REDUCING THE FORMATION OF NITROGEN OXIDES DURING THE COMBUSTION OF NATURAL GAS
The purpose of researches, the results of which are given in the article was to determine the dominant components of ballasting gases that affect the formation of NOx during combustion of natural gas, as well as methods their feed into the combustion chamber. It is defined that most influence for formation NOx in exhaust gases derive in case is ballast gas with gaseous fuels on molecular level pre-mixed, but not with blast air. It was shown experimentally that premixing the ballast gas (CO2 or N2) with the natural gas provides reducing the formation of nitrogen oxides during combustion of the mixture. Thus, by mixing natural gas with 10 % ballasting gas ([Vб/(Vг – Vб)].100, a = 1) NOx reduction achieved in the case of using N2 52 %, CO2 — 95 %. Mixing exhaust gases (combustion products) at the recirculation ratio r = 10 with natural gas in the burner reduces the yield of nitrogen oxides by 44 %, and in case their pre-mixing with blast air on the 24 %. CO2 mixing with blast air (r = 10) reduces the yield of nitrogen oxides by 34 %. Developed and tested burners for boilers with capacity of 110 t/h of steam with added exhaust gases to natural gas in the burner. Bibl.18, Fig.12, Tab.1.
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