Introduction to the process flow of hydrated lime equipment
The technical process of the lime equipment is to add raw quicklime from the loader to the silo, evenly add it to the jaw crusher through the vibrating feeder, and crush it to about 30-50 mm. The dust generated during the crushing process of the equipment is introduced into the pulse bag filter outside the workshop by the induced draft fan through the dust cover of the jaw crusher, and the calcium oxide powder of the dust collector should be cleaned once a week.
The hydrated lime equipment adopts a double-shaft stirring structure, which has various functions such as stirring, crushing and agglomeration, and self-cleaning. Its unique paddle and stirring formula make the quicklime and water mix evenly, the reaction is sufficient, and it plays a role in the agglomeration generated during the reaction.
Hydrated lime equipment
The feed port of the digester is designed with a screw feed propeller to facilitate material transportation. In order to prevent the backflow of dust generated in the digestion process, the equipment is equipped with a special discharge port for steam and dust, which can be discharged to a special dust removal system through connecting pipes, and is used in conjunction with the DMC pulse dust removal Q device with the hydrated lime equipment, which can handle quicklime well. Dust and harmful gases produced during digestion. Waste dust and lime can be reused after use, and the environment has no dust pollution, which meets the requirements of environmental protection development.
The quicklime crushed by the hydrated lime equipment is lifted by the bucket elevator to the lime silo at the upper part of the digestion tank in the digestion workshop. The quicklime is evenly fed into the digester through the plug-in valve at the lower part of the lime silo and the weighing feeder (the feeding speed is 5t/h). At the same time, water was added to the digester at a ratio of 133603.5 (17.5 m3/h).
When the boiler is started, the hot water heated to 80 degrees in the hot water tank can be used in a few minutes (the heating medium of the hot water tank is saturated steam). When the temperature of the digester reaches above 90 degrees, the hot water in the hot water tank can be stopped and digested with cold water (circulating water can be used).
Quicklime and water can enter the digestion tank for digestion reaction under the high-intensity stirring of the stirring blade, and synthesize calcium hydroxide emulsion through hydration. Most of the residue of the hydrated lime equipment is 1642.6Kg/h sieved through the slag outlet of the digester and the vibrating screen, and the residue is sent to the slag pool outside the workshop through the conveyor.
The water vapor generated during the digestion process is collected by the dust hood at the end of the digester and discharged to the outside of the workshop, and then discharged after being treated by the water film dust collector.
The filtered coarse pulp flows into the coarse stock pool, and the slurry in the coarse stock pool is pumped into the rotary slag discharger from the slurry. The insoluble ash (120kg/h) separated by the rotary slag remover is separated by the vibrating screen and sent to the slag pool outside the workshop.
The above is all about the process flow of hydrated lime equipment. In fact, the mud treated by the hydrocyclone of the hydrated lime production line is about 22% (the flow rate is about 25m/h), and it enters the refined mud storage tank, and water is added to make the calcium hydroxide content reach 20%. Then it is pumped into the cyclization tower at a flow rate of 60m/h. In order to better meet the requirements of the cyclization process, the refined pulp storage tank of the hydrated lime equipment can be heated to 65 degrees for heat preservation, and the heating medium is saturated steam.