吸附强化焦炉荒煤气重整制氢的热力学分析

采用Aspen Plus软件对焦炉荒煤气重整制氢反应进行热力学分析.研究发现，普通重整(不添加CO₂吸附剂)和吸附强化重整(添加CO₂吸附剂CaO)最佳反应压强都为常压，温度和n_○S/n_○C(蒸汽与C物质的量比)的增加能促使H₂的产量和体积分数(干产气体积分数)增加，但n_○S/n_○C大于3以后增幅不大.CaO的添加会促进重整反应进程，降低最佳重整温度，提升H₂产量和浓度.当n_○S/n_○C=3时，吸附强化重整(n_○CaO/n_○C(CaO与C物质的量比)=1)的最佳反应温度由普通重整的650℃降为450℃，而每100mol焦炉荒煤气产氢量由186mol提升为212mol，氢气体积分数由74%提升为97%，而制氢能耗则由2.26kW·h/m³降为2.00kW·h/m³.

Thermodynamic Analysis of Producing Hydrogen by Sorption Enhanced Steam Reforming Process of Raw Coke Oven Gas

Thermodynamic analysis of producing hydrogen by the steam reforming process of raw coke oven gas(RCOG)was carried out using Aspen Plus software．It was found that the normal pressure was the best pressure for hydrogen-producing reaction by the steam reforming of RCOG without CO₂ sorbent(i.e.， ordinary reforming)and with CO₂ sorbent of CaO(i.e.， sorption-enhanced reforming). With increasing temperature and the ratio of steam to carbon(n_○S/n_○C)， the amount and concentration of H₂ increased， while they changed slightly after n_○S/n_○C was over 3. The addition of CaO enhanced the reforming reaction process， resulting in the decrease of the best reaction temperature and the increase of the amount and concentration of H₂. Compared with those by ordinary reforming， the best temperature for the reaction by sorption-enhanced reforming with n_○CaO/n_○C=1 dropped from 650℃ to 450℃， the amount of H₂ increased from 186 mol to 212mol per 100mol RCOG， the volume fraction of H₂ increased from 74% to 97%， and the energy consumption of producing hydrogen decreased from 2.26kW·h/m³ to 2.00kW·h/m³， when n_○S/n_○C=3.