Abstract
So far, most of the experimental researchers studying the removal of diesel exhaust pollutants have done so with simulated exhaust gas, which cannot demonstrate the ability of catalysts accurately. Because activated carbon (AC) has low price, no secondary pollution, good adsorption performance, and certain catalytic activity, it has good application prospects in the field of marine exhaust pollutant removal. In this paper, the removal of particulate matter (PM), carbon monoxide (CO), and NOx from real exhaust gas by AC was studied. The results show that PM removal efficiency reached up to 77%, while the pressure drop increased with running time. AC may degenerate to some extent with the increase of temperature, resulting in a negative removal efficiency of CO. The denitration efficiency of AC was up to 34.5% without urea, and further increased to 44.8% after spraying urea, still a distance from industrial applications. In the future, it may be necessary to install a fan to compensate the reactor or to backwash the reactor to avoid excessive pressure drop. The thermal stability of the AC also needs to be improved. To increase the denitration performance, it may be helpful to modify the AC or impregnate other metal oxides.
Highlights
Diesel engines are widely used on ships as the main power and power generation unit
In addition to CO2 causing the greenhouse effect, ship exhaust gas contains a large amount of pollutants such as sulfur oxides (SOx ), nitrogen oxides (NOx ), particulate matter (PM), and carbon monoxide (CO). [1,2] The International Maritime Organization (IMO) issued Convention of MARPOL 73/78
This paper mainly discusses the removal of CO, PM, and NOx by activated carbon
Summary
Diesel engines are widely used on ships as the main power and power generation unit. In addition to CO2 causing the greenhouse effect, ship exhaust gas contains a large amount of pollutants such as sulfur oxides (SOx ), nitrogen oxides (NOx ), particulate matter (PM), and carbon monoxide (CO). [1,2] The International Maritime Organization (IMO) issued Convention of MARPOL 73/78. In addition to CO2 causing the greenhouse effect, ship exhaust gas contains a large amount of pollutants such as sulfur oxides (SOx ), nitrogen oxides (NOx ), particulate matter (PM), and carbon monoxide (CO). Marine diesel engines generally use heavy fuel oil with a 3.5% sulfur content. This usually results in a high concentration of PM in the exhaust gas, and causes sulfur poisoning of the selective catalytic reduction (SCR) catalyst. Vanadium-based catalysts have a good thermal stability and sulfur tolerance and high denitration efficiency in a wide temperature range, and are more often used commercially. Low-sulfur fuel oil and activated carbon denitration together can be a possible path to control the emission of multiple exhaust pollutants from marine diesel engines. The feasibility of activated carbon in the removal of various exhaust pollutants from marine diesel engines and references for future applications are discussed
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