Abstract: 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.

Key words: raw coke oven gas, steam reforming, sorption enhancement, hydrogen production