Taken the new high-efficiency flue gas circulating fluidized bed technology as core, Longking has integrated DPC pretreatment and ultra-clean fabric filter technology. For denitration, one or more combined processes can be applied such as low nitrogen combustion/COA/SNCR/SCR technology. A series of D-MEC solutions such as SSC/ASC/GSC/FSC can be provided for different fields to achieve multi-pollution treatment in flue gas and near-zero emission.