Allied Environmental Technologies, Inc. had been developing a novel Multi-Stage Collector (MSC™) technology for ultra-high efficiency removal of the ultra-fine particulate matter. The MSC™ concept is a patented process (Krigmont, US Pat. 6,524,369 and US Pat. 6,932,857) that entails a unique integration of electrostatic precipitation and barrier filtration of particulate.
The principal objective of the MSC™ is to substantially improve fine particulate collection by combining both electrostatic charging/collection and filtration processes, not only by separating zones for particle charging and collecting, but, by providing a new unique collector design with improved efficiency to collect high resistance fine dust particles. MSC™ offers a uniquely compact concept (Figure 1) utilizing an upstream stage comprised of a generally conventional electrostatic precipitator followed by a downstream zone comprised of the parallel surfaces creating uniform electric field, followed by yet another stage which incorporates Barrier Filter (BF) the external surfaces of which provide a uniform electric field. The spacing between the discharge points (corona sources) and collecting surfaces are different, wider in the charging or corona generating zones and narrow in the collecting ones where a uniform high voltage electric field is required. This feature allows for the use of a single high voltage power source for all electrostatic fields (in all zones).
At sufficiently high field strength in this non - uniform field region, a corona discharge can take place between the electrode and the plates acting as an ion-charging source for dust particles passing through it (Figure 2). The center region of uniform field on the other hand acts in a manner similar to the field between parallel capacitor plates with charged dust particles collecting on the plates.
The applications of this technology span from utilities (collecting fly ash) to industrial applications where the interim product(s) recovery is of an outmost importance as well as for final emissions clean-up prior to the discharging exhaust gases to the environment. The proof-of-concept pilot (Figure 3 and Figure 4) have been tested on a small combustor at Fossil Energy Research (FERCO) laboratories and currently Allied Environmental Technologies, Inc. is developing a field demonstration unit. Up-to-date results are very encouraging.
Furthermore, in continuing developing the multi-stage approach further, recently we have received two more Patents: “Space Efficient Hybrid Collector” and “Space Efficient Hybrid Air Purifier” (Krigmont, US Pat. 7,582,145 and US Pat. 7,582,144). These are intended to target the heavy industrial engine/diesel emissions and the industrial/high-tech clean room environment respectively (of course, other uses would be also possible).
In addition, we developed the Multi Stage Wet Collector (MSWeC™) capable of extremely efficient controlling emissions to sub-micron level, including submicron particulates, condensed organics, gaseous acid compounds and heavy metals. The MSWeC™ is also a patented (Krigmont, US Pat. 7,597,750) hybrid wet device for removing chemical constituents, entrained sub-micron and nano-particulate material from a gas stream. The multi-stage collector is made up of concentric tubes or pipes with an internally formed gas path communicating between an inlet and an outlet (Figure 5). The Bubbling Jet Reactor (BJR) may be located between the first and second electrical stages to provide chemical treatment of the gaseous mists in addition to particulate filtration as the gas passes through the control device.
Multi-Stage Collector Technology
Multi Stage Collector (MSC™) Technology
Allied Environmental Technologies, Inc. had been developing a novel Multi-Stage Collector (MSC™) technology for ultra-high efficiency removal of the ultra-fine particulate matter. The MSC™ concept is a patented process (Krigmont, US Pat. 6,524,369 and US Pat. 6,932,857) that entails a unique integration of electrostatic precipitation and barrier filtration of particulate.
The principal objective of the MSC™ is to substantially improve fine particulate collection by combining both electrostatic charging/collection and filtration processes, not only by separating zones for particle charging and collecting, but, by providing a new unique collector design with improved efficiency to collect high resistance fine dust particles. MSC™ offers a uniquely compact concept (Figure 1) utilizing an upstream stage comprised of a generally conventional electrostatic precipitator followed by a downstream zone comprised of the parallel surfaces creating uniform electric field, followed by yet another stage which incorporates Barrier Filter (BF) the external surfaces of which provide a uniform electric field. The spacing between the discharge points (corona sources) and collecting surfaces are different, wider in the charging or corona generating zones and narrow in the collecting ones where a uniform high voltage electric field is required. This feature allows for the use of a single high voltage power source for all electrostatic fields (in all zones).
At sufficiently high field strength in this non - uniform field region, a corona discharge can take place between the electrode and the plates acting as an ion-charging source for dust particles passing through it (Figure 2). The center region of uniform field on the other hand acts in a manner similar to the field between parallel capacitor plates with charged dust particles collecting on the plates.
The applications of this technology span from utilities (collecting fly ash) to industrial applications where the interim product(s) recovery is of an outmost importance as well as for final emissions clean-up prior to the discharging exhaust gases to the environment. The proof-of-concept pilot (Figure 3 and Figure 4) have been tested on a small combustor at Fossil Energy Research (FERCO) laboratories and currently Allied Environmental Technologies, Inc. is developing a field demonstration unit. Up-to-date results are very encouraging.
Furthermore, in continuing developing the multi-stage approach further, recently we have received two more Patents: “Space Efficient Hybrid Collector” and “Space Efficient Hybrid Air Purifier” (Krigmont, US Pat. 7,582,145 and US Pat. 7,582,144). These are intended to target the heavy industrial engine/diesel emissions and the industrial/high-tech clean room environment respectively (of course, other uses would be also possible).
In addition, we developed the Multi Stage Wet Collector (MSWeC™) capable of extremely efficient controlling emissions to sub-micron level, including submicron particulates, condensed organics, gaseous acid compounds and heavy metals. The MSWeC™ is also a patented (Krigmont, US Pat. 7,597,750) hybrid wet device for removing chemical constituents, entrained sub-micron and nano-particulate material from a gas stream. The multi-stage collector is made up of concentric tubes or pipes with an internally formed gas path communicating between an inlet and an outlet (Figure 5). The Bubbling Jet Reactor (BJR) may be located between the first and second electrical stages to provide chemical treatment of the gaseous mists in addition to particulate filtration as the gas passes through the control device.
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Fig. 1: Conceptual MSC™ Design
Fig. 2: MSC™ Operation
Fig. 3: MSC™ Pilot - View from the Hopper
Fig. 4: Proof-of-Concept-Pilot
Fig. 5: Wet Multi Stage Collector (MSWeC™) Conceptual Arrangement
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