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Poultry litter gasification in a fluidised bed reactor: effects of gasifying agent and limestone addition
Pandey, Daya Shankar; Kwapinska, Marzena; Gómez-Barea, Alberto; Horvat, Alen; Fryda, Lydia E.; Rabou, Luc P. L. M.; Leahy, James J.; Kwapinski, Witold
This article corresponds to chapter 3 of Ph.D: Experimental and mathematical modelling of biowaste gasification in a bubbling fluidised bed reactor Pandey, Daya Shankar URI: Air and air-steam gasification of poultry litter was experimentally studied in a laboratory scale bubbling fluidised bed gasifier at atmospheric pressure using silica sand as the bed material. The effects of equivalence ratio (ER), gasifier temperature, steam-to-biomass ratio (SBR) and addition of limestone blended with the poultry litter, on product gas species yields and process efficiency, are discussed. The optimum conditions (maximum carbon conversion, gas yield, heating value and cold gas efficiency) was achieved at an ER 0.25 and 800 ºC, using air (SBR = 0) and poultry litter blended with 8% w/w limestone, yielding a product gas with a lower heating value (LHV) of 4.52 MJ/Nm3 and an average product gas composition (dry basis) of H2: 10.78%, CO: 9.38%, CH4: 2.61 and CO2: 13.13. Under this optimum processing conditions, the cold gas efficiency (CGE), carbon conversion efficiency (CCE) and hydrogen conversion efficiency (HCE) were 89, 73 and 43% respectively. The reported NH3 measurement at an ER of 0.28 and 750 ºC is 2.7% (equivalent to 19,300 mg/Nm3) with 14.7 mg/Nm3 of HCl observed the dry product gas. High temperature and steam injection favour production of CO and H2 while their effect on CH4 was almost negligible. It is demonstrated that poultry litter can be gasified by blending with limestone, making it possible to overcome the fluidisation problems caused by the mineral composition of poultry litter ash ( high K and P content), yielding a gas with a similar heating value compared to gasifying without limestone addition, but with a significantly lower tar content.
Keyword(s): livestock production; poultry; limestone
Publication Date:
Type: Other
Peer-Reviewed: Yes
Language(s): English
Institution: University of Limerick
Funder(s): Enterprise Ireland; Higher Education Authority
Citation(s): info:eu-repo/grantAgreement/EC/FP7/289887
Energy and Fuels;30 (4), pp. 3085-3096
Publisher(s): American Chemical Society
First Indexed: 2018-09-01 06:26:35 Last Updated: 2018-09-02 06:26:33