Flue gas treatment device and treatment method

The embodiment of the invention relates to the technical field of waste gas treatment, in particular to a flue gas treatment device and method.The treatment device comprises a treatment barrel body, and the treatment barrel body is provided with a gas inlet, a drain outlet and an exhaust port; a dust removal cooling section for capturing particles and cooling, a reaction section for washing harmful gas and a protection section for removing crystalline salt and liquid drops are distributed in the treatment cylinder main body along the gravity direction and are communicated in sequence, the gas inlet is formed in the dust removal cooling section, the sewage draining exit is formed in the bottom of the dust removal cooling section, and the exhaust port is formed in the protection section. Different components are treated through the multiple sections of treatment parts respectively, the flue gas treatment effect is effectively improved, meanwhile, downward flushing and sedimentation are conducted through multipl