Vesløs Varmeværk A.m.b.a., Vesløs District Heating

Vesløs District Heating Plant is a 100 % CO2 neutral wood briquette fired plant founded in 1994 with the one purpose of producing heat for the village of Vesløs. Producing 4 million kWh per year Vesløs District Heating now supplies 130 households with hot water. Connection to the grid within the supply area is not mandatory.

Vesløs Varmeværk
Møllebakvej 4, 7742 Vesløs
Phone +45 97 99 30 33.

  • Guided tours: By appointment
  • Open: By appointment
  • Booking: 2 work days prior to visit
  • Participants: By appointment
  • Admittance fee: None
  • Parking: Yes
  • Public transportation: Bus stop 500 meters from the plant
  • Toilet: Yes
  • Language: English / Danish.

 


vesløs_fjernenergi_03242010_98is fueled by wood briquettes from local furniture manufacturer NJA Furniture who delivers around 900 tons of briquettes to the plant per year. The briquettes are a waste product from the production of wooden furniture and consist of sawdust pressurized into briquettes. Moisture content in the briquettes is very low, about 8-10%, which adds considerably to the expected lifespan of the boiler compared to boilers using wet fuel like wood chips.

Automatic and Efficient

In 2011 the electrical control system of the district heating plant in Vesløs was renewed and a new SCADA system installed. The acronym SCADA stands for Supervisory Control And Data Acquisition. The primary purpose of SCADA is to monitor, control and alarm the plant from a central location. The investment was made partly to save electricity and optimize production and partly because spare parts for the existing system were getting hard to come by.
vesløs-fjernvarme_20130218-DSC_4950-Edit Vesløs District Heating Plant has two 450 kWh boilers in operation, but during summer only one of them is running. Via frequency controlled spiral conveyors inside the wood briquette container located in the yard, the briquettes are fed into the boilers. Being set up with frequency control the boilers are fed the exact amount of fuel needed at any given time.

Flue Gas Cleaning

On account of its moderate size the plant in Vesløs is exempt from paying the Government’s NOx fee which only applies to district heating and CHP plants producing more than 1 MW per year. The flue gas stream contains a certain amount of pollutants and the NOx fee is charged for the amount of nitrogen oxide and nitrogen dioxide released into the air. But even though Vesløs District Heating Plant is exempt from the NOx tax the pollutants still need to be removed from the flue gas before releasing it into the atmosphere. The flue gas from the boilers is led through a cyclone where the gas swirls around forcing the particles to the cyclone cylinder wall from where they fall to the bottom while the cleaned gas exits through the top of the cyclone.

Operation and Maintenance

In 2019 Vesløs District Heating Plant will be debt free and even though the plant by then will be 25 years old there are no current plans for major renovations. Boilers for dry solid fuel have a longer life expectancy than boilers for wet fuel like wood chips with an expected lifespan of around 25 years. In addition the plant carries out inspection of the pipes on a regular basis. Each year the pipe system is monitored by an infrared camera detecting faults in time to avoid serious damage or actual downtime. Recently it was discovered that rainwater was sifting through the pipes into the insolation. If undetected this would eventually lead to moisture condensation causing corrosion in the pipes. vesløs-fjernvarme_20130218-DSC_4948-Edit Every year the plant visits all consumers reading the meter and checking the installations. The visits also offer an opportunity to discuss energy saving and the correct usage of district heating. Flow temperature is about 81 degrees while return temperature should be 40 degrees. If the return temperature is over 40 degrees it is an indication that the heat has not been properly exploited in the consumer household, which adds to the plant’s production expenses.Vesløs district heating has entered into a partnership with two other minor district heating plants in the area, Østerild and Frøstrup. The plants cooperate by taking turns keeping the weekend watch at the three plants, and Østerild and Frøstrup buy fuel in conjunction.

Water Quality

The water in district heating systems circulates in a closed circuit between the plant and the consumers. The quality of the water is paramount to production efficiency and is constantly monitored. If the oxygen level in the water is too high it will cause the pipes to corrode. Likewise the pH value in the water is measured to maintain the ideal value of between 9 and 10.

Prices

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 Vesløs Varmeværk costs DKK 615 per MWh VAT included. This means an annual cost of DKK 17.125 for heating in a standard flat of 75 m2 consuming 15 MWh per year, and an annual cost of DKK 19.063 DKK for heating in a standard single-family house consuming 18.1 MWh per year. vesløs-fjernvarme_20130218-DSC_4959-Edit
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

Production data

  • Founded 1994
  • In 2002 new storage building
  • In 2011 new SCADA system, Weiss
  • Two 450 kWh wood briquette fired boilers, Danstoker / Justesen.