The highly efficient closed cycle spray dryer controls the contact process between hot air and materials through a closed cycle system. It is suitable for drying materials that are easy to oxidize and contain valuable or toxic ingredients, and can reduce material loss and environmental impact. The operation of the equipment relies on the coordination of systems such as feeding, atomization, heating, and cyclic separation. The specific usage method is as follows:
1、 Preparation before use
1Equipment and System Inspection
Check the appearance of the equipment and confirm that the casing and pipelines are not damaged; Check if the valves of the closed-loop system are closed and if the seals at the interfaces are intact; Check if the connection wires of the feed pump, atomizer, and fan are secure, and if the power and air supply connections are normal.
2Preparation of materials and media
Preprocess materials according to drying requirements, adjust concentration, filter impurities, and ensure that the material state meets the equipment adaptation range; If the material requires inert gas protection, check the inert gas reserve and pipeline connection in advance to confirm the gas purity; Prepare the heat transfer medium for the hot air system and check its liquid level or storage capacity.
3System sealing test
Close all drain valves and sampling valves, open the inert gas inlet valve or air valve of the closed-loop circulation system, slowly increase the pressure to the specified low pressure range of the equipment, maintain it for 5-10 minutes, observe whether the pressure gauge value is stable, and check whether there are leaks at the pipeline interface and valve. If there are leaks, stop the machine for maintenance.
2、 Startup operation process
1Start the auxiliary system
If inert gas is required, first open the inert gas system and introduce it into the closed-loop circulation system to replace the air inside the system; Start the circulating fan and cooling system to ensure stable circulating airflow. After the system pressure and airflow velocity reach the set initial values, start the hot air system and slowly raise the temperature to the preset inlet temperature.
2Start the feeding and atomization system
After the hot air temperature stabilizes at the set value, start the feed pump and slowly deliver the material to the atomizer at the preset flow rate; Simultaneously start the atomizer, adjust the speed or pressure, observe the atomization effect, and gradually adjust to the normal feed flow rate after the atomization is stable.
3Confirm the operating status of the system
Within 10-15 minutes after starting up, continuously monitor the temperature, pressure, material flow rate and other parameters of the closed-loop system to confirm that all values are stable within the set range; Check the feeding status of the product collection device to ensure that the dried product can be collected normally without blockage.
3、 Monitoring and adjustment during operation
1Real time monitoring of parameters
Record the hot air inlet temperature, outlet temperature, system pressure, and feed flow rate every 30 minutes. If the outlet temperature is too high, reduce the hot air temperature or increase the feed flow rate appropriately; If the outlet temperature is too low, adjust it in reverse and gradually adjust it.
2Material and product inspection
Regularly take samples to check the moisture content and particle size of the dried product. If it does not meet the standards, adjust the operation based on the parameter monitoring results; Observe the atomizer sight glass. If the mist droplets are uneven or there is material adhesion, check whether the feeding pipeline is blocked and whether the atomizer is worn, and clean or maintain it in a timely manner.
3Abnormal situation handling
If the system pressure suddenly rises during operation, the feed flow rate should be immediately reduced, the circulation pipeline and collection device should be checked, and blockages should be cleared; If the temperature drops sharply, the feeding should be paused, the hot air system should be turned off, and the fault should be investigated before restarting.
4、 End operation steps
1Gradually stop feeding and atomization
After the material processing is completed, first turn off the feed pump and stop feeding the atomizer; After the residual material in the atomizer is atomized, turn off the atomizer and continue to maintain the operation of the hot air system and circulation system to dry the residual material in the system.
2Cooling and system replacement
Turn off the hot air system when the outlet temperature of the system drops to around room temperature; If inert gas is used, continue to introduce it for a period of time to replace residual solvents or material vapors in the system, and then turn off the inert gas system and circulating fan; Open the system pressure relief valve and slowly release the pressure to atmospheric pressure.
3Cleaning and organization
After power failure, dismantle the product collection device and clean the residual products inside; Clean the feeding pipeline, atomizer, and circulation pipeline with an appropriate cleaning agent, rinse with clean water after cleaning, and air dry; Clean the equipment casing and operation panel, organize power lines and pipelines, close all valves, and keep usage records.