Emissions reduction potential by coupling a thermoelectric generator to an exhaust heater in heavy duty vehicles
First part of this research is focused in validating the Exhaust Gas Heater (EGH) viability in reducing NOx emissions without negative effects in a standard exhaust gas circuit. Experimentation was held using a HDV Euro VI vehicle in a certified rolling bench. Results are encouraging but the system...
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| Tipo de recurso: | tesis doctoral |
| Estado: | Versión publicada |
| Fecha de publicación: | 2022 |
| País: | España |
| Institución: | CBUC, CESCA |
| Repositorio: | TDR. Tesis Doctorales en Red |
| OAI Identifier: | oai:www.tdx.cat:10803/687367 |
| Acceso en línea: | http://hdl.handle.net/10803/687367 |
| Access Level: | acceso abierto |
| Palabra clave: | Sistemes de reducció catalítica selectiva Sistemas de reducción catalítica selectiva Selective catalytic reduction systems Eficiència SCR Eficiencia SCR SCR efficiency Reducció NOx Reducción NOx NOx reduction Generador termoelèctric automotriu Generador termoeléctrico automotriz Automotive thermoelectric generator ATEG Generador termoelèctric Generador termoeléctrico Thermoelectric generator Vehicles pesats Vehículos pesados Heavy duty vehicles Escalfador de fums d'escapament Calentador de humos de escape Exhaust gas heater EGH Escalfador de posttractament termoelèctric Calentador de postratamiento termoeléctrico Thermoelectric aftertreatment heater TATH 621 625 |
| Sumario: | First part of this research is focused in validating the Exhaust Gas Heater (EGH) viability in reducing NOx emissions without negative effects in a standard exhaust gas circuit. Experimentation was held using a HDV Euro VI vehicle in a certified rolling bench. Results are encouraging but the system has to be properly adapted and optimized. We are seeking a balance between NOx abatement and thermal wasted energy harvested for increasing exhaust gas temperature. Second part of this study explores the Automotive Thermoelectric Generator (ATEG) viability as the only source of energy to power the EGH. It quantifies the electrical energy produced in three common engine regimes (1000, 1250 and 1500 rpm). It measures production variations affected by different Full Throttle Pedal Positions (FTPP) all along the exposed regimes. This study presents a Thermoelectric Aftertreatment Heater (TATH) as a solution coupled to the vehicle standard configuration. It also determines the ideal location of both EGH and ATEG to optimize its performance and keep the standard ATS with minimal variations. The use of this system is divided into two different phases, heating stage and recovery stage. Heating stage is when EGH consumes electricity to rise exhaust gas temperature. On the other hand, recovery stage is applied when exhaust gas temperatures are high enough to allow ATEG recover wasted energy. Parameters such as backpressure and added weight has been taken into account in order to provide a fair energy balance to the comparison. In this regard, extra fuel consumption of the HDV has been quantified. Third part of our research explores the different HDV routines and its particularities in order to determine in which ones the TATH can provide a major NOx improvement. The effects of this system are explored in a real transportation routine of a long-haul journey. The presented system is reducing polluting emissions in low engine regime circumstances, mainly in urban areas that are populated. Recovery stage of the system is quantified within this specific routine. Afterwards, the amount of energy required for heating stage is quantified concerning routine requirements. Finally, experimental results demonstrate that a certified EURO VI HDV can produce NOx emissions 5 times above the standard limit value under specific circumstances (low-speed regimes). The accomplishment of current EURO VI and prospective EURO VII has been analyzed taking into account the benefits of this proposed TATH compared to the standard homologated ATS of this particular vehicle. Results demonstrate a NOx reduction up to 97.2% using the system proposed into this particular mission profile. Apart from that, it is also demonstrated that the ATEG can produce the energy required by the EGH in a long-haul mission profile. However, the added weight and the back pressure caused by the TATH is expected to increase the fuel consumption of the vehicle in 0.35% |
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