Closed cycle spray drying and solvent recovery system

Abstract

The invention relates to a closed cycle spray drying and solvent recovery system which comprises a feed pump, a spray drying tower, a cyclone dust collector, a bag type dust collector, a filter, an air blower, a condenser and a heater, wherein the lower part of the spray drying tower is provided with an air-blast sprayer, and a nitrogen supply pipe is connected with the feed inlet of the air-blast sprayer; the air outlet of the spray drying tower is connected with the air inlet of the cyclone dust collector through a 1st pipeline, the air outlet of the cyclone dust collector is connected with the air inlet of the bag type dust collector through a 2nd pipeline, the air outlet of the bag type dust collector is connected with the air inlet of the condenser through a 3rd pipeline, the filter and the air blower are serially connected to the 3rd pipeline, the air outlet of the condenser is connected with the air inlet of the spray drying tower through a 4th pipeline, and the heater is serially connected to the 4th pipeline. The system product has the advantages of high yield, guaranteed quality and good security, and is not only suitable for feed liquid with good flowability, but also suitable for feed liquid with high viscosity and poor flowability.

Description

technical field [0001] The invention relates to a closed-circuit circulation spray drying and solvent recovery system. Background technique [0002] In the Chinese patent No. 200520107528.5, the utility model patent specification discloses a closed-loop centrifugal spray dryer, which includes a gas heater, a centrifugal spray drying tower and a cyclone separation device connected in sequence, and the airflow in the cyclone separation device The airtight dehumidifier, spray tower, condenser, gas-liquid separator and airtight blower are sequentially connected between the outlet and the air inlet of the gas heater; the air inlet of the gas heater is also connected with the external inert gas supply. pipe connected. The drying medium is nitrogen, which is driven by a closed-type fan and enters the filter to be purified and heated by a heater, and then enters the drying tower through the distributor. Heat and mass exchange, drying into powder products in a short period of time...

AI Technical Summary

Problems solved by technology

The above-mentioned closed-circuit centrifugal spray drying tower adopts an atomizing turntable, which is not suitable for atomizing feed liquid with high viscosity and poor fluidity, which largely limits the application range of the drying system

In the process of drying and solvent recovery, the remaining material dust enters the spray tower with nitrogen, and the last remaining fine powder in the hot and humid nitrogen is recovered by spraying, because about 10% of the material dust enters the spray tower with the drying medium , so the sprayed organic solvent will re-moisten the dust of the dried material, resulting in product waste and increased production costs

At the same time, there is a large amount of organic solvent stored in the spray tower, which poses a safety hazard

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