Separation and purification system and method for coal hydrogen conversion gas

The invention provides a separation and purification system and method for coal-to-hydrogen shift gas, and belongs to the technical field of low-carbon energy environmental protection. The system comprises a decarburization tower, a purification tower, a compressor, a cooler, a desulfurization tower, a gas-liquid separation tank, a slurry pump, a filter, a filtrate pump, a dehydration tower, a rectification tower, a condenser, a reboiler, a pretreatment unit and a membrane separator. According to the invention, decarburization, desulfurization, dehydration, separation and purification are carried out through the technical means of adsorption, catalysis, rectification and membrane separation, hydrogen, industrial grade carbon dioxide and sulfur meeting the hydrogenation process standard of an oil refinery are produced, the recovery rate of hydrogen and carbon dioxide is improved, greenhouse gases are reduced, the utilization efficiency of resources is integrally improved, and the production cost is reduced. Th