Study On The System Of Tar Disposition In Domestic Dual Chamber Water-cooled Biomass Gasifier

With the enhancement of folk’s standard in the vast rural places recently, theenergy consumption is increasing, causing the fees of the coal and natural-gas energyincreases constantly that leads to the rise of living cost. The widely use ofbio-gasification technology could solve the embarrassed problem effectively, butcome into being another trouble of tars disposition. Inappropriately disposition of tarsnot only pollutes the environment but becomes a threat to operator.Therefore, in this paper, a solution to cooling, condensing, and decomposing oftars is proposed, which reduces the tars effectively and cuts down the pollution. Inaddition, its exploitation and application could enrich the knowledge of the bio-tarsand have a tremendous academic value and provides a guide in the use of engineering.In this paper, combining fundamental theory analysis with software FLUENTand experiment validation to study the cooling system and performance of pyrolysis.The main achievements are as follows:(1)Dual chamber gasifier to be designed for filtering the ash content of impuregas effectively, the tar in gas is refrigerated by the water-cooled heat exchangerequipment. The design of3D cooling equipment model with Pro/ENGINEER5.0;Simplifying the model as2D impure gas model, meshing it with GAMBIT2.1,simulating it in FLUENT and analyzing the outcomes; The development of device forcollecting cooled tars. An auto-facility will be designed to collect the cooled-tar at thesame time.(2)Analysis the influence of nozzle structure on disposing tars. The design ofdecomposing device at elevated temperature: low pressure diffuse-eject-air burnerafter analyzing the influence of nozzle structure to entity system; Simulation of thesystem under the guide of theoretical model to analyze the affection of gas flux v,nozzle diameter d, wall distance L on burning characteristics; Consideration of the three factors’ influence on burning areas with orthogonal experiments.(3)Undertaking experiment with optimized parameters, the results of experimentagree with theoretical and simulating outcomes, rationality and validity of the modelare verified.The synthesizing results show that: in the three factors, the nozzle diameter hasthe greatest influence on the burning area, the wall distance L following, primaryinletting air v has the least. With the nozzle diameter d=4mm, gas flux v=0.10m3/h,wall distance L=18mm, the burning area and temperature situation is preferable. Thedevice of four combustions arranges homogenous to decompose tars completely. Thevalidity of the optimized model has been proved by experimental certification, theerror between pyrolysis and simulation is3%and the destination is achieved.