In few of our last posts, we have explained in a great deal about high temperature filter, its industrial uses, composition and benefits. In this post, we will discuss one of the most important technical aspects of high temperature filter that is closely linked to its performance and that is its medium. Though a lot of media choices are there for high temperature filters, yet, in this article we will highlight some of the most common and popular ones.
The normal prevailing operating temperature of this medium is 500 degrees F. General applications of this medium based high temperature filter includes cement kilns, carbon back reactors, high temperature dryers, electrical furnaces and power plants. The fiberglass holds great resistance to most of the acids; however, it can be damaged by hydrofluoric acid. Therefore, this medium is not used in cases where salts and bases like bromides, chlorides and cyanides are involved. This medium had ordinary flex abrasion abilities and needs a 20 vertical wire support cage minimum, when used in the tubular bag form.
- PPS (Polyphenylene Sulfide)
The normal prevailing operating temperature is 375 degrees F. General applications of this medium based high temperature filter includes incinerators, coal-fired boilers, cement mills, fluidizes bed systems, gas and oil firings, Pulverized coal injection mechanism and asphalt plants. This medium has extra ordinary resistance to alkalis as well as acids.
This medium also operated effectively for applications with oxygen content up to 9 percent. It is suitable to work well in applications having high degree of moisture and where dew point crossings frequently occur. For applications that follow high emission standards, this medium makes the most suitable choice.
You will find most of the filters fitted with either of these mediums. In the next article, we will explain some more key mediums that are used on high temperature filters.