Welcome

Christian Mortensen

Marine engineer

Employed at DONG/DTU since 2/2001

Graduated in Aalborg 12/1998

Background FLS miljøAlfa laval

Who is DONG Energy

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Distribation of Natural gasDistribation of Electricity

What do we do?

District heating and electricity

Electricity for the national grid (50 KV)

District heating for DTU and Holte district heating

Our electricity is expensive but energy efficient

In the bigger power plants some of the heat is wasted

The background for building this plant is that we have a legal advantage, because of our energy efficacy.

We are located here because we are closer to the heat consumers

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The DTU power plant

Type: combined circle power plant (GT + boiler + DT)

commissioned: 1998

Capacity: 31+7 MW electricityog 31 MJ/s heat

Fuel: Natural gas

Start up time: 45 min – 90 min

Total efficacy. 88%

Price US$ 50 mill

Annual revenue US$ 20 mill

Why Combined circle power plant

The plant is small.

The boiler is small compared to a boilers with burners.

Lower temperature on exhaust gasses, which leads to use of less expensive materials for the boilers.

In total cheaper boiler - cheaper plant.

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Production and consummation at DTU power plant

Annual electricity production is about 160 mill kWh, equivalent to consummation in 40.000 households

Annual district heating production is about 130 mill kWh equivalent to consummation in 9.000 House holds

The Natural gas is supplied by the national city grid and the consummation is about 30 mill Nm3 a year

Running pattern

Winter full speed

Spring, Summer and Fall. Start every day. Running when the electricity prices are best, charting the heat accumulator tank. (Kap. 300 MWh)

Monitored from KYV (24/7) (staff present weekdays 7 am – 3 pm) (always one on call)

Annual stop 2-5 weeks a year

Break down 1-5 times a year

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Processen i kraftvarmeværket på DTU

1. Gasturbine 2. Generator 3. Dampkedel4. Dampturbine5. Generator6. Fjernvarmeveksler7. Varmeakkumulatortank

A. Fjernvarme retur (kold)B. Fjernvarme frem (løb)C. El net (10/50kV) D. Naturgas 16bar net E. Fødevand til kedelF. Damp til dampturbine

1. Gas turbine2. Generator3. Boiler 4. Steam turbine5. Generator6. District heating heat

exchanger7. Heat akkumulator tank

Main komponents at the DTU power plant

:)

Volume: 8000 m3

Partly submersed

Diameter: 19,3 meter

Height: 27,4 meter

Energy kap about: 300 MWh

Connected to the open air

Expansion for district heating system

The Gas turbine

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Shaft effiancy: 39%Price about: US$ 8,5 Mill.

•Kompressor m. pitch reg.•Buning chambre•HP-turbine•Power turbine•Start motor

Starting the turbine:

Boiler is ready for start up

Hydraulic motor drives the turbine to 2100 rpm

Flushing the boiler.

Ignition.

warm up of turbine – running towards 9000 rpm

Synchronizing of power turbine / generator.

Powering up towards 31 MW EL

The limitation is the temperature on the first turbine wheel in the power turbine

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Problems concerning the gas turbine

•Very exact tolerances makes warming and cooling time consuming.

•Materials have to withstand high temperatures

•Specialists are needed repair the turbine

Steam turbine

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The boiler

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Dobble drum boiler with economizer and over heater

Common feedwater tank

District heating economizer

HT 35t/h 5000 C 50 bar

LT 8 t/h

Gaskompressorer Nuovo Pignone (Italien)

2 stk 100% maskiner

Stempelkompressorer (rækker-konfig.)

Dobbeltvirkende

2 trins kompressorer

drevet af 300 kW el-motor

Hæver trykket fra net tryk ca 16 bar til ca 32 bar

7000Nm3/h (fuldlast)

Problematiske at drive

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Vand behandling -fra HOH Water Technology – www.hoh.dk

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Blødgøring "fjerner kalk" for beskyttelse

af RO

RO fjerner de fleste salte800 mircoSiemens/cm -

8 microSiemens/cm

Polering med kationbytter og til sidst med mixbed8 mircoSiemens/cm –50 NanoSiemens/cm

Sidste trin: Konditioneringmed NH3 og NaOH (baser for an undgå rust)doserings pumper

Ionbyttermasse

Vi er bange for Især:syrlige salteSilica (Sio2)

MircoSiemens/cm =(1/(ohm*10-6))/cm

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Tekniske data

Questions please ?

What do we do? practical info - safty

Everybody have to follow me at all times, and please do not touch anything

wear a helmet

wear earplugs

The plant is very noisy, so I will only stop for short messages. Questions are welcome but we have 98 dB

It is difficult to see the components, they are incased

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