CN-224232661-U - Liquid storage tank for flow battery

Abstract

The utility model discloses a liquid storage tank for a flow battery, which comprises a tank body, wherein the outer wall of the tank body adopts a stepped thickness structure from top to bottom, a liquid level pipe unit is arranged on the outer side of the tank body, the liquid level pipe unit comprises a transparent PVC pipe, a graduated scale, a top interface and a bottom interface which are vertically arranged, the top interface and the bottom interface are connected with the tank body, stop valves are respectively arranged at the top of the tank body, a liquid mixing main pipe is arranged at the top of the tank body, the liquid mixing main pipe is in a closed annular structure and is downwards connected with a plurality of liquid mixing branch pipes, each liquid mixing branch pipe is provided with a middle liquid outlet and a bottom liquid outlet, the liquid mixing main pipe is provided with a vent hole, a manhole flange is arranged at the top of the tank body, the manhole flange adopts a bolt pre-tightening sealing structure, a liquid return flange is further arranged at the top of the tank body, and the liquid return flange is communicated with the liquid mixing main pipe. According to the utility model, efficient electrolyte mixing, accurate inert atmosphere control, non-contact sensing and modularized design are realized through structural design, and cost optimization, high reliability and operation safety are realized.

Inventors

• YIN XIAOHENG
• Qiu Minglei
• YUAN YAN
• CHEN JIA
• TANG GANG
• YAN SU
• Zhao Meibo
• ZHANG ZHEN
• CHEN YANG

Assignees

• 张家港德泰储能装备有限公司

Dates

Publication Date

20260512

Application Date

20250523

Claims (7)

1. 1. The liquid storage tank for the flow battery comprises a tank body (1) and is characterized in that the outer wall of the tank body (1) adopts a stepped thickness structure from top to bottom; The liquid level pipe unit (2) is arranged on the outer side of the tank body (1) and comprises a transparent PVC pipe (13), a graduated scale (18) and a top interface (16) and a bottom interface (15) which are vertically arranged, wherein the top interface (16) and the bottom interface (15) are connected with the tank body (1) and are respectively provided with a stop valve (17); The top of the tank body (1) is provided with a liquid mixing main pipe (11), the liquid mixing main pipe (11) is of a closed annular structure and is downwards connected with a plurality of liquid mixing branch pipes (10), each liquid mixing branch pipe (10) is provided with a middle liquid outlet and a bottom liquid outlet, and the liquid mixing main pipe (11) is provided with a vent hole (12); a manhole flange (3) is arranged at the top of the tank body (1), and the manhole flange (3) adopts a bolt pre-tightening sealing structure; The top of the tank body (1) is also provided with a liquid return flange (6), and the liquid return flange (6) is communicated with a liquid mixing main pipe (11).
2. 2. The liquid storage tank for the flow battery according to claim 1, wherein the surface of the graduated scale (18) is coated with a corrosion-resistant protective coating, and the protective coating is a polytetrafluoroethylene coating.
3. 3. The liquid storage tank for the flow battery according to claim 1, wherein a radar liquid level sensor (4), a pressure sensor (5), a temperature sensor (7) and an electromagnetic switch air valve (8) temperature sensor (7) are integrally arranged at the top of the tank body (1), and each sensor is in non-contact connection with the inside of the tank body (1).
4. 4. The liquid storage tank for the flow battery according to claim 1, wherein an arc-shaped groove is formed in the middle of the graduated scale (18), and the transparent PVC pipe (13) is embedded in the arc-shaped groove to form a clamping structure.
5. 5. The liquid storage tank for the flow battery according to claim 1, wherein the top interface (16) and the bottom interface (15) are connected with the tank body (1) through flange joints, the transparent PVC pipe (13) is connected with the bottom interface (15) and the top interface (16) through flange joints, and the transparent PVC pipe (13) is fixed on the flange joints through anchor clamps (14).
6. 6. The liquid storage tank for the flow battery according to claim 1, wherein the liquid mixing main pipe (11) is of an octagonal closed annular structure, the midpoint of each side is vertically connected with the liquid mixing branch pipe (10), and the direction of a liquid outlet of the liquid mixing branch pipe (10) is consistent with the trend of the liquid mixing main pipe (11).
7. 7. The liquid storage tank for the flow battery according to claim 1, wherein the side wall of the tank body (1) is provided with a ladder rail (9) with a full-surrounding structure, and the top edge of the tank body (1) is also provided with a continuous steel rail.

Description

Liquid storage tank for flow battery Technical Field The utility model belongs to the technical field of flow batteries, and particularly relates to a liquid storage tank for a flow battery. Background Flow batteries are an emerging energy storage technology, and their research and development can be traced back to the 70 s of the 20 th century. Particularly, the Vanadium Redox Flow Battery (VRFB) has the advantages of long service life, high efficiency, deep discharge capacity and the like, and gradually becomes a research hot spot in the field of large-scale energy storage. As the demand for renewable energy storage increases, tank technology, one of the key components, has also experienced significant development. From the early basic design to the current high-performance and multifunctional design, the liquid storage tank technology has made great progress in aspects of corrosion resistance, tightness, intelligent monitoring and the like. Currently, the design of flow battery reservoirs has been developed primarily around improving the cycle efficiency, safety, and life of the battery system. Particularly in terms of material selection, the reservoir needs to have good corrosion resistance for different types of electrolytes (e.g., acidic or alkaline) to cope with the strongly oxidizing environment. In addition, in order to ensure uniform distribution of the valence state of the electrolyte, prevent possible layering phenomenon during charging, the liquid storage tank needs to integrate an effective mixing mechanism. In terms of safety, the reservoir must be able to withstand high pressures and be equipped with an efficient sealing system to avoid leakage. The main flow scheme in the prior art mainly comprises two modes of mechanical circulation mixing and gas bubbling mixing. Wherein, the electrolyte is pumped out from the bottom of the storage tank by the pumping system through the mechanical circulation mixing and is conveyed to the top through the pipeline for reinjection, thereby forming forced convection and promoting the uniform distribution of vanadium ions in different valence states. However, this approach generally only allows for the flow of electrolyte surfaces, and the interior of the tank (especially in corners or bottom areas) is prone to "dead zones", resulting in inadequate mixing, affecting cell consistency and cycle life. The gas bubbling method is to introduce inert gas into the storage tank, and the mixing of the electrolyte is realized by utilizing disturbance generated in the rising process of bubbles. Although the method has simple structure and convenient maintenance, in a large storage tank, due to the limited gas disturbance range, uniform mixing in the whole storage tank is difficult to realize, and particularly, the effect is poorer in the storage tank structure with high aspect ratio, so that the method is limited in application in a large-scale energy storage system. In addition, whether it is mechanical circulation or gas bubbling, the energy consumption of the system is additionally increased, the overall energy efficiency is affected, and therefore, a mixing strategy needs to be further optimized, and auxiliary energy consumption is reduced while the mixing efficiency is improved. Meanwhile, in a large-scale flow battery system, the layout design of a storage tank does not form a mature technical specification, and the problems of reasonably arranging the storage tank, optimizing the pipeline connection, improving the space utilization rate and the like on the premise of ensuring the mixing effect still remain the key points and difficulties of the current research. Disclosure of Invention The embodiment of the utility model aims to provide a liquid storage tank for a flow battery, so as to solve the problems of uneven mixing of electrolyte and high energy consumption, optimize the layout design of a large storage tank and ensure the efficient and stable energy storage operation of the flow battery. In order to solve the technical problems, the liquid storage tank for the flow battery comprises a tank body, wherein the outer wall of the tank body adopts a stepped thickness structure from top to bottom; the liquid level pipe unit is arranged outside the tank body and comprises a transparent PVC pipe, a graduated scale, a top interface and a bottom interface which are vertically arranged and connected with the tank body, and the top interface and the bottom interface are both provided with stop valves; The top of the tank body is provided with a liquid mixing main pipe which is in a closed annular structure and is downwards connected with a plurality of liquid mixing branch pipes, and each liquid mixing branch pipe is provided with a middle liquid outlet and a bottom liquid outlet; a manhole flange is arranged at the top of the tank body, and a bolt pre-tightening sealing structure is adopted for the manhole flange; the top of the tank body is also provided with a liqui