District Heating in Sweden

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District Heating in Sweden

District Heating and CHP in Hallstahammar, Sweden
(Hallstahammar, Sweden)

For Hallstahammar Energi AB, FVB provided the initial concept design analysis and detail design for the central heating plant, distribution piping system, system hydraulic modeling, and building connections. FVB also provided engineering services during the project construction and evaluated the feasibility of generating electricity sequentially with district heating production (combined heat and power). The district heating demand is approx. 100 GWh/year and the peak demand is close to 40MW.
Härnösand, Sweden
(Härnösand, Sweden)

FVB has been hired by Härnösand Energi & Miljö to perform a feasibility study for a biomass fired CHP plant in Härnösand. After commissioning FVB conducted performance tests for the turbine and an economical evaluation of the project. The CHP plant is sized to supply 11.7 MW of power and 25.9 MW of thermal energy from the condenser, and 7.3 MW thermal from the flue gas condenser unit. The BFB boiler use a mix of residues from foresting and saw mills and peat for fuel. The boiler is rated at 50 ton/h at 92 bar, 510°C. The district heating demand is 166 GWh/year and the peak demand is close to 60MW. The CHP plant provides the city with 67 % of the district heating demand. The plant is relatively small compared to the DH system due to the reason that the system is provided with waste heat from a factory and that they also had a smaller biomass fired heat only boiler.
District Heating and CHP in Katrineholm, Sweden
(Katrineholm, Sweden )

For Katrineholm Energi AB, FVB provided the initial concept design analysis and detail design for the biomass-fueled central heating plant, district heating distribution system, and customer connections. The fuel preparation process included cleaning dirt and rocks from the tree residue, chipping the residue into smaller pieces, transporting and storing the fuel, and finally conveying the wood chips into the boiler. FVB also provided engineering services during the project construction and evaluated the feasibility of generating electricity sequentially with district heating production (combined heat and power).

FVB was later hired to study the feasibility of adding a biomass-fuelled CHP plant. At the time the optimum size was 14 MW of power and 31 MW of thermal energy. The district heating demand is 210 GWh/year and the peak demand is close to 80MW. The CHP plant came out to be relatively small compared to the DH system due to the reason that the company had existing coal and biomass fired heat only boilers.

Nyköping, Sweden
(Nyköping, Sweden)

FVB was hired to study the feasibility for a biomass-fuelled combined heat and power Plant installation to supply the existing District Heating System with thermal energy. FVB optimized the plant size and configuration. The combustion system is a bubbling fluidised bed. The CHP plant is sized to supply 34,8 MW of power and 58,6 MW of thermal energy from the condenser and 11,5 MW thermal from the flue gas condenser unit. The BFB boiler can be operated on wood waste, peat, coal or oil. The 97,5 MW boiler is rated at 144 ton/h at 140 bar, 540°C. The district heating demand is 300 GWh/year and the peak demand is 115MW.

The study included conceptual design and performance calculations for each option as well as capital cost estimates and financial analysis.

District Heating and CHP in Sala, Sweden
(Sala, Sweden)

For Sala-Heby Energi AB, FVB provided the initial concept design analysis and detail design for the central heating plant, distribution piping system, system hydraulic modeling, and building connections. Based on FVB’s feasibility study, Sala-Heby Energi constructed a combined heat and power (CHP) plant. From 1998 to the present (2002), FVB continues to assist Sala-Heby Energi expand their system and connect new customers.

FVB has performed the tender documents for an additional Flue gas condensation Plant and are at the moment performing the evaluation of proposals and the following documents and negotiations for purchase.

FVB is continuing the support regarding combustion optimization, control system enhancements, etc.