Description

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• Air Dehydration

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Moisture is always present and all atmospheric air contains some water vapor, which will begin to condense into liquid water when the air or gas cools past the saturation point.

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Moisture in compressed air used in a manufacturing plant causes problems in the operation and can adversely affect the process or product being manufactured.

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1. Causes rust and increased wear of moving parts in production equipment as it washes away lubrication.

2. Can adversely affect the color, adherence, and finish of paint applied by compressed air.

3. Can jeopardize process industries where many operations are dependent upon the proper functioning of pneumatic controls.

4. Can freeze in control lines in cold weather, which  may cause faulty operation of controls.

5. Causes corrosion of air or gas operated instruments, giving false readings, interrupting or shutting down plant processes.

6. Cause a short circuit in the circuit in electronic industries.

7. Cause drug failure in pharma industries.

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• Gas Dehydration

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Water vapor causes the formation of hydrates, over saturation of natural gas, and corrosion of equipment. Hydrates are solid, ice-like crystallized compounds formed of hydrocarbons and water. Hydrate formation occurs in high-pressure well streams with a low temperature. Hydrates can form, however, at temperatures above the freezing point. The high pressure increases saturation and creates more water vapor. Hydrates cause freezing and blocking of pipelines, valves, and other equipment, bringing production to a halt. Over-saturated gas does not meet pipeline specifications of 7 pounds per mmcfd, which must be removed in order to sell. The temperature and pressure determine whether water is in a gaseous state or has condensed into a liquid. When in liquid form, water also causes corrosion to equipment. In order to prevent these harmful effects, gas is dehydrated by being condensed from vapor into liquid form and then removed by either adsorption or absorption. 

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• Popular Desiccant for Air and Gas Dehydration

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There are many popular methods and materials to remove water in air such as membrane methods, refrigerated methods (regenerative desiccant dryer), desiccant based methods (refrigerant type dryer). To remove the water in gas, Glycol drying, desiccant based natural gas dehydration, cooling with injection of hydrates inhibitors (glycol or methanol) and membranes based on elastomer or glassy polymers are widely used.

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The most widely used desiccant in air and gas drying includes silica gel, activated alumina, zeolite molecular sieve, etc. For regenerative air dryer, activated alumina and molecular sieve 4A are most popular desiccant, in electronic, food and pharma industries, silica gel and zeolite molecular sieve are also perfect desiccant to protect the goods from deactive.