Starting operation method of cluster type alkaline electrolytic cell system

Abstract

The invention discloses a starting operation method of a cluster type alkaline electrolytic cell system, which comprises the following steps: a hot alkali starting process is adopted in a starting stage, and the hot alkali starting process comprises the following steps: preheating alkali liquor to a set temperature; and in the operation stage, hydrogen and oxygen generated by electrolysis are independently treated by adopting a tower type container. The blank in the field of starting operation of the cluster type alkaline water electrolysis hydrogen production system adapting to ultra-wide load fluctuation is filled up, the starting process of a traditional alkaline water electrolysis hydrogen production system is optimized, the original cold alkali starting process is changed into the hot alkali starting process, and in the operation control stage, hydrogen-oxygen separator liquid level control is abandoned, so that the operation efficiency is improved. Hydrogen and oxygen are respectively treated by adopting the tower type container, so that the safe operation stability of the system is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of photovoltaic hydrogen production, and in particular relates to a method for starting and operating a clustered alkaline electrolyzer system. Background Art

[0002] Hydrogen energy is a secondary energy source with abundant sources, green and low carbon, and wide applications. It can help to absorb renewable energy on a large scale, realize large-scale peak load regulation of power grids, and cross-seasonal and cross-regional energy storage, and accelerate the low-carbonization of industries, construction, transportation, etc. Hydrogen production by water electrolysis coupled with renewable energy is currently the greenest and most environmentally friendly hydrogen production technology route. Currently, there are alkaline electrolyzers, proton exchange membrane electrolyzers, solid oxide electrolyzers, anion exchange membrane electrolyzers and other water electrolysis hydrogen production technology forms. Among them, alkaline electrolyzers have the highest technical maturity and the largest scale of commercial applications.

[0003] At present, a 300MW photovoltaic hydrogen production project uses 52 1000Nm 3 / h alkaline electrolyzer is used to dynamically convert the electricity of photovoltaic power station into hydrogen energy. However, during the demonstration operation, it was found that the existing alkaline electrolyzer hydrogen production system could not adapt well to the large-scale renewable energy hydrogen production demand. When the photovoltaic load fluctuated violently, the existing alkaline electrolyzer system could not continuously and stably absorb photovoltaic power and had to rely on the grid power. This is mainly because the existing alkaline electrolysis system hydrogen and oxygen separation system has limited volume capacity and its operation is heavily dependent on the hydrogen and oxygen separator liquid level difference control. See Figure 1 When the load fluctuates, the hydrogen and oxygen separation system is unable to respond in time, causing the hydrogen and oxygen concentration to exceed the standard, causing the system to shut down and even cause safety problems. Summary of the invention

[0004] The purpose of the present invention is to overcome the problem that the startup and operation of the existing clustered alkaline water electrolysis hydrogen production system cannot adapt to ultra-wide load fluctuations, and proposes a startup and operation method for a clustered alkaline electrolyzer system.

[0005] In order to achieve the above object, the present invention adopts the following technical scheme: A method for starting and operating a clustered alkaline electrolyzer system comprises the following steps: The hot alkali startup process is adopted in the startup stage, and the hot alkali startup process includes preheating the alkali solution to the set temperature; During the operation phase, tower containers are used to independently process the hydrogen and oxygen produced by electrolysis.

[0006] Furthermore, in the hot alkali startup process, the alkali solution is heated to a temperature of 60°C-90°C, and the alkali solution is evenly distributed in the electrolytic cell through a circulation pump.

[0007] Furthermore, the tower-type container includes a hydrogen treatment tower and an oxygen treatment tower, and independently controls the hydrogen-oxygen products through a gas-liquid separation device and a pressure regulating device respectively.

[0008] Furthermore, a multi-stage separation structure is provided in the hydrogen treatment tower and the oxygen treatment tower to reduce the concentration of lye entrained in the gas.

[0009] Furthermore, the hot lye startup process further includes automatic adjustment of the lye concentration to monitor and adjust the lye concentration to 20%-30% in real time.

[0010] Furthermore, during the operation stage, the system dynamically adjusts the current density and voltage of the electrolytic cell, and the current density and voltage of the electrolytic cell follow the load fluctuations of photovoltaic power generation.

[0011] A cluster-type alkaline electrolytic cell system uses the startup and operation method of the cluster-type alkaline electrolytic cell described above, adopts a cluster control architecture, includes a main controller and multiple sub-controllers, and each sub-controller manages the startup, stop and operation parameters of a single electrolytic cell respectively.

[0012] Furthermore, the main controller dynamically distributes the loads of each electrolytic cell based on the photovoltaic power prediction data to maximize the power consumption efficiency.

[0013] Furthermore, a safety monitoring module is equipped during both the startup stage and the operation stage to detect the hydrogen-oxygen concentration, temperature and pressure in real time, and trigger an emergency shutdown protection mechanism in case of anomalies.

[0014] Furthermore, the system startup time is less than 10 minutes.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention provides a startup and operation method for a cluster-type alkaline electrolytic cell system. In the startup stage, the present invention adds a step of heating the lye. In the operation link, the liquid level control link of the hydrogen-oxygen separator is abandoned, which improves the startup speed and the stability of the system's safe operation. The present invention fills the gap in the field of startup and operation of cluster-type alkaline electrolytic water hydrogen production systems that adapt to ultra-wide load fluctuations, optimizes the startup process of traditional alkaline electrolytic water hydrogen production systems, changes the original cold lye startup process to a hot lye startup process. In the operation control stage, the liquid level control of the hydrogen-oxygen separator is abandoned, and the hydrogen and oxygen are separately processed using tower-type containers, which improves the stability of the system's safe operation.

[0016] The present invention provides a cluster-type alkaline electrolytic cell system, which can shorten the startup time of the alkaline electrolytic water hydrogen production system from the original 1 to 2 hours to within 10 minutes, greatly improving the startup efficiency, and abandoning the liquid level control strategy of the hydrogen-oxygen separator, which improves the stability of the system's safe operation. Description of the Drawings

[0017] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the disclosure of the present invention in any way. Additionally, the shapes, proportional dimensions, etc. of the components in the drawings are only schematic and are used to assist in understanding the present invention, rather than specifically defining the shapes and proportional dimensions of the components of the present invention. In the drawings: Figure 1 It is a schematic diagram of the start-up and operation strategy of a traditional alkaline electrolysis system.

[0018] Figure 2 It is a simplified flowchart of the start-up and operation method of a cluster-type alkaline electrolyzer system. Detailed implementation manners

[0019] In order to enable those skilled in the art of the present technology to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0022] It should be noted that the terms "first", "second", etc. in the description, claims and the above-mentioned drawings of the present invention are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0023] Embodiment 1 See Figure 2 , a start-up operation method for a cluster-type alkaline electrolyzer system, comprising the following steps: In the start-up stage, a hot alkali start-up process is adopted. The hot alkali start-up process includes pre-heating the alkali solution to a set temperature; in the hot alkali start-up process, the heating temperature of the alkali solution is 60°C - 90°C, and the alkali solution is evenly distributed in the electrolyzer through a circulation pump. The hot alkali start-up process also includes automatic adjustment of the alkali solution concentration, which is used to monitor and adjust the alkali solution concentration to 20% - 30% in real time.

[0024] In the operation stage, a tower container is used to independently process the hydrogen and oxygen generated by electrolysis. The tower container includes a hydrogen treatment tower and an oxygen treatment tower, and independently controls the hydrogen and oxygen products through a gas-liquid separation device and a pressure regulating device respectively. A multi-stage separation structure is arranged in the hydrogen treatment tower and the oxygen treatment tower to reduce the concentration of alkali solution entrained in the gas. During the operation stage of the system, the current density and voltage of the electrolyzer are dynamically adjusted, and the current density and voltage of the electrolyzer follow the load fluctuations of photovoltaic power generation.

[0025] In this embodiment, by preheating the alkaline solution, the time for the electrolytic cell to reach the operating temperature is significantly shortened. Combined with a circulation pump, the alkaline solution is evenly distributed to ensure a rapid start of the electrolysis reaction. The overall start-up time of the system is < 10 minutes. The alkaline solution concentration is monitored and adjusted in real time to avoid too low concentration (low reaction efficiency) or too high concentration (corrosion risk), extend the equipment life, and ensure the gas production quality and system stability. The direct injection of hot alkaline solution reduces the energy consumption during the heating-up stage, saving about 30%-40% of energy compared with cold start-up, and avoiding electrode damage caused by uneven local temperature. Hydrogen and oxygen are separated from gas to liquid and pressure-regulated through their respective treatment towers to avoid the risk of mixed gas explosion and improve system safety. The entrained alkaline solution in the gas is effectively reduced (the concentration is reduced to the ppm level), the corrosion risk of downstream equipment is reduced, and the gas purity is increased (hydrogen purity ≥ 99.5%). The operating parameters are adjusted according to the fluctuation of the photovoltaic power generation to maximize the consumption of intermittent renewable energy and avoid light curtailment or equipment overload caused by traditional fixed-parameter operation. The independent treatment towers reduce the contact opportunity between hydrogen and oxygen, reducing the electrode oxidation rate; dynamic adjustment avoids long-term overloading operation and extends the life of the electrolytic cell (expected to be increased by 20%-30%). The hot-alkaline start-up reduces energy consumption, and the dynamic operation improves the photovoltaic consumption rate. The overall hydrogen production cost (LCOH) can be reduced by about 15%-20%. The modular design supports the expansion of the electrolytic cell cluster and adapts to different-scale photovoltaic power stations; the fast start-up ability enables it to participate in the grid peak shaving and increase the ancillary service revenue. The efficient coupling of photovoltaic and electrolytic cell realizes the zero-carbon production from green electricity to green hydrogen, providing a low-cost solution for industrial decarbonization and transportation hydrogenation. By quickly starting with hot alkaline solution, the problems of slow start-up and high energy consumption of traditional alkaline electrolytic cells are solved. Through the independent treatment of hydrogen and oxygen and dynamic operation optimization, the safety, gas purity and equipment life are improved. Finally, the dual goals of efficient consumption of renewable energy and economic production of green hydrogen are achieved, which is a key technological innovation to promote the large-scale application of hydrogen energy.

[0026] Embodiment 2 A cluster-type alkaline electrolytic cell system uses a start-up and operation method for a cluster-type alkaline electrolytic cell in Embodiment 1, adopts a cluster control architecture, includes a main controller and multiple sub-controllers, and each sub-controller manages the start-stop and operation parameters of a single electrolytic cell respectively. The main controller dynamically distributes the load of each electrolytic cell based on the photovoltaic power generation prediction data to maximize the power consumption efficiency. A safety monitoring module is equipped in both the start-up stage and the operation stage to detect the hydrogen and oxygen concentrations, temperature and pressure in real time, and trigger an emergency shutdown protection mechanism in case of abnormalities. The system start-up time is less than 10 minutes.

[0027] In this embodiment, the main controller adjusts the load of each electrolyzer in real time based on photovoltaic power prediction, enabling the hydrogen production equipment to highly match the photovoltaic output curve, and avoiding the problems of light curtailment or equipment idleness caused by power generation fluctuations in traditional systems. The system startup time is <10 minutes, and it can quickly respond to the instantaneous fluctuations of photovoltaic power generation (such as rapid recovery after cloud occlusion), maximizing the utilization of intermittent renewable energy. Sensors are equipped throughout the process from startup to operation to continuously monitor key parameters such as hydrogen-oxygen concentration, temperature, and pressure, effectively preventing risks such as leakage, overheating, and overpressure. In case of anomalies, it automatically triggers shutdown to avoid accidents such as fires and explosions, ensuring the safety of personnel and equipment and reducing operation and maintenance risks. The main controller dynamically allocates tasks to avoid long-term overloading or underloading of individual electrolyzers, extending the overall life of the equipment. The sub-controller independently manages a single electrolyzer. In case of a fault, it can quickly locate and isolate the problem unit, reducing the shutdown scope and maintenance costs. It supports the flexible addition and subtraction of electrolyzer modules, facilitating system expansion or adaptation to different-scale photovoltaic power stations. The sub-controller autonomously manages local parameters, and the main controller focuses on global optimization. The system architecture is clear, facilitating subsequent upgrades or integration with other energy sources (such as wind energy). By maximizing the consumption of photovoltaic power, it reduces the demand for grid power purchase and the cost of hydrogen production. Its fast startup ability enables it to respond to grid peak shaving demands and participate in power market transactions, increasing revenue channels. It efficiently consumes photovoltaic power and quickly produces hydrogen, providing a stable and low-cost green hydrogen supply for industries, transportation, and other fields. Combining the photovoltaic and electrolyzer systems realizes the full-chain zero-carbon production from green electricity to green hydrogen. Through the three core advantages of dynamic control, safety monitoring, and fast response, it solves the problems of low efficiency, poor safety, and insufficient flexibility of traditional electrolyzers, and is especially suitable for coupling with highly volatile renewable energy, providing technical feasibility and economic competitiveness for large-scale green hydrogen production.

[0028] Embodiment III With the rapid development of renewable energy, the grid connection requirements of volatile power sources such as photovoltaic power generation have put forward higher requirements for the electrolytic water hydrogen production system. Traditional alkaline electrolyzer systems have the following problems when dealing with drastic fluctuations in photovoltaic load: low startup efficiency, as the traditional cold-alkali startup process requires 1-2 hours to preheat the alkali solution, which is too time-consuming. Strong dependence on liquid level control, the hydrogen-oxygen separator controls gas separation through the liquid level difference. When the load changes suddenly, the response is lagging, resulting in the hydrogen-oxygen concentration exceeding the standard and triggering system shutdown. Insufficient stability, the frequent start and stop of the electrolyzer caused by photovoltaic power fluctuations affect the equipment life and hydrogen production efficiency.

[0029] In response to the above problems, this embodiment proposes a startup and operation method for a cluster-type alkaline electrolyzer system, based on hot-alkali startup and tower container treatment. By optimizing the startup process and operation control mechanism, it realizes fast startup and safe and stable operation under ultra-wide load.

[0030] This system consists of the following modules: The electrolyzer cluster consists of multiple alkaline electrolyzers connected in parallel. The production capacity of a single electrolyzer is 1000 Nm³ / h, and modular expansion is supported.

[0031] The hot alkali circulation system includes an alkali solution storage tank, a heater, a circulation pump, and pipelines, and is used for heating and circulating the alkali solution during the startup phase.

[0032] The tower-type gas treatment unit includes a hydrogen treatment tower and an oxygen treatment tower. The hydrogen treatment tower is equipped with a multi-stage gas-liquid separation structure and a pressure regulating valve inside to achieve efficient purification and regulated output of hydrogen. The structure of the oxygen treatment tower is similar to that of the hydrogen tower, and the oxygen treatment process is independently controlled.

[0033] The cluster control architecture includes a main controller, sub-controllers, and a safety monitoring module. The main controller receives photovoltaic power prediction data and dynamically allocates the electrolyzer load. Each electrolyzer is equipped with an independent sub-controller to adjust the current density, voltage, and alkali solution parameters in real time. The safety monitoring module integrates hydrogen and oxygen concentration sensors, temperature sensors, and pressure sensors, and triggers an emergency shutdown in case of anomalies.

[0034] It includes a hot alkali startup process, and the goal during the startup phase is to shorten the system startup time to within 10 minutes.

[0035] The steps and principles during the startup phase are as follows: Alkali solution preheating: Before startup, the KOH solution (initial concentration 25%) in the alkali solution storage tank is heated to 80°C ± 5°C by an electric heater. This temperature range can significantly reduce the activation energy of the electrolysis reaction. During the heating process, the circulation pump pumps the hot alkali solution into the electrolyzer at a flow rate of 200 L / min to ensure uniform temperature distribution inside the cell.

[0036] Automatic concentration adjustment: The concentration of the alkali solution is monitored in real time through a conductivity sensor. If the concentration is lower than 20%, high-concentration alkali solution is automatically replenished; if it is higher than 30%, deionized water is injected for dilution to maintain the concentration within the optimized range of 25% ± 5%.

[0037] Synchronization of electrolyzer preheating: The electrodes of the electrolyzer are preheated to above 60°C synchronously during the circulation of the hot alkali solution to reduce the thermal stress during startup.

[0038] The hot alkali solution in the present invention directly reduces the ohmic polarization effect, enabling the electrolysis reaction to quickly enter a steady state. The forced convection of the circulation pump avoids local overheating and improves the startup safety.

[0039] The operation phase includes tower-type container treatment and dynamic regulation. The goal during the operation phase is to abandon liquid level control and adapt to photovoltaic load fluctuations (±50% of the rated power).

[0040] The steps and principles during the operation phase are as follows: Gas-liquid Separation and Pressure Regulation: The hydrogen and oxygen generated by electrolysis enter the hydrogen treatment tower and oxygen treatment tower respectively. A three-stage separation structure is set inside the tower: The first stage is a cyclone separator: to remove the entrained liquid caustic soda in the gas (efficiency > 95%). The second stage is a wire mesh demister: to further trap micron-sized droplets. The third stage is a pressure stabilizing valve: according to the pressure feedback of the hydrogen storage tank at the rear end, dynamically adjust the outlet pressure to 1.5 MPa ± 0.1 MPa.

[0041] Dynamic Load Distribution: The main controller distributes the total load to each electrolyzer in proportion based on the photovoltaic power generation prediction curve (such as sunny, cloudy, and night modes).

[0042] For example, when the photovoltaic power drops suddenly by 30%, the main controller switches some electrolyzers to the standby mode, and the current density of the remaining cells drops from 0.4 A / cm² to 0.28 A / cm² to maintain the low-pressure operation of the system.

[0043] The coordinated control of current density and voltage includes the sub-controller adjusting the working point of the electrolyzer according to the real-time load: When the load is high, raise the voltage to 2.1 V and increase the current density to 0.5 A / cm² to maximize the hydrogen production efficiency.

[0044] When the load is low, lower the voltage to 1.8 V and reduce the current density to 0.2 A / cm² to reduce the oxygen evolution side reaction.

[0045] The tower container of the present invention replaces the traditional liquid level control through mechanical separation, and the response speed is increased to the millisecond level. The dynamic adjustment strategy enables the system to operate stably within the range of 20% - 120% of the rated load.

[0046] Cluster Control and Safety Monitoring include a hierarchical control architecture, and the hierarchical control architecture includes a main controller, a sub-controller, and a safety protection mechanism; The main controller executes a global optimization algorithm and updates the load distribution plan every 5 minutes.

[0047] The sub-controller real-time collects parameters such as the temperature, pressure, and current of the electrolyzer, and fine-tunes the operating state with a period of 100 ms.

[0048] The safety protection mechanism includes immediately cutting off the power supply and closing the gas valve when the hydrogen and oxygen concentrations exceed the limit (hydrogen > 4% or oxygen > 23%). Abnormal temperature or pressure (such as cell temperature > 90°C or pressure > 2 MPa) triggers a three-level alarm and gradually reduces the load until shutdown.

[0049] In order to verify the technical effects of the present invention, through the comparison of the measured data of a 300 MW photovoltaic hydrogen production project, the results are shown in Table 1: Table 1 Comparison results of start-up and operation using the traditional system and this embodiment

[0050] It can be seen that through the collaborative design of hot alkali startup and tower vessel treatment in this embodiment, the startup efficiency and operation stability are significantly improved, providing reliable technical support for renewable energy hydrogen production. This embodiment elaborates in detail the startup operation strategy of the cluster alkaline electrolyzer system. The hot alkali startup process realizes rapid and uniform temperature rise through preheating and circulation pumps. The multi-stage separation and pressure regulation of tower vessel treatment replace liquid level control, improving the dynamic response ability. The load distribution based on photovoltaic prediction and real-time parameter optimization in cluster dynamic regulation. Its efficiency and reliability have been verified in actual projects, providing a standardized solution for large-scale green hydrogen production.

[0051] Upon reading the above description, many embodiments and many applications other than the provided examples will be obvious to those skilled in the art. Therefore, the scope of this teaching should not be determined with reference to the above description, but should be determined with reference to the full scope of the foregoing claims and the equivalents thereof. For the sake of completeness, all articles and references including patent applications and published announcements are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the foregoing claims is not intended to abandon such subject matter, nor should the applicant be regarded as not considering such subject matter as part of the disclosed inventive subject matter.

[0052] The above content is a further detailed description of the present invention. It cannot be determined that the specific implementation of the present invention is limited thereto. For those of ordinary skill in the technical field to which the present invention pertains, without departing from the concept of the present invention, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the scope determined by the protection scope submitted by the present invention.

Claims

1. A startup and operation method for a cluster-type alkaline electrolyzer system, characterized in that, It includes the following steps: In the startup phase, a hot alkali startup process is adopted. The hot alkali startup process includes preheating the alkali solution to a set temperature; In the operation phase, a tower-shaped container is used to independently process the hydrogen and oxygen generated by electrolysis.

2. The startup and operation method of a cluster alkaline electrolyzer system according to claim 1, characterized in that, In the hot alkali startup process, the heating temperature of the alkali solution is 60°C - 90°C, and the alkali solution is evenly distributed in the electrolytic cell through a circulation pump.

3. The startup and operation method of a cluster-type alkaline electrolyzer system according to claim 1, characterized in that, The tower-shaped container includes a hydrogen treatment tower and an oxygen treatment tower, and independently controls the hydrogen and oxygen products through a gas-liquid separation device and a pressure regulating device respectively.

4. The startup and operation method of a cluster-type alkaline electrolyzer system according to claim 1, characterized in that, A multi-stage separation structure is arranged in the hydrogen treatment tower and the oxygen treatment tower to reduce the concentration of the alkali solution entrained in the gas.

5. The startup and operation method of a cluster-type alkaline electrolyzer system according to claim 1, characterized in that, The hot alkali startup process also includes automatic adjustment of the alkali solution concentration, which is used to monitor and adjust the alkali solution concentration to 20% - 30% in real time.

6. A starting and operating method for a cluster-type alkaline electrolyzer system according to claim 1, characterized in that During the operation phase, the system dynamically adjusts the current density and voltage of the electrolytic cell, and the current density and voltage of the electrolytic cell follow the load fluctuations of photovoltaic power generation.

7. A cluster-type alkaline electrolyzer system, characterized in that, Using the startup and operation method of a cluster-type alkaline electrolytic cell described in any one of claims 1 - 6, a cluster control architecture is adopted, including a main controller and multiple sub-controllers. Each sub-controller respectively manages the startup, shutdown and operation parameters of a single electrolytic cell.

8. A cluster-type alkaline electrolyzer system according to claim 7, characterized in that, The main controller dynamically distributes the loads of each electrolytic cell based on the photovoltaic power generation power prediction data to maximize the power consumption efficiency.

9. A cluster-type alkaline electrolyzer system according to claim 7, characterized in that, Safety monitoring modules are equipped in both the startup phase and the operation phase, which are used to detect the hydrogen and oxygen concentrations, temperature and pressure in real time, and trigger an emergency shutdown protection mechanism in case of abnormalities.

10. A cluster-type alkaline electrolyzer system according to claim 7, characterized in that, The system startup time is less than 10 minutes.

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