【Applied Energy最新原创论文】面向直接空气捕集的太阳能辅助变温真空吸附系统对于不同相对湿度影响规律的研究

AEii国际应用能源 · 公众号 · · 2023-08-25 18:30

正文

原文信息：

Solar-assisted temperature vacuum swing adsorption for direct air capture: effect of relative humidity

原文链接：

https://www.sciencedirect.com/science/article/abs/pii/S0306261923008577

Highlights

1)创新性提出结合冷凝热回收的太阳能辅助直接空气捕集系统。

2)研究了水对系统技术经济性能的影响。

3)基于系统技术经济性评估存在最佳相对湿度值。

4)所提出系统面向实际应用的技术经济潜力已经被证明。

摘要

直接空气捕集已成为解决大量非点源二氧化碳排放的有前途的技术。然而，由于大气中CO ₂ 浓度较低，其再生过程的能量损失非常高。本文旨在探索利用太阳能和空调回收的冷凝热的变温真空吸附系统的潜力。着重研究室内环境参数特别是相对湿度对碳捕集过程的影响。结果表明，相对湿度为40%时热耗最小，为12.16 MJ/kg。然后从技术经济角度对太阳能结合冷凝热回收、太阳能、冷凝热、电力四种不同能源供应吸附剂再生的方式进行比较分析以寻求最佳系统配置。同时研究了各种室内环境条件，如温度、相对湿度和二氧化碳浓度，对复合系统的影响。结果表明，随着温度的升高和CO ₂ 分压的降低，DAC的平准化成本(LCOD)和净现值计算成本(NPV)均增加。在有水存在的情况下，由于增加的吸附能力和再生能耗之间的平衡，最终在30%相对湿度下经济性能最佳。通过构建该新型复合系统，有望在未来促进碳减排技术的发展。

更多关于“Direct air capture”的研究请见：https://www.sciencedirect.com/search?qs=direct%20air%20capture&pub=Applied%20Energy&cid=271429

Abstr act

Direct air capture (DAC) has emerged as a promising tool to address the sizeable non-point sources of CO ₂ emissions. However, energy penalty of its regeneration process is extremely high due to the low CO ₂ concentration in the atmosphere. This paper aims to explore the potential of a temperature vacuum swing adsorption (TVSA) system for DAC which utilizes solar energy and condensation heat recovered from air conditioners. The effect of indoor environmental parameters especially for relative humidity (RH) is targeted for carbon removal processes. It demonstrates that 40% RH is the optimal value with regard to the minimum heat consumption of 12.16 MJ/kg. Then four representative cases with different energy supply methods for the regeneration processes, i.e., solar-assisted condensation heat recovery, solar energy, condensation heat, and electricity, are compared and analyzed in terms of techno-economic aspects to seek the best system configuration. The effects of various indoor environment conditions, e.g., temperature, RH, and CO ₂ concentration are also counted. The results demonstrate that the levelized cost of DAC (LCOD) and the cost calculated via net present value (NPV) increase with the increased temperatures and the reduced CO ₂ partial pressure. Due to a tradeoff between the increased adsorption capacity and regeneration heat in the presence of water, a minimum value of economic performance could be obtained at 30% RH. It reveals a novel and cost-effective TVSA combined system for DAC, which may bring more merits to approach carbon mitigation shortly.

Keywords

Direct air capture

Adsorption

Solar energy

LCOD

Graphics