Abstract
The adaptability of the gas heat carrier cross-flow pyrolysis process to Huolinhe lignite (0-80 mm) and the influence of the temperature of the heat carrier and moisture of the raw materials on the yield and properties of the pyrolysis products were studied using a 30 t/d cross-flow pyrolysis pilot plant with a gas heat carrier. When the temperature of the gas heat carrier was increased from 750 to 850 °C, the volatiles (V daf) produced from the char decreased from 16.81 to 10.57%, the yield of tar (Tar d) increased from 73.81 to 81.1% of the Gray-King (G-K) tar yield, and the yield of gas decreased from 1312 to 1205 Nm3/t. When the temperature of the gas heat carrier was constant at 850 °C and the moisture content (M t) of lignite was reduced from 12.49 to 7.14%, the V daf of char declined from 10.57 to 6.59%, the yield of gas was reduced from 1205 to 805 Nm3/t, the calorific value of gas increased from 3.88 to 4.68 MJ/m3, and the Tar d increased to 81.56% of the G-K tar yield. The light tar content (boiling point below 360 °C) was more than 60%, and the ash content was less than 0.04%. The cross-flow pyrolysis moving bed could effectively treat full-size lignite, afforded continuous and stable operation, and provided a high oil and gas yield, which provides basic data for further industrial design.