Testing system and testing method for supercritical carbon dioxide continuous flow corrosion

1 . A testing system for supercritical carbon dioxide continuous flow corrosion, comprising a gas supply system and a closed-loop testing system loop, wherein the closed-loop testing system loop comprises:

a circulation tank connected to the gas supply system, wherein the circulation tank is provided with a feeding inlet and an outlet of the circulation tank, and a liquid carbon dioxide released from the gas supply system enters the circulation tank via the feeding inlet to provide the liquid carbon dioxide for the closed-loop testing system loop;

a circulation pump connected to the outlet of the circulation tank and configured to provide a power of boosting and flowing for a circulation of the liquid carbon dioxide;

a flow meter connected to the circulation pump and configured to measure a flow rate of the liquid carbon dioxide;

a heater connected to the flow meter and configured to vaporize the liquid carbon dioxide into a carbon dioxide gas;

a test section provided with an inlet of the test section and an outlet of the test section, wherein the carbon dioxide gas enters the test section via the inlet of the test section, the test section is configured as a place for storing a sample to be tested and performing a continuous corrosion test, and a tested carbon dioxide gas is discharged via the outlet of the test section;

a regenerator provided with a first inlet of the regenerator and a first outlet of the regenerator, wherein the tested carbon dioxide gas enters the regenerator via the first inlet of the regenerator and exchanges heat with the liquid carbon dioxide flowing into the regenerator, and a heat-exchanged carbon dioxide gas is discharged via the first outlet of the regenerator; and

a condenser provided with an inlet of the condenser and an outlet of the condenser, wherein the inlet of the condenser is connected to the first outlet of the regenerator, so that the heat-exchanged carbon dioxide gas enters the condenser for condensation, and a condensed liquid carbon dioxide is discharged via the outlet of the condenser;

wherein the circulation tank is further provided with an inlet of the circulation tank, and the liquid carbon dioxide discharged from the outlet of the condenser enters the circulation tank via the inlet of the circulation tank, so as to achieve a recycling of the liquid carbon dioxide and form the closed-loop testing system loop.

2 . The testing system of claim 1 , wherein the regenerator is further provided with a second inlet of the regenerator and a second outlet of the regenerator, and the closed-loop testing system loop further comprises a second bypass and a third bypass;

wherein a first end of the second bypass is connected to an outlet of the flow meter, a second end of the second bypass is connected to the inlet of the regenerator, a first end of the third bypass is connected to the second outlet of the regenerator, and a second end of the third bypass is connected to an inlet of the heater; and

wherein the liquid carbon dioxide enters the flow meter via an inlet of the flow meter, a part of the liquid carbon dioxide released from the outlet of the flow meter enters the regenerator via the second bypass and exchanges heat with the carbon dioxide gas entering the regenerator, and a heat-exchanged liquid carbon dioxide is discharged via the second outlet of the regenerator and enters the heater via the third bypass.

3 . The testing system of claim 1 , wherein a mass spectrometer is connected to a pipeline connecting the outlet of the test section and the first inlet of the regenerator, and the mass spectrometer is configured to detect a purity of the tested carbon dioxide gas discharged from the outlet of the test section.

4 . The testing system of claim 1 , wherein the closed-loop testing system loop comprises a plurality of regenerators connected in stages, wherein the first outlet of each stage of regenerator is connected to the first inlet of a next stage of regenerator, so that the plurality of regenerators are sequentially connected in series.

5 . The testing system of claim 4 , wherein the regenerator comprises a first-stage regenerator and a second-stage regenerator, the first-stage regenerator is provided with a first inlet of the first-stage regenerator and a first outlet of the first-stage regenerator, and the second-stage regenerator is provided with a first inlet of the second-stage regenerator and a first outlet of the second-stage regenerator;

wherein the first inlet of the first-stage regenerator is connected to the outlet of the test section, so that the tested carbon dioxide gas enters the first-stage regenerator via the first inlet of the first-stage regenerator for first-stage heat exchanging, to obtain a first-stage heat-exchanged carbon dioxide gas;

wherein the first outlet of the first-stage regenerator is connected to the first inlet of the second-stage regenerator, so that the first-stage heat-exchanged carbon dioxide gas enters the second-stage regenerator via the first inlet of the second-stage regenerator for second-stage heat exchanging to obtain a second-stage heat-exchanged carbon dioxide gas, and the second-stage heat-exchanged carbon dioxide gas is discharged via the first outlet of the second-stage regenerator and enters the condenser.

6 . The testing system of claim 5 , wherein the first-stage regenerator is further provided with a second inlet of the first-stage regenerator and a second outlet of the first-stage regenerator, and the second-stage regenerator is further provided with a second inlet of the second-stage regenerator and a second outlet of the second-stage regenerator;

wherein the second inlet of the second-stage regenerator is connected to an outlet of the flow meter through a second bypass, so that a part of the liquid carbon dioxide released from the outlet of the flow meter enters the second-stage regenerator to provide a cold energy for the second-stage heat exchanging performed in the second-stage regenerator, and a second-stage heat-exchanged liquid carbon dioxide is discharged via the second outlet of the second-stage regenerator;

wherein the second outlet of the second-stage regenerator is connected to the second inlet of the first-stage regenerator, so that the second-stage heat-exchanged liquid carbon dioxide enters the first-stage regenerator to provide a cold energy for the first-stage heat exchanging performed in the first-stage regenerator, and a first-stage heat-exchanged liquid carbon dioxide is discharged via the second outlet of the first-stage regenerator and flows into the heater.

7 . The testing system of claim 1 , wherein the gas supply system comprises a raw material tank configured to store a liquid carbon dioxide raw material, and the raw material tank is provided with a raw material inlet and a raw material outlet.

8 . The testing system of claim 7 , wherein the gas supply system further comprises a booster pump;

wherein the booster pump is provided with an inlet of the booster pump and an outlet of the booster pump, the inlet of the booster pump is connected to the raw material outlet, and the booster pump is configured to boost the liquid carbon dioxide discharged from the raw material tank and transport a boosted liquid carbon dioxide into the circulation tank via the outlet of the booster pump.

9 . The testing system of claim 8 , further comprising a vacuum pump;

wherein the vacuum pump is provided with an inlet of the vacuum pump and an outlet of the vacuum pump, the inlet of the vacuum pump is connected to the outlet of the booster pump, the vacuum pump is configured to perform an airtightness inspection on the gas supply system and extract an air from the gas supply system before the gas supply system is started, and an extracted air is discharged via the outlet of the vacuum pump.

10 . The testing system of claim 9 , wherein the inlet of the vacuum pump is further connected to the feeding inlet, the vacuum pump is configured to perform an airtightness inspection on the closed-loop testing system loop and extract an air from the closed-loop testing system loop before the closed-loop testing system loop is started, and an extracted air is discharged via the outlet of the vacuum pump.

11 . The testing system of claim 10 , wherein the circulation pump is provided with an inlet of the circulation pump and an outlet of the circulation pump, and the flow meter is provided with an inlet of the flow meter and an outlet of the flow meter;

wherein the closed-loop testing system loop further comprises:

a first bypass, wherein a first end of the first bypass is connected to a pipeline between the outlet of the circulation pump and the inlet of the flow meter, and a second end of the first bypass is connected to a pipeline between the inlet of the condenser and the first outlet of the regenerator;

wherein a part of the liquid carbon dioxide entering the circulation pump via the inlet of the circulation pump enters the condenser via the first bypass, so as to adjust the flow rate of the liquid carbon dioxide in the closed-loop testing system loop.

12 . A testing method for supercritical carbon dioxide continuous flow corrosion, using the testing system of claim 1 , comprising:

transporting a liquid carbon dioxide released from the gas supply system into the circulation pump via the circulation tank;

boosting a pressure of the liquid carbon dioxide to a first pressure by the circulation pump, wherein a first part of a boosted liquid carbon dioxide flows into the flow meter;

opening an outlet of the flow meter, so that a first part of the liquid carbon dioxide in the flow meter flows into the heater;

heating the liquid carbon dioxide to a predetermined temperature by the heater, so that the liquid carbon dioxide is transformed into the carbon dioxide gas;

performing a continuous flow corrosion test on the carbon dioxide gas flowing into the test section, wherein the tested carbon dioxide gas is discharged via the outlet of the test section;

performing a heat exchanging on the tested carbon dioxide gas flowing into the regenerator, so as to obtain the heat-exchanged carbon dioxide gas; and

condensing the heat-exchanged carbon dioxide gas via the condenser, so as to obtain the liquid carbon dioxide, wherein the liquid carbon dioxide flows into the circulation tank for recycling.

13 . The method of claim 12 , wherein a second part of the boosted liquid carbon dioxide flows into the condenser via the first bypass, so as to control the flow rate of the liquid carbon dioxide in the testing loop.

14 . The method of claim 12 , wherein a second part of the liquid carbon dioxide released from the flow meter enters the regenerator via the second bypass and exchanges heat with the carbon dioxide gas in the regenerator, and a heat-exchanged liquid carbon dioxide flows into the heater.

15 . The method of claim 12 , further comprising:

detecting a purity of the carbon dioxide gas discharged from the outlet of the test section by using a mass spectrometer.

16 . The method of claim 12 , further comprising: before introducing the liquid carbon dioxide into the testing system,

performing an airtightness inspection on the gas supply system and the closed-loop testing system loop respectively by using a vacuum pump, and extracting an air in the gas supply system and the closed-loop testing system loop.

17 . The method of claim 16 , further comprising: before transporting the liquid carbon dioxide released from the raw material tank to the circulation tank,

boosting the pressure of the liquid carbon dioxide to a second pressure by using a booster pump.