A new design for CO2 capture and usage in a syngas production unit by carbonate chemical looping

作者：Ebrahimi Hadi; Rahmani Mohammad^*

来源：Journal of Natural Gas Science and Engineering, 2016, 36: 241-251.

DOI：10.1016/j.jngse.2016.10.007

• Synthesis gas
• CO2 capture
• Carbonate looping technology
• Elevated pressure

Synthesis gas, a mixture of H-2 and CO, is conventionally produced by steam methane reforming (SMR) process. Different H-2/CO ratios are required in industrial applications for producing of methanol, and liquid hydrocarbons by Fischer-Tropsch synthesis. Addition of CO2 to the feed of a SMR reduces this ratio. In this process CO2 is conventionally separated from reformed syngas or flue gases by high cost amine based sorbents leading to environment pollution. Carbonate chemical looping as a novel CO2 capture process in which carbon dioxide could be separated and reserved, not only reduces a part of greenhouse gases but also supplies the required CO2 for the existing synthesis gas plants. In the present work, an existing industrial syngas production unit with H-2/CO of one is analyzed and coupled with a new CO2 capture design employing carbonate chemical looping technique. The CO2 is separated from the flue gas of industrial furnace of an SMR unit. In the new integrated configuration, necessary equipment such as pumps, compressors and exchangers, as well as an additional furnace for supplying the heat of the calciner reactor are installed. Simulation results show that both steam and CO2 required for the reformer could be supplied from the carbonate looping process to produce a H-2/CO of 1. Effect of pressure was analyzed on the proposed integrated process. The results show that a 100% increase in pressure (10 20 bar) results in a 7% increase in fuel consumption rate. The results also show that almost all parameters such as fuel, CaO circulation rate, the excess steam and power are increased linearly by increasing the capacity of the plant.

• 出版日期2016-11