Q. Why are NOx gases produced? High temperature combustion of fuels where the temperature is hot enough (above about 1300°C/ 2370°F) to oxidise some of the nitrogen in air to NOx gases. This includes burning hydrogen, as it burns at a very high temperature. Comments on diesel engines are shown below.
How do you reduce NOx in a diesel engine?
NOx emission can be reduced by primary methods such as retard injection, fuel nozzle modification, change of compression ratio, water direct injection, water emulsification, exhaust gas recirculation (EGR) and secondary method such as selective catalytic reduction (SCR).
How do you lower NOx levels?
Process modifications include using specially designed low-NOx burners, reburning, combustion staging, gas recirculation, reduced air preheat and firing rates, water or steam injection, and low excess air (LEA) firing. These modifications are capable of reducing NOx emissions by 50 to 80%.
What controls NOx on a diesel?
In diesel engines, water injection is used primarily to control NOx formation. In SI engines, water injection is an alternative to fuel enrichment at high load for controlling knock; it would also lower the exhaust temperature.
What does burning diesel release?
The primary products of petroleum fuel combustion in air are carbon dioxide, water, and nitrogen. … For instance, diesel engines produce one-twenty-eighth the carbon monoxide that gasoline engines do, as they burn their fuel in excess air even at full load.
Can you run nitrous on a diesel?
Diesel engines are the perfect platform for nitrous injection. Since most diesel engines run a rich fuel mixture (denoted by the signature black smoke they can emit from the tailpipe), nitrous oxide helps burn this excess diesel fuel in the combustion chamber, extracting additional horsepower.
Why is NOx so bad?
Nitric oxide (NOx)
NOx can cause serious health damage to humans, including respiratory diseases. NOx is also responsible for smog and the typical brown cloud that covers larger cities and produces poor air quality. … NOx reacts with volatile organic compounds in the presence of sunlight and forms ground-level ozone.
How do I remove NOx from my exhaust?
On an industrial scale, exhaust gases can be scrubbed with chemicals such as sodium hydroxide, hydrogen peroxide, or a mixture of hydrogen peroxide and nitric acid. These chemicals react with the NOx gases and removes them.
What method is used to remove NOx is removed from flue gases?
A method was proposed to remove NOx and SO2 in flue gas by using the sulfinyl functional group as a catalyst. Ozone is introduced into the flue gas to oxidize NO. Soluble NO2 and SO2 reacted with ammonia to form ammonium sulfate and ammonium nitrate, which were the raw material of the compound fertilizer.
What is the octane number of diesel?
Table 2.
| Fuel | Closed formula | Octane number |
|---|---|---|
| RON | ||
| Gasoline | C8H15 | 92–99 |
| Light diesel | C12.3H22.2 | — |
| Heavy diesel | C14.6H24.8 | — |