Resources for district heating

Transcription

1 Resources for district heating Excess heat from industry Solar radiation Heat sources for large heat pumps Resources from waste Biomass resources from farming Biogas resources from industry (Excess heat from electricity production) (Geotermal heat)

2 Excess heat from industry. Where to find it Generally where industries have large fuel consumption (industry with CO 2 quotas) Technology Description Boilers Recovery of heat from flue gasses Drying and heating Recovery of heat from air Evaporation Recovery of heat from condensate Melting processes Recovery of heat from air and water cooling Compressed air Recovery og air from oil cooling Refrigerating Recovery of heat from oil cooling and condensator Hydraulics Recovery of heat from oil cooling

3 Step two. Mapping of resources Excess heat from industry. What to be aware of: 1. The potential (temperature, flow hour by hour) 2. Flow- and return temperatures in the district heating system 3. Alternative heat production in the district heating system 4. Distance to district heating 5. How complex is it to utilise the heat 6. Taxes and charges

4 Excess heat from industries. How to find it: 1. Find industries with large consumption 2. Contact the industries 3. Send questionnaire (amount and temperature level hour by hour, willingness to be an industrial prosumer ) 4. Visit the industries. Many industries want to be branded as green. 5. Send meeting notes for approval 6. Make a report

5 Solar radiation

6 Heat sources for large heat pumps Source Potential (DK) Technical limits Sea water No limits in costal areas Water temperatures below 2 o C Lakes and rivers Environmental limits Water temperatures below 2 o C Ambient air No limits Air temperatures below 8 o C Excess heat MW Depend on type of production Sewage water 350 MW No obvious limits Ground water MW No obvious limits Drinking water 265 MW No obvious limits Solar heat 300 MW Only in Winter period storages

7 Resources from waste Data are available from the Danish Energy Agency because waste incineration plants report consumption of fuel. Waste handling companies know the amount of organic waste For Region Central Denmark the amount of waste is 447 kg/inhabitant 54% is organic with an average dry matter content of 35% There is 1.27 mio. Inhabitants Dry matter amount: 107,000 tons

8 Biomass resources from farming Energy crops, normal areas 12 tons dry matter/ha (16 GJ/ton) Energy crops, fallow areas 10 tons dry matter/ha (16 GJ/ton) Straw 2.2 tons dry matter/ha (17 GJ/ton) Wood from forest 1.5 tons dry matter/ha (16 GJ/ton) Wood from forest, future 2.25 tons dry matter/ha (16 GJ/ton) (50% as wood chips) Grass on wet areas 3.5 tons dry matter/ha (350 m 3 CH 4 /ton) 75% of slurry utilised Pig slurry: 300 m 3 CH 4 /ton dry matter For biogas Cattle slurry: 200 m 3 CH 4 /ton dry matter

9 Biomass resources from farming, Region Central Denmark TJ/år Husdyrsgødning Energiafgrøder Halm Brænde og træflis

10 Biogas resources