Emission measurment
70
© Solarbayer GmbH [210205]
14
EMISSION
MEASURMENT
Boiler and system damage due
to inadequate heat transfer.
Insufficient heat transfer leads
to shutdown of the exhaust
blower, to release of the thermal
drain safety device and possibly
to boiler damage.
Provide a sufficient heat
transfer
during
boiler
operation for emission
measurement.
14.1
Measurement notes
The emission measurement, below referred to as
measurement, has to be carried out with clean,
unpolluted and dry logs. The fuel must conform to
the properties specified in the documents (length,
size, wetness, etc.). The combustion process must
not be disturbed during the measurement.
Disturbances in the combustion process are:
Dirty (e.g. treated, painted, with earth
deposits) or wet firewood
Open the boiler doors
Stoking the fuel
Switch off the exhaust blower
The failures mentioned are reflected in the
measurement result, falsify it and possibly lead to
the loss of the operating licence. We recommend
cleaning the boiler thoroughly 1 to 3 days in
advance.
14.2
Preparing the measurment
The measurement must be carried out at a
measurement port in a straight exhaust pipe. The
distance from the exhaust gas connection to the
measurement port must be twice the exhaust gas
pipe diameter. Bends and deflections in the
exhaust pipe between the exhaust connection and
the measurement port falsify the measurement
result.
The following conditions must be observed for
emission measurement:
enough combustion air
enough suitable fuel
enough heat transfer
14.3
Creating a measurement
condition (continuous
operating state)
Heat the boiler following the instructions.
Create an glowing bed with a sufficient
amount of wood (approx. ¼ edition).
Burn off the fuel support.
Check that the operating conditions are
observed:
Minimum return temperature 65 °C
Chimney draft is permanently within the
allowed range
The draft control valve is set to the correct
value according to the installation
instructions
The exhaust gas temperature is inside the
allowed range
Fill the boiler with the maximum allowed
amount of fuel according to the instructions.
Wait at least 5 minutes until the combustion
process has built up and the steady state
described below has been reached:
Buffer loading pump is permanently in
operation (switch-on temperature)
Permanent boiler temperature of at least
80 °C
Exhaust gas temperature is within the
allowed range.
14.4
Performing a measurment
The measurement must be carried out in the core
flow of the exhaust gas for 15 minutes during
undisturbed
continuous
operation.
The
measurement must be carried out with a measuring
instrument that can calculate an average value
from the measurement process. Alternatively, an
estimate can be made. For this purpose, 15
continuous one-minute measurements must be
carried out, from which an average value is then
calculated.
The exhaust gas temperature
displayed
on
the
boiler
controller does not have to
match that at the measuring
port. Since the exhaust gas
temperature for boiler control is
often measured at a different
location, the temperatures
displayed
may
vary
considerably.
