Selecting a submersible mixer is a complex task; the correctness of the selection directly affects the normal operation of the equipment. The principle of selection is to ensure the mixer operates at full mixing efficiency within the appropriate volume, usually determined by flow rate.
Usage:
QJB ModelSubmersible mixerAvailable in two main series: Mixed Stirring and Low-Speed Plowing.
The Mixed Series Agitators are suitable for mixing suspended liquid in wastewater treatment plants and industrial processes.
Low-speed flow series mixers are suitable for industrial and urban wastewater treatment plant aeration basins, generating strong water currents with low tangential flow, which can be used to create water currents in stages such as circulation, nitrification, denitrification, and phosphorus removal.
FQJB Type Buoyant BuoyDiving agitator
The FQJB-type submersible mixing impeller is a modified version of the standard submersible mixing impeller, constructed with stainless steel buoyant floats. The specific model selection follows the QJB-type submersible mixing impeller specifications.
Application Scope:
The mixer should be able to run continuously under the following conditions:
1. Medium temperature not to exceed 40°C.
2. The medium's pH value is between 5~9.
3. Liquid density does not exceed 1150 kg/m³.
4. Long-term dive operations, with dive depths generally not exceeding 20 meters.
Key Points to Note:
Submersible mixers must be fully submerged in water for operation; they cannot be used in environments with flammable, explosive, or highly corrosive liquids. Steel expansion bolts must be securely fastened according to specifications, and the cables must be tightened and properly secured after installation.
Propellers of the submersible flow diverter are all made of polyurethane, equipped with a bevel gear box reducer.
Performance Features:
1. Compact structure, easy operation and maintenance, convenient installation and repair, and long service life.
2. The impeller features a rational hydraulic design structure, with backward-curved blades that have self-cleaning capabilities, preventing debris entanglement and blockage.
3. Mixing with the aeration system can significantly reduce energy consumption, increase oxygenation levels, and effectively prevent sedimentation.
4. Motor winding insulation level: F class, protection rating: IP68, equipped with NSK/SKF bearings. The motor can be optionally fitted with a condensation prevention device. The motor utilizes an over-temperature protection mechanism to ensure greater reliability in operation.
5. Two mechanical seals; the mechanical seals are sealed with silicon carbide material, and the rubber material is fluoroelastomer.
Model Representation Method:
Submersible Agitator Performance Parameters:
The mixer operates at a rated voltage of 380V, frequency of 50Hz, with a F-grade insulation level, IP68 protection rating, and under working mode I conditions.
Installation Method & Dimensions
Diving MixersThere are various installation options available. Here, we offer more universal methods for selection, with dimensions listed in the table below. Our company can also provide special designs according to customer requirements.
Submersible mixer, submersible flow accelerator dimensions
Installation System & Dimensions
Submersible mixers can be installed in various ways. Below are some of the more common methods, with others also available. These installations allow for quick assembly and disassembly of the submersible mixer without draining the pool's wastewater, ensuring both speed and safety.
FQJB Type Buoyant Submersible Mixing Pump Installation Site
Submersible mixers can also be installed with buoyant floats. The FQJB type buoyant float submersible mixer is a modified version of the standard submersible mixer, featuring stainless steel floats. It is primarily suitable for locations with uneven, non-firm pool bottoms where bridge structures are also difficult to install. Specifically designed for wastewater treatment plants, it is used for treatment modifications and river water purification without discharge.
Selection Considerations:
Selecting a submersible mixer is a complex task, as the correctness of the selection directly affects the normal operation of the equipment. The principle of selection is to ensure that the mixer performs its mixing function fully within the appropriate volume, typically determined by flow rate. According to the different process requirements of wastewater treatment plants, the flow rate of the mixer should be maintained between 0.15~0.3 m/s. A flow rate below 0.15 m/s will not achieve the desired push flow mixing effect, while a flow rate above 0.3 m/s will affect the process efficiency and result in waste. Therefore, before selecting, it's crucial to first determine the application site of the submersible mixer, such as: wastewater pond, sludge pond, biochemical pond; followed by the medium parameters, such as: suspended solids content, viscosity, temperature, pH value; and also the pool shape and water depth.
The required matching power for a mixer is determined by the volume size, the density of the mixing liquid, and the mixing depth. A single or multiple mixers are used based on the specific circumstances.
Blended Mixing Type:
1. Determine the sludge correction factor for the medium to be mixed based on Figure B1 or Table B1.
2. Determine the mixing tank type correction coefficient based on Figure B2 or Table B2.
3. Multiply the required energy consumption of 5 w per cubic meter of clean water by the sludge correction factor, then by the tank type correction factor, to obtain the actual energy consumption required per cubic meter for the mixture to be blended. Multiply this by the volume of the mixture to be blended, resulting in the total power required for the entire tank's mixture to be blended.
Low-speed Turbulence-Generating Type
1. Determine the tank type correction coefficient for the mixing tank based on Figure B1 or Table B1.
2. Determine the sludge correction factor for the medium to be mixed based on Figure B2 or Table B2.
3. Determine the unit flow power consumption based on the initial flow velocity y of the mixing medium, as shown in Figure B3.
4. Calculate the blender's flow rate by multiplying the initial flow velocity of the mixing medium (y) by the cross-sectional area formed by the impeller's rotation.
5. Multiply the flow rate of the mixer by the power consumption per unit flow, then multiply by the sludge correction factor and the tank type correction factor to obtain the total power required for the entire tank medium.
Operating Conditions:
Compared to traditional vertical mixers, vertical mixers have a limited service range. For pools with large water volume and a wide aspect ratio, multiple vertical mixers are required to achieve proper mixing. However, the QJB type submersible mixer typically requires only 1-2 units to achieve the desired mixing effect. For outdoor large pools, vertical mixers need to be mounted on a bridge structure for installation, whereas submersible mixers do not.
The advantages of the QJB type submersible mixer lie in its ability to generate various flow directions. Different installation positions of the mixer can result in various flow patterns, thus creating better flow effects in the pool and eliminating dead mixing zones. The required配套 power for the submersible mixer is determined by the pool volume, medium density, viscosity, and mixing medium depth, among other factors. Depending on the specific situation, one or more mixers should be selected.
To ensure energy-saving operation of the submersible agitator in different pool types, refer to the following typical installation forms.
