Flue gas from gas fired power plants contains 10–16% (w/w) water vapor with considerable amount of latent heat. Although CO₂ capture and utilization have received great attention, water capture from power plant has received limited attention. The power plants in Qatar exhaust 33 Million m³ of water per year. This paper explores selected alternative technologies namely absorption, compression & cooling, and quenching, to enable the recovery of water vapor contained in a base case 750 MW power plant flue gas streams. The alternatives for water capture were modeled and optimized over a wide range of operating conditions (pressure, temperature, and flow rate). Using data from an actual gas fired power plant in the state of Qatar, simulation studies were carried out and optimized for all modeled technologies to minimize production cost using Aspen HYSYS V8.6. The results show that the quench unit, operated at pertinent water circulation temperature (50 °C), pressure (6 atm), and flowrate of 3500 m³/h (recyclable), can extract up to 80.7% of the water in the flue gas. Apart from production cost and water capture percentage, criteria used to screen the alternative technologies were payback period, CO₂e emission and brine reduction rate. The research work determined that the quench alternative had the lowest payback period (8.8 years), lowest CO₂ emission rate (13 kg CO₂/m³ H₂O) and highest brine reduction (3.44%) among all the tested alternatives. The proposed quench water-recovery technology will have added value to Qatar and other nations with limited water resources, specifically those with access to natural gas resources.

燃气发电厂的烟道气中含有10％至16％（w / w）的水蒸气，并带有大量潜热。尽管CO _2的捕集和利用受到了极大的关注，但发电厂的水捕集却受到了有限的关注。发电厂中卡塔尔排气33百万米³每年的水量。本文探讨了选择的替代技术，即吸收，压缩和冷却以及淬火，以使基本案例中的750 MW发电厂烟道气中的水蒸气得以回收。在广泛的运行条件（压力，温度和流速）上对水收集的替代方案进行了建模和优化。利用来自卡塔尔州一家实际燃气发电厂的数据，对所有建模技术进行了仿真研究，并进行了优化，以使使用Aspen HYSYS V8.6的生产成本降至最低。结果表明，淬火装置在相关的水循环温度（50°C），压力（6 atm）和流量3500 m ^3下运行/ h（可循环使用），最多可提取烟气中80.7％的水。除了生产成本和水捕获百分比外，用于筛选替代技术的标准还包括投资回收期，CO ₂ e排放量和盐水减少率。研究工作确定，在所有测试的替代方案中，淬火替代方案的投资回收期最短（8.8年），CO ₂排放率最低（13 kg CO ₂ / m ³ H ₂ O）和盐水还原率最高（3.44％）。拟议中的骤冷水回收技术将为卡塔尔和水资源有限的其他国家（特别是那些拥有天然气资源的国家）增加价值。