Process description for three stage of hydration system

The quicklime stored in the lime storage bin, with a particle size of ≤10mm, falls into the guide groove of the high-temperature resistant belt conveyor through the manual flat gate and the inclined chute below it. The manual flat gate is mainly used for subsequent equipment maintenance, and the material flow can be controlled by the opening size; The high-temperature resistant belt conveyor sends lime from two lime storage bins into the bucket elevator, which delivers quicklime below 10mm to the raw material storage bin; The cache bin is equipped with high and low material levels, which can be used to determine whether the material in the bin is full or empty based on the level gauge alarm. The cone of the cache bin is equipped with a bin wall vibrator, which can clear the lime particles that are not smoothly discharged.

The bottom of the cache compartment is equipped with a manual screw valve, which functions similarly to the manual flat valve and is used for equipment maintenance. A belt weigher is installed under the valve, which has a quantitative feeding function and can adjust the feeding amount in a timely manner according to production needs, achieving accurate measurement of quicklime; The measured quicklime is uniformly and continuously fed into the three-stage tower-type hydration machine through a star shaped unloader. The water quantity measured by the flow meter in the water supply control system is interlocked with the lime quantity on the belt weigher through PLC control. The amount of water entering the three-stage tower-type hydration machine is adjusted according to the lime quantity on the belt weigher. The lime and water react fully in the digester and pass through the three-stage digestion unit in turn. The quicklime and water are fully stirred, and the lime digestion is completely completed. An air box pulse bag dust collector is installed above the three-stage digester to timely extract the high humidity gas generated during the digestion process and the extracted flue gas. The temperature is around 80-90 ℃. In order to accelerate the digestion reaction rate, hot flue gas is used to heat the digestion water. The induced draft fan introduces hot flue gas into the heat exchange water tank, and a spray water pump is installed at the bottom of the heat exchange water tank to extract the water from the tank. The water is sprayed into the two-layer spray area through pipes and nozzles. The hot flue gas and spray water undergo reverse heat exchange in the heat exchange water tank, and the flue gas after heat exchange is discharged through the chimney above the heat exchange water tank. Hot water circulates in the water tank, and through the continuous reciprocating process described above, the hot water in the tank stabilizes at around 60 ℃. It is then pumped into the first stage digestion machine through the digestion water pump.

The hydrated lime powder from the outlet of the three-stage hydration machine is fed into the ceramic powder separator machine through the screw conveyor  and bucket elevator . The hydrated lime is divided into two different fineness levels under the rotation of the powder selection machine rotor and the suction effect of the fan. Materials with a fineness of 325 mesh are fed into the bucket elevator through the screw conveyor . The bucket elevator sends the finished products into the feed inlet of the reversible screw conveyor. The motor of the reversible screw conveyor can rotate in both directions, and the finished products are sent into two finished product warehouses through the switching between forward and reverse rotation. A dust collector is installed on the top of the finished product silo. Dust from the finished product warehouse during the transportation process through connecting pipelines. The 325 mesh coarse waste residue from the powder selection machine is sent to the waste residue bin through a screw conveyor. The waste residue bin is equipped with a manual screw valve and a jumbo bag packer, and the waste residue is cleaned regularly.

Two finished product silo are each equipped with one double mouth packaging machine, which packages hydrated lime into 25kg/bag. Two finished product warehouses are equipped with one electric flat gate and one screw conveyor at each cone, which are used to load finished products into bulk loading trucks.