The absorption of CO₂ using solvents (e.g., amines) is considered a state-of-the-art, albeit energy-intensive process for CO₂ capture. While it is generally recognized that the utilization of waste heat has potential to reduce the energy-associated costs for CO₂ capture, the cost of waste heat recovery is seldom quantified. In this work, the cost of heat-collecting steam networks for waste heat recovery for solvent regeneration is estimated. Two types of networks are applied to waste heat recovery from the flue gases of four process industries (cement, silicon, iron & steel, and pulp & paper) via a heat recovery steam generator (HRSG). A novel approach is presented that estimates the capital and operational expenditures for waste heat recovery from process industries. The results show that the overall cost (CAPEX + OPEX) of steam generated from one hot flue gas source is in the range of 1.1–4.1 €/t steam. The cost is sensitive to economic parameters, installation factors, the overall heat transfer coefficient, steam pressure, and to the complexity of the steam network. The cost of steam from an existing natural gas boiler is roughly 5–20-times higher than that of steam generated from recovered waste heat. The CAPEX required to collect the heat is the predominant factor in the cost of steam generation from waste heat. The major contributor to the CAPEX is the heat recovery steam generator, although the length of the steam pipeline (when heat is collected from two sources or over long distances) is also important for the CAPEX.

使用溶剂（例如，胺）吸收CO ₂被认为是最先进的，尽管耗能高，但用于CO _2的捕集。尽管人们普遍认为，利用余热有潜力降低与CO ₂能源相关的成本捕集，余热回收的成本很少量化。在这项工作中，估算了收集蒸汽网络以回收废热以再生溶剂的成本。通过热回收蒸汽发生器（HRSG），将两种类型的网络应用于从四个过程工业（水泥，硅，钢铁，纸浆和造纸）的烟气中回收余热。提出了一种新颖的方法，可以估算过程工业废热回收的资本和运营支出。结果表明，从一种热烟道气产生的蒸汽的总成本（CAPEX + OPEX）在1.1–4.1€/ ​​t蒸汽的范围内。成本对经济参数，安装因素，总传热系数，蒸汽压力以及蒸汽网络的复杂性敏感。现有天然气锅炉的蒸汽成本比回收的废热产生的蒸汽成本高5至20倍。收集热量所需的资本支出是废热产生蒸汽的成本的主要因素。CAPEX的主要贡献者是热量回收蒸汽发生器，尽管蒸汽管道的长度（当从两个来源收集热量或长距离收集热量时）对于CAPEX也很重要。