Pneumatic and hydraulic conveying

Pneumatic and hydraulic conveyors

1. Pneumatic and hydraulic Conveyers PRESENTERS Arsal hashmi 021 Bahzad raza o18 Zeeshan sami o20 Mansoor ghaffar o23

2. Learning objects The purpose of this topic is to provide a basic introduction to the hydraulics and pneumatics conveyor. So by the end of the presentation you will be able to identify and describe them.

3. C onveyor A conveyor system is a common piece of mechanical handling equipment that moves materials from one location to another. Conveyors are especially useful in applications involving the transportation of heavy or bulky materials.  They can be divided into two: classes those that are part of machines for processing, and those that move product in various stages of fabrication .

4. Pneumatic conveyor: A Conveyor which transports dry, free flowing, granular material in suspension, or cylindrical carrier with in a pipe, or duct by means of Air stream or pressure of vacuum generated by an air compressor. it is also called air conveyor . It depends on the high velocity air stream to move material in about the same manner as the wind.

5. Pneumatic conveying systems are used for the transportation of bulk materials and granulates in pipelines. The transportation via over pressure and under pressure is an indispensable technology in the field of bulk material handling in order to transport bulk materials from A to B. The maximum conveying pressure is 2.5 bar over pressure and 0.6 bar under pressure. The product is feed into the system by airlocks, injectors, screw pumps or pressure vessel. The physical properties of the product as well as conveying capacity and function influence the design of the plant.

6. Working principle: Every pneumatic would make the use of pipe lines or ducts called transportation lines that carry mixture of materials and a stream air. These materials are mostly dry such as cement. These materials can be transported conveniently to various destinations b means of stream for high velocity Air through pipe lines. Products are moved through various tubes via Air pressure allowing for external vertical versatility.

7. Types of pneumatic systems: Three types of pneumatic systems are as follows: 1.Suction or vacuum systems 2.Pressure type systems 3.combination systems All these are used to generate high velocity air stream.

8. Classified by operating principle: 1. Dilute phase conveyor: Dilute phase pressure conveyor Dilute phase vacuum conveyor 2 . Dense phase conveyor: Dense phase pressure conveyor Dense phase vacuum conveyor

9. Pneumatic conveyor systems Dilute phase conveyor particles: suspended in conveying gas transport: pressure decreases volume increase Dense phase conveyor particles: not suspended in conveying gas transport: pressure increases volume decreases

10. Types of material conveyed Cement Clay Coke Salt Plaster

11. Advantages: Gives more flexibility than mechanical conveyors. Occupy less space Totally enclosed Low maintenance

12. Disadvantages: High power requirements. Large dust collection. Can’t be used for large particles high bulk density material sticky material

13. Hydraulic conveyor A type of conveyor in which water jets form the conveying medium for bulk materials through pipes or troughs. (OR) A system for handling material, such as ash from a coal-fired furnace; refuse is flushed from a hopper or  slag tank to a grinder which discharges to a  pump for conveying to a disposal or dewatering bin.

14. Hydraulic conveyor The term hydraulics refers to the power produced in moving liquids.  Hydraulic power in the form of water wheels and other simple devices has been in use for centuries, but it was not until the 17th century that the principles of hydraulics were formulated into scientific laws.                    Modern hydraulics systems are defined as:   The use of confined liquids to transmit power, multiply force produce motion efficiently.

15. Hydraulic conveying is becoming more and more important as pneumatic conveying technologies (dense or dilute phase conveying) are reaching their physical and economical limits for long conveying distances, high capacities and particularly stringent requirements to product purity. Hydraulic conveying, which had been used in the past for the transport of coal, is now experiencing a comeback in the petrochemical industry. This is mostly due to the constantly increasing conveying capacities and requirements to product quality, thus a minimum product abrasion during conveying