ŞEYL GAZ YANMASININ KİRLETİCİLERİ ÜZERİNDE CO2, H2O VE N2 DİLÜSYONLARININ ETKİLERİ

Dünyada şeyl gazın keşfedilmiş büyük rezervleri ve enerji taleplerindeki artış, ülkelerin ve araştırmacıların artan bir şekilde şeyl gaz üzerine odaklanmasına sebep olmaktadır. Şeyl gazın üretim miktarı, son zamanlarda şeyl kayalarından gazın çıkartılması tekniklerinin geliştirilmesi ile artmaya başladı. Bu çalışmada, dilüsyon etkileri ile birlikte şeyl gaz ve nemli havanın ön karışımsız yanma karakteristikleri ve emisyonları, farklı ekivalans oranları, basınç ve sıcaklıklar altında sayısal olarak araştırılmıştır. Silindiriksel yakıcının iki boyutlu bir modeli düşünülmüştür. New Albany ve Haynesville için NOx’lerin, 1.025 ve 1.02 ekivalans oranında maksimum değere ulaştığı ve maksimum reaksiyon sıcaklıklarının sırasıyla 2027 ve 2014 K olduğu sonucuna varılmıştır. Artan ekivalans oranı CO kütle kesitlerini yükseltmektedir. Yükselen dilüsyon oranları NOx’i düşürmekte ve CO kütle kesitlerini artırmaktadır. Artan basınç NOx’i yükseltmekte ve CO kesitlerini azaltmaktadır. Yükselen duvar sıcaklığı NOx, CO ve reaksiyon sıcaklıklarını artırmaktadır. Şeyl gaz yanmasının sonunda ortaya çıkan çevresel kirleticilerden NOx ve CO, ekivalans oranı, duvar sıcaklığı ve basıncı düşürerek azaltılabilir. CO2 ve N2 ile karşılaştırıldığında, NOx ve CO kirleticileri üzerindeki zıt etkilerinden dolayı H2O dilüsyonunun kullanımı bir adım öne çıkmaktadır.

Anahtar Kelimeler:

Şeyl gazı, Ön karışımsız yanma, Türbülans, Nitrojen oksitler

THE EFFECTS OF CO2, H2O, AND N2 DILUTIONS ON POLLUTANTS OF SHALE GAS COMBUSTION

Increase in demands for energy and discovered huge reserves of shale gas in the world cause countries and researchers to focus on it progressively. The amount of shale gas production has begun to rise by developing the techniques of gas extraction from shale rocks recently. In this paper, the non-premixed combustion characteristic and emissions of shale gas and humid air with dilution effects are numerically investigated under different equivalence ratio, pressure and temperature. A two dimension model of cylindrical combustor is considered. It is concluded that NOx for New Albany and Haynesville come to the maximum value at 1.025 and 1.02 of equivalence ratio and the maximum reaction temperatures are 2027 and 2014 K in turn. The rising equivalence ratio raises CO mass fractions. The increasing dilution rates decrease NOx and uplift CO mass fractions. The enhancing pressure rears NOx and diminishes CO fractions. The ascending wall temperature boosts NOx, CO and reaction temperatures. NOx and CO from environmental pollutants emerging at the end of shale gas combustion can be lowered by decreasing equivalence ratio, wall temperature, and pressure. The use of H2O dilution steps forward in compared with CO2 and N2 because of its opposite effects on NOx and CO pollutants.

Keywords:

Shale gas, Non-premixed combustion, Turbulent, Nitrogen oxides,

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