Function and operation method of slurry pump - china do pump
China Do Pump specializes in R & D, production and sales of large particle sand suction pumps, sand pumps, mud pumps and other equipment. Especially in dredging, sand mining and dyke consolidation, he has rich experience. We have been focusing on sand suction pumps for 20 years. We not only provide high-quality products and overall industry solutions, but also provide on-site installation services. Please contact us at any time for design and equipment issues regarding dredging and sand suction.
Slurry pump belongs to a type of centrifugal pump. Conceptually, it refers to a mechanism that increases the energy of solid and liquid mixed media through the action of centrifugal force (the rotation of the impeller of the pump), which converts electrical energy into kinetic energy and potential energy of the media. device.
The name of the slurry pump is a centrifugal pump divided from the perspective of conveying medium. Slurry pump function Slurry pump can be widely used in mining, power, metallurgy, coal, environmental protection and other industries to transport slurry containing abrasive solid particles. Such as metallurgical beneficiation plant slurry transportation, thermal power plant hydraulic ash removal, coal washing plant coal slurry and heavy medium transportation, dredging rivers, river dredging, etc. In the chemical industry, some corrosive slurries containing crystals can also be transported. At present, about 80% of the application range of slurry pumps are used in mineral industry concentrators.
Due to the poor primary ore selection conditions, the service life of the slurry pump is generally low in this section. Of course, different ores have different abrasive properties. In the coal washing industry, due to the different working conditions, large coal lumps, coal gangue is easy to block, and the design requirements for the slurry pump are very high. A coal washing plant affiliated to the Huaibei Mining Bureau adopted a specially designed slurry pump that replaced the original import from Australia in 2005. So far, it is operating normally. It transports large coal lumps and coal gangue without clogging, and the wear and tear life exceeds the foreign imported pump. In the field of seawater sand separation, the application of slurry pumps has gradually begun to be recognized by customers. But in sand selection in seawater, dredging in river channels, slurry pumps are more easily considered as sand pumps, dredging pumps. Although the names are different, in terms of structural characteristics and pump performance principles, they can be generally called slurry pumps. Therefore, in this seawater sand selection, we are often called sand pump, and it is customary to call it dredging pump in river dredging.
Slurry pumps are widely used, but correct application is very important. Due to the limitations of the name of the slurry pump, some people in this industry have misunderstood it. In fact, slurry pumps, impurity pumps, dredge pumps, dredging pumps, etc. are all in the application range of slurry pumps. In the application process of slurry pump, it is necessary to pay attention to reasonable design, correct calculation, and proper selection. These points are very important.
Operation of slurry pump 1. Check before operation
1) Check that the rotation direction of the motor is consistent with the rotation direction specified by the pump (please refer to the corresponding model manual). When testing the rotation direction of the motor, the motor should be tested separately, and must not be connected with the pump and tested at the same time.
2) Check whether the elastic pad in the coupling is complete and correct.
3) Check whether the rotation of the motor shaft and the pump are concentric.
4) There should be no tightness or friction in the pump of the handcart (including the motor).
5) Check whether the bearing box is filled with bearing oil to the position indicated by the oil mark.
6) Before starting the slurry pump, the shaft seal water must be opened (the mechanical seal is cooling water). At the same time, the pump inlet valve should be expanded and the pump outlet valve should be closed.
7) Check if the valve is flexible and reliable.
8) Others, such as anchor bolts, flange gaskets and bolts. Whether the piping system, etc. are installed correctly, firmly and reliably.
2. Start-up operation and monitoring
1) Before starting the operation of the slurry pump, the pump inlet valve should be opened and the pump outlet valve should be closed. Then start the pump. After the pump starts, slowly open the pump outlet valve. The size and speed of the pump outlet valve should be controlled by the pump without vibration and the motor does not exceed the rated current.
2) The start of the pump for series connection also follows the above method. Only after starting the first-stage pump, the outlet valve of the last-stage pump can be opened a little (the size of the opening is preferably based on the current of the first-stage pump motor as 1/4 of the rated current), and then the second-stage and third-stage can be started one after another. Until the final pump and the series pump are all started, the outlet valve of the large final pump can be gradually opened. The size of the valve opening should be controlled by the pump not vibrating and the pump motor of any stage not exceeding the rated current.
3) The slurry pump is mainly for the purpose of conveying flow, so it is best to install a flow meter (meter) in the operation monitoring system to monitor whether the flow meets the requirements at any time; in the pipeline system and slag flushing system equipped with cyclones In the filter press dehydration system, a certain pressure is also required at the outlet of the pipeline. Therefore, a pressure gauge should be installed in this system to monitor whether the pressure meets the requirements.
4) In addition to monitoring the flow and pressure, the motor should also monitor the motor not to exceed the rated current of the motor during operation. Monitor the oil seals, bearings, etc. at any time for normal conduction, pump evacuation or overflow pool, etc., and deal with them at any time.
3. Routine maintenance of the slurry pump
1) The suction pipeline system of the pump is not allowed to have air leakage, and the inlet grid of the pump pool should meet the requirements of the particles that the pump can pass, so as not to cause large particles or long fiber materials to enter the pump. Clogged.
2) Replace vulnerable parts in time, maintain and assemble correctly, adjust gaps reasonably, and avoid tight and abrasion phenomena.
3) Bearing water pressure and water volume must meet the regulations, adjust (or replace) the tightness of the packing at any time, and do not cause shaft seal slurry leakage. And replace the shaft sleeve in time.
4) When replacing the bearing, make sure that the bearing assembly is dust-free and the lubricating oil is clean. When the pump is running, the bearing temperature is generally not more than 60-65 ℃, and the highest is not more than 75 ℃.
5) To ensure the coaxiality of the motor and the pump, and to ensure that the elastic pad in the coupling is complete and correct, it should be replaced in time after damage.
6) Ensure that the pump components and piping system are installed correctly, firmly and reliably. 4. Disassembly and assembly of slurry pump
1) Disassembly and assembly of pump head The disassembly and assembly of the pump head and the clearance adjustment should be carried out according to the assembly drawing.
2) The disassembly and assembly of the packing of the shaft seal should be carried out according to the assembly drawing. In order to ensure the sealing effect of the packing shaft seal, the shape of the packing opening should be cut as shown in the figure below. When it is installed in the packing box, the adjacent The opening of the packing should be staggered by 108 degrees.
China Do Pump specializes in R & D, production and sales of large particle slurry pumps, sand pumps, mud pumps and other equipment. Especially in dredging, sand mining and dyke consolidation, he has rich experience. We have been focusing on sand suction pumps for 20 years. We not only provide high-quality products and overall industry solutions, but also provide on-site installation services. Please contact us at any time for design and equipment issues regarding dredging and sand suction.
