废旧轮胎热解吸附强化重整制氢特性及经济性分析

To promote the efficient utilization of waste tires, a hydrogen production process involving pyrolysis, adsorption, and enhanced reforming of waste tires is proposed. Based on the principles of minimizing Gibbs free energy and maintaining energy and mass conservation, the proposed process flow employs CaO as the adsorbent to combine traditional reforming with in-situ CO2 adsorption. The thermodynamic performance of the process is analyzed by examining the effects of reforming reaction temperature, reaction pressure, steam-to-carbon ratio (ns/n(C)), and calcium-to-carbon ratio (n(Ca)/w(C)). Additionally, a techno-economic evaluation is conducted to assess the feasibility of the process. The research findings indicate that increasing the reforming temperature and nR/n(C) enhances hydrogen yield. However, the hydrogen production efficiency decreases as the reforming temperature and ns/w(C) increase. On the other hand, increasing the n(Ca)/n (C) ratio improves both hydrogen yield and production efficiency, although the improvement becomes less significant when «(Ca)/«(C) exceeds 1. Considering all factors, the optimal operating parameters are determined as follows: a reforming temperature of 650 °C, a reforming pressure of 1 MPa, an ns/n(C) ratio of 3. 5, and an n(Ca)/n(C) ratio of 1. Under these conditions, the hydrogen yield is 0. 203, and the hydrogen production efficiency reaches 57. 9%. Economic analysis reveals that the cost of hydrogen production from waste tires is approximately 10. 87 yuan/kg, with a payback period of 4 a. These results indicate significant economic benefits associated with the process. The research outcomes provide valuable insights for the high-value utilization of waste tires.