Research Papers

Operation of a Spark Ignition Engine With High Compression Ratio Using Biogas Blended With Natural Gas, Propane, and Hydrogen

[+] Author and Article Information
Juan Pablo Gómez Montoya, Andrés A. Amell

Grupo de Ciencia y Tecnología del Gas y Uso
Racional de la Energía,
Facultad de Ingeniería,
Universidad de Antioquia,
Calle 67 N° 53 - 108,
Medellín 050010, Colombia

Daniel B. Olsen

Engines & Energy Conversion Laboratory,
Colorado State University,
Fort Collins, CO 80523
e-mail: andres.amell@udea.edu.co

Manuscript received February 13, 2017; final manuscript received October 16, 2018; published online December 4, 2018. Assoc. Editor: Ajay Agrawal.

J. Eng. Gas Turbines Power 141(5), 051006 (Dec 04, 2018) (10 pages) Paper No: GTP-17-1054; doi: 10.1115/1.4041755 History: Received February 13, 2017; Revised October 16, 2018

This research evaluated the operational conditions for a diesel engine with high compression ratio (CR) converted to spark ignition (SI), under stable combustion conditions close to the knocking threshold. The main fuel used in the engine was biogas, which was blended with natural gas, propane, and hydrogen. The engine limit to test the maximum output power was using the knocking threshold; just below the knocking threshold, the output power and generating efficiency are the highest for each blend. Leaner mixtures increased the engine knocking tendency because the required increase in the % throttle reduced the pressure drop at the inlet stroke and increased the mixture pressure at the end of the compression stroke, which finally reduced the ignition delay time of the end gas and increased the knocking tendency of the engine for all the blends. Therefore, the output power should be decreased to operate the engine below to the knocking threshold. Purified biogas achieved the highest output power and generating efficiency compared with the other blends and the original diesel operation; this blend was operated with five equivalence ratios. Purified biogas exhibits an optimal balance between knocking resistance, low heating value, flame speed, and energy density.

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Grahic Jump Location
Fig. 1

Experimental setup

Grahic Jump Location
Fig. 2

(a) Maximum output power and (b) generating efficiency, to two equivalence ratios

Grahic Jump Location
Fig. 3

(a) Specific fuel consumption and (b) combustion duration, to two equivalence ratios

Grahic Jump Location
Fig. 4

(a) IMEP and (b) COV IMEP, to two equivalence ratios

Grahic Jump Location
Fig. 5

(a) CO-specific emissions and (b) NOx-specific emissions, to two equivalence ratios

Grahic Jump Location
Fig. 6

(a) Generating efficiency and output power and (b) SFC and exhaust temperature, five equivalence ratios

Grahic Jump Location
Fig. 7

(a) Peak pressure and location and (b) NOx and CO emissions, to five equivalence ratios

Grahic Jump Location
Fig. 8

(a) Inlet pressure and (b) instantaneous pressure in the cylinder, to five equivalence ratios



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