As the global wave of low-carbon transition sweeps across the world, desulfurization in coal-fired power plants—a critical component of both environmental protection and energy security—is rapidly evolving toward greater efficiency, intelligence, and sustainability. The successful implementation of desulfurization in power plants hinges on the use of high-quality desulfurization agents. Limestone powder, leveraging the resource advantages of natural mineral deposits, offers a stable and readily available supply. It is compatible with various power plant desulfurization processes, enables resource recycling, and precisely meets the dual demands of green operations and cost control.

In recent years, newly constructed circulating fluidized bed power plants have generally adopted a combined approach of in-furnace desulfurization and out-of-furnace flue gas desulfurization. This approach fully leverages the convenience and low-cost advantages of in-furnace desulfurization while utilizing out-of-furnace flue gas desulfurization to further purify the flue gas.

In-furnace desulfurization: Fuel and limestone are fed into the furnace together. During fluidized combustion at 850–900°C, the limestone decomposes into calcium oxide upon heating, reacting with sulfur dioxide in the flue gas to form calcium sulfite, which is then discharged with the ash.

Extracombustion desulfurization: After the flue gas enters the tail flue, secondary desulfurization is performed using either a semi-dry or wet method. In the semi-dry method, lime slurry is injected to react with sulfur dioxide, forming sulfates. In the wet method, sulfur dioxide is absorbed through slurry scrubbing, producing gypsum for recovery and reuse.

In response to the evolving needs of the power plant desulfurization sector, we leverage our deep expertise in grinding technology to focus on the seamless integration of limestone grinding with CFB desulfurization processes. We develop end-to-end limestone grinding solutions that provide robust support for the upgrading of power plant desulfurization systems, continuously driving the sector toward greater efficiency, intelligence, and environmental sustainability.

As the core equipment of the system, the MTW European-style grinding mill operates stably and efficiently, with outstanding single-unit production capacity, precisely meeting the large-scale production demands of power plant desulfurization. Leveraging a PLC automation control system, it enables unmanned, intelligent production on-site. The project site features a rational layout that is clean and orderly, setting a new benchmark for best practices in the energy and environmental protection sectors.

To address the powder production needs of the power plant desulfurization sector, we have developed the MTW European-style grinding mill based on years of R&D and manufacturing experience. The equipment features multiple core advantages and employs innovative grinding technology. Breakthroughs have been achieved in various aspects, including the transmission system, lubrication system, air duct design, grinding roller and ring structure, finished product particle size control and classification system, air inlet volute design, and intelligent control systems. It is capable of simultaneously producing limestone powder of different particle sizes to meet the requirements of various desulfurization processes. It is widely applied in the limestone-gypsum flue gas wet desulfurization (FGD) process and in the preparation of limestone desulfurization agents for both in-furnace and out-of-furnace applications in circulating fluidized bed (CFB) boilers.