Route to No-flaring and No CO2 emission in the Gas Refinery

Each The mitigation and utilization of greenhouse gases, such as carbon dioxide and methane, are among the most important challenges in the area of energy research. In the gas refinery, tail gas in sulfur recovery unit is a main source of CO2 emission and the natural gas to flare is also a source of methane and CO2. In this paper, Dry Reforming- Fischer-Tropsch Synthesis-Catalytic Dehydrogenation (DRM-FTS-CDH) process isproposed to recover flare gas and tail gas in the gas refinery and calculation and simulation was done. Dry reforming of CH4 (DRM), which uses both CO2 and CH4 as reactants, is a potential method to utilize the greenhouse gases in the atmosphere. DRM offers several advantages: a) mitigation of CO2 and natural gas; b) transformation of natural gas and CO2 into valuable syngas; c) effective utilization of low-grade natural gas resources consisting of natural gas and CO2. Hydrogen in the product could be applied as a fuel in fuel cells and the syngas can be converted efficiently to ultraclean fuels, such as gasoline, gasoil with no sulfur and less aromatic byproducts, by Fischer–Tropsch synthesis (FTS). But with respect to nature of DRM process which results in a H2/CO ratio of less than unity while FTS of liquid fuels requires syngas with H2/CO≥2.0. By producing the required H2 by catalytic dehydrogenation (CDH) of the gaseous (C1–C4) products of FTS, instead of WGS reaction, it could be retrieved shortage of H2/CO ratio. In this research basic supports such as alumina, Fe-Mn-K catalyst and carbon nanotubes selected for DRM-FTSCDH, respectively. This new process is a suitable alternative to conventional gas flaring which prevents harmful environmental effects through emission of significant amounts of carbon dioxide in the atmosphere.

Keywords:

gases Reforming , Fischer-Tropsch Synthesis , CO2 emission