Simulation on combustion characteristics of fully premixed water-cooling gas boiler with compact slit structure
To solve the problems of high pollutant emission and large volume of traditional gas boilers,a fully premixed condensing gas boiler was developed.The boiler adopted side-by-side water-cooling plate fins inserted to form the burner head and the condensing heat exchange section.The furnace was between the burner head and the condensing heat exchange section.The boiler body was produced by extrusion aluminum process,with compact structure,strong heat transfer ability,corrosion resistance,simple process and low cost.Due to the symmetry of the model,the flow field,temperature field,flame length and pollutant emission characteristics of the basic unit were studied by numerical simulation.And the simulation results were verified by the combustion experiment.The results indicate that the boiler has a uniform flow field in the load range of 12-24kW.It is easy to ignite and burn stably.When the distance between the blunt body and the outlet of the fire hole is 4mm,the width of the blunt body is 1.0mm,the excess air coefficient is 1.2 and the combustion chamber length is 120mm,the NOx emissions are less than 95mg/m3 and the CO emissions are less than 50mg/m3 at the full load of 24kW.The size of the boiler body is only 229mm×251mm×60mm.The boiler achieves ultra-compact and low emissions,which has important practical guiding significance for energy saving,emission reduction and low-carbon design as well as transformation of fully premixed water-cooling gas boiler.
fully premixedwater-coolinggas combustionenergy conservation and emission reductionlow carbon
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