Offshore wind power peak regulation system meeting peak load based on methanol synthesis

Abstract

The invention discloses an offshore wind power peak regulation system meeting peak load based on methanol synthesis, and relates to the technical field of energy, the offshore wind power peak regulation system comprises an offshore synthesis platform, the offshore synthesis platform comprises an automatic power generation frequency modulation device, a PEMFC hydrogen production system, a DMFC power supply system, a methanol synthesis system and a computer control system, the computer control system is used for being connected with and controlling the automatic power generation frequency modulation device, the PEMFC hydrogen production system, the DMFC power supply system and the methanol synthesis system, the automatic power generation frequency modulation device is used for scheduling the output direction of current, and the methanol synthesis system and the PEMFC hydrogen production system are used for controlling conversion between electric energy and methanol. And the DMFC power supply system is used for transmitting electric energy generated by methanol combustion to a power grid through the automatic power generation frequency modulation device. The impact on a power grid caused by unstable power generation of the offshore wind plant can be avoided, meanwhile, the base load with the low economic value is converted into methanol with the high economic value, and the income of the offshore wind plant is increased.

Description

Technical Field

[0001] The present invention relates to the field of energy technology, and in particular to an offshore wind power peak-shaving system based on methanol synthesis to meet peak loads. Background Art

[0002] As a renewable energy source for power generation, wind power has always been regarded as an effective way to alleviate the shortage of fossil energy. Compared with onshore wind farms, offshore wind farms do not occupy land resources, are basically not affected by topography, have higher wind speeds, have larger wind turbine capacity, and have higher annual utilization hours. However, the offshore environment is complex and harsh, and the output power of offshore wind turbines will fluctuate to a certain extent. If offshore wind power is directly transmitted to the power grid, it will have an impact on the power grid and affect the safe and reliable operation of the system. Solving this problem will not only help improve the operating efficiency of offshore wind power systems and reduce offshore wind abandonment rates, but also help to achieve a safe connection between the power grid and the offshore wind power system and enhance the stability of the power grid.

[0003] The main solution to the current instability of power generation in the power grid is peak shaving, and most of the existing research on peak shaving uses pumped storage as the research object, and few people have tried to achieve peak shaving through energy storage media such as methanol. Ying Weiyong et al. proposed a preparation method for peak shaving of coal-to-natural gas through methanol (publication number: CN201210504914), using a mixture of coal-to-purified gas and system circulating gas to selectively synthesize methane or methanol, thereby achieving peak shaving of the power grid. However, this design does not explain the timing of peak shaving, and coal-to-natural gas is mixed with more pollutants, which may cause harm to the environment. Therefore, existing research needs to pay more attention to achieving peak shaving of offshore power systems through energy storage media such as methanol, so as to achieve stable output of offshore wind power.

[0004] At the same time, the existing research on offshore wind power and methanol peak shaving has many problems such as single research objects and superficial research content. Few people have conducted cross-research on offshore wind power and methanol peak shaving as a whole. Cao Xi et al. proposed a methanol wastewater for wind power hydrogen production peak shaving and frequency regulation system (publication number: CN201910090724), which produces hydrogen by electrolyzing methanol in methanol wastewater from offshore wind power, thereby achieving peak shaving and frequency regulation. Although this design explains the peak shaving timing, it does not clearly define the device for achieving peak shaving, and the source of methanol wastewater is relatively limited. The methanol hydrogen production process is not as applicable as the hydrogen production methanol process. Therefore, the existing research needs to pay more attention to the improvement of the methanol process flow during the peak shaving process, and at the same time clarify the devices and equipment required in the peak shaving process, so as to increase the applicability and feasibility of the research content.

[0005] In addition, most existing studies focus on the implementation path of the peak-shaving mechanism, and few people try to apply the existing advanced computer systems to the peak-shaving process. Li Ziyong et al. proposed a methanol preparation system, a thermal power plant peak-shaving control method, device and computer equipment (publication number: CN202311059238). The system uses carbon dioxide generated in the power generation process of the thermal power plant as the basic raw material, and the waste heat generated by the thermal power plant as the energy source. Methanol is produced through the SOEC (Solid Oxide Electrolysis Cell, high-temperature solid oxide fuel cell) hydrogen production system and methanol synthesis system, and the peak-shaving process is realized through computer equipment. The design does not explain the specific composition of the methanol synthesis system, and does not elaborate on the regulation process of the methanol synthesis system by the computer system. In addition, fossil energy is non-renewable. Compared with coal-fired power plants, using offshore wind farms as energy sources is more conducive to the sustainable development of mankind. Therefore, existing research needs to pay more attention to how to apply computer control technology to the peak-shaving and frequency-regulating process of power grid connection, so as to improve the safety and stability of power grid operation while improving the efficiency of power grid operation.

[0006] In this context, it is considered to couple offshore wind power, peak load and methanol peak load regulation. Offshore wind power can use base load with lower economic value for methanol production while meeting the peak load demand of the power grid. If the power generation of the offshore wind farm is not enough to meet the peak load, the methanol fuel cell power generation can be regulated by computer equipment. The generated electricity is fed back to the power grid after frequency regulation, thus realizing peak load regulation and frequency regulation. This solution not only avoids the impact of unstable power generation of offshore wind farms on the power grid, but also converts base load with lower economic value into methanol with relatively higher economic value, thereby increasing the income of offshore wind farms. At the same time, the power generation process of offshore wind farms has zero carbon characteristics. Converting carbon dioxide captured on land into methanol through offshore wind farms can achieve a negative carbon effect, which helps humans cope with climate change. Summary of the invention

[0007] In view of the above shortcomings, the present invention provides an offshore wind power peak load regulation system based on methanol synthesis to meet peak load, which can avoid the impact of unstable power generation of offshore wind farms on the power grid, while converting base load with low economic value into methanol with relatively high economic value, thereby increasing the income of offshore wind farms. The specific technical scheme is as follows:

[0008] An offshore wind power peak-shaving system based on methanol synthesis to meet peak loads, comprising an offshore wind farm, a power grid, and a transport ship;

[0009] It also includes an offshore synthesis platform, which includes an automatic power generation and frequency modulation device, a PEMFC hydrogen production system, a DMFC power supply system, a methanol synthesis system and a computer control system. The computer control system is used to connect to the automatic power generation and frequency modulation device, the PEMFC hydrogen production system, the DMFC power supply system and the methanol synthesis system and control them respectively. The automatic power generation and frequency modulation device is used to dispatch the output direction of the current. The methanol synthesis system and the PEMFC hydrogen production system are used to control the conversion between electric energy and methanol. The DMFC power supply system is used to transmit the electric energy generated by the combustion of methanol to the power grid through the automatic power generation and frequency modulation device. The offshore synthesis platform is respectively connected to the offshore wind farm and the power grid, and directly transmits with the transport ship.

[0010] Preferably, the automatic power generation and frequency regulation device comprises a frequency sensor, a controller, an execution component, a communication module and a power supply, and the electric energy consumed by the automatic power generation and frequency regulation device is directly provided by the power grid;

[0011] The frequency sensor is used to collect frequency data of electric energy generated by the wind farm in real time and transmit the frequency data to the controller;

[0012] The controller is used to receive frequency data from the frequency sensor, perform logic calculations according to a preset frequency range and adjustment strategy, and issue corresponding instructions to the wind farm to adjust the output power of the wind farm;

[0013] The execution component is used to actually control the output power of the wind farm generator set, and to change the load or output power of the wind farm generator set by executing the control signal;

[0014] The communication module is used to exchange data and communicate with the wind farm generator set and other system components to ensure information transmission and coordination between various components;

[0015] The power supply is used to provide power support for the entire system.

[0016] Preferably, the PEMFC hydrogen production system comprises a water pump, a seawater desalination device, a water storage tank, a PEMFC hydrogen production reactor, a hydrogen purification device, an oxygen purification device, a hydrogen compression device, an oxygen compression device, a hydrogen storage tank and an oxygen storage tank;

[0017] The water pump is directly connected to the seawater desalination device and is used to extract seawater from the sea and transport the seawater to the seawater desalination device;

[0018] The seawater desalination device is directly connected to the water pump and the water storage tank to complete the desalination of the extracted seawater;

[0019] The water storage tank is directly connected to the seawater desalination device and the PEMFC hydrogen production reactor, and is used to store the obtained desalinated seawater;

[0020] The PEMFC hydrogen production reactor is connected to a hydrogen purification device and an oxygen purification device, and is used to electrolyze water in a water storage tank to produce hydrogen and oxygen;

[0021] The PEMFC hydrogen production reactor adopts proton exchange membrane electrolysis, and the electrolyte of the PEMFC hydrogen production reactor adopts acidic electrolyte; the anode material and cathode material of the PEMFC hydrogen production reactor are platinum and platinum alloy;

[0022] The electrochemical reaction occurring at the anode of the PEMFC hydrogen production reactor is: H2-2e - =2H + ; The electrochemical reaction at the cathode is: O2+4H + +4e - =2H2O; the overall electrochemical reaction is: 2H2+O2=2H2O;

[0023] The hydrogen purification device is connected to the PEMFC hydrogen production reactor and the hydrogen compression device, and is used to purify the hydrogen produced by the reaction and transport the purified hydrogen to the hydrogen compression device;

[0024] The oxygen purification device is connected to the PEMFC hydrogen production reactor and the oxygen compression device, and is used to purify the oxygen produced by the reaction and transport the purified oxygen to the oxygen compression device;

[0025] The hydrogen compression device is connected to the hydrogen purification device and the hydrogen storage tank, and is used to compress the purified hydrogen and transport the compressed hydrogen to the hydrogen storage tank;

[0026] The oxygen compression device is connected to the oxygen purification device and the oxygen storage tank, and is used for compressing the purified oxygen and transporting the compressed oxygen to the oxygen storage tank.

[0027] Preferably, the methanol synthesis system comprises a carbon dioxide vaporizer, a carbon dioxide storage tank, a carbon dioxide compressor, a hydrogen compressor, a methanol synthesis device, an auxiliary heating device, a methanol separator, a gas separation device, a methanol flash tank, a methanol distillation tower and a methanol storage tank;

[0028] The carbon dioxide vaporizer is connected to the carbon dioxide storage tank and is used to convert the liquid carbon dioxide transported by the transport ship into gaseous carbon dioxide;

[0029] The carbon dioxide storage tank is connected to the carbon dioxide vaporizer and is used to store the carbon dioxide obtained by gasification;

[0030] The hydrogen compressor is connected to the hydrogen storage tank and the methanol synthesis device and is used to compress the hydrogen used for the reaction;

[0031] The carbon dioxide compressor is connected to the carbon dioxide storage tank and the methanol synthesis device, and is used to compress the carbon dioxide involved in the reaction;

[0032] The methanol synthesis device is connected to a carbon dioxide compressor, a hydrogen compressor and a methanol separator to complete the preparation of methanol;

[0033] The chemical reaction formula occurring in the methanol synthesis device is: CO2+3H2=CH3OH+H2O, and the methanol synthesis device uses a copper-based catalyst;

[0034] The auxiliary heating device is connected to the methanol synthesis system and is used to convert electrical energy into thermal energy to provide an ambient temperature of 200-300 degrees Celsius for the methanol synthesis device;

[0035] The methanol separator is directly connected to the methanol synthesis device and is used to separate the liquid phase product and the gas phase product produced by the reaction;

[0036] The gas separation device is connected to the methanol separator, the water storage tank of the PEMFC hydrogen production system, the hydrogen compressor of the PEMFC hydrogen production system, and the carbon dioxide storage tank of the methanol synthesis system, and is used to separate different types of gases according to the differences in boiling points of gas phase products and transport them to their corresponding storage tanks;

[0037] The methanol flash tank is connected to the methanol separator and the methanol distillation tower, and is used to evaporate the crude methanol in the liquid phase product according to the difference in boiling points of different products;

[0038] The methanol distillation tower is connected to the methanol flash tank and the methanol storage tank, and is used to purify the crude methanol obtained from the methanol flash tank to obtain refined methanol with higher purity;

[0039] The methanol storage tank is connected to the methanol distillation tower and is used to store the produced refined methanol.

[0040] Preferably, the computer control system includes a command response module, a judgment module, a first control module and a second control module;

[0041] The command response module is used to issue commands for determining peak loads and issuing peak load and frequency regulation commands;

[0042] The judgment module is used to complete the judgment process of whether there is a peak load and whether additional power supply is needed;

[0043] The first control module is used to issue a peak load instruction and determine whether it is a peak load moment, and to order the execution of the second control module when the determination is established;

[0044] The second control module is used to issue peak-shaving instructions and determine whether it is a peak load moment. When it is determined that "offshore wind turbine power generation > grid demand", the PEMFC hydrogen production system and the methanol synthesis system are started; when it is determined that "offshore wind turbine power generation < grid demand", the power to be adjusted is first determined, and the DMFC power supply system is started. After completing the frequency regulation of the electricity generated by the offshore wind farm and the electricity generated by the DMFC power supply system, the power grid is supplemented with electricity to meet the peak load demand of the grid.

[0045] Preferably, it also includes a signal detector, a storage medium, a memory, an instruction executor, and a power supply component;

[0046] The signal detector is directly connected to the power grid, and is used to display the current load of the power grid, and to determine whether the current offshore wind turbine power generation is at peak load through a specific algorithm. The signal detector can also determine the required peak load regulation power and issue frequency regulation instructions based on the power supply situation of the power grid;

[0047] The memory is used to store application programs involved in the operation of the first control module and the second control module;

[0048] The command executor is used to execute the above-mentioned judgment and command execution process;

[0049] The storage medium is used to store computer instructions so that the computer can continue the peak load regulation process when no one is operating;

[0050] The power supply component is directly connected to the signal detector, storage medium, memory, and instruction executor, and is used to provide the electrical energy consumed by the above-mentioned devices when they are working.

[0051] Preferably, it also includes a peak load shaving and frequency modulation operation to meet the peak load, and the peak load shaving and frequency modulation operation to meet the peak load includes:

[0052] Executing the first control module, responding to the instruction to determine the peak load, if it is determined that the current time is not the peak load, then ordering all the electricity generated by the offshore wind farm to be used for methanol production; if it is determined that the current time is the peak load, then ordering the execution of the second control module;

[0053] The second control module is executed to confirm the power to be adjusted during the peak load regulation process. If the power generation of the offshore wind farm meets the peak load demand at this time, the electric energy generated by the offshore wind farm will be supplied to the power grid after frequency regulation by the automatic power generation and frequency regulation device, and the remaining electric energy after meeting the peak load will be used for methanol preparation; if the power generation of the offshore wind farm is not enough to meet the peak load demand at this time, the second control module is first commanded to determine the power to be adjusted, and the DMFC power supply system is ordered to start working, and electric energy is generated by the DMFC power supply system, and the electric energy generated by the DMFC power supply system and the offshore wind farm is adjusted to the input frequency of the power grid through the automatic power generation and frequency regulation device, so as to supplement electric energy to the power grid to meet the peak load demand.

[0054] Preferably, the DMFC power supply system comprises a DMFC power supply device, a gas separation device and a power supply center;

[0055] The DMFC power supply device is connected to the PEMFC hydrogen production system and the methanol synthesis system to realize the electrochemical reaction of methanol and oxygen;

[0056] The DMFC power supply device adopts a proton exchange membrane; the electrolyte of the DMFC power supply device adopts an acidic electrolyte; the anode electrode material and the cathode electrode material of the DMFC power supply device are both carbon black; the DMFC power supply device adopts platinum as its anode catalyst; the DMFC power supply device adopts a carbon-platinum alloy as its cathode catalyst;

[0057] The electrochemical reaction occurring at the anode of the DMFC power supply device is: CH3OH+H2O-6e - =CO2+6H + ; The electrochemical reaction at the cathode is: O2+4H + +4e - =2H2O; the total electrochemical reaction of the DMFC power supply device is: 2CH3OH+3O2=2CO2+4H2O;

[0058] The gas separator is connected to the PEMFC hydrogen production system and the methanol synthesis system, and is used to separate different types of gases according to the difference in boiling points of gas phase products and transport them to their corresponding storage tanks;

[0059] The power supply center is connected to the power grid, the DMFC power supply device, and the computer control system, and is used to coordinate the power consumption of the DMFC power supply device and feed back the electric energy generated by the DMFC power supply device to the power grid;

[0060] The DMFC power supply system starts working only after the computer control system issues a peak load regulation instruction.

[0061] Preferably, the automatic power generation and frequency modulation device, PEMFC hydrogen production system, methanol synthesis system and computer control system are directly connected to the power grid, and the consumed electric energy is directly provided by the power grid.

[0062] Preferably, the transport ship can be used to transport carbon dioxide, oxygen by-product and methanol product.

[0063] Compared with the prior art, the present invention has the following beneficial effects:

[0064] 1. The present invention can further enhance the profitability of offshore wind farms by converting base load electricity with poor economic efficiency into methanol products and oxygen byproducts with high economic value, thereby bringing more economic benefits to offshore wind farms.

[0065] 2. The raw materials used in the present invention can be obtained through a wide range of channels and at a low cost. At the same time, the hydrogen used in the present invention for producing methanol is essentially derived from seawater, and has almost no acquisition cost. In addition, the device structure for producing methanol and peak regulation in the present invention is simple, and the PEMFC hydrogen production system and DMFC power supply system used in the production process are mature in technology and have been widely used in different fields. Therefore, the present invention has a low application difficulty and is suitable for large-scale promotion and application.

[0066] 3. The present invention realizes the temporal and spatial translation of electric energy through methanol peak shaving, effectively controls the output power of the wind farm, and maximizes the economic value of offshore wind power under the premise of ensuring the stable output of wind power. At the same time, methanol peak shaving also helps to increase the stability of power grid operation.

[0067] 4. The present invention proposes a computer system for methanol synthesis and grid peak regulation. By applying different modules to the computer system, the operating efficiency of the system is increased, so that the offshore wind power system can also achieve methanol synthesis and grid peak regulation when no one is operating.

[0068] 5. There is almost no carbon dioxide emission during the construction and operation of the offshore wind farm of the present invention. By coupling the methanol synthesis system to produce methanol, negative carbon emissions of the entire system can be achieved, making the present invention highly environmentally friendly and in line with the theme of the current era. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0070] Figure 1 This is a schematic diagram of the structure of the offshore wind power peak regulation system of the present invention;

[0071] Figure 2This is a connection diagram of the offshore wind power peak regulation system of the present invention;

[0072] Figure 3 It is a control structure diagram of the computer control system of the present invention;

[0073] Figure 4 It is a structural diagram of the computer control system of the present invention. DETAILED DESCRIPTION

[0074] The technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0075] The technical problem to be solved and the technical task proposed by the present invention is to propose a peak-shaving and frequency-regulating scheme for offshore wind farms, and to provide an offshore wind power peak-shaving system based on methanol synthesis to meet peak loads, so as to achieve the purpose of using methanol to complete peak-shaving and frequency regulation and obtain economic benefits. To this end, the present invention adopts the following technical scheme.

[0076] like Figure 1 As shown, an offshore wind power peak-shaving system based on methanol synthesis to meet peak load mainly includes four subsystems: PEMFC (Proton Exchange Membrane Fuel Cell) hydrogen production system, DMFC (Direct Methanol Fuel Cell) power supply system, methanol synthesis system, and computer control system.

[0077] As the center of the entire offshore wind power peak regulation system, the computer control system is directly connected to other systems and controls the working status of other systems. When the computer control system detects that the power consumption end is at peak charge, the electric energy of the offshore wind farm is preferentially modulated by the automatic power generation and frequency modulation device and then dispatched to the power grid. If the power generation of the offshore wind farm is sufficient to meet the power demand of the power grid, the PEMFC hydrogen production system and the methanol synthesis system are ordered to start working, and the surplus electric energy generated by the offshore wind farm is converted into methanol products; if the power generation of the offshore wind farm is not enough to meet the power demand of the power grid, the DMFC power supply system is ordered to start working. The DMFC power supply system uses the methanol produced by the methanol synthesis system and the oxygen produced by the PEMFC hydrogen production system as raw materials to generate electric energy through the methanol combustion reaction. The generated electric energy is finally regulated by the automatic power generation and frequency modulation device under the control of the computer control system and supplied to the power grid, so that the power generation of the offshore wind farm can meet the power demand of the power consumption end. If the computer control system detects that the power consumption end is at base load, the PEMFC hydrogen production system and the methanol synthesis system are ordered to start working, and all the power generation of the offshore wind farm is converted into methanol products.

[0078] The PEMFC hydrogen production system, DMFC power supply system, methanol synthesis system and computer control system involved in the offshore wind power peak-shaving system are all located on the same offshore synthesis platform. The computer control system contains a storage medium for storing the system's operating program, allowing the offshore synthesis platform to continue to operate without human operation. In addition to the above four systems, the offshore synthesis platform also has the following features: direct connection to offshore wind turbines, direct connection to the power grid, direct connection to carbon dioxide transport ships, and direct connection to methanol transport ships.

[0079] The automatic power generation and frequency regulation device described in the figure is mainly composed of five parts: frequency sensor, controller, actuator, communication module, and power supply. It is directly connected to the power grid, wind farm and computer control system, and the consumed electric energy is directly provided by the power grid.

[0080] The functions of each component of the automatic power generation and frequency regulation device are as follows:

[0081] Frequency sensor: collects frequency data of the electricity generated by the wind farm in real time and transmits this data to the controller.

[0082] Controller: Responsible for receiving frequency data from the frequency sensor and performing logical calculations based on the preset frequency range and adjustment strategy. The controller will issue corresponding instructions to the generator set of the wind farm according to the size and direction of the frequency deviation, thereby adjusting the output power of the wind farm.

[0083] Actuators: Actuators include various actuators and devices that are used to actually control the output power of wind farm generators. These actuators may include speed governors, regulating valves, etc., which change the load or output power of wind farm generators by executing control signals.

[0084] Communication module: The communication module is used to exchange data and communicate with the wind farm generator set and other system components to ensure information transmission and coordination between various components.

[0085] Power supply part: Provides stable power supply for the normal operation of automatic power generation and frequency regulation device. The power consumed by the power supply part comes directly from the power grid. The power supply part usually includes power converter, battery pack and other equipment to provide power support for the entire system.

[0086] The source of carbon dioxide required for synthesizing methanol is: it is collected and processed by industries with large carbon emissions such as coal-fired power plants on land, and then transported to ocean-going ships, which are then transported to offshore synthesis platforms.

[0087] The oxygen that does not ultimately participate in peak regulation in the PEMFC hydrogen production system and the methanol that does not ultimately participate in peak regulation in the methanol synthesis system can both be transported to land as by-products of the offshore wind power peak regulation system by ocean-going vessels that transport carbon dioxide and sold to obtain economic value.

[0088] The ship that transports carbon dioxide and methanol is the same ship. After delivering liquid carbon dioxide, the ship that transports carbon dioxide needs to wait near the offshore synthesis platform until the oxygen byproduct and methanol product are filled before leaving.

[0089] like Figure 2 As shown, Figure 2 Shown is a connection diagram of an offshore wind power peak-shaving system based on methanol synthesis to meet peak loads.

[0090] (1) PEMFC hydrogen production system

[0091] The PEMFC hydrogen production system needs to include a water pump, a seawater desalination device, a water storage tank, a PEMFC hydrogen production reactor, a hydrogen purification device, an oxygen purification device, a hydrogen compression device, an oxygen compression device, a hydrogen storage tank, and an oxygen storage tank.

[0092] The water pump is directly connected to the desalination device and is used to extract seawater from the sea and transport the seawater to the desalination device.

[0093] The desalination device is directly connected to the water pump and the water storage tank to complete the desalination of the extracted seawater.

[0094] The water storage tank is directly connected to the seawater desalination device and the PEMFC hydrogen production reactor and is used to store the obtained desalinated seawater.

[0095] The PEMFC hydrogen production reactor is connected to the hydrogen purification device and the oxygen purification device, and is used to electrolyze water in the water storage tank to produce hydrogen and oxygen.

[0096] The PEMFC hydrogen production reactor uses proton exchange membrane electrolysis because this type of reactor is more adaptable to intermittent energy. The electrolyte of the PEMFC hydrogen production reactor uses an acidic electrolyte. The anode material of the PEMFC hydrogen production reactor is platinum or its alloys, such as platinum-palladium alloy. These materials have good catalytic properties and can promote the oxidation reaction of hydrogen. The cathode material of the PEMFC hydrogen production reactor is platinum or its alloys, such as platinum-rhodium alloy. These materials have good catalytic properties and can promote the reduction reaction of oxygen.

[0097] The electrochemical reaction at the anode of the PEMFC hydrogen production reactor is: H2-2e - =2H + ; The electrochemical reaction at the cathode is: O2+4H + +4e - =2H2O; the overall electrochemical reaction is: 2H2+O2=2H2O.

[0098] The hydrogen purification device is connected to the PEMFC hydrogen production reactor and the hydrogen compression device, and is used to purify the hydrogen produced by the reaction and transport the purified hydrogen to the hydrogen compression device.

[0099] The oxygen purification device is connected to the PEMFC hydrogen production reactor and the oxygen compression device, and is used to purify the oxygen produced by the reaction and transport the purified oxygen to the oxygen compression device.

[0100] The hydrogen compression device is connected to the hydrogen purification device and the hydrogen storage tank, and is used to compress the purified hydrogen and transport the compressed hydrogen to the hydrogen storage tank.

[0101] The oxygen compression device is connected to the oxygen purification device and the oxygen storage tank, and is used for compressing the purified oxygen and transporting the compressed oxygen to the oxygen storage tank.

[0102] The PEMFC hydrogen production system is directly connected to the power grid, and the electricity consumed during operation is directly provided by the power grid.

[0103] (2) Methanol synthesis system

[0104] The methanol synthesis system should include a carbon dioxide vaporizer, a carbon dioxide storage tank, a carbon dioxide compressor, a hydrogen compressor, a methanol synthesis unit, an auxiliary heating unit, a methanol separator, a gas separation unit, a methanol flash tank, a methanol distillation tower, and a methanol storage tank.

[0105] The carbon dioxide vaporizer is connected to the carbon dioxide storage tank and is used to convert the liquid carbon dioxide transported by the ship into gaseous carbon dioxide.

[0106] The carbon dioxide storage tank is connected to the carbon dioxide vaporizer and is used to store the carbon dioxide obtained by gasification.

[0107] The hydrogen compressor is connected to the hydrogen storage tank and the methanol synthesis unit and is used to compress hydrogen for the reaction.

[0108] The carbon dioxide compressor is connected to the carbon dioxide storage tank and the methanol synthesis device, and is used to compress the carbon dioxide involved in the reaction.

[0109] The methanol synthesis unit is connected to a carbon dioxide compressor, a hydrogen compressor and a methanol separator to complete the preparation of methanol.

[0110] The chemical reaction formula occurring in the methanol synthesis unit is: CO2+3H2=CH3OH+H2O. The reaction requires high temperature and a catalyst as conditions.

[0111] Methanol synthesis units use copper-based catalysts to improve the efficiency and selectivity of the reaction.

[0112] The auxiliary heating device is connected to the methanol synthesis system and is used to convert electrical energy into thermal energy to provide an ambient temperature of 200-300 degrees Celsius for the methanol synthesis device.

[0113] The methanol separator is directly connected to the methanol synthesis unit and is used to separate the liquid phase product and the gas phase product produced by the reaction.

[0114] The gas separation device is connected to the methanol separator, the water storage tank of the PEMFC hydrogen production system, the hydrogen compressor of the PEMFC hydrogen production system, and the carbon dioxide storage tank of the methanol synthesis system. It is used to separate different types of gases according to the differences in the boiling points of the gas phase products and transport them to their corresponding storage tanks, thereby realizing the recycling of raw materials.

[0115] The methanol flash tank is connected to the methanol separator and the methanol distillation tower. Its function is to evaporate the methanol in the liquid product according to the difference in boiling points of different products. The methanol with lower purity produced here is called crude methanol.

[0116] The methanol distillation tower is connected to the methanol flash tank and the methanol storage tank, and is used to purify the crude methanol obtained from the methanol flash tank to obtain methanol with higher purity. The methanol with higher purity obtained here is called refined methanol.

[0117] The methanol storage tank is connected to the methanol distillation tower and is used to store the produced refined methanol.

[0118] The methanol synthesis system is directly connected to the power grid, and the electricity consumed by the devices in the synthesis system is directly provided by the power grid.

[0119] (3) Computer control system

[0120] The computer control system includes four parts: an instruction response module, a judgment module, a first control module and a second control module.

[0121] The command response module is used to issue commands for determining peak loads and for issuing peak load and frequency regulation commands.

[0122] The judgment module is used to complete the judgment process of whether there is a peak load and whether additional power supply is needed.

[0123] The first control module includes the issuance and judgment process of the peak load instruction, and when it is judged that "this is the peak load", it orders the execution of the second control module.

[0124] The second control module includes the issuance and judgment process of the peak load regulation command. When it is judged that "the power generated by the offshore wind turbine is greater than the power grid demand", the frequency regulation and methanol production process are executed; when it is judged that "the power generated by the offshore wind turbine is less than the power grid demand", the power to be regulated is first determined, and the DMFC power supply system is ordered to work, and then the power generated by the offshore wind farm and the power generated by the DMFC power supply system are frequency regulated together, and the power grid is supplemented with power to meet the peak load demand of the power grid.

[0125] It also includes a signal detector, a storage medium, a memory, an instruction executor, and a power supply component.

[0126] The signal detector is directly connected to the power grid to display the current load of the power grid and determine whether the current offshore wind turbine power generation is at peak load through a specific algorithm. The signal detector can also determine the required peak load and issue frequency regulation instructions based on the power supply situation of the power grid.

[0127] The memory is used to store application programs involved in the operation of the first control module and the second control module.

[0128] The instruction executor is used to execute the above-mentioned judgment and command execution process.

[0129] The storage medium is used to store computer instructions so that the computer can continue the peak load regulation process when no one is operating.

[0130] The power supply component is directly connected to the signal detector, storage medium, memory, and instruction executor, and is used to provide the electrical energy consumed by the above-mentioned devices when they are working.

[0131] The electrical energy consumed by the power supply components is provided directly from the power grid.

[0132] (4) Peak load regulation and frequency regulation operations to meet peak loads include:

[0133] The first control module is executed to respond to the instruction to determine the peak load. If it is determined that it is not the peak load at this time, an order is issued to use all the electricity generated by the offshore wind farm for methanol production. If it is determined that it is the peak load at this time, an order is issued to execute the second control module.

[0134] Execute the second control module to confirm the power to be adjusted during the peak load regulation process. If the power generation of the offshore wind farm meets the peak load demand at this time, the electric energy generated by the offshore wind farm will be supplied to the power grid after the frequency regulation is completed by the automatic power generation and frequency regulation device, and the remaining electric energy after meeting the peak load will be used for methanol preparation. If the power generation of the offshore wind farm is not enough to meet the peak load demand at this time, first command the second control module to determine the power to be adjusted, and order the DMFC power supply system to start working, generate electric energy through the DMFC power supply system, and adjust the electric energy generated by the DMFC power supply system and the offshore wind farm to the input frequency of the power grid through the automatic power generation and frequency regulation device, and supplement the power grid with electric energy to meet the peak load demand.

[0135] (5)DMFC power supply system

[0136] The DMFC power supply system consists of a DMFC power supply device, a gas separation device, and a power supply center.

[0137] The DMFC power supply device is connected to the oxygen storage tank of the PEMFC hydrogen production system, the methanol storage tank of the methanol synthesis system, and the gas separation device to realize the electrochemical reaction of methanol and oxygen.

[0138] The DMFC power supply device adopts a proton exchange membrane; the electrolyte of the DMFC power supply device adopts an acidic electrolyte; the anode electrode material and the cathode electrode material of the DMFC power supply device are both carbon black; the DMFC power supply device adopts platinum as its anode catalyst, because platinum has good catalytic activity and stability for methanol oxidation reaction, and can effectively promote the oxidation process of methanol; the DMFC power supply device adopts a carbon-platinum alloy as its cathode catalyst, because the carbon-platinum alloy has excellent stability and oxygen reduction activity.

[0139] The electrochemical reaction at the anode of the DMFC power supply device is: CH3OH+H2O-6e - =CO2+6H + ; The electrochemical reaction at the cathode of the DMFC power supply device is: O2+4H + +4e - =2H2O; the total electrochemical reaction occurring in the DMFC power supply device is: 2CH3OH+3O2=2CO2+4H2O.

[0140] The gas separator is connected to the oxygen storage tank of the PEMFC hydrogen production system, the carbon dioxide storage tank of the methanol synthesis system, and the water storage tank of the PEMFC hydrogen production system. It is used to separate different types of gases according to the difference in boiling points of gas phase products and transport them to their corresponding storage tanks, thereby realizing the recycling of raw materials.

[0141] The power supply center is connected to the power grid, the DMFC power supply device, and the computer control system, and is used to coordinate the power consumption of the DMFC power supply device and feed back the electric energy generated by the DMFC power supply device to the power grid.

[0142] The DMFC power supply system starts working only after the computer control system issues a peak load instruction.

[0143] In summary, the present invention mainly includes two major sections: methanol synthesis and computer peak regulation.

[0144] The methanol synthesis segment mainly includes the PEMFC hydrogen production system and the methanol synthesis system. The PEMFC hydrogen production system produces hydrogen by electrolyzing desalinated seawater through electrochemical reactions, and obtains oxygen as a byproduct. Oxygen can bring certain economic benefits to offshore wind power systems. The methanol synthesis system converts carbon dioxide transported by ships and hydrogen produced by the PEMFC hydrogen production system into methanol through thermochemical reactions. Methanol can be considered as an energy storage medium that generates economic benefits while maintaining the stability of the power grid.

[0145] The computer peak load regulation section mainly includes a computer control system and a DMFC power supply system. The computer control system is used to control the working status of the PEMFC hydrogen production system, the DMFC power supply system, and the methanol synthesis system. The computer control system contains a storage medium for storing the system's operating program, so that the offshore synthesis platform can continue to operate without human operation. When the computer control system determines that the power supply of the offshore wind farm is insufficient to meet the peak load, it orders the DMFC power supply system to start working. The DMFC power supply system uses methanol produced by the methanol synthesis system and oxygen produced by the PEMFC hydrogen production system as raw materials to generate electricity through the methanol combustion reaction. The generated electricity is finally regulated by the computer control system through the automatic power generation frequency modulation device and supplied to the power grid, so that the power generation of the offshore wind farm can meet the power demand of the power user. The existence of the DMFC power supply system helps to reduce the impact of offshore wind farms on the power grid and maintain the stability of the power output of offshore wind farms.

[0146] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An offshore wind power peak load regulation system based on methanol synthesis to meet peak load, including an offshore wind farm, a power grid, and a transport ship; It is characterized in that It also includes an offshore synthesis platform, which includes an automatic power generation and frequency modulation device, a PEMFC hydrogen production system, a DMFC power supply system, a methanol synthesis system and a computer control system. The computer control system is used to connect to the automatic power generation and frequency modulation device, the PEMFC hydrogen production system, the DMFC power supply system and the methanol synthesis system and control them respectively. The automatic power generation and frequency modulation device is used to dispatch the output direction of the current. The methanol synthesis system and the PEMFC hydrogen production system are used to control the conversion between electric energy and methanol. The DMFC power supply system is used to transmit the electric energy generated by the combustion of methanol to the power grid through the automatic power generation and frequency modulation device. The offshore synthesis platform is respectively connected to the offshore wind farm and the power grid, and directly transmits with the transport ship.

2. The offshore wind power peak load regulation system based on methanol synthesis to meet peak load according to claim 1, characterized in that: The automatic power generation and frequency modulation device comprises a frequency sensor, a controller, an execution component, a communication module and a power supply, and the electric energy consumed by the automatic power generation and frequency modulation device is directly provided by the power grid; The frequency sensor is used to collect frequency data of electric energy generated by the wind farm in real time and transmit the frequency data to the controller; The controller is used to receive frequency data from the frequency sensor, perform logic calculations according to a preset frequency range and adjustment strategy, and issue corresponding instructions to the wind farm to adjust the output power of the wind farm; The execution component is used to actually control the output power of the wind farm generator set, and to change the load or output power of the wind farm generator set by executing the control signal; The communication module is used to exchange data and communicate with the wind farm generator set and other system components to ensure information transmission and coordination between various components; The power supply is used to provide power support for an offshore wind power peak regulation system.

3. The offshore wind power peak load regulation system based on methanol synthesis to meet peak load according to claim 1, characterized in that: The PEMFC hydrogen production system includes a water pump, a seawater desalination device, a water storage tank, a PEMFC hydrogen production reactor, a hydrogen purification device, an oxygen purification device, a hydrogen compression device, an oxygen compression device, a hydrogen storage tank and an oxygen storage tank; The water pump is directly connected to the seawater desalination device and is used to extract seawater from the sea and transport the seawater to the seawater desalination device; The seawater desalination device is directly connected to the water pump and the water storage tank to complete the desalination of the extracted seawater; The water storage tank is directly connected to the seawater desalination device and the PEMFC hydrogen production reactor, and is used to store the obtained desalinated seawater; The PEMFC hydrogen production reactor is connected to a hydrogen purification device and an oxygen purification device, and is used to electrolyze water in a water storage tank to produce hydrogen and oxygen; The PEMFC hydrogen production reactor adopts proton exchange membrane electrolysis, and the electrolyte of the PEMFC hydrogen production reactor adopts acidic electrolyte; The anode material and cathode material of the PEMFC hydrogen production reactor are platinum and platinum alloy; The electrochemical reaction occurring at the anode of the PEMFC hydrogen production reactor is: H2-2e - =2H + ; The electrochemical reaction at the cathode is: O2+4H + +4e - =2H2O; the overall electrochemical reaction is: 2H2+O2=2H2O; The hydrogen purification device is connected to the PEMFC hydrogen production reactor and the hydrogen compression device, and is used to purify the hydrogen produced by the reaction and transport the purified hydrogen to the hydrogen compression device; The oxygen purification device is connected to the PEMFC hydrogen production reactor and the oxygen compression device, and is used to purify the oxygen produced by the reaction and transport the purified oxygen to the oxygen compression device; The hydrogen compression device is connected to the hydrogen purification device and the hydrogen storage tank, and is used to compress the purified hydrogen and transport the compressed hydrogen to the hydrogen storage tank; The oxygen compression device is connected to the oxygen purification device and the oxygen storage tank, and is used for compressing the purified oxygen and transporting the compressed oxygen to the oxygen storage tank.

4. The offshore wind power peak load regulation system based on methanol synthesis to meet peak load according to claim 1, characterized in that: The methanol synthesis system comprises a carbon dioxide vaporizer, a carbon dioxide storage tank, a carbon dioxide compressor, a hydrogen compressor, a methanol synthesis device, an auxiliary heating device, a methanol separator, a gas separation device, a methanol flash tank, a methanol distillation tower and a methanol storage tank; The carbon dioxide vaporizer is connected to the carbon dioxide storage tank and is used to convert the liquid carbon dioxide transported by the transport ship into gaseous carbon dioxide; The carbon dioxide storage tank is connected to the carbon dioxide vaporizer and is used to store the carbon dioxide obtained by gasification; The hydrogen compressor is connected to the hydrogen storage tank and the methanol synthesis device and is used to compress the hydrogen used for the reaction; The carbon dioxide compressor is connected to the carbon dioxide storage tank and the methanol synthesis device, and is used to compress the carbon dioxide involved in the reaction; The methanol synthesis device is connected to a carbon dioxide compressor, a hydrogen compressor and a methanol separator to complete the preparation of methanol; The chemical reaction formula occurring in the methanol synthesis device is: CO2+3H2=CH3OH+H2O, and the methanol synthesis device uses a copper-based catalyst; The auxiliary heating device is connected to the methanol synthesis system and is used to convert electrical energy into thermal energy to provide an ambient temperature of 200-300 degrees Celsius for the methanol synthesis device; The methanol separator is directly connected to the methanol synthesis device and is used to separate the liquid phase product and the gas phase product produced by the reaction; The gas separation device is connected to the methanol separator, the water storage tank of the PEMFC hydrogen production system, the hydrogen compressor of the PEMFC hydrogen production system, and the carbon dioxide storage tank of the methanol synthesis system, and is used to separate different types of gases according to the differences in boiling points of gas phase products and transport them to their corresponding storage tanks; The methanol flash tank is connected to the methanol separator and the methanol distillation tower, and is used to evaporate the crude methanol in the liquid phase product according to the difference in boiling points of different products; The methanol distillation tower is connected to the methanol flash tank and the methanol storage tank, and is used to purify the crude methanol obtained from the methanol flash tank to obtain refined methanol with higher purity; The methanol storage tank is connected to the methanol distillation tower and is used to store the produced refined methanol.

5. The offshore wind power peak load regulation system based on methanol synthesis to meet peak load according to claim 1, characterized in that: The computer control system includes a command response module, a judgment module, a first control module and a second control module; The command response module is used to issue commands for determining peak loads and issuing peak load and frequency regulation commands; The judgment module is used to complete the judgment process of whether there is a peak load and whether additional power supply is needed; The first control module is used to issue a peak load instruction and determine whether it is a peak load moment, and to order the execution of the second control module when the determination is established; The second control module is used to issue peak-shaving instructions and determine whether it is a peak load moment. When it is determined that "offshore wind turbine power generation > grid demand", the PEMFC hydrogen production system and the methanol synthesis system are started; when it is determined that "offshore wind turbine power generation < grid demand", the power to be adjusted is first determined, and the DMFC power supply system is started. After the frequency is adjusted together with the power generated by the offshore wind farm and the power generated by the DMFC power supply system, power is supplemented to the grid to meet the peak load demand of the grid.

6. The offshore wind power peak load regulation system based on methanol synthesis to meet peak load according to claim 5, characterized in that: It also includes a signal detector, a storage medium, a memory, an instruction executor, and a power supply component; The signal detector is directly connected to the power grid, and is used to display the current load of the power grid, and to determine whether the current offshore wind turbine power generation is at peak load through a specific algorithm. The signal detector can also determine the required peak load regulation power and issue frequency regulation instructions based on the power supply situation of the power grid; The memory is used to store application programs involved in the operation of the first control module and the second control module; The command executor is used to execute the above-mentioned judgment and command execution process; The storage medium is used to store computer instructions so that the peak load regulation process can continue when there is no one operating; The power supply component is directly connected to the signal detector, storage medium, memory, and instruction executor, and is used to provide the electrical energy consumed by the above-mentioned devices when they are working.

7. The offshore wind power peak load regulation system based on methanol synthesis to meet peak load according to claim 5, characterized in that: It also includes a peak load regulation and frequency modulation operation to meet the peak load, and the peak load regulation and frequency modulation operation to meet the peak load includes: Executing the first control module, responding to the instruction to determine the peak load, if it is determined that the current time is not the peak load, then ordering all the electricity generated by the offshore wind farm to be used for methanol production; if it is determined that the current time is the peak load, then ordering the execution of the second control module; The second control module is executed to confirm the power to be adjusted during the peak load regulation process. If the power generation of the offshore wind farm meets the peak load demand at this time, the electric energy generated by the offshore wind farm will be supplied to the power grid after frequency regulation by the automatic power generation and frequency regulation device, and the remaining electric energy after meeting the peak load will be used for methanol preparation; if the power generation of the offshore wind farm is not enough to meet the peak load demand at this time, the second control module is first commanded to determine the power to be adjusted, and the DMFC power supply system is ordered to start working, and electric energy is generated by the DMFC power supply system, and the electric energy generated by the DMFC power supply system and the offshore wind farm is adjusted to the input frequency of the power grid through the automatic power generation and frequency regulation device, so as to supplement electric energy to the power grid to meet the peak load demand.

8. The offshore wind power peak load regulation system based on methanol synthesis to meet peak load according to claim 1, characterized in that: The DMFC power supply system comprises a DMFC power supply device, a gas separation device and a power supply center; The DMFC power supply device is connected to the PEMFC hydrogen production system and the methanol synthesis system to realize the electrochemical reaction of methanol and oxygen; The DMFC power supply device adopts a proton exchange membrane; the electrolyte of the DMFC power supply device adopts an acidic electrolyte; the anode electrode material and the cathode electrode material of the DMFC power supply device are both carbon black; the DMFC power supply device adopts platinum as its anode catalyst; the DMFC power supply device adopts a carbon-platinum alloy as its cathode catalyst; The electrochemical reaction occurring at the anode of the DMFC power supply device is: CH3OH+H2O-6e - =CO2+6H + ; The electrochemical reaction at the cathode is: O2+4H + +4e - =2H2O; the total electrochemical reaction of the DMFC power supply device is: 2CH3OH+3O2=2CO2+4H2O; The gas separator is connected to the PEMFC hydrogen production system and the methanol synthesis system, and is used to separate different types of gases according to the difference in boiling points of gas phase products and transport them to their corresponding storage tanks; The power supply center is connected to the power grid, the DMFC power supply device, and the computer control system, and is used to coordinate the power consumption of the DMFC power supply device and feed back the electric energy generated by the DMFC power supply device to the power grid; The DMFC power supply system starts working only after the computer control system issues a peak load regulation instruction.

9. The offshore wind power peak load regulation system based on methanol synthesis to meet peak load according to claim 1, characterized in that: The automatic power generation and frequency modulation device, the PEMFC hydrogen production system, the methanol synthesis system and the computer control system are directly connected to the power grid.

10. The offshore wind power peak load regulation system based on methanol synthesis to meet peak load according to claim 1, characterized in that: The transport vessel may be used to transport carbon dioxide, oxygen by-product, and methanol product.

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