Year1
- 型号：
- LWY350
- 功率：
- 15kw
- 处理量：
- 10方每小时
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Lanxi Yongfeng Machinery Co., Ltd. provides you with bauxite sewage treatment equipment including centrifugal bauxite sludge dehydrator. Bauxite sewage treatment equipment includes centrifugal bauxite sludge dewatering machine
As the country attaches great importance to environmental protection issues, the application of centrifuge technology in sludge treatment systems has also been vigorously promoted. Centrifuge processing sludge has the advantages of high sludge recovery rate and reliable operation, but it also has the disadvantages of high energy consumption and loud noise. Applying frequency conversion technology to centrifuge systems may achieve significant results in energy saving, emission reduction, and stable operation.
Working principle of centrifuge
The centrifugal dehydrator used for sludge treatment is mainly composed of drum, spiral body, differential, main and auxiliary motors and other equipment. When the sewage is fed into the drum after dosing, under the action of centrifugal force generated by the high-speed rotation of the drum, solid particles with larger specific gravity are deposited on the inner wall of the drum, and the spirals that move relative to the drum continue to deposit on the inner wall of the drum. The solid particles on the inner wall are squeezed out of the slag discharge port, and the separated clear liquid flows out of the drum through the opening of the liquid layer regulating plate.
Double frequency conversion common DC bus system
The relative motion differential speed between the spiral body and the drum is realized through the differential, and its size is controlled by the auxiliary motor. The housing of the differential is connected to the rotating drum, the output shaft is connected to the spiral body, and the input shaft is connected to the auxiliary motor. The main motor drives the rotation of the drum and also drives the rotation of the differential housing. The auxiliary motor controls the rotation of the differential input shaft through the connection of the coupling
If the rotation speed is fast and the spiral speed is slow, then the drum There is a force that drives the spiral body to rotate, and the spiral body drives the auxiliary motor to rotate. This results in that when the auxiliary motor is connected to the power grid and running, its shaft receives the driving torque of the main engine, causing the rotor to rotate in the synchronous speed direction. At this time, the auxiliary machine inputs mechanical power from the shaft and converts it into electrical power and returns it to the power grid. It is in the state of regenerative braking and power generation. On the other hand, it inputs lagging reactive power from the power grid, establishes a magnetic field, and realizes electromechanical energy conversion. The active component of the rotor current fed back to the power grid is added to the DC bus through the full-wave rectifier element in the frequency converter. Since the busbars of the main and auxiliary frequency converters are connected in parallel, this energy is used by the main motor to maintain the bus voltage within the range.
Control system
Incoming sludge flow control
Because sludge is compressible, the solid content of the incoming sludge changes all the time. In order to prevent the accumulation of sludge and blockage and stop the operation, it is necessary to Pay attention to the torque control of the spiral body.
The auxiliary frequency converter automatically and continuously measures the torque value of the spiral body, sends the new torque analog value to the analog module, compares the actual measured value with the set value, and after calculation, the output signal is used to control the feed frequency conversion By changing the output frequency of the frequency converter, the mud feeding amount of the feed pump is controlled to achieve constant torque control of the spiral body.
Differential speed control
The differential speed is the relative speed between the drum and the spiral body. The greater the differential speed, the mud lumps settled on the inner wall of the drum will be quickly discharged from the mud outlet of the drum, that is, push The faster the material speed difference is, the smaller the rotation speed is and the slower the material pushing speed is.
The differential rotational speed affects both the moisture content of the mud cake and the turbidity of the discharged water. Generally speaking, when the differential rotational speed becomes smaller, the moisture content of the mudcake will become lower, and the discharged water will become turbid. When the differential rotational speed increases, , the moisture content of the mud cake will become higher and the discharge water will be clearer.
From several aspects of analysis, it can be seen that in order to make the centrifuge separation effect good and stable, the differential speed is required to be adjustable within a certain range and remain stable.
And because the main motor is generally not adjusted during operation, it is mainly an indicator of separation factors, and one type of sludge generally corresponds to one separation factor.
Therefore, since the drum speed and differential gear ratio are generally fixed, it is only necessary to adjust the output frequency of the auxiliary machine inverter to adjust the differential speed.
Conclusion
When used in centrifuges with variable frequency technology, it has the following main advantages
) Smooth start. The frequency converter has the function of a soft starter, achieving smooth start of the motor and extending the use of the machine. life.
) It has a wide range of applications, especially the host frequency converter. Due to the different mud properties of various sludges, the required separation factors are also different, which requires different host speeds. The separation can be easily adjusted through the frequency converter. factor.
) The auxiliary engine controls the differential through a frequency converter, which has obvious energy-saving effects and fast dynamic response compared to previously commonly used eddy current braking and other equipment.
Bauxite sludge dehydration equipment manufacturer supplies
The equipment occupies a small area, has low maintenance rate, can operate continuously and automatically, meets environmental protection standards, and purifies sewage
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In regular script_ Company name Lanxi Yongfeng Machinery Co., Ltd.
In regular script_ Contact person
In regular script_ Xu Gaofeng
In regular script_ Contact number
In regular script_
In regular script_ Contact
KaiTi_
KaiTi_ Address Next to the National Highway, Yongchang Industrial Park, Lanxi City, Zhejiang Province
KaiTi_ (formerly Qixing Machinery, the navigation can be directly directed to Lanxi Yongfeng Machinery Co., Ltd.)
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