Low-cost and pollution-less biomass liquefying process and equipment

[0013] Further description will be made below in conjunction with the embodiments and accompanying drawings.

[0014] Gasifier 1 adopts the existing fixed bed downdraft type, with a rated gas production of 400m 3 /hr, the temperature of the outlet gas can be adjusted by changing the air volume of the most downstream fan (550°C in this example). The high-temperature anaerobic combustible biogas from the outlet of the gasifier is directly introduced into the bottom of the liquefier 4 (the feeding rate is about 400kg/hr according to the rated gas production), and at the same time, the crushed biomass in the raw material cylinder 2 (using 0.8mm or so sawdust) is also sent into the bottom of the liquefier via the screw material conveyor 3 (the feeding rate is 150kg/hr). According to the feeding rate of the aforementioned pulverized biomass and biogas, it can be seen that the mass mixing ratio of the two is about 1:2.7. The liquefier is made of stainless steel and is in the shape of a cylinder with equal diameters. The inner wall is smooth. The inner diameter is 300mm and the height is 4m, which determines that the flow velocity of the gas-solid two-phase flow in the liquefier is about 4m/ s, the flow time is 1s. The gas-solid separator 5 adopts a cyclone separator (the specific size is determined by the gas flow rate), the spray head 7 is a commonly used spray head, the cooling water pipe 8 is a copper cooling coil, and the oil pump 9 has a flow rate of 4m 3 /hr gear pump, the material collector 12 is a steel rectangular structure (volume is 0.2m 3 ), the condenser 6 is a vertical single-stage condensation tower, the liquid outlet 11 is connected to the container for storing bio-oil, and the flow rate of the fan connected to the gas outlet 10 is 400m 3 /hr Roots blower. When the device works for the first time, 100 kg of industrial alcohol should be preset in the condenser to replace bio-oil.

[0015] Experiments show that the biomass liquefaction process and device provided by the present invention have a bio-oil yield of about 50wt%, a charcoal yield of about 20wt%, and an output cost that is only about half of the output income.