- 學位論文
煤吸附CO2實驗評估與應用
The experimental set-up and application for the CO2 adsorption behavior study of coal
摘要
溫室效應問題日漸嚴重，其中二氧化碳的排放為主要的原因之一，如何減少二氧化碳排放量已成為現今環境科學最重要的議題。其中一個有效的方法是將二氧化碳封存在地底煤層中，除可有效減低二氧化碳所造成的溫室效應，尚可增加煤層氣的採收（CO2－Enhanced coal bed methane, CO2－ECBM）。 由於煤對二氧化碳的吸附量是影響二氧化碳封存的關鍵因素，本研究的目的即針對煤層氣開採及二氧化碳封存問題建構一套煤吸附的實驗儀器，此套設備以溫度及壓力為考量，模擬地下煤層之溫度與壓力，置入煤樣進行二氧化碳氣體等溫吸/脫附試驗，試驗數據由Langmuir Isotherm model進行Langmuir Pressure及Langmuir Volume 參數之擬合。另進行台灣及澳洲煤礦之工業分析及成熟度分析，以探討煤礦對二氧化碳之等溫吸/脫附之行為。 根據等溫吸/脫附試驗結果，發現台灣新平溪煤礦在接近二氧化碳超臨界化之壓力（800 psi）時，其二氧化碳吸附氣量約為383 scf/ton，且氣體吸附與脫附行為相當一致。另由試驗結果計算吸/脫附氣量時發現，壓力與溫度為試驗相當敏感之因子。根據Langmuir Isotherm model分析結果，發現新平溪煤礦對二氧化碳等溫吸/脫附曲線之Langmuir Pressure為117.4 psi，Langmuir Volume為442.5scf/ton。最後將台灣及澳洲煤樣工業分析及鏡煤素反射率測量結果與吸附量比對，發現固定碳及灰份含量越高吸附量亦越高，且成熟度較高之煤樣其吸附量也有增加的趨勢。
並列摘要
Greenhouse gases (GHGs) are gas phase components of the atmosphere that contribute to the greenhouse gas effect, the trapping of radiant heat from the sun within the Earth’s atmosphere. One GHG of particular interest is carbon dioxide because it is one of the most prevalent of all GHGs.How to reduce the carbon dioxide withdrawal to become the environmental science most important subject nowadays. Injecting CO2 into unminable coal seams has been proposed as a method to permanently sequester anthropogenic CO2 emissions. Injecting CO2 has been proposed as a method to enhance the production of methane from coalbed methane (CBM) operations in a process called CO2-enhanced coal bed methane (CO2-ECBM). Therefore the gas storage capacity is the key aspect which to the CO2 sequestration in coal. This research's goal namely aims at CO2-enhanced coal bed methane and CO2 sequestration to construct a set the experiment instrument of coal adsorption.The set of equipment take the temperature and the pressure as the consideration, simulation the temperature and the pressure underground coal bed, posts the coal sample to measure Sorption Isotherm with CO2 gas. The tentative data carries on Langmuir Pressure and Langmuir Volume by fitting of the parameter with Langmuir Isotherm model. In addition carries of Proximate analysis and the maturity analysis on Taiwan and the Australian coal , in order to discuss the behavior of Sorption Isotherm with CO2 gas of coal. According to the result of soprtion experiment, find that Taiwan Sinping brook coal close carbon dioxide supercritical pressure (800 psi), its carbon dioxide gas storage capacity is 383 scf/ton, and the gas adsorption is quite consistent with the gas desorption. The pressure and the temperature for experimental are quite sensitive factor. According to the result of Langmuir Isotherm model analysis, discovered that the Sinping brook coal mine’s Langmuir Pressure is 117.4 psi, Langmuir Volume is 442.5 scf/ton. Finally compare the sorption capacity with Proximate analysis and Reflectance of Vitrinite measurement result on Taiwan and Australian coal, discovered that fixed carbon and ash content higher adsorptive capacity is also higher, and high maturity coal sample its sorption capacity also has the increase tendency.