Fluidized bed drying process for ammonium sulfate

Abstract

The invention relates to a fluidized bed drying process for ammonium sulfate. The process flow includes that wet ammonium sulfate materials from the upstream are firstly mixed with dried return ammonium sulfate, are pre-dried, then flow into a fluidized bed, are dried and cooled in the fluidized bed, discharged from a discharging port and conveyed to a finished ammonium sulfate bin. Parts of materials dried in the fluidized bed return to a mixing pre-drier, drying air enters a fluidized bed drying chamber after demisting, dust removal, fan pressurization and indirect steam heating, and cooling air enters a fluidized bed cooling chamber after demisting, dust removal, fan pressurization and cooling and demisting through freeze water. Hot air and cold air entering the fluidized bed are converged and exhausted at the top of the fluidized bed, extracted by an induced draft fan after dust removal and demisting through a wet spray washer and a washing tower, and evacuated after further demisted by an outlet demister. A circulating water pump provides washing water and delivers washing liquid. The fluidized bed drying process has the advantages of reasonable setting of the flow, fine operability, controllable material cooling effect, small occupied space of equipment, less project investment and the like.

Description

Technical field [0001] The present invention involves a drying process for the ammonium sulfate in the production process of hebramide production technology, which is a chemical field. Background technique [0002] With the continuous improvement of the living standards of the people in my country, the demand for nylon fiber, engineering plastics, plastic film and other demand for nylon 6 and nylon 6 as raw materials increased a lot.Headamide is the main raw material for producing nylon 6 and nylon 6. Therefore, the production capacity of hebamide has grown rapidly in recent years.At present, in the dominant production process of 胺 目前 目前, every 1 tons of 己 目前 目前 is produced, and it will have a spinning of 1.5 tons -4.2 tons of ammonium sulfate. [0003] Among the existing hebramine production devices, ammonium sulfate is the last process before the ammonium sulfate products enter the product warehouse.At present, the mainstream drying process of ammonium sulfate is the dried proc...

AI Technical Summary

Problems solved by technology

[0004]First, when the moisture content of the upstream wet ammonium sulfate material increases or "loosing" (that is, the phenomenon of flowing aqueous solution) occurs, the operating cycle of the fluidized bed dryer is short , prone to "sitting on the bed" (that is, the bed material cannot be fluidized);

[0005]Secondly, the fluidized bed material cooling performance is poor, and it is difficult for the fluidized bed outlet material to meet the material temperature required for packaging in summer;

[0006]Third, there is still dust after exhaust cyclone dust removal, which will stick to the blades of the induced draft fan, causing the fan blades to become unbalanced, causing vibration, and corroding the fan blades at the same time;

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