Up to 400 TPH
AFBC Boilers

AFBC (Atmospheric Fluidised Bed Combustion) Boilers

Bubbling type AFBC boilers, offering efficient, cost-effective, reliable and viable alternative to conventional solid fuel-fired boilers for industrial applications

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TBWES AFBC boilers utilise bubbling fluidised bed combustion to efficiently burn fuels with high ash, metal content and high-alkali biomasses.

Fuel combustion occurs within a fluidised bed of crushed refractory or sand where an upward air stream ensures significantly higher degree of combustion completeness. This design allows for fuel flexibility, minimised slagging & fouling, high efficiency and significantly reduced emissions (including SOx control via limestone addition, eliminating FGD), leading to lower capital and operating costs.

Technical data

  • Product capacity / performance range –
    • Capacity: Up to 400 TPH
    • Pressure: Up to 140 kg/cm2 (g)
    • Temperature: Up to 560°C
  • Fuel type or energy sources – Coal, lignite, char, low ash coal, petcoke, paper sludge, washery rejects, roasted chaffs, de-oiled rice bran (DORB), biomass, bagasse, rice husk, spent coffee ground, spent tea waste, pith woodchips, coffee husks, mustard stalk, cotton stalk, sawdust, de-oiled bleach earth (DOBE), rice straw, etc.
     
  • Compliance or standards followed – ASME / IBR / TRCU / PED 
  • Design –
    • Single drum and bi-drum configurations
    • Field-erected / fully modularised (plug-and-play) configurations
    • Top or bottom supported
    • Suspension burning of fuel for higher combustion efficiency
    • Bubbling bed ash coolers
    • Two-stage steam separation
    • In-bed superheater
    • Stainless steel fluidising nozzles
    • Boiler bank without baffles
    • Riffle tube arrangement for in-bed evaporators
    Hopper bottom design* / fluid bed design is offered for specific applications:
    • Absence of moving parts reduces maintenance
    • Uniform temperature distribution and optimum combustion
    • Low excess air requirement results in higher efficiency
    • Lower NOx, SOx and CO emissions
    • Low temperature operation minimises the biomass fuel ash agglomeration and fouling tendency
    • Continuous slow draining of bed ash facilitates easy disposal of large particles, maintains optimal alkali concentration, and prevents dense particle accumulation, ensuring uniform bed density and consistent fluidisation
       
  • Flexibility or customisation options – The product can be customised based on customer needs or scale
  • Variants available - 
    Can be offered as:
    • Boiler island
    • Boiler-turbine-generator (BTG) package
    • Turnkey power plant (EPC)


    B&W
    Hopper bottom design is manufactured under license from Babcock & Wilcox, USA

Product features

Flexible variants: field-erected or plug-and-play
Available as field-erected or plug-and-play variants to match site transport limitations and installation needs
Multi-fuel compatibility
Supports a wide range of fuels for operational flexibility
Shop-assembled membrane panels
Shop-assembled, machine-welded membrane panels allow for less refractory and make a gas-tight enclosure resulting in less leakage and improved efficiency
Two-stage steam separation
Utilises two-stage steam separating equipment within the drum, guaranteeing 99.99% steam purity, even during rapid load changes, to ensure turbine-quality steam
Excellent efficiency
89% on NCV
Optimum combustion with staged secondary air system
Secondary overfire air provided from both sides of the furnace ensures complete combustion, resulting in minimum unburnt particles, reduced carbon monoxide and improved efficiency
Bed evaporator design for better reliability and temperature control
Features inline, spaced evaporator tubes for easy access to the bed plate, simplifying maintenance and improving efficiency, along with a riffle tube arrangement for higher-pressure applications to enhance durability
Fluid bed ash coolers for cooling bed ash
Ensures efficient cooling of bed ash using air; the resulting heated air (flue gas) is then sent to an air heater, recovering sensible heat and significantly improving overall system efficiency
Overbed as well as underbed feed system offered
The underbed system uses drag chains and/or rotary feeders for smooth delivery of high-moisture fuel, with hot air transporting the fuel within the combustor and straight fuel lines without bends, enhancing system availability
Inclined airholes
Inclined airholes are designed to prevent bed material re-entry, effectively eliminating back shifting within the system
Stainless steel air nozzles
Stainless steel (bubble cap) nozzles for primary air are engineered with a higher pressure drop, enabling higher turndown ratios and thus providing greater operational flexibility
Pin studs for erosion control
Pin studs welded on in-bed surfaces and furnace walls effectively eliminate tube erosion
89% on NCV Up to 560°C Up to 140 kg/cm²(g)
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
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)
Up to 300 TPH
Dumping Grate Boilers

Dumping Grate Boilers

Offering a robust, reliable solution for efficiently burning diverse solid fuels

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Dumping grate boilers feature stationary grate design with intermittent ash discharge for simplified operation and reduced maintenance.

The stationary grate minimises continuous wear and tear. Ash is discharged intermittently, providing controlled removal of accumulated ash and clinker directly into the ash pit. Simple construction reduces maintenance needs, while periodic ash removal prevents clinker buildup and enhances furnace cleanliness.

Technical data

  • Product capacity / performance range –

    • Capacity range: Up to 300 TPH

    • Pressure: Up to 160 kg/cm²(g)

    • Temperature: Up to 560°C

  • Fuel type or energy sources – Bagasse

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

  • Design – 

  • Dumping grate combustion technology

    • Vertical & horizontal models

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

  • Other technical information –
    Can be offered as:

    • Boiler island

    • Boiler-turbine-generator (BTG) package

    • Turnkey power plant (EPC)

Product features

Intermittent ash removal (dumping action)
The intermittent dumping action periodically releases accumulated ash and clinker directly into an ash pit below
Stationary or semi-stationary operation
Dumping grates remain largely stationary during combustion
Simple construction & maintenance
Fewer moving parts result in easier maintenance and lower capital cost
Optimised combustion in tall furnace
Significantly increases flue gas residence time, ensuring complete fuel combustion before gases enter the superheater
Complete volatile combustion with over-fire air
An over-fire air system provides essential turbulence and thorough mixing of volatile gases, ensuring complete combustion
90% on NCV Up to 560°C Up to 160 kg/cm²(g)
Up to 300 TPH
Reciprocating Grate Boilers

Reciprocating Grate Boilers

High-efficiency, low-maintenance solution with fuel flexibility for demanding agro, industrial, and waste applications

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TBWES' reciprocating grate boilers are ideal for combustion of fuels having high moisture, low calorific value, and irregular or oversized particles

The reciprocating grate (pusher grate) combustion technology ensure efficient and complete combustion through continuous fuel agitation. The tumbling action enhances mixing, improves burnout, and accommodates variable fuel sizes and moisture content. Featuring flexible designs, multi-fuel firing capability, optimised furnace design, modular grate construction and precision airflow control, our boilers are highly suitable for high-moisture agricultural waste, non-recyclable solid waste and other industrial process waste

Technical data

  • Product capacity / performance range –

    • Capacity range: Up to 300 TPH

    • Pressure: Up to 160 kg/cm²(g)

    • Temperature: Up to 560°C

  • Fuel type or energy sources – 
    Bagasse, biogas, biomass, cane leaves, coco husk, coconut chells, coffee grounds, corn cob, cotton stalk, de-oiled rice bran (DORB), empty fruit bunch (EFB), ground nut shell, julia flora oil, king grass, maize stalk, mustard husk, napier grass, palm fibre, palm kernel shell, palm waste, paper sludge, pith, red gram stems, rice husk, rice straws, roasted shaffs, saw dust, Straw, tapioca stem, wood chips, wood bark, spent wash (vinasse), etc.

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

  • Design -

  • Single-drum and bi-drum configurations

        - Site-assembled or partially modularised

        - Reciprocating grate combustion technology

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

  • Other technical information –
    Can be offered as:

    • Boiler island

    • Boiler-turbine-generator (BTG) package

    • Turnkey power plant (EPC)

Product features

Multi-fuel compatibility
Supports a wide range of fuels for operational flexibility
Low-calorie, high-fouling, high-moisture & irregular waste compatibility
The furnace and convection zone are specifically designed to handle challenging fuels effectively
Reduced suspension burning
Mass burn technology minimises suspension burning and carry-over, ensuring more complete combustion
Flexible grate widths with scalable modular design
Modular grate construction enables larger section widths from 1.5 m to 3 m, with multiple sections assembled laterally to achieve greater overall widths
Versatile grate cooling options
Both air-cooled and water-cooled grate designs are available, tailored to specific fuel characteristics for optimal cooling
Optimised grate bar performance
Fully machined grate bars ensure proper clearances for thermal expansion, movement, and efficient airflow
Precision airflow control
Air plenum of each grate section is divided into multiple sections along the length, enabling independent control of airflow to each section as per combustion requirement
Variable grate speed control
Each grate section can be controlled individually with the help of VFD to ensure proper combustion of different variety of fuels ensuring complete fuel flexibility
Proven ram feeder design for handling bulky fuels
Hydraulically operated, water-cooled ram feeder ensures continuous waste input, even for bulky fuels, supported by a hydraulic ash extractor system, ensuring proper air sealing, thereby eliminating backfire
Corrosion & wear resistance
Special alloy castings provide superior resistance to corrosion and extend wear life
90% on NCV Up to 560°C Up to 160 kg/cm²(g)
Up to 300 TPH
Pinhole Grate Boilers

Pinhole Grate Boilers

Advanced pinhole grate boilers ensure efficient, reliable combustion for diverse industrial and agro-waste applications

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TBWES pinhole grate boilers feature water-cooled stationary grate, efficient ash removal, and optimised combustion for various challenging fuels.

Engineered for demanding industrial applications, our boilers minimise emissions, maximise energy recovery, and ensure stable, long-term operation. Precision over-fire air injection and optimised grate configurations provide exceptional combustion efficiency. Strategically placed steam nozzles enable online ash removal without pressure drops. This robust design also allows for hot air intake up to 250°C, ensuring smooth combustion, even for high-moisture bagasse and low-ash fuels.

Technical data

  • Product capacity / performance range –

    • Capacity range: Up to 300 TPH

    • Pressure: Up to 160 kg/cm²(g)

    • Temperature: Up to 560°C

  • Fuel type or energy sources – Bagasse, biogas, biomass, cane leaves, coco husk, coconut shells, coffee grounds, corn cob, cotton Stalk, De-oiled rice bran (DORB), empty fruit bunch (EFB), ground nut shell, julia flora oil, king grass, maize stalk, mustard husk, napier grass, palm fibre, palm kernel shell, palm waste, paper sludge, pith, red gram Stems, rice husk, rice straws, roasted chaffs, saw dust, straw, tapioca stem, wood chips, wood bark, spent wash (vinasse), etc.

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

  • Design – 

    • Single-drum and bi-drum configurations

    • Site-assembled or partially modularised

    • Pinhole grate combustion technology

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

  • Other technical information – 
    Can be offered as:

    • Boiler island

    • Boiler-turbine-generator (BTG) package

    • Turnkey power plant (EPC)

Product features

Static, water-cooled grate design
A stationary, inclined water-cooled grate design eliminates moving parts in the furnace, preventing mechanical failures and reducing maintenance
Efficient on-line ash removal & combustion enhancement
Steam nozzles enable simplified on-line ash removal without boiler pressure drops, simultaneously agitating fuel to reduce unburnt carbon loss
Economical for high-capacity boilers
This offers an economical and viable solution, particularly well-suited for high-capacity boiler applications
High-temperature air combustion capability
Efficiently handles preheated air up to 250°C, ensuring smooth and effective fuel combustion
High-moisture bagasse combustion
Inherently designed for and highly capable of efficiently burning high-moisture bagasse
Complete volatile combustion with overfire air
An overfire air system provides essential turbulence and thorough mixing of volatile gases, assuring complete combustion
Uniform fuel distribution
An adequate number of feeders ensures consistent and uniform distribution of fuel across the grate
Optimised for low-ash fuels
Particularly suitable for biomass fuels
90% on NCV Up to 560°C Up to 160 kg/cm²(g)
Up to 300 TPH
Travelling Grate Boilers

Travelling Grate Boilers

Known for precise control, robust design, fuel flexibility, low maintenance, high efficiency and continuous, reliable performance

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Travelling grate minimises excess air infiltration, enhancing combustion efficiency and fuel economy, while ensuring long-lasting, maintenance-free sealing through self-adjusting, rugged air seals.

Our travelling grate boilers feature a tall furnace for complete combustion and multi-level secondary air jets for enhanced mixing. The hydraulic / planetary gear drive with VFD offers precise speed control and high efficiency, even under heavy loads. A catenary and overlapping grate design prevents material leakage and air infiltration, while a continuous ash discharge system and over-fire air ensure complete, trouble-free operation.

Technical data

  • Product capacity / performance range –

    • Capacity range: Up to 300 TPH

    • Pressure: Up to 160 kg/cm²(g)

    • Temperature: Up to 560°C

  • Fuel type or energy sources – Bagasse, biogas, biomass, cane leaves, coal, coco husk, coconut shells, coffee grounds, corn cob, cotton stalk, de-oiled rice bran (DORB), ground nut shell, julia flora oil, king grass, maize stalk, mustard husk, napier grass, palm fibre, paper sludge, petcoke, pith, red gram stems, rice husk, rice straws, roasted chaffs, saw dust, straw, tapioca stem, wood chips, wood bark, paper sludge, etc.

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

  • Design – 

    • Single-drum and bi-drum configurations

    • Site-assembled or partially modularised

    • Travelling grate technology ensures uninterrupted combustion

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

  • Additional technical information – 
    Can be offered as:

    • Boiler island

    • Boiler-turbine-generator (BTG) package

    • Turnkey power plant (EPC)

Product features

Optimised combustion in tall furnace
Significantly increases flue gas residence time, ensuring complete fuel combustion before gases enter the superheater
Catenary & overlapping grate design for efficiency
Catenary curvature keeps grates closed without the aid of auxiliary weights, preventing material leakage into the drive, while an overlapping design minimises air leakage
Hydraulic/planetary grate drive with VFD benefits
Planetary gear drive with variable frequency drive (VFD) enables higher transmission efficiency and fine speed control (10:1 turndown) for heavy-duty loads
Precise grate speed control
Achieves highly precise grate speed variation, continuously adjustable within a range of 
0-12 m / hr (0-45 ft /hr)
Multi-stage superheater with attemperation
Features a two or three-stage superheater with an inter-stage feedwater spray attemperator for precise steam temperature control
Multi-level secondary air injection
High-pressure, deep-penetration secondary air jets, strategically placed at multiple furnace levels, promote turbulence and thorough mixing for complete combustion of volatiles
Complete volatile combustion with over-fire air
Provides essential turbulence and thorough mixing of volatile gases, ensuring complete combustion
Automated continuous ash discharge
Reduces operator dependence and ensures consistent and efficient ash removal during operation
Online grate maintenance
Grate maintenance can be performed without requiring a boiler shutdown, ensuring continuous operation
90% on NCV Up to 560°C Up to 160 kg/cm²(g)
Subscribe to Up to 560°C

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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