Daily Question (October 11)

The factors that affect combustion efficiency during operation are numerous and complex; the main ones include the following: deterioration in fuel quality, such as a decrease in volatility and an increase in moisture and ash content, which affects the ease of ignition of the fuel as well as its combustion stability. Additionally, there is the layout of the boiler and the arrangement of the burners (in a quadrilateral pattern)

The factors that affect combustion efficiency during operation are numerous and complex; the main ones include the following: (1) Deterioration of fuel quality, such as a decrease in volatiles and an increase in moisture and ash content, which leads to poorer ignition and combustion stability of the fuel as well as a reduced degree of complete combustion. (2) The fineness of the coal powder increases, and its uniformity decreases. (3) The air volume and air distribution ratio are unreasonable; for example, the excess air coefficient is either too high or too low, the ratios or speeds of primary and secondary air are not appropriately matched, and the mixing of primary and secondary air occurs too slowly. (4) Slagging or burnout at the burner outlet causes the airflow to deviate, leading to incomplete combustion. (5) High air leakage in the furnace and coal grinding system leads to a drop in furnace temperature, affecting the safe combustion of fuel. (6) The boiler load is too high or too low. When the load is too high, the fuel stays in the furnace for a shorter period of time ； When the load is too low, the furnace temperature drops and the air supply conditions are not optimal, both of which affect the complete combustion of the fuel. (7) Blockage of the cyclone separator in the pulverization system increases the amount of coal powder carried by the tertiary air, leading to increased losses due to incomplete combustion. (8) The powder feeder is not functioning properly, resulting in uneven powder discharge.

3# LZ Gas Station, take a look and learn* from it

Answer: Factors affecting combustion efficiency: 1. Velocity of primary air; 2. Velocity of secondary air and the timing of its introduction; 3. Operation of the coal feeding and grinding systems; 4. Temperature levels inside the furnace; 5. Properties and type of fuel; 6. Fineness of coal powder; 7. Excess air coefficient; 8. Cleanliness of the heating surfaces; 9. Operation status of the burners

Fuel, excess air coefficient, load variation

Take a look, learn some knowledge about boilers

Ash carbon content, flue gas oxygen content