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)
Up to 500 TPH
D-Type Boilers - THERMSTAR

D-Type Boilers (THERMSTAR)

Delivers efficient, reliable steam generation with compact design and proven multi-fuel firing capabilities

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THERMSTAR features two-drum design for robust water circulation and high steam purity.

THERMSTAR is a robust bi-drum, D-type water tube boiler engineered for high-pressure steam generation. Its membrane wall design, large radiant furnace, and efficient convective heating surfaces ensure high thermal performance and reliability. Suitable for oil, gas, or multi-fuel firing, it offers fast load response, low maintenance, and compact footprint.

Technical data

  • Product capacity/performance range –

    • Capacity: Up to 500 TPH

    • Pressure: Up to 110 kg/cm2 (g)

    • Temperature: Up to 520ºC

  • Fuel type or energy sources – Natural Gas, Hydrogen Gas, Biogas, Syn Gas, Blast Furnace gas, Coke Oven Gas, Purge Gas, Light Fuel Oil, Heavy Fuel Oil, Residue Oil, HSD, LDO, Naphtha, Waste Gas, Tar etc.

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

  • Design – 

  • Bi-drum configuration

  • Field-erected / Fully modularised (plug-&-play modules)

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

Product features

Flexible variants: Field-erected, modular, or plug & play
Available as field-erected, modular, or plug & play variants to match site transport limitations and installation needs
Multi-fuel compatibility
Supports a wide range of fuels like light oils, heavy oils, and gases for operational flexibility
High-quality, fully automated membrane panel construction
Built with advanced, fully automated membrane panel construction, these boilers ensure superior quality, durability, and a gas-tight seal
Demister pads for high steam purity
Integrated demister pads effectively remove moisture, guaranteeing high steam purity crucial for protecting downstream equipment
Higher turndown ratio for operational flexibility
A higher turndown ratio provides exceptional operational flexibility, allowing the boiler to efficiently adapt to wide fluctuations in steam demand
Convenient burner cleaning with steam purging
Easily maintain burners with a convenient steam purging provision, ensuring consistent performance and minimising downtime
Higher thermal efficiency with bare/fin tubes
Achieve higher thermal efficiency through the strategic incorporation of bare and/or fin tubes, maximising heat absorption
Conservative heat release rates for reliability and longevity
Conservative heat release rates ensure reliable operation and significantly extend the boiler's overall service life
Convective superheaters with complete draining
Includes a complete draining provision, preventing corrosion and ensuring long-term reliability
Minimum refractory use to reduce thermal inertia
Minimal refractory usage effectively reduces thermal inertia, allowing for quicker startup and more responsive load changes
Provision for furnace water washing and inspection
Includes dedicated provisions for furnace water washing and thorough inspection, simplifying cleaning and maintenance procedures
Burner inspection port and furnace access manhole(s)
Equipped with a burner inspection port and convenient furnace access manhole(s) for easy monitoring and internal maintenance
Up to 96% on LHV Up to 520º C Up to 110 kg/cm²(g)
Up to 500 TPH
Single-Drum High Capacity Radiant Boilers

Single-Drum High Capacity Radiant Boilers

Delivers high-capacity, reliable steam for power and industrial process applications while ensuring optimal combustion and low emissions

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TBWES single-drum high capacity radiant boilers are offered as fully modular plug-and-play units or as partially modular components.

Optimised for high-pressure, high-temperature steam, these boilers feature a large radiant furnace, optimised circulation, and superior heat transfer. A large furnace, leak-proof membrane walls, and steam-cooled superheater supports enhance efficiency and durability, minimising maintenance with low refractory usage. Their compact, modular design ensures easy installation and maintenance, while offering exceptional load response, fuel flexibility, and operational reliability, ideal for continuous, high-demand steam environments.

Technical data

  • Product capacity / performance range –

    • Capacity: Up to 500 TPH

    • Pressure: Up to 160 kg/cm2 (g)

    • Temperature: Up to 560ºC

  • Fuel type –  Natural gas, hydrogen gas, biogas, syngas, blast furnace gas, coke oven gas, purge gas, light fuel oil, heavy fuel oil, residue oil, HSD, LDO, naphtha, waste gas etc.

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

  • Design – 

  • Single-drum configuration simplifies the construction and maintenance of boilers

  • Available in full plug-and-play configurations or as partially assembled modules

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

  • Other technical information – Radiant heat transfer: Heat is primarily transferred via radiation from the high-temperature furnace gases to the waterwalls, a process highly efficient due to the substantial temperature differential

Product features

100% skid-mounted plug & play design
Ready-to-install boiler system enables quick deployment and minimal on-site setup
Multi-fuel compatibility
Supports a wide range of fuels – light oils, heavy oils, and gases – for operational flexibility
Fully drainable, horizontal and convective superheater
Ensures no water pockets remain, preventing corrosion and thermal stresses for extended operational life and consistent performance
Front wall firing for fuel versatility
Allows the boiler to efficiently combust a wide range of liquid and gaseous fuels, either individually or blended, offering significant operational flexibility
Steam drum outside flue gas path
Positioning the steam drum away from the direct hot gas flow enables rapid heating and cooling cycles, facilitating quicker boiler startup and more responsive load changes
Large furnace size
A generously sized furnace provides ample space for complete combustion of fuels, which helps to reduce emissions and ensure efficient operation
Leak-proof membrane wall design
Utilises a fully welded membrane wall construction, creating an airtight and gas-tight enclosure that prevents leaks and enhances boiler efficiency and safety
Steam-cooled superheater supports
Integrating superheater supports into the steam flow path keeps them cool, protecting them from high temperatures and significantly increasing their lifespan and overall boiler reliability
Low refractory and reduced maintenance
Minimising the use of refractory materials within the boiler design leads to fewer potential points of failure and significantly lowers the frequency and cost of maintenance
Up to 96% on LHV Up to 560°C Up to 160 kg/cm²(g)
Subscribe to Up to 500 TPH

Registered Office Address

D-13, MIDC Industrial Area,
R. D. Aga Road, Chinchwad,
Pune 411019, Maharashtra, India

Corporate Office Address

Thermax Limited
Thermax House,
14 Mumbai-Pune Road, Wakdewadi,
Pune 411003, Maharashtra, India

Corporate Identity Number

L29299PN1980PLC022787

Toll Free Number

1800-209-0115

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