Compact integrated three-section structure flue gas white smoke elimination tower and white smoke removal method

The invention discloses a compact integrated three-section structure flue gas white smoke elimination tower and a white smoke elimination method. Comprising a condensation section, a spraying demisting section and a heating section which are integrally arranged in sequence from bottom to top. The heating section adopts a tubular MGGH heat exchange device, and the tubular MGGH heat exchange device comprises an MGGH flue gas cooler and an MGGH flue gas reheater; in the MGGH flue gas cooler, original high-temperature flue gas is used for heating heat medium water and cooling the flue gas at the same time; and heating the purified flue gas after the water spraying condenser by using the heated heat medium water in the MGGH flue gas reheater, and cooling the heat medium water at the same time. The three white smoke elimination technologies of condensation dehumidification, spraying demisting and temperature rise heat exchange are organically combined in one tower, the single tower has multiple functions of flow eq