The vertical grinding mill desulfurization system has smooth process flow, low investment, fast production and easy management. When selecting the desulfurization limestone powder production process plan and equipment selection, new processes and technologies that are mature, reliable, economical, reasonable, practical and reliable should be adopted. As a designer and manufacturer of vertical grinding mill desulfurization systems, Guilin Hongcheng will introduce to you the desulfurization effect of vertical grinding mills today.
(1). Limestone grade
The grade of limestone is determined by the CaO content. The highest CaO content of pure limestone is 56%. The higher the purity of the limestone, the better the desulfurization efficiency. As a process designer, when designing ingredients, you must not only calculate its chemical composition, but also understand its physical properties. The calcium oxide content of first-grade limestone is 48%-54%; limestone does not necessarily require a higher CaO content, the better. Limestone with CaO>54% has high purity and is marbleized, difficult to grind, and has strong chemical stability, so it is not suitable for use as a desulfurization agent.
(2). Fineness of limestone powder
The smaller the particle size of limestone powder particles, the greater the mass specific surface area. Since the dissolution reaction of limestone is a solid-liquid two-phase reaction, the reaction rate is proportional to the specific surface area of the limestone particles. Therefore, finer limestone particles have better dissolution performance, higher various related reaction rates, desulfurization efficiency and limestone utilization rate. But the smaller the particle size of limestone, the higher the energy consumption of crushing. Limestone powder is usually required to have a screening rate of 95% through a 325 mesh sieve (44 μm).
At the same time, the particle size of limestone powder is related to the quality of limestone. In order to ensure that the desulfurization efficiency and limestone utilization rate reach a certain level, when the impurity content in the limestone is high, the limestone should be ground finer.
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In the FGD process that uses limestone powder as a desulfurization agent, the limestone powder needs to go through a solid-liquid two-phase dissolution reaction, and the reaction rate is proportional to the specific surface area of the limestone particles. The smaller the particle size of the limestone particles, the greater the mass specific surface area. The limestone particles have better dissolution performance and higher various related reaction rates. However, the smaller the particle size of limestone, the higher the energy consumption of crushing. Limestone powder is usually required to have a screening rate of 95% through a 325 mesh sieve (44 microns). At the same time, the particle size of limestone powder is related to the quality of limestone.
In order to ensure that the desulfurization efficiency and limestone utilization rate reach a certain level, when the impurity content in the limestone is high, the limestone must be ground finer. The traditional tube mill technology is used to prepare limestone powder, which consumes a lot of energy, has low output, has a complicated process, and is difficult to control the fineness and particle gradation. With the development of grinding technology, vertical mill grinding technology is adopted. Because it adopts the material layer grinding principle, it has low energy consumption (20-30% lower than the power consumption of tube mill), and the product has stable chemical composition and particle gradation. Uniform and simple process flow.
The vertical mill grinding process adopts the principle of material layer grinding, with adjustable grinding pressure, low noise, low energy consumption, small wear, strong adaptability to materials, simple process flow, and high system efficiency. The whole system operates under negative pressure, resulting in little dust pollution. The vertical mill grinding process has uniform product particle gradation and adjustable product fineness (the product fineness can reach more than 600 mesh). At the same time, the product fineness can be quickly measured and corrected.
As a vertical grinding mill desulfurization system manufacturer, Guilin Hongcheng has rich experience in desulfurization vertical mill production and design. If you have desulfurization vertical grinding mill project requirements, please leave us a message to learn more about the equipment details.
