Page 62 - Demo

PRODUCTION TECHNOLOGY62 PRODUCTION TECHNOLOGY AAC WORLDWIDE %u2022 2.2025Table 1 shows that due to different applications and manufacturers, the technical parameters of different slurry pumps vary to some extent. However, from the perspective of production applicability in the AAC industry, among vertical pumps, mud pumps are inferior to slurry pumps, and slurry pumps are inferior to suspended shaft pumps. When comparing vertical pumps with horizontal pumps, vertical pumps are obviously superior to horizontal pumps, with the exception that the performance of mud pumps is seriously unsuitable. Once a vertical pump has stopped, the slurry automatically returns to the slurry tank and will not deposit in the pump body, thus causing no damage to the pump body. Different structures of vertical pumps have a significant impact on service life and failure rate. The impeller support of a mud pump is situated below the material level. This structure works well for water or mud with a relatively low density, but for the slurry in the AAC industry, which usually has a density greater than 1.38 g/cm%u00b3, it is clearly not suitable. Although the slurry pump improves the wear-resistance of the flow-through components, the wear problem has not been fundamentally solved. For the suspended shaft slurry pump, since the transmission support of the shaft is not situated below the liquid level, damage from the working medium is avoided, the failure rate is reduced, and the service life is increased. Although horizontal pumps require flushing with clean water after operation, some sediment always remains. If the operator is negligent, the sediment will increase significantly, causing malfunctions of the horizontal pump. Due to the relatively high operating load and high start-stop frequency, the failure rate will increase considerably.Name and model and rated parametersPowerkWEfficiency%Failure rate %Operating life of impeller m3/hWeightkg Name Flow rate/head Outlet pipe diameter/submerged depthVertical mud pumpNL100A-16 80-100/15-17 100/1,940 15 61 5.0 3,500/158 270Vertical slurry pump100ZJL-A34 74-293/5.5-37 100/-- 15-45 65.8 1.0 155,520/3,375 640Suspended shaft vertical pump DYS100-120 A 91/25.4 120/2,100 18.5 52.5 0.5 256,608/5,568 950Horizontal slurry pump80D-A36 41-167/8.9-47 80 37 62.4 2.0 155,520/3,375 480Horizontal slurry pumpDZG80-30-70 120/25 80 22 66 2.0 155,520/3,375 500The service life of the impeller is calculated according to the output of AAC (m%u00b3) and the running time (h, including the interval time).Table 1: Comparison of slurry pump performance characteristics.Fig. 3: Schematic diagram of the arrangement of slurry pumps in the cutting sectiona) Installed with a vertical pump. b) Installed with a horizontal pump.