Method and apparatus for hydration of calcium oxide
AssigneeChemco Systems L.P.
InventorMohamad Hassibi
Life of this patent
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Abstract
An improved system for slaking of lime which does not rely on the weighing of materials delivered to the vessel where the mixing takes place. A control system is utilized to control the volume of lime and water delivered to insure that a preselected temperature is obtained during the chemical reaction in the vessel. In a batch process the volume of lime and water is controlled based on the temperature sensed to maintain the temperature at the desired level. Once the reaction is complete the resultant slurry is discharged from the vessel for further processing. The vessel is then cleansed and prepared for the next batch.
Claims20
A process for hydrating lime in batches, comprising:
- a. measuring a first volume of lime for delivery to a slaker vessel;
- b. delivering said first volume of lime to said vessel;
- c. measuring a first volume of water for delivery to said vessel;
- d. delivering said first volume of water to said vessel;
- e. mixing said first volumes of lime and water in said vessel;
- f. pre-selecting a desired process temperature to be maintained in said vessel;
- g. measuring a process temperature in said vessel;
- h. controlling said process temperature by adding a second volume of either water or lime to achieve said desired process temperature;
- i. measuring said second volume of either water or lime;
- j. forming a corrected value based on said first and second volumes;
- and
- k. in a subsequent batch process, delivering a volume ratio of lime to water to said vessel based on said corrected value.
An apparatus for hydrating quick lime in a batch process comprising:
- a. a vessel for receiving lime and water for mixing, said vessel having sidewalls and a bottom portion for retaining said lime and water;
- b. a lime feeder for delivering lime to said vessel;
- c. a water conduit for delivering water to said vessel;
- d. a controller for controlling a temperature of a mixture of said lime and water to maintain said temperature at between about ±3° F. of a desired process temperature;
- e. a temperature sensor For sensing said temperature and providing it to said controller, said controller and said temperature sensor cooperating to control delivery of lime and water to said vessel;
- and
- i. a discharge valve associated with said vessel;
- wherein said controller cooperates with said lime feeder and said water conduit to deliver a volume ratio of lime to water to maintain said temperature of said mixture in a subsequent batch of lime and water consistent with a volume of water and lime delivered in a prior batch process to maintain said desired process temperature.
Dependencies are inferred from the claim text.