The fuel consumption of a biomass steam boiler is essentially the heat required for steam production divided by (fuel calorific value × boiler thermal efficiency). The consumption is influenced by four major factors: the boiler itself, the fuel, the operating conditions, and the environment. The specific details are as follows:

1.Fuel itself factors (with the greatest impact
Lower calorific value of fuel
The lower the calorific value, the more fuel is consumed to achieve the same amount of heat.
Moisture content
Water absorbs heat and evaporates, reducing the effective calorific value and increasing the heat loss of flue gas. The higher the moisture content, the greater the consumption.
Ash and impurities
High ash content will reduce combustion efficiency and increase heat loss from incomplete combustion.
Fuel molding and particle size
Uniform particles, good density, and more complete combustion; Loose materials and powder materials are prone to incomplete combustion of fly ash.

2.Boiler Body and Configuration Factors
Rated thermal efficiency of the boiler
The higher the design efficiency, the less material is consumed under the same steam production volume.
Grate/Combustion method
The burnout rates of circulating fluidized beds, reciprocating grates, chain grates and hand-fired furnaces vary significantly.
Thermal insulation performance
Poor heat preservation leads to significant heat loss and increased power consumption.
The heating surface is covered with scale and ash
Heat exchange deteriorates, and more fuel needs to be burned to reach the rated steam parameters.
3. Operating Conditions Factors
Actual load rate
When operating at low loads, the efficiency of boilers usually decreases and the material consumption per unit of steam increases.
Steam pressure and temperature
The higher the pressure and temperature, the greater the latent heat of vaporization and superheat, and the more material is consumed.
Feed water temperature
The water supply temperature is low, and more heat is needed to heat it to the saturation temperature.
Combustion adjustment
Unreasonable air distribution and low furnace temperature can lead to incomplete combustion and increased consumption.
Pollutant discharge rate
Continuous and regular sewage discharge take away heat. The higher the sewage discharge rate, the more materials are consumed.
4.Environmental and Auxiliary System Factors
Ambient temperature, altitude
Heat dissipation is significant in low-temperature environments. At high altitudes, the air is thin, and combustion and heat exchange deteriorate.
Matching of induced draft and forced draft
Excessive air volume increases the heat loss of flue gas exhaust, while insufficient air volume leads to incomplete combustion.
Condensate water recovery and utilization rate
The more condensate water is recovered, the higher the feed water temperature and the lower the fuel consumption.
V. Summary (Key Ranking
Impact on consumption from largest to smallest:
Fuel calorific value and moisture content > Boiler thermal efficiency > Actual Load and operation adjustment > Blowdown and condensate recovery > Environment and insulation