Herz firestar Lambda 18 - Emission Measurement; Measurement Notes; Measurement Preparation; Establish Measurement Condition (Continous Operating State)

11
Emission measurement
30 Betriebsanleitung_firestar_18-40_Lambda_Englisch_V1.6
11 EMISSION
MEASUREMENT
Boiler – and construction damage
by insufficient heat consumption.
An insufficient heat consumption
leads to a shutdown of the ID-fan,
to a triggering of the thermal flow
protection and maybe to a boiler
damage.
 Provide adequate heat
consumption during boiler
operation for emission
measurement
11.1 Measurement notes
The emission measurement, hereinafter called
measurement, is carried out with clean,
uncontaminated and dry log wood. The fuel must
correspond to the properties (length, size,
humidity, etc.) which are specified in this
documentation. During the measurement, no
disturbance of the combustion process may occur.
Disturbances of the combustion process are:
 Dirty (e.g. treated, painted, earthed bond) or
wet log wood
 Opening of the boiler doors
 Poking of the combustion material
 Shutdown of the ID-fan
The mentioned faults are reflected in the
measurement result, distort it and perhaps lead to
a loss of the operating licence. We recommend
that the boiler is cleaned thoroughly 1 to 3 days
before.
11.2 Measurement preparation
The measurement must be performed on a
measuring opening in a straight flue gas pipe. The
distance from the flue gas connection to the
measuring opening must be twice of the flue gas
pipe diameter. Bows and bends in the flue gas
pipe, between the flue gas connection and the
measurement opening, distort the measurement
result.
The following conditions must be met for the
emission measurement:
 Enough combustion air
 Enough suitable fuel
 Enough heat consumption
11.3 Establish measurement
condition (continous
operating state)
 Heat up the boiler according to the
documentation
 Create a firebed with a sufficient amount of
wood (about ¼ pad)
 Burn off the fuel pad
 Make sure that the operating conditions are
met:
 Minimum back flow temperature 60°C
 Flue draft is always in the permitted
range
 Chimney draw controller is set to the
correct value according to the
installation instructions
 Flue gas temperature is in the permitted
range
 Load the boiler according to the installation
instructions with the maximum permissible
amount of fuel.
 Wait at least 5 minutes till the combustion
process has built up and the following
described steady state is reached:
 Buffer loading pump is permanently in
operation (Switch on temperature)
 Permanent boiler temperature at least
70°C
 Flue gas temperature moves within the
permitted range
11.4 Measurement performance
The measurement must be carried out in an
undisturbed continuous operation over 15 minutes
in the core flow of the flue gas. The measurement
must be performed with an instrument, which can
form an average from the measurement process.
Alternatively an approximate value can be formed.
For this purpose, 15 consecutive one-minute
measurements must be performed, from which an
average is calculated.
 The displayed flue gas temp-
erature on the control device
of the boiler must not cor-
respond with the flue gas
temperature of the measure-
ment opening. As the flue
gas temperature of the boiler
control is often measured at
a different point, the temp-
eratures can vary
considerable.