What is the gas/oil consumption of a 2t/h steam boiler?

Water temperature: 20℃, Pressure: 1.25Mpa, thermal efficiency:98% (high-efficiency 2t/h steam boiler). The gas consumption is 136-145 m³ and the oil consumption is 122-130 kg/h.

1. 2 t/h Steam Boiler Operating Conditions

• Feedwater temperature: 20 °C

• Saturated‐steam pressure & temperature: corresponds to 194 °C

• Boiler thermal efficiency: 98 % (LHV basis)

2. Thermodynamic Basis

Each kilogram of water must be heated from 20 °C liquid to saturated steam at 194 °C. From steam‐table data:

• Enthalpy of liquid water at 20 °C, h₁ ≈ 84 kJ/kg

• Enthalpy of vaporization at 194 °C, h_fg ≈ 1 957 kJ/kg

• Enthalpy of saturated liquid at 194 °C, h_f ≈ 827 kJ/kg

Total steam enthalpy at 194 °C is h₂ = h_f + h_fg ≈ 2 784 kJ/kg.

Thus the specific enthalpy rise:

Δh = h2​−h1​ = 2784−84 = 2700 kJ/kg

At a mass flow of 2 000 kg/h (2 t/h), the net steam heat duty is:

Q˙out = 2000 kg/h × 2700 kJ/kg = 5.40×10^6 kJ/h  (1.50 MW)

3. 2t/h Steam Boiler Fuel Consumption

3.1. Fuel Input Requirement

Accounting for 98 % efficiency:

Q˙in = (5.40×10^6) / 0.98 ≈ 5.51×10^6 kJ/h

3.2. Natural Gas Consumption

Using an LHV of 38.1 MJ/m³ for typical natural gas:

V˙gas = (5510 MJ/h) / (38.1 MJ/ m³) ≈ 145 m³/h

3.3. Fuel Oil Consumption

Using an LHV of 42.5 MJ/kg for light fuel oil:

m˙oil = (5510 MJ/h) / (42.5 MJ/kg) ≈ 130 kg/h

Summary (Ordinary Boiler):

• Gas: ~145 m³/h

• Oil: ~130 kg/h

4. Condensing Steam Boiler – Euro7

To capture additional energy from flue‐gas condensation, the Condensing Steam Boiler – Euro7 employs an integrated economizer and high‐efficiency burner. On an LHV basis, it achieves up to 103.8 % thermal efficiency by recovering latent heat.

4.1. Fuel Input Requirement at 103.8 % Efficiency

Q˙in,Euro7 = (5.40×10^6 )/ 1.038 ≈ 5.20×10^6 kJ/h

4.2. Fuel Consumption

• Natural gas:

  V˙gas,Euro7 = (5204 MJ/h) / ( 38.1 MJ/m³) ≈ 136 m³/h

• Fuel oil:

  m˙oil,Euro7= (5204 MJ/h) / (42.5 MJ/kg) ≈ 122 kg/h

Summary (Euro7 Condensing Boiler):

• Gas: ~136 m³/h

• Oil: ~122 kg/h

• Efficiency: up to 103.8 % (LHV)

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5. Comparative Benefits

• Fuel cost reduction: Lower hourly consumption directly cuts fuel expenses.

• Emission reduction: Less fuel burned yields fewer CO₂ and NOₓ emissions.

• Condensing advantage: Heat recovered from exhaust boosts efficiency beyond 100 % on an LHV basis.

6. Conclusion

For a 2 t/h saturated‐steam requirement (20 °C → 194 °C):

• A 98 %‐efficient boiler needs ~145 m³/h of natural gas or ~130 kg/h of fuel oil.

• Upgrading to the Condensing Steam Boiler – Euro7 reduces consumption to ~136 m³/h of gas or ~122 kg/h of oil, achieving up to 103.8 % efficiency by recovering latent heat.

The calorific value of fuel varies from region to region. This will lead to different results. If you need to calculate the fuel cost accurately, you can send us your fuel test report. As a Class A boiler manufacturer, we provide you with free services including cost calculation, boiler room design, gas consumption calculation, etc.

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