Heat recovery of compost reactors: field study of operational behaviour, heating power and influence factors

• Autorzy: Jaschke Nele , Schmidt-Baum Torsten

Identyfikatory

DOI

10.2478/eces-2021-0015

• Języki publikacji: EN

Abstrakty

EN

This study evaluates the common process and set-up design of a static compost bioreactor for heat recovery. A technology, which fits the goal of a sustainable, growing bioeconomy which combines the utilization of compost heat and compost material. Interest on this technology has been growing the last years but precise data of pilot scale reactors is rare. Data is required to adjust the process for custom needs and further technical development. Therefore, lignin-cellulose based biomass was composted in unaerated cylindrical compost reactors size 20 to 70 m3 for 140 days. The biomass comes with C:N ratio of about 25:1, water content of 43-48 %, organic matter content of 40.6 % d.m. and calorific value of 8.3 MJ/kg d.m. Spatial distribution of temperature and gas concentration (oxygen, carbon dioxide, methane) within the reactor shows methane production of the anaerobic core area. Maximum thermal power of 5.2 kW from a 63 m3 reactor with average temperature of heating flow about 40 °C was reached. Maximum recovered heating power of 4.8 MJ/kg d.m. was calculated for an operation of 6 month. This corresponds to 50 % of the measured calorific value. Biggest influence factors detected on the recovered heating power of the pilot scale reactor has been the size of reactor, the set up quality and the control of heat exchanger. The spatial correlation between heat production and aerobic digestion suggests a technical development in terms of aeration.

Słowa kluczowe

EN

biomass energy; composting; passive aeration; heat exchanger; gas concentration

PL

energia biomasy; kompostowanie; napowietrzanie pasywne; wymiennik ciepła; koncentracja gazu

• Wydawca: Towarzystwo Chemii i Inżynierii Ekologicznej
• Czasopismo: Ecological Chemistry and Engineering. S
• Rocznik: 2021
• Tom: Vol. 28, nr 2
• Strony: 201--217
• Opis fizyczny: Bibliogr. 41 poz., tab., il., zdj., wykr.

Twórcy

autor

Jaschke Nele

• Deutsches Biomasseforschungszentrum, Bioenergy Systems Department, Working Group Biomass in the Energy System, Torgauer Straße 116, 04347 Leipzig, Germany, phone [phone]

autor

Schmidt-Baum Torsten

• Deutsches Biomasseforschungszentrum, Bioenergy Systems Department, Working Group Biomass in the Energy System, Torgauer Straße 116, 04347 Leipzig, Germany, phone [phone]

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Uwagi

1. Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021).

2. The project underlying this report was funded by the German Federal Ministry of Education and Research (BMBF) under grant number 031B0244. The responsibility for the content of this publication lies with the authors. This research would not have been possible without the expert advice of Dr. Joachim Brummack from TU Dresden and the committed work of Heiner Cuhls of Native Power e.V., Max Koch from Green Energy Monitoring and Hannes Jaschke.