A modified diesel engine for natural gas operation: Performance and emission tests |
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| Authors: | Chedthawut Poompipatpong Kraipat Cheenkachorn |
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| Affiliation: | aDepartment of Automotive Engineering Technology, College of Industrial Technology, King Mongkut’s University of Technology North Bangkok, 1518 Pibulsongkram Rd., Bangsue, Bangkok 10800, Thailand;bDepartment of Chemical Engineering, Faculty of Engineering, King Mongkut’s University of Technology North Bangkok, 1518 Pibulsongkram Rd., Bangsue, Bangkok 10800, Thailand;cAutomotive Eco-Energy Research Center, King Mongkut’s University of Technology North Bangkok, 1518 Pibulsongkram Rd., Bangsue, Bangkok 10800, Thailand |
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| Abstract: | A diesel engine was modified for natural gas operation to optimize performance using gaseous fuel. A variation of combustion ratios (CR) including 9.0:1, 9.5:1, 10.0:1 and 10.5:1 was utilized to evaluate engine performance and emissions from the same engine over the engine speeds between 1000 and 4000 rpm. Tested engine performance parameters include brake torque, brake power, specific fuel consumption (SFC) and brake thermal efficiency. Emissions tests recorded total hydrocarbon (THC), nitrogen oxides (NOx) and carbon monoxide (CO). The results showed that a CR of 9.5:1 had the highest thermal efficiency and the lowest SFC while a CR of 10:1 showed a high torque at low speed. THC emissions were directly proportional to the CR. NOx emissions increased with increasing CR and then declined after a CR of 10:1. |
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| Keywords: | Modified diesel engine Natural gas Compression ratio Emission |
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