CN-116885237-B - Operation method of gravity potential energy and heat energy integrated recovery device of all-vanadium redox flow battery

CN116885237BCN 116885237 BCN116885237 BCN 116885237BCN-116885237-B

Abstract

The invention discloses an operation method of an all-vanadium redox flow battery gravitational potential energy and heat energy integrated recovery device, which relates to the technical field of all-vanadium redox flow batteries, and comprises an electrolyte storage tank, a galvanic pile and a shell, wherein the electrolyte storage tank is communicated with the galvanic pile above the electrolyte storage tank through a liquid supply pipe, a circulating pump is arranged on the liquid supply pipe, the galvanic pile is communicated to the shell below the galvanic pile through a liquid outlet pipe, a backflow pipe communicated with the electrolyte storage tank is arranged on the side surface of the bottom of the shell, a power generation mechanism for generating power through gravitational potential energy when electrolyte flows down is arranged in an electrolyte heat exchange cavity of the shell, and a heat exchange mechanism for exchanging heat to the electrolyte is arranged on the inner wall of the shell.

Inventors

YANG HAIQUAN
WANG XIN
ZHANG JIASHUN

Assignees

安徽海螺融华储能科技有限公司

Dates

Publication Date: 20260512
Application Date: 20230131

Claims (3)

1. The operation method of the all-vanadium redox flow battery gravitational potential energy and heat energy integrated recovery device is characterized in that the recovery device comprises an electrolyte storage tank (1), a galvanic pile (3) and a shell (5), wherein the electrolyte storage tank (1) is communicated with the galvanic pile (3) above the electrolyte storage tank through a liquid supply pipe (2), a circulating pump (21) is arranged on the liquid supply pipe (2), the circulating pump (21) is electrically connected to a regulator (9), the galvanic pile (3) is communicated to the shell (5) below through a liquid outlet pipe (4), and a return pipe (6) communicated with the electrolyte storage tank (1) is arranged on the side face of the bottom of the shell (5); The device is characterized in that a power generation mechanism (7) for generating power through gravitational potential energy when electrolyte flows down is arranged in an electrolyte heat exchange cavity (51) of the shell (5), the power generation mechanism (7) comprises a power generator (71), a primary supercharging impeller (73), a flow direction adjusting assembly (74) and a secondary impeller assembly (75), the power generator (71) is arranged in a buffer shell (72) which is arranged at the top of the shell (5) and is communicated with the shell (5), the primary supercharging impeller (73) is arranged on a main shaft (711) of the power generator (71), the flow direction adjusting assembly (74) is provided with a plurality of flow direction adjusting assemblies and is arranged on the side face of the buffer shell (72), and the secondary impeller assembly (75) is arranged at the lower end of the main shaft (711) of the power generator (71); The flow direction adjusting assembly (74) comprises a flow direction adjusting motor (741) and adjusting blades (744), the flow direction adjusting motor (741) is arranged on a fixed base (742) at the outer side of the buffer shell (72), an output shaft of the flow direction adjusting motor (741) is connected with a blade shaft (743) through a coupling, the adjusting blades (744) are positioned in the buffer shell (72) and are arranged on the blade shaft (743), the generator (71) and the flow direction adjusting motor (741) are respectively and electrically connected to the regulator (9), and a power transmission end of the generator (71) is electrically connected to the storage battery; A heat exchange mechanism (8) for exchanging heat to the electrolyte is arranged on the inner wall of the shell (5), the heat exchange mechanism (8) comprises a heat exchange tube (81), a cold water inlet tube (82), a temperature adjusting tube (86) and a hot water outlet tube (84), and the heat exchange tube (81) is positioned in the shell (5); The secondary impeller assembly (75) comprises bearing boxes (751), a blade adjusting shaft (755), side blades (757) and a blade adjusting motor (758), wherein the bearing boxes (751) are provided with a plurality of bearing boxes which are uniformly distributed from top to bottom and are connected with each other by pins, the bearing box (751) at the uppermost end is connected with the lower end of a main shaft (711) of the generator (71) by bolts, the bearing box (751) at the lowermost end is rotationally connected with a fixed bearing seat (753) by thrust bearings (752), the fixed bearing seat (753) is rotationally connected with a cooler baffle plate (754) at the bottom of the shell (5) by bolts, the blade adjusting shaft (755) is rotationally connected with the bearing boxes (751), the side surface of each bearing box (751) is rotationally connected with a plurality of side blades (757) by a rotating shaft (756), a driven bevel gear (7561) arranged at the inner end of each rotating shaft (756) is meshed with a driving bevel gear (7551) on the blade adjusting shaft (755), and the blade adjusting motor (758) is positioned in the fixed bearing seat (753) and the output shaft is rotationally connected with the shaft (755) by a shaft coupler; The cold water inlet pipe (82) is connected with the water inlet of the heat exchange pipe (81), the cold water inlet pipe (82) is provided with a first control valve (83), the water outlet of the heat exchange pipe (81) is connected with the hot water outlet pipe (84), the hot water outlet pipe (84) is provided with a second control valve (85), the water inlet of the temperature adjustment pipe (86) is communicated with the first control valve (83) and the cold water inlet pipe (82) between the water inlet of the heat exchange pipe (81), the water outlet of the temperature adjustment pipe (86) is communicated with the second control valve (85) and the hot water outlet pipe (84) between the water outlet of the heat exchange pipe (81) and the water outlet of the temperature adjustment pipe (86), and the two ends of the temperature adjustment pipe (86) are respectively provided with a third control valve (88) and a fourth control valve (89); A control valve five (22) is arranged on the liquid supply pipe (2) between the electric pile (3) and the circulating pump (21), a pressure sensor (23) is arranged on the liquid supply pipe (2) between the control valve five (22) and the circulating pump (21), and a control valve six (24) is arranged on the liquid supply pipe (2) between the circulating pump (21) and the electrolyte storage tank (1); the operation method of the recovery device comprises the following steps: Step one, a control valve five (22) and a control valve six (24) on a liquid supply pipe (2) are opened, electrolyte is conveyed from an electrolyte storage tank (1) to a galvanic pile (3) through a circulating pump (21) for oxidation-reduction reaction, and a pressure sensor (23) on the liquid supply pipe (2) monitors the pressure of the electrolyte in the liquid supply pipe (2); Step two, after the electrolyte completes the oxidation-reduction reaction in the galvanic pile (3), the electrolyte enters the shell (5) through the liquid outlet pipe (4), the electrolyte drives the primary supercharging impeller (73) on the main shaft (711) to rotate, the main shaft (711) of the generator (71) rotates, the direction of the regulating blade (744) is regulated by the flow direction regulating assembly (74) through the output shaft of the flow direction regulating motor (741), the electrolyte realizes directional confluence under the action of the regulating blade (744), the liquid impacts the secondary impeller assembly (75) again after backflow, the secondary acceleration of the main shaft (711) is realized, the output shaft of the blade regulating motor (758) drives the blade regulating shaft (755) to rotate, and the driving bevel gear (751) and the driven bevel gear (7561) on each bearing box (751) are driven by the driving bevel gear (751), so that the side blade (757) on the rotating shaft (756) rotates by corresponding angles, and the secondary impeller regulating mechanism is independent of the generator driving mechanism relatively, and is not influenced; Step three, electrolyte enters the electrolyte storage tank (1) through the return pipe (6), meanwhile, a first control valve (83) on the cold water inlet pipe (82) is opened, so that cold medium enters the heat exchange pipe (81) to exchange heat with the electrolyte, hot water flows out through the hot water outlet pipe (84), a temperature sensor (87) on the hot water outlet pipe (84) monitors the temperature of the hot water, a real-time temperature value is compared with a temperature initial set threshold value, a second control valve (85) on the hot water outlet pipe (84) is opened after the temperature initial set threshold value is reached, the hot water is taken out for next utilization, and if the real-time temperature value of the hot water does not reach the temperature initial set threshold value, a third control valve (88) and a fourth control valve (89) on the temperature adjustment pipe (86) are opened, the cold medium exchanges heat with the electrolyte again until the temperature is required and then taken out for utilization.
2. The operation method of the gravity potential energy and heat energy integrated recovery device of the all-vanadium redox flow battery according to claim 1, wherein the liquid outlet pipe (4) is provided with a flow regulating valve (41), and the flow regulating valve (41) is electrically connected to the regulator (9).
3. The operation method of the all-vanadium redox flow battery gravitational potential energy and heat energy integrated recovery device according to claim 1 is characterized in that a control valve seven (61) is arranged on the return pipe (6).

Description

Operation method of gravity potential energy and heat energy integrated recovery device of all-vanadium redox flow battery Technical Field The invention relates to the technical field of all-vanadium redox flow batteries, in particular to an operation method of an all-vanadium redox flow battery gravitational potential energy and heat energy integrated recovery device. Background At present, in order to reduce the occupied area of the all-vanadium redox flow battery energy storage power station, a power unit container of the all-vanadium redox flow battery energy storage system is generally stacked on the upper part of a capacity unit container. In the all-vanadium liquid flow energy storage system, firstly, electrolyte is pumped into a pile of a power unit by an electrolyte circulating pump to perform oxidation-reduction reaction, the existing all-vanadium liquid flow energy storage system cannot utilize gravitational potential energy of the electrolyte after the oxidation-reduction reaction is completed by the power unit, the circulating pump is required to continuously pump the electrolyte into the pile to perform reaction in the charging and discharging process, and the circulating pump can only work by external power supply, so that a considerable part of energy loss is caused, and the auxiliary power consumption of the system is not facilitated to be reduced. In addition, a considerable part of heat is generated in the oxidation reaction process of the all-vanadium redox flow battery, and the vanadium ions are precipitated and reacted at too high and too low temperature, so that a galvanic pile is blocked, and potential safety hazards are caused. Therefore, an independent heat exchanger is required to exchange heat with the electrolyte, so that the safe and normal operation of the system is ensured, and after the heat exchange is carried out on the electrolyte which enters the stack by adopting the heat exchanger, heat is directly discharged into the atmosphere through an air conditioner external unit and cannot be utilized by waste heat. Disclosure of Invention The invention aims to provide an operation method of an all-vanadium redox flow battery gravitational potential energy and heat energy integrated recovery device, so as to overcome the defects in the prior art. The operation method of the all-vanadium redox flow battery gravitational potential energy and heat energy integrated recovery device comprises an electrolyte storage tank, a galvanic pile and a shell, wherein the electrolyte storage tank is communicated with the galvanic pile above the electrolyte storage tank through a liquid supply pipe, a circulating pump is arranged on the liquid supply pipe, the galvanic pile is communicated to the shell below the galvanic pile through a liquid outlet pipe, and a return pipe communicated with the electrolyte storage tank is arranged on the side surface of the bottom of the shell; A power generation mechanism for generating power through gravitational potential energy when the electrolyte flows down is arranged in the electrolyte heat exchange cavity of the shell; and a heat exchange mechanism for exchanging heat with the electrolyte is arranged on the inner wall of the shell. Preferably, the power generation mechanism comprises a generator, a primary booster impeller, a flow direction adjusting assembly and a secondary impeller assembly, wherein the generator is arranged in a buffer shell which is arranged at the top of the shell and is communicated with the shell, the primary booster impeller is arranged on a main shaft of the generator, the flow direction adjusting assembly is provided with a plurality of side surfaces which are arranged on the buffer shell, and the secondary impeller assembly is arranged at the lower end of the main shaft of the generator. Preferably, the flow direction adjusting assembly comprises a flow direction adjusting motor and an adjusting blade, the flow direction adjusting motor is arranged on a fixed base on the outer side of the buffer shell, an output shaft of the flow direction adjusting motor is connected with a blade shaft through a coupling, and the adjusting blade is positioned in the buffer shell and is arranged on the blade shaft. Preferably, the secondary impeller assembly comprises a bearing box, a blade adjusting shaft, side blades and a blade adjusting motor, wherein the bearing box is provided with a plurality of driven bevel gears which are uniformly distributed from top to bottom and are connected with two adjacent bearing boxes through pins, the bearing box at the uppermost end is connected with the lower end of a main shaft of the generator through bolts, the bearing box at the lowermost end is rotationally connected with a fixed bearing seat through a thrust bearing, the fixed bearing seat is connected with a cooler partition plate at the bottom of the shell through bolts, the blade adjusting shaft is rotationally connected to the bearing box, the