Monthly Archives: November 2020

Operating Factors of Sewage Horizontal Screw Centrifuge

Horizontal screw pushing sedimentation centrifuge is referred to as horizontal screw centrifuge, which has been widely used in sludge dewatering treatment of sewage treatment plant. Although different manufacturers of different specifications or models of horizontal screw centrifuges have different equipment structure, equipment material, specifications and operation adjustment mechanism, but

Its basic equipment principle is similar, now carries on the brief introduction to it, in order to facilitate the field user to use and adjust better.

The horizontal screw centrifuge is mainly composed of drum, spiral, differential system, liquid level baffle, drive system and control system.

The horizontal screw centrifuge uses the density difference of solid-liquid two-phase to the settling speed of solid particles under the action of centrifugal force to realize solid-liquid separation. The process of separation is that the sludge and flocculant solution are fed into the mixing chamber through the inlet pipe, where the mixed flocculation is carried out (if the sludge pump is added before or after the pump, the flocculation reaction is advanced). The sludge is accelerated and formed a cylindrical liquid ring layer (liquid ring area) inside the rotor due to the high speed rotation and friction resistance of the rotor (spiral and drum). Under the action of centrifugal force, the specific gravity solid particles settle to the inner wall of the drum to form a mud layer (solid ring layer), and then use the screw and drum to form a mud layer (solid ring layer). The The relative velocity difference of the drum pushes the solid phase to the cone end of the drum. After the liquid level is pushed out (shore area or dry area), the mud slag can be dehydrated and dried, and the supernatant is discharged from the large end of the drum to realize the separation of solid and liquid.

The effect of the mechanical part of the horizontal screw centrifuge is divided into adjustable factors and non-adjustable factors. It can be effectively controlled in use.

How to Distinguish Sedimentation Centrifuge from Filter Centrifuge?

Settlement is the centrifuge drum installed at the upper end of the shaft, through the transmission driven by the motor and high-speed rotation. There is a set of disc parts in the drum, the disc. There is a small gap between the disc and the disc. The suspension is attended by a feeding tube located in the center of the drum. When the suspension passes through the gap between the discs, the solid particles sink to the disc by centrifuge to form sediment.

The sediment slips along the surface of the disc and leaves the disc and accumulates in the largest diameter of the drum. The separated liquid is discharged from the outlet. The function of the disc is to shorten the settling interval of solid particles and expand the settling area of the drum, which greatly improves the production capacity of the separator because of the installation of the disc. The solid accumulated in the drum is removed by manual removal after the separator stops, or discharged from the drum without stopping.

There are the following points in the settlement centrifuge, which is different from the filter centrifuge:

The settling centrifuge equipment is turned into a closed barrel. The working principle of the equipment is to separate the solid-liquid two-phase through centrifugal force. The centrifuge of this method is called the settling centrifuge. The sedimentation centrifuge is suitable for a wide range of materials, such as high viscosity of materials and small solid particles, which can meet the requirements of solid-liquid two-phase separation by increasing centrifugal force.

Filter centrifuge equipment drum hole, additional filter media through the method of blocking solid-liquid two-phase separation centrifuge we call filter centrifuge, Filter centrifuge is suitable for small viscosity of materials, solid particles are not easy to deform (such as crystal) solid particles large and small batch production conditions, mostly used for industrial dehydration.

The sedimentation centrifuge can complete two kinds of operations: liquid-solid separation, called clarification operation; liquid-liquid separation, called separation operation. Disc separator is widely used in chemical industry, medicine, light industry, food, bioengineering and transportation because of its compact structure, small area and large producti

Brief Introduction on Treatment of Oily Sludge

What is the price of oily sludge treatment technology equipment? Because the oily sludge composition in each area is different, the solution is different. The price is also different, now our country attaches great importance to environmental protection, decades ago buried oily sludge has also been dug to solve, this kind of oily sludge solution is not the same, the price is not the same. General oily sludge treatment technology equipment manufacturers to solve a ton of oily sludge in 200-300 yuan. In the second half of this year, more and more companies intervene in oily sludge solution, and the price relativity is also reduced.

Technical methods are generally as follows:

  1. Automatic feeding: The single bucket sludge bucket lifting machine with unique design scheme is used to consider the transportation of liquid, solid and semi-solid oily sludge, and then the oily sludge is sent immediately from the oily sludge tank to the moving pretreatment equipment to consider continuous feeding. And the bucket lift machine raw material entrance place sets up the junior middle school level pick miscellaneous net slot, can avoid the ribbon, the stick and so on block dirty matter enters the solution system software.
  2. Pretreatment: Oily Sludge in Oily Sludge Treatment Technical Equipment According to the interaction between Sludge Sorting Runner and Grate Plate, the sludge of block coalescer is scattered according to the rotation of Sludge Sorting Runner, and more than 20 mm of sludge is pushed into the bulk raw material collection box on one side of the pretreatment equipment by the Sorting Runner. Sludge less than 20 mm is sifted into the sludge pretreatment tank according to the round hole of the Sorting grate plate. According to the mutual effect of oily sludge sorting runner and grate plate, the sludge removal, chemical fiber crushing, symmetrical dispersion, oil slurry storage and transportation are completed.
  3. Cleaning: In the oily sludge level II level III cleaning equipment. According to the efficacy of medicine, ultrasonic wave, air floatation machine, mixing and so on, the oily sludge is collected, cleaned and dispersed oil is removed.
  4. Solid-liquid separation equipment: high-efficiency environmental protection and energy-saving pig manure dehydrator to complete the separation of solid sludge and liquid.
  5. Water and oil solution: oil-bearing sludge treatment technology equipment manufacturers according to the three-level cleaning equipment collected floating oil to the oil storage tank, oil storage tank for precipitation of water can be transported to the storage tank. According to the liquid extracted by high efficiency, environmental protection and energy saving pig manure dehydrator into the water storage tank, the floating oil in the water storage tank can be collected and typed into the oil storage tank, and the boiling water can be reused as a return water.

Operating Procedures for Vertical Scraper Centrifuge

Scraper centrifuge is a continuous operation, intermittent operation of filter centrifuge, its control mode is automatic control, but also manual control. the feeding, separation, washing, dehydration, unloading and filter cloth regeneration processes during the operation of the centrifuge are generally completed at full speed. the single cycle time is short capacity is large, and the dry filter slag and good washing effect can be obtained.

Is a continuous operation, intermittent operation of the filter centrifuge, its control mode for automatic control, but also manual control. the feeding, separation, washing, dehydration, unloading and filter cloth regeneration processes during the operation of the centrifuge are generally completed at full speed. the single cycle time is short capacity is large, and the dry filter slag and good washing effect can be obtained.

I. Working principles

The main working principle of centrifuge is to produce centrifugal force to realize solid-liquid separation, which is composed of feed, washing, liquid discharge and so on.

II. Preparation before boot

1. Open the door cover and check for screw loosening, especially spindle.

2. hydraulic station oil level should be station should be more than 2/3 of the oil standard thermometer label YB-N46.

The main pressure working pressure of 3. gas control box should be more than 4㎏, the explosion-proof pneumatic valve (feeding valve, cleaning valve) can be opened reliably, and the cylinder pressure of material level detection is 2.5~4㎏.

III. Boot

  1. Before boot, make sure the cover is closed and all screws are tightened.

2. first press the feeding speed button, after the speed (speed read from the tachometer) arrived, press the feeding speed on / off, the feeding indicator light.

3. open the feed valve, start feeding at this time, when the material is full, the feeding indicator lights out.

4. if the machine vibration is small, can open separation speed, if the vibration is large, open cleaning speed, and pay attention to observation, if the vibration is serious, please reduce to the feeding speed.

5. according to the properties of the separation material, nitrogen gas should be filled if necessary to prevent the separation and scraping of.

6. depending on the production process, determine the separation time, after the separation, press the scraping speed button.

  • After the reaches the scraper, press the discharge button.

8. scraper, scraper rotation > scraper drop > scraper rise, scraper rotation two > scraper drop > scraper rise, scraper reset, scraper end.

9. when feeding and discharging, the operator shall not leave the post. When feeding, mainly observe the vibration of the machine, outlet, discharge, discharge, mainly check whether the outlet is blocked, motor speed is normal. 10. When the machine is running normally, if there are no special circumstances, please do not press the emergency stop button, especially when running at high speed; if pressed, all the work of the equipment will stop.

IV. Automatic operation (selection function)

1. After manual normal, input the relevant data into the man-machine interface (select accessories).

  • If an exception occurs during 2. operation, cut back to manual operation until troubleshooting.
  • Fault handling method is similar to manual.
  • If the vibration is too large in 4. operation, the machine will stop automatically and cut back to manual processing.

V. Shutdown inspection

1. the opening cover must wait for the centrifuge to stop completely, confirm that the screw and hook have been unloaded, the material level detection limit switch indicator light can be opened, can press the open cover button, when the cover and drum 95 degrees, insert the safety pin. If not, check the compressed air pressure to ensure that the level detection plate is not in the position to open the door cover safely. Similarly, the probe board should not be in the probe position when closing the cover.

2. If want to work in the machine, press the emergency stop button after opening the cover.

3. centrifuge running speed is high, rotation inertia is large, operators must always pay attention to safety, to ensure the safety of personnel and equipment.

4. Clean and replace the filter cloth before work or as appropriate, clean up the material above the hopper, material exploration, etc., and remove the material from the liquid outlet.

5. to check the drum weld, fence, shell parts corrosion, timely reporting.