Pumped storage method and system based on high-density liquid

Abstract

The invention relates to a pumped storage method and system based on high-density liquid. The method comprises the steps that S1, two water reservoirs with the height difference are selected or constructed; s2, preparing high-density liquid, and injecting the high-density liquid into the reservoir; s3, monitoring whether an energy storage demand exists or not, and if so, conveying the high-density liquid from the low reservoir to the high reservoir, so that the high-density liquid has gravitational potential energy, and energy storage is formed; s4, monitoring whether a power generation demand exists or not, if yes, introducing the high-density liquid in the high-position water storage reservoir into the low-position water storage reservoir, and promoting a power generation device to generate power by means of gravitational potential energy released by the high-density liquid in the process; the density of the high-density liquid is more than twice that of water. Compared with a traditional pumped storage method and system in the prior art, the energy storage capacity of pumped storage can be effectively improved under the same water level fall, and the situation that the energy storage capacity can be improved only by improving the water level fall in the prior art is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of pumped storage, and particularly relates to a pumped storage method and system based on high-density liquid. Background Art

[0002] Pumped storage is an important energy storage technology that can quickly respond to the power grid demand, release electric energy during peak electricity consumption, store electric energy during low electricity consumption, effectively alleviate the peak-valley difference of the power grid, and ensure the safe and stable operation of the power grid.

[0003] However, the minimum economically viable head of traditional pumped storage power stations is usually about 100 meters, which is greatly restricted by geographical conditions. At the same time, the large amount of work in building reservoirs makes the upfront investment cost of pumped storage power stations high. Due to the restrictions of geographical conditions and investment costs, the wide application of pumped storage is limited.

[0004] In view of this, there is an urgent need for a method that can expand the application scenarios of pumped storage and reduce the investment cost of reservoir construction projects. Summary of the Invention

[0005] In view of this, the present invention provides a pumped storage method and system based on high-density liquid, which can increase the energy storage capacity without increasing the head of the reservoir.

[0006] The first aspect of the present invention discloses a pumped storage method based on high-density liquid, including the following steps:

[0007] S1, select or construct two storage reservoirs with a height difference;

[0008] S2, configure high-density liquid and inject it into the storage reservoirs;

[0009] S3, monitor whether there is an energy storage demand. If so, transport the high-density liquid from the storage reservoir at the lower position to the high-position storage reservoir at the higher position, so that the high-density liquid has gravitational potential energy to form energy storage;

[0010] S4, monitor whether there is a power generation demand. If so, introduce the high-density liquid in the high-position storage reservoir into the low-position storage reservoir, and during this process, use the gravitational potential energy released by the high-density liquid to prompt the power generation device to generate electricity;

[0011] Wherein, the high-density liquid is a liquid with a density more than twice that of water.

[0012] In the present invention, the water storage reservoir can be selected from existing water storage reservoirs or can be a newly constructed water storage reservoir. The so-called height difference refers to the elevation difference between two water storage reservoirs, and based on the existence of this difference, high-density liquid can have gravitational potential energy, so that power generation can be carried out by releasing this gravitational potential energy.

[0013] Since the density of the high-density liquid is more than twice that of water, compared with the existing traditional method of pumped storage based only on the water body drop, under the condition requirements of the same energy storage capacity, the required drop between the water storage reservoirs is reduced by more than half. That is, under the same drop, when energy storage is carried out based on the method of the present invention, the gravitational potential energy of the high-density liquid is more than twice that of the traditional water, or in other words, the capacity of the water storage reservoir can be reduced by more than half. Based on this, there is no need to only increase the water level drop to increase the energy storage capacity as in the prior art, thus greatly reducing the engineering quantity of the reservoir construction project and greatly reducing the investment cost.

[0014] Further, in the step of configuring the high-density liquid in step S2, when configuring the high-density liquid with water as the matrix, it includes: adding a weighting agent with a density greater than that of water to the water matrix to increase the liquid density.

[0015] Further, the density of the weighting agent is more than twice that of water.

[0016] Further, the weighting agent is particulate matter with a particle size of less than 200 microns. Of course, those skilled in the art can also understand that the particulate matter with a particle size structure of less than 200 microns as the weighting agent in the present invention can also be used in combination with a small amount of large particle proppants to achieve the purpose of the present invention, which is also within the protection scope of the present invention, and the present invention does not exclude this. Particularly preferably, in the present invention, the weighting agent is particulate matter with a particle size of less than 100 microns.

[0017] Further, the weighting agent includes: at least one ceramsite, and / or at least one resin, and / or at least one quartz sand, and / or at least one barite, and / or at least one hematite, and / or at least one ilmenite, and / or at least one manganese ore, and / or at least one calcium carbonate, and / or at least one magnesium-aluminum-ferrite spinel, and / or at least one metal oxide, and / or at least one silicate, and / or at least one lead ore, and / or at least one fusible alloy. The weighting agent can be a single substance or a compound of the foregoing multiple types of substances. For example, the weighting agent can be a mixture including silicate and hematite, and the dispersant can include a mixture of clay and cellulose.

[0018] Further, in the step of preparing the high-density liquid, it further includes: adding a dispersant to the water matrix, and the dispersant includes: at least one clay, and / or at least one silicate, and / or at least one lignosulfonate, and / or at least one polycarboxylate, and / or at least one humate, and / or at least one sulfonated polymer, and / or at least one phosphate, and / or at least one cellulose, and / or at least one polymer, and / or at least one oxide.

[0019] By adding the dispersant, the attraction between the weighting agent particles can be reduced, preventing the weighting agent particles from aggregating to form large particles (flocculation), thereby maintaining the uniform dispersion of the particles.

[0020] Further, in the step of preparing the high-density liquid, it further includes: adding a suspending agent to the water matrix, and the suspending agent includes: at least one natural polymer and its derivatives, and / or at least one cellulose and its derivatives, and / or at least one synthetic polymer, and / or at least one surfactant-based thickener, and / or at least one gel-based thickener, and / or at least one clay, and / or at least one silicate.

[0021] By adding the suspending agent, the static viscosity of the liquid can be increased, thereby preventing the weighting agent particles from settling and increasing the suspension time of the weighting agent in the liquid.

[0022] Further, based on the combined configuration of the weighting agent, the dispersant and the suspending agent, the density of the formed high-density liquid is more than twice the density of water, and at the same time, within the maximum energy storage time of energy storage, the weighting agent particles in the high-density liquid do not completely settle to the bottom of the reservoir.

[0023] Further, the weighting agent at least includes ilmenite powder, the dispersant at least includes sodium polycarboxylate and / or polycarboxylic acid ether, and the suspending agent at least includes bentonite or a combination of bentonite and xanthan gum to jointly prepare the high-density liquid. Among them, sodium polycarboxylate as the dispersant adsorbs on the surface of ilmenite particles, generating a steric hindrance effect and electrostatic repulsion, thereby preventing the weighting agent particles from aggregating due to van der Waals forces. In addition, the long side chains of polycarboxylic acid ether can form an adsorption layer on the surface of the ore powder particles serving as the weighting agent. When the ore powder particles approach each other, these adsorption layers will overlap, generating a steric hindrance effect and improving the dispersibility of the ore powder. And bentonite as the suspending agent adsorbs water molecules between layers when encountering water, and its volume can expand by 10 - 15 times, forming a three-dimensional network gel structure, thereby significantly increasing the viscosity of the system. When standing, a high-viscosity gel is formed to prevent particle settlement; when stirring, the fluidity is restored and the flow resistance is reduced. Xanthan gum provides high viscosity when standing; the viscosity decreases when stirring, facilitating pumping and can be compounded with bentonite to make up for the performance loss of bentonite in a high-salt environment.

[0024] In a specific embodiment, based on a total liquid mass of 1000 grams per unit, 600 - 750 grams of ilmenite powder, 200 - 400 grams of water matrix, 1 - 20 grams of sodium polycarboxylate and / or polycarboxylic acid ether, and 10 - 60 grams of bentonite or a combination of bentonite and xanthan gum are provided. Moreover, in this embodiment, a small amount of sodium hydroxide is additionally added to adjust the pH value to neutral.

[0025] Further, in other embodiments, the weighting agent at least includes barite powder, the dispersant at least includes sodium polycarboxylate and / or polycarboxylic acid ether, and the suspending agent at least includes bentonite or a combination of bentonite and xanthan gum, which act together to prepare the high-density liquid. Similarly, sodium polycarboxylate as a dispersant adsorbs on the surface of barite particles, generating steric hindrance and electrostatic repulsion, thereby preventing the aggregation of weighting agent particles due to van der Waals forces. Additionally, the long side chains of polycarboxylic acid ether can form an adsorption layer on the surface of particles serving as the weighting agent. When the weighting agent particles approach each other, these adsorption layers will overlap, generating steric hindrance and improving the dispersibility of the ore powder. Bentonite as a suspending agent adsorbs water molecules between its layers when it encounters water, and its volume can expand by 10 - 15 times, forming a three-dimensional network gel structure, thereby significantly increasing the viscosity of the system. A high-viscosity gel is formed during static settlement to prevent particle sedimentation; fluidity is restored during stirring, reducing the flow resistance. Xanthan gum provides high viscosity during static settlement; the viscosity decreases during stirring, facilitating pumping and can be compounded with bentonite to compensate for the performance loss of bentonite in a high-salt environment.

[0026] In a specific embodiment, based on a total liquid mass of 1000 grams per unit, 600 - 800 grams of barite powder, 150 - 300 grams of water matrix, 1 - 20 grams of sodium polyacrylate and / or polycarboxylic acid ether, and 10 - 60 grams of bentonite or a combination of bentonite and xanthan gum are provided. A small amount of sodium hydroxide is added externally to adjust the pH value to 8 - 10, enhancing the negative charges on the surfaces of bentonite and barite, and synergistically improving the dispersion stability with sodium polycarboxylate.

[0027] Further, in the step of preparing the high-density liquid, it further includes: adding a pH regulator to the water matrix. Among them, the pH regulator includes: at least one inorganic acid, and / or at least one organic acid, and / or at least one inorganic base, and / or at least one organic base, and / or at least one buffer. By adding a pH regulator to the water matrix, the pH value of the high-density liquid can be adjusted to the optimal value.

[0028] The second aspect of the present invention also discloses a system for implementing the pumped-storage energy method based on high-density liquid disclosed in the first aspect of the present invention, including:

[0029] A low-level reservoir located at a low position and a high-level reservoir located at a high position, with a height difference between the two;

[0030] A liquid configuration device, configured to be able to configure a high-density liquid, where the high-density liquid is a liquid with a density more than twice that of water;

[0031] A liquid injection device, configured to be able to inject the high-density liquid into a reservoir;

[0032] A liquid conveying device, configured to be able to lift the high-density liquid from a lower reservoir to a higher reservoir, so that the high-density liquid has gravitational potential energy to form energy storage;

[0033] A monitoring device, configured to monitor whether there is a demand for energy storage and whether there is a demand for power generation;

[0034] A power generation device, configured to be able to generate electricity by means of the gravitational potential energy released by the high-density liquid;

[0035] When the monitoring device monitors that there is a demand for energy storage, the liquid conveying device is operated to work for energy storage; when the monitoring device monitors that there is a demand for power generation, the high-density liquid in the higher reservoir is introduced into the lower reservoir, so as to promote the power generation device to generate electricity by means of the gravitational potential energy released by the high-density liquid.

[0036] Advantageous effects: The pumped-storage method and system based on high-density liquid of the present invention, compared with the traditional pumped-storage methods and systems in the prior art, can effectively increase the energy storage capacity of pumped storage under the same water level drop, or rather, under the requirement of the same energy storage capacity, the required reservoir drop is reduced by more than 1 time, so that there is no need to only increase the water level drop to increase the energy storage capacity as in the prior art, thereby greatly reducing the engineering quantity of reservoir construction projects and greatly reducing the investment cost.

[0037] The pumped-storage method based on high-density liquid of the present invention will be described in detail below in combination with the embodiments shown in the drawings and the reference numerals. Description of the Drawings

[0038] Figure 1 Shows a step flow chart of the pumped-storage method based on high-density liquid of the present invention. Detailed Embodiments

[0039] The technical solutions in the embodiments of the present invention will be described clearly and completely below in combination with the 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0040] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0041] Figure 1 The flowchart of the steps of the pumped - storage energy storage method based on high - density liquid of the present invention is shown. In combination with Figure 1 As shown, the present invention discloses a pumped - storage energy storage method based on high - density liquid, which includes the following steps:

[0042] S1, select or construct two storage reservoirs with a large height difference;

[0043] S2, configure high - density liquid and inject it into the storage reservoirs;

[0044] S3, monitor whether there is an energy storage demand. If so, transport the high - density liquid from the storage reservoir at a low position to the high - altitude storage reservoir at a high position, so that the high - density liquid has gravitational potential energy to form energy storage;

[0045] S4, monitor whether there is a power generation demand. If so, introduce the high - density liquid in the high - altitude storage reservoir into the low - altitude storage reservoir, and during this process, use the gravitational potential energy released by the high - density liquid to prompt the power generation device to generate electricity;

[0046] Among them, the high - density liquid is a liquid with a density more than twice that of water.

[0047] In the present invention, the storage reservoir can be selected from existing storage reservoirs or newly constructed storage reservoirs. The so - called height difference means that there is a difference in altitude between the two storage reservoirs, and based on the existence of this difference, the high - density liquid can have gravitational potential energy, so that power generation can be carried out by releasing this gravitational potential energy.

[0048] Since the density of the high - density liquid is more than twice that of water, compared with the existing traditional pumped - storage energy storage method based only on the water - body height difference, under the condition of the same energy storage capacity requirement, the required height difference between the storage reservoirs is reduced by more than half. That is, when energy storage is carried out based on the method of the present invention under the same height difference, the gravitational potential energy of the high - density liquid is more than twice that of water in the traditional method, or in other words, the capacity of the storage reservoir can be reduced by more than half.

[0049] Based on this, there is no need to only increase the water level drop to increase the energy storage capacity as in the prior art, thus greatly reducing the engineering quantity of reservoir construction projects and greatly reducing the investment cost. For example, if the minimum economically viable drop of the energy storage power station is reduced from 100 meters to 30 meters, it greatly gets rid of the geographical condition limitations of traditional pumped storage (no longer relying on mountains or hills with a drop higher than 100 meters). Another example is that if the capacity of the reservoir to be built is reduced from 100,000 cubic meters to 30,000 cubic meters, the investment cost of building the reservoir is greatly reduced.

[0050] In a specific embodiment, in the step of configuring the high-density liquid in step S2, water is used as the matrix to configure the high-density liquid, including: adding a weighting agent with a density greater than that of water to the water matrix to increase the liquid density.

[0051] In addition, in step S2, the configured high-density liquid is at least injected into the low-positioned lower reservoir. That is to say, at least ensure that there is high-density liquid in the lower reservoir; of course, those skilled in the art can also understand that high-density liquid can also be injected into the high-positioned upper reservoir, so that when power generation demand is detected, the high-density liquid in the upper reservoir can be introduced into the lower reservoir for energy release power generation.

[0052] In a specific embodiment, the density of the weighting agent is more than twice that of water.

[0053] In a specific embodiment, the weighting agent is particulate matter with a particle size of 200 microns or less. Of course, those skilled in the art can also understand that the particulate matter with a particle size structure of 200 microns or less as the weighting agent in the present invention can also be used in combination with a small amount of large particle proppants to achieve the purpose of the present invention, which is also within the protection scope of the present invention, and the present invention does not exclude this.

[0054] Particularly preferably, in the present invention, the weighting agent is particulate matter with a particle size of 100 microns or less. In order to make the weighting agent mix better with water, the smaller the particle size of the weighting agent, the better.

[0055] Among them, the weighting agent includes but is not limited to: at least one ceramsite, and / or at least one resin, and / or at least one quartz sand, and / or at least one barite, and / or at least one hematite, and / or at least one ilmenite, and / or at least one manganese ore, and / or at least one calcium carbonate, and / or at least one magnesium-aluminum-ferrite spinel, and / or at least one metal oxide, and / or at least one silicate, and / or at least one lead ore, and / or at least one fusible alloy.

[0056] In another embodiment, in the step of preparing the high-density liquid, it further includes: adding a dispersant to the water matrix, and the dispersant includes but is not limited to: at least one clay (such as bentonite), and / or at least one silicate, and / or at least one lignosulfonate, and / or at least one polycarboxylate (such as sodium polyacrylate, sodium polycarboxylate, polycarboxylic acid ether), and / or at least one humate (such as sodium humate, potassium humate), and / or at least one sulfonated polymer (such as sulfonated styrene-maleic anhydride copolymer, sulfonated phenolic resin, sulfonated lignite resin), and / or at least one phosphate (such as sodium hexametaphosphate, sodium tripolyphosphate), and / or at least one cellulose (such as sodium carboxymethyl cellulose, polyanionic cellulose), and / or at least one polymer (such as hydrolyzed polyacrylonitrile, hydrolyzed polyacrylonitrile ammonium salt), and / or at least one oxide (such as silicon dioxide).

[0057] By adding the dispersant, the attraction between the weighting agent particles can be reduced, preventing the weighting agent particles from aggregating to form large particles (flocculation), thereby maintaining the uniform dispersion of the particles.

[0058] Following the above embodiment, in the step of preparing the high-density liquid, it further includes: adding a suspending agent to the water matrix, and the suspending agent includes but is not limited to: at least one natural polymer and its derivatives (such as guar gum, carboxymethyl guar gum, hydroxypropyl guar gum, xanthan gum, artemisia sphaerocephala gum, etc.), and / or at least one cellulose and its derivatives (such as hydroxymethyl cellulose, carboxymethyl cellulose, carboxymethyl hydroxyethyl cellulose, hydroxyethyl cellulose, etc.), and / or at least one synthetic polymer (such as polyacrylamide, polyethylene oxide, acrylic polymer, polyvinyl alcohol, etc.), and / or at least one surfactant-type thickener, and / or at least one gel-type thickener (such as the gel formed by the combination of phenolic resin and guar gum with a cross-linking agent), and / or at least one clay (such as montmorillonite, attapulgite, etc.), and / or at least one silicate.

[0059] By adding the suspending agent, the static viscosity of the liquid can be increased, thereby preventing the weighting agent particles from settling and increasing the suspension time of the weighting agent in the liquid.

[0060] In the present invention, based on the combined configuration of the weighting agent, dispersant and suspending agent, the density of the formed high-density liquid is more than twice the density of water, and at the same time, within the maximum energy storage time of energy storage, the weighting agent particles in the high-density liquid do not completely settle to the bottom of the reservoir.

[0061] In some embodiments, the effects of the dispersant and the suspending agent are affected by the pH value of the liquid. It is necessary to add a pH regulator to adjust the pH value of the high-density liquid to the optimum during the step of preparing the high-density liquid. Common pH regulators include, but are not limited to: inorganic acids (such as hydrochloric acid, phosphoric acid, etc.), organic acids (such as citric acid, acetic acid, etc.), inorganic bases (such as sodium hydroxide, potassium hydroxide, sodium carbonate, etc.), organic bases (such as triethanolamine, sodium bicarbonate, etc.) and buffers (such as phosphates, acetates, carbonates, citrates, etc.)

[0062] For example, in a specific embodiment, the weighting agent at least includes ilmenite powder, the dispersant at least includes sodium polycarboxylate and / or polycarboxylic acid ether, and the suspending agent at least includes bentonite or a combination of bentonite and xanthan gum to prepare the high-density liquid. Herein, "at least includes" means that at least ilmenite powder is used as the weighting agent, at least sodium polycarboxylate and / or polycarboxylic acid ether are used as the dispersant, and at least bentonite or a combination of bentonite and xanthan gum are used as the suspending agent. That is, it can be only the aforementioned substance components, or on the premise of having the aforementioned substance components, other similar components can also be included to form a further adjusted formulation.

[0063] Among them, sodium polycarboxylate as the dispersant adsorbs on the surface of ilmenite particles, generating steric hindrance effect and electrostatic repulsion, thereby preventing the weighting agent particles from aggregating due to van der Waals force. In addition, the long side chains of polycarboxylic acid ether can form an adsorption layer on the surface of the ore powder particles serving as the weighting agent. When the ore powder particles approach each other, these adsorption layers will overlap, generating steric hindrance effect and improving the dispersibility of the ore powder. When bentonite serving as the suspending agent encounters water, water molecules are adsorbed between layers, and its volume can expand by 10 - 15 times, forming a three-dimensional network gel structure, thereby significantly increasing the viscosity of the system. A high-viscosity gel is formed during static settlement to prevent particle sedimentation; fluidity is restored during stirring, reducing the flow resistance. Xanthan gum provides high viscosity during static settlement; its viscosity decreases during stirring, facilitating pumping, and its compounding with bentonite can compensate for the performance loss of bentonite in a high-salt environment.

[0064] As described above, by means of the synergistic effect of the dispersant and the suspending agent, while reducing the attraction between the weighting agent particles and preventing the aggregation of the weighting agent particles, the static viscosity of the liquid is increased and the sedimentation of the weighting agent particles is prevented, thus forming a complementarity.

[0065] In a preferred embodiment, based on 1000 grams of the total liquid mass, the specific components are configured as follows: ilmenite powder is 600 - 750 grams, the water matrix is 200 - 400 grams, sodium polycarboxylate and / or polycarboxylic acid ether is 1 - 20 grams, and bentonite or a mixture of bentonite and xanthan gum is 10 - 60 grams. A small amount of sodium hydroxide is added externally to adjust the pH value to 8 - 10, enhancing the negative charges on the surfaces of bentonite and ilmenite powder, and synergistically improving the dispersion stability with sodium polycarboxylate. Specifically, the ilmenite powder is any value within the range of 600 - 750 including the endpoints, the water matrix is any value within the range of 200 - 400 including the endpoints, sodium polycarboxylate and / or polycarboxylic acid ether is any value within the range of 1 - 20 including the endpoints, and bentonite or a mixture of bentonite and xanthan gum is any value within the range of 10 - 60 including the endpoints, as long as the total mass of the liquid after adding these components is 1000 grams.

[0066] In another preferred embodiment, the weighting agent at least includes barite powder, the dispersant at least includes sodium polycarboxylate and / or polycarboxylic acid ether, and the suspending agent at least includes bentonite or a mixture of bentonite and xanthan gum to configure a high-density liquid. Herein, "at least includes" means that at least barite powder is used as the weighting agent, at least sodium polycarboxylate and / or polycarboxylic acid ether is used as the dispersant, and at least bentonite or a mixture of bentonite and xanthan gum is used as the suspending agent. That is, it can be only the aforementioned substance components, or under the premise of having the aforementioned substance components, other similar components can also be included to form a further adjusted formula.

[0067] Similarly, sodium polycarboxylate as the dispersant adsorbs on the surface of barite particles, generating a steric hindrance effect and electrostatic repulsion, thereby preventing the aggregation of weighting agent particles due to van der Waals forces. In addition, the long side chains of polycarboxylic acid ether can form an adsorption layer on the surface of the particles serving as the weighting agent. When the weighting agent particles approach each other, these adsorption layers will overlap, generating a steric hindrance effect and improving the dispersibility of the ore powder. Bentonite as the suspending agent adsorbs water molecules between layers when encountering water, and its volume can expand 10 - 15 times, forming a three-dimensional network gel structure, thereby significantly increasing the viscosity of the system. A high-viscosity gel is formed during static settlement to prevent particle sedimentation; fluidity is restored during stirring, reducing the flow resistance. Xanthan gum provides a high viscosity during static settlement; the viscosity decreases during stirring, facilitating pumping and can be compounded with bentonite to compensate for the performance loss of bentonite in a high-salt environment.

[0068] In a preferred embodiment, based on 1000 grams of the total liquid mass, the specific components are as follows: 600 - 800 grams of barite powder, 150 - 300 grams of water matrix, 1 - 20 grams of sodium polycarboxylate and / or polycarboxylate ether, and 10 - 60 grams of bentonite or a mixture of bentonite and xanthan gum. A small amount of sodium hydroxide is added to adjust the pH value to 8 - 10, enhancing the negative charges on the surfaces of bentonite and barite, and synergistically improving the dispersion stability with sodium polycarboxylate. Specifically, barite can be any value within the range of 600 - 750 including the endpoints, the water matrix can be any value within the range of 200 - 400 including the endpoints, sodium polycarboxylate and / or polycarboxylate ether can be any value within the range of 1 - 20 including the endpoints, and bentonite or a mixture of bentonite and xanthan gum can be any value within the range of 10 - 60 including the endpoints, as long as the total liquid mass after adding these components is 1000 grams.

[0069] In some other embodiments, the weighting agent or dispersant can be a compound of multiple components. For example, the weighting agent can include a mixture of silicate and hematite, and the dispersant can include a mixture of clay and cellulose.

[0070] In some other embodiments, it is necessary to verify through experiments the effects of different combinations of weighting agents, dispersants, and suspending agents on density increase and prevention of weighting agent particle sedimentation, so as to determine the preferred combination.

[0071] The second aspect of the present invention also discloses a system for implementing the pumped - storage method based on high - density liquid disclosed in the first aspect of the present invention, which includes:

[0072] A low - level reservoir at a low position and a high - level reservoir at a high position, with a height difference between the two;

[0073] A liquid configuration device configured to be able to configure high - density liquid, where the high - density liquid is a liquid with a density more than twice that of water;

[0074] A liquid injection device configured to be able to inject high - density liquid into the reservoir;

[0075] A liquid transportation device configured to be able to lift high - density liquid from the low - level reservoir to the high - level reservoir, so that the high - density liquid has gravitational potential energy to form energy storage;

[0076] A monitoring device configured to monitor whether there is an energy storage demand and whether there is a power generation demand;

[0077] A power generation device configured to be able to generate electricity by means of the gravitational potential energy released by high - density liquid;

[0078] When the monitoring device detects an energy storage demand, the liquid delivery device is operated to work for energy storage; when the monitoring device detects a power generation demand, the high-density liquid in the high-level storage reservoir is introduced into the low-level storage reservoir to drive the power generation device to generate electricity by means of the gravitational potential energy released by the high-density liquid.

[0079] Among them, the power generation device can be a preset hydraulic turbine or other existing devices that can generate electricity by means of the gravitational potential energy of the high-density liquid. The liquid delivery device can be a water pump, which can lift the high-density liquid from the low-level storage reservoir to the high-level storage reservoir by means of electric energy to convert the electric energy into the gravitational potential energy of the high-density liquid. The monitoring device can be an existing sensor or controller that receives an electrical signal, which can be realized based on the existing technology and will not be elaborated here. The liquid configuration device can be set to include a configuration container and devices for adding weighting agents, dispersants, and suspending agents to change the water matrix into a high-density liquid.

[0080] For the sake of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "upper...", etc. can be used here to describe the spatial position relationship between a device or feature shown in the figure and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the figure for the device. For example, if the device in the figure is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the corresponding explanations for the spatial relative descriptions used here will be made.

[0081] It should be noted that the terms used here are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used here, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0082] It should be noted that the terms "first", "second", etc. in the description, claims and the above drawings of the present application 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 application described herein can be implemented in an order other than those illustrated or described herein. 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.

[0083] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A pumped storage method based on high-density liquid, characterized in that: The following steps are involved: S1, select or construct two reservoirs with a height difference; S2, prepares a high-density liquid and injects it into the reservoir; S3, monitoring whether there is a demand for energy storage, if so, transporting the high-density liquid from the water reservoir at a low position to the water reservoir at a high position, so that the high-density liquid has gravitational potential energy to form energy storage; S4, monitoring whether there is a demand for power generation, and if so, introducing the high-density liquid in the high-level reservoir into the low-level reservoir, and in this process, using the gravitational potential energy released by the high-density liquid to enable the power generation device to generate electricity; The high-density liquid is a liquid whose density is more than twice that of water.

2. The method according to claim 1, characterized in that In the step of configuring the high-density liquid in step S2, the high-density liquid is configured with water as a matrix, including: adding a weighting agent with a density greater than that of water into the water matrix to increase the density of the liquid.

3. The method according to claim 2, characterized in that The density of the weighting agent is more than twice that of water.

4. The method according to claim 2, characterized in that: The weighting agent is a particle with a particle size of less than 200 microns.

5. The method according to claim 4, characterized in that The weighting agent is a particle with a particle size of less than 100 microns.

6. The method according to any one of claims 2 to 5, characterized in that: The weighting agent includes: at least one ceramsite, and / or at least one resin, and / or at least one quartz sand, and / or at least one barite, and / or at least one hematite, and / or at least one ilmenite, and / or at least one manganese ore, and / or at least one calcium carbonate, and / or at least one magnesia-aluminum-iron spinel, and / or at least one metal oxide, and / or at least one silicate, and / or at least one lead ore, and / or at least one fusible alloy.

7. The method according to claim 6, characterized in that The step of configuring a high-density liquid also includes: adding a dispersant to a water matrix, wherein the dispersant includes: at least one clay, and / or at least one silicate, and / or at least one lignin sulfonate, and / or at least one polycarboxylate, and / or at least one humate, and / or at least one sulfonated polymer, and / or at least one phosphate, and / or at least one cellulose, and / or at least one polymer, and / or at least one oxide.

8. The method according to claim 7, characterized in that The step of preparing the high-density liquid also includes: adding a suspending agent to the water matrix, wherein the suspending agent includes: at least one natural polymer and its derivatives, and / or at least one cellulose and its derivatives, and / or at least one synthetic polymer, and / or at least one surfactant-type thickener, and / or at least one gel-type thickener, and / or at least one clay, and / or at least one silicate.

9. The method according to claim 8, characterized in that Based on the combined configuration of weighting agent, dispersant and suspending agent, the density of the formed high-density liquid is more than twice the density of water. At the same time, within the maximum energy storage time of energy storage, the weighting agent particles in the high-density liquid do not completely settle to the bottom of the water reservoir.

10. The method according to claim 9, characterized in that The weighting agent at least includes ilmenite powder, the dispersant at least includes sodium polycarboxylate and / or polycarboxylate ether, and the suspending agent at least includes bentonite or bentonite and xanthan gum, which work together to configure the high-density liquid.

11. The method according to claim 10, characterized in that Based on a total unit liquid mass of 1000 grams, the ilmenite powder is set to 600-750 grams, the water matrix is ​​set to 200-400 grams, the sodium polycarboxylate and / or polycarboxylate ether is set to 1-20 grams, and the bentonite or bentonite and xanthan gum are set to 10-60 grams.

12. The method according to claim 9, characterized in that The weighting agent at least includes barite powder, the dispersant at least includes sodium polycarboxylate and / or polycarboxylate ether, and the suspending agent at least includes bentonite or bentonite and xanthan gum, which work together to configure the high-density liquid.

13. The method according to claim 12, characterized in that Based on a total unit liquid mass of 1000 grams, the barite powder is set to 600-800 grams, the water matrix is ​​set to 150-300 grams, the sodium polyacrylate and / or polycarboxylate ether is set to 1-20 grams, and the bentonite or bentonite and xanthan gum is set to 10-60 grams.

14. The method according to claim 2, characterized in that The step of preparing the high-density liquid also includes: adding a pH regulator into the water matrix.

15. The method according to claim 14, characterized in that The pH adjuster includes: at least one inorganic acid, and / or at least one organic acid, and / or at least one inorganic base, and / or at least one organic base, and / or at least one buffer.

16. A system for implementing the high-density liquid-based pumped storage method according to any one of claims 1 to 15, characterized in that: include: There is a height difference between the low-lying water reservoir at a low position and the high-lying water reservoir at a high position; A liquid dispensing device configured to dispense a high-density liquid, wherein the high-density liquid is a liquid having a density more than twice that of water; a liquid injection device configured to inject a high-density liquid into the reservoir; A liquid conveying device, which is configured to lift a high-density liquid from a lower reservoir to a higher reservoir, so that the high-density liquid has gravitational potential energy to form stored energy; A monitoring device configured to monitor whether there is a need for energy storage and whether there is a need for power generation; A power generation device configured to generate electricity by utilizing gravitational potential energy released by a high-density liquid; When the monitoring device detects that there is a demand for energy storage, the liquid conveying device is operated to store energy; when the monitoring device detects that there is a demand for power generation, the high-density liquid in the high-level water reservoir is introduced into the low-level water reservoir, so as to use the gravitational potential energy released by the high-density liquid to prompt the power generation device to generate electricity.

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