Research On Theory And Application Of Energy-aggregating Ring For Domestic Gas Cooking Appliances

As a daily cooking utensil for residents,the number of domestic gas cooking appliances is very large.The increase of thermal efficiency by one percentage point can reduce a lot of energy consumption.Therefore,it is significant to study energy-efficient of domestic gas cooking appliances.Currently,atmospheric combustion is widely used in the domestic gas cooking appliances,fuel combustion in the open outside air space,the temperature of the flame is reduced by an excess entrainment of secondary air,causing the flame to the bottom of the convection and radiation heat transfer is decreased.This is an important reason for the low thermal efficiency of gas cooking appliances at present.Some scholars have made research on adding an energy-aggregating ring structure to form a semi closed combustion space between the gas burner and the bottom of the pot to control the secondary air entrainment and reduce the high temperature flame radiation heat loss to the environment.However,the study is limited to the effect of the energy-aggregating ring on the thermal efficiency of the specific cooker,does not study the control effect of the energy-aggregating ring on the secondary air,and it is not universally applicable.This paper is based on theoretical analysis,experiment and combustion numerical simulation,the optimal design of the energy-aggregating ring parameters is studied in this paper.The purpose is to provide a more reasonable design method for how to match different types of cooker burners to maximize its energy saving advantages.The experimental results show that when test stove actural heat input is 4.00-4.48 kW,the energy-aggregating ring makes the cooker thermal efficiency increase by 2.06-3.17%,the increase range is 3.50~5.50%,and the energy saving effect is obvious.The optimal range of value of the distance between the top of the energy-aggregating ring and the bottom of the pan is 10.4mm-12.0mm.therefore,it determines the height of the inner surface of the energy-aggregating ring as 20.0-21.6mm.the thermal efficiency is increased by 0.92-1.21% with the temperature of the inner surface of the energy-aggregating ring increased by 50 degrees centigrade.Therefore,the necessary insulation protection measures on the outer surface of the energy-aggregating ring can promote the improvement of the thermal efficiency of the stove.The empirical correlation formula of the secondary air inlet width at the bottom of the energy-aggregating ring is obtained through the CFD simulation and thermal efficiency calculation model of stove.which provides a reference for the design of the bottom diameter of the energy-aggregating ring.According to the parameters of the domestic gas cooking appliances,the diameter of the bottom of the energy-aggregating ring can be designed,which can control the flue gas secondary air entrainment to a certain extent.The design proposal of energy-aggregating ring.First,determine the distance between the top of the energy-aggregating ring and the distance from the bottom of the pot,then,calculate the design height of the inner surface of energy-aggregating ring and the secondary air inlet width at the bottom of the energy-aggregating ring.Thus,the bottom diameter of the energy-aggregating ring can be obtained.the diameter of the top diameter of the energy-aggregating ring can be determined.to be the diameter of the lower limit pot for the rated heat efficiency national standard of the matching cooker.The design proposal of energy-aggregating ring can be used in the design of different heat input and burner type.It can provide reference for the design of the energy-aggregating ring.