Supergravity waste gas treatment device, waste gas treatment circulating system and desulphurization and dust removal method

The invention provides a supergravity waste gas treatment device, a waste gas treatment circulating system and a desulphurization and dust removal method, and belongs to the field of flue gas purification. The supergravity waste gas treatment device comprises an alkali liquor spray device, an alkali liquor delivery pipe used for alkali liquor input and a waste gas pipe used for waste gas input; the alkali liquor spray device comprises a center pipe and multiple spray through holes, the center pipe is connected with the alkali liquor delivery pipe, and the spray through holes are formed in the outer wall of the center pipe; a waste gas pipe outlet and the center pipe are coaxial. Waste gas coming out of the waste gas pipe is subjected to first dust removal and desulphurization directly through an atomization area formed by the alkali liquor spray device, and the very high efficiency is achieved. The waste gas treatment circulating system comprises the supergravity waste gas treatment device and an alkali liquo