Boilers and Power Plants for solid fuels built by COMEF

Active presence on the market for more than forty years represents unquestionable credential for Comef. 
Engineering, construction, erection, plant’s start up, Client’s personnel training, service and maintenance; in a single word “turnkey plant”. 

Electric energy and/or thermal energy production plants by renewable sources (biomass and assimilated refuses) and by fossil fuels; co-generation plants; heat district plants. 

On its own design, Comef is able to match any Client plant needs: fuel storage; fuel to furnace conveyor; combustion furnace large proposal (mobile grates (air or water cooled), fix grates, fluidized beds); fired steam generators; furnace integrated or behind adiabatic room; flue gas cleaning according strongest applicable requirements; ash systems; thermal cycle ( steam turbine, condenser, deaerator); electric and/or thermal energy generation and distribution; auxiliary systems; supervision and control system.


Huge is generator range Comef is able to offer based on fuel ( biomass, refuses, fossil fuels, various refuse derived fuels ) and plant Client’s needs. 

Vertical path boilers, horizontal path boilers, watertube boilers, firetube boilers, thermal oil boilers. 
Boilers integrated on furnace or behind adiabatic room, for hot water, superheated water, saturated steam, superheated steam. 
For electric and/or thermal energy production. 
Reliable and innovative components dress our boilers; ash systems, efficient and highly automated cleaning systems, equipments for speed maintenance.


  • methane, oil derived, coke powder, biomass fueled
  • Steam generation for electric and/or thermal production, included heat district
  • Heat generation through thermal oil
  • Forced or natural circulation
  • Biomass, municipal waste, refuse derived fuel fired.
  • Steam generation for electric and/or thermal production, included heat district
  • Combustion on grate or fluidized bed

Electricity from biomass Fluidized bed furnace, integrated water tube boiler, steam turboset, condensing system, thermal cycle, electrical-instrumentation system, DCS 
Fuel Wood chips - 6,1 t/h - 53.000 t/yr 
Boiler data 18,6 t/h, 80 bar, 520°C (SH) 
Furnace Thermal Power 15,6 MWth 
Electric power 5 MWe


Electricity from biomass Grate furnace, integrated water tube boiler, flue gas treatment system, condensation system, thermal cycle 
Fuel Rice husk mixed to wood chips - 15 t/h – 130.000 t/yr 
Boiler data 40,5 t/h, 62 bar, 450°C (SH) 
Furnace Thermal Power 37 MWth 
Electric power 6,4 MWe

CFB Boilers and Power Plants for solid fuels built by Doosan Lentjes

Doosan Lentjes’ Circulating Fluidised Bed (CFB)
Boiler Technology

  • Experienced technology since 1982
  • Proven technology combining environmentally-sound
  • combustion with superior fuel flexibility
  • High operating flexibility with respect to
    • Fuel quality
    • Load range
  • Efficient and economic integrated desulphurisation
  • and NOx control
  • Flexibility in operation range
  • Compact plant layout



  • To more than 110 CFB boilers worldwide
  • For a broad variety of fuels – even the most demanding
  • For capacities up to 330 MWe
  • Ready for design of up to 600 MWe

CFB Boilers

  • CFB combustion solutions for a broad range of fuels:
    • from very low calorific lignite coal to bituminous coal
    • from pet coke to anthracite
    • from discard coal to biomass
  • Turn key solutions for the Boiler Island up to the stack
  • More than 100 boiler lines in operation based on Doosan
  • Lentjes’ technology
  • CFB Boiler from 100 MWe up to 350 MWe based on
    • 2 to 4 cyclone design ( depending on fuel and ambient conditions)
    • for middle and high cal fuel on the basis of the RPM module
    • for low cal fuel on the adiabatic combustion chamber concept

See more info about Doosan Lentjes CFB here.

Boilers and Power Plants for solid fuels built by Thermax Boilers & Heaters Group

Atmospheric Fluidized Bed Combustion Boiler (AFBC)

Atmospheric Fluidized Bed Combustion Boiler (AFBC)

1 unit of 25 TPH, 45 kg/cm2(g), 480° C coal fired boiler

Product Features

  • Multifuel firing
  • Optimum combustion with staged secondary air system
  • Machine welded membrane panel
  • Better steam purity
  • Bed evaporator design for higher reliability
  • Pin studs welded on inbed surfaces
  • Overbed as well as underbed feed system offered

Operating Range

  • Capacity: Up to 300 TPH
  • Pressure: Up to 160 kg/cm2(g)
  • Temperature: Up to 540°C
  • Fuels: Coal, lignite, rice husk, petcoke, spent coffee ground, washery rejects, low ash coal, paper sludge, roasted chaffs, DOB, bagasse, pith woodchips, biomass etc.

Circulating Fluidised Bed Combustion Boiler (CFBC)

Circulating Fluidised Bed Combustion Boiler (CFBC)

5 units of 500 TPH, 125 kg/cm2(g), 535°C Indonesian coal, Indian coal, petcoke fired boilers

Product Features

  • Multifuel firing capability
  • Compact, economical design and construction
  • Impact separation with ‘U-beam’ particle separators
  • Best-in-class compliance with environmental norms
  • Low auxiliary consumption
  • Minimum refractory
  • No sootblowers required
  • Air cooled bottom-ash cooler
  • High turndown
  • No interface erosion at panel to refractory interface

Operating Range

  • Capacity: Up to 1000 TPH
  • Pressure: Up to 200 kg/cm2(g)
  • Temperature: Up to 560ºC
  • Fuels: High ash/ low ash, petroleum coke, sludge, oil pitches, biomass, highsulphur coal, petcoke, washery rejects, mill rejects, agro waste, refuse derived fuel, char, fly ash etc.

Bagasse & Biomass Fired Boiler

Bagasse & Biomass Fired Boiler

1 unit of 140 TPH, 82 kg/cm2(g), 520°C bagasse, coal, king grass fired travelling grate boiler

Product Features

  • Continues ash discharge
  • Grate driven by hydraulic / planetary gear with VFD
  • Caternary design
  • Fine control on grate speed variation
  • Overlapping grate design prevents air leakages
  • Overfire air system provides turbulence and thorough mixing of volatile gases, thus assuring complete combustion
  • Online maintenance of grate
  • Three / two stage superheater with inter stage feed water spray attemperator
  • Tall furnace for complete combustion
  • Pinhote grate or pusher grate is offered for specific applications

Operating Range

  • Capacity: Up to 300 TPH
  • Pressure: Up to 150 kg/cm2(g)
  • Temperature: Up to 550ºC
  • Fuels: Biomass, bagasse, wood chips, coconut shell, saw dust, rice husk, corn cob, cane leaves, king grass, napier grass, paper sludge, coal, roasted chaffs, DOB, palm waste, red gram stems, ground nut shell, rice straws, tapioca stem, mustard husk, cotton stalk, julia flora, coco husk, maize stalk, EFB, palm kernel shell, palm fibre etc

Bi-Drum Packaged / Site Erected Boiler

Bi-Drum Packaged / Site Erected Boiler

1 unit of 273 TPH, 65 kg/cm2(g), 500° C Arabian light crude oil & natural gas fired PFM boiler

Product Features

  • Package boiler completely pre-engineered with packaged design
  • Special design of drum internals for high steam purity
  • Membrane / studded wall water-cooled furnace construction
  • Fully drainable convective superheater
  • Fine combustion control and high turndown ratios

Operating Range

  • Capacity: Up to 500 TPH
  • Pressure: Up to 110 kg/cm2(g)
  • Temperature: Up to 538°C
  • Fuels: All liquid and gaseous fuels, waste fuels, tar, hydrogen, refinery gases etc.

Single-Drum High Capacity Boiler

Single-Drum High Capacity Boiler

1 unit of 175 TPH, 115 kg/cm2(g), 510°C natural gas, diesel fired boiler

Product Features

  • Fully drainable, horizontal and convective superheater for longer life and high reliability
  • Front wall firing for a variety of liquid and gaseous fuels (independently or in combination)
  • Steam drum outside the flue gas path permits quick startup and load
  • Large furnace size and volume ramp up
  • Leak proof membrane wall design
  • Steam cooled superheater supports for increased reliability
  • Low refractory and thus reduced maintenance

Operating Range

  • Capacity: Up to 500 TPH
  • Pressure: Up to 160 kg/cm2(g)
  • Temperature: Up to 560ºC
  • Fuels: Liquid fuels such as natural gas, purge gas, coke oven gas, #2 oil, #6 oil, heavy fuel oil, residue oil, HSD, naphtha, hydrogen gas, bio gas, waste gas etc.

Industrial Boilers built by John Cockerill

Calling on more than 200 years of expertise, John Cockerill Energy designs, manufactures and maintains steam producing industrial boilers under the brand names of Denapak and Denarad. We provide technological solutions to our clients in various sectors: chemicals, petrochemicals, the foodstuffs industry, biomass etc.

Responding to the needs of industry
To assist our clients with their industrial projects, our teams create and manufacture boilers suited to their needs. Calling on know-how built up over the years, they perfect creative and constantly optimized solutions:

  • John Cockerill Energy steam producing industrial boilers are designed to function at high pressure.
  • Their membrane-wall construction guarantees pressurized combustion, avoiding gas leakages and reducing problems of corrosion and maintenance costs.
  • The use of in-line tubes for the principal beam of the boiler leads to optimal use of the exchanger surface and enables effective cleaning using soot blowers.
  • Super-heating is protected against direct radiation from the flame, thanks to an entry beam which maintains the low temperature of the super-heating tubes and reduces high temperature corrosion.
  • The condensate pre-heater avoids dew point corrosion.
  • Large dimension vats and reduced speed steam guarantee the production of high purity steam.
  • The rigid chassis and the handling lugs simplify the foundations and enable rapid installation.

Steam generation, our shared expertise
Along with the manufacture and maintenance of industrial boilers, John Cockerill Energy has extensive expertise in the domain of steam production. This allows us to design, manufacture and maintain recuperation boilers and thermo-solar receivers, and also to assist our clients in the modernization of their existing installations and provide them with maintenance on site or in the workshop.

Industrial boilers
Boilers for thermo-solar power plants

Boilers for thermo-solar power plants

Steam generation is the keystone of the history of John Cockerill Energy. Today, thanks to producing energy 24 hours a day using molten salts technology, our boilers for thermo-solar power plants (Solar CPS energy) provide an alternative to the use of fossil energies. They illustrate our desire to always go the extra step in offering innovative solutions which facilitate access to energy. And respond to the needs of our times.

An alternative to fossil energies
The boilers for thermo-solar power plants (Solar CPS energy) designed by our teams capture the energy of the sun’s rays reflected by thousands of mirrors located on the ground. Located at the top of a tower at the heart of an electricity plant, the receiver absorbs this solar energy and converts it into thermal energy. This innovative technology enables all types of coolant fluids to be re-heated along with the direct generation of steam. Capable of storing large quantities of energy and of producing electricity even at night, it is currently the best performing alternative to the use of fossil fuels.

Salt, the energy of the future
To store solar energy in large quantities and ensure it is available 24 hours a day, our boilers for thermo-solar power plants use the new molten salts technology. Molten salts constitute an inexpensive coolant fluid resistant to fire and non-polluting. They provide a first rate solution for producing electricity day and night. In collaboration with its clients, John Cockerill Energy designs thermo-solar boilers for the most exposed areas on the planet. Our teams have developed and supplied a thermo-solar receiver for the Khi Solar One electric power plant(50 mWe), in service in South Africa.  They have also created a molten salts thermo-solar receiver destined to be installed in the Atacama 1 power plant (110 mWe), in the course of construction in Chile. This enables a power of 760 mWth to be absorbed and energy to be stored for seventeen and a half hours.

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