文档介绍：沼气脱氧工艺的研究
摘要
沼气中氧的存在使其在化工生产中具有安全隐患。同时沼气的不同加工过程也对氧含量有一定要求。目前对沼气脱氧的研究较少,而气体脱氧工艺及脱氧剂的研究已日趋成熟。本次研究主要参考气体脱氧研究的成果,结合沼气本身的性质对其进行脱氧实验。
实验采用甲烷催化燃烧的方式进行脱氧,所用气体为模拟沼气,所用催化剂为高活性的贵金属催化剂T-349催化剂(Pt-Pd/Al2O3催化剂)。以欧洲标准(O2<%)为目标,研究在不同温度、压力和空速条件下的脱氧效果。实验结果表明:温度升高,脱氧深度降低,副反应会加剧,最佳脱氧温度为350℃;压力升高,尾气含氧量增加,最佳脱氧压力为常压;空速升高,产品气中氧含量增加,最佳空速条件为1000h-1。但最终结果为350℃、0~~6000h-1时均可达到脱氧目标,工业应用中应结合实际要求选择合适的工艺条件。
关键词:沼气;脱氧剂;温度;压力;空速
The research of methane deoxidation process
Abstract
The presence of oxygen in methane causes security risks in the chemical industry. Meanwhile different processes of methane also have requirements for oxygen content. Currently the research of methane deoxidation is insufficient while the gas deoxidization and deoxidizer technology is increasingly matured. According to the research e of gas deoxidizing and the nature of the methane, we have a study on the deoxidizing of methane.
We use the bustion to remove the oxygen from methane, the methane gas is simulation of gas distribution; the catalyst is high activity of noble metal catalyst T-349(Pt-Pd/Al2O3). Taking the European standard (O2<%) as the goal we study the deoxidation effects with different temperature, pressure and space velocity. The results show that: when the temperature increases, the deoxidation es down, while the secondary reaction will increase, the best deoxidation temperature is 350℃; as the pressure increases, the content of exhaust gas oxygen increases, the best deoxidation pressure is atmospheric pressure; as the space velocity increases, the product gas oxygen content goes up, the best space velocity is 1000h- the final result is that we can achieve the target of deoxidation at 350℃, 0~ and 1000~6000h-1, we should select the appropriate process conditions according to industrial applications.
key words: Methane; Oxygen; Temperature; Pressure; Space velocity
目录
第1章前言 1
第2章文献综述 3
沼气的开发与应用 3
沼气的净化及脱氧 4
气体脱氧剂的研究现状 5
催化脱氧 6
吸收脱氧 6
燃烧