Design Boiler considerations

In order to evaluate performance and improve design, boilers often undergo heat balance tests. The method of calculating boiler thermal efficiency directly from the effective use of energy is called positive balance, and the method of inversely calculating efficiency from various heat losses is called inverse balance.

When considering the actual benefits of the boiler room, not only the thermal efficiency of the boiler must be considered, but also the energy consumed by the auxiliary boiler. When the fuel per unit mass or unit volume is completely burned, the air demand calculated by the chemical reaction is called the theoretical air volume. In order to make the fuel in the furnace have more opportunities to contact with oxygen and burn, the actual amount of air sent into the furnace is always greater than the theoretical amount of air. Although feeding more air can reduce the heat loss of incomplete combustion, the heat loss of flue gas will increase, and it will also increase the corrosion of sulfur oxides and the formation of nitrogen oxides. Therefore, we should try to improve the combustion technology, and strive to make the combustion in the furnace complete with the smallest possible excess air coefficient.