Abstract
The paper presents a technology for biomass and waste gasification/pyrolysis with use of flue gas as a converting agent. This technology includes a rotary reactor that operates continuously and is integrated with a power boiler, for example WR-25 type grate boiler. Process gas (syngas) as well as possible char being a result of the process are combustible and can be recirculated to the boiler’s combustion chamber. The paper presents laboratory research of selected biomass and waste: Refuse derived fuel (RDF), wood chips, nut shells, sewage sludge, coal sludge, mixture of 50% coal sludge with 50% RDF. Basing on the laboratory research a calculation procedure was developed to determine an industrial-size process parameters. The procedure allows to calculate how much fuel can be gasified/converted in a rotary reactor and the reactor’s dimension: inner diameter Dwr and length Lr.
Highlights
According to actual Polish law [1] it is forbidden to store waste that can be characterized by: a) Total organic carbon (TOC) content above 5% of dry matter, b) loss on ignition (LOI) above 8% of dry matter, c) lower calorific value above 6 MJ kg of dry matter
Experimental laboratory research was conducted to develop design requirements and to identify the usability of the selected alternative fuels for indirect co-firing in power boilers
It takes into account that 2,5% of flue gas from WR-25 boiler is provided to the gasification reactor
Summary
According to actual Polish law [1] it is forbidden to store waste that can be characterized by: a) Total organic carbon (TOC) content above 5% of dry matter, b) loss on ignition (LOI) above 8% of dry matter, c) lower calorific value above 6 MJ kg of dry matter. Presented laboratory research and calculation procedure have been developed due to strong need for creating new technologies for waste and biomass thermal conversion. Flue gas is taken from the combustion air duct – 8 by the stream of a working agent (water steam, compressed flue gas) supplied to the nozzle – 12 by injector – 10. These flue gas enters the reactor – 15 where the thermal treatment of biomass is made. The output of the flue gas injector – 10 is adjusted to the process requirements by a control valve – 7 built in the propeller duct – 6 to the drive nozzle – 12. Flue gas flowing out from the reactor – 15 with flammable gas products of the degradation process feeds the burners – 3 and 4, and solid flammable and non-flammable products are transported through the lock – 14 and possibly returned to the process
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