CN106896054B - Supercritical carbon dioxide corrosion experimental device - Google Patents
Supercritical carbon dioxide corrosion experimental device Download PDFInfo
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Abstract
The utility model provides a supercritical carbon dioxide corrodes experimental apparatus, includes carbon dioxide air supply, preheater and corrosion reaction cauldron, and the export of carbon dioxide air supply is linked together through booster pump and preheater entry, and the preheater export is linked together with the corrosion reaction cauldron that is used for placing the sample, and the exit linkage of corrosion reaction cauldron has cooling system. According to the invention, the carbon dioxide gas source, the booster pump, the corrosion reaction kettle and the cooling system are arranged, the carbon dioxide gas source enters the corrosion reaction kettle after being boosted by the booster pump, and the condensing system is arranged behind the corrosion reaction kettle, so that the condensing rate of the gas is improved, and the stability and the safety of the system are improved. The device has simple structure, and can simply and effectively realize the test of the material in the high-temperature supercritical carbon dioxide (S-CO) under the laboratory condition2) Corrosion behavior under conditions.
Description
Technical Field
The invention relates to a material corrosion experimental device, in particular to a supercritical carbon dioxide corrosion experimental device.
Background
Supercritical carbon dioxide (S-CO)2) The Brayton cycle uses carbon dioxide (critical pressure 7.38MPa, critical temperature 30.98 ℃) in a supercritical state as a working medium, and realizes energy conversion by adopting the Brayton cycle principle. S-CO compared to steam power cycle currently used on a large scale2The energy conversion efficiency of the Brayton cycle at high temperature (generally higher than 400 ℃) is higher, and the volume of a turbine system and cooling equipment is only one tenth of that of corresponding equipment of a steam system; compared with the conventional gas Brayton cycle, the characteristic that the parameters of the compression process are near the critical point of the working medium enables the compression power consumption to be obviously reduced and the cycle efficiency to be obviously improved. Supercritical carbon dioxide (S-CO)2) The Brayton cycle has potential application in novel combustion engines, fourth generation nuclear power, thermal power and solar generator sets due to its own technical advantages. S-CO relative to System design2The corrosion behavior of alloy in critical components of brayton cycle systems, such as turbines, heat exchangers, piping, etc., will be one of the important factors in determining system safety and component life.
Generally, it is believed that at lower temperatures: (<400 ℃) dried, pure S-CO2The fluid is stable and reacts very slowly with the contacting metal parts (pressure vessels, piping, power parts, etc.). In CO2Capture and storage, CO2Transport, supercritical CO2In the brayton cycle system, the doping of water vapor, sulfur-containing gas (of the order of 1 mg/L), air, etc. is inevitable and causes the occurrence of corrosion. At higher temperatures, e.g. supercritical CO2CO in Brayton cycle thermal power unit2Can reach 650 ℃/25MPa or higher even with ultra-pure CO2As a flowing medium, some corrosion of critical components in the system may still occur. The degree of corrosion is closely related to the alloy material, temperature, pressure and other environmental parameters.
Thus, supercritical carbon dioxide (S-CO)2) When the Brayton cycle is applied to a generator set, the supercritical carbon dioxide corrosion behavior of the alloy is very necessary to be inspected, and the corrosion mechanism of the alloy in a service environment is analyzed. But taking into account electricityThe problem of power generation efficiency of a plant is that actual measurement experiments are difficult to develop in the power plant, so that laboratory test equipment capable of effectively simulating the operation conditions of a boiler is needed to be developed. The alloys currently concerned are in S-CO2The research reports of corrosion behaviors in the environment are relatively few, the used corrosion experiment device does not have a high-pressure condition, the experiment parameters of the device are far lower than the target parameters (750 ℃, 30MPa) of a supercritical carbon dioxide circulating thermal power generation system, and the experiment requirement of high-temperature high-pressure dynamic corrosion cannot be simulated. Therefore, the research and development of supercritical carbon dioxide (S-CO) are performed in consideration of the corrosion resistance of the alloy to the supercritical carbon dioxide2) The importance of the Brayton cycle generator set is that the design of a supercritical carbon dioxide high-temperature high-pressure corrosion resistance laboratory test device which can effectively simulate the operation condition of a boiler is urgent, the problem of supercritical carbon dioxide corrosion is solved, and a theoretical basis and a new idea are provided for a high-parameter supercritical carbon dioxide power generation technology.
Disclosure of Invention
To overcome the drawbacks of the prior art, the object of the present invention is to address the problem of supercritical carbon dioxide (S-CO)2) The Brayton cycle provides a method for simply and effectively realizing the test of the material under the conditions of high temperature and high pressure supercritical carbon dioxide (S-CO) in a laboratory2) Dynamic circulation supercritical carbon dioxide corrosion experimental device of corrosion behavior under condition.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a supercritical carbon dioxide corrosion experimental device comprises a carbon dioxide gas source, a preheating furnace and a corrosion reaction kettle for placing a sample, wherein an outlet of the carbon dioxide gas source is communicated with an inlet of the preheating furnace through a booster pump and a quantitative injection container, an outlet of the preheating furnace is communicated with an inlet of the corrosion reaction kettle, and an outlet of the corrosion reaction kettle is connected with a cooling system; and the preheating furnace is provided with a temperature control thermocouple for controlling the temperature of the preheating furnace.
The invention is further improved in that the booster pump is connected with an air compressor.
The invention is further improved in that the outlet of the booster pump is communicated with the quantitative injection container through a high-pressure storage tank.
The invention is further improved in that the quantitative injection container is connected with a high-pressure advection pump.
The invention is further improved in that the corrosion reaction kettle is arranged in the kettle body heating furnace.
The invention has the further improvement that the top and the bottom of the corrosion reaction kettle are provided with quick-opening valves, and the corrosion reaction kettle is also provided with a kettle body temperature thermocouple.
The further improvement of the invention is that the cooling system comprises a condenser and a gas-liquid separator, and the outlet of the high-pressure reaction kettle is connected with the gas-liquid separator through a pipeline, a back pressure valve and the condenser.
The invention has the further improvement that the outlet of the gas-liquid separator is communicated with the inlet of the dryer through a pipeline and a valve, and the outlet of the dryer is connected with a carbon dioxide gas source.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the carbon dioxide gas source is pressurized by the booster pump, the quantitative injection container is used for injecting a certain amount of carbon dioxide into the preheating furnace according to experiment requirements, the temperature in the preheating furnace is controlled in real time by arranging the temperature control thermocouple in the preheating furnace, then the carbon dioxide enters the corrosion reaction kettle, and the condensation system is arranged behind the corrosion reaction kettle, so that the condensation rate of gas can be improved, and the stability and the safety of the system can be improved. The device has simple structure, and can simply and effectively realize the test of the material in the high-temperature supercritical carbon dioxide (S-CO) under the laboratory condition2) Corrosion behavior under conditions.
Furthermore, the cooling system is connected with the carbon dioxide gas source to form a medium flow loop, so that the dynamic circulation of the carbon dioxide is realized, the operation conditions of the boiler can be truly simulated, and the cost is effectively saved.
Further, through setting up cauldron body heating furnace, can heat the required temperature of corrosion experiment to carbon dioxide again.
Drawings
FIG. 1 is a schematic diagram of the apparatus of the present invention.
Wherein: 1. a source of carbon dioxide gas; 2. a dryer; 3. an air compressor; 4. a booster pump; 5. a high pressure storage tank; 6. a dosing container; 7. a high-pressure advection pump; 8. preheating a furnace; 9. corroding the reaction kettle; 10. a condenser; 11. a gas-liquid separator; 12. a back pressure valve; 13. a temperature thermocouple; 14. a temperature control thermocouple; 15. and (4) a valve.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, the invention comprises a carbon dioxide gas feeding system, a preheating furnace 8 and a corrosion reaction kettle 9 which are connected in sequence through pipelines, wherein carbon dioxide is from a 99.9998% carbon dioxide gas source 1 and carbon dioxide dried by a dryer 2; the carbon dioxide gas supply system comprises a carbon dioxide gas source 1, an outlet of the carbon dioxide gas source 1 is connected with a booster pump 4 through a valve, and the booster pump 4 is connected with an air compressor 3; the air source enters a high-pressure storage tank 5 after being pressurized by a booster pump 4; the outlet of the high-pressure storage tank 5 is connected with the inlet of the quantitative injection container 6, the outlet of the quantitative injection container 6 is communicated with the inlet of the preheating furnace 8, and the outlet of the preheating furnace 8 is communicated with the inlet of the corrosion reaction kettle 9; the quantitative injection container 6 is connected with a high-pressure advection pump 7, and valves are respectively arranged at the inlet and the outlet of the quantitative injection container 6 to control the flow rate of an air source; an air source with a proper flow rate is controlled to enter a preheating furnace 8, a temperature control thermocouple 14 for controlling the temperature of the preheating furnace is installed on the preheating furnace 8, an outlet of the preheating furnace 8 is communicated with a high-pressure reaction kettle 9 which is arranged in a kettle body heating furnace and used for placing a component to be tested through a pipeline, kettle body temperature measurement thermocouples 13 are arranged on a corrosion reaction kettle 9, quick-opening valves are arranged at the top and the bottom of the corrosion reaction kettle 9, and an outlet of the high-pressure reaction kettle 9 is connected with a gas-liquid separator 11 through a pipeline, a back pressure valve 12 and a condenser 10; the outlet of the gas-liquid separator 11 is communicated with the inlet of the dryer 2 through a pipeline and a valve 15, the gas source separated by the gas-liquid separator 11 enters the dryer 2 through the pipeline, and the outlet of the dryer 2 is communicated with the carbon dioxide gas source 1, so that the gas is recycled.
The working process of the invention is as follows: the preparation before the device is operated comprises the steps of checking a gas source, installing a sample, emptying a system, arranging a booster pump 4 and quantitatively injecting a container 6. The gas source is first checked to ensure that the carbon dioxide source is sufficient and gas-tight, and the sample is then mounted. The sample mounting means that a sample is fixed on a sample rack and placed in the corrosion reaction kettle 9. The evacuation system means that the back pressure valve 12 and the valve 15 are closed, the valve on the corrosion reaction kettle 9 is opened, the gas source required by the test is introduced into the corrosion reaction kettle 9, and other fluids are discharged. A booster pump 4 and a dosing reservoir 6 are provided, including pressure and flow settings.
And (3) normal state: with a booster pump 4 and a quantitative injection container 6 as starting points, the supercritical carbon dioxide flows forwards under the pressure action of the booster pump 4, and enters a steam preheating furnace 8 for heating after the flow is stabilized and the pressure fluctuation is buffered by the quantitative injection container 6 and a high-pressure constant-flow pump 7 to reach the specified steam preheating temperature of about 350-650 ℃; then the fluid enters the kettle body heating furnace through a pipeline, is heated again by the kettle body heating furnace to reach the temperature required by the experiment, and enters the high-pressure reaction kettle 9 from the bottom of the furnace body. The gas source from the autoclave 9 passes through the backpressure valve 12, is decompressed and then is cooled by the condenser 10, and the fluid is condensed and liquefied. The condensed fluid enters the gas-liquid separator 11 through a pipeline and is then introduced into the dryer 2 through a pipeline, thereby realizing recycling.
When the experiment is finished, firstly, the gas source valve is closed, the booster pump 4 and the quantitative injection container 6 are closed, then the preheating furnace 8 and the corrosion reaction kettle 9 are closed, the corrosion reaction kettle 9 is slowly cooled to the room temperature along with the furnace, and the quick-opening valve is opened to take out the sample. The normal experiment generally does not need the intervention of experimenters, and the system automatically runs.
Claims (1)
1. A supercritical carbon dioxide corrosion experimental device is characterized by comprising a carbon dioxide gas source (1), a preheating furnace (8) and a corrosion reaction kettle (9) for placing a sample, wherein an outlet of the carbon dioxide gas source (1) is communicated with an inlet of the preheating furnace (8) through a booster pump (4) and a quantitative injection container (6), an outlet of the preheating furnace (8) is communicated with an inlet of the corrosion reaction kettle (9), and an outlet of the corrosion reaction kettle (9) is connected with a cooling system; a temperature control thermocouple (14) for controlling the temperature of the preheating furnace (8) is arranged on the preheating furnace (8);
the quantitative injection container (6) is connected with a high-pressure advection pump (7);
the corrosion reaction kettle (9) is arranged in the kettle body heating furnace;
the cooling system comprises a condenser (10) and a gas-liquid separator (11), and an outlet of the high-pressure reaction kettle (9) is connected with the gas-liquid separator (11) through a pipeline, a back pressure valve (12) and the condenser (10);
the booster pump (4) is connected with an air compressor (3);
the outlet of the booster pump (4) is communicated with a quantitative injection container (6) through a high-pressure storage tank (5);
quick-opening valves are arranged at the top and the bottom of the corrosion reaction kettle (9), and a kettle body temperature thermocouple (13) is also arranged on the corrosion reaction kettle (9);
the outlet of the gas-liquid separator (11) is communicated with the inlet of the dryer (2) through a pipeline and a valve (15), and the outlet of the dryer (2) is connected with the carbon dioxide gas source (1).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107449728B (en) * | 2017-07-31 | 2020-10-30 | 中国核动力研究设计院 | High-temperature high-pressure supercritical carbon dioxide uniform corrosion test system |
| CN107436260B (en) * | 2017-07-31 | 2019-11-05 | 中国核动力研究设计院 | A kind of high temperature and pressure supercritical carbon dioxide slow strain rate test system |
| CN107917872A (en) * | 2017-12-01 | 2018-04-17 | 西安交通大学 | Supercritical carbon dioxide corrosion experimental device and method under a kind of stress effect |
| CN108132211A (en) * | 2018-02-24 | 2018-06-08 | 华能国际电力股份有限公司 | A kind of supercritical carbon dioxide corrosion testing apparatus and application method |
| CN109596510A (en) * | 2019-01-07 | 2019-04-09 | 武汉钢铁有限公司 | The detection method of pipe line steel corrosive nature under supercritical carbon dioxide |
| CN110527943B (en) * | 2019-08-06 | 2021-01-19 | 西安交通大学 | Device and method for performing anti-corrosion treatment on magnesium and magnesium alloy by using supercritical carbon dioxide |
| CN112326484A (en) * | 2020-09-28 | 2021-02-05 | 山东大学 | Supercritical carbon dioxide dynamic rock erosion test system and working method thereof |
| CN112730129B (en) * | 2020-12-21 | 2022-05-20 | 山东大学 | Accelerated test method for dynamic rock erosion of supercritical carbon dioxide |
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| CN102519863B (en) * | 2011-12-15 | 2013-07-24 | 上海发电设备成套设计研究院 | Supercritical steam oxidization test device |
| CN102680384B (en) * | 2012-05-18 | 2014-12-17 | 西南石油大学 | High-temperature and high-pressure flowing device for evaluating corrosion resistance performance of materials |
| CN103543096B (en) * | 2013-10-30 | 2016-07-06 | 西安热工研究院有限公司 | A kind of dynamic high temperature high-pressure oxidation experimental provision |
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Non-Patent Citations (1)
| Title |
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| Performance Characteristics of an Operating Supercritical CO2 Brayton Cycle;Conboy T M, et al;《Journal of Engineering for Gas Turbines and Power-transactions of The Asme》;20121130;第1-13页 * |
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