THERMAL SCIENCE

International Scientific Journal

Thermal Science - Online First

online first only

Low grade heat recovery system for woodfuel cogeneration plant using water vapour regeneration

ABSTRACT
The paper analyses low grade heat recovery problem for modern woodfuel cogeneration plant. The woodfuel flue gas, behind the condensing economizer, still contains a considerable amount of heat, main part of which is the latent one. To recover this low grade heat, the heat pump technology can be used, which is related with additional consumption of energy (electric, mechanical or heat). Another technique that could be applied is a heat regeneration when flue gas heat, mostly latent, is transmitted to air blown towards burning chamber. Therefore, the analysed heat recovery system operates mainly like mass regenerator which contains only blowers that use some electric energy. The regenerator consists of two cyclically operating columns with packing material. Energetic analysis demonstrates that 13% of additional heat can be produced utilizing this low grade heat. The economic valuation shows that investment in a heat recovery system is quite effective; the payback time is about 4 years.
KEYWORDS
PAPER SUBMITTED: 2017-10-20
PAPER REVISED: 2018-01-12
PAPER ACCEPTED: 2018-01-31
PUBLISHED ONLINE: 2018-03-04
DOI REFERENCE: https://doi.org/10.2298/TSCI171020081D
REFERENCES
  1. International Renewable Energy Agency (2015) Biomass for Heat and Power. Technology Brief. IEA-ETSAP and IRENA Technology, Brief E05, pp. 10-12. biomasspower.gov.in/document/Reports/IRENA_Biomass%20for%20Heat%20and%20Power.pdf
  2. Hebenstreit B., Schnetzinger R., Ohnmacht R., Hoftberger E., Haslinger W. (2011) Efficiency optimization of biomass boilers by a combined condensation-heat pump-system. Proceedings of ECOS 2011, Novi Sad, Serbia, July 4-7.
  3. Hebenstreit B., Schnetzinger R., Ohnmacht R., Hoftberger E., Lungren J., Haslinger W., Toffolo A. (2014) Techno-economic study of a heat pump enhanced flue gas heat recovery for biomass boilers. Biomass and bioenergy 71: pp. 12-22.
  4. Wang L., Ziegler F., Roskilly A.P., Wang R., Wang Y. (2013) A resorption cycle for cogeneration of electricity and refrigeration. Applied Energy 106: pp. 56-64.
  5. Lu Y., Bao H., Yuan Y., Wang Y., Wang L., Roskilly A.P. (2014) Optimization of a novel resorption cogeneration using mass and heat recovery. Energy Procedia 61: pp. 1103-1106.
  6. Donnellan Ph., Cronin K., Byme E. (2015) Recycling waste heat energy using vapour absorption heat transformers: A review. Renewable and Sustainable energy 42: pp. 1290-1304.
  7. Ishida M., Ji J. (2000) Proposal of humid air turbine cycle incorporated with absorption heat transformer. Int. J. Energy Res. 24(11): pp. 977-87.
  8. Romero R. J., Martínez A. R., Silva S., Cerezo J., Rivera W. (2011) Comparison of double stage heat transformer with double absorption heat transformer operating with Carrol-Water for industrial waste heat recovery. Chem. Eng. Trans. 25: pp. 129-34.
  9. Huicochea A., Romero R., Rivera W., Gutierrez-Urueta G., Siqueiros J., Pilatowsky I. (2013) A novel cogeneration system: a proton exchange membrane fuel cell coupled to a heat transformer. Appl. Therm. Eng. 50(2): pp. 1530-1535.
  10. Kumar M., Das R.K. (2017) Experimental analysis of absorption refrigeration system driven by waste heat of diesel engine exhaust. Thermal Science, 2017 OnLine-First(00), pp.3-3.
  11. Lund H., Moller B., Mathiesen B.V., Dyrelund A. (2010) The role of district heating in future renewable energy systems. Energy 35: pp. 1381-1390.
  12. Eriksson M., Vamling L. (2005) On the future role of heat pumps in Swedish district heating systems - competition with waste incineration and combined heat and power under greenhouse gas emission restrictions. In: 8th International Energy Agency Heat Pump Conference - Global Advances in Heat Pump Technology, Applications and Markets. Las Vegas, USA.
  13. Blarke M., Lund H. (2007) Large-scale heat pumps in sustainable energy systems: system and project perspectives. Thermal Science 11(3): pp. 143-52.
  14. Lazzarin R., Noro M. (2006) Local or district heating by natural gas: Which is better from energetic, environmental and economic point of views? Applied Thermal Engineering 26(2-3): pp. 244-250.
  15. Burer M., Tanaka K., Favrat D., Yamada K. (2003) Multi-criteria optimization of a district cogeneration plant integrating a solid oxide fuel cell-gas turbine combined cycle, heat pumps and chillers. Energy 28: pp. 497-518.
  16. Lowe R. (2011) Combined heat and power considered as a virtual steam cycle heat pump. Energy Policy 39: pp. 5528-5534.
  17. Dagilis V. (2013) Combined heat pump and power plant. Part I: thermodynamic analysis. Mechanika 19 (1): pp. 19-24.
  18. Jonsson M., Yan J. (2005) Humidified gas turbines - a review of proposed and implemented cycles. Energy 30: pp. 1013-1078.
  19. Shen S., Cai W., Wang X., Wu Q., Yon H. (2017) Investigation of liquid desiccant regenerator with heat recovery heat pipe system. Energy and Buildings 146: pp. 353-363.
  20. Guillen-Lambea S., Rodriguez-Soria B., Marin J.M. (2017) Control strategies for energy recovery ventilators in the South of Europe for residential nZEB -quantitative analysis of the air conditioning demand. Energy and Buildings 146: pp. 271-282.
  21. Swithenbank J., Chen Q., Zhang X., Sharifi Vida. (2011) Wood would burn. Biomass and Bioenergy 35: pp. 999-1007.
  22. Owens E., Cooley S. (2013) Calorific value of Irish woodfuels. Coford Connects, Processing/Products №32, pp. 1-8. www.woodenergy.ie/media/woodenergy/content/woodfuelsstovesandboilers/PP32.pdf
  23. National Energy Technology laboratory. (2015) Cost and Performance Baseline for Fossil Plants. U.S. Department of Energy, pp. 38-46. www.netl.doe.gov/File%20Library/Research/Energy%20Analysis/Publications/Rev3Vol1aPC_NGCC_final.pdf
  24. Vatopoulos K., Andrews D., Carlsson J., Papaioannou I., Zubi G. (2012) Study on the state of play of energy efficiency of heat and electricity production technologies. European Commission, pp. 46-50.
  25. Sayyaadi H., Mehrabipour R. (2012) Efficiency of a gas turbine cycle using an optimized tubular recuperative heat exchanger. Energy 38: pp. 362-375.
  26. Shen Q., Finney K., Li H., Zhang X., Zhou J., Sharifi V., Swithenbank J. (2012) Condensing boiler applications in the process industry. Applied Energy 89: pp. 30-36.