Design of a Rapid Vacuum Pressure Swing Adsorption (RVPSA) Process for Post-combustion CO2 Capture from a Biomass-fuelled CHP Plant
Design of a Rapid Vacuum Pressure Swing Adsorption (RVPSA) Process for Post-combustion CO2 Capture from a Biomass-fuelled CHP Plant
复制标题
DOI：
10.1016/j.jece.2017.07.029
复制
发表时间：
2017-08
影响因子：
7.7
通讯作者：
M. Luberti;G. Oreggioni;H. Ahn
中科院分区：
文献类型：
--
作者：
M. Luberti;G. Oreggioni;H. Ahn
设计了一种新型的RVPSA（快速真空变压吸附）装置，用于CO2的浓缩和回收，以实现积极的CO2捕集目标，即同时实现95+%的CO2纯度和90+%的CO2回收率，并应用于现有的10 MWth生物质燃料热电联产厂。生物质燃料热电联产厂被认为是碳中性的，因为其运行实际上为零，导致大气中的净CO2增加，忽略了辅助过程中涉及的CO2排放，例如土壤改良，生物质运输和加工等。此外，将生物质燃料热电联产厂与碳捕获，运输和储存相结合可以实现负碳能源发电，因为它的净效果是回收空气中的一些二氧化碳，然后通过工厂的运作将其储存在地下。顺便说一句，RVPSA工艺的特点是更有效地利用塔中的吸附剂，导致比传统吸附工艺高得多的床生产率。如此高的床生产率使得更容易扩大该吸附过程以将其应用于工业燃烧后捕获。设计并模拟了一套两级两床RVPSA装置，用于从CO2摩尔分数为13.3%的生物质热电联产烟气中捕集CO2。详细考察了吹扫比（P/F）和解吸压力等操作条件对比功耗的影响。结果表明，两级RVPSA装置的综合性能为：CO2回收率90.9%，CO2纯度95.0%，床层生产率21.2 molCO 2/kg/h，能耗822.9 kJ/kgCO 2。本研究设计的RVPSA装置的生产能力比传统的CO2捕集VPSA工艺高20-30倍。
It was aimed to design a novel RVPSA (Rapid Vacuum Pressure Swing Adsorption) unit for CO2concentration and recovery in order to achieve the aggressive CO2capture target, i.e. 95+% CO2purity and 90+% CO2recovery at the same time, applied to an existing 10 MWthbiomass-fuelled CHP plant. Biomass-fuelled CHP plants are deemed carbon-neutral on the grounds of the net CO2addition to the atmosphere as a result of its operation being practically zero, ignoring the CO2emissions involved in the ancillary processes, such as soil enhancement, biomass transport and processing, etc. Furthermore, integrating the biomass-fuelled CHP plant with carbon capture, transport and storage enables carbon-negative energy generation, as its net effect is to recover some CO2in the air and then store it underground through this plant operation. By the way, a RVPSA process features more efficient utilisation of the adsorbents in the column, leading to much higher bed productivity than a conventional adsorption process. Such a high bed productivity makes it easier to scale up this adsorption process for its application to industrial post-combustion capture. A two-stage, two-bed RVPSA unit was designed and simulated to capture CO2from the biomass-fuelled CHP plant flue gas containing 13.3% CO2mole fraction. Effects of operating conditions such as the Purge-to-Feed ratio (P/F) and desorption pressure on the specific power consumption were investigated in detail. It was found that the integrated two-stage RVPSA unit was capable of achieving the following overall performances: CO2recovery of 90.9%, CO2purity of 95.0%, bed productivity of 21.2 molCO2/kg/h and power consumption of 822.9 kJ/kgCO2. The productivity of the RVPSA unit designed in this study was 20-30 times higher than those of the conventional CO2capture VPSA processes.