The dissertation is dedicated to researches of power, environment and technological characteristics of atmospheric burners of household gas stoves by combustion the natural, liquefied and mixed (with the hydrogen) fuels.
The researches have been carried out by meams of diagnostic facility – the original computerized firing rig as well as for the gas proving ground`s conditions. The limits of stable gas combustion with an atmospheric burners have been investigated, and also the origin the parameters of separate unstable operation modes have been defined: a flame flashback into the mixer, blowoff, lifting and separation of a flame and formation of «yellow tips», for household stove "Nord", while operation whit the natural and liquefied gases.
The thermodynamic analysis of the combustion process has been carried out, the actual problem of nitrogen dioxide formation in the combustion products flow [NO2] has been investigated. The temperature range of the reaction shift towards the formation of nitrogen dioxide for the NO – O2 – NO2 system has been determined.
The technological features of the «AB-HV» system operation are considered in the work under consideration. An influence of the distance h between the heated vessel and the burner is determined due to the appearance of water vapor condensate at the heat exchange surfaces. At values of distance h 10 mm the stagnant zones (UHZ) are arisen, which lead to an increase of the carbon oxide concentration [СО] 0,5 %. The presence of condensate at the heat transfer surface inhibits the heat transfer process and has a corrosive effect for the surface. The highest intensity of condensate formation was recorded for mixed fuels.
The possibility of ensuring the efficiency accordingly standards by fuel use was confirmed ( 59 %).
The extreme nature of the change in efficiency against the thermal load of the burner for the system «AB–HV» has been established, a monotonic decrease of the maximum and current efficiency with increasing h for the studied type of burner has ben recorded.
The concentrations of [CO], [NO], [NO2] emission have been experimentally determined undue course of operation the atmospheric ejection burners depending on the combustible gas flow rate, on the distance of the vessel HV from the atmospheric burner and on the primary air excess ratio (factor, coefficient) pr.
The experimental researches of atmospheric burners of household gas stoves "Greta" with the mixed fuel (methane-hydrogen mixture) by variation the share of methane within 5 50 % have been carried out for the first time. The energy efficiency and environmental characteristics of using the mixed fuel in the system «AB-HV» have been determined, as well as the technological features accompanying the heat transfer processes. Operation recommendations have been provided for the Regional Gas Company (RGC) with the purpose of using the hydrogen-containing gaseous fuels.
Key words: atmospheric burner, carbon oxide, combustion stability, energy efficiency, household gas appliances, hydrogen, liquefied gas, mixed fuel, natural gas, nitrogen oxides, primary air excess.
