Pneumatic transport has two ways: dense phase transport and thin phase transport. The dense phase transport is usually in the positive pressure mode and the material is transported in the pipeline in the state of embolization, which requires higher equipment investment cost and slightly higher operating costs. It is suitable for fragile materials. There are two ways of dilute phase transport, positive pressure and negative pressure, to transport the material in a suspended state in the pipeline, which requires lower equipment investment cost and technology, slightly higher operating costs, suitable for non-breaking materials. There is also the intermediate phase transportation technology of vijay, in which the material is suspended in the pipeline with a relatively high solid-gas ratio, the equipment operation investment cost and operation cost are relatively low, and the application scope is wide.
Different materials are suitable for different transportation modes. Pneumatic conveying system is widely used in many industrial fields for conveying and dusting various materials. Different material conveying systems have different requirements for pipelines.