The production line of Limestone Desulfurization Technology

At present, the most common power plant desulphurization process is limestone, gypsum powder dry wet desulfurization process. The power plant desulfurization all cannot do without the lime stone powder, lime powder is the use of some chemical reaction to achieve desulfurization effect. Limestone powder dry desulfurization process: Dry desulfurization limestone injection into the furnace and the calcium activated. The process can be divided into two main stages: the process of spraying calcium and furnace furnace humidification activation. Using the MTW European version of trapezium mill and vertical mill limestone ground to 325 mesh of limestone powder (CaCO3), and let the dry lime powder, using pneumatic injection into the upper furnace, furnace temperature is 850 to 950 DEG C region. The flue gas enters through the vertical flue activator and activator to upper, spraying water for humidification. The reaction of CaO with water gas generation in the reaction has high activity at low temperature. In order to ensure the desulfurization ash dry process is a dry state, and the system has the best desulfurization efficiency, there must be strict control of water quantity and water droplet diameter. Limestone - gypsum wet desulphurization process: Firstly, lime and limestone and other processed into fine powder, using pneumatic spray into the absorption tower, then adding water into the limestone slurry, esp from flue gas out of the heat exchanger through booster fan GGH BUF into the absorption tower, Abs into the flue gas is cooled, and is mixed with limestone slurry.

Flue gas on the limestone slurry washing, sulfur can be removed more than 95% of the flue gas. At the same time, but also in the flue gas of hydrogen chloride removal of nearly 100%. In the top of the absorber, the flue gas passes through the mist eliminator Me, removal of suspended water droplets. Limestone gypsum slurry from the absorption tower in the sedimentation tank is pumped into the nozzle is arranged at the top of the tower set tube. In the limestone gypsum flue gas with dilute it with the increase in plasma spray tower falling edge. The water dissolved into the solution of SO2 in the flue gas, and the neutralizing alkaline substances, so that the sulfur removal in flue gas. The calcium carbonate in limestone with sulfur dioxide and oxygen (the oxygen in the air) reaction, and ultimately generate gypsum plaster, which precipitated from the solution in a settling tank. Gypsum slurry by absorption of extraction tower in the sedimentation tank, concentrated, dehydration and washing after the first store, and then from the local. Including the wet limestone desulfurization process and dry desulfurization process contrast features: high desulfurization efficiency, desulfurization rate of over 95% in general, the absorbent utilization rate is also very high, generally more than 90%; reliable, mature technology, the reliability of the equipment to reach more than 98%; the use of a wide range, suitable for low sulfur coal, high; absorbent cheap price, rich in resources; comprehensive utilization for desulfurization by-products. Power plant desulfurization dry wet process cannot do without limestone, the limestone powder particle size also has a certain influence on the desulfurization effect, its size in 250 -325 mesh, 325 mesh limestone desulfurization effect is better, the general use of the equipment MTW European version of trapezium mill and vertical mill environmental protection and energy saving, which has the characteristics of the finished product size, can be adjusted between 250-325 mesh.