Selecting a submersible mixer is a relatively 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 operates at full stirring capacity within an appropriate volume, usually determined by flow rate.
Usage:
QJB TypeSubmersible mixerIt 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 impeller mixers are suitable for industrial and urban wastewater treatment plant aeration tanks, generating strong water currents with low tangential flow, which can be used to create water currents for circulation, nitrification, denitrification, and phosphorus removal stages.
FQJB Type Buoyant BuoyDiving Impeller
The FQJB-type Submerged Propeller Mixer is a modified version of the Submerged Propeller Mixer, constructed with stainless steel buoyant floats. The specific model selection is implemented according to the QJB-type Submerged Propeller Mixer.
Application Scope:
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 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. Steel expansion bolts must be securely fastened according to specifications, and the cables must be tightened and securely fastened after installation.
All propellers of the diving flow driver are made of polyurethane material, equipped with a helical 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-swept blades that have self-cleaning capabilities, preventing debris entanglement and blockage.
3. Mixing with an aeration system can significantly reduce energy consumption, improve oxygenation, and effectively prevent sedimentation.
4. Motor winding insulation level: F class, 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 mechanical seals are sealed with silicon carbide material, and the rubber material is fluoro rubber.
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 conditions.
Installation Method and Dimensions
Submersible mixerMultiple installation methods are available. Here, we offer more universal options for selection. Dimensions can be referred to 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 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 floatation筒s. The FQJB type submersible mixer with floatation筒s is a modified version of the standard submersible mixer, featuring stainless steel floatation筒s. It is primarily suitable for locations with uneven, solid pool floors where bridge structures cannot be easily installed. Specifically designed for wastewater treatment plants, it is used for treatment without discharge modifications or river treatment.
Selection Considerations:
Selecting a submersible mixer is a complex task, as the correctness of the selection directly impacts the normal operation of the equipment. The principle of selection is to ensure that the mixer performs its mixing function fully 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 a mixer is determined by the volume size, the density of the mixing liquid, and the mixing depth. A single mixer or multiple mixers are used based on the specific circumstances.
Mixed Blender 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 power consumption per cubic meter of fresh water by 5W, then by the sludge correction factor, and finally by the tank type correction factor to obtain the actual power consumption required per cubic meter of the medium to be mixed and agitated. Multiply this by the volume of the medium to be mixed, and you get the total power required for the entire tank's mixed and agitated medium.
Low-speed Turbulent Flow 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 mixed based on Figure B2 or Table B2.
3. Determine the unit flow power consumption based on the initial flow velocity y of the stirring medium, as shown in 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's 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 required to achieve mixing effects. However, the QJB type submersible mixer typically needs only 1-2 units to achieve the desired mixing results. For outdoor large pools, a bridge frame must be established for the installation of vertical mixers, whereas 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 by factors such as pool volume, medium density, viscosity, and mixing medium depth. Depending on the specific situation, select one or more mixers.
To ensure energy-saving operation of the submersible mixer in different pool types, refer to the following typical installation forms.
