Selecting a submersible mixer is a relatively complex task. The correctness of the selection directly affects the normal operation of the equipment. The principle of selection should be to ensure the mixer performs its mixing function fully within an appropriate volume, usually determined by flow rate.
Usage:
QJB TypeSubmersible mixerIt can be divided into two major 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 flow-through mixers are suitable for industrial and urban wastewater treatment plant aeration basins, producing a strong water flow with low tangential velocity, which can be used to create water currents for circulation, nitrification, denitrification, and phosphorus removal stages.
FQJB Type Buoyant BuoyDiving Agitator
The FQJB type submersible mixing pump is a modified version of the standard submersible mixing pump, constructed with stainless steel floats. The specific model selection is based on the QJB type submersible mixing pump.
Application Scope:
The blender should be capable of continuous, normal operation 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 underwater operation, with a diving depth generally not exceeding 20 meters.
Key Points of Attention:
Submersible mixers must be fully submerged in water during 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, 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-tilted 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, improves oxygenation levels, and effectively prevents sedimentation.
4. Motor winding insulation grade F, protection grade IP68, equipped with NSK/SKF bearings, motor available with anti-condensation device option, utilizing over-temperature protection to ensure greater reliability in motor operation.
5. Two mechanical seals; the mechanical seals are sealed with silicon carbide material, and the rubber material is fluoroelastomer.
Model Representation Method:
Performance Parameters of Submersible Mixers:
The blender operates at a rated voltage of 380V, frequency of 50Hz, with a F-grade insulation winding, IP68 protection rating, under working mode Ⅰ.
Installation Method and Dimensions
Submersible agitatorThere are various installation options available. Here, we offer more universal 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 accelerator dimensions
Installation System & Dimensions
Submersible mixers can be installed in various ways. Below are several of the most commonly used methods, with others available upon request. These installations allow for quick assembly and disassembly of the submersible mixers without the need to drain the pool's wastewater, ensuring both safety and reliability.
FQJB Type Buoyant Submerged Mixing Pump Installation Site
Submersible mixers can also be installed with buoyant floats. The FQJB type buoyant submersible mixer is a modified version of the standard submersible mixer, featuring stainless steel floats. It is primarily suitable for locations where the pool bottom is not solid or flat, and it is also not convenient to install bridge structures. It is specifically used in wastewater treatment plants for treatment without discharge, as well as for river water 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 for selection is to ensure the mixer performs full mixing capabilities within the appropriate volume, generally determined by flow rate. According to different process requirements of wastewater treatment plants, the mixer's flow rate should be maintained between 0.15~0.3 m/s. Flow rates below 0.15 m/s will not achieve proper push flow mixing, while rates above 0.3 m/s will affect process efficiency and lead to waste. Therefore, before selecting, it's essential to first determine the application of the submersible mixer, such as in wastewater, sludge, or biochemical pools; secondly, consider the medium parameters like suspended solids content, viscosity, temperature, and pH; and finally, the pool's shape and depth.
The required配套power for the mixer is determined by the volume, the density of the mixing liquid, and the mixing depth, with a single or multiple mixers used based on the specific circumstances.
Hybrid 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 model correction factor according to Figure B2 or Table B2.
3. Multiply the energy consumption per cubic meter of clean water by 5W, then by the sludge correction factor, and finally by the tank type correction factor to obtain the actual energy consumption required per cubic meter of the medium to be mixed. Multiply this by the volume of the medium to be mixed, and you get the total power required for mixing the entire tank's medium.
Low-speed flow promotion 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 agitated 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 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 proper mixing. However, the QJB submersible mixer typically requires only 1-2 units to achieve the desired mixing effect. For open-air large pools, a bridge structure must be established for vertical mixers to be installed, 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 varying installation positions of the mixer, multiple flow patterns can be achieved, thus creating better flow effects in the pool and eliminating dead mixing zones. The required matching power for the submersible mixer is determined based on the 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.
