Study On Performance Testing And Numerical Simulation Optimization Of Gas Stove In Lhasa Area

With the improvement of the gas pipeline network construction in Lhasa, more and more local residents will use natural gas stove. But Lhasa is located in the central of Tibet Plateau, Where the altitude is 3650 m and the average atmospheric pressure is only 65.23 k Pa. With thin air, low oxygen in the air, the special geographical and climatic conditions would have a negative impact on the use of gas appliances.As gas stoves on current market mostly be designed in accordance with normal gas pressure of 2000 Pa in plain areas. Test results of gas stove in accordance with normal gas pressure of 2000 Pa in Lhasa area show that the heat load is significantly lower, and even unable to meet the daily requirements of local residents. To solve the impacts of altitude on the gas stove heat load, gas appliance manufacturers tend to adopt the way of changing the diameter of the nozzle to adjust the heat load, this approach will not only significantly increase the production cost of manufacturers, but may also affect the combustion conditions of the gas stove, resulting in a lack of air volume and high CO content in the flue gas.On the effects of altitude on gas appliances heat load, some scholars have suggested to eliminate this influence by increasing upstream gas pressure of gas stove. According to the CJJ 12-2013 "Regulation of domestic gas burning appliances installation and acceptance", upstream gas pressure of gas stove in Lhasa area is appropriate for 2800 Pa.So in this paper, a gas stove designed for the nominal pressure in plain areas has been tested to analysis the possibility that without any structural change, just by elevated gas pressure conditions, the test stove direct used in Lhasa area.The test results show that when the gas stove designed for the plain areas been tested in Lhasa, by increasing the upstream gas pressure to 2800 Pa, the measured thermal load is larger than 3.5k W, and can basically meet the requirements of local residents’ normal use. High altitude environment conducive to the improvement of the thermal efficiency of the stove, but its hypoxia environment will lead to the generation of CO in the flue gas. It’s maybe the main means by increasing the excess air ratio to solve the high volume fraction of CO in flue gas in Lhasa. For this reason, numerical simulation of combustion under different pot support height has been performed in the last part of this paper, and the relationship between pot support heights and the heat load and volume fraction of CO in flue gas have been analyzed. According to the analysis result, pot support height range that able to meet the CO content of the flue gas is not excessive and with a higher thermal efficiency has been given at the same time.