What is the maximum energy efficiency of a boiler?

FangKuai’s dual‑stage condensing vacuum boiler delivering up to 112% LHV thermal efficiency, 20 °C exhaust, ultra‑low emissions, compact footprint, and sub‑1‑year ROI.

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Key Specifications at a Glance

Why This Table Matters

• Capacity Range from 700 kW to 4,200 kW covers small to large facilities.

• Consistent 20 °C Exhaust across all models underlines the effectiveness of dual‑stage condensation.

• Compact Footprint maximizes boiler‑room space efficiency—ideal for retrofit projects.

1. Dual‑Stage Condensation Process

1. Primary Heat Exchanger

   • Recovers the bulk of flue‑gas latent heat.

   • Lowers exhaust temperature to about 50–60 °C.

2. Deep‑Cryogenic Unit

   • Further cools exhaust down to 20 °C, maximizing latent‑heat recovery.

   • Produces condensate suitable for boiler feedwater, reducing makeup‑water demand.

2. Precision Combustion & Heat Transfer

• Fully Premixed Flat‑Flame Burners deliver uniform, surface‑guided combustion for complete fuel burn and ultra‑low NOₓ emissions—no SCR required.

• Wing‑Tube Heat Exchangers are tailored to the load profile, ensuring fast, efficient, and stable heat transfer across all turndown ratios.

3. Vacuum‑Maintaining Patent

FangKuai’s Automatic Vacuum Maintenance Device (Patent ZL200820220548.7) continuously vents non‑condensable gases, preserving a deep vacuum that:

• Lowers exchanger saturation temperature

• Prevents fouling and performance drift

• Sustains peak efficiency under fluctuating loads

4. Environmental & Operational Highlights

• Ultra‑Low Emissions: Deep condensation traps CO₂, SO₂, and NOₓ in condensate—no downstream scrubbers needed.

• Condensate Reuse: Treated condensate feeds back into the boiler, cutting fresh‑water usage.

• PVC Chimney Option: Ambient‑temperature exhaust allows cost‑effective PVC flue installation.

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5. Rapid ROI & Scalability

• Payback in <1 Year: Annual gas savings up to 10,000 m³ per ton of steam.

• Modular Networking: Master/slave configuration lets you link multiple units for seamless part‑load optimization.

• Smart HMI & Cloud Option: Full‑color touchscreen with optional IoT/cloud monitoring for predictive maintenance and performance analytics.