Al-Qadri Ali A, Ahmed Usama, Abdul Jameel Abdul Gani, Zahid Umer, Ahmad Nabeel, Shahbaz Muhammad, Nemitallah Medhat A
Department of Chemical Engineering, King Fahd University of Petroleum and Minerals, Dhahran31261, Saudi Arabia.
Interdisciplinary Research Center for Hydrogen and Energy Storage, King Fahd University of Petroleum & Minerals, Dhahran31261, Saudi Arabia.
ACS Omega. 2022 Dec 14;7(51):48075-48086. doi: 10.1021/acsomega.2c06036. eCollection 2022 Dec 27.
The worldwide demand for energy is increasing significantly, and the landfill disposal of waste tires and their stockpiles contributes to huge environmental impacts. Thermochemical recycling of waste tires to produce energy and fuels is an attractive option for reducing waste with the added benefit of meeting energy needs. Hydrogen is a clean fuel that could be produced via the gasification of waste tires followed by syngas processing. In this study, two process models were developed to evaluate the hydrogen production potential from waste tires. Case 1 involves three main processes: the steam gasification of waste tires, water gas shift, and acid gas removal to produce hydrogen. On the other hand, case 2 represents the integration of the waste tire gasification system with the natural gas reforming unit, where the energy from the gasifier-derived syngas can provide sufficient heat to the steam methane reforming (SMR) unit. Both models were also analyzed in terms of syngas compositions, H production rate, H purity, overall process efficiency, CO emissions, and H production cost. The results revealed that case 2 produced syngas with a 55% higher heating value, 28% higher H production, 7% higher H purity, and 26% lower CO emissions as compared to case 1. The results showed that case 2 offers 10.4% higher process efficiency and 28.5% lower H production costs as compared to case 1. Additionally, the second case has 26% lower CO-specific emissions than the first, which significantly enhances the process performance in terms of environmental aspects. Overall, the case 2 design has been found to be more efficient and cost-effective compared to the base case design.
全球对能源的需求正在显著增加，废旧轮胎的填埋处理及其库存对环境造成了巨大影响。通过热化学回收废旧轮胎来生产能源和燃料是一种颇具吸引力的选择，既能减少废弃物，又能满足能源需求。氢气是一种清洁燃料，可以通过废旧轮胎的气化然后进行合成气处理来生产。在本研究中，开发了两个过程模型来评估废旧轮胎的制氢潜力。案例1涉及三个主要过程：废旧轮胎的蒸汽气化、水煤气变换和酸性气体去除以生产氢气。另一方面，案例2代表了废旧轮胎气化系统与天然气重整单元的整合，其中来自气化炉衍生合成气的能量可以为蒸汽甲烷重整（SMR）单元提供足够的热量。还对两个模型的合成气组成、氢气产率、氢气纯度、整体过程效率、一氧化碳排放和氢气生产成本进行了分析。结果表明，与案例1相比，案例2生产的合成气热值高55%，氢气产量高28%，氢气纯度高7%，一氧化碳排放低26%。结果显示，与案例1相比，案例2的过程效率高10.4%，氢气生产成本低28.5%。此外，第二种情况的一氧化碳特定排放量比第一种情况低26%，这在环境方面显著提高了过程性能。总体而言，与基础案例设计相比，案例2的设计已被证明更高效且更具成本效益。
