Supercritical carbon dioxide corrosion reaction system

Supercritical carbon dioxide corrosion reaction system

Supercritical carbon dioxide corrosion reaction systemIt is a special fluid with low viscosity, high diffusion coefficient, high density, and good solubility, and is therefore considered a preferred material for energy transfer in fourth generation nuclear reactors. Due to the extremely harsh working environment of nuclear reactors, the application of supercritical carbon dioxide in nuclear reactor systems can easily cause material corrosion. In order to ensure the safe and effective operation of nuclear reactors, a systematic study was conducted on the corrosion behavior of supercritical carbon dioxide. The influence of factors such as temperature, pressure, impurities, and flow rate on the corrosion behavior of materials in supercritical carbon dioxide was elucidated, and urgent problems were proposed for current research.

Supercritical carbon dioxide is a highly compressible non ideal gas cooling cycle that undergoes no phase change and undergoes mass reduction during compression. The supercritical carbon dioxide fluid exhibits both sexes, with high density, low viscosity, compression loss, improved cycle efficiency, low energy conversion, and good fluidity. It is often used in the petroleum industry for higher carbon replenishment efficiency. Therefore, supercritical carbon dioxide can replace water as the coolant for Carbon Capture and Storage (CCS) reactors. But supercritical carbon dioxide fluid is used during cooling and drilling processes. Nuclear energy, due to its high efficiency and safety, can corrode the cladding materials of nuclear reactors. In order to achieve nuclear reactor advantages, it has gradually become a research focus in the energy field at home and abroad. When it comes to the safe and effective operation of reactors, it is necessary to consider not only the radiation stability of cladding materials, but also the corrosion mechanism of supercritical carbon dioxide materials. It is also necessary to consider the issue of the cladding material being subjected to supercritical carbon dioxide corrosion. The supercritical carbon dioxide corrosion test system generally consists of a fluid. Carbon dioxide in nature often appears in a gaseous state, but when the temperature exceeds 31 ℃ and the pressure exceeds 73.8MPa, the liquid input system, fluid discharge system, high-pressure reactor reaction vessel, and condenser solid interface of gaseous carbon dioxide will disappear, and carbon dioxide will present both sexes as a fluid. Carbon dioxide is called supercritical carbon dioxide. At present, the experimental materials for supercritical carbon dioxide corrosion are characterized by high density, low viscosity, and strong flowability of metallic carbon dioxide, especially for ferritic martensitic alloys and austenitic alloys, which have better thermal effects than water. There is a lot of research on alloys and nickel based alloys during reactor cooling. Domestic and foreign scholars have shown that metal has better heat dissipation performance, which can reduce mechanical losses, prolong the long-term operation of mechanical materials in supercritical temperature and high-pressure corrosive media, and also withstand neutrons. They have compared the material research and application of different metal materials under supercritical carbon dioxide conditions.

The online testing system for electrochemical corrosion behavior of supercritical water system belongs to the field of electrochemical testing technology. The testing system introduces a reference electrode that is resistant to supercritical water conditions and a fastening combination working electrode, which can increase the operating temperature to supercritical water conditions. The main circuit for supercritical water generation is combined with a pressure resistant self sealing stirring device to achieve the acquisition and homogenization maintenance of the supercritical water testing system; The high-pressure gas dissolution control module can obtain the required test solution containing different gas types and concentrations, thus meeting the requirements of different testing conditions. The high-temperature and high-pressure reaction kettle is equipped with a supercritical water resistant reference electrode, a fastening combination working electrode, and a counter electrode, making the electrochemical testing module applicable to supercritical environments up to 500 ℃. Therefore, the system can meet the requirements of material electrochemical corrosion testing in various high-temperature and high-pressure water systems, including supercritical water.