks are performed. Rather, the various steps discussed previously can be performed in any order or simultaneously, as can be appreciated by one of skill in the art.

Claims

1. A stand-alone integrated energy supply system using alcohol as an energy carrier, characterized by, The system comprises: a hydrogen production system, a carbon dioxide production system, and an alcohol production system; the hydrogen production system comprises a water electrolysis hydrogen production device, and the hydrogen output end of the water electrolysis hydrogen production device is connected with the alcohol production system for delivering hydrogen to the alcohol production system; the carbon dioxide production system comprises a biomass combustion device, and the biomass combustion device is connected with the oxygen output end of the water electrolysis hydrogen production device for receiving oxygen and delivering carbon dioxide and first heat energy to the alcohol production system; the alcohol production system is used for synthesizing alcohol under the action of the first heat energy.

2. The system of claim 1, wherein, The system further comprises a thermochemical hydrogen production device; the thermochemical hydrogen production device is used for receiving second heat energy delivered by a biomass fuel device and producing hydrogen under the action of the second heat energy.

3. The system of claim 2, wherein, The thermochemical hydrogen production device produces hydrogen based on at least one of the following systems: a metal halide system, a sulfur-containing system, and a hybrid cycle system.

4. The system according to any of claims 1-3, characterized in that, The hydrogen production system further comprises a power generation device, and the power generation device comprises a main power generation module and a secondary power generation module; the main power generation module at least comprises a wind power generation module and a photovoltaic power generation module; the secondary power generation module at least comprises a hydroelectric power generation module and a nuclear power generation module; the main power generation module and the secondary power generation module deliver electric energy to the water electrolysis hydrogen production device through an AC / DC conversion device.

5. The system of claim 4, wherein, The hydrogen production system further comprises an energy storage device; the main power generation module and the secondary power generation module deliver electric energy to the energy storage device through an AC / DC conversion device for energy storage.

6. The system of claim 5, wherein, The energy storage device is connected with the water electrolysis hydrogen production device for delivering electric energy to the water electrolysis hydrogen production device.

7. The system of claim 6, wherein, A first switch is arranged between the hydroelectric power generation module and the AC / DC conversion device, a second switch is arranged between the nuclear power generation module and the AC / DC conversion device, a third switch is arranged between the AC / DC conversion device and the energy storage device, and a fourth switch is arranged between the energy storage device and the water electrolysis hydrogen production device.

8. The system of claim 7, wherein, The hydrogen production system further comprises a control system; when the sum of the first real-time power output by the wind power generation module and the second real-time power output by the photovoltaic power generation module is not less than the first rated power of the water electrolysis hydrogen production device, and the remaining electric quantity of the energy storage device is less than a first preset threshold, the control system controls the first switch, the second switch, and the fourth switch to be disconnected, and controls the third switch to be connected, so as to charge the energy storage device and make the water electrolysis hydrogen production device operate at the first rated power.

9. The system of claim 8, wherein, When the sum of the first real-time power and the second real-time power is not less than the first rated power, and the remaining electric quantity of the energy storage device is equal to the first preset threshold, the control system controls the first switch, the second switch, the third switch, and the fourth switch to be disconnected, so as to make the water electrolysis hydrogen production device operate at the first rated power.

10. The system of claim 8, wherein, The control system is further configured to control the third switch and the fourth switch to be closed, and control the first switch and the second switch to be opened, so that the energy storage device outputs to the water electrolysis hydrogen production device at the second rated power, and the water electrolysis hydrogen production device operates at the first rated power, when the sum of the first real-time power and the second real-time power is less than the first rated power, the sum of the first real-time power, the second real-time power and the second rated power output by the energy storage device is not less than the first rated power, and the remaining power of the energy storage device is greater than the second preset threshold.

11. The system of claim 8, wherein, The control system is further configured to control the first switch and the second switch to be closed, control the third switch and the fourth switch to be opened, and control the secondary power generation module to output to the water electrolysis hydrogen production device at the third real-time power, so that the water electrolysis hydrogen production device operates at the first rated power, when the sum of the first real-time power, the second real-time power and the second rated power is less than the first rated power. The third real-time power is the difference between the first rated power and the first real-time power and the second real-time power.

12. The system of claim 5, wherein, The energy storage device includes at least one of lithium ion battery energy storage, sodium ion battery energy storage, all-vanadium redox flow battery energy storage, flywheel energy storage, and compressed air energy storage.

13. The system of any one of claims 1-3, wherein, The carbon dioxide production system further comprises a carbon dioxide purification device. An input end of the carbon dioxide purification device is connected with a carbon dioxide output end of the biomass combustion device, and an output end of the carbon dioxide purification device is connected with the alcohol production system.

14. The system of claim 13, wherein, The carbon dioxide hydrogen production system further comprises a carbon dioxide storage tank. A port of the carbon dioxide storage tank is connected with an output end of the carbon dioxide purification device, and is used to store carbon dioxide. The hydrogen production system further comprises a hydrogen storage tank, a port of the hydrogen storage tank is connected with a hydrogen output end of the water electrolysis hydrogen production device and a hydrogen output end of the thermochemical hydrogen production device, and the hydrogen storage tank is used to store hydrogen.

15. The system of claim 14, wherein, The alcohol production system comprises a pretreatment device and an alcohol synthesis device. A first input end of the pretreatment device is connected with the port of the hydrogen storage tank, and a second input end of the pretreatment device is connected with the port of the carbon dioxide storage tank, and is used to mix and compress the input hydrogen and carbon dioxide to obtain alcohol material. An output end of the pretreatment device is connected with an input end of the alcohol synthesis device, and is used to deliver the alcohol material to the alcohol synthesis device, so that the alcohol synthesis device generates corresponding alcohol.

16. The system of claim 15, wherein, The alcohol synthesis device comprises at least one of a methanol synthesis device and an ethanol synthesis device. The methanol synthesis device or the ethanol synthesis device comprises a fixed bed reactor, and at least one of Cu, Zn, Zr, Al and Pd-based catalysts is used to synthesize corresponding methanol or ethanol.

17. The system of claim 15, wherein, The alcohol production system further comprises a refining device. The refining device is connected with an output end of the alcohol synthesis device, and is used to refine the generated alcohol.

18. The system of claim 17, wherein, The alcohol production system further comprises a storage and transportation system. The storage and transportation system is connected with an output end of the refining device, and is used to transport the refined alcohol.

19. The system of claim 18, wherein, The alcohol production system further comprises an alcohol application system, and the alcohol application system is connected with the storage and transportation system. The alcohol application system at least comprises one of the following: an alcohol fuel device, a refining device, and a power generation device.

20. The system of any one of claims 1-3, wherein, The water electrolysis hydrogen production device comprises at least one of the following: alkaline water electrolysis hydrogen production, proton exchange membrane water electrolysis hydrogen production, anion exchange membrane water electrolysis hydrogen production, and solid oxide water electrolysis hydrogen production.

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