Tunnel Dryer - An Adjustment of Tray Drying Machines

Tunnel dryers are an enhancement towards the Tunnel Drying Machine, the materials loaded on trolleys move through a tunnel with hot air for drying and collection. They truly are for sale in different configurations like counter-current, cross flow etc.

Arad machinery offers an array of industrial tunnel dehydrators with customized designs and dimensions to meet up with the exact customer requirements. These have advanced design with mild steel body and thermal insulation to ensure performance that is consistent.

Temperature Control

Tunnel dryers are large-scale dryers that may process a rather high level of food material. They normally use either conductive or convective heat transfer methods. The main control unit of the dryer monitors the temperature and moisture level when you look at the tunnel. The machine also controls the  air flow inside and out of the tunnel and the conveyor speed.

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The operating that is optimum when it comes to tunnel is 55°C. The PLC-controlled control system uses a simple CP-1015 module and OS-1401 module that is extending. The CP-1015 module has two AOs that are 12-bit four 12-bit AIs. The module that is extending 12 TTL outputs.

The temperature control system in the Tunnel Box Drying Machine is made to prevent over shoot and steady state error. It performs this by managing the fan outlet to obtain an temperature that is optimal drying. The temperature can also be controlled automatically to make sure that this product in the chamber just isn't heated beyond a level that is specified. Moreover, the device also controls the recirculation associated with air that is hot.

Conveyor System

The product to be dried is positioned in trays on trolleys and slowly moved through a tunnel where air that is heated passed on it. A few of the heat is transferred through radiation plus some through conduction. This type of dryer is usually used for fruit drying such as for instance oranges, mandarins and lemons.

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Prior to the products enter the tunnel dryer, any adhering moisture is removed on a pre-de-watering belt by suctioning, tapping and blowing. This is accomplished to make certain a high quality and good appearance for the finished products.

A tunnel dryer could be operated using several methods of heating the  air, such as for example electric, gas, LPG and coal. The heated air is blown to the tunnel chamber by circulation fans and it is then circulated throughout the product to be dried. The evaporation rate increases with increasing air velocity. The reason being the actual quantity of water within the tray is proportional towards the  air speed.

Air Flow

Tunnel dryers are a modification of tray drying machines. They allow materials to continuously enter and exit, making it possible for faster drying and higher production rates. They are used in a wide selection of products and may be configured for any type of drying process. The atmosphere in these machines is heated by radiation, gas heating, or conduction. The product that is resulting clear of contamination and will easily be shaped to fulfill customer specifications.

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The input voltage u1(t) has the standard shape of a second-order overdamped system without overshoot in this model. It is controlled via a 25-pin CANON interface, which interconnects the tunnel model with a control and supervisory subsystem.

An decoupler that is ideal rule can also be provided to avoid overshoot. This algorithm also ensures a smooth and operation that is stable. This control algorithm could be implemented using a PLC or a PC designed with Matlab.

Energy Efficiency

The drying process is done with hot air that circulates continuously within the tunnel. The air is heated either through conductive or convective heating method.

The warmth transfer through the heating element towards the material is accomplished with a screen conveyor dryer or a Belt Dryer. The conveyor system comes with trolleys which can be laden up with the materials to then be dried and pushed or moved in one direction through the tunnel.

Tunnel and collected

The trays with all the materials that are dried then taken out of the tunnel and collected. The temperature of the material is monitored through infrared thermometers. The energy that is optimum is achieved through a zone control system that adjusts the temperature on the basis of the drying progress conditions. This gives the machine to save energy and money during the same time. The efficiency can be increased by decreasing the motor usage. This might be a benefit that is great car wash businesses that have high electricity consumption.