Solution for reduction in NOx emissions from internal combustion engines
- Country : Vietnam
- Subject : Transport
Keywords : formation mechanism, emission, nitrous oxides, solution
Abstract
Today sustainable development is always concerned about every country in the world, especially the protection of the human environment. The human environment is severely damaged by various sources and one of the major sources of pollution is internal combustion engine emissions - which provide up to 80% of the world's energy consumption. Internal combustion engines are a type of heat engine, because the combustion of fuel, the process of switching from the heat of the gas to the engine is carried out right in the engine charcoal. The reciprocating internal combustion engine has high thermal efficiency because the maximum temperature in the combustion process can be up to 1800K-2800K, while the exhaust gas temperature is about 900-1500K. Especially turbocharged turbochargers are the most efficient in all types of engine engines today. The detailed consideration of the negative impact of internal combustion engines is of paramount importance and the aspects to be considered are: Evaporation pollution of fuel. Pollution due to exhaust gases, pollution by chatting and fuel additives, reduced visibility due to smoke and unpleasant odors of diesel exhaust. As we know, in the world today there are approximately 1 billion cars, annually emitting millions of tons of toxic environment. Particularly in Vietnam, along with the socio-economic development, speed increases. Every year the above mentioned means is quite high. For example, the average motorcycle growth rate of 2015 is 12.48%. At 31.12.2016, the country had 460.000 cars and 5.585.000 motorbikes. At present, the majority of motorbikes are concentrated in big urban areas such as Hanoi and Ho Chi Minh City, causing extreme environmental pollution. Therefore, research to limit engine pollution emissions is an urgent requirement for any country. NOx emissions arise through the burning of fuels at high temperatures, through chemical processes that use nitrogen. In nature, from the nitrogen oxidation of the air due to lightning, volcanic gas and microbial decomposition processes. Nitrous oxides normally exist in the air at very small concentrations and do not cause pollution concerns. However, along with the development of transportation, vehicles that emit NOx emissions beyond the permitted levels are seriously affecting the air quality. This article presents some solutions to absorb or convert NOx in waste gases to reduce environmental pollution.
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