3 Stage Fine Dust Particle Separator CCA Mini
For solid fuel renewal up to 100 kW
Efficient reduction of fine dust in 3 stages
Easy cleaning and disposal of ashes
Avoiding operating costs
Active environmental protection in heat generation with domestic biomass
1st stage: Fine dust particle separation in ionisation chamber 1 with the 1st crescent-shaped spray electrode arranged transversely to the direction of flow.
2nd stage: Fine dust particle separation through space charge and sedimentation of the separated particles in the ash box
3rd stage: Fine dust particle separation in ionisation chamber 2 with the 2nd crescent-shaped spray electrode arranged transversely to the direction of flow
The health risks caused by fine dust are being discussed more and more frequently and intensively. The smaller the size of the particles, the bigger the danger for health (see fig. 1)
Therefore, all possibilities should be explored to reduce fine dust emissions as far as possible. The CO2-neutral combustion of regenerative biomass for heat generation produces fine dust which is effectively reduced by the use of fine dust particle separators. This is why the use of particle separators is promoted e.g. by the German Federal Office of Economics and Export Control.
The separation of fine dust particles from combustion exhaust gases is based on binding the particles through electrostatic charging. At the tip of a spray electrode, corona discharges at high applied voltage release charge carriers which ionise the gas molecules in the exhaust gas. The gas ions that form charge the dust particles. The charged particles migrate towards a collecting electrode and are separated in the form of agglomerated dust flakes.
The 3-stage particle separation (fig. 2)
Up to now, in the area of solid fuel renewals up to 100 kW, mainly single-stage particle separators are used, whose spray electrode is installed in the direction of flow. They use the downstream exhaust pipe or the metallic chimney as a large-area collecting electrode. In practice, this leads to frequent and cost-intensive cleaning of the collecting electrodes by a specialist company - up to twice a month during the heating season. Only timely cleaning ensures effective particle separation and prevents dust flake discharges with their unpleasant side effects such as dirty roofs or complaints about dust flake pollution on neighbouring properties. The compact particle separator CCA Mini with 2 ionisation chambers (2)(8), a vertically arranged separating plate (9) and an ash box (5) extends the single-stage particle separation by 2 further separation stages - the space charge and the 2nd corona discharge field - enables the collection of the particles in a removable ash box (5), which the operator can remove and clean himself. Thanks to the development of the 3-stage particle separation in the smallest space in a separate stainless-steel housing, high separation efficiency of up to 91% is possible even with smaller fireplaces. Additional, complex, and cost-intensive cleaning of the particle separator, the exhaust gas pipe and the chimney by a specialist company is no longer necessary.
In the first stage, the exhaust gas flows through the exhaust gas inlet (1) into the 1st ionisation chamber (2), which contains the glass insulator (11), the flexible insulator (12) and the high voltage wave (3). The first coarse dust particles are separated by the deflection and widening of the cross-section. An electric field is generated in the area of the 1st crescent-shaped sawtooth spray electrode (4) installed transversely to the direction of flow (see fig. 3). If the voltage is sufficiently high, corona discharges are triggered at each tip of the spray electrode. The electrons ionise the gas molecules. The resulting gas ions electrostatically charge the fine dust particles. The charged particles and agglomerates migrate towards the vertically installed separating plate (9) and the round wall of the ash box (5), which serve as precipitation electrodes, and are separated there. Already in the 1st stage the particle concentration is considerably reduced.
In the 2nd stage, the exhaust gases are deflected by 180° between the separating plate and the ash box bottom. Charged particles are separated in the ash box under the influence of space charge phenomena. The particle concentration is further reduced.
In the 3rd stage, the particles remaining in the exhaust gas - which have not yet been separated - are separated in the 2nd ionisation chamber (8) on the 2nd crescent-shaped spray electrode (7) mounted transversely to the direction of flow, are charged by the corona discharge, agglomerate and are separated. The exhaust gas cleaned in 3 stages leaves the particle separator through the exhaust outlet (10).
Condensate occurring in the starting phase and the humidity of the exhaust gas bind the deposited hygroscopic fine dust agglomerates, compress the ash, and increase cleaning intervals for the ash box.
The crescent-shaped sawtooth electrodes guarantee that the distance between the electrode tips on the straight side and the separating plate (A1), and between the convex side and the round inner surfaces of the ash box (A2) (fig. 3) will remain constant.
The control unit (15) with the high-voltage generator is mounted on the wall or in a control cabinet near the particle separator.
The control unit (15) takes over the control and monitoring. It consists of a high voltage generator, a processor part, the application related program as well as a power supply unit and a temperature sensor.
At a given exhaust gas temperature of e. g. 70°C the high voltage generator switches on. Depending on gas type, temperature, humidity, particle type and particle concentration, the operating voltage is regulated to ensure optimum separation.
Status and error messages are outputted on the displays. As is also the advice for the operator if cleaning of the ash box is necessary.
Fine Dust Particle Separator CCA Mini
✓ High separation efficiency of up to 91% through 3-stage particle separation
✓ Can also be used in front of ceramic and brick chimneys
✓ No additional costs for cleaning work by specialist companies
✓ Easy cleaning by the operator
✓ Simple disposal of ashes as residual waste
✓ Indicates when the ash box needs to be cleaned
✓ No use of moving parts such as fans, mechanical brushes, or injectors
✓ No water connections required
✓ No removal and re-installation of the particle separator during chimney sweeping
✓ Reliable fine dust measurement through spray electrodes protected in the housing
✓ Low power consumption
✓ Environmentally friendly and responsible heat generation with renewable biomass
✓ Personal active contribution to improving air quality and reducing pollution
✓ Promotion of innovation in old and new buildings and in retrofitting (BAFA)
✓ General technical approval/type approval Z-7.4-3537