At present, the common desulfurization process for power plant desulfurization is limestone and gypsum powder dry and wet desulfurization process.
Dry desulfurization refers to limestone powder injection and calcium activation in the furnace. Use MTW European trapezoidal mill or vertical mill to grind limestone to about 325 mesh limestone powder (CaCO3), and let the dry limestone powder be sprayed to the upper part of the boiler furnace with the furnace temperature of 850 ~ 950 ℃. The flue gas enters the upper part of the activator through the vertical flue, and atomized water is sprayed into the activator for humidification. The unreacted CaO in the flue gas reacts with water to form highly active CaO at low temperature. In order that the desulfurized ash in the dry process is dry and the system has better desulfurization efficiency, it is necessary to strictly control the amount of water spray and the diameter of water droplets.
The comparative advantages of wet limestone desulfurization process and dry desulfurization process include: high desulfurization efficiency, general desulfurization rate of more than 95%, high utilization rate of absorbent, generally more than 90%, reliable operation, mature technology, equipment reliability of more than 98%, wide range of application, suitable for low, medium and high sulfur coal, low price of absorbent, rich resources, and comprehensive utilization of desulfurization by-products.
The dry and wet desulfurization processes of power plants are inseparable from limestone powder, and the particle size of limestone powder also has a certain impact on the desulfurization effect. The required particle size is generally 250 mesh -325 mesh, and the desulfurization effect of 325 mesh limestone powder will be better. Generally, the equipment used are MTW European trapezoidal mill and vertical mill, which are good at environmental protection and energy saving, and the particle size of finished products can be adjusted between 250-325 mesh.
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