Slurry Pump for Waste Water Treatment

• Customization: Available
• Max.Head: 80-110m
• Max.Capacity: >400 L/min
• Model NO.: FL
• Working Pressure: Middle Pressure Pump
• Influent Type of Impeller: Single Suction Pump
• Position of Pump Shaft: Vertical Pump
• Pump Casing Combined: Verticaljoint Surface Pump
• Mounting Height: Suction Centrifugal
• Impeller: Closed
• Usage: Pump, Pumps, Slurry Pump, Circulating Pump
• Trademark: FL
• Origin: China
• HS Code: 9202100091
• Production Capacity: 50000

Product Description

Product Description

A slurry pump is a mechanical device that utilizes centrifugal force (rotation of the pump impeller) to increase the energy of a solid liquid mixture medium, converting electrical energy into kinetic and potential energy of the medium. Mainly applicable to industries such as mining, power plants, dredging, metallurgy, chemical engineering, building materials, and petroleum.
Product Attributes

maximum flow	5400	Pump body material	high chromium alloy
maximum head	118	drive mode	Direct connection/side pull

working principle
Under the action of centrifugal force, the liquid is thrown from the center of the impeller to the outer edge and gains energy, leaving the outer edge of the impeller at high speed and entering the volute pump casing. In the snail shaped pump casing, the liquid slows down due to the gradual expansion of the flow channel, and converts some of its kinetic energy into static pressure energy. Finally, it flows into the discharge pipeline at a higher pressure and is sent to the required location. When the liquid flows from the center of the impeller to the outer edge, a certain vacuum is formed at the center of the impeller. Due to the pressure above the liquid level in the storage tank being greater than the pressure at the pump inlet, the liquid is continuously pressed into the impeller.

structure
The slurry pump transports a mixture of solid particles containing slag and water. But in principle, the slurry pump belongs to a type of centrifugal pump, which is mainly used in steel enterprises for slurry transportation in systems such as converter dust removal water, blast furnace gas washing water, continuous casting turbid circulating water, and steel rolling turbid circulating water.
The commonly used slurry pump structure is as follows.
(1) Pump head architecture. The pump body adopts a double-layer pump casing (inner and outer double-layer metal structure), and the double pump casing shell structure is vertically split. The water outlet position can be installed and used at intervals of 45 degrees and rotated 8 different positions. To effectively prevent shaft seal leakage, a combination of power seals, packing seals, or mechanical seals is used. There is a labyrinth gap seal between the impeller and the rear guard plate, which greatly reduces the leakage of slurry to the packing box and effectively ensures the reliability of the seal. The impeller is equipped with back blades to timely discharge the backflow slurry, thereby increasing the volume ratio, reducing backflow and erosion, and improving the service life of overcurrent components. For the convenience of maintenance and disassembly, a disassembly ring is provided to avoid cutting the shaft due to inability to disassemble.
(2) Bracket structure. The bracket structure is a horizontal open type, which has been optimized in terms of hydraulic and structural design to extend the service life of the bearings. Reasonable distribution of radial and axial forces, and correct selection of bearing form, model, cooling and lubrication methods, have been achieved to meet the requirements of low heat generation and high service life of bearings.
(3) Shaft seal form. The shaft sealing device plays a sealing role between the pump body and the pump shaft. It can prevent air from entering the pump and prevent a large amount of water from leaking out of the pump. The sealing form of centrifugal slurry pumps usually adopts a secondary impeller with packing seal. The secondary impeller with packing seal is a fluid dynamic seal, which relies on the pressure head generated by the secondary impeller to resist the leakage of liquid at the outlet of the impeller. At the same time, the impeller cover plate is used to install a back blade with water seal ring and packing to prevent air from entering. The back blade and water seal ring are also used to reduce the pressure at the packing, which has the effect of preventing impurities from entering the seal.
install
The following checks should be carried out during the installation of slurry pumps:
(1) The size, position, and elevation of the foundation should meet the design requirements, and the anchor bolts must be properly and correctly fixed in the concrete foundation. The machine should not have missing parts, damage, or rust;
(2) According to the characteristics of the medium conveyed by the slurry pump, it is necessary to check the materials of the main components, shaft seals, and gaskets when necessary;
(3) The leveling and alignment of the slurry pump should comply with the technical specifications of the equipment. If there are no regulations, it should comply with the current national standard "General Specification for Construction and Acceptance of Mechanical Equipment Installation Engineering";
(4) The installation of all pipelines and fittings connected to the slurry pump, as well as the cleaning requirements for lubricating oil pipelines, shall comply with the relevant national standards.
Starting conditions
The conditions for starting the slurry pump are as follows:
(1) Before starting, check the slurry pump according to the routine inspection requirements of the pump.
(2) Confirm that the slurry pump pipeline is connected, the concentration bin is selected, the inlet valve is open, the selected concentrator is running, the slag discharge valve and flushing valve of the concentrator are closed, and the slag discharge pump is interlocked.
(3) Check that there are no debris in the slag pool and that the water level is above 1.2m.
(4) Check that the corresponding disruptor of the slurry pump has been activated and is functioning normally.
(5) Adjust the frequency converter of the slurry pump to less than 10%.
(6) Start the slurry pump on the DCS and slowly adjust the frequency of the frequency converter after the outlet valve is fully opened to meet the water volume of the reuse water tank.
(7) After the slurry pump starts normally, pay attention to the coordination between the slurry pump outlet and the recycled water pump outlet, as well as the water temperature of the slag conveyor.
Debugging and Running Operations
The trial operation of the slurry pump should meet the following requirements:
(1) The direction of rotation of the driving motor should be the same as that of the pump;
(2) Each fixed connection part should be free of looseness, and the specifications and quantities of lubricant added to each lubrication part should comply with the technical specifications of the equipment;
(3) Parts with pre lubrication requirements should be pre lubricated according to regulations;
(4) All indicating instruments and safety protection devices should be sensitive, accurate, and reliable;
(5) The turning gear should be flexible and free of abnormal phenomena;
(6) Before the trial operation of the high-temperature pump, the pump body should be preheated, and the temperature should rise uniformly. The temperature rise per hour should not exceed 500%; The temperature difference between the surface of the pump body and the process pipeline with working medium inlet should not exceed 400 ºC;
(7) Set up connection devices to eliminate the impact of temperature rise, and install bypass connection devices to provide cooling water sources.
When operating the slurry pump, the following points should be noted:
(1) Do not operate without water, do not adjust the suction capacity to reduce the displacement, and do not operate at low flow rates;
(2) Monitor the operation process to completely prevent leakage of the packing box, and use new packing when replacing the packing box;
(3) Ensure that the mechanical seal has sufficient flushing water flow, and excessive water flow is prohibited for water-cooled bearings;
(4) Do not use too much lubricant;
(5) Check according to the recommended cycle; Establish operation records, including operating hours, adjustment and replacement of fillers, addition of lubricants, and other maintenance measures and time; The suction and discharge pressure, flow rate, input power, temperature and vibration of the washing solution and bearings of the centrifugal pump should be measured and recorded regularly.

Wear and tear factors
There are several factors contributing to the wear of slurry pumps, including:
1) Characteristics of the medium.
2) Material characteristics.
3) The interaction between abrasives and materials.
The main ways to improve the service life of pump flow components are rational material selection, rational selection, and improved hydraulic design.
The most severely worn component during the pumping of solid-liquid mixtures by slurry pumps is the impeller, followed by the pump body or overcurrent components such as sheaths and protective plates. The wear of the pump depends on the intrinsic relationship between the following parameters:
1) Rheological properties of solid-liquid mixtures.
2) Solid particle size, shape, hardness, and density.
3) The structural type and parameters of the pump.
4) Pump speed or impeller circumferential speed.
5) The performance of pump materials, such as hardness, strength (elongation, acid and alkali resistance, heat resistance), etc.
Among the factors that affect the service life of slurry pumps, the first is the performance of the material, the second is the characteristics of the medium, and the third is the structure and hydraulic parameters of the pump, with operating conditions ranking last.

maintain
When maintaining the slurry pump, the following points should be noted:
(1) The water pressure and volume of the bearing should meet the regulations, and the tightness of the packing should be adjusted (or replaced) at any time to avoid causing leakage of the shaft seal. And replace the shaft sleeve in a timely manner.
(2) When replacing bearings, it is important to ensure that there is no dust inside the bearing components and that the lubricating oil is clean. When the pump is running, the bearing temperature should generally not exceed 60-65 ºC, with a maximum of 75 ºC.
(3) To ensure the coaxiality of the motor and pump, and to ensure the integrity and correctness of the elastic pad in the coupling, it should be replaced promptly if damaged.
(4) Ensure that the pump components and piping system are installed correctly, firmly, and reliably.
(5) Some components of the slurry pump are vulnerable parts, and in daily use, attention should be paid to the wear and tear of vulnerable parts, and they should be repaired or replaced in a timely manner. During the maintenance or replacement of vulnerable parts of the slurry pump, it is necessary to ensure correct assembly, reasonable gap adjustment, and avoid the occurrence of tight friction.
(6) The suction pipeline system of the slurry pump must be free of air leakage, and attention should be paid to whether the suction personnel are blocked during operation. The medium that needs to be processed by the slurry pump often contains solid particles, so the partition placed in the pump pool should meet the requirements for particles that the slurry pump can pass through, reducing the possibility of blockage caused by oversized particles or long fiber materials entering the pump body.