Selecting a submersible mixer can be a complex task; the correctness of the selection directly affects the normal operation of the equipment. The principle for selection is to ensure the mixer performs its mixing function fully within an appropriate volume, usually determined by flow rate.
Usage:
QJB ModelSubmersible mixerIt can be divided into two main series: mixed agitation and low-speed plug flow.
The Mixed Series Agitator is suitable for mixing suspended liquid in wastewater treatment plants and industrial processes.
Low-speed Turbulator Series Mixers are suitable for industrial and urban wastewater treatment plant aeration basins, generating a powerful water flow with low tangential velocity, which can be used to create water currents for circulation and stages such as nitrification, denitrification, and phosphorus removal.
FQJB Type Buoyant FloatSubmersible mixer
The FQJB type buoyant submersible mixer is a modified version of the submersible mixer, incorporating stainless steel buoyant floats. The specific model selection is implemented according to the QJB type submersible mixer.
Application Range:
The mixer should be able to operate continuously under the following conditions:
1. Medium temperature not to exceed 40°C.
2. The medium's pH level is between 5~9.
3. Liquid density not exceeding 1150 kg/m³.
4. Long-term diving operations, with a diving depth generally not exceeding 20 meters.
Key Points of Attention:
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 securely fastened after installation.
Propellers of the submersible flow director are all made of polyurethane, equipped with a helical gear box reducer.
Performance Features:
1. Compact structure, easy operation and maintenance, convenient installation and inspection, and long service life.
2. The impeller features a rational hydraulic design structure, with backward-tilted blades that have self-cleaning capabilities, preventing debris entanglement and blockage.
3. When used in combination with an aeration system, it significantly reduces energy consumption, improves oxygenation, and effectively prevents sedimentation.
4. Motor winding insulation grade F, protection grade IP68, equipped with NSK/SKF bearings. The motor is optional with a condensation prevention device. The motor utilizes an over-temperature protection system for enhanced reliability.
5. Two mechanical seals; the seals are made of silicon carbide for sealing, with fluoroelastomer as the rubber material.
Model Representation Method:
Performance Parameters of Submersible Mixers:
The mixer operates at a rated voltage of 380V, frequency of 50Hz, with a F-grade winding insulation and IP68 protection rating, under working mode I.
Installation Method and Dimensions
Diving mixerMultiple installation options are available. Here, we offer more versatile methods for selection, with dimensions listed in the table below. Our company can also customize special designs according to customer requirements.
Submersible mixer, submersible flow driver 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 mixers without draining the pond's wastewater, ensuring both speed and safety.
FQJB Type Buoyant Submerged 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 where there is no firm, level pool bottom and it is inconvenient to set up bridge structures. It is specifically designed for wastewater treatment plants, without discharge of modified wastewater into rivers or canals.
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 full mixing functions within an 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 cause waste. Therefore, before selecting, first determine the application site of the submersible mixer, such as: sewage pool, sludge pool, biochemical pool; next, consider the medium parameters, such as: suspended solids content, viscosity, temperature, pH value; and also the pool shape and water depth.
The required配套power for the blender is determined by the volume size, the density of the blending liquid, and the blending depth. A single blender or multiple blenders are used based on the specific circumstances.
Hybrid Blender Type:
1. Determine the sludge correction factor for the medium to be agitated based on Figure B1 or Table B1.
2. Determine the mixing tank type correction coefficient according to Figure B2 or Table B2.
3. Multiply the required power of 5 W per cubic meter of clear water by the sludge correction factor and then by the pond type correction factor to obtain the actual power required per cubic meter of the mixture to be agitated. Multiply this by the volume of the mixture to be agitated, and you get the total power required for the entire pond's mixture to be agitated.
Low-speed Turbulence Generator
1. Determine the mixing tank type correction factor according to 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 work consumed per unit flow based on the initial flow velocity y of the mixing medium, as indicated in Figure B3.
4. Calculate the flow rate of the agitator by multiplying the initial flow rate 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 by the sludge correction factor and pond type correction factor, to obtain the total power required for the entire pond medium.
Operating Conditions:
Compared to traditional vertical mixers, the service range of vertical mixers is limited. For pools with large water volume and a high ratio of length to width, multiple vertical mixers are needed to achieve effective 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 installed on a bridge structure, whereas submersible mixers do not.
The QJB submersible mixer's advantage lies in its ability to generate various flow directions. Due to different installation positions of the mixer, multiple flow patterns can be achieved, thereby creating a better flow effect 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, and based on the specific situation, one or more mixers are selected.
To ensure energy-saving operation of the submersible mixer in various pool types, refer to the following typical installation configurations.
