| In China, the Chinese gas cooking appliance (Chinese cooking appliance) is mainly used in hotels, restaurant and canteens and other places of cooking Chinese dishes. In using, the Chinese cooking appliances of commonly used find the following disadvantages:the thermal efficiency is low(only about20%), there is incomplete combustion, the high concentrations of pollutants(CO、NOx) in the flue, the noise of combustion, the noise and energy consumption of fan and so on. In order to improve the efficiency and safety of the Chinese cooking appliance and environmental protection, while using theoretical knowledge of heat transfer, combustion science and others to design a new type of Chinese cooking burner, And researching and analysising its various aspects in-depth.The heat load of Chinese food stove is usually high, Therefore,fully premixed combustion is chosen, the structural characteristics of the burner is:the inner flame of rated thermal load of lOkW and the outer flame of rated heat load of20kW, the inner flame is horizontal hole, the area of fire-hole is1815mm2, while the outer flame is tilted hole, the area of fire-hole is3852mm2, the height of inner flame and outer flame is18mm.The thermal performance characteristics of new blast completely pre-mixed lunch stove burner is studied by experiment, Comprehensive study of the flue gas, the contents variation of CO、NOx and O2and the size of heat load and thermal efficiency are got, and the results were analyzed to distinguish the performance of the blast completely pre-mixed lunch stove.First of all, according to the structural characteristics of the Chinese food stove burner, the flame stability burning interval of the inner flame and outer flame is determined by flame stability experiments. On the basis of the experimental operating point, within the flame joint work the flame and outer. Through the experimental the stable combustion heat load range of Chinese food stove is Q=25.81～32.47kW. In the rated gas pressure Pg=2000Pa, the actual heat load=29.04kW, which fully meet the requirements of the design and using. While its thermal efficiency up to34.48%, which is more49%than the efficiency of the cyclone China cooking stove burner in the market (the thermal efficiency is23.19%), and the content is only COα=328ppm, content is only NO(?)-1=112ppm, which is far below the emissions standards of the lunch stove pollutant. The fan is the main noise sources of the Chinese food stove, new blast completely pre-mixed lunch stove burner, through the rational layout of the duct, selecting the model ZYJD-100fan, the fan completely meet the requirements. Its noise level is only60.5dB, is fully meet the noise standards of lunch stove (<85dB), And the power consumption is only0.1OkW/h, greatly reduce power consumption (Normal cyclone China cooking stove power consumption is0.55kW/h).On the basis of the analysis in the Study on Thermal Performance of the new Chinese food stove, lunch stove ignition/flameout protection are chosen. In this study, the pulse ignition is chosen, this ignition set the ignition with the conductive flame protection as a whole, give full play to the ignition and flame failure protection features, and low prices is low. According to the characteristics of the new fully pre-mixed burner, ignition and flame failure protection, fan control linkage are designed, the feasibility of this approach is fully tested in the experiment.This topic is analysing about widespread problems of the market, commonly used in Chinese food stove, the use of theoretical knowledge, designing a new blast completely pre-mixed lunch stove burner, Experiments prove that this lunch stove burner is efficiency, energy saving, environmental protection, which is will have very important economic and practical value, about to lunch stove thermal efficiency, reduce harmful emissions, improve the working environment of the chef’s. |
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