(512c) Techno-Economic Assessment of Power-to-Gas Concept with Integrated Gasification and Dry-Reforming Process

Syngas is an important intermediate feedstock to produce various downstream chemicals and clean fuels. Some of the commercial routes for syngas production involves the gasification, reforming or partial oxidation of hydrocarbon based fuels. In this study, two standalone process models are first developed to produce syngas from coal gasification and natural gas dry reforming which provide the results for benchmarking the conceptual design. Two process models are then developed by integrating the gasification and dry-reforming models in the parallel and series configuration to improve the process performance. All the models are developed in Aspen Plus for producing the syngas at the rate of 10,000 kmol/h with a H₂ to CO ratio of 2. The heat integration is also developed in a way to utilize the heat energy from the coal-derived syngas into the dry-reformer without any energy penalties. The performance of the proposed designs is compared to the standalone processes in terms of the energy, emissions and economics. The results show that by combining the synergies of the two technologies not only reduce the emissions but also offers a lower cost compared to the standalone processes. The proposed parallel integrated design reduces the CO₂ emission by 53.5% compared to the standalone gasification unit, and the total annual costs by 16% compared to the standalone dry reforming unit, respectively. The proposed integrated designs can enable the utilization of fossil fuels in an environment friendly, technically feasible and an economical way.