High-quality utilization of raw coke oven gas for hydrogen production based on CO2 adsorption-enhanced reforming

To realize the high-quality utilization of raw coke oven gas (RCOG), the adsorption-enhanced steam reforming process was purposed for hydrogen production, coupled with the sensible heat recovery and the conversion of the high-energy components (such as tar). For this process, the hydrogen production performance and energy utilization efficiency were focused via reforming experiment and process simulation. Using the prepared bifunctional catalyst (Ni/Ce–CaO–Ca12Al14O33), the enhanced reforming experiment was conducted based on orthogonal design and Taguchi method. Compared to S/C ratio (the mole ratio of steam to carbon in the simulated RCOG) and WHSV (weight hourly space velocity), reforming temperature shows a higher sensitivity to hydrogen production. At 800 °C, the produced H2 amount can achieve 3.86 times of that in the initial RCOG and the H2 concentration in the produced gas can reach 88.38 %, when the S/C ratio was 15 and the WHSV was 0.0847 h−1. Based on the established process model, the energy consumption of RCOG enhanced reforming system was discussed. Compared to traditional hydrogen production technologies, this novel process exhibits a lower energy consumption, just about 62.5 MJ/kg H2, and also shows a higher energy conversion efficiency.