从CO2溶解度到碳捕获过程:热力学建模,电解质规格,相位行为,固化和再生能量在CO2 - NH3 - H2O系统中
Sang-Jun Han1, Seong-Yun Bae1, Min-Kyeong Oh1
1Department of Chemical Engineering, Chungbuk National University, Cheongju, Chungbuk 28644, Korea.
Environmental science & technology
|October 24, 2025
概括
为捕获二氧化碳优化水性氨 (NH3) 需要平衡固体降水风险和再生能量. 较低度减少固体,但增加能量;较高度减少循环,但在高二氧化碳负载下危险固体.
科学领域:
- 化学工程是化学工程的重要组成部分.
- 热力学是一种热力学.
- 碳捕获技术的技术
背景情况:
- 水性氨 (NH3) 是一个有前途的溶剂,用于燃烧后的二氧化碳捕获.
- 准确的热力学模型对于优化溶剂性能和工艺设计至关重要.
- 了解蒸汽-液体平衡 (VLE) 和盐沉是有效运行的关键.
研究的目的:
- 开发和验证二氧化碳捕获中的水性氨的热力学模型.
- 为了研究氨度对VLE和二碳酸 (NH4HCO3) 沉的影响.
- 分析再生能源需求,并确定最佳运行条件.
主要方法:
- 使用实验VLE数据,改进一个电解质非随机双液体 (e-NRTL) 模型.
- 实验性VLE数据收集NH3度为4-8重量%在40-80°C.
- 简化再生能量分析,考虑剥离器温度,压力和NH3度.
主要成果:
- 较低的NH3度 (<7重量%) 减轻了固体降水风险,但增加了再生能量.
- 较高的NH3度降低了循环速度,但在高二氧化碳负载下存在固体形成的风险.
- 为了最大限度地降低再炉功率 (2.90 GJ/tCO2),对10%重量%的NH3溶液的最佳条件被确定为~130°C和800kPa.
结论:
- 经过验证的热力学模型提供了对降低二氧化碳捕获成本的操作策略的见解.
- 氨度和温度控制是优化再生能量的主要因素.
- 平衡过程参数对于最大限度地降低运营成本和与固体沉相关的风险至关重要.
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