Klimawent
– the warranty of highest quality at attractive price
4 z 16
Filtering unit
BIG-2000/Ex
02.10.2019
Fig. No.1
– BIG-2000/Ex – Flow chart
According to the 99/92/EC ATEX 137 Directive, manufacturer
carried out the classification of the internal and external zones,
connected with the explosion hazard during the operation
of the filtering unit.
In the
Fig. No.2
is presented the classification of the internal
zones. The chamber of filters and the hopper chamber along
with the waste container have been specified as
zone 20/21
,
because in these areas always and in long periods potentially
explosive atmosphere occurs.
Whereas, the regeneration chamber is classified as
zone 22
,
because the dust occurs in this area sporadically, in case of
failures consisting in damage of the cartridge filter or the filter
mounting.
External zones can be created:
while opening the inspection doors,
during the emptying the waste container.
They have been classified as
zone 22
.
Fig. No.2
– Classification ATEX – internal zones
STRUCTURE ADN FUNCTION
5.1
Structure
BIG-2000/Ex filtering unit consists of three functional assemblies:
Regeneration chamber, being the upper part of the device, where are located outlets from the cartridge filters and
Venturi Orifices. Outside the regeneration chamber is installed the compressed air installation, consisting of:
–
compressed air tank
– constructed for operational pressure not exceeding 0,8 MPa, the tank meets the re-
quirements of the
European Union Directive 87/404/EEG
and
90/488/EEG
;
–
two
electromagnetic valves of diameter 1”½, designed for regeneration of the cartridge filters, these valves
meet the requirements of directives:
ATEX 94/9/EC
and
EMC 89/336/EC
.
Chamber of filters
– forms the middle part of the filtering unit and contains the cartridge filters. On the chamber
housing is located the inspection door, (for filter replacement) and a decompression panel lowering the pressure
in case of potential explosion. Outside the chamber is installed a micro-controller
– to activate the electromagnetic
valves, (described in details in Section 7).
Supporting construction along with the hopper chamber. Underneath the hopper chamber is placed a waste
container of capacity 99 litres.