TITLE : - EFFECT OF HYDROGEN BLENDING ON CNG-FUELED VEHICLES SOURABH JOGEE (214ME5327)

M.TECH,CRYOGENICS AND VACUUM TECHNOLOGY

Abstract

The combustion of CNG produces less emission, due to its simple structure and absence of fuel evaporation hence it is a viable alternative for fossil fuel . Addition of small amount of hydrogen can improve the combustion characteristics and reduces exhaust emissions . Experimentation was performed in the speed range of 2500-4000 rpm with variation in load. The process involves to regulate the pressure in the input line to vary the amount per unit time to be inducted into the engine. It is done by taking the blends of 5%, 10%, 15% of H2 with CNG by energy and various operating parameters were taken.

Objectives

1) To check suitability of S.I. engine for HCNG on gasoline engine.

2) To enhance the combustion of CNG by adding hydrogen.

3) To study effects of HCNG blends over CNG.

4) To obtain maximum thermal efficiency with lean fuel mixture.

5) To reduce exhaust emissions below standard norms.

Methods Results Conclusion

1.EQUIVALENCE RATIO In case CNG(=0.65 to 1.19) 5% HCNG(=0.66 to 1.34) 10%HCNG(= 0.62 to 1.28) 15%HCNG(= 0.69to 1.39) 2. BRAKE THERMAL EFFICIENCY

3. BRAKE SPECIFIC FUEL CONSUMPTION:-

4. CARBON MONOXIDE EMISSIONS:-

5. NITROGEN OXIDES EMISSIONS:-

EXPERIMENTATION METHOD FOR HCNG:- Blending on Energy basis Mixing at constant pressure Regulation of lpm for corresponding blending

Varying pressure(200-280 kPa) Varying speed (2500-4000 rpm) WOT

Modifications:- 1) Mixer 2) Flametrap

1. The neat CNG has wide flammability limits. The flammability limits increase as the percentage of hydrogen in CNG is increased.

2. The results show the engine running on CNG on equivalence ratio from 0.65 to 1.19 and HCNG on equivalence ratio from 0.62 to 1.28 an attempt was made to run the engine at the lowest possible equivalence ratio.

3. It observed that maximum value of BTHE for CNG is 19.5% and for 5% blend of H2 with CNG is 20.5% at an equivalence ratio of 0.91 and speed of 2500rpm.It results into an increase of 5.128%.

4. The BSEC and BSFC was found minimum at an equivalence ratio of 0.9 and had higher values at lean and rich mixtures.

5. The CO emissions are less at lean mixture and increases sharply at rich mixtures.

6. NOx increase with higher temperature, longer high temperature combustion duration and greater availability of oxygen (up to a point).

Schematic Diagram of Setup:-