Oil injection control method for high-pressure supercritical carbon dioxide reciprocating compressor

The invention discloses an oil injection control method for a high-pressure supercritical carbon dioxide reciprocating compressor. The method comprises the following steps: performing component analysis on a compressor gas sample, and recording the concentration of each gas component in carbon dioxide mixed gas; calculating a carbon dioxide critical point under the current carbon dioxide concentration according to the concentration of each gas component; according to the calculated carbon dioxide critical point and air cylinder data of the compressor, the current phase state of carbon dioxide in an air cylinder of the compressor is judged and regulated; calculating the intersolubility coefficient of the supercritical carbon dioxide and the lubricating oil according to the calculated critical point of the carbon dioxide, the cylinder data of the compressor and the static pressure of the current lubricating oil; according to the intersolubility coefficient, the current intersolubility state of the lubricating o