Trimetric combines everything needed for efficient hot gas filtration in one medium: high retention rate, heat resistance up to 600°C, mechanical strength against vibration, and reproducibility during operation. With this new product series, GKD puts the optimized combination efficiency of Dutch woven and metal fiber nonwovens into practice for the first time.
Suitable for specific applications, stable filter elements can be deployed in all designs of standard dust filters-or in bag filter systems with minimal adjustments to fixtures.
Whether it is the production of color pigments and catalysts, the recycling of reusable materials, or the heating of wood chips, industrial and regional waste, the filtration and treatment of hot air streams play a key role in meeting the growing demands for environmental protection and cost-efficiency. The recovery of heat energy after the filtration process is of decisive importance for the carbon dioxide emissions and overall efficiency of the system.
Operating temperatures above 260°C not only eliminate energy-consuming exhaust gas reheating, but also help protect downstream devices such as heat exchangers, catalysts or gas scrubbers. At low process temperatures, tar deposits can form coatings that are difficult to remove and lead to time-consuming and costly cleaning.
However, a higher operating temperature will put more pressure on the filter media used to ensure a very good retention rate of airflow, even for fine particles smaller than 0.1 µm. The most common temperature range currently used to separate particles from hot gas streams is between 300 and 500°C. However, as the temperature increases, the pressure loss of this filter cake forming dust filtration also becomes greater. Therefore, regular cleaning of the filter media through pressure pulses is essential to maintain the performance of the filter.
The maximum temperature limit for filter media made of PTFE or other synthetic fibers is 260°C. More importantly, they may be damaged by smoldering particles or even catch fire, thereby endangering the safety of the entire system. Therefore, ceramic filters are the preferred technology at higher temperatures. However, their length is limited because they start to vibrate due to the pressure pulse used for regeneration-and therefore risk breakage. The filter media made of metallic materials can withstand temperatures up to 600°C, is non-flammable, and can withstand vibrations and is mechanically robust. However, until now, they have not managed to achieve the retention rate of the PTFE medium.
With its high porosity, Trimetric GKD now offers a filter medium that combines all the positive characteristics of existing proven filter types in one medium. This four-layer product combines three different filter media (including metal non-woven fabrics) into a high-performance filter for hot air filtration.
As a sintered filter media laminate, Trimetric is based on GKD's proven process for the production of mesh laminate Gekuplate and the results of IMVT research. Studies have shown that the combination of the metal fiber nonwoven fabric on the outflow side and the optimized Dutch weave on the inflow side is unparalleled in terms of cleaning and filtration efficiency.
The high dirt holding capacity of this combination ensures a slow increase in pressure loss and high separation efficiency. With a temperature resistance of up to 600°C, laminates made of stainless steel media can also be used where polymer filter media no longer function. This material guarantees good weldability, thereby ensuring the necessary sealing between the raw gas side and the clean gas side. Due to its support structure, the self-supporting filter element does not require a support basket. For cleaning, the filter cake is separated from the rigid filter media by reversing the local pressure difference. The long service life brought by the excellent reproducibility of Trimetric filter elements is the basis for long-lasting and reliable operation.
Unlike ceramic filter elements, filter elements made of Trimetric can also be cleaned on the outside of the filter housing with a high-pressure cleaner, allowing them to be reused multiple times. This mechanical stability usually makes them far superior to ceramic filter elements: Trimetric filter elements can even withstand the vibration stress caused by increased pulse pressure during cleaning or by bolted connections that are closed too tightly.
Generally speaking, there is no limit to the filter length of this new filter medium: the required format consists of segments up to 900 mm long, which are installed specifically for the application and do not require tools or expensive molds. Therefore, defective individual segments can also be repaired or replaced at any time. The outer diameter of Trimetric filter media can be individually selected from 60 to 600 mm, and the standard is cylindrical. But in principle, square or any other geometric shapes are also possible. This modularity allows Trimetric filter media to be used in all economic designs of standard dust filters.
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