Abstract:

Based on chemical looping combustion, a system for hydrogen production from sorption-enhanced coke-oven gas steam reforming is presented.The system includes three reactors, namely sorption-enhanced coke-oven gas steam reforming reactor (SECOGSR), fuel reactor and air reactor.The system realizes direct production of high-purity hydrogen (93.23%) with inherent CO₂ capture.Aspen Plus was used to simulate the sorption-enhanced coke-oven gas steam reforming process and the whole system.The optimized operating conditions, such as temperature, pressure, calcium to carbon ratio, and steam to carbon ratio of the SECOGSR were 650℃, 1.5 MPa, 1 and 4, respectively.In order to achieve the heat balance of the whole system with no additional heat supply, 1 mol input of coke-oven gas of SECOGSR consumed 0.139 mol coke-oven gas, 0.648 mol air in the fuel reactor and 3.11 mol oxygen carrier in the air reactor, which was composed of NiO, Y₂O₃ and ZrO₂ with the ratio of 0.73/0.022/0.248 (mol).1 mol coke-oven gas generates 1.30 mol hydrogen and 0.355 mol pure CO₂ without additional separation process in the system.

Key words:

化学链燃烧, 焦炉煤气, 直接制氢, CO₂捕集, Aspen Plus

摘要：

建立了基于化学链燃烧供能的吸收剂引导的焦炉煤气水蒸气重整制氢系统，该系统包含吸收剂引导的焦炉煤气重整反应器（SECOGSR）、燃料反应器和空气反应器。该系统能产生高纯H₂［93.23%（mol）］，仅通过冷凝即可实现CO₂的捕获，分离能耗低。采用Aspen Plus软件对吸收剂引导的焦炉煤气重整制氢过程进行了模拟，得到优化的反应条件为：温度650℃，压力1.5 MPa，Ca/C=1，H₂O/C=4。并对系统进行了模拟，以NiO/Y₂O₃/ZrO₂(0.73/0.022/0.248，摩尔比）为化学链燃烧的载氧体和载能体，在满足反应器自热平衡和系统吸放热平衡的基础上，重整1mol焦炉煤气，燃料反应器和空气反应器所需的焦炉煤气、空气及载氧体NiO/Y₂O₃/ZrO₂的量分别为0.139、0.648、3.11 mol。该系统消耗1 mol焦炉煤气的产H₂量为1.30 mol，捕获的CO₂的量为0.355 mol。

关键词:

化学链燃烧, 焦炉煤气, 直接制氢, CO₂捕集, Aspen Plus