According to foreign media, Tohoku University in Japan
University) has found a new plan to reduce the emission of nitric oxide during the combustion of ammonia fuel. The plan of this process is to make the gas mixed with air into a vortex as an important part of the power generation process. The study will help promote ammonia research and development as an alternative fuel for carbon based fuels in automobiles, aircraft and power generation facilities.
Ammonia (NH3) is a compound containing one nitrogen atom and three hydrogen atoms. According to the current research and investigation, there are many reasons why ammonia is used as an alternative fuel. Compared with pure hydrogen, it contains hydrogen atoms, and its price is relatively cheap and non flammable. It is used for transportation and travel with high safety. At present, production facilities have been built and are ready-made, because ammonia is widely used in fertilizer.
At present, the assimilation of ammonia with gasoline, diesel, hydrogen and methane can be regarded as a new fuel, aiming at reducing the proportion and emission of carbon based fuel and improving the atmospheric environment. There are still technical challenges in using ammonia as a pure fuel source, which is due to the large amount of nitric oxide (no) produced during combustion
Oxide, no), which will cause pollution to the environment
In addition, nitric oxide will also cause harm to human health and destroy the ozone layer in the atmosphere. When reacting with other compounds, it will lead to acid rain or atmospheric warming
The research team of the Institute of fluid science of Northeastern University of Japan used supercomputers to run large eddy simulations, aiming to analyze the chemical performance of ammonia fuel in different combustion environments, so as to determine the feasibility of low NO emission on its appearance
The team analyzed the chemical changes of the combustion chamber in the appearance of the swirl state of ammonia and air under different pressure environment, compared the experimental results with the values of ammonia and air pre assimilates before entering the combustion chamber, and confirmed that under the condition of high fuel air ratio, the emission of nitrogen monoxide was low
The team found that after two streams of ammonia and one stream of air were assimilated, their no emissions after combustion matched the values before assimilation. Innermost and outermost
The volume of the two streams of ammonia between swirlers is not uniform, accounting for 40% and 60% of the injected fuel volume respectively, which leads to a more uniform ratio of fuel and air in the combustion chamber, thus lowering the emission of No
However, the emission value is still higher than the emission limit of Japan's environmental protection laws and regulations for gas turbines. The researchers plan to hold a new study to reduce the air proportion in the combustion chamber and further lower the emission.
——Author：ebico