Klitmøller Kraftvarmeværk A.m.b.a., Klitmøller Combined Heat and Power Plant

Klitmøller CHP is a co-operative society founded by the villagers of Klitmøller in 1994. The purpose of the company is to supply district heating to houses within the distribution area of the plant.

Klitmøller Kraftvarmeværk A.m.b.a.,
Bolwigsvej 26 Klitmøller, 7700 Thisted
www.kkvv.dk
Administration, supervision and counseling:
Thy-Mors Energi
Elsøvej 107, 7900 Nykøbing Mors, Postboks 207,
Phone: +45 96 70 22 00
post@thymors.dk
www.thymors.dk

  • Guided tours: By appointment
  • Open: By appointment
  • Booking: 2 work days prior to visit
  • Participants: By appointment
  • Admittance fee: None
  • Parking: Yest
  • Public transportation: Busstop at Krovej 300 meters from the plant
  • Toilet: Yes
  • Language: English / Danish.

 

produces heat and electricity on natural gas and is powered by two Jenbacher JMS 316 gas engines and a Danstoker natural gas fired peak load boiler.
The autonomous board of Klitmøller CHP is chosen amongst and by the consumers, but administration, supervision and consulting is carried out by Thy-Mors Energi, a local energy utility.
370 consumers are currently connected to the district heating grid in Klitmøller and the number is rising.

Engines and Boiler

Heat production at Klitmøller CHP is powered by two Jenbacher natural gas engines generating 1162 kWh heat per engine. The two 16 cylinder engines were “born” to run on gas. klitmøller_20130305-DSC_5267-Edit When the consumers’ chilled return water returns to the plant, it is run through different heat exchangers, soaking up the heat of the flue gas. The plant also disposes of a natural gas fired peak load boiler from Danstoker generating a maximum of 1450 kWh. The boiler is in operation when the price for electricity is too low to be profitable. But even in times of low electricity prices the consumers in Klitmøller still need hot water, which is then produced in the boiler since the boiler doesn’t generate electricity like the engines. With the engines the production of hot water is in fact a waste product from power production.

Electricity Production

klitmøller_20130305-DSC_5270-Edit The two Jenbacher engines each powers a generator producing 736 kWh electricity that is sold on the free electric energy market to the energy utility Neas Energy. The engines are controlled by a SCADA system (Supervisory Control And Data Acquisition) constantly monitoring the production process, making sure the engines are running when conditions at the electricity market are most profitable. This means that the plant only produces electricity in periods when the price for electricity is higher than the cost of producing it. The electric energy market is one of constantly fluctuating prices and must be monitored continuously in order to calculate the most profitable production periods. The facility is controlled by Neas Energy through the SCADA system, starting up or shutting down engines and boiler. During times of high electricity prices the engines are running at maximum capacity and excess hot water is stored in the accumulation tank. Outside the plant is an electrical substation from where electricity is distributed to the users.

Hot Water for the Consumers

klitmøller_20130305-DSC_5272-Edit The plant has two circulation pumps pumping the 70 degrees hot output water to consumers in Klitmøller. A frequency converter controls the pressure in the pumps to uphold pressure in the farthest branches of the grid where circulation controlled by thermostats prevents pockets of cold water in the grid.
The grid is monitored by electrodes embedded in the insulation of the pipes that register changes in the electrical resistance of the insulation material caused by water seeping in or out of the pipes.

Water Treatment Systems

The water used at Klitmøller CHP is run through water treatment systems when it enters the plant. Water from the public water works is potentially damaging to the district heating system, containing oxygen and minerals that may cause corrosion in pipes and installations. To compensate the water is led through a water treatment plant where it is deoxidized and demineralized. The ideal pH-value of the water lies between 9 and 10. The plant produces its own nitrogen that is used as a type of pillow of inert gas in the accumulation tank, preventing the ingress of atmospheric air which may cause corrosion in the tank.

Cooling Return Water

Many CHP plants struggle with high temperatures on the return water coming back to the plant from the customers. To make the most of the heat in the district heating water the water needs to be cooled as much as possible in the consumers’ radiators and in the heat exchanger and hot water tank. The more heat the district heating water deposits in the consumers’ installations before returning to the district heating plant, the better. A lower return temperature means a lower loss of heat in the pipes on the way back to the plant, which in turn means a better use of the exchangers transferring heat from the engines and the flue gas, ultimately resulting in cheaper heating for the consumers.
At Klitmøller CHP plant a motivation fee has been employed to ensure proper cooling of return water. Consumers returning water cooled less than the average 26 degrees cooling are liable to pay the fee.
klitmøller_20130305-DSC_5263-Edit But consumers have many options to cool return water efficiently. One trick is to set radiator valves with as little an opening as possible allowing the hot water to flow slowly through the system with sufficient time to give off heating. That is why large radiators are an advantage. Also it is more efficient to leave all the radiators in a room on, instead of letting one unit do all the work. This enables a slower flow with optimal use of the heat. Proper insulation of the house is another way of making it possible to slow down water passing in the radiators without compromising a comfortable temperature. Finally it is a good idea to adjust the temperature of the water coming into the system according to time of year. During winter throughput temperature should be high while it can be lowered during summer. Most installations are set up to let the 70 degrees hot district heating water run directly into the radiators, but by installing a circulation pump and a thermostat it is possible to adjust the throughput temperature to the temperature outside.

Investments

In 2015 Klitmøller CHP will be debt free which allows for new investments to improve the operations of the plant like for example solar heating, a heat pump and an electric boiler. Since the up start of the plant several upgrades and improvements have been made to reduce the cost of heating:

  • The Engines have been upgraded to produce 10% more energy
  • Flue gas exchanger condensation has been installed to extract any remaining energy from the flue gas
  • A nitrogen producing facility has been installed to maintain a “pillow” of inert gas at the top of the accumulation tank to replace an electrically generated steam lid
  • SCADA system which allows Neas Energy to adjust production periods to periods with high electricity prices
  • A system to control the flow temperature will be installed to reduce heat loss in the main pipes with 10% equalling 200 MW energy saving.

Prices

klitmøller_20130305-DSC_5265-Edit Each year district heating plants in Denmark submit their price lists to the Danish Energy Regulatory Authority. According to the price list of December 2012, district heating from Klitmøller CHP costs  DKK 613 per MWh VAT included. This means an annual cost of  DKK 15.508 for heating in a standard flat of 75 m2 consuming 15 MWh per year, and an annual cost of  DKK 20.508 for heating in a standard single-family house consuming 18.1 MWh per year.
The above mentioned prices are standard prices and in order to calculate the actual price for heating it is necessary to consider the actual heat consumption of a given family and the fixed costs of for example subscription. For more Danish district heating prices see www.energitilsynet.dk
Klitmøller CHP plant has an extra income by hosting a base station site as a co-location for several mobile operators at the plant. The chimney functions as a cell site tower.

Production data

  • Built in 1994
  • Two Jenbacher natural gas fired engines, JMS 316
  • Heat production: 1162 kWh per engine
  • Electricity production: 736 kWh per engine
  • 1000 h. p.
  • Gas consumption: 175 m3/h
  • One peak load gas boiler, Danstoker, maximum output 1450 kWh
  • One accumulation tank 540 m3.