ABSTRACT

Emission amount of blast furnace gas (BFG) is huge per year and it cannot be directly combusted due to its low heat value. Separating and Enriching CO from blast furnace gas provides an effective way for its utilization. This paper proposes an improved adsorption isotherm model of CO on CuCl/Y adsorbent. A CO/CO₂/N₂ multi-component adsorption equilibrium model and a set of mathematical models for CO separation and enrichment from BFG by using a fixed bed are established. Detailed characteristics of CO/CO₂/N₂ adsorption/desorption during Vacuum pressure swing adsorption (VPSA) process are revealed. Effects of adsorption/desorption pressure, cycle time, flow rate, purge operation, and thermal desorption temperature on CO separation and enrichment are further investigated. Optimized operation parameters are provided based on energy consumption analysis. For the purpose of purity >55% and lower energy consumption, conditions of <300 kPa adsorption pressure, 5–20 kPa desorption pressure, and 343–363 K desorption temperature are recommended.

摘要

高炉煤气（BFG）年排放量巨大，热值低，不能直接燃烧。从高炉煤气中分离富集CO为其利用提供了有效途径。本文提出了一种改进的 CO 在 CuCl/Y 吸附剂上的吸附等温线模型。建立了CO/CO ₂ /N ₂多组分吸附平衡模型和一套固定床高炉分离富集CO的数学模型。CO/CO ₂ /N _{2 的}详细特性揭示了真空变压吸附 (VPSA) 过程中的吸附/解吸。进一步研究了吸附/解吸压力、循环时间、流速、吹扫操作和热解吸温度对 CO 分离和富集的影响。根据能耗分析提供优化的运行参数。为了纯度>55%和更低的能耗，推荐条件为<300 kPa吸附压力、5-20 kPa解吸压力和343-363 K解吸温度。