Rotary Valve; Double Rotary Valve With Pressure Compensation System; Fire Protection For The Fuel Storage Space; Commissioning - KOB PYROT KRT SERIES Assembly And Installation Instructions Manual

7.2.3

Rotary valve

If remnant wood is moved into fuel storage spaces
with fans, then, in order to reduce pressure ap-
plied, at least one rotary valve is necessary to re-
duce pressure between the fuel storage unit and
the furnace. The rotary valve is suited to reduce
pressure and at the same time is considered ac-
cording to TRVB 118 (test certificate BV 2979/89)
as a suitable safeguard against back-burn.
Max. overpressure allowed in fuel storage unit:
+500 Pa
Max. negative pressure allowed in fuel storage
unit: +0 Pa
7.2.4 Double rotary valve with pressure com-
pensation system
If, due to special circumstances, any mechanically
produced negative pressures or extraordinarily
high overpressures are expected in the fuel stor-
age unit, then two rotary valves must be installed
in the material transport route according to the re-
spective project plan with a pressure compensa-
tion line to the outdoors.
Max. overpressure allowed in fuel storage unit:
+3000 Pa
Max. negative pressure allowed in fuel storage
unit: -3000 Pa
One must have the supplier of the chip suction-
ing system confirm the maximum pressures to
be expected.
The rotary valve below the silo extraction system
can become leaky due to wear of the sealing ele-
ments or through large pieces of wood that cannot
be conveyed. This leakage can make it possible
for low-temperature gases to flow back from the
furnace into the silo.
A smoke gas alarm must be installed between the
rotary valve and the silo extraction system, which,
when triggered, will disconnect the system causing
the negative pressure for the silo.
7.3 Fire protection for the fuel storage
space
The measures necessary for this are never part of
the scope of performance from KÖB Holzfeuerun-
gen GmbH.
The conditions set by the local building au-
thorities must be met by the operating organi-
sation in this connection.

8 Commissioning

Only KÖB Holzfeuerungen GmbH or another
trained specialist may put a newly installed facility
into operation for the first time.
Before the facility is commissioned, the system
must be filled with water, fuel stored for the com-
missioning and the installation inspected.

8.1 Filling the heating system

The first filling is usually carried out with untreated
water without any chemical water treatment but
definitely filtered and thus free of any suspended
solids.
Pay special attention when the filling is carried out
to be sure the air is carefully bled out. With difficult
water conditions (high degrees of hardness, etc)
and/or large volumes of water, comply with VDI
Guideline 2035 "Preventing Damage through Cor-
rosion and Scale Formation in Hot Water Heating
Systems" by using appropriate measures for water
treatment.
Note: The filling pressure of the cold water re-
serve should be approx. 0.1 bar greater than
the supply pressure of the closed expansion
tank.

8.2 Fuel for the commissioning

For the commissioning, dry fuel (max. W 20%)
should be stored in an amount for approx. 10-24
full operating hours.
This is as follows:
PYROT 100
PYROT 150
PYROT 220
PYROT 300
PYROT 400
PYROT 540
Since the boiler plant is cold, and the residual
moisture will also be drawn from the refractory
concrete during the initial operation, the material to
be burned for the initial operation has to be at least
air dry. The heating-up process should be carried
out during the first three hours at low output.
To check the functioning of the silo extraction sys-
tem, not too much material to be burned should be
stored so as to be able to quickly clear out the ex-
traction system to remedy the cause of any mal-
function there might be.
5
approx 800 kg
approx 1200 kg
approx 1500 kg
approx 2000 kg
approx 2500 kg
approx 3000 kg