Composition of dense phase pneumatic conveying system
Dense phase pneumatic conveying is a type of transportation with high concentration ratio, high mixing ratio, and low flow rate. Materials are pushed forward in the pipeline in the form of plugs or sand dunes, in a group manner. The main source of transportation power is the pressure difference between the front and rear of the material plugs to achieve material transportation, which mainly includes compressed air supply system, feeding system, control system, pipeline system, material warehouse and its auxiliary systems.
1) The compressed air source system mainly consists of an air compressor, oil removal machine, dryer, air storage tank, and pipeline, mainly providing high-quality compressed air for material transportation and air control components. High pressure Roots blower can also be used instead in short distance transportation.
2) The main purpose of the material supply system is to supply materials from low-pressure containers to high-pressure conveying pipelines, and to ensure as much as possible that the materials are evenly mixed with compressed air when entering the high-pressure pipeline. At present, the common feeding devices mainly include silo pneumatic conveying pumps, and high-pressure rotary feeders can also be used when the conveying distance is not far. At present, the main feeding devices used by our company include F-type silo pneumatic conveying pump, V-type silo pneumatic conveying pump, and L-type silo pneumatic conveying pump.
3) The control system is mainly controlled by a programmable controller PLC based on a microprocessor, which can achieve local manual control, automatic control, or remote computer centralized control. The actions of various mechanical components can achieve automatic operation and data collection of various control components in the conveying system, and manual operation switching function is also provided.
4) The pipeline system includes conveying pipelines, elbows, necessary diameter changes, and air supply valves, mainly to ensure that materials are transported in a closed state without causing pollution to the outside world, and to ensure the mixing state of materials with gas during the transportation process, in order to prevent the occurrence of pipe blockage.
5) The material warehouse and its auxiliary systems mainly include devices such as material warehouse, material level gauge, pressure vacuum release valve, dust collector, discharge valve, etc.
Characteristics of dense phase pneumatic conveying:
*Simple equipment configuration, small footprint, and low maintenance costs;
*High material to gas ratio, high material transportation concentration, and low system gas consumption;
*Low material conveying flow rate reduces material damage and equipment and pipeline wear;
*Flexible layout of conveying pipelines, achieving centralized, dispersed, high height, medium to long distance, and large capacity conveying;
*The bin pump can be used in parallel or series according to the actual needs on site, achieving continuous material transportation;
*The control system adopts PLC centralized control, with manual or automatic control set, with a high degree of automation;
*Sealed transportation, materials are not affected by moisture, pollution, and various climatic conditions, which is conducive to production and environmental protection;
*For materials with unstable chemical properties, inert gas transportation can be used;
*During the transportation process, multiple process operations can be achieved simultaneously, such as mixing, crushing, grading, drying, cooling, dust removal, etc.
*Suitable for conveying materials with high grinding properties such as coal powder, power plant fly ash, steel plant fly ash, aluminum oxide powder, various mineral powders, casting sand, cement, chemical raw materials, etc.
