| Thus far, global warming and pollution are still seriously issues. Therefore,controlling the emission of CO2and developing the green energy technology are neededurgently. It’s a crucial task to make full use of coke oven gas due to our country treatingthe coal as a main energy source. More and more researchers devote the attentions to thecoke oven gas because of which contains lots of combustion gas and more than50%hydrogen and the feature of hydrogen, i.e. renewable, efficient and environmentalfriendly etc.. Hence, reforming hydrogen production from coke oven gas is recognizedby researchers. In addition to, the chemical looping combustion is an efficient andenvironmental friendly emerging technology, and it can afford the energy needed for thereforming hydrogen produced from coke oven gas by combusting partial coke oven gas.Besides, the chemical looping combustion separates and purify the CO2coming fromthe products of combustion. Accordingly, it is a great advantage to utilize reforminghydrogen producted from coke oven gas by coupling with chemical loopingcombustion.Based on elucidated above, in the current paper, a system of reforming hydrogenproducted from coke oven gas by coupling with chemical looping combustion has beendeveloped, for which the raw material is the coke oven gas, the oxygen carrier is Fe2O3and the absorbent of CO2is CaO. The system are compose of two parts, i.e, thechemical looping combustion affording the energy by combusting partial coke oven gasneeded for the reforming hydrogen produced from coke oven gas and the system ofreforming hydrogen. Aspen Plus is adopted to simulate and analyse the system, and withthe assumption that all of the reforming-reactor，fuel-reactor and air-reactor havealready been the thermodynamic equilibrium. The components of the equalized gas arecalculated in the Rgibbs module based upon the principle of Gibbs free energyminimization, and the reuslts reveal that the appropriate higher pressure, temperatureand the ratio of water and carbon of the reforming reaction are beneficial to increase thepurity of hydrogen. What’s more, the fuel and oxygen carrier can be made full use ofwhen the Fe3O4is dominant in the reduzates of oxygen carrier.In current system, the optimal conditions for every ractor are obtained according tothe analysis of thermodynamics, i.e, the temperation, pressure and the ratio of water and carbon, calcium and carben of the reforming-reactor are650°C,1.5Mpa,4.5and0.8respectively. Similarly, the temperation, pressure and the ratio of iron and carbon of thefuel-reactor are900°C,0.1Mpa and15separately and the temperation, pressure andminimum ratio of air and carbon are1200°C,0.1Mpa and12. In addition to,1mol cokeoven gas can produce1.53mol of hydrogen under the optimal condition, and the purityof hydrogen can be up to96.63%and the carbon capture rate is95%.Besides, the contrastive analysis of the systematic performance is also carried outunder the optimal condition, i.e. comparison of coupling and non coupling withchemical looping combustion by analysis of the systematic energy. The former canrecucle the energy with7.91%(309.99kJ) in the fuel-reactor. However, the latter willlose60.63kJ, which occupy up to17.69%of the total. With respect to adding CaO asthe CO2absorber, the purity of hydrogen can achieve93.87%, whereas, the purity ofhydrogen drop to69.63%as well as the production of hydrogen decease to0.59molwithout adding CaO, and the heat loss in reforming-reactor occupy16.07%and27.15%of the total respectively. Moreover, the high temperature water circularly used in thesystem can reduce lots of material consumption. By utilizing the high temperaturecircularly,0.54mol of water is needed in the reforming-reactor, which is in contrast to1.71mol water needed without water recycle. The former can reduce the materialconsumption by68.42%and the consumption of energy is merely104.52kJ which are6.16%less than the latter. |
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