CN102170138B - Large-scale energy storage method based on electricity-aluminium-hydrogen circulating system - Google Patents

Abstract

The invention relates to a large-scale energy storage method based on an electricity-aluminum-hydrogen circulation system. In the method, an electrolytic aluminum device is connected to an output line of a power station, and the electrolytic aluminum device converts excess electric energy into aluminum powder, and the The mineral combination obtained by mixing the aluminum powder and the fly ash of the power plant is put into an aluminum water reaction device to obtain hydrogen, and the hydrogen is converted into electric energy by a hydrogen fuel cell. The aluminum oxide obtained by the reaction of aluminum powder and water can be used as the raw material of the electrolytic aluminum device, thereby being recycled. The invention has the advantages of being clean and efficient, not limited by regions and resources, the energy storage method is flexible and easy to control, and effectively overcomes the disadvantages of hydrogen storage and transportation difficulties.

Description

A large-scale energy storage method based on electricity-aluminum-hydrogen cycle system

technical field

The invention relates to a large-scale energy storage method based on an electricity-aluminum-hydrogen cycle system. The method is to convert the excess power of a power station into electrolytic aluminum and store it in the form of electrolytic aluminum to stably supply power to the grid. It belongs to power stations and Power transmission and transformation application technology field.

Background technique

Due to the rapid development of my country's economic construction and the improvement of people's living standards, the demand for electricity is increasing. Although the country vigorously develops distributed energy systems, it still cannot meet the urgent needs of power load growth.

At present, there are still two major technical obstacles in distributed power generation: one is the connection between distributed power generation and the grid; the other is energy storage. Distributed energy, such as solar and wind energy, has randomness and cannot provide stable power to the grid and regional users. It needs to be equipped with battery packs, inverters and other equipment, which increases the system cost of distributed power generation. In addition, most of the electricity generated by wind power will be wasted during the low power consumption period at night. Therefore, based on system stability and economic considerations, power station energy storage is particularly important.

However, the current energy storage technologies have corresponding shortcomings: the storage capacity of batteries is small, the energy storage life of traditional batteries is short, and the energy density is low, which limits the realization of energy storage in large-scale power stations; the disadvantage of pumped energy storage is that the conversion efficiency is not high, And it is limited by the region and terrain; the way of electrolyzing seawater and using hydrogen to store electrical energy is limited by the difficulty of storing and transporting hydrogen. Therefore, there is an urgent need for a new energy storage method that can alleviate the shortage of power supply.

Metal aluminum has the characteristics of abundant resources, high energy density, low price, and easy storage, and is a promising energy carrier. The reaction of aluminum water releases a large amount of heat and hydrogen. However, ordinary metal aluminum is difficult to achieve the above applications, because the activity of metal aluminum is moderate, and the surface is easy to form a dense oxide film Al ₂ O ₃ , which is firmly attached to the aluminum surface, making the reaction of aluminum water unsustainable. It has been confirmed in engineering practice that high-calcium fly ash provides an alkaline environment. On the other hand, the effective components in fly ash also play a catalytic role in the reaction process. The dense oxide film formed by aluminum in air and water is Under the joint action of ash particles, they are dissolved and destroyed, and directly react with water to produce a large amount of hydrogen, which can completely realize on-site hydrogen production and instant hydrogen supply. The generated high-purity hydrogen can be used to supply power to the grid through hydrogen fuel cells. Al ₂ O ₃ can produce metal aluminum under the action of strong current through the electrolytic aluminum device, so as to achieve the purpose of energy storage in power stations.

Contents of the invention

The purpose of the present invention is to address the above-mentioned deficiencies in the prior art, and provide an indirect energy storage method for a large-scale power station. Using this method, the excess power at low power consumption and at night can be stored in the form of electrolytic aluminum. During peak hours, aluminum powder can be reacted with water to instantly generate a large amount of high-purity hydrogen, which can be stably supplied to the grid through hydrogen fuel cells to achieve peak regulation and improve power efficiency.

The purpose of the present invention is achieved in this way: a large-scale energy storage method based on the electric-aluminum-hydrogen circulation system, the method is to connect the electrolytic aluminum device to the output line of the power station, and the redundant electrolytic aluminum device will Electric energy is converted into aluminum powder, and the aluminum powder is used to mix the fly ash with a mass ratio of 70% to make mineral raw materials and react with water to produce hydrogen. The fly ash in the raw material is used to provide an alkaline environment for aluminum water reaction , and play a catalytic role in the reaction. The hydrogen gas is converted into electric energy by a hydrogen fuel cell, and the aluminum oxide obtained by reacting aluminum powder and water is used as a raw material for the electrolytic aluminum device.

Compared with the existing energy storage technology, the present invention has the following beneficial effects: 1. The energy storage method of the present invention can make full use of low power consumption, such as excess power resources at night, and finally store electric energy in the form of electrolytic aluminum, and the power storage capacity Large; 2. The use of electrolytic aluminum for energy storage is flexible, with little water consumption, and is not subject to geographical restrictions; 3. The alumina obtained from the reaction of aluminum water can be used as a raw material for the electrolytic aluminum process, so that it can be recycled without being limited by resources ; 4. The discharge form is flexible and convenient, avoiding the problems of hydrogen storage and transportation; 5. Using power plant waste - fly ash, to realize waste recycling.

Description of drawings

Fig. 1 is a process flow diagram of the present invention.

Fig. 2 is a structural schematic diagram of the aluminum water reaction device in the present invention.

FIG. 3 is a top view of FIG. 2 .

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

The energy storage method of the present invention is used in various power stations to solve the problems of low power consumption and unusable excess power 1 at night. As shown in accompanying drawing 1, the electrolytic aluminum device 3 is connected to the output line in the power station with the existing transformer rectification device 2. The electrolytic aluminum device 3 and the power transformation and rectification device 2 are existing technologies, and the scale can be large or small. The electrolytic aluminum device 3 is used to convert the excess power of the power station into metal aluminum through the electrolytic aluminum process, and the metal aluminum is used as aluminum powder The production equipment 4 grinds the aluminum powder into aluminum powder. The aluminum powder production equipment is an aluminum powder ball mill, which grinds the aluminum powder to a particle size of less than 0.15mm and stores it for later use. When the regional power consumption peaks, the mineral combination of aluminum powder and fly ash mixed with a mass ratio of 3:7 can be put into the aluminum water reaction device 5, and a large amount of high-purity hydrogen gas will be produced immediately, and the hydrogen gas purity can reach 99.95%. The hydrogen gas is introduced into the hydrogen fuel cell 6 to generate electric energy and stably supply power to the grid. The hydrogen fuel cell 6 is an existing proton exchange membrane fuel cell, and the aluminum oxide produced by the aluminum water reaction device 5 can be used as a raw material for the electrolytic aluminum device 3 for recycling.

The aluminum water reaction device 5 is shown in Figure 2 and Figure 3. The mineral combination of aluminum powder and fly ash enters the reactor through the feed port 7, and at the same time, water is injected from the water inlet 8, and the valve is controlled by the water level change of the connector 9. 10 Opening and closing status and feeding frequency, excess water is discharged from the drain port 11, hydrogen gas generated by the rapid reaction of minerals is discharged from the vent port 12, the hydrogen displacement is controlled by the valve 10, and then the residue is discharged through the double gate valve 13 to realize the process of the entire system continue to operate. The above cumulative frequency is related to the scale of production. 1 kg of this mineral combination can react with water to produce 350 liters of high-purity hydrogen, while consuming 300 g of water.

The embodiments described above are only one of the more preferred specific implementations of the present invention, and the usual changes and replacements performed by those skilled in the art within the scope of the technical solutions of the present invention should be included in the protection scope of the present invention.

Claims (1)

1. extensive energy storage method based on electricity-aluminium-hydrogen circulatory system, use the method the excrescent electric power at low power consumption and the night form with electrolytic aluminium can be stored, when regional peak of power consumption, with aluminium powder and water reaction, at once produce a large amount of, high-purity hydrogen, stable to mains supply by hydrogen fuel cell, to reach the purpose of peak regulation and raising power consumption efficiency, it is characterized in that: its concrete grammar is with the outlet line in the electrolytic aluminium device usefulness power transformation rectifying device access power station, utilize the electrolytic aluminium device and by aluminum electrolysis technology the power station excrescent electric power is changed into metallic aluminium, metallic aluminium is ground to form aluminium powder with production of aluminum powder equipment, described production of aluminum powder equipment is the aluminium powder ball mill device, aluminium powder is ground to particle diameter to store for future use less than 0.15mm, the mineral assemblage that when regional peak of power consumption described aluminium powder and pulverized coal ash is mixed with mass ratio 3:7 drops in the aluminium water reaction unit, at once produce a large amount of, highly purified hydrogen, hydrogen purity reaches 99.95%, described hydrogen is imported in the hydrogen fuel cell, it is stable to mains supply to produce electric energy, described hydrogen fuel cell is Proton Exchange Membrane Fuel Cells, the aluminium oxide that aluminium water reaction unit produces is as the raw material of electrolytic aluminium device, recycling, the mineral assemblage of above-mentioned aluminium powder and pulverized coal ash enters reactor by charging aperture, inject suitable quantity of water by water inlet simultaneously, come by-pass valve control open and-shut mode and the frequency that feeds intake by the SEA LEVEL VARIATION of linker, superfluous water is discharged by discharge outlet, mineral react rapidly generation hydrogen and are discharged by exhaust outlet, the hydrogen displacement size is controlled by valve, afterwards residue is discharged the continuous operation that realizes whole system technique by double gate valve.

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