Parallel flow fractionation tray

The invention is located at the afloat multi-downcomer tray of column (100) for multiple configuration's downcomers (20); the downstream multi-downcomer tray of column (100) is used for carrying to a chemical the compound or using liquid's some component the steam outlet and program of the through fractionating sand processing for and gas. With an implementation example, the side downcomer (104) is merged of the afloat multi-downcomer tray of column (100). The other implementation example, the downcomer (202) and side of the inclined surface (220); the side the draught liquid the downcomer the upright plate (206) is. The side of the inclined surface (220) is further provided with the volume of the body downcomer's inlet, a reducing the pipeline collecting; it does not requirement the simple tray (114).