NOVELTY - Laminar flow condenser comprises a horizontal barrel body (1) with rectangular cross section. One end of the barrel body is provided with a pyrolysis gas inlet (2) and the other end is provided with pyrolysis gas outlet (3). The bottom of the barrel body is provided with a bio-oil outlet (4). Several parallel condensing plates (5) are mounted in the barrel body along the pyrolysis gas flow direction. An overflow groove is located at the top end of each condensing plate. The side wall of the overflow groove is symmetrical to the condensing plate.    USE - The laminar flow condenser is useful for pyrolysis and liquefaction of biomass.    ADVANTAGE - The device has low flow rate, thin air flow layer and large temperature gradient, thus it has high heat transfer efficiency, is simple, convenient to assemble and disassemble, and easy to clean, and has high working performance.    DETAILED DESCRIPTION - Laminar flow condenser comprises a horizontal barrel body (1) with rectangular cross section. One end of the barrel body is provided with a pyrolysis gas inlet (2) and the other end is provided with a pyrolysis gas outlet (3). The bottom of the barrel body is provided with a bio-oil outlet (4). Multiple parallel condensing plates (5) are mounted in the barrel body along the pyrolysis gas flow direction. An overflow groove is located at the top end of each condensing plate. The side wall of the overflow groove is symmetrical to the condensing plate. A horizontal distribution pipe mounted at the top end of the barrel body is connected to the bio-oil inlet. The distribution pipe is provided with a branch pipe corresponding to each overflow groove. The bottom outlet of the branch pipe is inserted in the overflow groove. The pyrolysis gas outlet in the barrel body is provided with a screen.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic representation of the laminar flow condenser for biomass pyrolysis liquefaction.    Horizontal barrel body (1)    Pyrolysis gas inlet (2)    Pyrolysis gas outlet (3)    Bio-oil outlet (4)    Parallel condensing plates (5)