Process for producing active carbon by cyclic utilization of high temperature flue gas

The invention relates to a process for producing active carbon by cyclic utilization of high temperature flue gas. The process comprises that: high temperature mixing gas of a thermal insulation gas cabinet is introduced into a pure oxygen burner arranged in a carbonization activation furnace; a carbonization reaction is performed by controlling a temperature; the generated high temperature steam, the generated carbon dioxide, and a downflow carbonization material are subjected to an activation reaction through a downstream gas distributor, and active carbon after the activation reaction enters a cooling chamber, and then is discharged; high temperature flue gas discharged from a carbonization chamber and an activation chamber enters the pure oxygen burner again to be burned; and the generated high temperature steam and the generated carbon dioxide are adopted as mixing activation gas, the mixing activation gas and the downflow carbonization material are subjected to the activation reaction through the downst