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 the mixer performs full mixing functions within an appropriate volume, usually determined by flow rate.
Application:
QJB TypeDiving AgitatorIt can be divided into two main series: mixed agitation and low-speed plug flow.
The Mixed Series Agitators are 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 tanks, generating a strong 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 BuoySubmersible mixer
The FQJB Type Submerged Impeller Mixer is a modified version of the standard submerged impeller mixer, constructed with a stainless steel buoyant buoy. Specific models are selected in accordance with the QJB Type Submerged Impeller Mixer.
Application Range:
The mixer should be able to run continuously under the following conditions:
Medium temperature not exceeding 40°C.
2. The medium's pH value is between 5~9.
3. Liquid density not exceeding 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. The steel expansion bolts must be securely fastened according to specifications, and the cables must be tightened and securely fastened after installation.
All propellers for the submersible flow controllers are made of polyurethane material and equipped with a helical gearbox 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 swept-back blades that have self-cleaning capabilities, preventing debris entanglement and blockage.
3. When used in conjunction with an aeration system, it significantly reduces energy consumption, increases oxygenation levels, and effectively prevents sedimentation.
4. Motor winding insulation: F-grade, protection rating: IP68, equipped with NSK/SKF bearings. The motor is available with a condensation prevention device. It 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 rated voltage 380V, frequency 50Hz, F-grade winding insulation, IP68 protection rating, and under working mode Ⅰ.
Installation Methods and Dimensions
Diving MixersMultiple installation methods are available. Here, we offer more universal options for selection. Dimensions can be referenced 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 several of the more common methods, with others also available upon request. These installations allow for quick disassembly and assembly of the submersible mixers without the need to drain the pool's wastewater, ensuring both speed and safety.
FQJB Type Buoyant Submerged Impeller Mixer 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-solid pool bottoms and where bridge structures are not feasible. It is specifically designed for wastewater treatment plants, and is used for the treatment of wastewater without discharge into modifications or rivers.
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, usually determined by flow rate. According to the different process requirements of wastewater treatment plants, the mixer flow rate 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 lead to waste. Therefore, before selecting, it is 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 shape and depth of the pond.
The required matching power for the agitator is determined by the volume, the density of the agitation fluid, and the depth of agitation. One or more agitators are selected based on the specific circumstances.
Mixed Stirring 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 according to Figure B2 or Table B2.
3. Multiply the power consumption per cubic meter of fresh water by 5 W, then by the sludge correction factor, and finally by the tank type correction factor to obtain the actual power consumption required per cubic meter for the mixture to be blended. Multiply this by the volume of the mixture to be blended, and you get the total power required for blending the entire tank's mixture.
Low-speed Turbulence-Generating Type
1. Determine the mixing tank type correction factor based on Figure B1 or Table B1.
2. Determine the sludge correction factor for the medium to be agitated based on Figure B2 or Table B2.
3. Based on the initial flow velocity of the mixing medium y, determine the unit flow work consumption through Figure B3.
4. Calculate the flow rate of the agitator by multiplying the initial flow velocity of the stirring medium (y) by the cross-sectional area formed by the impeller rotation.
5. Multiply the flow rate of the mixer by the power consumption per unit flow, then by the sludge correction factor and the pond type correction factor to obtain the total power required for the entire pond medium.
Operating Conditions:
Compared to traditional vertical mixers, vertical mixers have a limited service range. For pools with large water volume and a high width-to-length ratio, multiple vertical mixers are needed to achieve mixing effects. However, the QJB type submersible mixer usually requires only 1-2 units to achieve the desired mixing results. For open-air large pools, a bridge framework must be established for vertical mixers to be installed, while submersible mixers do not require this.
The QJB type submersible mixer's advantage lies in its ability to generate different flow directions. Due to the different installation positions of the mixer, various flow patterns can be achieved, thereby creating better flow effects in the pool and eliminating dead mixing zones. The required配套 power for the submersible mixer is determined based on the pool volume, medium density, viscosity, and depth of the mixing medium. Depending on the specific situation, select one or more mixers.
To ensure energy-efficient operation of the submersible mixer in different pool types, refer to the following typical installation forms.
