Coordinated Control Strategy for Zero Liquid Discharge System of Desulfurization Wastewater Oriented Towards Deep Peak Shaving

Against the backdrop of high-proportion grid integration of renewable energy and in-depth peak regulation, the zero liquid discharge (ZLD) system for desulfurization wastewater in thermal power plants faces challenges such as large steam parameter fluctuation, unstable thermal load, and strong control coupling. To enhance system stability and energy efficiency under dynamic operating conditions, this paper proposes a coordinated control strategy for the ZLD system of desulfurization wastewater, specifically designed for in-depth peak regulation. A multi-level coordinated control framework is established to realize the dynamic coordination of steam supply, evaporation load and mother liquor concentration.. The strategy is subsequently validated through a pilot test at a coal-fired power plant, demonstrating its operational stability under various peak shaving loads and its effectiveness in reducing and stabilizing energy consumption. Results indicate that the proposed strategy can effectively improve the system's dynamic response characteristics, reduce energy consumption fluctuations, and enhance the operational reliability and economic benefit of the ZLD facility.