【摘要】 提出了在炼焦过程中利用含锌粉尘作为焦煤添加剂,从而实现高温焦炉煤气脱硫的设想.热力学模拟计算和实验表明,在炼焦前期,含锌粉尘是非常有效的缚硫剂. 而在炼焦后期,在炼焦室中锌呈气态从半焦中进入焦炉煤气,在焦炉煤气离开炼焦室后,气态锌与硫化氢反应生成固态硫化锌. 脱硫产物自动从焦炉煤气中分离出来,从而实现了焦炉煤气的脱硫. 锌在焦炭中残留极少;氧化铁的存在有助于炼焦后期半焦中锌的挥发;含锌粉尘对焦炭质量的影响很小.更多还原

【Abstract】 Desulfurization of high temperature coke oven gas (COG) by mixing zinc-bearing dust into coking coal has been studied. For simplicity, a mixture of pure powered iron oxide and zinc oxide were used in the experiment to simulate the dust. Thermodynamic calculation and desulfurization experimental results show that in the plastic stage when metaphase is formed, the zinc-bearing dust additive could suppress the evolution of H2S into COG efficiently and in the subsequent contraction stage when coke is formed, zinc sulfide is decomposed to elemental zinc vapor and H2S because of high H2 atmosphere in COG. The elemental zinc vapor reacts homogeneously with H2S to form solid ZnS as COG leaves the carbonization room. Thus the concentration of H2S in COG does not increase and little zinc is left in the coke. Experimental results also disclose that iron oxide in the additive has the effect to retard the release of sulfur into COG and promote zinc to evolve from coke as zinc vapor in the contraction stage.更多还原