Separation and purification system for preparing industrial liquid carbon dioxide from gas field carbon dioxide

The invention discloses a separation and purification system for preparing industrial liquid carbon dioxide from gas field carbon dioxide. The separation and purification system is mainly composed of a wellhead separation unit (1), a reboiling distillation unit (2), a condensation liquefaction unit (3), an adsorption regeneration unit (4), a high-pressure stripping unit (5) and a storage pressurization unit (6). A gas and liquid outlet of the wellhead separation unit (1) is connected with a distillation reboiler (21) through a pipeline, a gas phase outlet of the distillation reboiler (21), a distillation tower (22), a gas phase inlet of an adsorption tower (41), a lower gas phase outlet of the adsorption tower (41), a middle gas phase inlet of a carbon dioxide condenser (51), a gas phase outlet of the carbon dioxide condenser (51) and a liquid phase inlet of a high-pressure stripping tower (52) are sequentially connected end to end through pipelines, and a lower liquid phase outlet of the high-pressure stripp