Instrument_Air_Dryer_Presentation.pptx14

Instrument_Air_Dryer_Presentation.pptx

1. Instrument Air Dryer Overview, Working Principle, Types, and Applications

2. Introduction Instrument Air Dryer is used to remove moisture from compressed air before it is used in instruments. Ensures reliable operation of pneumatic instruments and control systems. Moisture-free air prevents corrosion, freezing, and malfunctioning of sensitive components.

3. Importance of Dry Air Moisture can cause rust and corrosion in instruments. Freezing in pipelines can block air flow. Reduces accuracy and life of pneumatic instruments. Ensures consistent and safe plant operation.

4. Principle of Operation Based on removal of water vapor from compressed air. Common principles: cooling, adsorption, or permeation. Lowering temperature or using desiccant materials achieves dew point reduction.

5. Types of Air Dryers 1. Refrigerated Air Dryer 2. Desiccant (Adsorption) Air Dryer 3. Membrane Air Dryer

6. Refrigerated Air Dryer Uses refrigeration cycle to cool compressed air. Moisture condenses and is separated mechanically. Delivers air with a dew point around +3°C to +10°C. Suitable for general industrial applications.

7. Desiccant Air Dryer Uses adsorbent materials such as silica gel or activated alumina. Removes moisture by adsorption process. Can achieve very low dew points (-40°C to -70°C). Commonly used in instrument air systems in process industries.

8. Membrane Air Dryer Uses semi-permeable membranes to separate water vapor from air. Compact and maintenance-free design. Best suited for low flow and point-of-use applications.

9. Instrument Air Quality Standards As per ISO 8573-1 standard. Specifies limits for solid particles, water, and oil content. Typical class for instrument air: Class 2.2.1 or better.

10. Components of Air Dryer System Air compressor Aftercooler and moisture separator Air receiver Air dryer unit Filters (pre-filter and after-filter) Drain system and controls

11. Operation & Control Automatic changeover between drying and regeneration modes in desiccant dryers. Drain valves automatically remove condensed water. Pressure and temperature sensors monitor system performance.

12. Maintenance & Troubleshooting Regularly inspect filters and drain valves. Check dew point and air quality. Replace desiccant periodically. Common issues: high dew point, oil carryover, clogging of filters.

13. Applications and Conclusion Used in refineries, chemical plants, power plants, and food industries. Ensures reliable pneumatic control and instrumentation. Selection depends on dew point requirement and application. Instrument air dryers are vital for safe and efficient operations.