两种不同再生方式下含碳能源直接制氢的比较

为了确定CO2吸收剂的不同再生方式对整个制氢过程的影响,根据含碳能源直接制氢的基本思路,构建了2种不同的制氢系统:碳部分转化(PCC)再生供热和化学链(氧化镍NO)反应供热。利用ASPENPlus软件,对2种不同再生方式下制氢系统的能量平衡和热平衡进行了热力学计算,分析系统的冷煤气效率,并对2种不同的再生方式对制氢过程中气体产物和固体产物组成的影响进行了初步分析。结果表明,相同的进料条件下,PCC过程中约68%的碳在气化炉中被气化时,系统可实现热平衡,此时冷煤气效率达0.74,而NO过程中只有51%的碳用于气化生成氢气,系统冷煤气效率只有0.67。即在该文的分析条件下,PCC过程更适合于为含碳能源直接制氢系统中的吸收剂再生供热。

Comparative Analysis of Hydrogen Production From Carbonaceous Energy Based on Two Different Absorbent Regeneration Modes

In order to determine the effects of different absorbent regeneration modes on the process of hydrogen production, and based on the idea of directly-producing hydrogen from carbonaceous energy, two modes are suggested in this paper. One case is partial carbon conversion(PCC), and the remaining serves as a fuel for the regenerator, and the other is chemical reaction(nickel oxidation(NO))in the regenerator to supply heat for absorbent regeneration. ASPEN Plus was used to make thermodynamic calculation, and the mass and energy balances as well as cold gas efficiency were analyzed for two different processes. In the same feed condition, about 68% carbon was gasified in the gasification reactor and heat balances was achieved in the PCC process, and gives a higher cold gas efficiency of 0.74.While only 51% carbon was gasified in the NO process, and has a lower cold gas efficiency of 0.67.So in the operating condition of this paper, the PCC process is more feasible to the absorbent regeneration in the system of hydrogen production from carbonaceous energy.