Project Introduction: In the northern regions of China, due to water scarcity, the development of thermal power units has been greatly restricted. Many newly built power plants often have to adopt dry desulfurization systems with high investment, high operating costs, and lower desulfurization efficiency because of the shortage of water consumption indicators. The initial investment for a 600MW unit's dry desulfurization system can reach 700 to 800 million yuan, while a wet desulfurization system with very high desulfurization efficiency only requires 120 to 150 million yuan. Therefore, it is very necessary and has a huge application background to study how to significantly reduce the water consumption of wet desulfurization systems. Outcomes and Advantages: Flue gas generally passes through the desulfurization tower in a saturated state, taking away a large amount of moisture. For wet desulfurization systems, the water carried by the saturated flue gas to the atmosphere accounts for more than 90% of the total system water consumption. By reducing the temperature of the flue gas after desulfurization, the saturated wet flue gas will condense, allowing for the recovery of a large amount of moisture and significantly reducing the system's water consumption. Even achieving zero makeup water for wet flue gas desulfurization. However, since the outlet temperature of the desulfurization tower is generally around 50°C, there is a problem of low-temperature corrosion. At the same time, there is a lack of systematic research on the structure and heat transfer coefficient of the condenser heat exchanger, the efficiency of condensate water recovery, and the methods for recycling low-grade heat. Therefore, there are no precedents for the mature application of this technology in large coal-fired units at home or abroad. In recent years, the School of Energy and Power Engineering at Xi'an Jiaotong University has explored the possibility of recovering moisture from the flue gas of coal-fired power plants and obtained detailed experimental data, which can support the industrial demonstration application of this topic. This topic will conduct experimental research on the factors and laws affecting the moisture and heat recovery process of the flue gas at the outlet of the desulfurization tower, and analyze specific issues in the industrial implementation plan. It will provide theoretical and experimental foundations for water-saving projects in wet flue gas desulfurization systems.