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2 Description UTSK
The following measurements control the combustion process:
•
Primary air quantity
•
Secondary air quantity
•
Combustion temperature
•
Excess air measurement (Lambda)
•
Underpressure in the combustion chamber
The combustion grate is filled with refractory concrete.
•
To protect the steel structure
•
As thermal insulation
The combustion grate is insulated with 100 mm insulation mats covered by a sheet-
metal cladding in order to minimise radiation losses and as burn protection.
Hot water boiler
The hot flue gases from the combustion chamber heat the water in the boiler by means
of the boiler tube passes. The return line from the consumer runs underneath the unit.
The energy generated in the boiler system is distributed to the heating system from
above.
Stainless steel turbulators can be installed in the boiler tubes. They improve heat
transfer, thereby lowering the flue gas temperature to approximately 50°C. This
improves efficiency by about 3%.
The boiler is installed directly on the combustion system and equipped with the same
insulation and cladding. This reduces radiation losses.
Flue gas dedusting
Combustion of solids produces fly ash which is released in the hot flue gas.
The fly ash is normally separated out of the gas via multi-cyclones (centrifugal principle).
The result is a flue-gas reference value of less than 150 mg/Nm3 following separation.
The multi-cyclone is attached to the boiler and is also insulated and equipped with sheet
metal cladding together with the combustion grate/boiler.
Flue gas fan
The flue gas fan is especially designed for the respective system in accordance with the
order confirmation and the project planning documents. Additional information is given
in the separate instruction manual.
The flue gas fan extracts combustion gases through the boiler and the multi-cyclone and
conveys the gases to the flue gas pipe and then the stack.
D-20
Underfeed grate UTSK
1.10 en
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