Carbon dioxide energy storage system, lubricating oil supply device thereof, and control method therefor

1 . A control method for a carbon dioxide energy storage system, wherein the carbon dioxide energy storage system comprises a gas storage unit, an energy storage component, a liquid storage unit, and an energy release component sequentially connected in a closed loop; and the carbon dioxide energy storage system further comprises a lubricating oil supply device; the liquid storage unit is configured to store liquid carbon dioxide, and high-pressure carbon dioxide gas is contained in the liquid storage unit;

wherein the lubricating oil supply device comprises a first oil supply unit and a second oil supply unit respectively connected among a lubricating oil tank, the energy storage component, and the energy release component; the first oil supply unit is configured to supply a first oil amount of lubricating oil to the energy storage component and the energy release component, and the second oil supply unit is configured to supply a second oil amount of the lubricating oil to the energy storage component and the energy release component; the second oil supply unit is connected to the liquid storage unit and driven by taking the high-pressure carbon dioxide gas contained in the liquid storage unit as a power source to supply the lubricating oil; and

wherein the second oil amount is smaller than the first oil amount, and the control method comprises:

controlling the first oil supply unit to supply the lubricating oil to the energy storage component and controlling the second oil supply unit to supply the lubricating oil to the energy release component, when the carbon dioxide energy storage system is in normal operation, the energy storage component is in an energy storage operation condition and the energy release component is in a turning operation condition;

controlling the first oil supply unit to supply the lubricating oil to the energy release component and controlling the second oil supply unit to supply the lubricating oil to the energy storage component, when the carbon dioxide energy storage system is in the normal operation, the energy release component is in an energy release operation condition, and the energy storage component is in the turning operation condition;

controlling the second oil supply unit to simultaneously supply the lubricating oil to the energy storage component and the energy release component when the carbon dioxide energy storage system is in a failing state to cause the first oil supply unit unable to supply the lubricating oil.

2 . The control method as claimed in claim 1 , wherein the second oil supply unit comprises a second oil pump, a second pipeline, and a second driving mechanism; the second oil pump is disposed inside the lubricating oil tank and connected to the energy storage component and the energy release component through the second pipeline; the second driving mechanism is a pneumatic rotary driving mechanism and connected to the liquid storage unit; and the second driving mechanism is configured to drive, under rotation driven by the high-pressure carbon dioxide gas contained in the liquid storage unit, the second oil pump to supply the lubricating oil.

3 . The control method as claimed in claim 2 , wherein the second driving mechanism comprises:

a vane rotary cylinder, connected to the second oil pump and configured to rotationally drive the second oil pump;

a gas pipeline, connected between the liquid storage unit and the vane rotary cylinder and configured to transport the high-pressure carbon dioxide gas in the liquid storage unit to the vane rotary cylinder to thereby drive the vane rotary cylinder to rotate; and

a charged normally closed solenoid valve, connected to the gas pipeline.

4 . The control method as claimed in claim 3 , wherein the carbon dioxide energy storage system further comprises a shaft seal gas storage container, and the shaft seal gas storage container is configured to store shaft seal gas; the second driving mechanism further comprises an exhaust pipeline, the exhaust pipeline is connected between the vane rotary cylinder and the shaft seal gas storage container, the exhaust pipeline is configured to transport carbon dioxide gas discharged by the vane rotary cylinder to the shaft seal gas storage container; and a gas pressure regulating valve is disposed on the gas pipeline.

5 . The control method as claimed in claim 4 , wherein the first oil supply unit comprises a first oil pump, a first pipeline, and a first driving mechanism; the first oil pump is disposed inside the lubricating oil tank and connected to the energy storage component and the energy release component through the first pipeline; and the first driving mechanism is configured to drive the first oil pump;

the first pipeline comprises a first oil supply main pipeline, a first oil supply branch and a second oil supply branch; a first end of the first oil supply main pipeline is connected to an output end of the first oil pump, and first ends of the first oil supply branch and the second oil supply branch are individually connected to a second end of the first oil supply main pipeline; a second end of the first oil supply branch is connected to the energy storage component, and a second end of the second oil supply branch is connected to the energy release component; a first oil supply valve is disposed on the first oil supply branch, and a second oil supply valve is disposed on the second oil supply branch; and

the second pipeline comprises a second oil supply main pipeline, a third oil supply branch and a fourth oil supply branch; a first end of the second oil supply main pipeline is connected to an output end of the second oil pump, and first ends of the third oil supply branch and the fourth oil supply branch are individually connected to a second end of the second oil supply main pipeline; a second end of the third oil supply branch is connected to the energy storage component, and a second end of the fourth oil supply branch is connected to the energy release component; a third oil supply valve is disposed on the third oil supply branch, and a fourth oil supply valve is disposed on the fourth oil supply branch.

6 . The control method as claimed in claim 3 , wherein the first oil supply unit comprises a first oil pump, a first pipeline, and a first driving mechanism; the first oil pump is disposed inside the lubricating oil tank and connected to the energy storage component and the energy release component through the first pipeline; and the first driving mechanism is configured to drive the first oil pump;

the first pipeline comprises a first oil supply main pipeline, a first oil supply branch and a second oil supply branch; a first end of the first oil supply main pipeline is connected to an output end of the first oil pump, and first ends of the first oil supply branch and the second oil supply branch are individually connected to a second end of the first oil supply main pipeline; a second end of the first oil supply branch is connected to the energy storage component, and a second end of the second oil supply branch is connected to the energy release component; a first oil supply valve is disposed on the first oil supply branch, and a second oil supply valve is disposed on the second oil supply branch; and

the second pipeline comprises a second oil supply main pipeline, a third oil supply branch and a fourth oil supply branch; a first end of the second oil supply main pipeline is connected to an output end of the second oil pump, and first ends of the third oil supply branch and the fourth oil supply branch are individually connected to a second end of the second oil supply main pipeline; a second end of the third oil supply branch is connected to the energy storage component, and a second end of the fourth oil supply branch is connected to the energy release component; a third oil supply valve is disposed on the third oil supply branch, and a fourth oil supply valve is disposed on the fourth oil supply branch.

7 . The control method as claimed in claim 2 , wherein the first oil amount is 2-3 times of the second oil amount.

8 . The control method as claimed in claim 7 , wherein the first oil supply unit comprises a first oil pump, a first pipeline, and a first driving mechanism; the first oil pump is disposed inside the lubricating oil tank and connected to the energy storage component and the energy release component through the first pipeline; and the first driving mechanism is configured to drive the first oil pump;

the first pipeline comprises a first oil supply main pipeline, a first oil supply branch and a second oil supply branch; a first end of the first oil supply main pipeline is connected to an output end of the first oil pump, and first ends of the first oil supply branch and the second oil supply branch are individually connected to a second end of the first oil supply main pipeline; a second end of the first oil supply branch is connected to the energy storage component, and a second end of the second oil supply branch is connected to the energy release component; a first oil supply valve is disposed on the first oil supply branch, and a second oil supply valve is disposed on the second oil supply branch; and

the second pipeline comprises a second oil supply main pipeline, a third oil supply branch and a fourth oil supply branch; a first end of the second oil supply main pipeline is connected to an output end of the second oil pump, and first ends of the third oil supply branch and the fourth oil supply branch are individually connected to a second end of the second oil supply main pipeline; a second end of the third oil supply branch is connected to the energy storage component, and a second end of the fourth oil supply branch is connected to the energy release component; a third oil supply valve is disposed on the third oil supply branch, and a fourth oil supply valve is disposed on the fourth oil supply branch.

9 . The control method as claimed in claim 2 , wherein the first oil supply unit comprises a first oil pump, a first pipeline, and a first driving mechanism; the first oil pump is disposed inside the lubricating oil tank and connected to the energy storage component and the energy release component through the first pipeline; and the first driving mechanism is configured to drive the first oil pump;

the first pipeline comprises a first oil supply main pipeline, a first oil supply branch and a second oil supply branch; a first end of the first oil supply main pipeline is connected to an output end of the first oil pump, and first ends of the first oil supply branch and the second oil supply branch are individually connected to a second end of the first oil supply main pipeline; a second end of the first oil supply branch is connected to the energy storage component, and a second end of the second oil supply branch is connected to the energy release component; a first oil supply valve is disposed on the first oil supply branch, and a second oil supply valve is disposed on the second oil supply branch; and

the second pipeline comprises a second oil supply main pipeline, a third oil supply branch and a fourth oil supply branch; a first end of the second oil supply main pipeline is connected to an output end of the second oil pump, and first ends of the third oil supply branch and the fourth oil supply branch are individually connected to a second end of the second oil supply main pipeline; a second end of the third oil supply branch is connected to the energy storage component, and a second end of the fourth oil supply branch is connected to the energy release component; a third oil supply valve is disposed on the third oil supply branch, and a fourth oil supply valve is disposed on the fourth oil supply branch.