Purification and upgrading biogas from anaerobic digestion using chemical asborption of CO₂ with amines in order to produce biomethane as biofuel for vehicles: a pilot-scale study

Methane from biogas is a promising option for the transition to a circular economic system based on renewable and sustainable energy. Currently, there is a wide variety of technologies capable of efficiently extracting the impurities contained in biogas in order to produce biomethane. In the present study, work was carried out in a pilot plant for cleaning and upgrading real biogas from anaerobic digestion by means of the chemical absorption method. In contrast to other technologies, chemical absorption stands out for having the lowest CH₄ losses, which was crucial for this study. The objective was to purify and upgrade the biogas from anaerobic digestion of a WWTP to achieve a high concentration of methane and use it as biofuel in vehicles. The two aqueous solutions used as absorbents were mono-ethanolamine (MEA) and <i>N</i>-methyldiethanolamine (MDEA), both at 20% and 40% concentrations. It was found that the most effective solution was the MEA at 20% concentration, since it has the highest CO₂ removal efficiency (94%) and, therefore, CH₄ richness (96%). Finally, for every 100 m³ of biomethane generated after the chemical absorption process, 62 Nm³ of biofuel were obtained.

以可再生及可持续能源为核心的循环经济体系转型进程中，沼气甲烷是极具应用前景的备选方案。当前已有多种技术可高效脱除沼气中的杂质以制备生物甲烷。本研究依托一套中试装置，采用化学吸收法对厌氧消化产生的实际沼气进行净化提质。相较于其他技术，化学吸收法的甲烷（CH₄）损失率最低，这一点对本研究而言至关重要。本研究的目标为净化提质某污水处理厂（Wastewater Treatment Plant，WWTP）厌氧消化产生的沼气，使其甲烷浓度达标并用作车用生物燃料。本次实验选用的两种吸收剂水溶液分别为单乙醇胺（mono-ethanolamine，MEA）与N-甲基二乙醇胺（N-methyldiethanolamine，MDEA），浓度均设置为20%与40%。研究结果表明，20%浓度的单乙醇胺溶液脱除效果最佳，其二氧化碳（CO₂）脱除率可达94%，对应的甲烷纯度可达96%。最终，经化学吸收法处理后，每制备100立方米生物甲烷，可获得62标准立方米（Nm³）的车用生物燃料。

搜集汇总

背景与挑战

背景概述

该数据集总结了一项试点规模研究，通过化学吸收法使用MEA和MDEA胺类溶液提纯厌氧消化产生的沼气，以生产车用生物甲烷。研究发现20%浓度的MEA溶液最有效，可实现94%的CO2去除效率和96%的甲烷纯度，每100立方米生物甲烷可产出62标准立方米生物燃料。数据集包括补充材料，发布于2022年，涵盖生物物理、环境科学等多个分类。