Dry Desulfurization Grinding Mill: The Core Power Equipment of Dry Flue Gas Desulfurization Systems

In industrial fields such as power, steel, chemical, and waste incineration, flue gas desulfurization is a core process for compliant emission. Compared with the pain points of the traditional wet desulfurization process, such as large wastewater volume, severe equipment corrosion, high later operation and maintenance costs, and difficulty in winter antifreezing, the SDS dry desulfurization process, with its advantages of zero wastewater discharge, simple process flow, wide adaptability, and convenient operation and maintenance, has become the mainstream choice for current industrial flue gas ultra-low emission retrofit. As the core key equipment of the dry desulfurization system, the dry desulfurization grinding mill directly determines the desulfurizer reaction activity, desulfurization efficiency, and the operating stability of the entire system, and is the core power of dry desulfurization compliance operation.

The core principle of dry desulfurization is to use ultrafine sodium bicarbonate (baking soda) powder to chemically react with acid pollutants such as sulfur dioxide, hydrogen chloride, and hydrogen fluoride in the flue gas to achieve flue gas purification. Unprocessed sodium bicarbonate raw material has coarse particles and small specific surface area, and its contact reaction with flue gas is insufficient, which not only leads to low desulfurization efficiency, but also causes a large waste of desulfurizer and material accumulation blocking pipes. The core function of the dry desulfurization grinding mill is to process bulk and coarse-grained sodium bicarbonate raw material into specified micron-scale ultrafine powder, maximizing the specific surface area and reaction activity of the desulfurizer, ensuring the stable operation of the desulfurization system.

At present, the mainstream dry desulfurization grinding mills mostly adopt an integrated crushing and classification structure, integrating the three functions of ultrafine grinding, airflow classification, and negative-pressure conveying, to achieve automated continuous operation. When the equipment runs, the sodium bicarbonate raw material is uniformly sent into the grinding chamber through a quantitative feeding system, and the material is finely pulverized through the combined action of collision, friction, and shearing of the high-speed rotating grinding body and ring gear. The pulverized powder enters the classification area with the rising airflow, and the particle fineness is controlled by the classification wheel speed. The qualified ultrafine powder is conveyed with the airflow to the flue or desulfurization reaction tower to fully react with the high-temperature flue gas; coarse particles that fail to meet the standard automatically fall back to the grinding chamber for secondary grinding, eliminating material waste and ensuring uniform and stable discharge particle size.

The sodium bicarbonate powder processed by the dry desulfurization grinding mill can have its particle size stably controlled at 20-25 μm, with D90 particle size deviation ≤ ±3 μm, concentrated particle distribution with very good dispersibility and permeability. At the same time, the ground powder forms a porous layered structure, and its specific surface area is more than twice that of the raw material, which can quickly decompose and activate in the high-temperature flue gas environment, fully react with the acid flue gas, with desulfurization efficiency above 95% and hydrogen chloride removal rate as high as 99%, fully meeting industrial ultra-low emission environmental standards.

Compared with traditional crushing equipment, the dedicated Peman dry desulfurization grinding mill is optimized for the grinding characteristics of brittle sodium bicarbonate material. The equipment adopts a negative-pressure enclosed operation mode with no dust leakage throughout, and the workshop operating environment is clean, meeting environmental production requirements. The integrated structure simplifies the process flow, requiring no additional screening and conveying equipment, greatly saving equipment footprint and infrastructure costs. The intelligent control system can adjust fineness, speed, and feeding amount, adapting to different working conditions and different flue gas concentration desulfurization needs, flexibly adapting to various industrial desulfurization scenarios.

At a time when industrial environmental protection is strictly controlled, the stability and efficiency of the dry desulfurization system are directly related to enterprise production compliance. As the core of the system, the dry desulfurization grinding mill not only solves the problems of low efficiency, high energy consumption, and secondary pollution of traditional desulfurization processes, but also helps enterprises reduce desulfurizer consumption, lower operation and maintenance costs, and avoid environmental risks. It is the core equipment for industrial flue gas dry desulfurization retrofit, widely adapted to flue gas treatment scenarios in thermal power, steel, coking, building materials, waste incineration, and the entire industry.