What is SOx and NOx?
Sulphur oxides (SOx ) and nitrogen oxides (NOx ) emissions.
Why is NOx harmful?
Environmental and health effects of nitrogen oxides
Elevated levels of nitrogen dioxide can cause damage to the human respiratory tract and increase a person’s vulnerability to, and the severity of, respiratory infections and asthma. Long-term exposure to high levels of nitrogen dioxide can cause chronic lung disease.
What causes high NOx in diesel engines?
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.
What is thermal NOx?
Thermal NOx refers to the NOx formed through high temperature oxidation of the nitrogen found in the combustion air. The formation rate is a function of temperature as well as residence time at temperature.
What is the full form of NOx?
The term ‘nitrogen oxides’ (NOx) is usually used to include two gases-nitric oxide (NO), which is a colourless, odourless gas and nitrogen dioxide (NO2), which is a reddish-brown gas with a pungent odour. Nitric oxide reacts with oxygene or ozone in the air to form nitrogen dioxide.
What are the sources of NOx?
NOx pollution is emitted by automobiles, trucks and various non-road vehicles (e.g., construction equipment, boats, etc.) as well as industrial sources such as power plants, industrial boilers, cement kilns, and turbines. NOx often appears as a brownish gas.
What does NOx stand for?
Nitric oxide (NOx)
Nitrogen oxides (NOx) are a common term for the nitrogen oxides N2O, NO, N2O3, NO2 and NO3 and are a chemical compound of oxygen and nitrogen that is formed during the combustion of fuel and organic material at high temperatures.
What causes NOx?
NOx pollution is emitted by automobiles, trucks and various non-road vehicles (e.g., construction equipment, boats, etc.) as well as industrial sources such as power plants, industrial boilers, cement kilns, and turbines.
How do you fix high NOx?
The best way to minimize NOx formation is to reduce flame temperature, reduce excess oxygen, and/or to burn low nitrogen-containing fuels. The following represents proven, available NOx-reduction strategies and technologies for combustion sources.
How do you reduce NOx?
One way of controlling NOx emissions is to use low-nitrogen fuels. Another is to modify combustion conditions to generate less NOx. Flue gas treatment techniques, such as selective cata- lytic reduction (SCR) processes, can remove NOx.
What is NOx stand for?
What causes high NOx in a heater?
The most significant factors are flame temperature the amount of nitrogen in the fuel, excess air level and combustion air temperature. Also, a longer residence time at high temperatures results in higher NOx.
What is NOx and why do we need to use it?
NOx often appears as a brownish gas. It is a strong oxidizing agent and plays a major role in the atmospheric reactions with volatile organic compounds (VOC) that produce ozone (smog) on hot summer days.
How do you control NOx?
How can NOx be reduced?
Reduction of NOx is possible by using Selective Catalytic Reduction (SCR) technology. A SCR system uses an aqueous urea solution known as AdBlue® which, when injected in a specific way into a SCR catalytic converter, is converted into Ammonia.
How do I lower my 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%.