Research On Structural Improvement And Soot Capture Effect Of Household Integrated Cooker

With the continuous improvement of social and economic level,people’s demand for indoor environment quality is increasing.Among them,cooking fumes is one of the main sources of pollution in indoor environment,its composition is extremely complex and contains many harmful pollutants,long-term inhalation of fumes will cause significant harm to human health.As a new and efficient way of exhausting grease smoke,integrated cooker is getting more and more people’s attention and use.However,with the increasing demand for grease capture effect and the strengthening of national grease emission standards,how to further improve the grease capture efficiency of integrated cookers has become a widespread concern in academic circles at home and abroad.In this paper,we use numerical calculation method to study the grease capture effect of residential kitchen side suction integrated cooker under different air volumes and cooking methods,analyze various factors affecting the capture efficiency,and carry out the improvement design of smoking area structure to improve the grease capture efficiency of integrated cooker under low air volume.First of all,the formula for the soot capture efficiency of side suction cooker was proposed based on the formula for the soot capture efficiency of upper suction cooker and the soot capture efficiency of integrated cooker under different air volumes and cooking methods was studied.It is found that the best value of air volume should be considered by many factors such as fan energy consumption,soot capture efficiency,etc.In order to achieve the best soot capture effect and avoid additional energy consumption,it is recommended to set the exhaust air volume to 400 m~3/h(steaming),500 m~3/h(frying)and600 m~3/h(stir-frying)for light duty cooking and heavy duty cooking,respectively,under different cooking methods and different air volumes.Secondly,in order to investigate the advantages and disadvantages of side suction hob and top suction hood,this paper compares and analyzes their soot capture effects under different air discharge volumes for heavy-duty cooking(deep frying).When the exhaust volume is less than 380 m~3/h,the smoke capture efficiency of the top-absorbing hood is better than that of the side-absorbing integrated cooker.On the contrary,when the air volume is greater than 380 m~3/h,the capture efficiency of the side suction cooker is significantly better than that of the top suction cooker.Finally,in order to improve the grease capture effect of the integrated cooker under low airflow,improvement solutions are proposed from two perspectives of basic structure and air curtain for the structure of the smoking area of the integrated cooker.The influence of three basic structural parameters,namely,the height of the smoke baffle,the width of the top plate and the distance of the stove from the smoke baffle,on the soot capture effect was analyzed through orthogonal experiments.Based on the structural improvement,an air curtain was added to further improve the grease capture efficiency of the integrated cooker at low airflow and reduce energy consumption.It was found that the grease capture efficiency of the integrated cooker was improved by structural improvement at heavy load cooking(deep frying)with an exhaust air volume of 400 m~3/h.Among the improved structural models,the height of the smoke baffle was reduced by 0.03 m,the width of the top plate was increased to the right by 0.12 m,and the stove was moved to the left by 0.02 m.The capture efficiency reached 99.99%.On the basis of the improved model of the basic structure of the smoking area,the air curtain was added,and the influence of the radius and speed of the circular air curtain on the soot capture efficiency was analyzed.It was found that the air curtain helped to achieve the lower limit of the integrated stove exhaust volume reduction,and the capture efficiency of the integrated stove model with an air curtain radius of 0.01 m and an air curtain speed of 0.5 m/s was increased by 1.66 times on the original basis when the exhaust volume was 300 m~3/h.