What Is a Slurry Pump?

Slurry pump refers to a machine that converts electrical energy into the kinetic and potential energy of a medium by increasing the energy of a solid and liquid mixed medium through the action of centrifugal force (the rotation of the pump's impeller). Mainly used in: mining, power plants, dredging, metallurgy, chemical, building materials and petroleum industries.

in

The slurry pump conveys a mixture of solid particles containing dross and water. However, in principle, the slurry pump is a kind of centrifugal pump. It is mainly used in the iron and steel enterprises for slurry transportation in converter dust removal water, blast furnace gas washing water, continuous casting turbid water and rolling steel turbid water.

The common slurry pump structure is as follows.

(1) Pump head architecture. The pump body adopts a double-layer pump housing (inner and outer double-layer metal structure). The structure of the double pump housing is vertical and open. The position of the water outlet can be installed at 45 different positions at 45 ° intervals. To prevent effectively

The following checks should be performed when the slurry pump is installed:

(1) The size, position and elevation of the foundation shall meet the design requirements,

The conditions for starting the slurry pump are as follows:

(1) Check the slurry pump according to the general inspection requirements of the pump before starting.

(2) Confirm that the slurry pump pipeline is open, the thickening bin has been selected, the inlet valve has been opened, the selected thickener has been operated, the thickener slag discharge door and the flushing door have been closed, and the slag discharge pump is chained.

(3) Check that there are no debris in the slag tank, and the water level is greater than 1.2m.

(4) Check that the perturbator corresponding to the slurry pump is activated and normal.

(5) Adjust the slurry pump inverter to less than 10%.

(6) Start the slurry pump on the DCS, and slowly adjust the frequency of the inverter after the outlet valve is fully opened to meet the water volume of the reuse pool.

(7) After the slurry pump starts normally, pay attention to the cooperation of the water from the slurry pump, the water from the return water pump, and the water temperature of the slag-fishing machine. ^[1]

The trial run of the slurry pump should meet the following requirements:

(1) The steering of the drive motor should be the same as that of the pump;

(2) There should be no looseness in each fixed connection part, and the specifications and quantity of lubricants filled in each lubricating part should meet the requirements of the equipment technical file;

(3) The parts with pre-lubrication requirements shall 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 from abnormal phenomena;

(6) The high temperature pump should be preheated before the test run, the temperature should be uniformly increased, and the temperature rise per hour should not be greater than 500%; the temperature difference between the surface of the pump body and the process pipeline with the working medium inlet should not be greater than 400

(7) Set up connection devices to eliminate the influence of temperature rise, and set up bypass connection devices to provide cooling water sources.

Pay attention to the following points when the slurry pump is running:

(1) It is forbidden to run without water, do not adjust the suction to reduce the displacement, and it is forbidden to run at too low flow;

(2) Monitor the operation process to completely prevent the stuffing box from leaking, and use new packing when replacing the stuffing box;

(3) Ensure that the mechanical seal has sufficient flushing water flow, and water-cooled bearings are prohibited from using excessive water flow;

(4) Do not use too much lubricant;

(5) Perform inspections at recommended intervals; establish operating records, including operating hours, adjustments and replacements of fillers, adding lubricants and other maintenance measures and time; suction and discharge pressure, flow, input power, washing The temperature of the fluid and bearings, as well as the vibrations, should be measured and recorded regularly. ^[3]

The factors of slurry pump wear are as follows:

1) Medium characteristics.

2) Material characteristics.

3) Interaction between abrasive and material.

The main ways to improve the service life of pump over-flow parts are reasonable material selection, reasonable selection, and improved hydraulic design.

The most worn parts of the slurry pump when pumping the solid-liquid mixture are

Pay attention to the following points when maintaining the slurry pump:

(1) The bearing water pressure and water volume must meet the requirements, and the tightness of the packing can be adjusted (or replaced) at any time, so as not to cause shaft seal leakage. And replace the sleeve in time.

(2) When replacing bearings, be sure to ensure that there is no dust in the bearing components and that the lubricant is clean. The bearing temperature when the pump is running is generally not more than 60 to 65 ° C, and the maximum is not more than 75 ° C.

(3) It is necessary to ensure the coaxiality of the motor and the pump, to ensure that the elastic pads in the coupling are complete and correct, and they should be replaced in time after damage.

(4) Ensure that the pump components and piping system are installed correctly, firmly and reliably.

(5) Some parts of the slurry pump are wearing parts. In daily use, pay attention to the wearing of the wearing parts and repair or replace them in time. During the repair or replacement of the consumable parts of the slurry pump, it is necessary to ensure the correct assembly and reasonable clearance adjustment to avoid the occurrence of tight friction.

(6) The suction piping system of the slurry pump must be free of air leakage. At the same time, attention should be paid to whether there is a blockage in the suction population during operation. The medium that the slurry pump needs to deal with often contains solid particles, so the grille placed in the pump pool should meet the requirements of the particles that the slurry pump can pass, reducing the possibility of blockage caused by excessively large particles or long fiber materials entering the pump Sex. ^[3]