Despite slow economic growth, infrastructure development has continued to fuel the demand for cement in many African countries. The cement industry is responsible for an estimated 5% of the world’s greenhouse gases released into the atmosphere, so cement companies are constantly looking for solutions to meet or exceed current and future emissions regulations.
Since the early 1970’s, Donaldson Filtration Systems have been used by cement producers such as PPC, AfriSam, Lafarge, Sephaku Cement (a subsidiary of Dangote Cement) and NPC. The company has continued to add to its range of products, introducing solutions that capture velocities high enough to eliminate emissions but low enough not to pull valuable product out of the production stream.
The Donaldson Torit Dalamatic series of dust collectors, for example, deliver a powerful solution for nearly any dust filtration application. These collectors are available in different sizes and come in two models: the Dalamatic Cased (DLMC) which is a standalone collector that can be ducted to many different applications and the Dalamatic Insertable (DLMV), a versatile collector that can be inserted into various applications such as bins, silos, bunkers, storage vessels or transfer points.
Both models are continuous-duty dust collectors designed to handle the most difficult product recovery applications. Envelope-shaped bags maximise the amount of media in a given space and provide continuous filtration of high dust concentrations even with small filter surfaces.
The company’s Modular Baghouse dust collectors are not only suitable as new systems, but are also ideal for retrofitting or converting existing dust collectors due to their modular design. Their sectional design allows for a variable filter bag assembly with tiered filter lengths for each section. High level dust inlets guarantee an effective separation even with difficult dust and high raw gas concentrations as well as with a low differential pressure.
In addition to the extensive Donaldson range of bag filter units such as flat bag and tubular bag technology, Donaldson also offers a complete range of cartridge filter units. With technologies like the new Donaldson Downflo Evolution (DFE) cartridge dust collector, PowerCore dust collectors and highly efficient filter media like Ultra-Web, Dura-Life and Textratex, Donaldson can guarantee lower emissions, a cleaner environment and higher efficiency when compared to current filter media in the market.
The DFE’s dust collection performance is achieved through a combination of design features like the Intelligent Drop Out Zone. This is where pre-separation of heavy dust particles takes place, resulting in the reduction of dust load on to the filter media, lower pressure loss, and minimal filter element abrasion.
The MaxPulse Cleaning System results in improved filtration capacity without sacrificing filter life or taxing compressed air consumption. Typical pulse-jet cleaned dust collectors deliver only a fraction of the compressed air energy to clean the filtration media by comparison. The MaxPulse Cleaning System minimises energy loss by focusing on the cleaning air’s exact path and delivers uniform cleaning energy to all effective filtration media.
Similarly, PowerCore dust collection technology from Donaldson outperforms traditional baghouse collectors and does so in less space, according to the company. The PowerCore dust collector handles high airflow, high grain loading, challenging particulates and fits into small places. It combines filter packs with a new proprietary compact pulse cleaning system, delivering high filtration efficiencies not usually found in baghouse filtration.
PowerCore dust collectors are available as stand-alone models that can be ducted to many different applications, as well as bin vent models used on applications like silos, conveyor transfer points, conveyor discharges, blenders and mixers. Compared to traditional baghouse collectors with similar airflow capacities, PowerCore CPC dust collectors are up to 50% shorter and the CPV bin vent collectors are almost 70% shorter than other bag-style bin vents.