阅读说明：本技术 一种均相分布器、电解液储液罐及全钒液流电池储能系统 (Homogeneous phase distributor, electrolyte storage tank and all-vanadium redox flow battery energy storage system ) 是由 杨霖霖 苏秀丽 林友斌 于 2020-06-09 设计创作，主要内容包括：本发明提供一种均相分布器、电解液储液罐及全钒液流电池储能系统,该均相分布器包括：引液装置、预混装置和出液装置,依次沿所述均相分布器中电解液的流动方向布置；所述引液装置包括多个引液管,所述多个引液管上布置有多个扰流孔；所述预混装置,包含预混腔,所述预混腔为回转体腔；所述出液装置,包括出液管和折流装置。本发明通过引液装置一次混合、预混装置二次混合、出液装置三次混合的三级混合设计,使流经均相分布器的电解液更快地进行混合,使得流出电解液储液罐的电解液的荷电态保持较为均匀,有利于全钒液流电池储能系统荷电态采集的稳定性和准确性,保证功率、容量的稳定输出,确保系统稳定工作,提高电池效率。(The invention provides a homogeneous phase distributor, an electrolyte storage tank and an all-vanadium redox flow battery energy storage system, wherein the homogeneous phase distributor comprises: the liquid guiding device, the premixing device and the liquid outlet device are sequentially arranged along the flowing direction of the electrolyte in the homogeneous phase distributor; the liquid guiding device comprises a plurality of liquid guiding pipes, and a plurality of flow disturbing holes are arranged on the plurality of liquid guiding pipes; the premixing device comprises a premixing cavity, and the premixing cavity is a rotator cavity; the liquid outlet device comprises a liquid outlet pipe and a deflection device. According to the invention, through the three-stage mixing design of primary mixing of the liquid guiding device, secondary mixing of the premixing device and tertiary mixing of the liquid outlet device, the electrolyte flowing through the homogeneous phase distributor is mixed more quickly, so that the charge state of the electrolyte flowing out of the electrolyte storage tank is kept relatively uniform, the stability and accuracy of charge state acquisition of the energy storage system of the all-vanadium flow battery are facilitated, the stable output of power and capacity is ensured, the stable work of the system is ensured, and the battery efficiency is improved.)

1. The utility model provides a homogeneous phase distributor, its characterized in that includes draws liquid device, pre-mixing device and goes out the liquid device, is in proper order along the flow direction of electrolyte is linked together and is arranged in the homogeneous phase distributor, wherein:

the liquid guiding device comprises a plurality of liquid guiding pipes which are communicated with each other, a plurality of flow disturbing holes are arranged on the plurality of liquid guiding pipes, the electrolyte is sucked into the plurality of liquid guiding pipes through the plurality of flow disturbing holes and flows into the premixing device after being converged by the plurality of liquid guiding pipes, and the liquid guiding device is used for mixing the electrolyte flowing through the homogeneous phase distributor at one time;

the premixing device comprises a premixing cavity, the premixing cavity is a rotator cavity, the electrolyte enters the premixing cavity after flowing into the premixing device, secondary mixing is carried out in the premixing cavity, the electrolyte after secondary mixing flows into the liquid outlet device, and the premixing device is used for eliminating deviation concentration caused by a suction path and suction time in the suction process of the electrolyte;

the liquid outlet device comprises a liquid outlet pipe and a deflection device, wherein the deflection device is arranged in the liquid outlet pipe to form a liquid outlet flow channel, the electrolyte flows into the liquid outlet device and then enters the liquid outlet flow channel, the electrolyte flows out of the homogeneous phase distributor after being mixed for three times in the liquid outlet flow channel through the deflection device, and finally the homogeneous phase is mixed.

2. The homogeneous distributor of claim 1, wherein the plurality of draw tubes are arranged in a geometric pattern to facilitate the drawing device to draw the electrolyte sufficiently, the geometric pattern comprising at least one of:

the shape of the radiation is radial;

net shape;

a rectangle shape;

a circular shape;

and a cross shape.

3. The homogeneous phase distributor according to claim 1, wherein the plurality of baffle holes are distributed along the surface of the plurality of liquid guiding pipes, the electrolyte enters the homogeneous phase distributor through the baffle holes, and the baffle holes disturb the flow of the electrolyte to realize primary mixing of the electrolyte.

4. The homogeneous distributor according to claim 1, wherein a mixing rotor is disposed within the premixing chamber, the mixing rotor being rotatably secured within the premixing chamber for enhancing secondary mixing of the electrolyte.

5. The homogeneous distributor according to claim 4, wherein the mixed flow rotor is provided with rotor blades, and the electrolyte flows in the homogeneous distributor and can drive the rotor blades to rotate.

6. A homogeneous distributor according to claim 1 wherein said exit flow channels are baffled flow channels to enhance tertiary mixing of said electrolyte by the baffling effect of said baffled flow channels.

7. The homogeneous distributor of claim 6, wherein the baffled flow channels are shaped to include at least one of:

a spiral flow channel;

a serpentine flow channel;

a tooth-shaped flow passage.

8. The homogeneous distributor of any one of claims 1 to 7, wherein the homogeneous distributor is made of a corrosion resistant material.

9. An electrolyte reservoir comprising the homogeneous distributor as set forth in claim 8, said electrolyte reservoir storing said electrolyte, said homogeneous distributor being immersed in said electrolyte, said electrolyte flowing through said homogeneous distributor to a return outlet of said electrolyte reservoir.

10. An all-vanadium redox flow battery energy storage system, which is characterized by comprising a driving device, a liquid conveying pipe, an electric pile and an electrolyte storage tank according to claim 9.

Technical Field

The invention relates to the technical field of electrochemical energy storage, in particular to a homogeneous phase distributor, an electrolyte storage tank and an all-vanadium redox flow battery energy storage system.

Background

The vanadium redox flow battery is one of the most mature flow batteries in the prior art, and the redox reaction is generated on the surface of an electrode through a redox couple formed by vanadium ions with different valence states in an electrolyte solution, so that the mutual conversion of electric energy and chemical energy is completed, and the storage and the release of the electric energy are realized. The positive electrode adopts a VO2+/VO2+ couple, the negative electrode adopts a V3+/V2+ couple, sulfuric acid is used as supporting electrolyte, and water is used as solvent. And the anode and cathode electrolyte stock solutions are both V3+/V4+ solutions, and after the electrolytes are activated, the electrolytes enter the inside of the pile under the drive of a pump to generate an oxidation-reduction reaction in the normal charging and discharging process, and then return to the anode and cathode electrolyte storage tanks. At this time, the charge state of the electrolyte at the upper part of the storage tank is higher than that of the electrolyte at the lower part of the storage tank, which causes the concentration distribution of the electrolyte components to be unbalanced. And the components in the electrolyte storage tank are not uniformly distributed, so that the difficulty is brought to the accurate collection of the charge state of the battery system. In addition, when the concentration distribution of the components in the electrolyte storage tank is not uniform, the concentration of the electrolyte delivered to each stack will deviate, which has a certain effect on ensuring the consistency of the stack performance. Therefore, it is important to solve the problem of uneven distribution of the concentration of the components in the electrolyte tank.

Patent CN104538662A provides a flow cell system, in which a distributor is arranged at the inlet of an electrolyte storage tank to ensure uniform concentration of electrolyte entering the cell stack as much as possible.

Patent CN206022527U discloses a solution valence state balancing device of an all-vanadium redox flow battery, in which electrolyte is homogenized by adopting a forced power stirring mode.

The above prior art has at least the following problems:

(1) the distributor is arranged at a return inlet or a return outlet of the electrolyte storage tank, but the tank body is of a square or cylindrical structure, so that the diffusion homogeneous phase cannot be fully realized; a distributor is arranged at a liquid return inlet at the top of the electrolyte storage tank, so that liquid cannot be sprayed to each corner of the tank body; in addition, after the liquid contacts the liquid in the tank, the liquid mainly sinks through the original kinetic energy and gravitational potential energy, so that the uniform diffusion of the concentration of the liquid is difficult to ensure; in addition, the flow rate of the flow battery system is large, and sufficient dispersion time cannot be provided to ensure uniform diffusion of the electrolyte concentration.

(2) Adopt electronic stirring mixed mode, can't satisfy practical application from installation space and equipment bearing aspect, all vanadium redox flow battery is when designing simultaneously, and the external equipment that should consider as far as possible avoids consuming the electric energy, otherwise hardly guarantees its economic nature.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a homogeneous phase distributor, an electrolyte storage tank and an all-vanadium redox flow battery energy storage system, which can effectively solve the problem of uneven concentration distribution of electrolyte in the electrolyte storage tank.

In order to achieve the purpose, the technical scheme of the invention is as follows:

the invention provides a homogeneous phase distributor, which comprises a liquid guiding device, a premixing device and a liquid outlet device, which are sequentially communicated and arranged along the flowing direction of electrolyte in the homogeneous phase distributor, wherein:

the liquid guiding device comprises a plurality of liquid guiding pipes which are communicated with each other, a plurality of flow disturbing holes are arranged on the plurality of liquid guiding pipes, the electrolyte is sucked into the plurality of liquid guiding pipes through the plurality of flow disturbing holes and flows into the premixing device after being converged by the plurality of liquid guiding pipes, and the liquid guiding device is used for mixing the electrolyte flowing through the homogeneous phase distributor at one time so as to realize the primary mixing of ions with different valence states in the electrolyte;

the premixing device comprises a premixing cavity, the premixing cavity is a rotator cavity, the electrolyte enters the premixing cavity after flowing into the premixing device, secondary mixing is carried out in the premixing cavity, the electrolyte after secondary mixing flows into the liquid outlet device, and the premixing device is used for eliminating deviation concentration caused by a suction path and suction time in the suction process of the electrolyte;

the liquid outlet device comprises a liquid outlet pipe and a deflection device, wherein the deflection device is arranged in the liquid outlet pipe to form a liquid outlet flow channel, the electrolyte flows into the liquid outlet flow channel after flowing into the liquid outlet device, and flows out of the homogeneous phase distributor after three times of mixing in the liquid outlet flow channel, so that the homogeneous phase mixing state is finally achieved.

The homogeneous distributor as described above, wherein the plurality of liquid introduction tubes are arranged in a geometric pattern so that the liquid introduction device sufficiently sucks the electrolyte, and the geometric pattern includes at least one of: the shape of the radiation is radial; net shape; a rectangle shape; a circular shape; and a cross shape.

Above-mentioned homogeneous phase distributor, wherein, a plurality of vortex holes are followed the surface distribution of a plurality of liquid guide pipes, electrolyte passes through the vortex hole gets into in the homogeneous phase distributor, the vortex hole pair the flow of electrolyte produces the disturbance, in order to realize the primary mixing of electrolyte.

In the above homogeneous distributor, the premixing chamber is provided with a mixed flow rotor, and the mixed flow rotor is rotatably fixed in the premixing chamber and used for enhancing secondary mixing of the electrolyte.

The homogeneous phase distributor is characterized in that the mixed flow rotor is provided with rotor blades, and the electrolyte flows in the homogeneous phase distributor and can drive the rotor blades to rotate.

In the homogeneous distributor, the liquid outlet channel is a baffling channel, so that the tertiary mixing of the electrolyte is enhanced by the baffling effect of the baffling channel.

The homogeneous distributor as described above, wherein the shape of the baffled flow channels comprises at least one of: a spiral flow channel; a serpentine flow channel; a tooth-shaped flow passage.

The homogeneous phase distributor is made of a corrosion-resistant material.

In a second aspect of the present invention, an electrolyte storage tank is provided, which includes the homogeneous phase distributor according to any one of the first aspect of the present invention, the electrolyte storage tank stores the electrolyte, the homogeneous phase distributor is immersed in the electrolyte, and the electrolyte flows through the homogeneous phase distributor and then flows to a return outlet of the electrolyte storage tank.

In a third aspect of the invention, an all-vanadium redox flow battery energy storage system is provided, which comprises a driving device, a liquid conveying pipe, a galvanic pile and the electrolyte storage tank of any one of the second aspect of the invention.

The positive progress effects of the invention are as follows:

(1) according to the invention, through the design of three-stage mixing of primary mixing, secondary mixing and tertiary mixing, the electrolyte flowing through the homogeneous phase distributor is mixed more quickly, so that the charge state of the electrolyte flowing out of the electrolyte storage tank is kept relatively uniform, the stability and accuracy of charge state acquisition of the all-vanadium redox flow battery system are facilitated, the stable output of power and capacity is ensured, the stable work of the system is ensured, and the battery efficiency is improved.

(2) The homogeneous phase distributor provided by the invention is a static homogeneous phase distributor, and in the working process of the homogeneous phase distributor, the electric energy does not need to be consumed, so that the economy of a battery system is ensured while the performance of the all-vanadium redox flow battery is improved.

(3) The homogeneous phase distributor provided by the invention is integrated in the electrolyte storage tank, is made of corrosion-resistant materials, and can realize maintenance-free operation throughout the life, so that the operation and maintenance cost is saved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the apparatus and method consistent with the invention and, together with the detailed description, serve to explain the advantages and principles consistent with the invention. In the drawings:

FIG. 1 is a schematic diagram of a homogeneous phase distributor according to an embodiment of the present invention;

FIG. 2 is a schematic view of an electrolyte reservoir according to a second embodiment of the present invention;

fig. 3 is a diagram of an energy storage system of an all-vanadium redox flow battery according to a third embodiment of the invention.

Description of reference numerals:

1-homogeneous phase distributor;

11-a liquid-guiding device; 12-a premixing device; 13-a liquid outlet device;

111-a liquid guiding tube; 112-a burbling hole;

121-a premix chamber; 122-mixed flow rotor; 123-rotor blades;

131-a liquid outlet pipe; 132-a baffle; 133-liquid outlet flow channel;

2-an electrolyte;

3-an electrolyte storage tank;

31-a liquid return outlet; 32-a liquid return inlet;

4-an all-vanadium redox flow battery energy storage system;

5-a drive device;

6-an infusion tube;

7-electric pile.

Detailed Description

Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described below. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other, and the technical idea of the present invention may be implemented in combination with other known techniques or other techniques identical to those known techniques.