Factors affecting the outlet temperature of the boiler furnace

1. Impact of boiler load: An increase in boiler load requires more coal and air to be supplied, which raises the bed temperature and consequently the temperature at the furnace exit.
2. Impact of fuel when the load remains constant: (1) An increase in the volatile content of the coal means that most of the volatiles burn in the upper part of the furnace, leading to an increase in the temperature at the furnace exit. (2) An increase in the proportion of fine particles in the coal results in more combustion in the dilute zone of the furnace, again causing the temperature at the furnace exit to rise.
3. Impact of primary air when the load remains constant: An increase in the amount of primary air causes the flame center to move upward, resulting in an increase in the temperature at the furnace exit.
4. Impact of the amount of recycled ash when the load remains constant: A decrease in the amount of recycled ash leads to an increase in the bed temperature, and thus an increase in the temperature at the furnace exit. Impact of feedwater temperature when the load remains constant: An increase in feedwater temperature reduces the heat absorbed from the furnace, leading to an increase in the bed temperature and consequently an increase in the temperature at the furnace exit

I forgot to mention that it’s a 135MW coal powder furnace

Boiler load, coal feeding rate, air supply volume, feedwater temperature

Boiler load, increased fuel supply, increased air supply volume, feedwater temperature, scaling on the water wall tubes

Boiler load, increase in fuel quantity, increase in air supply volume, feedwater temperature, scaling on the water wall tubes; it also includes coal powder fineness, the level of volatiles in the coal powder, and how the air distribution affects the flame center