f vertical froth pump manual

Slurry Pump as Filter Press Feed Pump for Sludge Dewatering in Wastewater Treatment Process

Introduction

Generally will be suitable for conveying liquid (water) containing suspended solids in the pump known as the slurry pump. At present, the dressing, coal preparation plant in the process one of the indispensable equipment. The slurry pump can be divided into single-stage / multi-stage, single-suction / double-suction, cantilever, horizontal / vertical and horizontal open / vertical combination of pump casing according to different principles. As shown in the figure, , The pump casing, the pump shaft, the bearing and the bracket, the power also includes the motor, the wheel or the belt pulley coupling and so on, the wear-resisting part also includes the liner sleeve and so on, the seal includes the shaft seal, Including the stent, etc., but the internal principle is the same, when the impeller fast rotation, the blade prompts the media to rotate quickly, rotating the media in the centrifugal force from the impeller fly out of the pump medium is thrown, the impeller The central part of the formation of a vacuum area, the media in the atmospheric pressure (or water pressure) under pressure through the pipe network into the feed tube. This endless cycle, you can achieve continuous feeding, so as to achieve the design requirements of the lift and flow. Of course, the feed method is currently used more pressure-type, that is higher than the feed level material, you can subtract from the upper pipe or pump shell to the internal irrigation steps.

Type division

1.From the number of impeller division: single-stage slurry pump and multi-stage slurry pump. 2.From the pump shaft and horizontal position: Horizontal slurry pump and vertical slurry pump. 3.From the way inhaled water division: single suction slurry pump and double suction slurry pump. 4.From the pump shell structure: single-shell slurry pump and double-shell slurry pump.

Performance parameters

Speed: direct drive motor 2900/1480/980/730/590 r / min Pulley indirect drive to meet customer requirements Medium temperature: generally ≤ 80 ℃ special up to 110 ℃ Solid mixture concentration: mortar concentration ≤ 45% pulp concentration ≤ 60% Flow range: 30-2000m3 / h Head range: 15-130m

Working principle

First about the relationship between centrifugal pumps and slurry pumps, and then the principle of slurry pump will naturally clear. Centrifugal concept is from the pump principle. There are many kinds of pumps, according to different angles can be divided into dozens of categories. Centrifugal pump is divided from the working principle of the pump is through centrifugal force to achieve the process of pressurization to the transmission medium. There are also common types, including the screw principle, plunger principle can be differentiated from the centrifugal principle of the pump. Having finished the concept of centrifugal pump, say slurry pump, slurry pump is from another point of view of the pump, that is, from the transmission medium to divide. As the name suggests, the slurry pump is a mixture of solid particles and water that contains dross. But in principle, slurry pump is a kind of centrifugal pump. Centrifugal pump is the main working parts of the impeller and the case, the impeller within the chassis device is located on the shaft, and the prime mover connected to form a whole. When the prime mover drives the impeller to rotate, the blades in the impeller force the fluid to rotate, i.e., the blade acts on the fluid in its direction of motion, forcing the pressure potential energy and kinetic energy of the fluid to increase. At the same time, the fluid under the action of inertia force, from the center to the impeller edge flow, and a very high speed out of the impeller into the extrusion chamber, and then discharged through the diffuser, the process known as the water pressure process. At the same time, because the impeller center of the fluid flow to the edge of the impeller center to form low pressure area, when it has enough vacuum, the suction pressure (usually atmospheric pressure), the fluid into the impeller through the suction chamber, the process known as Water absorption process. As the impeller continuous rotation, the fluid will be continuous discharge, inhalation, the formation of continuous work. Centrifugal pump (including slurry pump) work process, in fact, is a process of energy transfer and transformation. It will motor high-speed rotation of the mechanical energy, through the pump blades and is transferred to be pumping fluid pressure and kinetic energy.

Industry use

Slurry pump can be widely used in mining, power, metallurgy, coal, environmental protection and other industries containing abrasive slurry transmission of solid particles. Such as metallurgical dressing plant pulp transport, thermal power plant hydraulic ash, coal preparation and coal slurry and heavy medium transport, dredging river, river dredging and so on. In the chemical industry, can also be transported some of the corrosive slurry containing crystals. First of all, in the application of concentrator, about 80% are used in the mining industry concentrator. As the ore is relatively poor primary election conditions, so in this section, slurry pump life is generally low. Of course, different ore, abrasive is not the same. Such as concentrate transportation and other sections of the relative erosion of the pump to reduce the overall service life is longer. So the average user in the procurement process often ask the supplier's product life time, strictly speaking any manufacturer and so will not unfounded for the user an accurate commitment to the use of life cycle, because the flow of components life (Wear-resistant corrosion-resistant) life depends on a number of different factors, conditions of the diversity and complexity of the same quality of life of the material is different. But in the pre-selection stage can let the strength of the manufacturer to do a reasonable working condition selection design. At present, China's power plants are mainly thermal power and water power generation, in the thermal power plant, due to a large number of coal-fired power generation, coal slag or slag after the need to remove the slurry pump is used in addition to the role of ash, slag by mixing A certain amount of water, the slurry pump to transport it to the place where the ash pile, so sometimes slurry pump in the power plant has become ash pump. Again, in the coal washing industry, due to different working conditions, larger coal, coal gangue easily blocked, the design requirements for the slurry pump is high. Huaibei Mining Bureau under a coal washing plant in 2005 by a specially designed to replace the original imported from Australia slurry pump, has been operating normally, transporting larger coal, coal gangue without clogging, the use of wear life than imported pumps. In the field of seawater selection sand, slurry pump applications are beginning to be recognized by customers. But in the seawater in the election of sand, river dredging, slurry pump more easily known as the sand pump, dredging pump. Although the name is different, but from the structural characteristics and performance of the pump principle, can be known as the slurry pump. Therefore, in this seawater, we often choose sand sand pump, dredging in the river dredging used to call dredging pump. Although the use of slurry pump is extensive, but the correct application is very important. Slurry pump because of the limitations of its name makes some non-industry people misunderstanding, in fact, mud pumps, impurity pumps, dredging pumps, dredging pumps, and so on in the slurry pump applications.

Industry Standard

This standard applies to the delivery of liquid containing suspended solids (such as ore, ash, slime, sediment, and gravel, etc.) pump. The temperature of the solid-liquid mixture being conveyed is generally not more than 80 ° C (pump-lined double-shell pumps do not exceed 60 ° C).

Terms

1 high-lift pump: set point above the 50m pump head. 2 low-lift pump: set point head less than or equal to 50m pump. 3 Minimum cross-section size: impeller, shell and other flow parts of the minimum cross-section size. 4 vulnerable over-current components: due to erosion of the slurry and easy to failure parts, such as impeller, double-hull pump sheathing and guarding, single-shell pump pump and pump cover. 5 Lining pieces of metal skeleton: placed in the rubber from the role of supporting the fixed metal rubber components. 6 The first critical speed: pump rotation part of the first (lowest) transverse natural frequency and rotational frequency consistent with the pump speed.

Type

Pump for the single stage, single suction, axial suction, according to pump casing structure and the direction of the pump shaft is divided into three structures: 1 Horizontal double-shell pumps with inner and outer shells - Pumps suitable for a wide range of outlet diameters. The inner shell material is divided into metal, rubber and other non-metallic materials. The inner shells of the different materials are in the same The enclosure shall be interchangeable. 2 vertical or horizontal single-shell pump - for the discharge diameter of less than or equal to 200mm low head pump 3 The driving end of the pump shaft is regarded as clockwise. 4 For pumps with a secondary impeller seal, the maximum allowable efficiency is 5%.

Performance

1 Lining rubber impeller maximum head should not exceed 63m. The maximum permissible line speed shall not exceed 30 m / m. 2 bearings generally use rolling bearings, and the use of thin oil or grease lubrication, the operating temperature should not exceed 75 ° C. 3 pump transmission can choose flexible couplings, belts or hydraulic couplers and so on. Couplings, V belts and pulleys should have a safety shield. 4 For double hull pumps with inner shell of rubber, the maximum size of the solid particles in the slurries shall not exceed 3mm and there shall be no sharp edges and corners. For the double shell pumps of single shell pumps and metal inner shells, the maximum size of the solid particles in the slurry Shall not exceed 80% of the minimum dimension of the flow cross-section. 5 Packing Seal The water pressure should be 35 kPa above the pump discharge pressure.