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What is the difference between a filter press and a decanter centrifuge?

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What is the difference between a filter press and a decanter centrifuge?

 

  According to years of design experience and surveys on the users of the decanter centrifuge, the following is the analysis of the actual use of the decanter centrifuge:

   1. Applicable medium problem

   Decanter centrifuge is not suitable for all kinds of sludge. After investigation, the decanter centrifuge is not suitable for the sludge containing more inorganic components such as fly ash. Because the fly ash is centrifuged, it is difficult to remove the fly ash attached to the inner wall of the decanter centrifuge. There is a lot of resistance, and the mud cannot come out after it gets in. This situation occurred in a sewage treatment plant in a city in northern my country. The decanter centrifuge was unable to operate normally and had to be changed to a large loss.

   2. The control problem of entering the department

   Decanter centrifuge can automatically adjust the slip and torque according to the change of the feed concentration. Manual adjustment is required. In fact, the change of the feed concentration has a greater impact on the decanter centrifuge, but the impact on it is small.

  3. The problem of solid recovery rate and dosage

   The solid recovery rate of the decanter centrifuge is indeed relatively high, but this does not mean that the low solid recovery rate cannot be used. In fact, the filtering has to be returned to the front and processed from the beginning together with the sewage treatment plant.

The dosage of medicament is controversial. Manufacturers will also say that their dosage of medicament is also small. A certain 15×104t/d urban sewage treatment plant designed by a certain manufacturer uses a decanter centrifuge to dewater. After production, the measured PAM consumption per ton of dry sludge is 1.7-2.0kg, which is relatively low. According to the data, a wastewater treatment plant in Shanghai has also conducted a dehydration drug consumption test, and the amount of chemicals per ton of dry sludge in urban sewage is also about 20kg. Due to the different nature of sludge from various plants, it is difficult to say how much higher the chemical consumption is than the decanter centrifuge.

By the way, please check the following products of GN company on Alibaba:

Decanter centrifuge

3-Phase Disc centrifuge

Sludge dewatering Screw press

Oil water separator

Centrifugal pump

Vacuum Pump

Submersible pump

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What are the characteristics of a three-phase disc centrifuge?

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What are the characteristics of a three-phase disc centrifuge?

   Looking at it now, the price of domestic three-phase disc centrifuges is not very large, and in terms of performance, it is true that domestic equipment is more cost-effective, and it is also suitable in terms of practicality. And the production capacity of many domestic manufacturers is good, they have mastered the important technology of centrifuge, so the price difference will not be very big. If we want to purchase, then we must first confirm the quotation status of different merchants, so that we can also purchase suitable equipment. So what are the characteristics of the three-phase disc centrifuge?

   1. Use safety protection devices

  The use of safety protection device makes the rotating body of the equipment not separated from the motor conjoined body during high-speed rotation. This design is very clever and is very helpful for the smooth work of the machine.

  2. One time investment, no worries afterwards

   Different from other equipment, the subsequent protection of this type of equipment is very convenient and requires limited consumables.

  3, the oil is clear and the purity is good

   The three-phase disc centrifuge adopts a centrifugal extractor, which saves time and electricity, has good oil output, good oil quality, clear color and high purity, and can be sold directly after production without other processing.

 

  4, fast refining speed

        The three-phase disc centrifuge not only integrates heating, vacuum extraction, and centrifugal extraction, but also increases automation. When a certain degree of oil residue is reached, it will automatically clean up, saving time and effort.

  5, save power than ordinary machines

   The three-phase disc centrifuge is not always powered. After the power is turned on, when the drum reaches the normal speed, it will be powered off and work by the centrifugal force of the drum.

 

Of course, we also need to be clear about the differences in the three-phase disc centrifuge host, because the price of refrigerated equipment is much higher than that of general equipment, and some centrifuges can provide heating services, so on the whole The price is also slightly higher. Therefore, it is necessary for us to make purchases according to the equipment and our detailed needs, so that we can select suitable products and ensure a higher cost performance.

Please check the following products of GN company on Alibaba:

Decanter centrifuge

3-Phase Disc centrifuge

Sludge dewatering Screw press

Oil water separator

Centrifugal pump

Vacuum Pump

Submersible pump

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What to do with the inversion of decanter centrifuge

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What to do with the inversion of decanter centrifuge

1. The inversion of the decanter centrifuge, as the name implies, refers to the rotation in the counterclockwise direction. Although the decanter centrifuge can still play a certain dehydration effect under the inversion condition, it is easy to cause shock absorption springs, capacitors and other components in the long run. damage. So we should deal with it in time.

2. The method of investigating whether the decanter centrifuge is reversed is very simple, we only need to investigate whether its working direction is the same as the direction of the rotation arrow marked on the outer cylinder. From the perspective of long-term maintenance service experience, the reverse transmission failure of the decanter centrifuge is mostly caused by problems with the motor, capacitor, and clutch components. We can use the cleaning method to clean up the specific treatment.

3. Regarding the motor, we can open the back cover of the decanter centrifuge and check the power supply. If the motor is idling when the motor is rotating, the belt should be loose, and it can be tightened or replaced. On the contrary, if the motor does not rotate in the forward direction, only the hum of the motor is heard. If the power fails, remove the belt and try again. The possibility that the problem of non-rotation lies in the capacitor or motor, capacitor and winding is very small.

4. Regarding the capacitor, on the premise that the motor has no fault, we can replace the capacitor with the same capacity, and then test the work after power on. If the fault still exists, then please check the normality of the clutch. We can check the tension in the clutch gear. Whether the separating hook on the spring and gear is still in the normal position, then adjust and replace according to the actual situation.

5. After the above-mentioned overhaul and adjustment of the three components of the motor, capacitor and clutch, we can effectively solve the problem of the reverse rotation of the scraper centrifuge. We also remind users that they must pay special attention to this problem when using the decanter centrifuge daily to ensure that its working direction is correct to prevent damage to components and safety accidents caused by inversion.

 

By the way, please check the following products of GN company on Alibaba:

Decanter centrifuge

3-Phase Disc centrifuge

Sludge dewatering Screw press

Oil water separator

Centrifugal pump

Vacuum Pump

Submersible pump

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The structure of the decanter centrifuge

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The structure of the decanter centrifuge

Decanter centrifuge is an equipment with low energy consumption, stable function and good separation effect. Widely used in the chemical, food, salt, mining, pharmaceutical and other industries (for the separation of dozens of materials, because of the successful application experience, you can communicate with technicians when selecting models to obtain more detailed materials). In the separation process, the feeding, dewatering, washing, unloading and other processes are continuously completed, and the production efficiency and automation are high. It is an advanced separation equipment.

  Because of its separation principle and structural characteristics, it is also highly specific to materials. Material analysis and corresponding experiments should be carried out when selecting models to confirm its applicability and separation function.

   The solid particles with a larger specific gravity of the decanter centrifuge are deposited on the inner wall of the drum. The decanter centrifuge is a kind of mud-water mixture that enters the drum through the feed pipe and the screw discharge port. Under the action of centrifugal force generated by the high-speed rotation of the host. The spiral blades moving relative to the drum continuously scrape the solid particles deposited on the inner wall of the drum and push them out of the slag discharge port, and the separated clear liquid flows out of the drum machine through the weir plate opening.

   The working principle of the decanter centrifuge is that the mud-water mixture enters the drum through the feed pipe and the screw discharge port. Under the action of the centrifugal force generated by the high-speed rotation of the main engine, solid particles with a larger specific gravity are deposited on the inner wall of the drum. Such machinery and equipment include horizontal spiral unloading and sedimentation centrifuges and vertical sedimentation centrifuges and so on.

The spiral blades of the decanter centrifuge and the rotating drum move relatively to each other to continuously scrape the solid particles deposited on the inner wall of the rotating drum and push them out of the slag discharge port. The separated clear liquid flows out of the drum through the opening of the weir plate. The relative movement between the screw and the drum is completed by the differential, the shell of the differential is connected with the drum, the output shaft is connected with the screw, and the input shaft is connected with the auxiliary motor. When the main motor rotates the drum, it also rotates the differential housing. Because the input shaft is connected to the auxiliary motor, the auxiliary motor generates a braking torque, and then drives the planetary gear to work according to the designed transmission connection, and press A certain proportion of contact transfers the torque to the screw, which completes the continuous separation of materials by the decanter centrifuge.

 

Please check the following products of GN company on Alibaba:

Decanter centrifuge,  3-Phase Disc centrifuge,  Sludge dewatering Screw press,

Oil water separator,  Centrifugal pump,  Vacuum Pump,  Submersible pump

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Status and skills of sludge treatment equipment

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Status and skills of sludge treatment equipment

  Oil sludge refers to the sludge that occurs in the production process of the oil field because of crude oil excavation, storage, gathering and transportation, processing, and crude oil production fluid treatment. It is known for containing crude oil or certain components in crude oil. Mainly divided into: ground sludge, clear tank sludge, flotation scum, etc.

Oil sludge generally has an oil content of 10-50% and a water content of 40-90%. In my country’s petrochemical industry, an average of 800,000 tons of tank bottom sludge and pool bottom sludge occur every year. Shengli Oilfield produces 100,000 tons of oily sludge every year. Above, Dagang Oilfield produces about 150,000 tons of oily sludge annually, and Henan Oilfield produces 5X104m3 of oily sludge annually. Oily sludge contains a large amount of benzene series, powders, and other substances. If the sludge treatment equipment is directly discharged, it will not only occupy a large amount of cultivated land, but also pollute the surrounding soil, water and air. The sludge also contains a large amount of Copper, zinc, chromium, mercury and other metals, salts, and hard-to-degrade hazardous substances such as PCBs, dioxins, and radionuclides. Now, sludge has been classified as hazardous waste by our country.

  The status quo and skills of sludge treatment equipment

   With the continuous excavation of petroleum resources, resources will become less and less, and the difficulty of excavation will become greater and greater, so various additives will continue to increase in the process of oil extraction. As a result, the components of the sludge are varied, and the sludge treatment equipment and processes will be changed accordingly. There are many varieties of sludge treatment equipment, processes and methods, all with their own characteristics.

By the way, you are welcome to visit GN products on Alibaba below:

Decanter centrifuge

3-Phase Disc centrifuge

Sludge dewatering Screw press

Oil water separator

Centrifugal pump

Vacuum Pump

Submersible pump

   The methods for sludge treatment equipment at home and abroad generally include incineration, biological treatment, hot scrubbing, solvent extraction, chemical demulsification, solid-liquid separation, etc. Although there are many methods for sludge treatment equipment, they have not been promoted due to disadvantages such as poor pertinence and high processing costs. It is difficult to achieve severe environmental protection requirements with a single process and skills. Therefore, the combined use of multiple sludge treatment equipment processes and methods is one of the development directions of the harmless treatment of sludge in the future.