Projects

Every year, numerous companies place their trust in the Callens Group. We deliver installations tailored to your needs and future ambitions, from brand-new systems to complex renovation projects. With temporary rental boilers, we keep your production running throughout the works. And once your installation is up and running, you can continue to rely on our service to keep it performing at its best.

Hybride Stoomketels Tiense Suiker 2
Heat technology Steam boilers Hybrid +2

Zero by 2050 is coming closer with hybrid steam boilers

Capacity2 x 15 T/h
Design pressure13 barg
Eboiler 4
Heat technology Electrode boilers Steam boilers +2

E-boilers combine increased production with lower CO₂ emissions

Capacity2 x 5 MW 
Connection voltage15 kV
“Every technological breakthrough sets something in motion. While innovation used to almost automatically involve major investments, today we see technologies that are mature, scalable and economically viable. At every stage of the heating and air process, we can make a difference.”
Decospan Menen VKK 4 T 15 MW PRJ240302 4
Heat technology Steam boilers Hybrid +2

Hybrid power for a volatile energy market

Capacity6.3 T/h (4 T/h + 1.5 MW electric)
Design pressure13 barg
Callens Warmtepomp 3
Heat technology Industrial heat pumps Electrification +1

Industrial heat pumps reduce CO₂ emissions

Capacity4.2 MW
Energy source100% electricity
Soudal Turnhout afzuiging drijfgassen PRJ12563 13
Air technology Extraction Gas and vapor extraction

Extraction system takes on hazardous propellants

Capacity40,000 m3/h
Zone typeAtex
PRJ250188 Poppies Zonnebeke Warmtetechniek 2
Heat technology CO2 reduction Energy recovery for thermal technology

Waste heat from baking ovens keeps buffer tank temperature stable

Capacity per condenser43 kW
Exhaust airflow1,200 m³/h
Lamb Weston 900kgh 22 barg Bergen op Zoom PRJ220144 1
Heat technology Steam boilers Electrification +2

100% electric steam boiler brings new potato flavors to temperature

Capacity900 kg/h
Operating pressure22 barg
Working pressure16-18 barg
Callens stoom 1
Heat technology Hydrogen-fired CO2 reduction +1

Steam boiler feels the heat of hydrogen

Capacity25 T/h
Design pressure25 barg
Volvo Car Gent penthouse 2x36000 m2 PRJ230077 1
Air technology Climate control Industrial ventilation +1

Double ventilation system for safe battery assembly

Supply and exhaust2 x 36.000 m3 per unit
Power730 kW per unit
Agfa Gevaert Mortsel Eboiler weerstand 5 MW Danstoker PRJ230202 1
Heat technology Electrification Electric +2

Electric steam boiler efficiently harnesses surplus electricity

Capacity8 T/h
Power5 MW
Design pressure10 barg
Brouwerij De Brabandere Bavikhove ST biogas 25 T PRJ12427 1
Heat technology Valorizing waste flows Biogas-fired +2

Steam boiler utilizes brewery’s biogas maximally

Capacity2.5 tons/h
Operating pressure13 barg
Working pressure8 barg
Callens luchtontvochtiging kartonproducent 1
Air technology Drying Process air +2

Dehumidification with additional air conditioning and heat recovery

Extraction flow 4 x 28,000 m3
Supply air flow 4 x 28,000 m3
Heating capacity4 x 224 kW
Katoen Natie Antwerpen ST 25 T Containerverwarming PRJ12707 4
Heat technology Steam boilers Gas-fired

Steam and central heating system keep bulk containers reliably warm

Capacity2,5 T/h
Operating pressure13 barg
20230426 153901
Heat technology Steam boilers Gas-fired +2

From expensive overcapacity to balance with backup steam

Capacity2 x 5T
Seal pressure10 barg
Operating pressure6 barg
<Digimax S500 / Kenox S500 / Digimax Cyber 530>
Heat technology Hot water & industrial central heating boilers Gas-fired

Condensing central heating boilers keep transport tanks nice and clean

Output2 x 2,000 kW
Fuelnatural gas
Combustion efficiency106 %
Callens cvketel wisselende warmtevraag
Heat technology Hot water & industrial central heating boilers Gas-fired

Central heating boiler rides the waves of a wood drying plant’s fluctuating heat demands

Output4,200 kW
Combustion efficiency95%
Tereos Syral Aalst ST 3x30 T PRJ7761
Heat technology Steam boilers Gas-fired +1

Combined heat and power system getting backup from 90 tons of steam an hour

Output3 x 30 tons of steam/h
Operating pressure18 barg
Efficiency96%
20210824 102740
Heat technology Steam boilers Gas-fired

Steaming research for better and more sustainable vegetable and potato products

Capacity1.000 kg/h
Operating pressure21 barg
Callens stoom vlampijp Colac 1
Steam boilers Gas-fired Backup +1

Heat from fire-tube boiler to industrial cooking pots

Capacity2 x 3 200 kg/h
Operating pressure13 barg
IMG 2718
Heat technology Thermal oil boilers Gas-fired

Solution to highly diverse heating needs

Output2 x 5,200 kW
Operating regime250 - 290 °C
Callens tankverwarming transport 1
Heat technology Steam boilers Gas-fired +2

Ambitious transport company constructs extra lanes for tank heating with steam and central heating boilers

Capacity4 ton / h
Operating pressure10 barg
Konings Drinks Bredea ST Piping 14 T PRJ12518 1
Heat technology Steam boilers

Extra piping allows launch of new production line for canned fruit juices

Capacity14 t/h
Operating pressure12 barg
Working pressure8 barg
Callens warmterecuperatie 1
Heat technology Energy recovery for thermal technology

Heat recovery gives lost energy a new lease of life

Output1,500 kW
Output1,100 kW (backup )
20200312 105518 bewerkt
Heat technology Dual fuel Steam boilers

Steam plant with 'dual fuel' burner balances heat supply

Capacity7t/h
Working pressure10 barg
IMG 20190306 165335502
Heat technology Steam boilers Gas-fired +2

Steam and thermal oil ingeniously combined

Capacity300 kg/h
Power195 kW 
Operating pressure0,5barg 
Tekst LHS WPT PRJ10513 Guardian Luxguard
Thermal oil boilers Gas-fired Heat technology

Thermal oil puts the heat on glass in the autoclave

Output1.920 kW
FuelNatural gas
Stoom transport reiniging Callens 2
Heat technology Steam boilers Gas-fired

Cleaning system for food tankers

Output1.000 kg steam/h
Operating pressure13 barg
Working pressure10 to 11 barg
20210617 120754
Heat technology Steam boilers Gas-fired

Belgian cheese factory brings out creative dairy with the help of Belgian steam

Capacity360 kg/h
Operating pressure10 barg
Working pressure3 to 4 barg
Callens stoom geneesmiddelen
Heat technology Steam boilers Gas-fired

Medicines guaranteed safe and energy-efficient steam

Output16 t/h
Operating pressure10 barg
La Lorraine CV 850 k W PRJ210133 10
Heat technology Hot water & industrial central heating boilers Gas-fired +1

Heat excites taste buds in industrial bakery

Capacity850 kW
Efficiency95,5%
Fluxys Merelbeke TO gasontspanstation 3x465 k W PRJ4183 1
Hot water & industrial central heating boilers Gas-fired Heat technology

Central heating boilers heat gas pressure regulating station

Output3 x 465 kW
Fuelnatural gas
Callens stoomketels DEF
Steam boilers Gas-fired Heat technology

60 tons of steam for 100 % Belgian potato products

Capacity60 t/h
Working pressure24 barg
Fuelnatural gas
Callens ventilatie lucht 1
Air technology Industrial cooling

Ventilation brings in comfort

Air flow rate 140.000 m3/h
Air flow rate 280.000 m3/h 
Air flow rate 3100.000 m3/h 
Callens Vynova stoomketel waterstof 1
Heat technology Hydrogen-fired Valorizing waste flows +2

Hydrogen fires 60 tons of sustainable steam per hour

Capacity2 x 30 ton/h
Design pressure16 barg
Fuelhydrogen, natural gas, combination
CO2-reduction10.000 ton/year
Beschikbare hoeveelheid H2> 1.200 kg/h
Callens stoom geurgassen Empro 1
Heat technology Steam boilers Gas-fired +1

Odorous gases routed to burner for treatment

Capacity9 t/h 
Boiler output5,859 kW
Callens stoomketel 1
Heat technology Gas-fired Steam boilers

Steam quality brings back peace of mind

Working pressure8 barg
Efficiency95%
STT K700 ESM 2x4 T1x2 T 1
Heat technology Steam boilers Gas-fired

Steam generators heat the shore

Flow rate10 tons/uur
Set pressure8 barg
Ashland Doel TO opwarmen drooglucht 2326 k W PRJ12553 3
Heat technology Thermal oil boilers Gas-fired +1

Food safe air heating system for industrial drying tower

Capacity2,3 MW
Operating pressure10 barg
Working pressure3 barg
Scandinavian Tobacco 2x Viessmann 2 T 13b 1
Heat technology Steam boilers Gas-fired +1

Steam peaks supported by two fire-tube boilers

Capacity2 x 2 T/h
Design pressure13 barg
Callens warmte transport 2
Heat technology Steam boilers Energy recovery for thermal technology +1

Heated transport from A to B

Net capacity1300 kW
Work rate steam boiler1.7 tons/hour
Design pressure pipes10 bars
Recovered capacity83 kW
IMG 7282
Heat technology Steam boilers Combined set-up +1

Steam and central heating boiler: smart combination for greater efficiency

Output2,000 kg/h
Operating pressure6 barg
20200113 102758
Heat technology Thermal oxidizers Thermal oil boilers

Steam and thermal oil are a tasty match

Capacity2 million Kcal/h
Operating pressure8 barg
Max. temperature300 °C
Steam from baking fumes:
Capacity10 tons steam/h
Operating pressure18 barg
Working pressure16 barg
Combustion efficiency96%
Ecofrost referentiefoto
Heat technology Steam boilers Gas-fired

From spud to French fries with 30 tons of steam

Output30 t/h
Operating pressure24 barg
Working pressure20 barg
Europal Doornik ST 6 T PRJ11961 1
Heat technology Steam boilers Biogas-fired

Steam glues together the production phases of cardboard producer

Capacity6 t/h
Operating pressure18 barg
Working pressure15 barg
Callens heetwaterketel Turnhout 1
Heat technology Hot water & industrial central heating boilers Gas-fired

Hot water extracts excess moisture from confectionery

Capacity2 MW
Seal pressure10 barg
IMG 3615
Heat technology Steam boilers Gas-fired

Steam coils for containers

Output1,700 kg steam/h
Operating pressure10 barg
Callens warmtenet warmtewisselaar Nieuwe Dokken 3
Heat technology CO2 reduction Thermal oil boilers

Heat exchangers capture residual heat for Ghent sustainability project

Output1,300 kW
Operating pressuremax 16 barg
Working pressurePN16 at 100°C
Stoomketel Callens 1
Heat technology Steam boilers Gas-fired

2 x 40 tons of thermal certainty

Output2 x 40 tons of steam/h
Operating pressure25 barg
Working pressure21 barg
Microsoft Teams image 1
Heat technology Steam boilers Gas-fired +1

New backup boiler & HRSG gas turbine boost process temperature reliability

Capacity backup installation23 tons of steam/h
Operating pressure18 barg
Cargill Haubourdin E boiler 20 MW 30 T ZW
Heat technology Electrification Electrode boilers +2

Combination of e-boiler and gas boiler modernizes starch factory

Capacitye-boiler: 20 MW 
gas boiler: 20 MW
Working pressure35 barg
Callens ventilatie klant 1
Air technology Industrial ventilation Industrial heating +1

High-bay warehouse looking for stability

Air flow rate50,000 m3/h
Heating capacity300 kW
20190426 145412
Heat technology Thermal oil boilers Hot water & industrial central heating boilers

Heat grid for more sustainable energy consumption

Output6 MW + 1.5 MW
Design temperature110 °C
Design pressure16 barg
DSCF2947
Heat technology

Heat exchanger prepares flawless cleaning and heating of potato factory

Flow rate21 m3/h
Buffer tank5.200 liters
Working pressure tank5 barg
Callens referentiefoto 1
Air technology Process air Drying

Excellent ventilation for excellent fries

Capacity2 x 120,000 m3/h
Residual heat1,600 kW
Callens Aviko Poperinge 8
Heat technology Dual fuel Steam boilers +3

Steam, odor combustion, ventilation and balance of plant in one smart package

CapacityHRSG: 37 t/h 
TO: 25 t/h 
BUB: 25 t/h
20210129 100819
Air technology Industrial cooling

Ventilation cools military generators during testing

Max. cooling flow30,000 m³/h
Max. inlet air temperature35°C
Callens ventilatie labo 2
Air technology Industrial ventilation Climate control

Ventilation brings back balance to laboratory in underpressure

Max. air flow 11,780 m3/h
Heating capacity85 kW
Recovered heat80%
Callens thermische boiler klant 1
Heat technology Electrification Electric thermal oil boiler +2

Thermal craftmanship across national borders

Capacity18 kW
Flow rate12 m³/h
10 Y0018
Air technology Process air Cleaning

Air handling unit exudes safety

Capacity160.000 m3/h 
Air velocity0,4m/s
Callens afzuigsysteem 1
Air technology Extraction Industrial dust extraction

One extraction system, twice the benefit

Maximum flow rate9,000 m3/h
Maximum vacuum3,200 Pa
Callens ventilatie labo 1
Air technology Extraction Gas and vapor extraction

Laboratory puts ventilation to the test

Extraction ratemax. 18,000 m3/h
Injection ratemax. 18,000 m3/h
Antwerp Bulk Terminal Wandventilator PRJ11976 6
Air technology Industrial ventilation

Air curtain fends off dust without closing industrial hall

Capacity3000 m3 per fan
6 m3/h per fan
Volvo
Heat technology

Residual heat makes its way to the boiler room

Output2 x 12.5 MW
Operating conditions125 °C - 12 barg
Callens stoom warmterecuperatie naverbranding 1
Heat technology

Steam, heat recovery and post-combustion of baking fumes in one package

Capacity30T/h
Operating pressure24 barg
Working pressure21 barg
20180327 132151
Heat technology Hot water & industrial central heating boilers Gas-fired

Tanks at the optimum temperature

Output2,000 kg steam/h + 2 x 4,200 kg steam/h
Operating pressure12 barg
Polypeptide Braine l Alleud CV 4000 k W PRJ11945 1
Heat technology

Benefit from VR – easy installation and maintenance on site

Capacity4,000 kW
Operating pressure6 barg