Pneumatic Conveying Material Seal Pump

The pneumatic conveying material seal pump is a new type of powder pneumatic conveying equipment, belonging to the low-pressure dilute-phase conveying category. It uses the ejection effect of high-speed air flow to convey powdery materials, and achieves the best use effect within the equivalent distance of 450m and lifting height of 40m.At present, it is widely used in the medium and short-distance conveying of dry and loose powders such as fly ash, alumina powder, dry kiln ash, cement powder and other dry loose powdery materials.

Working Principle of Pneumatic Conveying Material Seal Pump:

The material seal pump uses the air jet effect to make air drive ash particles to convey ash to the ash silo. The material seal pump is mainly composed of four parts: nozzle, cylindrical pump body, nozzle adjustment device and bottom vaporization device. The energy of the material seal pump during operation comes from two parts: one part is the kinetic energy of the fan, and the other part is the potential energy of the material column.The higher the material column, the greater the potential energy and pressure, and the corresponding larger the conveying capacity; on the contrary, the smaller it is.When the material seal pump works normally, it maintains a certain material level height. When the discharge volume of the electric precipitator increases in a short time while the material seal pump still works normally, the material level height will rise naturally. With the increase of the material level height, the material pressure increases, the potential energy increases, and the conveying capacity increases accordingly until the system reaches automatic balance. When the discharge volume of the electric precipitator decreases in a short time while the material seal pump still works normally, the material level height will decrease naturally. With the decrease of the material level height, the material amount decreases, the potential energy decreases, and the conveying capacity decreases accordingly until the system reaches automatic balance.

Operating Conditions of Pneumatic Seal Pump:

• A necessary condition for the normal operation of the material seal pump is that there must be a certain material seal height. The pressure of the silo material level must be greater than the positive pressure inside the material seal pump during operation. The positive and negative pressures are isolated by the material level pressure, and the wind pressure of the fan conveys the material away. Therefore, a certain material level height is essential.
• A dust collector must be installed on the material receiving silo, and the air exhaust volume of the dust collector must be greater than the air intake volume of the ash conveying fan. Otherwise, when the air intake volume is greater than the air exhaust volume, the pressure inside the material receiving silo will be forced to increase, resulting in unbalanced system pressure, high pipeline resistance, and the incoming air will flow back from the material seal pump to the part above the silo, making the material seal pump unable to work normally.

Maintenance of Material Seal Pump:

• Before the operation of the material seal pump, an appropriate amount of engine oil should be added to the movable air duct box to lubricate the oil seals at both ends of the movable air duct. An appropriate amount of mechanical oil should be added to the reducer of the adjustment mechanism according to the position of the oil standard line. Use N46 oil in winter and N68 oil in summer. Change the oil within one month after the initial commissioning, and generally change it twice a year afterwards.
• Frequently check the filter cloth in the vaporization device, usually once every six months.
• No other maintenance is required, and there are few wearing parts. Check the scouring condition of the tapered and divergent pipes in the diffuser pipe after one year, and replace them if they are severely worn.