Application of slurry pump in Coal Preparation Plant

Slurry pumps are widely used in the transportation of slurry water, circulating water, coal slurry and heavy medium suspension. As an important auxiliary equipment in the process of coal preparation plant, the operation of slurry pump directly affects the normal operation of production system. There are two kinds of slurry pumps commonly used in coal washing plant: Horizontal single-stage centrifugal pump and vertical single-stage pump.

1. Slurry pump: pump the medium suspension in the hopper (according to the specified density) into the shallow tank heavy medium separation tank for the separation of raw coal.

2. Gravel pump: pump the dilute medium suspension in the dilute medium barrel into the magnetic separator for magnetic separation, and recover the concentrate (medium) after magnetic separation to the combined medium barrel.

3. Vortex pump: pump the slime in the slime bucket into the cyclone separator of the slime thickener for separation.

4. Horizontal pump: send the underground water pump to the thin medium barrel.

5. Water pump: the clear water clarified in the concentrator is pumped into the water washing system to spray water to remove medium and screen, and make up water for the system.

6. Underflow pump: concentrate the high concentration coal slurry water in the tank and pump it into the water washing system of coal slurry mixing drum.

7. Vertical slurry pump: pump high concentration coal slurry into the filter press to realize the separation of coal slurry and water.

8. Filtrate pump: the filtrate treated by the filter press circulates into the filtrate drum and is pumped to the concentration tank by the filtrate pump.

Generally, medium-sized coal preparation plants will be equipped with dozens or even hundreds of slurry pumps to form a complete coal washing process.

 

Fengwang manufactures the best slurry pumps and sludge pumps in a variety of industries for various markets and applications. With the latest modern technology of slurry pump, Fengwang slurry pump option can provide various types, sizes, speeds, metal and solid handling capacity. Our slurry pump option relocates a large number of liquids with retained solid mixtures and non suspended solids. We provide high-quality commercial slurry pumps for mining, agriculture, food treatment, waste treatment and other industries.

 

Fengwang has quite a number of slurry pumps and sludge pumps to choose from. We offer various types of centrifugal pumps and positive displacement pumps. Our sludge and mud pumps have great advantages over other pumps due to their challenging layout, simple maintenance and excellent efficiency in harsh applications. Therefore, Fengwang slurry pump can be used in a wide range of mining, dredging, mineral treatment, ash pumping, wastewater treatment, food processing, chemical industry, oil and gas refining and various other applications. Our pumps ensure the integrity required for these applications.

Why Do You Need A Coal Washing Machine?

 

The coal washing machine occupies a small area, saves energy and water, and employs less people. The production cost is greatly reduced, and the recovery of coal slime is not wasted.

 

What is the role of the coal washing machine?

Raw coal is inevitably mixed with impurities in the process of generation, mining, and transportation. With the deepening of mining, the quality of raw coal is getting worse and worse. In order to reduce the impurities in the raw coal, make effective and reasonable use of coal resources, and at the same time divide the coal into various products according to quality and specifications, it is necessary to mechanically process the coal. These machines are generally called coal washing equipment. A coal washing machine is just one kind of washing equipment.

 

The benefits you can get

1. Improve coal utilization efficiency and save energy

Increasing the utilization rate through the coal washing machine and improving the quality of coal will significantly improve the efficiency of coal utilization. Some studies indicate:

The use of washed anthracite in the production of synthetic ammonia can save 20% of coal.

The ash content of coking coal is reduced by 1%, the coke consumption of iron-making is reduced by 2.66%, and the utilization factor of the iron-making blast furnace can be increased by 3.99%.

Industrial boilers and kilns are burned with washed coal, and the thermal efficiency can be increased by 3%~8%.

When the ash content of power generation coal increases by 1%, the calorific value will decrease by 200～360J/g, and the standard coal consumption per kilowatt-hour of electricity will increase by 2～5g.

2. Improve coal quality and reduce coal pollutant emissions

After the coal is washed by the coal washing machine, 50%-80% of ash and 30%-40% of total sulfur (or 60% to 80% of inorganic sulfur) in the coal can be removed. The use of washed coal can effectively reduce smoke and dust, Emissions of SO2 and NOx. Washing 100 million tons of thermal coal can generally reduce emissions of 600 to 700,000 tons of SO2 and remove 16Mt of gangue.

3. Reduce capacity waste

Since most of my country’s coal-producing areas are far away from economically developed areas with a lot of coal, the coal transportation volume is large and the transportation distance is long. The average coal transportation distance is about 600 kilometers. The coal is washed by a coal washing machine to remove a large number of impurities. Each time it is washed 100Mt of raw coal can save 9600Mt-km of transportation capacity.

4. Optimize product structure and improve product competitiveness

The development of coal washing machine washing coal is conducive to the transformation of coal products from a single structure, low quality to multiple varieties and high quality. The realization of high-quality products. There are many users of coal consumption in my country, and the requirements for coal quality and variety are constantly increasing. In some cities, coal sulfur content is required to be less than 0.5% and ash content is less than 10%. If coal preparation is not developed, it will not be able to meet market requirements.

We are a coal washing supplier, please feel free to contact us if you need them.

Failure And Maintenance Of Slurry Pump

 

Many enterprise users reflect that the maintenance management of slurry pump is not perfect system. So how can we carry out scientific maintenance of slurry pump? In fact, during the operation of slurry pump, the following problems should be paid attention to in time.

1. Coupling clearance failure

Slurry pump in the process of operation, due to wear and tear of the balance plate, the rotor will move in the direction of the inlet side, resulting in a gap with the coupling. Therefore, the coupling clearance should be adjusted in time. As it will be affected by thermal expansion, usually, the coupling clearance can be adjusted to 2-3mm larger than the specified value.

 

2. Whether the bearings of slurry pump can operate normally

To see whether the bearing is normal, only two aspects: one is the oil temperature, not more than 60 ℃, the second is the sound, whether there is a strange sound, generally there will be an abnormal sound when there is damage to the parts.

 

3. Balancing device failure

If the balancing disk and the balancing ring in the balancing device are worn out, it will cause unevenness and make the balancing device malfunction. In this case, the groove in the device should be first taken to fill the welding process. Grind the pump casing, and add a piece of plastic with suitable thickness and softness at the combination of balance ring and pump casing. Make up for the defect of concave and convex. If the balance ring and balance plate are seriously worn out, they need to be replaced.

 

4. Whether the slurry pump has vibration

Pay more attention to observation, once you see the vibration, you will know where the problem is, so that you can get a timely solution. The reason usually slurry pump vibration is: the center pump and motor of the wrong installation; impeller or motor foot loose or not solid; bearing is not tight enough, not balanced rotor quality.

 

5. slurry pump whether there is leakage

The seal of slurry pump should be moderately tight, not too loose, and certainly not too tight. The packing should be able to drip slightly so that we can drain the heat and water. The packing used to seal should be replaced regularly, otherwise it will not be possible to have a sealing role after hardening.

 

6. Pump shaft failure

The pump shaft will drive the shaft sleeve to rotate in the process of rotation. If the pump shaft is bent or the bearing seat deviates from the pump shaft, it will cause the pump casing, shaft sleeve, seal ring and other parts to be worn. Increase the amount of vibration of the pump body, but also increase the axial thrust. Friction occurs between the balance disk and the balance seat, and the equipment fails. If the crack, wear and bending of the pump shaft is not serious, then the pump shaft can be repaired. If the bending degree of the pump shaft is greater than 0.06mm, the pump shaft should be corrected in time with a screw press to prevent failure.

 

In addition, slurry pump head, gearbox, clutch, including the cylinder, connecting rod and other parts, need to strengthen the management. Learn to listen to the sound shift, save trouble and easier to determine the fault.

We are a slurry pump manufacturer, please feel free to contact us if you need them.