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Study of NOx Emissions of S.I. Engine Fueled with Different Kinds of Hydrocarbon Fuels and Hydrogen
دراسة ملوثات NOx لمحرك اشتعال بالشرارة يعمل بأنواع مختلفة من الوقودالهيدروكاربوني والهيدروجين

Authors: Qahtan A. Abass قحطان عدنان عباس --- Miqdam T. Chaichan مقدام طارق جيجان
Journal: Al-Khwarizmi Engineering Journal مجلة الخوارزمي الهندسية ISSN: 18181171 23120789 Year: 2010 Volume: 6 Issue: 2 Pages: 11-20
Publisher: Baghdad University جامعة بغداد

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Abstract

Liquefied petroleum gas (LPG), Natural gas (NG) and hydrogen were used to operate spark ignition internal combustion engine Ricardo E6, to compare NOx emissions emitted from the engine, with that emitted from engine fueled with gasoline as a fuel.
The study was done when engine operated at HUCR for gasoline, compared with its operation at HUCR for each fuel. Compression ratio, equivalence ratio and spark timing were studied at constant speed 25rps.
The results appeared that NOx concentrations will be at maximum value in the lean side near the stoichiometric ratio, and reduced with moving away from this ratio for mixture at both sides, these concentrations were at its highest value when hydrogen used at CR=8:1, and got near to each other for the three hydrocarbon fuels used in the study, when the engine operated at HUCR for each fuel, but still hydrogen had maximum value, the main variable affect these concentrations was spark timing

استخدم الغاز النفطي المسال والغاز الطبيعي والهيدروجين لتشغيل محرك احتراق داخلي يعمل بالشرارة نوع Ricardo E6، ومقارنة ملوثات NOx المنبعثة من المحرك مع مثيلاتها عند عمل المحرك بالجازولين.تمت دراسة الملوثات الناتجة عند عمل المحرك بنسبة الانضغاط النافعة العليا للجازولين 8:1، ومقارنتها بعمله بنسبة الانضغاط النافعة العليا لكل وقود على حدة، ودرس تأثير نسبة الانضغاط والنسبة المكافئة وتوقيت الشرر، عند عمل المحرك بسرعة ثابتة 1500 rpm.أظهرت النتائج أن أعلى قيمة لملوثات NOx تكون دائما في الجانب الضعيف، وتقل التراكيز بالابتعاد عن تلك النسبة لجانبي الخليط، وأن هذة الملوثات تكون أعلى ما يمكن للغاز الهيدروجين عند نسبة انضغاط 8:1، وتتقارب لأنواع الثلاثة للوقود عند عمل المحرك بنسبة انضغاط نافعة عليا لكل وقود، ولكن يبقى الهيدروجين ذو أعلى قيم لتراكيز NOx، كما أن أكبر تأثير على هذة الملوثات كان لتوقيت الشرر.


Article
Comparison of Performance Characteristics of LPG and Gasoline - Fuelled Single Cylinder SI Engine

Author: Saad Abdul Qadir Abdul Azeez
Journal: Tikrit Journal of Engineering Sciences مجلة تكريت للعلوم الهندسية ISSN: 1813162X 23127589 Year: 2016 Volume: 23 Issue: 1 Pages: 96-104
Publisher: Tikrit University جامعة تكريت

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Abstract

The investigations have been concentrated on decreasing fuel consumption by using alternative fuels and on lowering the concentration of toxic components in combustion products. LPG as an alternative to gasoline has emerged as a solution to the deteriorating urban air quality problem, especially in an oil country like Iraq. LPG has already been used as cooking fuel in Iraq. In the present paper practical tests of various operating parameters and concerns have been prepared for better understanding of operating conditions and constrains for a LPG fueled internal combustion engine.The results show that HUCR for gasoline was 8:1, and for LPG was 10:1. bsfc reduced by using LPG at its HUCR, while at CR=8:1 it became higher than that for gasoline. Volumetric efficiency reduced by using LPG due to its gaseous nature, but it was improved when the engine was run at HUCR. Brake thermal efficiency depends on bsfc and bp, so LPG preceded gasoline at medium speeds and torques. Exhaust gas temperatures reduced by using LPG, the minimum values were when the engine operated at CR= 8:1. The maximum values were for gasoline share.

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