Flue gas purification system

The utility model relates to the technical field of flue tail gas purification, in particular to a flue gas purification system. The SCR denitration device structurally comprises an SCR denitration reactor, a deacidification tower and a neutralization cooling tower which are sequentially connected through pipelines, one side of the SCR denitration reactor is connected with an inlet flue through a pipeline, the other side of the SCR denitration reactor is connected with the deacidification tower, the neutralization cooling tower and a compressor through pipelines, a heat exchanger is arranged between the inlet flue and the SCR denitration reactor, and the compressor is connected with the deacidification tower through a pipeline. The SCR denitration reactor is further connected with an electric heater, and a gas-water separator is arranged on a pipeline between the neutralization cooling tower and the compressor. According to the flue gas purification system disclosed by the utility model, the purified flue gas