Heat Recovery Steam Generators built by COMEF

Heat recovery steam generators (HRSG)

  • Exausted gas turbine fueled
  • With or without post firing or fresh air systems

Comef is able to offer to Client pressure parts, superheated banks, economizer, evaporator banks and modules, drums, heat exchangers of any type


Electricity from 2 GT Water-tube boiler, Gas Duct, Duct Burner

Fuel 2 GT exausted gases - 2,6 t/h nat. gas
Boiler data 65 t/h, 87 bar, 500°C (SH)
Furnace Thermal Power 34 MWth Duct Burner
Electric power 2 x 7,5 MWe GT + 10 MWe Steam Turbine
Thermal Output Process 30 MWth for industrial process (paper mill)


Cogeneration from 2 GT Water tube boilers, thermal cycle, steam turboset, District Heating exchangers
Fuel GT exausted gases - 3,5 t/h nat. gas
Boiler data 15,3 t/h each (2 lines), 47 bar, 435 ° C (SH)
Furnace Thermal Power 24,5 MWth each line
Electric power 7,3 MWe each TG line, 2 MWe steam turboset
Thermal output to process 3 MWth each line to district heating

Heat Recovery Steam Generators 
built by John Cockerill Energy

  • Combined cycle and cogeneration power plants
  • Gas turbines from 30 MW ISO up to 400 MW
  • Any turbine brand: GE, MHPS, Ansaldo, Siemens, Alstom, and others
  • Turbines fired with gas or heavy fuel oils
  • Base load and heavy cycling operation modes
  • Repowering and greenfield projects

Tailor-made HRSGs to meet customers' specific requests:

  • Supplementary firing with upfront and interstage burners
  • Deaerator feedwater tank and feedwater systems
  • Selective Catalytic Reduction (SCR) and CO catalysts
  • Boiler enclosure housing
  • Auxiliary systems such as dosing, sampling, nitrogen systems, etc.
  • Sootblowers if needed
  • Fresh air firing for special applications

In the field of steam generation and HRSG, John Cockerill provides technological audits and expertise, maintenance and revamping or repair of boilers of all brands.

Project Flexibility & Expertise

Combined cycle and cogeneration plants/ Behind gas turbines from 256 MW to 500+ MW ISO and all brands of gas turbines: Alstom, Ansaldo, GE, MHPS, Siemens/ Base load and heavy cycling modes os operation/ Repowering, greenfield and brownfield projects.

John Cockerill Energy-vh-designs
John Cockerill Emile-huchet-france

Emile Huchet, France

Vertical or Horizontal HRSGs/ Natural or assisted circulation/ Single, dual, triple pressures with or without reheat/ Natural gas; light, heavvy and crude oil/ once-though steam generators/ Certified to ASME, PED, GOST-R, ISO 9001, ISO 14001.

John Cockerill Dunamenti-hungary

Dunanebti, Hungary

Suplemental firing with up-front or interstage bunners/ Deaerator feedwater tanks and subsystems/ Selective Catalytic Reduction (SCR) and CO catalysts/ Boiler housings/ Auxiliaries (dosing, sampling and nitrogen systems)/ Sootblowers/ Fresh-air firing for special applications.

John Cockerill Turnkey-hrsg-solutions
John Cockerill Easy-construtction-durable-performance

Heat Recovery Steam Generators built by Thermax Boilers & Heaters Group

Heat Recovery Steam Generators built by Thermax Boilers & Heaters Group

Heat Recovery Steam Generators are used to recover waste heat from exhaust of gas turbines, boosting efficiency from 35% to 40 % range in simple cycle (also known as open cycle) mode to 55% to 60% range in combined cycle mode. The steam generated by HRSG can be used for process heating or generating electricity in a steam turbine. Such units are installed on gas turbines ranging from below 1MW up to 320MW.

These units are offered with features such as horizontal/vertical design, Natural/Forced circulation, triple pressure levels with reheat option, supplementary and fresh air firing mode with automatic changeover, bidrum/single drum.

Thermax HRSGs* incorporate the latest advances in thermal technology, offering benefits such as multiple pressure levels and unprecedented reliability. The growing number of Thermax HRSGs bears testimony to their importance in ‘clean energy' solutions.

Product Features

  • Single drum construction for reduced thermal stress during start-up & shutdown; special drum internals that promote circulation &  ensure high steam purity
  • Fully welded construction for quicker start-ups & shutdowns with welds safely located outside the gas path for higher reliability and longer life
  • Gas-tight, internally insulated ducting & casing for lower thermal loads; internal duct designed carefully for predictable performance & longer life
  • Tolerant to economiser steaming for better off-design operation; fully drainable super heater for higher reliability
  • Strategic soot blowing for oil firing
  • Firing gas, #2 and #6 oil in the duct burner

Boiler-Turbine-Generator (BTG) packages can be offered on a case-to-case basis.

Operating Range

  • Capacities: Gas Turbine size of 320 MW
  • Pressure: Up to 175 kg/cm2 (g)
  • Temperature: Up to 603ºC
  • Fuels: Natural gas/naphtha/HSD/kerosene/refinery gas, heavy high sulphur fuel etc.

Level of Prefabrication

Heat Recovery Steam Generators can have a very large size depending on the design of the unit and is there by offered as a fully modularized unit or a combination of modular and site assembled units.

  • Modularized - Modules prefabricated and hydrotested in workshop, made by pressure parts section and casing internally insulated to be transported to site.
  • Site Assembled - Workshop prefabricated harps to be modularized at the job site.
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