Saturday 27 October 2018

What is use of Compressed air dryer

Compressed air dryer


A compressed air dryer is used for removing water vapor from compressed air. Compressed air dryers are commonly found in a wide range of industrial and commercial facilities.

Compressed air dryers are special types of filter systems that are specifically designed to remove the water that is inherent in compressed air. The process of compressing air raises its temperature and concentrates atmospheric contaminants, primarily water vapor. Consequently, the compressed air is generally at an elevated temperature and 100% relative humidity. As the compressed air cools, water vapor condenses into the tanks, pipes, hoses and tools that are downstream from the compressor.

Excessive liquid and condensing water in the air stream can be extremely damaging to equipment, tools and processes that rely on compressed air. The water can cause corrosion in the tank(s) and piping, wash out lubricating oils from pneumatic tools, emulsify with the grease used in cylinders, clump blasting media and fog painted surfaces. Therefore, it is desirable to remove condensing moisture from the air stream to prevent damage to equipment, air tools and processes. The function of removing this unwanted water is the purview of the compressed air dryer.

There are various types of compressed air dryers. These dryers generally fall into two different categories, Primary and Secondary. Their performance characteristics are typically defined by flow rate in Standard Cubic Feet per Minute (SCFM) and dew point expressed as a temperature, (sometimes referred to as Pressure Dew Point.)

Primary Dryers: Coalescing, Refrigerated and Deliquescent.

Secondary Dryers: Desiccant, Absorption and Membrane.

Refrigerated Air Dryer

Refrigeration dryers employ two heat exchanges, one for air-to-air and one for air-to-refrigeration. However, there is also a single TRISAB heat ex-changer that combines both functions. The compressors used in this type of dryer are usually of the hermetic type and the most common gas used is R-134a and R-410a for smaller air dryers up to 100 cfm. Older and larger dryers still use R-22 and R-404a refrigerants. The goal of having two heat ex-changers is that the cold outgoing air cools down the hot incoming air and reduces the size of compressor required. At the same time the increase in the temperature of outgoing air prevents re-condensation.

Some manufacturers produce "cycling dryers". These store a cold mass that cools the air when the compressor is OFF. When the refrigeration compressor runs, the large mass takes much longer to cool, so the compressor runs longer, and stays OFF longer. These units operate at lower dew points, typically in the 35–40 °F range. When selected with the optional "cold coalescing filter", these units can deliver compressed air with lower dew points. Non-cycling dryers use a hot gas by pass valve to prevent the dryer from icing up.

Some manufacturers produce "cold coalescing filters" that are positioned inside of the air dryer at the point of the lowest air temperature (the point at which maximum condensation has occurred) 

Source:  " Wikipedia " 


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Monday 1 October 2018

heatless air dryer working principle

Heatless air dryer working principle

Heatless Desiccant dryer

All about heatless air dryers

A majority of the Industrial Compressed Air Systems and different other applications of air dryers involve the use of Heatless Compressed Air  systems. High Pressure Gas and Air Drying Systems also involve the use of these compressed air dryers in many of their applications. Annair DryChill Tech india Pvt Ltd. in heatless air dryer manufacturing.

How heatless air dryer it functions?

The simplest form of a desiccant kind of air dryer is the heatless compressed one. It can achieve a dew-point of -40°C for the compressed air systems as well as the other applications of air dryers. After passing through the pre-filter, the wet incoming compressed air passes thorugh the assembly of the slide piston. Next, this air is directed towards the first chamber where in it travels upwards through the desiccant bed consisting of activated alumina or molecular sieves. This causes it to dry up due to the adsorption effect of the bed. The dry compressed air coming out of the first chamber now travels through the assembly of check valves hence paving its way through the alter-filter and thereby to the area of application or work. The desiccant in the second chamber that had been wetted in the previous cycle regenerates simultaneously as the compressed air dries in the first chamber. The purge valve depressurizes the second chamber down to the atmospheric pressure in the downward direction. Meanwhile, a portion of the dry compressed air flushes the desorbed moisture out by passing through the needle valve or orifice plate through the desiccant. The purge valve closes and the tower slowly re-pressurizes to line pressure ensuring a smooth changeover as the regeneration completes. An effective dewpoint of -40°C or even better is obtained at atmospheric pressure with an additional period of 5 minutes for drying. An approximate of 60 seconds is all the re-pressurization takes in the regeneration process. This is the principle involved in heatless air dryer manufacturing.

Useful Links:-
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