7
7.1.4
Automatically Triggering Extinguishing
System for the Burner Auger = ATEBA
A water extinguishing system on the feed auger is
available as an option.
This device is used to reliably prevent any back
burn in case of a malfunction (such as a power
failure). For safety reasons and to prevent any
damage caused by overflowing, connecting this
extinguishing device directly to the water supply
network is not advised.
This extinguishing device is always equipped with
a 25-litre container for extinguishing water with a
float-type level-control switch and an adjustable
Danfos extinguishing valve.
According to TRVB 118, the container for the
automatically triggering extinguishing device must
be equipped with a level monitoring system.
If there is a shortage of water, the PYROMAT DYN
will switch off automatically. In case of excess
temperature, the feed auger will be flooded reliably
but to a limited degree.
The installing heating engineer should carry
out the pipework for the automatically trigger-
ing extinguishing system for the burner auger
in accordance with Spec Sheet 4550.
7.2
Back-burn safeguard for the fuel
supply system
The further "back-burn safeguard for material
transport" depends on the respective requirements
(position and size of the fuel storage unit, material,
pressure conditions and regulations), these being
separate items of the scope of delivery ordered
with Köb Holzheizsysteme GmbH according to the
following descriptions.
7.2.1
Automatically Triggering System for the
Material Supply System (ATSMS)
Approved in part as a variation to the slide valve in
non-pressurised fuel storage units (does not meet
TRVB).
The installation of the Automatically Triggering
System for the Material Supply System
(ATSMS) should be carried out by the installing
heating engineer according to Spec Sheet
4550.
7.2.2
Slide valve, type MBA
This is approved in non-pressurised fuel storage
units for all cases and according to TRVB 118 (test
certificate BV 2979/89) is considered as a suitable
back-burn safeguarding device.
7.2.3
Rotary valve, type MBS
If the remnant wood is put into the fuel storage
space with blowers, then due to the pressurisation,
at least one rotary valve is required between the
fuel storage unit and the burner to reduce the
pressure. A rotary valve is suited for reducing the
pressure and according to TRVB 118 (test certifi-
cate BV 2979/89) is also considered as a suitable
back-burn safeguarding device.
Max. permissible excess pressure in the fuel
storage unit: + 500 Pa
Max. permissible negative pressure in the fuel
storage unit: + 0 Pa
7.2.4
Double rotary valve with pressure com-
pensation
If, due to special circumstances, any mechanically
induced negative pressures or extraordinarily high
excess pressures are to be expected in the fuel
storage unit, then two rotary valves with a pressure
compensation line leading outdoors should be built
into the material transport route according to the
respective project plan.
Max. permissible excess pressure in the fuel
storage unit: + 3000 Pa
Max. permissible negative pressure in the fuel
storage unit: - 3000 Pa
You should have the maximum pressures to be
expected confirmed by the supplier of the chip
suctioning system.
The rotary valve beneath the silo extraction system
may become leaky due to wearing of the sealing
elements or due to large pieces of wood not able
to be conveyed. Any such leakiness may make it
possible for low-temperature gases to flow back
from the firing furnace into the silo.
A smoke gas alarm should be installed between
the revolving valve and the silo extraction system,
which when triggered will disconnect the system
causing the negative silo pressure.
7.3
Fire protection for the fuel storage
unit
The measures necessary for this are never a part
of the Köb Holzheizsysteme GmbH scope of deliv-
ery.
In this regard, the conditions set by the local
building authority must be met by the operating
organisation.
