Research And Development Of Efficient Three-ring Gas Stove

Natural gas with high calorific value and low pollutant emission index has gradually become the main source of domestic gas for residents in China.The continuous popularization of natural gas has also promoted the development of the gas stove industry.Gas stove enterprises have been vigorously promoting gas stoves with high thermal efficiency and low CO emissions in flue gas.Under the guidance of the "Two Mountains" concept,and in order to satisfy the people's longing for a better life,a leading domestic gas appliance company proposed the goal of developing an efficient gas stove with a thermal efficiency of more than 80%.This article collaborates with this company to research and develop an efficient gas stove.A three-ring gas stove was designed based on the heat transfer characteristics of the gas stove and the pot.The three-ring gas stove has the characteristics of a large heat exchange area between the combustion flame and the pot,a uniform temperature at the bottom of the pot,and high heat exchange efficiency.The design of the inner,middle and outer ejector tubes has achieved satisfactory ejection effect,effectively solving the problems of uneven fuel distribution and insufficient primary air supply.The unique design of the gas channel in the middle ring ensures that the inner ring has a sufficiently large secondary air channel area to make the fuel burn more fully.Through the preliminary evaluation of CFD numerical simulation,the effect of the value of the pot support height and the diameter of the inner circle of the energy gathering circle on the thermal efficiency of the gas stove was explored,and a reasonable exhaust temperature was obtained,thereby determining the three structural schemes of the three-ring gas stove.In this paper,the gas stove prototypes of the above three schemes were experimentally studied,and the effects of the energy gathering circle structure and the pot support height on the thermal efficiency and the CO emissions in the flue gas were studied.Finally,the highest thermal efficiency values of the three prototypes were 72.3%,75.6%,and 78.4%,respectively.The experimentally measured thermal efficiency results were compared with the simulated thermal efficiency results.The maximum error between the two is about 2.7%,which shows that the design optimization using CFD simulation works well.Finally,a corrugated plate was designed to destroy the thermal boundary layer formed when the flue gas and the pot exchange heat.The gas stove in the third scheme improved by the corrugated plate achieved a thermal efficiency of 80.5%.