One Question per Day (March 15, 2018)
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In the semi-water gas used for ammonia synthesis, which substances are considered impurities, and it is desirable to keep their concentrations as low as possible? The less impurities such as H2S, CO2, and CH4, the better
Gases such as O:, CH4, and CO: in semi-water gas are inert gases. In addition to affecting safe production, a high oxygen content means that two parts of hydrogen are required to consume one part of oxygen during the conversion process. The methane present in semi-water gas does not disappear during the production process; it accumulates in the synthesis cycle gas. When it reaches a certain level, it must be released. However, when methane is emitted, hydrogen and nitrogen are also released simultaneously. The lower the methane content in the synthesis cycle gas, the higher the proportion of hydrogen and nitrogen that is emitted. An increase in CO in semi-water gas means a decrease in the effective gas.
Impurities such as CO, CO2, H2S, etc.
Answer: The less impurities such as H2S, CO2, and CH4, the better
Does coal ash count? Sulfides, H2S, CH4
Carbon black particles and nitrogen oxides and organic sulfides
Answer: The less impurities such as H2S, CO2, and CH4, the better
Sulfides are considered impurities; the main one is H2S (90%), followed by organic sulfur compounds such as CS2, COS, and RSH. The lower the concentration of sulfides, the better.
Inert gases such as carbon dioxide, hydrogen sulfide, methane, etc