摘要
Abstract
Biogas is an important renewable energy source,and the full use of biogas is of great significance to alleviate energy demand and environmental pressure. Biogas must be purified by decarbonization before high value utilization. A new technology——hydrate-based separation technology,for the biogas purification is introduced. The basic theories of hydrate-based separation technology were introduced,and the research progress of hydrate-based separation technology biogas (CH4/CO2)was summarized,including phase equilibrium research,thermodynamic promotors,kinetic promotors,mechanical strengthening,field strengthening,adding porous media/nano-fluids,and using oil/water emulsion. Various technologies of hydrate-based separation were analyzed. Phase equilibrium study provided the theoretical basis for the purification of biogas by hydrate method. Reasonable selection of thermodynamic and kinetic promoters could effectively improve gas hydrate phase equilibrium conditions,promote hydrate formation,increase gas storage effect and improve separation efficiency. Mechanical strengthening and field action promoted hydrate formation by enhancing the mass and heat transfer effect in the hydration process. Adding porous media/nano-fluids could increase the gas-liquid contact area and promote the hydration process. The use of oil/water emulsion not only strengthened the gas-liquid contact,but also improved the fluidity of the hydrate in the microemulsion state with a good industrial application prospects. Finally,the application of hydrate-based biogas purification technology was proposed. The hydrate purification biogas research is still in the early stage. This technology has the advantages of mild operation conditions,low requirement for raw biogas, simple and flexible operation,high safety,and environmental protection without pollution. It will certainly play an important role in the development of biogas industry in China.关键词
水合物/沼气/分离/提纯/甲烷/二氧化碳Key words
hydrate/biogas/separation/purification/methane/carbon dioxide分类
化学化工
