焦煤中添加废塑料和脱硫剂的焦化过程研究

Under the simulated conditions of coking chamber, the coking process of coking coal blended with plastic and sulphur sorbent was investigated. The H2S removal efficiency of coking oven gas (COG) and the contents of residues of sulphur and zinc in the coke were also analyzed. The experimental results indicate that for the coking process of coking coal blended with ZnO, Fe2O3 or metallurgical dusts (MD), the removal efficiency of H2S in COG was satisfying when the molar ratio of sorbent (ZnO and/or Fe2O3) to the volatile sulfur in the mixture of coal and plastic (nZn+Fe/nS) is 1.2. The desulfurization activity of MD is relatively lower than that of ZnO and Fe2O3. Because of the thermal cracking behavior and chemical composition of plastic, the coke yield decreases from 81.5% for the coking-coal to 77.61% for the coking-coal with 5% of plastic added. However, if 5% of plastic and ZnO are added into the coking-coal, a satisfying removal effect of H2S in COG can be obtained when nZn+Fe/nS is increased to 1.7 due to the relative higher sulphur content in the plastic, while the contents of sulphur and zinc in the coke increase to some extent.