How to reduce heat loss in utility boilers

In the daily application of power station boilers, heat loss is a large part of waste. The following analysis of several main heat loss methods and solutions in related aspects will greatly improve the efficiency of power station boilers, save resources, and avoid unnecessary waste.

The heat dissipation loss of the furnace body generally should not be higher than the ambient air temperature by 50°C on the surface of the furnace body.When the power station boiler is running, the surface temperature of the furnace wall, steel frame, pipes and other accessories is higher than the surrounding temperature, and the surface of the furnace body dissipates heat.The larger the outer surface area of ​​the furnace, the worse the thermal insulation performance and the greater the heat dissipation.
Mechanical incomplete combustion heat loss The mechanical incomplete combustion heat loss of power plant boilers is a major heat loss of power plant boilers.In the ash and slag discharged from the power plant boiler burning solid fuel and the fly ash carried out with the flue gas, there are unburned fuel particles and carbon particles.The heat stored in these unburned solids is called the mechanical incomplete combustion heat loss of the utility boiler.Mechanical incomplete combustion heat loss of liquid and gaseous fuels.
Other heat losses When burning solid fuels, the heat loss caused by the removal of ash, which also has a relatively high temperature, from the utility boiler is called ash physical heat loss.Other heat input losses of power plant boilers refer to cooling heat losses from physical heat losses carried by ash and slag.Some parts of the utility boiler absorb the heat of the flue gas on one side and are cooled by water or air on the other side.The heat taken away by water or air cannot be sent back to the utility boiler system for application, resulting in cooling heat loss of the utility boiler.
The size of the three heat losses is related to the amount of excess air.If the excess air coefficient is too large, the heat loss of exhaust gas will increase, but the heat loss of chemical incomplete combustion and the loss of mechanical incomplete combustion will be reduced accordingly; on the contrary, if the excess air coefficient is reduced, the heat loss of exhaust smoke will be reduced. But chemical incomplete combustion heat loss and mechanical incomplete heat loss increased.Therefore, the excess air coefficient when the sum of q2, q3, and q4 of the utility boiler is minimized is the optimal excess air coefficient.