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首页> 外文期刊>Ocean Engineering >Effects of potassium sulfide content in marine diesel fuel oil on emission characteristics of marine furnaces under varying humidity of inlet air
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Effects of potassium sulfide content in marine diesel fuel oil on emission characteristics of marine furnaces under varying humidity of inlet air

机译：进气湿度变化下船用柴油中硫化钾含量对船用炉排放特性的影响。

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摘要

Degraded fuel oils are generally used in marine power plants for economic purposes, so as to reduce operating expenses. These marine fuel oils commonly contain various oxides or sulfide compounds of metallic elements in the fuel ash, and affect the combustion and emission characteristics of marine power plants to different extents. Moreover, marine power plants are more often operated in a highly humid environment. As a result the emission and burning process may also be altered by the various humidity level of the inlet air. The effects of potassium sulfide in marine diesel on the combustion and emission characteristics of marine furnaces under varying levels of relative humidity of inlet air were experimentally investigated in this study. A cylindrical industrial furnace made of AISI 316 stainless steel, and an automatic oil-fired burner were used for the emission characteristics measurements and observation. A mechanically homogenizing machine was used to stir potassium sulfide (K_2SO_4) powder and marine diesel with a preset K_2SO_4 concentration. The relative humidity of the inlet air and temperature were adjusted to their assigned values by a large-size air conditioner before being pumped into the burner. The marine diesel oil mixture was atomized by the inlet air consequently ignited by an electrode and then burned within the horizontal furnace. There were eight rectangular slots cut in the upper portion of the furnace wall so that the probes of a gas analyzer and a thermocouple could be inserted into radial positions in the cylindrical furnace. The concentrations of gas emission and burning gas temperature and the combustion efficiency were analyzed. The experimental results show that the burning gas temperature, carbon dioxide emission and combustion efficiency decreased when the concentrations of excess air and oxygen emission increased with the addition of potassium sulfide in the marine diesel fuel. This is primarily attributed to the fact that the sulfide of an alkali compound such as K_2SO_4 may suppress the oxidation reaction process, leading to inferior combustion characteristics.
机译：降解燃料油通常出于经济目的在船用发电厂中使用，以减少运营费用。这些船用燃料油通常在燃料灰中包含各种金属元素的氧化物或硫化物，并且在不同程度上影响船用发电厂的燃烧和排放特性。此外，海洋电厂通常在高度潮湿的环境中运行。结果，排放和燃烧过程也可以通过进气的各种湿度水平来改变。通过实验研究了在变化的进气相对湿度下船用柴油中硫化钾对船用炉燃烧和排放特性的影响。使用AISI 316不锈钢制成的圆柱形工业炉和自动燃油燃烧器进行排放特性的测量和观察。使用机械均质机搅拌具有预设K_2SO_4浓度的硫化钾（K_2SO_4）粉和船用柴油。大型空气调节器将进气的相对湿度和温度调节到其指定值，然后再泵入燃烧器。船用柴油混合物被入口空气雾化，随后被电极点燃，然后在卧式炉中燃烧。在炉壁的上部切有八个矩形槽，以便可以将气体分析仪和热电偶的探头插入圆柱形炉的径向位置。分析了气体排放浓度，燃烧气体温度和燃烧效率。实验结果表明，随着船用柴油中硫化钾的添加，过量空气和氧气排放的浓度增加，燃烧气体的温度，二氧化碳的排放和燃烧效率降低。这主要归因于这样的事实，即诸如K_2SO_4的碱金属化合物的硫化物会抑制氧化反应过程，从而导致不良的燃烧特性。

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