Common questions

How do you reduce NOx emissions?

How do you reduce NOx emissions?

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).

What systems are used to control NOx emissions?

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 are NOx emissions regulated?

These emissions can be reduced by making process changes (such as modifications to the combustion process) or by installing air pollution control equipment (such as selective non-catalytic reduction (SNCR) or selective catalytic reduction (SCR)).

How is NOx removed from flue gases?

Due to the high temperature of flue gas the process is performed at a temperature between 50-55 degrees C. Flue gas containing CO2, O2, SO2 and NOx, is purged through Fe(II)EDTA2- containing liquid. The Fe(II)EDTA2- complex effectively binds the NOx; the bound NOx is converted into N2 in a complex reaction sequence.

What temperature is required for NOx emissions to form in the cylinder?

The rate of NOx formation generally increases significantly above 2,800°F flame temperature. Fuel NOx is formed by the reaction of nitrogen bound in the fuel with oxygen in the combustion air. It is rarely a problem with gaseous fuels.

What is NOx regulation?

MARPOL Annex VI limits the main air pollutants contained in ships exhaust gas, including sulphur oxides (SOx) and nitrous oxides (NOx), and prohibits deliberate emissions of ozone-depleting substances. …

What is NOx Technical Code?

The purpose of this Technical Code on Control of Emission of Nitrogen Oxides from Marine Diesel Engines, hereunder referred to as the Code, is to specify the requirements for the testing, survey and certification of marine diesel engines to ensure they comply with the nitrogen oxides ( NOX) emission limits of …

How do you remove NOx from air?

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.

How do low NOx burners work?

Low NOx burners are designed to control air and fuel mixing at each burner, which creates more branched and larger flames. By reducing the peak flame temperature, significantly less NOx is formed in the process. These hydrocarbons interact with the already formed NOx.

Which technology helps in reducing the NOx emission from the ships and there is no requirement of an auxiliary blower in the engine?

This exhaust gas after-treatment technology has a NOx abatement capability Of more than 80%. The SCR concept involves injecting a Urea-Water solution into the exhaust gas stream in combination with a special catalyst unit.

What does NOx stand for in gas furnace?

NOx is an abbreviation for nitrogen oxides – a collection of harmful and toxic greenhouse gases. These gases are released when fuel is burned at high heat like in an engine or home gas furnace.

How to control Sox and NOx in power plant?

How to control Sox and NOx emission in Power Plant 1 Switching the low sulphur fuel 2 Desulfurization the fuel 3 Utilizing a flue gas desulfurization ( FGD ) system 4 Combustion control techniques

Why do you need a heat pump with low NOx?

Why a heat pump is right for you. Zero emissions: The new Low Nox and Ultra-Low NOx standards are meant to make gas furnaces more environmentally friendly by reducing the amount of harmful greenhouse gasses they emit. This is great, but you know what’s better than low NOx emissions?

How are Nox and ultra low NOx determined?

These gases are released when fuel is burned at high heat like in an engine or home gas furnace. Low NOx and Ultra-Low NOx refers to emission limits on these products and are determined by local EPA standards and will vary for each type of heating equipment.

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