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摘要减少CO2等温室气体的排放，保护人类生存环境安全是全球亟待解决的核心问题之一。利用碱金属基吸收剂干法脱除烟气中CO2的方法反应能耗低、吸收剂循环利用效率高、对设备无腐蚀、无二次污染等优点，得到了国内外研究者广泛关注。为提高钠基吸收剂吸收CO2的能力，本文利用溶胶凝胶法，分别用常规干燥法和超临界干燥法制备了多种表面氨基修饰的新型复合型钠基吸收剂并研究其脱碳特性。以TEOS为载体前驱物，APTES、DETA、TETA和PEI为氨基前驱物。氨基流失率和实际脱碳量结果表明，常规干燥法制得的TETA修饰的吸收剂脱碳量高；而超临界干燥法制得的APTES修饰的吸收剂脱碳量高。25340
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关键词 CO2 捕集 钠基吸收剂 氨基修饰 超临界干燥法 溶胶凝胶法
毕业论文设计说明书外文摘要
Title Study on Carbonation Characteristics of Sodium-Based Sorbents with Amino Modification for CO2 Capture
Abstract
Reducing the greenhouse gases’emissions and protecting the humanities’living environment are the key problems that people have to face. Dry alkali metal based sorbents technology for CO2 capture from flue gas has been attracted more attention due to that it is low energy consumption, high recycling efficiency and no corrosion or secondary pollution,.In order to improve the CO2 sorption performance of sodium-based sorbents, a series of sodium-based sorbents modified with amine were prepared by sol-gel method and then dried with conventional/supercritical fluid drying method and the corresponding amine loss ratio and CO2 sorption capacity were investigated. TEOS was chosen as the support precursor and Na2CO3 as the active ingredient and APTES, DETA, TETA and PEI as the amine precursor. Results showed that the sorbent modified with TETA had the highest CO2 sorption capacity if dried with conventional drying method, while the sorbent modified with APTES had the highest CO2 sorption capacity if dried with supercritical fluid drying method.
Keywords CO2 capture sodium-based sorbents amine modification supercritical fluid drying method sol-gel method
目 次
1 引言 1
1.1 研究背景与意义 1
1.2 CO2捕集与封存技术 1
1.2.1 CO2燃烧前捕集技术 2
1.2.3 钙基吸收剂循环煅烧/碳酸化捕集技术 3
1.2.4 燃烧后捕获技术 3
1.3 碱金属基固体吸收剂干法脱碳技术 4
1.4 碱金属基固体吸收剂脱碳的国内外进展 5
1.5本文研究目的和思路 7
2. 实验装置、方法及计算方法 9
2.1 溶胶凝胶法技术 9
2.1.1 溶胶凝胶法的技术发展和制备过程 9
2.1.2 溶胶凝胶法在本实验中的运用 10
2.2超临界干燥法 11
2.3 吸收剂制备及其表征 11
2.4吸收剂固定床测试 14
2.5 吸收剂理论吸收量的计算方法 16
2.5.1 N和Na含量 16
2.5.2 吸收剂理论吸收量计算方法 17
2.6 吸收剂实际吸收量计算方法及误差分析 17
3. 常规干燥法制得的不同氨基修饰的吸收剂脱碳特性 19
3.1 常规干燥复合型钠基吸收剂中N元素含量和Na元素含量 19
3.2 常规干燥复合型钠基吸收剂的的脱碳特性 20
4. 超临界干燥法制得的不同氨基修饰的吸收剂脱碳特性 21