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What is NOx and SOx?

Are NOx and SOx greenhouse gases?

Greenhouse gases (GHGs), carbon monoxide (CO), nitrogen oxides (NOx), sulphur oxides (SOx), and particulate matter (PM, especially PM10—Particles with 10 microns and below—And PM2. 5—Particles with 2.5 microns and below) are frequently considered the main pollutants from the combustion of ship engines.Oct 6, 2020

What are SOx gases?

Sulfur dioxide (SO2), a colorless, bad-smelling, toxic gas, is part of a larger group of chemicals referred to as sulfur oxides (SOx). These gases, especially SO2, are emitted by the burning of fossil fuels — coal, oil, and diesel — or other materials that contain sulfur.

How can we prevent NOx and SOx?

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 is NOx and SO2?

Breathing either sulfur dioxide (SO2) or nitrogen oxides (NOx) for short periods (24 hrs or less) can cause adverse respiratory effects such as airway inflammation, bronchoconstriction, asthma symptoms, emergency department visits and hospital admissions, especially for those with asthma or respiratory illnesses [2].May 7, 2015

image-What is NOx and SOx?
image-What is NOx and SOx?
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Where does SOx and NOx come from?

SOx and NOx emissions originate as products of combustion that accompany power generation and the processing of pulping chemicals. Electric utilities are by far the dominant sector for SOx and NOx emissions.

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What is SOx emission?

Sulfur oxide (SOx) emissions are mainly due to the presence of sulfur compound in the fuel. Smoke containing sulfur oxides emitted by the combustion of marine fuel will often oxidize further, forming sulfuric acid which is a major contributor to acid rain.Nov 29, 2017

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Why is NOx so bad?

Nitric oxide (NOx)

NOx can lead to serious damage to human health, including respiratory diseases. NOx is also responsible for smog and the typical brown cloud that covers larger cities and provides poor air quality. ... NOx reacts with volatile organic compounds in the presence of sunlight and forms ground-level ozone.

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What is SOx compliant?

The Basics of SOX Compliance

While the details of the Sarbanes-Oxley Act are complex, “SOX compliance” refers to the annual audit in which a public company is obligated to provide proof of accurate, data-secured financial reporting.
May 28, 2019

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What is NOx chemical?

Nitrogen Oxides are a family of poisonous, highly reactive gases. ... These gases form when fuel is burned at high temperatures. NOx pollution is emitted by automobiles, trucks and various non-road vehicles (e.g., construction equipment, boats, etc.)Oct 11, 2019

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What does NOx do to humans?

NOx has direct and indirect effects on human health. It can cause breathing problems, headaches, chronically reduced lung function, eye irritation, loss of appetite and corroded teeth. Indirectly, it can affect humans by damaging the ecosystems they rely on in water and on land—harming animals and plants.Sep 23, 2015

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How SOx is produced on board the ship?

The sulphur oxides emission is due to the presence of sulphur compound in the marine fuels used in marine engines on board vessel. ... Maritime industry consumes mostly low grade of fuel oil i.e. heavy oil and diesel oil with high sulphur content as compared to any other transportation medium.Oct 18, 2021

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How is SOx produced?

SOx or sulphur oxides are formed during combustion process in the engine because of presence of sulphur content in the fuel.Sep 1, 2021

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How do I reduce SOx in my boiler?

Methods of SOx reduction include switching to low sulfur fuel, desulfurizing the fuel, and utilizing a flue gas desulfurization (FGD) system. Fuel desulfurization, which primarily applies to coal, involves removing sulfur from the fuel prior to burning.

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What causes high NOx emissions?

  • High NOx emissions can occur when an engine's air-fuel mixture is too lean. This can happen when too much air is added to the fuel or when too little fuel is injected into the engine. In either case, this causes the mixture to burn hotter.

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What is sulphur oxides or SOx air pollution from ships?

  • Sulphur oxides (SOx) are known to be harmful to human health, causing respiratory symptoms and lung disease. In the atmosphere, SOx can lead to acid rain, which can harm crops, forests and aquatic species, and contributes to the acidification of the oceans. Limiting SOx emissions from ships will improve air quality and protects the environment.

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How is NOx formed?

  • Thermal NOx is formed when nitrogen and oxygen in the combustion air combine with one another at the high temperatures in a flame. Thermal NOx makes up the majority of NOx formed during the combustion of gases and light oils. The rate of NOx formation generally increases significantly above 2,800°F flame temperature.

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