Automatic purification device and purification method in operational process of supercritical carbon dioxide system

Abstract

The invention discloses an automatic purification device and a purification method in the operational process of a supercritical carbon dioxide system. The automatic purification device comprises a high-capacity gas storage tank, a gas storage tank gas inlet pipe, a gas storage tank gas outlet pipe, valves for a tank body and a purification cavity, the purification cavity, a purification cavity exhaust valve, an impurity gas exhaust outlet and a carbon dioxide percentage concentration detection instrument. Due to the fact that the density of impurity gas at the same pressure and temperature is lower than that of carbon dioxide in the supercritical carbon dioxide circulation system, the purification cavity is arranged on the top of the high-cavity gas storage tank, under automatic control of a gas percentage concentration detection instrument and a control system, the impurity gas is gradually separated from the circulation system through opening and closing of the vales on two sides of the purification cavity, and the increase for the purity of a working medium inside the supercritical carbon dioxide system is realized. According to the method, the number of times for emptying by adopting carbon dioxide when the system is constructed and the system is started every time can be reduced, and the loss of the carbon dioxide working medium is reduced, so that the purity of carbon diode inside the supercritical carbon dioxide system reaches the requirement of design operation.

Description

technical field [0001] The invention relates to a purification device and a purification method during the operation of a high-purity high-pressure dense medium system, in particular to an automatic purification device and a purification method during the operation of a supercritical carbon dioxide system. Background technique [0002] The supercritical carbon dioxide power generation cycle system requires that when the system is in normal operation, the percentage concentration of carbon dioxide in the system is greater than 99%. Therefore, during the construction and each start-up of the supercritical carbon dioxide power generation cycle Heaters, multiple auxiliary tanks and other equipment need to be evacuated multiple times with carbon dioxide gas, especially in turbines, compressors and tank equipment. The percentage concentration is increased to the value required by the circulation system design. If the impurity gas can be gradually separated during the operation of...

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Problems solved by technology

If the impurity gas can be gradually separated during the operation of the supercritical carbon dioxide power generation cycle system, and the percentage concentration of carbon dioxide can be increased to the value required by the cycle system design, the above problems can be solved. However, there is no effective technology to solve this problem.

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