Working Mode of Pneumatic Conveying Silo Pump (Also Known as Silo Pump)

Pneumatic Conveying Silo Pump: A Detailed Explanation of Its Structure, Principle and Application. The pneumatic conveying silo pump (also known as the silo pump) is the core equipment of dense-phase pneumatic conveying systems. It is mainly used to convey powdery materials such as cement, fly ash, pulverized coal and mineral powder to designated locations (such as storage silos, blast furnace injection tanks, etc.) through compressed air. With advantages such as high conveying efficiency, low energy consumption and no dust pollution, it is widely used in industries such as electric power, metallurgy, building materials and chemical engineering.

 I. Core Classification of Pneumatic Conveying Silo Pumps. According to differences in working methods and structures, silo pumps can be divided into three categories: single-chamber pumps, double-chamber pumps and multi-chamber pumps. Different types are suitable for different conveying capacities and continuity requirements. Type Structural Features Working Mode Applicable Scenarios Single-chamber pump Single storage silo + fluidization device + discharge valve, simple structure Intermittent operation (cycle of loading → pressurization → conveying → depressurization) Medium and small conveying capacity (≤50t/h), short-distance conveying (≤100m) Double-chamber pump Two storage silos in parallel, sharing air source and conveying pipeline Alternating operation (one silo conveys while the other is loading) Medium to high conveying capacity (50-100t/h), continuous conveying requirements Multi-chamber pump Combination of 3 or more storage silos, coordinated and controlled by PLC Rotating operation of multiple silos to achieve near-continuous conveying Large conveying capacity (≥100t/h), long-distance conveying (≥200m) 

 II. Basic Structural Components of Silo Pumps. Regardless of the type, the core structure of the silo pump is designed around the functions of "material storage - fluidization - conveying", and it is mainly composed of the following components: (1) Main Components 1. Silo Body (Storage Tank) • Core Function: Store the powdery materials to be conveyed, usually in a cylindrical structure (with conical heads at the top and bottom). The material is selected as Q235B carbon steel (for ordinary materials) or 304 stainless steel (for corrosive materials) according to the material characteristics. • Key Design: A feed inlet is set at the top of the silo body (equipped with a feed valve such as a bell valve or gate valve), a fluidization cone is set at the bottom (to guide materials to concentrate towards the discharge outlet), and a level gauge (ultrasonic or radio frequency type, to monitor the material level in the silo) is set on the side. 2. Fluidization Device • Function: "Fluidize" the powdery materials in the silo (similar to the flow state of a liquid) to reduce conveying resistance, which is the core of the efficient conveying of the silo pump. • Composition: Includes a fluidization disc (installed at the bottom of the silo body, composed of a porous plate + a breathable layer, and the breathable layer is commonly made of silicon carbide or canvas) and a fluidization air pipe (connected to the compressed air source to introduce low-pressure air into the fluidization disc).

 3. Discharge System • Discharge Valve: Controls the on-off of material conveying, commonly a ball valve or butterfly valve, requiring good sealing performance and wear resistance (can be lined with ceramics or hard alloys). • Discharge Pipe: Connects the silo body to the main conveying pipeline, with the pipe diameter designed according to the conveying capacity (usually DN80-DN200). The pipe elbows are made of wear-resistant materials (such as bimetallic composite pipes). 4. Air Source and Control System • Air Source: Uses a screw air compressor to provide compressed air, matched with a dryer and filter (to remove moisture and impurities and avoid clogging the fluidization disc). • Control System: Composed of a PLC control cabinet, solenoid valves and pressure transmitters, which automatically controls the sequence of processes such as feeding, pressurization, fluidization and conveying.