CleaverBrooks profire q, Установка, эксплуатация и обслуживание

Страница: 39 / 58

750-370
ProFire Q Series Manual 4-1
CHAPTER 4
Adjustments
4.1 — Overview
While each burner is tested at the factory for correct operation before shipment, variable conditions such as burning
characteristics of the fuel used and operating load conditions may require further adjustment after installation to assure
maximum operating efficiency.
Prior to placing the boiler into initial service, a complete inspection should be made of all controls, connecting piping,
wiring and all fastenings such as nuts, bolts and setscrews to be sure that no damage or misadjustments occurred during
shipping and installation.
A combustion efficiency analysis made during the initial start-up will help to determine what additional adjustments
are required in a particular installation.
4.2 — Combustion Adjustment on Gas
Efficient combustion cannot be properly judged by flame appearance, although it may help in making preliminary
settings.
The proper settings of air-fuel ratios must be determined by flue gas analysis. Combustion gas analysis indicates the air
to fuel ratio and the degree of complete combustion. Instruments are available to measure carbon dioxide (CO
2
),
oxygen (O
2
), and carbon monoxide (CO).
4.2.1 — Stack Temperature
Net stack temperature is obtained by subtracting the ambient temperature from the flue gas temperature. A high net
stack temperature indicates wasted heat. Stack temperature should be as low as possible without causing flue gas
condensation.
Stack heat loss can be reduced by decreasing either the temperature or the volume of the flue gas, or both. Flue gas
temperature is reduced by improving heat transfer or by reducing excess combustion air. A certain amount of excess air
is necessary to complete combustion. More efficient burners require minimum excess air.