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    • 1. 发明授权
    • Method of determining knock resistance rating for non-commercial grade
natural gas
    • 确定非商业级天然气的爆震阻力等级的方法
    • US6061637A
    • 2000-05-09
    • US932905
    • 1997-09-17
    • Gregory W. SorgeRichard J. KakoczkiJohn E. Peffer
    • Gregory W. SorgeRichard J. KakoczkiJohn E. Peffer
    • G01L23/22G01N33/22G01N33/28
    • G01L23/225G01N33/225
    • A method for calculating knock resistance ratings for various blends of non-commercial grade natural gas involves the use of a computer model derived from collecting experimental data for constituent concentration levels typical in field grade natural gas. The computer model is derived using a MN (methane number) calibration curve for various natural gas compositions typical at the wellhead. The empirically-derived computer model considers concentrations of the following molar constituents: methane (60%-100%); ethane (0%-20%); propane (0%-40%); normal butane (0%-10%); normal pentane (0%-3%); mixtures of higher order hydrocarbons (0%-2%); nitrogen (0%-15%) and carbon dioxide (0%-10%). The knock characteristics of isomers of butane and pentane are accounted for by assigning fractions of their concentrations to concentrations of modeled constituents. If the concentration levels lie outside of acceptable ranges and normalization is insufficient to correct for concentration levels, an alternative method (preferably the carbon-hydrogen ratio method) is used to calculate knock resistance rating. Excessive concentrations of inert gases such as carbon dioxide and nitrogen are accounted for separately using an empirically-based algorithm, thus the model can be extended to landfill and digester gases which typically have high concentrations of carbon dioxide.
    • 用于计算非商业级天然气各种混合物的爆震阻力等级的方法涉及使用从田间级天然气中典型的组分浓度水平收集实验数据得到的计算机模型。 计算机模型使用MN(甲烷数)校准曲线得出,用于在井口处典型的各种天然气组成。 经验导出的计算机模型考虑以下摩尔成分的浓度:甲烷(60%-100%); 乙烷(0%-20%); 丙烷(0%-40%); 正丁烷(0%-10%); 正戊烷(0%-3%); 高级烃的混合物(0%-2%); 氮(0%-15%)和二氧化碳(0%-10%)。 丁烷和戊烷的异构体的敲除特性是通过将其浓度分数指定为模拟成分的浓度来计算的。 如果浓度水平超出可接受的范围,并且归一化不足以校正浓度水平,则使用替代方法(优选碳氢比法)来计算爆震阻力等级。 使用基于经验的算法分别考虑过多的惰性气体如二氧化碳和氮气,因此该模型可以扩展到通常具有高浓度二氧化碳的垃圾填埋场和蒸煮器气体。