Closed Circuit Boiling Dryer Overview

Closed loop boiling dryer is a closed loop system, at the beginning, start the fan, open the valve 1, close the valve 2, input inert gas (generally nitrogen), the original air in the system replacement, when the oxygen content of the system to reach the predetermined target, close the valve 1, open the valve 2. From this point on, the nitrogen in the system as a heat and mass transfer medium, to complete the drying of the purpose of the wet material. Wet materials containing organic solvent gasification, with nitrogen into the condenser, the solvent condensed into liquid into the tank, nitrogen due to the lower boiling point is not possible to liquefy, driven by the fan to enter the next round of circulation, closed-circuit drying system drying device can be selected according to the state of the material and the more demand for the circumferential cylinder boiling dryer, can also be a box-type boiling dryer, can be a vibration of the fluidised bed drier, even the air flow dryer, due to the material state and more demand for selection of cylinder boiling dryer, or box-type boiling dryer, can be a vibrating fluidised bed dryer, and even the dryer. Air flow dryer, because these dryers are fluidised drying, so the drying speed is fast, the drying time of the material is short.

Working principle of vertical closed circuit boiling dryer

Vertical closed-circuit boiling dryer adopts closed-circuit system, taking inert gas (generally nitrogen) as the circulating medium. The inert gas is first heated to a suitable temperature in the heating device and then enters the drying chamber. In the drying chamber, the material is fluidised by the hot inert gas and is in boiling state. The material is in full contact with the hot gas, and due to the temperature difference, the water or organic solvent in the material is rapidly vaporised.

The gas carrying the vaporised water vapour or solvent vapour leaves the drying chamber and enters the gas-solid separation device, which separates the solid material particles and prevents loss of material and blockage of subsequent equipment. Afterwards, the gas enters the condenser, where the water vapour or solvent vapour is condensed into a liquid to achieve gas-liquid separation. And the inert gas is re-sent back to the heating device through the circulating fan, which is heated and re-entered into the drying chamber for circulating drying.

Features of Vertical Closed Circuit Boiling Dryer

1、System is fully closed, basically no oxygen (content self-control). Together with the over, closed loop boiling dry smack machine system is in a fully closed state operation, neither (also not allowed) to the external leakage, nor (not allowed) to the internal leakage. For this reason, it must be done to all parts of the system, whether it is the pipeline interface, or box inlet and outlet; Whether in the positive pressure area, or negative pressure area: Whether it is static parts or dynamic parts, must be strictly sealed. Oxygen content in the system exchange does not exceed the process requirements, to ensure the safety of explosion-proof 00 flame-proof, but also to the fear of oxygen materials to provide the Division of reliable guarantee.

2, zero emission. If the line is a continuous operation, basically no exhaust emissions

3、Solvent recovery. If the system can work continuously, the solvent recovery rate is very high (* up to 98% or more), its economic significance is self-evident.

4、High degree of automation. Our company set up in the system temperature, oxygen content, system pressure and other three parameters of the automatic control and over-limit alarm device, using PLC control, easy to operate, safe and reliable.

Vertical closed-circuit boiling dryer scope of application

It is suitable for drying heat-sensitive, easily oxidised, organic solvent-containing and inflammable and explosive materials. Widely used in pharmaceutical, chemical, food and other industries, such as in the pharmaceutical industry for drying some of the temperature and oxygen-sensitive pharmaceutical ingredients, to ensure product quality at the same time, and effectively prevent the volatilisation of organic solvents and the oxidation of materials.

EXCLUSIVE LOGISTICS SUPPORT CUSTOMIZATION