Gas turbine size up to 320 MW
Heat Recovery Steam Generators (HRSG)

Heat Recovery Steam Generators (HRSG)

High-efficiency HRSG engineered for flexible operation, compact footprint, and optimised heat recovery from turbine exhaust

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TBWES offers customisable HRSG with natural circulation and modular construction.

It is designed to recover waste heat from gas turbine exhaust for process heating or power generation.
Our HRSGs feature natural circulation for low power use, gas-tight cold casing for thermal efficiency, and fully welded, single or bi-drum construction. Modular designs, ranging from simple modules to plug-and-play units, enable easy installation. Options include unfired, supplementary-fired, and fresh air-fired modes, with advanced steam purity control and optimised inlet ducting to ensure peak performance under dynamic load conditions.

Technical data

  • Product capacity / performance range –
    • Gas turbine size up to 320 MW
    • Pressure: Up to 160 kg/cm²(g)
    • Temperature: Up to 566°C
  • Fuel type or energy sources – 
    Primary energy source: Hot exhaust gases from gas turbines
    Supplementary fuels: #2 oil, natural gas / naphtha / HSD / kerosene / refinery fuel gas / LPG etc.
  • Compliance or standards followed – ASME / ATEX / PED with CE marking / TRCU / EN / BS / DIN / IBR
  • Design –
    • Fully modularised (plug-&-play modules) / partially modularised / field-erected
    • Single-drum and bi-drum modular configuration
    • Horizontal / vertical design
    • Natural / forced circulation
    • Triple pressure levels with two-stage firing with reheat option
    • Firing mode: Unfired, supplementary and fresh air with automatic changeover
  • 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 a case-by-case basis

Product features

Various modularisation philosophies
Options include Simple Pressure Part Module, “O” Section Modules and Full Modularisation. Our Plug-&-Play Modules simplify transport, reduce site work, and speed up installation
Flexible design options
HRSGs are offered in unfired, supplementary-fired, and fresh air-fired modes. Multiple pressure levels with reheat and integral deaerators are tailored to user needs
Natural circulation design
Eliminates the need for external pumps, reducing power consumption and common pump-related issues. This ensures high reliability and availability of the HRSG
Fully welded construction
All pressure parts are welded to headers, enabling faster start-ups and shutdowns. This supports seamless tracking of gas turbine operation
Single-drum configuration
Steam drum is placed outside the gas path to reduce thermal stress. Allows for rapid starts and stops in sync with gas turbine load changes
Bi-drum configuration
Ideal for turbines below 15 MW; features expanded tubes in steam and water drums. Skid-mounted options are also available for easy installation
Special drum internals
Custom internals ensure high steam purity (99.99% dryness) by promoting proper circulation. Supports stable performance during rapid load changes
Optimised inlet duct design
Carefully engineered ducts manage turbulent turbine exhaust for uniform flow. Prevents superheater overheating and ensures rated HRSG performance
Gas-tight internally insulated casing
Features a fully enclosed gas-tight insulated casing with stiffeners, resulting in minimised thermal expansion of the casing due to continuously varying GT loads and reduced thermal loads on the gas turbine flange
Fully drainable superheater HARPs for high reliability
A fully drainable superheater harp improves HRSG reliability by preventing water accumulation, reducing thermal shock and corrosion during startups, and enabling safer, faster operation—especially in cycling plants
Up to 566°C Up to 160 kg/cm²(g)
10 TPH to 100 TPH
Non-ferrous Industry

WHRB in Non-Ferrous Industry

Designed to utilise smelter, roaster and converter gases to recover valuable waste heat energy

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At TBWES, we provide customised waste heat recovery boilers (WHRBs) for zinc pyrite roasters, copper smelters, and copper converters.

In these applications, our boilers typically operate at high pressure without superheating, allowing safe operation above the gas dew point and minimising corrosion risks.Non-ferrous metal plants generate significant waste heat during metal processing. Our WHRBs efficiently capture this thermal energy from smelters, converters, or roasters to generate steam or electricity. These systems enhance energy recovery, reduce environmental impact, and lower operating costs, making them an essential component of modern, energy-efficient metallurgical operations.

Technical data

  • Product capacity / performance range - 

    • Capacity: 10 TPH to 100 TPH

    • Pressure: Up to 160 kg/cm2(g)

    • Temperature: Up to 540°C

  • Energy sources - Heat source: Flue gases from roasters, smelters, converters, etc.

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

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

Product features

Forced circulation water-tube design
Delivers high heat transfer efficiency under demanding conditions
Gas-tight side wall with water wall design
Ensures containment and thermal protection
Wide-pitched in-line tube geometry
Minimises choking and allows smooth gas flow
On-line hammering system
Enables continuous cleaning without shutdown
Gas flow baffles
Prevents channelling and ensures uniform heat distribution
Cavity with variable pitch convection coils
Enhances heat recovery and reduces fouling
Up to 540°C Up to 160 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 160 kg/cm²(g)

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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