Resumé

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ENVIRONMENT-FRIENDLY DISTRICT HEATING TO THE GREATER COPENHAGEN AREA

The Metropolitan Copenhagen Heating Transmission Company, CTR for short, is a partnership formed in 1984 by the municipalities of Frederiksberg, Gentofte, Gladsaxe, Copenhagen and Taarnby.

CTR has the objective of supplying the individual recipient municipalities and local heat supply enterprises with district heating, primarily based on surplus heat from waste to energy plants and combined heat and power generation plants (CHP plants). Heating plants based on fossil fuels are used in peak-load and/or back-up situations.

CTR's assignments cover the purchase of heat from production units, heat generation in its own peak-load and back-up units, transport through the transmission system and sales to the five Partnership Municipalities, as well as the exchange of heat with Vestegnens Kraftvarmeselskab I/S (VEKS). Moreover, CTR is in charge of the planning, establishment, funding and further development of the entire transmission system. Finally, CTR participates as an associate by investing in and operating a geothermal facility and a test heat pump connected to the sewer from which facility heat is also received.

CTR is responsible for developing and operating the transmission system – a 54 km transmission network, 3 booster pump stations, 14 peak-load units and 27 heat-exchanger stations – from which the heat is transmitted to the local district heating systems in the partnership municipalities.

CTR's objective is to purchase, transport and supply district heating and in special situations to supplement this by production of heat from its own peak-load units. The heat is transported in a transmission system that is owned by CTR. Heat consumers in CTR's partnership municipalities – Frederiksberg, Gentofte, Gladsaxe, Copenhagen and Taarnby – meet their heating requirements through CTR via the utilization of excess heat from refuse incineration plants and CHP plants, etc.

Heat purchase, monitoring and delivery are managed from CTR's control room in Frederiksberg via an extended control, regulation and monitoring system.

CTR fills an important task in implementing the political strategy for a CO2 neutral capital in 2025. The important and necessary green transition from fossil fuels to biomass on the power plants include not only new technical solutions to be implemented but also complicated negotiation of new contracts with the power companies in order to find solutions that support the transition. Another and even more complicated task is to convert CTR’s own fossil fuel based peak and reserve units to a CO2 neutral production within a reasonable economical framework.

TECHNICAL FACTS AND FIGURES

Estimated gross annual demand for heat, 2018

18.531 TJ

Basic load capacity

1.037 MJ/s

Peak load capacity

855 MJ/s

Transmission network lengh, double pipes

54 km (34 miles)

Heat exchange systems (31) installed effect

1.944 MJ/s

Booster pump station (4) installed effect

7.245 kW

Maximum flow temperature

120°C (248°F)

Operating pressure

25 bar (350 psi)

Construction costs

3,1 mia. kr. (425 mio. US$)

Five years in Figures

 

2014

2015

2016

2017

2018

           

Heat sale (TJ/year)

   18.211

19.670

20.485

20.615

21.421

Of which:

         

● Sales to partner municipalities

   15.993

16.993

17.785

18.246

18.692

● Sales to VEKS

     2.218

2.677

2.700

2.370

2.729

           

Heat purchase from partner municipalities

16.057

17.082

17.942

18.353

18.779

Of which:

         

● Waste incineration

     3.930

3.815

3.575

3.877

4.913

● Geotherma

         45

10

34

11

3

● CHP

   11.324

12.264

12.971

13.317

11.622

● Peak load

       757

993

1.361

1.148

2.242

           

Heat loss (net loss and standstill heat) (TJ/year)

64

89

157

107

87

Water loss (m3/år)

95.942

85.180

40.360

63.157

   97.378

Cooling (°C)

56

60

60

61

61

Electricity consumption (GWh)

67

68

74

75

79

Accumulated at Avedøre and Amager Power Station (TJ/year)

         

● Delivered

     1.100

     1.154

     1.242

     1.172

1.130

● Received

       764

751

886

774

781

Connected production capacity (MJ/s)

     1.887

1.920

1.878

1.963

1.977

Of which

         

● Base load

     1.079

1.079

1.037

1.122

1.113

● Peak load

       808

841

841

841

864

Maximum load (MJ/s)

     1.511

1.456

1.519

1.649

     1.701

Transmission system in operation (km)

         54

         54

         54

         54

         54

Stations in operation, number

         35

         35

         35

         35

         35

Number of CTR employees

         30

         30

         32

         32

         32