Up to 500 TPH
Lean Gas Fired Boilers

Lean Gas Fired Boilers

TBWES offers single-drum and bi-drum lean gas-fired boilers in packaged or field-erected options for various industrial applications

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Lean gas-fired boilers utilise combustion of low-calorific fuels such as blast furnace gas (BFG), coke oven gas (COG) or other lean gases.

The boilers exhibit high reliability despite the challenging properties of the gas, including its slow-burning behaviour, low calorific value, and limited combustibles. They feature indigenously built burners, refractory-lined furnaces, and advanced safety interlocks. Their robust design ensures stable combustion, automatic fuel switchover, and oil-free operation between 60–100% MCR, even under fluctuating gas conditions and load variations.

Technical data

  • Product capacity / performance range

    • Capacity: Up to 500 TPH

    • Pressure: Up to 175 kg/cm2 (g)

    • Temperature: Up to 560ºC

  • Energy sources – Blast furnace gas (BFG), coke oven gas, Corex Gas, LD gas and other lean gases

  • Compliance or standards followed – ASME / IBR / TRCU / PED

  • Design – 

  • Single-drum and bi-drum configurations

    • Field-erected / partially modularised

    • Designs offered are with refractory lined combustor or with an integral furnace

  • Flexibility or customisation options
    The product can be customised based on customer needs or scale

  • Other technical information - Boiler-Turbine-Generator (BTG) package can be offered on case-to-case basis

Product features

Multi-fuel compatibility
Supports a wide range of fuels – BFG, coke oven gas, corex Gas, LD gas and other lean gases for operational flexibility
Excellent efficiency
89% on NCV
Robust design for low-calorific fuels
Designed for the dependable combustion of low calorific value fuels
Automatic fuel switching
Automatically switches to oil firing upon interruption of BFG supply
Large furnace for low heat release
Features a larger boiler furnace for a low volumetric heat release rate to ensure better temperature control and reduced slagging
High-efficiency burner
Specialised burners ensure high mixing energy of air and BFG for complete combustion
Advanced safety interlocks
Built-in safety interlocks for proper BFG burning without support fuel
BFG variation tolerance
Tolerates variations in BFG pressure, flow, and calorific value
Refractory-lined furnace with scroll burner
Refractory lining and scroll burner enhance combustion stability and fuel-air mixing
Safe load variation handling
Ensures safe boiler operation even under fluctuating load conditions
COG-based startup, without LDO
Starts efficiently on coke oven gas (COG) without requiring light diesel oil (LDO)
Zero support fuel operation
Operates without oil/gas support in the 60-100% maximum continuous rating (MCR) range
Up to 560°C Up to 175 kg/cm²(g)
Subscribe to Up to 175 kg/cm²(g)