Device for separating, circulating, cracking and converting biomass gasification tar

The invention discloses a device for separating, circulating, cracking and converting biomass gasification tar, which is characterized by comprising a vertical cylindrical furnace body, a gasification gas leading-out opening is arranged on the side wall of the upper portion of the furnace body and connected with a gradually expanding pipe through a gasification gas leading-out pipe arranged horizontally, a major diameter tail end pipe opening of the gradually expanding pipe is divided into an upper portion pipe and a lower portion pipe by a middle partition plate, the upper portion pipe is communicated with a venting vertical pipe, and the lower portion pipe is communicated with a circulating pipe. The circulating pipe is led into the furnace body from the lower portion of the furnace body, passes through a section of returning gas vertical pipe arranged at the center of the furnace body, is led out of the furnace body through a section of returning gas leading-out pipe located at theupper portion in the furnace body, and is communicated with the gasification gas leading-out pipe. A U-shaped tar recycling pipe is arranged at the bottom of the venting vertical pipe, a bottom tar outlet of the tar recycling pipe is connected with one end of a U-shaped liquid seal pipe, and the other end of the liquid seal pipe is connected with a tar cracking pipe which inclines downward and isled into the center of the furnace body. The device for separating, circulating, cracking and converting the biomass gasification tar achieves circulation and tar removing of the gasification gas, remarkably improves purification capacity to the gasification gas, and obtains cleaner produced gas.