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Material seal pump . Professional manufacturer of pneumatic conveying equipment
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Some problems in the operation of cement conveying pumps
2019-09-19 Source: wglobalnba.com Author: Rich Machinery read: Times
Pneumatic conveying system is used for conveying cement. It has good process tightness, environmental protection and no dust, free from site and space restrictions, flexible process layout, low civil construction costs, fast construction speed, reliable equipment operation, and low maintenance costs. It is suitable for old plants. Transformation and selection. In the case where space is limited by using common conveying equipment such as air chute and chain conveyor, it is more convenient to use the pneumatic conveying system to convey the cement.
However, due to improper operation during installation, commissioning, and use, rough installation may cause some failures: poor material loading, blockage of gas accumulation in the inflation chamber, pneumatic conveying capacity fails to meet design requirements, and the material seal pump and bin body become positive pressure. The outward spraying, large smoke on the roof of the warehouse, etc., caused dust, serious environmental pollution, and emissions were not up to standard, and sometimes forced to stop grinding, making the system start up abnormally.
Cement conveying material sealed pump site
Problem
(1) The feeding of the material pump is not smooth, and the conveying capacity is low. The output of the mill is 35t / h. Because the capacity of the cement pneumatic conveying system cannot reach, the small silo above the material pump is full and forced to stop grinding.

(2) The pressure in the square silo of the material-sealed pump is high, and the flange of the valve plate is outward. The positive pressure above the pump body causes outward smoke, and the upper part of the cement silo overflows with smoke.

(3) There is dust on the roof of the cement warehouse.

(4) Roots fan pressure shows low, only 0.02MPa.

(5) There is material accumulation in the homogenizing gas chamber, and the air inlet and outlet pipes at the bottom of the pump body are full of material accumulation and are blocked.
The gap between the air nozzle and the nozzle is too small. The homogenizing wind comes from the main air duct of the Roots blower, enters the material sealing pump from the bottom of the material sealing pump through the branch pipe, and rushes to the material layer homogenizing area in the material sealing pump through the air chamber, gas distribution plate and filter cloth, so that the material flows. The purpose of homogenization is to make the material in the pump fluid and have fluidity. When the feed switch of the material sealing pump is turned on, a gap is generated between the conveying air nozzle and the nozzle, and a negative pressure is generated due to the diameter change of the main air pipe, and the material is sucked into the conveying pipe for transportation. However, at the beginning of use, the operation is unskilled, the air inlet valve of the air chamber is opened too large, and the switch of the feed adjustment device is turned on small or unopened, the gas in the inflation box and the fluidization area cannot be discharged, and a positive pressure is formed at the bottom of the pump , The wind will go up along the material pump, showing a positive pressure at the flange to overflow the material, a certain positive pressure also appears on the cement tank roof. The main reason is that the wind used for homogenization is too large. During normal use, the rotation angle of the adjustment device must be explored to find a suitable position. The damper can be opened in a moderate size, which can fluidize the material without causing excessive pressure. , Generate positive pressure to spill material.
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