Bulk Material Handling is challenging part of industrial process. The type of conveying is depended on material nature, particle size, density and per hour capacity. Some materials such as sulphur, sugar, fertilizers, coal etc. are toxic, hazardous, flammable or explosive in nature. To prevent any disaster, these materials need to be handled pre-cautiously.
Closed loop conveying system is mainly used in situations where a high level of control over the material flow is required, such as in the processing of hazardous materials or in the manufacture of high-value products. The material is typically transported in a continuous flow, which can help to minimize any disruptions in the production process.
For this, Closed loop conveying is best suited method for conveying material between storage locations, or to feed different kinds of reactors in bulk. It uses a dilute phase or lean phase conveying system. However, mass flow rate & velocity of conveying medium affects the selection of either dilute phase or dense phase conveying system. Closed loop conveying specially designed when the material which is being conveyed have a property of being toxic, hazardous, or explosive in nature. In this type of conveying, an inert gas usually Nitrogen, is used as a medium in replace of air to convey the material. Being inert in nature, nitrogen reduces the risk of explosion & catching fire. By that means reducing the risk of damage. The amount of nitrogen consumed during conveying is relatively small as the system is equipped with nitrogen recirculation technique. In this type a pressure is maintained to convey the material and kept low compared to normal pressure based conveying system.