Green methanol synthesis control system and method conforming to ISCC authentication

Abstract

The invention relates to a green methanol synthesis control system and method conforming to ISCC authentication, and belongs to the technical field of new energy. The substance system realizes methanol synthesis through a biomass raw material pretreatment unit, a gasification device, a conversion device, a purification device and a methanol synthesis device; the electric energy system integrates a renewable energy power generation unit, a power grid and a hydrogen energy storage power station, renewable energy power preferentially and directly supplies power to the water electrolysis hydrogen production device, surplus power is connected to the internet, and the power grid supplies power to the water electrolysis hydrogen production device according to a PPA protocol when the power is insufficient; the hydrogen energy storage power station receives electrolytic hydrogen to generate power, the generated power is preferentially supplied to station service power, and the surplus power is connected to the internet; the feedback signal system is used for controlling the hydrogen flow adjusting device to reduce the amount of supplemented hydrogen input into the methanol synthesis device and synchronously increasing the amount of hydrogen input into the hydrogen energy storage power station when the supply amount of the biomass raw material is reduced. The system is mainly used for large-scale production of green methanol conforming to ISCC certification, and cooperative control over efficient consumption of renewable energy and stable operation of factories is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy. More particularly, the present application relates to a green methanol synthesis control system and method in line with ISCC certification. BACKGROUND

[0002] Under the background of jointly addressing climate change and accelerating the transformation of energy structure worldwide, green methanol, as a liquid fuel, has the characteristics of high energy density and easy storage and transportation at normal temperature and pressure, which can effectively solve the volatility of intermittent renewable energy such as wind and solar energy, long-period storage and cross-regional transportation problems, promote efficient consumption of renewable energy and flexible adjustment of energy systems, and improve energy security and resilience. In addition, the European Union imposes a special carbon dioxide emissions tariff on imported high-energy products under the CBAM (Carbon Border Adjustment Mechanism); the increasingly stringent ship emission regulations of the International Maritime Organization (IMO) are driving the shipping industry to seek clean alternative fuels. Green methanol, as a highly potential clean energy carrier, is increasingly highlighting its strategic significance in the field of energy conservation and transportation, and has become one of the most promising options for commercialization.

[0003] Prior art, such as the system for synthesizing green hydrogen from biomass fluidized bed gasification coupled with green hydrogen to produce green methanol disclosed in Chinese Patent Publication (Announcement) No. CN119875694A, although it solves the problem of synthesis of green hydrogen and green carbon, it does not involve the supply scheme of green electricity for plant use. According to the mandatory requirements of the ISCC certification system for the green electricity attribute of the whole process, this technology cannot meet the complete certification standards of green methanol due to the lack of green electricity guarantee link for plant use. SUMMARY

[0004] The purpose of the present application is to solve the problems of the existing green methanol production, such as the inability to guarantee the green electricity attribute of plant use, the contradiction between renewable energy fluctuations and production stability, and the lack of coordination between material and energy systems. A green methanol synthesis control system and method in line with ISCC certification are provided, which realizes dynamic coordination control of green electricity and materials through the integration of material systems, electrical energy systems and feedback signal systems, ensures stable operation of the system and the green electricity attribute of plant use, and meets the requirements of ISCC certification.

[0005] I. In order to solve the above problems and achieve the purpose and other advantages of the present application, a green methanol synthesis control system in line with ISCC certification is provided, comprising: (1) a material system, comprising: a biomass raw material pretreatment unit; an oxygen preparation device; a water electrolysis hydrogen preparation device; A biomass gasification device receives biomass feedstock processed by a biomass feedstock pretreatment unit, and oxygen produced by an electrolytic water hydrogen production device and purified, and supplemental oxygen produced by an oxygen production device; A shift device receives the crude synthesis gas delivered by the biomass gasification device and adjusts the carbon-hydrogen ratio; A purification device receives the gas delivered by the shift device and performs desulfurization and decarburization to produce clean synthesis gas; A methanol synthesis device receives the clean synthesis gas delivered by the purification device, and supplemental hydrogen distributed by a hydrogen flow regulating device from the electrolytic water hydrogen production device; (2) An electric energy system, comprising: A power grid; A renewable energy power generation unit, which outputs power in two ways, one of which is directly connected to the electrolytic water hydrogen production device, and the other is connected to the power grid; when the renewable energy power generation unit has excess power, the excess power is input into the power grid; when the renewable energy power generation unit has insufficient power, the electrolytic water hydrogen production device is powered by the power grid; A hydrogen energy storage power station, which receives hydrogen gas distributed by the hydrogen flow regulating device from the electrolytic water hydrogen production device and generates electricity, and the output power of the hydrogen energy storage power station is divided into two ways, one of which is used as auxiliary power, and the other is connected to the power grid; when the hydrogen energy storage power station generates more power than the auxiliary power demand, the excess power is input into the power grid; the total amount of power supplied to the electrolytic water hydrogen production device by the power grid is ≤ the amount of power input into the power grid by the renewable energy power generation unit + the amount of power input into the power grid by the hydrogen energy storage power station; (3) A feedback signal system connected to the biomass feedstock supply end and the hydrogen flow regulating device, used to: When the amount of biomass feedstock supplied decreases, a biomass feedstock decrease signal is transmitted to the hydrogen flow regulating device, which reduces the amount of supplemental hydrogen input into the methanol synthesis device and increases the amount of hydrogen input into the hydrogen energy storage power station.

[0006] Preferably, in the green methanol synthesis control system certified by ISCC, the feedback signal system is also used to: When the total amount of hydrogen supplied by the electrolytic water hydrogen production device decreases, a signal is sent to the biomass feedstock supply end through the hydrogen flow regulating device via the feedback signal system to reduce the amount of biomass feedstock input; When the total amount of hydrogen supplied by the electrolytic water hydrogen production device increases, a signal is sent to the biomass feedstock supply end through the hydrogen flow regulating device via the feedback signal system to increase the amount of biomass feedstock input, but not exceeding the rated input amount, and the excess hydrogen flows to the hydrogen energy storage power station.

[0007] Preferably, in the ISCC-certified green methanol synthesis control system, the output end of the renewable energy power generation unit is connected to a renewable energy power supply interruption monitoring module, the renewable energy power supply interruption monitoring module is built-in a priority arbitration unit, the renewable energy power supply interruption monitoring module includes a current sensor and a frequency detector; wherein: The current sensor monitors the output current value of the renewable energy power generation unit in real time; The frequency detector monitors the AC frequency value of the renewable energy power generation unit and the grid connection point in real time; When the following conditions are met at the same time, the renewable energy power supply interruption monitoring module generates a renewable energy power supply interruption response instruction: The output current value is less than 10% of the rated current value for 5 minutes; The AC frequency value drops by more than the rated frequency for 10 seconds; The renewable energy power supply interruption response instruction includes: Send a load reduction instruction to the biomass raw material pretreatment unit; The biomass raw material pretreatment unit responds to the load reduction instruction and reduces the number of running crushers or dryers in the biomass raw material pretreatment unit by a preset proportion; Send a switch grid power supply instruction to the water electrolysis hydrogen production device; The priority arbitration unit of the renewable energy power supply interruption monitoring module is configured to: When biomass reduction and renewable energy power supply interruption are detected at the same time, the renewable energy power supply interruption response instruction is executed preferentially.

[0008] Preferably, in the ISCC-certified green methanol synthesis control system, a hydrogen storage buffer tank is provided on the hydrogen input pipeline of the hydrogen energy storage power station, and a pressure sensor is installed inside the tank body of the hydrogen storage buffer tank; When the real-time pressure inside the tank reaches a safety threshold or the pressure change rate is greater than or equal to 0.5 MPa / s, the water electrolysis hydrogen production device performs a power reduction operation: By reducing the electrolyzer rectifier output current and simultaneously reducing the electrolyzer water pump flow, the hydrogen production per unit time is reduced.

[0009] Preferably, in the ISCC-certified green methanol synthesis control system, a trend analysis module is provided between the feedback signal system and the hydrogen flow regulating device; The trend analysis module is configured to perform: Collect the biomass raw material supply amount every minute, and calculate the supply amount change rate ΔS for 3 consecutive minutes; When the absolute value of ΔS is greater than a preset threshold K, a step adjustment instruction is generated; The hydrogen flow regulating device adjusts the supplementary hydrogen input into the methanol synthesis device in steps according to the step formula in response to the step adjustment instruction: If ΔS is negative, the supplementary hydrogen input into the methanol synthesis device is reduced according to the step formula; If ΔS is positive, the supplementary hydrogen input into the methanol synthesis device is increased according to the step formula; The step formula is: step = |ΔS| / K × basic adjustment amount; wherein the basic adjustment amount is a preset constant, and the adjustment interval is a fixed period T; The hydrogen flow regulating device adjusts the supplementary hydrogen input into the methanol synthesis device in steps according to the step formula until the following conditions are met simultaneously: The deviation of the current supplementary hydrogen input into the methanol synthesis device from the target hydrogen amount is ≤5%; The hydrogen amount change value in the last three adjustment periods is <2% of the basic adjustment amount.

[0010] Preferably, in the green methanol synthesis control system meeting the ISCC certification, a grid access point is provided with a grid-connected and off-grid switch; a dryer of a biomass raw material pretreatment unit is connected to an emergency power interface; and the grid-connected and off-grid switch is configured to perform: Real-time monitoring of the voltage and frequency of the grid-connected point; When the grid-connected point voltage continuously falls below the lower threshold of the rated voltage or exceeds the upper threshold of the rated voltage for 10s, and / or the frequency continuously deviates from the rated frequency threshold for 10s, it is determined that the grid is faulty; When it is determined that the grid is faulty for 10min, automatically switch to off-grid mode; In off-grid mode: a) maintain the basic energy supply path: All power of the renewable energy power generation unit is directly supplied to the water electrolysis hydrogen production device; The hydrogen produced by the water electrolysis hydrogen production device is distributed to the hydrogen energy storage power station by the hydrogen flow regulating device; The power generated by the hydrogen energy storage power station is directly supplied to the plant power system; b) handle renewable energy alone surplus: When the renewable energy power generation capacity is greater than the demand of the water electrolysis hydrogen production device and the plant power demand is fully met: The water electrolysis hydrogen production device increases the rectifier output current and the water pump flow to the maximum capacity; The extra hydrogen is stored in the hydrogen storage buffer tank; Maintain normal operation of the hydrogen energy storage power station; c) handle hydrogen energy alone surplus: When the renewable energy power generation capacity meets the demand of the water electrolysis hydrogen production device, and the hydrogen energy storage power station generates more power than the plant power demand: The surplus power is transmitted to the dryer through the emergency power interface; The dryer raises the drying temperature to the design threshold or extends the drying operation time; Reduce the amount of hydrogen input into the hydrogen storage power station, and store the excess hydrogen in the hydrogen storage buffer tank; d) Processing double surplus: When the renewable energy power generation is greater than the demand of the water electrolysis hydrogen production device, and the hydrogen storage power station power generation is greater than the demand of the auxiliary power system: Stop inputting hydrogen into the hydrogen storage power station completely, and store all hydrogen in the hydrogen storage buffer tank; Disconnect the power supply of the hydrogen storage power station to the auxiliary power system; Direct all power of the renewable energy power generation unit to the auxiliary power system; The surplus renewable energy power is transmitted to the dryer through the emergency power interface; The dryer raises the drying temperature to the material limit value or starts all standby drying units; The hydrogen storage power station switches to standby state.

[0011] II. The control method of the green methanol synthesis control system meeting the ISCC certification, comprising the following steps: (1) Material system operation: The biomass raw material is input into the biomass gasification device after being treated by the pretreatment unit; The oxygen generated by the water electrolysis hydrogen production device and the supplementary oxygen generated by the oxygen preparation device are jointly input into the biomass gasification device; The crude synthesis gas generated by gasification is adjusted by the shift device to adjust the carbon-hydrogen ratio, and then enters the purification device for desulfurization and decarburization to form pure synthesis gas; The pure synthesis gas and the supplementary hydrogen distributed by the hydrogen flow regulating device of the water electrolysis hydrogen production device are input into the methanol synthesis device to synthesize methanol; (2) Electric energy coordination and ISCC compliance control: The power of the renewable energy power generation unit is directly supplied to the water electrolysis hydrogen production device; When the renewable energy power generation unit supplies excess power, the excess power is input into the power grid; When the renewable energy power generation unit is insufficient, the power grid supplies power to the water electrolysis hydrogen production device; The power generated by the hydrogen storage power station is directly supplied to the auxiliary power of the entire system; When the hydrogen storage power station generates more power than the demand of the auxiliary power, the excess power is input into the power grid; Within one month, the total amount of power supplied by the power grid to the water electrolysis hydrogen production device is less than or equal to the amount of power input into the power grid by the renewable energy power generation unit plus the amount of power input into the power grid by the hydrogen storage power station; (3) Feedback signal regulation: When the supply amount of biomass raw material decreases, the feedback signal system transmits a signal to the hydrogen flow regulating device; The hydrogen flow regulating device responds to the signal to reduce the amount of supplementary hydrogen input into the methanol synthesis device and increase the amount of hydrogen input into the hydrogen storage power station.

[0012] Thirdly, the present application at least includes the following beneficial effects: According to the RED II authorization system, the present application increases the grid access system, inputs the excess power of water electrolysis hydrogen production into the grid when the renewable energy generation is surplus, and supplies power to the water electrolysis hydrogen production device from the grid when the renewable energy generation is insufficient, thereby ensuring the stable operation of the water electrolysis hydrogen production device and meeting the green hydrogen certification requirements. For the green electricity property certification problem of the synthetic methanol plant auxiliary power, the present application increases the hydrogen storage power station, uses the generated power to directly supply the auxiliary power, thereby not only solving the key requirement that the green methanol auxiliary power must be green electricity through ISCC certification, but also effectively balancing the contradiction between the intermittency of renewable energy generation and the stability of auxiliary power demand. In addition, the present application introduces a hydrogen flow regulating device, which receives feedback signals and dynamically adjusts the hydrogen distribution when the reduction of biomass raw material supply leads to the reduction of auxiliary power load, thereby reducing the amount of supplementary hydrogen input into the methanol synthesis device and increasing the amount of hydrogen input into the hydrogen storage power station, so that the excess power generated by the hydrogen storage power station is connected to the grid, thereby realizing the collaborative control and dynamic balance between the internal material flow, energy flow and external power system of the green methanol synthesis plant, and becoming a key technical point for the efficient and stable operation of the entire system.

[0013] The present application realizes the dynamic collaboration of material and energy system through a bidirectional feedback mechanism, automatically triggers the reduction of biomass raw material supply when the hydrogen supply of the water electrolysis hydrogen production device is reduced, and vice versa, thereby synchronously maintaining the stability of the carbon-hydrogen ratio and effectively solving the problem of material and energy disconnection caused by green electricity fluctuation.

[0014] The present application constructs a priority arbitration mechanism to ensure production continuity, forcibly switches the power supply of the water electrolysis hydrogen production device to the grid and reduces the biomass pretreatment load when detecting abnormal renewable energy power supply, and preferentially executes power supply protection measures when encountering raw material shortage and power supply interruption at the same time, thereby avoiding hydrogen production interruption risk.

[0015] The present application establishes real-time linkage control of hydrogen storage safety and hydrogen production load, automatically triggers the water electrolysis hydrogen production device to perform collaborative load reduction operation by monitoring the pressure change of the hydrogen storage buffer tank, and simultaneously reduces the rectifier current and water pump flow when the pressure is abnormal, thereby eliminating the risk of hydrogen storage overload and maintaining the electrolysis efficiency.

[0016] The present application uses a stepwise regulation strategy to cope with raw material fluctuation, generates stepwise regulation instructions by real-time analysis of biomass supply change trend, and gradually adjusts the hydrogen distribution amount by the hydrogen flow regulating device according to the calculated step length, thereby significantly reducing the hydrogen flow rate mutation and improving the stability of auxiliary power.

[0017] The application develops a multi-stage energy consumption mechanism in an off-grid mode, automatically switches the operation mode when the power grid fails and executes a four-stage energy scheduling strategy, maintains production through the basic energy supply path, consumes surplus power by using the drying machine, and ensures the continuous operation of the system under extreme working conditions.

[0018] Other advantages, objects, and features of the application will be apparent from the following specification, and will be understood by those skilled in the art. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a green methanol synthesis control system processing flowchart according to an embodiment of the application; Wherein, the reference signs are as follows: 100 - material system; 101 - biomass raw material pretreatment unit; 102 - biomass gasification device; 103 - shift device; 104 - purification device; 105 - methanol synthesis device; 106 - water electrolysis hydrogen production device; 107 - oxygen preparation device; 200 - electric energy system; 201 - wind power generation device; 202 - photovoltaic power generation device; 203 - power grid; 204 - hydrogen energy storage power station; 300 - feedback signal system; 301 - hydrogen flow regulating device; Figure 1 , represents material transmission; represents electric energy transmission; represents signal transmission. DETAILED DESCRIPTION

[0020] The application will be further described in detail below with reference to the accompanying drawings, so that those skilled in the art can implement it according to the description.

[0021] As shown in Figure 1 , the application provides a green methanol synthesis control system conforming to ISCC certification, comprising: a material system 100, which comprises: a biomass raw material pretreatment unit 101; an oxygen preparation device 107 (air separation device); a water electrolysis hydrogen production device 106; Biomass gasification device 102 receives biomass raw material processed by biomass raw material pretreatment unit, and oxygen produced by electrolytic water hydrogen production device and purified (including catalytic dehydrogenation and molecular sieve adsorption process) and supplemental oxygen produced by oxygen production device; the oxygen required by the biomass gasification device is sourced from purified oxygen (processed by catalytic dehydrogenation and molecular sieve adsorption) by-produced by electrolytic water hydrogen production device and supplemental oxygen specially produced by oxygen production device; the root cause is that the amount of by-produced oxygen by electrolytic water hydrogen production process is relatively limited and cannot meet the total oxygen demand for the stable operation of the biomass gasification device, so additional supplemental oxygen must be provided by the oxygen production device to ensure sufficient oxygen source for the gasification process.

[0022] Shift device 103 receives the raw synthesis gas delivered by the biomass gasification device and adjusts the carbon-hydrogen ratio; Purification device 104 receives the gas delivered by the shift device and performs desulfurization and decarburization processing to produce clean synthesis gas; Methanol synthesis device 105 receives clean synthesis gas delivered by the purification device and supplemental hydrogen gas distributed by the hydrogen flow regulating device of the electrolytic water hydrogen production device; Electric energy system 200 includes: Power grid 203; Renewable energy power generation unit includes wind power device 201 and photovoltaic power device 202, and the output power of the renewable energy power generation unit is divided into two paths, one of which is directly connected to the electrolytic water hydrogen production device, and the other is connected to the power grid; when the renewable energy power generation unit has excess power, the excess power is input into the power grid; when the renewable energy power generation unit has insufficient power, the power grid supplies power to the electrolytic water hydrogen production device through the PPA agreement; the output power of the renewable energy power generation unit is divided into two paths: one is directly connected to the electrolysis tank rectifier cabinet of the electrolytic water hydrogen production device to supply power for the core electrolysis reaction; the other is connected to the power grid. It should be particularly pointed out that the other power-consuming components (such as circulating pumps, purification system compressors, cooling water units, control units, and auxiliary equipment) in the electrolytic water hydrogen production device except the electrolysis tank are powered by the auxiliary power system. The auxiliary power is directly provided by the hydrogen energy storage power station to ensure that the operating power of the auxiliary equipment of the hydrogen production device also meets the green electricity attribute requirements.

[0023] Hydrogen energy storage power station 204 receives hydrogen gas distributed by the hydrogen flow regulating device of the electrolytic water hydrogen production device and generates electricity, and the output power of the hydrogen energy storage power station is divided into two paths, one of which is used as auxiliary power, and the other is connected to the power grid; when the hydrogen energy storage power station generates more power than the demand for auxiliary power, the excess power is input into the power grid; the total amount of power supplied by the power grid to the electrolytic water hydrogen production device ≤ (the amount of power input into the power grid by the renewable energy power generation unit + the amount of power input into the power grid by the hydrogen energy storage power station); Feedback signal system 300 connects the biomass raw material supply end and the hydrogen flow regulating device 301, which is used to: When the supply of biomass raw materials decreases, a biomass raw material reduction signal is transmitted to the hydrogen flow regulating device, and the hydrogen flow regulating device reduces the amount of supplemental hydrogen input into the methanol synthesis device and increases the amount of hydrogen input into the hydrogen energy storage power station. The consumption of biomass for large-scale production of green methanol is huge, and in actual production, the situation of insufficient raw material supply needs to be considered. When the supply of biomass raw materials is insufficient, a feedback signal system is transmitted to the hydrogen flow regulating device to reduce the amount of supplemental hydrogen input into the methanol synthesis device and increase the amount of hydrogen input into the hydrogen energy storage power station. Because the load of the methanol synthesis system is reduced, the auxiliary power consumption is necessarily reduced, and the excess power of the hydrogen energy storage power station is connected to the power grid to balance the excess system power. In this way, it not only ensures that the synthesized methanol meets the ISCC certification and becomes internationally recognized truly green methanol, but also achieves biomass gasification and green electricity coupling and collaborative control, solving the problem of the contradiction between renewable energy consumption instability and the need for synthesized methanol to meet ISCC certification.

[0024] The present application provides a green methanol synthesis control system that meets ISCC certification, aiming to solve the problems of missing green electricity attributes in auxiliary power, contradictions between renewable energy fluctuations and production stability, and lack of coordination between material and energy systems in the prior art. The control system includes a material system 100, an electrical energy system 200, and a feedback signal system 300, and the specific composition and operation mechanism are as follows: I. Material system 100 Comprising the following units connected in sequence: 1. Biomass raw material pretreatment unit 101 - crushing and screening treatment of biomass raw materials; 2. Biomass gasification device 102 - receiving pretreated biomass raw materials, while inputting purified oxygen generated by electrolytic water hydrogen production device 106 and supplemental oxygen generated by oxygen preparation device 107, to generate crude synthesis gas; 3. Shift device 103 - adjusting the carbon-hydrogen ratio (H2 / CO) of the crude synthesis gas; 4. Purification device 104 - desulfurization and decarburization treatment of the gas to produce clean synthesis gas; 5. Methanol synthesis device 105 - receiving clean synthesis gas and supplemental hydrogen distributed by hydrogen flow regulating device 301 from electrolytic water hydrogen production device 106 to synthesize methanol.

[0025] II. Electrical energy system 200 Comprising the following core components: 1. Renewable energy power generation unit (including wind power generation device 201 and photovoltaic power generation device 202): The output power is divided into two paths: One path is directly connected to the electrolytic cell rectifier cabinet of electrolytic water hydrogen production device 106; The other path is connected to power grid 203; When there is excess power supply, the excess power is input into the power grid 203; when there is insufficient power supply, the power grid 203 supplies power to the water electrolysis hydrogen production device 106 through the PPA protocol.

[0026] 2. Power grid 203 - provides supplementary power supply through the PPA protocol.

[0027] 3. Hydrogen storage power station 204: Receives hydrogen gas distributed by the water electrolysis hydrogen production device 106 through the hydrogen flow regulating device 301 to generate electricity; The output power is divided into two parts: One part is used as plant power to directly supply all system equipment; The other part is connected to the power grid 203; When the generated power exceeds the demand for plant power, the excess power is input into the power grid 203. Key compliance design: the total amount of power supplied by the power grid 203 to the water electrolysis hydrogen production device 106 per month ≤ (the amount of power input into the power grid 203 by the renewable energy power generation unit + the amount of power input into the power grid 203 by the hydrogen storage power station 204), which meets the monthly matching requirement of green electricity for ISCC certification.

[0028] Three, feedback signal system 300 Composed of the following units in linkage: 1. Biomass raw material supply end sensor - real-time monitoring of raw material supply; 2. Hydrogen flow regulating device 301 - receives sensor signals and distributes hydrogen; the control logic is as follows: When the supply of biomass raw materials decreases: the biomass raw material bin weight sensor transmits a signal to the hydrogen flow regulating device 301, which responds by reducing the amount of supplemental hydrogen input into the methanol synthesis device 105, while simultaneously increasing the amount of hydrogen input into the hydrogen storage power station 204, which in turn increases the amount of power generated by the hydrogen storage power station 204, and the excess power is input into the power grid 203.

[0029] Three-system cooperative operation principle: 1. Coupling of matter and energy: 1) The water electrolysis hydrogen production device 106 simultaneously supplies oxygen and hydrogen to the material system 100 and delivers hydrogen to the electric energy system 200 for hydrogen storage power generation; 2) The power generated by the hydrogen storage power station 204 is directly supplied to the plant power equipment, covering the power demand of the entire methanol synthesis process.

[0030] 2. Dynamic balance mechanism: 1) When the supply of biomass raw materials decreases, the hydrogen is redistributed to the hydrogen storage power station 204 to avoid energy waste and maintain stable plant power; 2) When the green electricity fluctuates, the power grid 203 supplements the power supply according to the PPA protocol to ensure the continuity of water electrolysis hydrogen production.

[0031] 3. Authentication compliance closed loop: 1) PPA agreement matches green electricity monthly, ensuring the green hydrogen property of water electrolysis hydrogen production; 2) Hydrogen energy storage power station 204 directly supplies factory power, meeting the mandatory requirement of ISCC for green electricity property of the whole chain.

[0032] Final technical effect: 1. ISCC authentication compliance of the whole chain: 1) Through PPA agreement, match green electricity monthly (power grid 203 power supply ≤ renewable energy on-grid amount + hydrogen energy on-grid amount), ensure that water electrolysis hydrogen production meets the green hydrogen certification standard; 2) Hydrogen energy storage power station 204 directly supplies factory power, solves the problem of missing green electricity property of methanol synthesis plant, and meets the mandatory requirement of ISCC for green electricity of the whole process.

[0033] 2. Fundamental solution of core contradiction: 1) Power grid 203 access and PPA agreement coordination, resolve the influence of renewable energy fluctuation on the stability of water electrolysis; 2) Hydrogen energy storage power station 204 as an energy buffer hub, balances the contradiction between intermittent green electricity and continuous factory power supply; 3) Feedback signal system 300 realizes dynamic redistribution of hydrogen under fluctuation of raw materials, maintains material and energy balance of the system.

[0034] 3. Resource efficiency and stability improvement: 1) Renewable energy surplus power on-grid consumption, power grid 203 counter-supply when insufficient, optimize overall energy dispatching efficiency; 2) When the biomass raw material fluctuates, the system responds quickly through hydrogen redistribution, ensuring continuous operation of methanol synthesis; 3) The design of electric energy system 200 avoids the risk of shutdown caused by green electricity fluctuation, and the stability of plant operation is significantly enhanced.

[0035] 4. Breakthrough of system synergy: 1) Material system 100, electric energy system 200 and feedback signal system 300 are deeply integrated, breaking the limitation of isolated operation of each subsystem in the prior art; 2) Hydrogen energy storage power station 204 is connected in series with power supply and material production, forming a closed loop link of "green electricity hydrogen production-hydrogen distribution-factory power supply coverage".

[0036] In summary, through the collaborative design of material system 100, electric energy system 200 and feedback signal system 300, the green methanol synthesis system meeting ISCC authentication is constructed, and the three technical bottlenecks of missing green electricity authentication of factory power supply, energy fluctuation transmission and isolated operation of the system are overcome, which is suitable for large-scale green methanol production in renewable energy rich areas.

[0037] In another aspect, the green methanol synthesis control system in accordance with ISCC certification, the feedback signal system is also used for: When the total amount of hydrogen supplied by the water electrolysis hydrogen production device decreases, the hydrogen flow regulating device sends a signal to the biomass raw material supply end through the feedback signal system, and the biomass raw material input is reduced; when the total amount of hydrogen supplied by the water electrolysis hydrogen production device decreases due to insufficient renewable energy (for more than a month), the hydrogen flow regulating device transmits a feedback signal to the biomass material supply end to reduce the supply of biomass material and reduce the load of methanol production.

[0038] When the total amount of hydrogen supplied by the water electrolysis hydrogen production device increases, the hydrogen flow regulating device sends a signal to the biomass raw material supply end through the feedback signal system, and the biomass raw material input is increased, but not more than the rated total input, and the excess hydrogen flows to the hydrogen energy storage power station.

[0039] When the total amount of hydrogen supplied by the water electrolysis hydrogen production device decreases (such as a decrease of 10% for 5 minutes), the hydrogen flow regulating device sends an instruction to the biomass raw material supply end through the feedback signal system. The biomass raw material pretreatment unit responds to the instruction and reduces the number of running crushers or dryers by a preset proportion, for example, 30% of the crushing equipment is disabled, so that the biomass raw material input is reduced to 70% of the original supply. Conversely, when the total amount of hydrogen supply increases (such as an increase of 15% for 5 minutes), the feedback signal triggers the biomass raw material supply end to increase the input, for example, the speed of the screw feeder is increased to 120% of the rated value. The adjustment instruction is transmitted through a 4-20mA current signal, and the response delay from signal emission to device action is controlled within 5 minutes, ensuring that the biomass raw material adjustment is synchronized with the change in hydrogen supply.

[0040] Effect: The two-way feedback mechanism maintains the stability of the carbon-hydrogen ratio in the system. When the hydrogen supply abnormally decreases, the synchronous reduction of the biomass raw material input avoids the imbalance of the carbon-hydrogen ratio in the shift device; when the hydrogen supply increases, the raw material supply is increased to ensure the sufficiency of the raw material for the methanol synthesis device. The overall scheme realizes the dynamic cooperation of the material subsystem and the energy subsystem, and solves the problem of disconnection between material and energy caused by green power fluctuations in the prior art.

[0041] In another aspect, the green methanol synthesis control system in accordance with ISCC certification, the output end of the renewable energy power generation unit is connected to a renewable energy power supply interruption monitoring module, the renewable energy power supply interruption monitoring module is provided with a priority arbitration unit, and the renewable energy power supply interruption monitoring module includes a current sensor and a frequency detector; wherein: The current sensor monitors the output current value of the renewable energy power generation unit in real time; The frequency detector monitors the AC frequency value of the connection point of the renewable energy power generation unit and the power grid in real time; The renewable energy supply interruption monitoring module generates a renewable energy supply interruption response instruction when the following conditions are met simultaneously: The output current value is less than 10% of the rated current value for 5 minutes; The AC frequency value drops away from the rated frequency for 10 seconds; The renewable energy supply interruption response instruction includes: sending a load reduction instruction to the biomass raw material pretreatment unit; The biomass raw material pretreatment unit responds to the load reduction instruction by reducing the number of operating crushers or dryers in the biomass raw material pretreatment unit by a preset proportion; sending a switch grid power supply instruction to the water electrolysis hydrogen production device; The priority arbitration unit of the renewable energy supply interruption monitoring module is configured to: When biomass raw material reduction and renewable energy supply interruption are detected simultaneously, the renewable energy supply interruption response instruction is executed preferentially.

[0042] A power supply interruption monitoring module is configured at the output end of the renewable energy power generation unit, which includes a current sensor and a frequency detector. The current sensor continuously monitors the output current value, and the frequency detector continuously monitors the AC frequency value of the grid connection point. When the output current value is less than 10% of the rated value for 5 minutes and the AC frequency value deviates from the rated frequency for 10 seconds, the power supply interruption monitoring module generates an interruption response instruction. The instruction performs two operations: sending a load reduction instruction to the biomass raw material pretreatment unit to reduce the number of operating crushing equipment by a preset proportion; sending a switch grid power supply instruction to the water electrolysis hydrogen production device to force the switch to grid power supply mode. The module has a priority arbitration unit that, when biomass raw material reduction signal and power supply interruption signal are detected simultaneously, preferentially executes the power supply interruption response instruction and suspends the raw material adjustment operation.

[0043] If the biomass raw material supply reduction triggers hydrogen flow adjustment (increases hydrogen storage energy input) and a renewable energy supply interruption occurs suddenly, the system faces double risks: on the one hand, the water electrolysis hydrogen production device needs to switch to grid power supply, but due to the PPA agreement green electricity quota, it may be interrupted due to insufficient monthly green electricity balance; on the other hand, the hydrogen storage power station cannot stably supply plant power due to insufficient hydrogen input, and the methanol synthesis device is forced to reduce load due to power fluctuations. The existing technology does not cover this collaborative failure scenario. This scheme uses a priority arbitration mechanism to forcibly suspend the raw material adjustment operation, preferentially guaranteeing the switch of grid power supply, and ensuring the continuous operation of the water electrolysis hydrogen production. At the same time, the pretreatment unit load reduction operation in the interruption response instruction reduces the consumption of raw materials, alleviating the hydrogen supply gap caused by hydrogen production interruption.

[0044] Effect: This mechanism effectively avoids the risk of chain collapse. In the event of a power supply interruption, the delay of the electrolytic water hydrogen production device switching to grid power supply is controlled within 10s, and the pre-processing unit reduces the load operation within 5min. Priority arbitration ensures that grid switching takes priority over raw material regulation, avoiding hydrogen production interruption caused by PPA quota depletion. The hydrogen storage power station maintains basic power supply during hydrogen production recovery, ensuring the continuity of methanol synthesis device operation and meeting the ISCC certification requirements for production stability.

[0045] In another scheme, in the green methanol synthesis control system meeting the ISCC certification, a hydrogen storage buffer tank is arranged on the hydrogen input pipeline of the hydrogen storage power station, and a pressure sensor is arranged in the tank body of the hydrogen storage buffer tank; when the pressure sensor detects that the real-time pressure in the tank body reaches a safety threshold or the pressure change rate is ≥0.5MPa / s, the electrolytic water hydrogen production device performs power reduction operation: By reducing the output current of the electrolytic cell rectifier and synchronously reducing the flow of the electrolytic cell water pump, the hydrogen production per unit time is reduced.

[0046] A hydrogen storage buffer tank is arranged on the hydrogen input pipeline of the hydrogen storage power station, and a pressure sensor is arranged in the tank body. The pressure sensor monitors the pressure and pressure change rate in the tank in real time. When it is detected that the real-time pressure reaches a safety threshold (set to 85% of the rated working pressure of the hydrogen storage buffer tank) or the pressure change rate is ≥0.5MPa / s, the electrolytic water hydrogen production device triggers power reduction operation: the output current of the electrolytic cell rectifier is reduced at a rate of 0.5% per second, and the flow of the electrolytic cell water pump is simultaneously reduced to 80% of the original flow, so that the hydrogen production per unit time is reduced. The power reduction operation continues until the pressure drops below the safety threshold or the pressure change rate is <0.1MPa / s.

[0047] If the supply of biomass raw materials decreases, causing the amount of hydrogen input into the hydrogen storage power station to increase suddenly, and the pressure of the hydrogen storage buffer tank approaches the upper limit, through real-time pressure monitoring and hydrogen production power reduction operation, the hydrogen production is actively reduced when the pressure abnormally rises, avoiding overloading of the hydrogen storage capacity. The coordinated adjustment of the rectifier current and the water pump flow in the power reduction operation ensures that the electrolysis efficiency is maintained within a reasonable range, preventing equipment damage caused by sudden drops.

[0048] Effect: This mechanism effectively eliminates the risk of hydrogen storage safety, and the response delay of the event where the pressure exceeds the threshold is controlled within 2s. Dynamic adjustment of hydrogen production load avoids forced discharge of hydrogen, ensuring that all hydrogen is used in a closed loop within the PPA agreement framework, meeting the energy efficiency requirements of ISCC certification. The system maintains stable hydrogen storage pressure during fluctuations in biomass raw materials, and the hydrogen storage power station continues to provide green electricity for plant power, ensuring continuous operation of the methanol synthesis.

[0049] In another solution, the green methanol synthesis control system meeting the ISCC certification criterion is provided with a trend analysis module between the feedback signal system and the hydrogen flow adjusting device. The trend analysis module is configured to perform: The biomass raw material supply amount is collected every minute, and the supply amount change rate ΔS of 3 consecutive minutes is calculated. When the absolute value of ΔS is greater than a preset threshold K, a step adjustment instruction is generated. The hydrogen flow adjusting device responds to the step adjustment instruction and adjusts the supplemental hydrogen amount input into the methanol synthesis device in steps according to a step length formula: If ΔS is negative, the supplemental hydrogen amount input into the methanol synthesis device is reduced according to the step length formula. If ΔS is positive, the supplemental hydrogen amount input into the methanol synthesis device is increased according to the step length formula. The step length formula is: step length = |ΔS| / K x basic adjustment amount; wherein the basic adjustment amount is a preset constant, and the adjustment interval is a fixed period T. The hydrogen flow adjusting device adjusts the supplemental hydrogen amount input into the methanol synthesis device in steps according to the step length formula until the following conditions are met simultaneously: The deviation of the current supplemental hydrogen amount input into the methanol synthesis device from the target hydrogen amount is ≤5%. The hydrogen amount change value of 3 consecutive adjustment periods is <2% of the basic adjustment amount.

[0050] A trend analysis module is additionally provided between the feedback signal system and the hydrogen flow adjusting device. The module collects biomass raw material supply amount data every minute and calculates the supply amount change rate of 3 consecutive minutes. When the absolute value of the change rate is greater than a preset threshold of 10%, a step adjustment instruction is generated. After the hydrogen flow adjusting device responds to the instruction, the hydrogen amount input into the methanol synthesis device is adjusted in steps according to a step length formula: if the change rate is negative, the hydrogen amount is gradually reduced; if the change rate is positive, the hydrogen amount is gradually increased. The step length is calculated based on the absolute value of the change rate divided by the threshold of 10% and multiplied by a basic adjustment amount of 5 Nm 3 / min, and the adjustment interval is fixed at 30 s. The adjustment process continues until the deviation of the current hydrogen amount from the target value is ≤5% and the change amount of 3 consecutive adjustment periods is less than 2% of the basic adjustment amount.

[0051] If the supply of biomass raw materials fluctuates frequently and lacks a fluctuation filtering mechanism, it is easy to cause three problems: first, the high-frequency operation of the hydrogen flow regulating device causes the hydrogen flow rate to fluctuate, affecting the stability of the hydrogen storage power station; second, the plant power fluctuates; third, the mechanical wear of the regulating valve intensifies. The scheme effectively filters transient fluctuations through the continuous change rate calculation of the trend analysis module and the step adjustment mechanism. The step-by-step regulation avoids flow fluctuations, significantly reduces hydrogen flow fluctuations, improves the stability of plant power, ensures production continuity, and effectively reduces the frequency of regulating valve operation, extending the service life of the equipment. The design of matching the total amount of green electricity per month in the electric energy system (the amount of power supplied by the grid ≤ the amount of power generated by the renewable energy power generation unit input into the grid + the amount of power input into the grid by the hydrogen storage power station) meets the ISCC certification requirements.

[0052] Effect: This mechanism effectively eliminates the risk of system oscillation. During fluctuations in biomass raw materials, the hydrogen distribution process is smooth and continuous, and the stability of plant power output is significantly improved. The overall scheme can still maintain continuous operation of methanol synthesis in unstable raw material supply areas.

[0053] In another scheme, the green methanol synthesis control system that meets ISCC certification has a grid access point with an on-grid and off-grid switch, and the dryer of the biomass raw material pretreatment unit is connected to an emergency power interface. The on-grid and off-grid switch is configured to perform: Real-time monitoring of the voltage and frequency of the grid access point; When the grid voltage is continuously below the lower threshold of the rated voltage or above the upper threshold of the rated voltage for 10 seconds, and / or the frequency continuously deviates from the rated frequency threshold for 10 seconds, it is determined that the grid is faulty; When it is determined that the grid is faulty for 10 minutes, automatically switch to off-grid mode; In off-grid mode: a) Maintain the basic energy supply path: All power from the renewable energy power generation unit is directly supplied to the water electrolysis hydrogen production device; The hydrogen produced by the water electrolysis hydrogen production device is distributed to the hydrogen storage power station through the hydrogen flow regulating device; The power generated by the hydrogen storage power station is directly supplied to the plant power system; b) Handle the excess of renewable energy alone: When the renewable energy power generation capacity is greater than the demand of the water electrolysis hydrogen production device and the plant power demand is fully met: The water electrolysis hydrogen production device increases the output current of the rectifier and the flow of the water pump to the maximum capacity; The excess hydrogen is stored in the hydrogen storage buffer tank; Maintain normal operation of the hydrogen storage power station; c) Handle the excess of hydrogen storage alone: When renewable energy power generation meets the demand of water electrolysis hydrogen production device, and hydrogen energy storage power station power generation is greater than the demand of auxiliary power system, the following operations are performed: The surplus power is transmitted to the dryer through the emergency power interface; The dryer increases the drying temperature to the design threshold or prolongs the drying operation time; The amount of hydrogen input into the hydrogen energy storage power station is reduced, and the excess hydrogen is stored in the hydrogen storage buffer tank; d) Processing double surplus: When renewable energy power generation is greater than the demand of water electrolysis hydrogen production device, and hydrogen energy storage power generation is greater than the demand of auxiliary power system, the following operations are performed: Stop inputting hydrogen into the hydrogen energy storage power station completely, and store all hydrogen in the hydrogen storage buffer tank; Disconnect the power supply of the hydrogen energy storage power station to the auxiliary power system; All power of the renewable energy power generation unit is directly supplied to the auxiliary power system; The surplus renewable energy power is transmitted to the dryer through the emergency power interface; The dryer increases the drying temperature to the material limit value or starts all standby drying units; The hydrogen energy storage power station switches to standby state.

[0054] A grid-connected off-grid switch is set at the grid access point, and the voltage and frequency values of the grid access point are monitored in real time. When it is detected that the grid voltage is continuously lower than the lower limit of the rated voltage or higher than the upper limit threshold for 10s, and / or the frequency deviates from the rated frequency for 10s, it is determined that the grid fails. If the failure lasts for 10 minutes, it is automatically switched to off-grid mode. Four types of operations are performed in off-grid mode: a) maintain basic power supply: renewable energy power is directly supplied to the water electrolysis hydrogen production device, the hydrogen produced is distributed to the hydrogen energy storage power station through the adjustment device, and the hydrogen energy storage power supplies the auxiliary power system; b) processing renewable energy alone surplus: when the renewable energy power generation exceeds the demand of water electrolysis, and the auxiliary power is satisfied, the electrolytic cell is operated at full load, and the excess hydrogen is stored in the hydrogen storage buffer tank; c) processing hydrogen energy storage alone surplus: when the hydrogen energy storage power generation exceeds the demand of auxiliary power, the excess power is transmitted to the dryer of the pretreatment unit through the emergency interface, and the dryer increases the temperature or prolongs the operation time; d) processing double surplus: stop inputting hydrogen into the hydrogen energy storage power station completely, disconnect its power supply to the auxiliary power, renewable energy power directly supplies the auxiliary power system, and the excess power is transmitted to the dryer through the emergency interface to increase the temperature to the limit value or start the standby drying unit.

[0055] If the grid fails and the grid-connected function fails, and no off-grid mode is designed, two risks are faced: one is that the interruption of plant power forces the methanol synthesis device to shut down; the second is that the surplus renewable energy power cannot be absorbed, causing equipment overload. The present scheme maintains the continuous operation of water electrolysis hydrogen production and key loads (such as oxygen pumps of gasification devices) during grid failure through the multi-path processing mechanism of the off-grid mode; the dryer as a flexible load absorbs surplus power to avoid energy waste; the priority operation of the double surplus scenario prevents system collapse.

[0056] Effect: The off-grid switching mechanism significantly improves system resilience. When the grid fails, the mode switching is completed within 10 minutes and the basic production is maintained; the dryer temperature is raised to the design threshold (such as 120℃) to absorb 20-30% of the surplus power; in extreme scenarios, the staged operation avoids the risk of cascading shutdown. The overall scheme ensures the continuous operation of methanol synthesis in weak grid areas (such as remote wind and light bases), meeting the ISCC certification requirements for production stability.

[0057] The control method of the green methanol synthesis control system in accordance with the ISCC certification includes the following steps: 1) Material system operation: The biomass raw material is processed by the pretreatment unit and input into the biomass gasification device; The oxygen produced by the water electrolysis hydrogen production device and the supplemental oxygen produced by the oxygen preparation device (air separation device) are jointly input into the biomass gasification device; The crude synthesis gas generated by gasification is adjusted by the shift device to adjust the carbon-hydrogen ratio and then enters the purification device to remove sulfur and carbon, forming net synthesis gas; The net synthesis gas and the supplemental hydrogen gas distributed by the hydrogen flow regulating device from the water electrolysis hydrogen production device are input into the methanol synthesis device to synthesize methanol; 2) Electric energy coordination and ISCC compliance control: The power from the renewable energy power generation unit is preferentially supplied directly to the water electrolysis hydrogen production device; When the renewable energy power generation unit has excess power, the excess power is input into the grid; When the renewable energy power generation unit has insufficient power, the grid supplies power to the water electrolysis hydrogen production device; The power generated by the hydrogen energy storage power station is preferentially supplied directly to the plant power of the entire system; When the hydrogen energy storage power station generates more power than the plant power demand, the excess power is input into the grid; Within one month, the total amount of power supplied by the grid to the water electrolysis hydrogen production device is ≤ the amount of power input into the grid by the renewable energy power generation unit + the amount of power input into the grid by the hydrogen energy storage power station; 3) Feedback signal regulation: When the biomass raw material supply decreases, the feedback signal system transmits a signal to the hydrogen flow regulating device; The hydrogen flow regulating device responds to the signal to reduce the amount of hydrogen input into the methanol synthesis device and increase the amount of hydrogen input into the hydrogen energy storage power station.

[0058] The system implements a green methanol synthesis control method in line with ISCC certification. In the material system operation, the biomass raw material is crushed and sieved by the pretreatment unit and then input into the biomass gasification device. The device simultaneously receives oxygen purified by the electrolytic water hydrogen production device for gasification reaction. The generated crude synthesis gas is input into the shift device to adjust the carbon-hydrogen ratio, and then treated by the purification device to form clean synthesis gas. The clean synthesis gas and the supplemental hydrogen distributed by the hydrogen flow regulating device of the electrolytic water hydrogen production device are jointly input into the methanol synthesis device to synthesize methanol. The oxygen output end of the electrolytic water hydrogen production device is connected to the inlet of the gasification device, and the hydrogen output end is divided into two paths: one path is input into the methanol synthesis device through the regulating device, and the other path is input into the hydrogen energy storage power station.

[0059] In the electric energy coordination and ISCC compliance control phase, the wind turbine or photovoltaic component of the renewable energy power generation unit outputs power directly to the electrolytic water hydrogen production device. When the renewable energy power generation capacity exceeds the hydrogen production demand, the excess power is connected to the power grid; when the power generation capacity is insufficient, the power grid supplies power to the electrolytic water hydrogen production device through the PPA agreement, and the total amount of power supplied by the power grid in a single month does not exceed the amount of power input into the power grid by the renewable energy source. The hydrogen energy storage power station receives hydrogen to generate power, and the generated power is directly supplied to the plant power equipment; if the power generation capacity exceeds the plant demand, the excess power is connected to the power grid. The monthly green power matching mechanism ensures the green power property of the electrolytic water hydrogen production, which meets the ISCC certification requirements.

[0060] In the feedback signal regulation phase, when the amount of biomass raw material supply decreases, the feedback signal system transmits a signal to the hydrogen flow regulating device. After the regulating device responds, the amount of hydrogen input into the methanol synthesis device is reduced, and the amount of hydrogen input into the hydrogen energy storage power station is increased simultaneously. The hydrogen redistribution operation is realized by a proportional regulating valve, and the valve opening rate is controlled by a PID algorithm to avoid flow mutation.

[0061] Compared with the prior art which only solves the problem of synthesis gas production, the present scheme makes up for its defects through a triple synergy mechanism: first, the electric energy system design covers the green power demand of plant power, and the hydrogen energy storage power station serves as an intermediate hub for power supply, while the prior art does not provide a solution for plant power; second, the monthly green power matching mechanism (the amount of power supplied by the power grid ≤ the amount of power input into the power grid by the renewable energy power generation unit + the amount of power input into the power grid by the hydrogen energy storage power station) meets the ISCC compliance, and the prior art lacks a green power certification design; third, the feedback signal regulation realizes the linkage between materials and energy, and automatically adjusts the hydrogen distribution when the raw material is in short supply, while the material and electric energy subsystems in the prior art operate independently. The prior art cannot build a full green methanol production system because it ignores the link between plant green power and ISCC compliance.

[0062] Effect: This scheme ensures the stable operation and compliance of the system. The material conversion process is continuous and efficient; the power dispatch balances the green power fluctuation and the plant demand; the feedback regulation responds to the change of raw materials to avoid system imbalance. The overall scheme realizes the large-scale production of green methanol in the renewable energy-rich area.

[0063] While the embodiments of the application have been disclosed in connection with the above specification and drawings, it will be understood that it is not intended to limit the application to the details of the specification and drawings, and this application will cover any adaptations or modifications of the application as they come to be within the scope of the claims and equivalents thereof.

Claims

1. A green methanol synthesis control system in compliance with ISCC certification, characterized by, Comprise: a material system, comprising: a biomass raw material pretreatment unit; an oxygen preparation device; a water electrolysis hydrogen production device; a biomass gasification device receiving biomass raw material processed by the biomass raw material pretreatment unit, and oxygen produced by the water electrolysis hydrogen production device and purified, and supplemental oxygen produced by the oxygen preparation device; a shift device receiving crude synthesis gas delivered by the biomass gasification device and adjusting the carbon-hydrogen ratio; a purification device receiving gas delivered by the shift device and performing desulfurization and decarburization processing to produce clean synthesis gas; a methanol synthesis device receiving clean synthesis gas delivered by the purification device, and supplemental hydrogen distributed by the hydrogen flow regulating device from the water electrolysis hydrogen production device; an electric energy system, comprising: a power grid; a renewable energy power generation unit, the output power of which is divided into two paths, one of which is directly connected to the water electrolysis hydrogen production device, and the other of which is connected to the power grid; when the renewable energy power generation unit has excess power supply, the excess power is input into the power grid; when the renewable energy power generation unit has insufficient power supply, the power grid supplies power to the water electrolysis hydrogen production device; a hydrogen energy storage power station receiving hydrogen distributed by the hydrogen flow regulating device from the water electrolysis hydrogen production device and generating power, the output power of the hydrogen energy storage power station being divided into two paths, one of which is used as auxiliary power, and the other of which is connected to the power grid; when the hydrogen energy storage power station has excess power generation, the excess power is input into the power grid; the total amount of power supplied to the water electrolysis hydrogen production device by the power grid is ≤ the amount of power input into the power grid by the renewable energy power generation unit + the amount of power input into the power grid by the hydrogen energy storage power station; a feedback signal system connected to the biomass raw material supply end and the hydrogen flow regulating device, for: when the amount of biomass raw material supply decreases, transmitting a biomass raw material decrease signal to the hydrogen flow regulating device, the hydrogen flow regulating device decreasing the amount of supplemental hydrogen input into the methanol synthesis device and increasing the amount of hydrogen input into the hydrogen energy storage power station.

2. The ISCC certified green methanol synthesis control system of claim 1, wherein, the feedback signal system is also used for: when the total amount of hydrogen supply from the water electrolysis hydrogen production device decreases, sending a signal to the biomass raw material supply end through the hydrogen flow regulating device via the feedback signal system to decrease the amount of biomass raw material input; when the total amount of hydrogen supply from the water electrolysis hydrogen production device increases, sending a signal to the biomass raw material supply end through the hydrogen flow regulating device via the feedback signal system to increase the amount of biomass raw material input, but not exceeding the rated input amount, and the excess hydrogen is input into the hydrogen energy storage power station.

3. The ISCC certified green methanol synthesis control system of claim 1, wherein, The output end of the renewable energy power generation unit is connected to a renewable energy power supply interruption monitoring module, the renewable energy power supply interruption monitoring module has a built-in priority arbitration unit, the renewable energy power supply interruption monitoring module includes a current sensor and a frequency detector; wherein: the current sensor monitors the output current value of the renewable energy power generation unit in real time; the frequency detector monitors the AC frequency value of the connection point of the renewable energy power generation unit and the power grid in real time; when the following conditions are met at the same time, the renewable energy power supply interruption monitoring module generates a renewable energy power supply interruption response instruction: the output current value is continuously lower than 10% of the rated current value for 5 min; the AC frequency value drops continuously for 10 s and deviates from the rated frequency; the renewable energy power supply interruption response instruction includes: sending a load reduction instruction to the biomass raw material pretreatment unit; The biomass raw material pretreatment unit reduces the number of running crushers or dryers of the biomass raw material pretreatment unit according to a preset proportion in response to a load reduction instruction; A switching power grid power supply instruction is sent to the water electrolysis hydrogen production device; The priority arbitration unit of the renewable energy power supply interruption monitoring module is configured to: When the biomass raw material reduction and the renewable energy power supply interruption are detected at the same time, the renewable energy power supply interruption response instruction is preferentially executed.

4. The ISCC certified green methanol synthesis control system of claim 1, wherein, A hydrogen storage buffer tank is arranged on the hydrogen input pipeline of the hydrogen energy storage power station, and a pressure sensor is arranged in the tank body of the hydrogen storage buffer tank; when the real-time pressure in the tank body reaches a safety threshold or the pressure change rate is greater than or equal to 0.5 MPa / s, the water electrolysis hydrogen production device performs a power reduction operation: By reducing the electrolytic cell rectifier output current and synchronously reducing the electrolytic cell water pump flow, the hydrogen production per unit time is reduced.

5. The ISCC certified green methanol synthesis control system of claim 1, wherein, A trend analysis module is arranged between the feedback signal system and the hydrogen flow regulating device; The trend analysis module is configured to perform: The biomass raw material supply amount is collected every minute, and the supply amount change rate ΔS of 3 consecutive minutes is calculated; When the absolute value of ΔS is greater than a preset threshold K, a step adjustment instruction is generated; The hydrogen flow regulating device adjusts the supplementary hydrogen amount input into the methanol synthesis device according to the step adjustment instruction: If ΔS is negative, the supplementary hydrogen amount input into the methanol synthesis device is reduced according to the step formula; If ΔS is positive, the supplementary hydrogen amount input into the methanol synthesis device is increased according to the step formula; The step formula is: step = |ΔS| / K×basic adjustment amount; wherein the basic adjustment amount is a preset constant, and the adjustment interval is a fixed period T; The hydrogen flow regulating device adjusts the supplementary hydrogen amount input into the methanol synthesis device according to the step formula until the following conditions are simultaneously met: The deviation between the current supplementary hydrogen amount input into the methanol synthesis device and the target hydrogen amount is less than or equal to 5%; The hydrogen amount change value of 3 consecutive adjustment periods is less than 2% of the basic adjustment amount.

6. The ISCC certified green methanol synthesis control system of claim 1, wherein, A grid access point is provided with a grid-connected off-grid switch; the dryer of the biomass raw material pretreatment unit is connected to an emergency power interface; and the grid-connected off-grid switch is configured to perform: Real-time monitoring of the voltage and frequency of the grid connection point; When the grid connection point voltage continuously falls below the lower threshold of the rated voltage or continuously rises above the upper threshold of the rated voltage for 10s, and / or the frequency continuously deviates from the rated frequency threshold for 10s, it is determined that the grid is faulty; When it is determined that the grid fault lasts for 10 minutes, the off-grid mode is automatically switched to; In the off-grid mode: a) maintain the basic energy supply path: All power of the renewable energy power generation unit is directly supplied to the water electrolysis hydrogen production device; The hydrogen produced by the water electrolysis hydrogen production device is distributed to the hydrogen energy storage power station through the hydrogen flow regulating device; The power generated by the hydrogen energy storage power station is directly supplied to the plant power system; b) handle renewable energy alone surplus: When the renewable energy power generation capacity is greater than the demand of the water electrolysis hydrogen production device and the plant power demand is fully met: The water electrolysis hydrogen production device increases the rectifier output current and the water pump flow to the maximum capacity; The excess hydrogen is stored in the hydrogen storage buffer tank; Maintain the normal operation of the hydrogen energy storage power station; c) handle hydrogen energy alone surplus: When the renewable energy power generation meets the demand of water electrolysis hydrogen production device, and the hydrogen energy storage power station generates more power than the demand of auxiliary power system, the surplus power is transmitted to the dryer through the emergency power interface. The dryer increases the drying temperature to the design threshold or prolongs the drying operation time. The amount of hydrogen input into the hydrogen energy storage power station is reduced, and the excess hydrogen is stored in the hydrogen storage buffer tank. d) Processing double surplus: When the renewable energy power generation is greater than the demand of water electrolysis hydrogen production device, and the hydrogen energy storage power generation is greater than the demand of auxiliary power system, the hydrogen input into the hydrogen energy storage power station is completely stopped, and all the hydrogen is stored in the hydrogen storage buffer tank. The hydrogen energy storage power station is disconnected from the auxiliary power system. All the power of the renewable energy power generation unit is directly supplied to the auxiliary power system. The surplus renewable energy power is transmitted to the dryer through the emergency power interface. The dryer increases the drying temperature to the material limit value or starts all the standby drying units. The hydrogen energy storage power station switches to standby state. The following steps are included: 1) Material system operation:

7. A control method for a green methanol synthesis control system in compliance with ISCC certification as claimed in claim 1, characterized by, The biomass raw material is processed by the pretreatment unit and then input into the biomass gasification device. The oxygen generated by the water electrolysis hydrogen production device and the supplemental oxygen generated by the oxygen preparation device are jointly input into the biomass gasification device. The crude synthesis gas generated by gasification is adjusted by the shift device to adjust the carbon-hydrogen ratio, and then enters the purification device to remove sulfur and carbon, forming net synthesis gas. The net synthesis gas and the supplemental hydrogen distributed by the hydrogen flow regulating device of the water electrolysis hydrogen production device are input into the methanol synthesis device to synthesize methanol. 2) Electric energy coordination and ISCC compliance control: The power of the renewable energy power generation unit is directly supplied to the water electrolysis hydrogen production device. When the renewable energy power generation unit supplies excess power, the excess power is input into the power grid. When the renewable energy power generation unit supplies insufficient power, the power grid supplies power to the water electrolysis hydrogen production device. The power generated by the hydrogen energy storage power station is directly supplied to the auxiliary power system of the entire system. When the hydrogen energy storage power station generates more power than the demand of auxiliary power system, the excess power is input into the power grid. Within one month, the total amount of power supplied by the power grid to the water electrolysis hydrogen production device is less than or equal to the amount of power input into the power grid by the renewable energy power generation unit plus the amount of power input into the power grid by the hydrogen energy storage power station. 3) Feedback signal regulation: When the supply of biomass raw material decreases, the feedback signal system transmits a signal to the hydrogen flow regulating device. The hydrogen flow regulating device responds to the signal by reducing the amount of supplemental hydrogen input into the methanol synthesis device and increasing the amount of hydrogen input into the hydrogen energy storage power station. ​ ​

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