Five Factors Affect Adsorption Dryer’s Proper Operation



Adsorption dryer can achieve the drying effect through the "pressure change" (pressure swing adsorption principle). Obviously, working pressure is a very important part for normal operation of adsorption dryer. In addition to working pressure, other factors also have important impact like intake air temperature, condensate water, oil mist, regeneration gas capacity and so on, which also affects normal operation of the adsorption dryer.


Working Pressure

1. Saturated water content is inversely proportional to the pressure in compressed air, that is, the lower the working pressure, the greater the humidity load of the dryer, so the demand is also become larger for regenerative gas capacity;

2. From the dryer structure, we know that the regeneration air is determined by opening degree of the orifice plate or ball valve and the pressure difference on both sides. In the case of a certain circulation area, flowing orifice plate or regenerated gas amount of ball valve is proportional to the pressure, so the decrease of working pressure results in the decrease of regeneration gas amount, which reduces regeneration efficiency and adsorption efficiency of the adsorption dryer.

3. The volume of compressed air is inversely proportional to the pressure, the lower working pressure increases the flow rate of the compressed air empty tower, and shortens contact time between the adsorbent and compressed air, resulting in a decrease of dynamic adsorption capacity.

4. It will increase pressure loss in the adsorbed bed as the pressure drops, the velocity of tower increases.


Intake air temperature

The compressed air is saturated air with a certain temperature after entering adsorption dryer. Under the same pressure conditions, the temperature increase 5 ℃, and then saturated water content increased by about 30%, that is, the humidity of adsorption dryer increased by about 30%.

In addition, adsorption capacity of adsorbent will decrease with increasing temperature, so that the drying efficiency of adsorption dryer will decreases as the increasing of inlet temperature of the compressed air.


Condensate water

Rear cooler of air compressor discharged a supersaturated compressed air, containing a certain amount of condensate water. A small amount of condensate water has little effect on the adsorption dryer, and if adsorption dryer does not install gas-water separator and filter, or if a large amount of condensate water enters the adsorption tower due to abnormal factors, it will cause deterioration of adsorption, the temperature sharply rises, causing the adsorbent break down into powder when more worse. (Specifically: spray dust from the muffler, the rear dust- filter is blocked).

When the heat is sufficient, the water evaporates into a gas and expands rapidly to expand the adsorbent.


Oil mist

It will lead to poisoning of adsorption materials, and premature failure, affecting the dryer effect of removing water, if the oil is too much.


Regeneration gas amount

In running process, adsorption dryer can't randomly adjust regeneration gas amount. In addition, for heat adsorption dryer, the instantaneous flow of regenerated gas can’t be too small, otherwise it will reduce the heat transfer efficiency as a heat carrier, damaging the structure and performance of the adsorbent due to local overheating and most part heat-less.

At the same time, too small flow will cause low flow rate, and easily cause short circuit of adsorption layer due to air flow passing, resulting in "tunnel effect", which can't evenly transfer heat and effectively analyze.


This article from  www.bitemantech.com by Muriel.Zhou.



评论

发表评论

此博客中的热门博文

Modern Planning in the Field of Compressed Air

图片
In the past, people only consider the initial investment and operating energy costs such as some simple economic factors, they often overlook the influence pollutants in the compressed air for system when established a compressed air system , thus ignoring the compressed air quality (it can not reach standard will bring huge invisible waste for enterprises), and these losses are often much higher than the high quality purchase and operating costs of purification equipment. Perhaps many companies believe that compressed air equipment just little impact when select ordinary one, but what will actually appear on us? In the 1980s, the industry lagged far behind today, the developed countries put forward ISO8573 standards for the purity of compressed air as for different gas equipment, while it failed to supply the gas equipment standard of compressed air, which caused serious impact, such as shorten the service life, decrease accuracy, increase failure rate, poor quality, and the safet
阅读全文

The Importance of Brand Awareness

图片
Brand is an invisible asset for the enterprise, it’s also the most valuable wealth. in the rapid development of the modern life, the difference become shrinking for product performance, quality, sales service from different enterprises, so the brand will become the main factor to choose products for consumer. "Stupid businessmen sell products, smart businessmen sell brand" This sentence fully illustrates the importance of the brand for the enterprise . therefore, companies should have enough brand awareness, and strive to run the business brand. it is the core content of the product, and brand awareness isn’t all other means of marketing, such as Atlas, Ingersoll Rand, Sullair, Kobelco, etc. these enterprises prefer to brand recognition rather than products identification , and it’s also become the only element of market choice. Brand not only refers to the product quality, but also includes the appearance, technology, function, utility and others, it need long-term accumulat
阅读全文

“Throw a sprat to catch a herring" to get the maximum benefit in a short period

图片
There is a question, why do we establish business? Companies just considering saving cost regardless of construction of enterprises, but it real should need the cost of consumption. later hear a manager says to the subordinate, " I have to find ways to earn back for company spent every penny", perhaps this is a lot of top management staff thought, which is good point for a top manager, then we will be reach the business target to obtain the greatest benefits in a short period.  It is not so easy to realize how to get the maximum benefit in a short period. such as a lot of leading brands seem to be impeccable, while the leading brand's business is far less flexible than some small businesses for imbalanced development of different regional market, much longer product line, and imbalanced development in different products. it is difficult to develop appropriate products and marketing strategy according to local conditions due to consider the national market. I
阅读全文