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CN-122012032-A - Nanofluid and preparation method and application thereof

CN122012032ACN 122012032 ACN122012032 ACN 122012032ACN-122012032-A

Abstract

The invention relates to the field of pumped storage energy storage medium preparation, and discloses a nanofluid, a preparation method and application thereof. The nano fluid provided by the invention comprises nano powder, a dispersing agent and a dispersing medium, wherein the mass ratio of the nano powder to the dispersing agent is (100-340): (0.34-2.6): (150-300), and the dispersing agent comprises one or more of sodium dodecyl sulfate, sodium citrate and polyvinylpyrrolidone. Aiming at the problem that solid particles in a dispersion medium are easy to settle, the invention prevents and inhibits nano powder from being aggregated into large particles to settle by adding the dispersing agent in a specific proportion, and ensures and improves the anti-settling stability of nano fluid by electrostatic stability, steric stability and electrostatic space synergistic stability.

Inventors

  • FEI XIANGZE
  • LI KANG
  • LIU JIALONG
  • KONG SEN
  • LUO ZONGBAO

Assignees

  • 国网电力工程研究院有限公司

Dates

Publication Date
20260512
Application Date
20251209

Claims (10)

  1. 1. A nano-fluid, which is characterized by comprising nano-powder, a dispersing agent and a dispersing medium; the mass ratio of the nano powder to the dispersing agent to the dispersing medium is (100-340): 0.34-2.6): 150-300; the dispersing agent comprises one or more of sodium dodecyl sulfate, sodium citrate and polyvinylpyrrolidone.
  2. 2. The nanofluid of claim 1, wherein the nanopowder comprises one or more of ferric oxide, titanium oxide, copper oxide, barium sulfate, barium titanate.
  3. 3. The nanofluid of claim 1, wherein the dispersion medium comprises one or more of fresh water, seawater, salt lake water, and calcium chloride solution.
  4. 4. A nanofluid according to claim 3, wherein the mass concentration of the calcium chloride solution is 29% -42%.
  5. 5. Nanofluid according to claim 1 or 2, wherein the particle size of the nanopowder is in the range of 15-1000nm.
  6. 6. The nanofluid according to claim 1 or 2, wherein the density of the nanofluid is not less than 1.4g/cm 3 .
  7. 7. A method of preparing a nanofluid according to any one of claims 1 to 6, comprising the steps of: And mixing and stirring the nano powder, the dispersing agent and the dispersing medium to obtain the nano fluid.
  8. 8. The method of claim 7, wherein the stirring is mechanical stirring; optionally, the mechanical stirring device is a stirrer.
  9. 9. The method of claim 8, wherein the mechanical agitation is at a rotational speed of 100-150 r/min.
  10. 10. Pumped storage energy storage medium for pumping working medium of a power storage station, characterized in that the nanofluid according to any one of claims 1-6 or the nanofluid prepared by the method according to any one of claims 7-9 is used.

Description

Nanofluid and preparation method and application thereof Technical Field The invention relates to the field of preparation of pumped storage energy storage media, in particular to a nano fluid and a preparation method and application thereof. Background The pumped storage technology is the most widely applied and mature large-scale energy storage technology in the current power system, and has an irreplaceable effect on guaranteeing the stability of a power grid and the consumption of renewable energy sources. In pumped storage power stations, water is used as a traditional pumping and storage medium, and the conversion of electric energy and potential energy is realized through the circulation flow between an upper reservoir and a lower reservoir. However, the energy density of a system using water as a medium mainly depends on the water level head, and the energy density is limited, so that the scale of a power station is quite huge under the condition of needing the same energy storage capacity, and the problems of difficult site selection, long construction period, high initial investment and the like exist. In order to break through the energy density limit of the traditional water medium, the adoption of the high-density nano fluid as a novel pumping and storage medium has important application potential. The high-density nanofluid refers to a solid-liquid two-phase fluid formed by stably dispersing nano powder in a base liquid. By selecting the high-density nano powder, the density of the whole fluid can be obviously improved, so that the high-density nano powder carries larger kinetic energy and potential energy under the same flow velocity and drop, and the single-machine power and the energy storage density can be greatly improved theoretically. However, the development of the technology still faces a key bottleneck that high-density nano powder is easy to subside and agglomerate in a dispersion medium such as water and seawater, so that the system is unstable and even a pipeline is blocked, and the stability problem is particularly remarkable. Therefore, development of nanofluids having excellent anti-sedimentation stability is urgently required. Disclosure of Invention The invention provides a nano fluid, a preparation method and application thereof. In a first aspect, the present invention provides a nanofluid comprising a nano-powder, a dispersant and a dispersion medium; the mass ratio of the nano powder to the dispersing agent to the dispersing medium is (100-340): 0.34-2.6): 150-300; the dispersing agent comprises one or more of sodium dodecyl sulfate, sodium citrate and polyvinylpyrrolidone. In an alternative embodiment, the nano powder comprises one or more of ferric oxide, titanium oxide, copper oxide, barium sulfate, and barium titanate; optionally, the iron trioxide comprises gamma-ferric oxide. Optionally, the titanium oxide comprises titanium dioxide. And/or the dispersion medium comprises one or more of fresh water, sea water, salt lake water and calcium chloride solution; Preferably, when the dispersing agent is Sodium Dodecyl Sulfate (SDS) or sodium citrate, the dispersing medium is one or more of fresh water, seawater, salt lake water and calcium chloride solution; Preferably, when the dispersing agent is polyvinylpyrrolidone (PVP), the dispersing medium is one or more of fresh water, sea water and salt lake water. In an alternative embodiment, the calcium chloride solution has a mass concentration of 29% to 42%. In an alternative embodiment, the nanopowder has a particle size in the range of 15-1000nm. In an alternative embodiment, the nanofluid has a density of 1.4g/cm 3 or more; Optionally, when the density of the nano fluid is 1.4-2 g/cm 3, the nano powder comprises one or more of titanium oxide, barium sulfate, barium titanate, ferric oxide or copper oxide, and the mass of the dispersing agent accounts for 0.01% -0.7% of the total mass of the nano fluid. Optionally, when the density of the nano fluid is 2-2.5 g/cm 3, the nano powder comprises one or more of ferric oxide, ferric oxide or copper oxide, and the mass of the dispersing agent accounts for 0.01% -0.7% of the total mass of the nano fluid. Optionally, when the density of the nano fluid is more than or equal to 2.5 g/cm 3, the nano powder comprises one or two of ferric oxide and ferroferric oxide, and the mass of the dispersing agent accounts for 0.01-0.7% of the total mass of the nano fluid. In a second aspect, the present invention provides a method for preparing the nanofluid, including the following steps: And mixing and stirring the nano powder, the dispersing agent and the dispersing medium to obtain the nano fluid. In an alternative embodiment, the stirring is mechanical stirring; optionally, the mechanical stirring device is a stirrer. In an alternative embodiment, the mechanical agitation is at a speed of 100 to 150 r/min. In a third aspect, the invention provides a pumped storage energy storage medium for pu