The formula to calculate the fuel consumption rate for a rice husk-fueled inclined grate furnace with a heat exchanger is:

\[ FCR = \frac{1000 \cdot BR \cdot A_g}{\xi_f \cdot \xi_{he}} \]

Where:

• \(FCR\) is the fuel consumption rate in kilograms per hour (kg/hr).
• \(BR\) is the burning rate in kilograms per hour per square meter (kg/hr-m²).
• \(A_g\) is the grate area in square meters (m²).
• \(\xi_f\) is the furnace efficiency (decimal).
• \(\xi_{he}\) is the heat exchanger efficiency (decimal).