Poly-generation process for gasification of dairy manure with fixed beds

In order to reduce greenhouse effect and environmental pollution caused by natural fermentation of cow dung and also to reduce the cost and increase benefits of the dairy farming, the dairy manure was gasified using homemade fixed bed SGL gasifier. The dairy manure gasification can get three products, such as flammable gas, dairy manure carbon and pyrolysis extract liquid. These three products were recycled to achieve the goals of emission reduction and pollution control. The influences of water content, gasification temperature and equivalence ratio were studied, and the results showed that the optimal gasification parameters were raw material 12%～18%, gasification temperature 850～900℃ and equivalence ratio 0.25～0.30. When dairy manure moisture was 17.78%, gasification temperature was 850℃ and equivalence ratio was 0.30, the yield of gas was 1.42 m3/kg, the inferior calorific value was 2.84 MJ/m3, the yield of dairy manure carbon was 23.82% and the yield of pyrolysis extract liquid was 24.17%. Dairy manure gasification of poly-generation process experiment can provide a theoretical basis for engineering implementation.