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IEC 60754-2-2019 电缆材料燃烧过程中产生的气体的试验--第2部分:酸度(通过pH测量)和电导率的测定 Test on gases evolved during combustion of materials from cables – Part 2: Determination of acidity (by pH measurement) and conductivity
This part of IEC 60754 specifies the apparatus and procedure for the determination of the potential corrosivity of gases evolved during the combustion of materials taken from electric or optical fibre cable constructions by measuring the acidity (pH) and conductivity of an aqueous solution resulting from the gases evolved during the combustion. The heating (combustion) procedure of this part of IEC 60754 is the same as in IEC 60754-3.<br />The general method specified in this standard is intended for the testing of individual components used in a cable construction. Formulae are given for the calculation of a weighted value for a combination of materials found in a specified cable. The use of this method will enable the verification of relevant requirements for either individual components or combined components of a cable construction stated in the appropriate cable specification.<br />A simplified method is included for the testing of individual components where it is required only to demonstrate compliance with a stated performance requirement for quality control purposes....
2023-05-02 22:36:01浏览：43
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乙醇与柴油混合燃料燃烧特性及排放特性的试验研究
在一台YC4112ZLQ增压柴油机上进行了不加任何助溶剂和着火改进剂的情况下,无水乙醇与柴油混合对柴油机燃烧过程影响的研究.试验结果表明,随着混合燃料中乙醇比例的提高,滞燃期延长,放热峰值增大,缸内最大爆发压力和最大压力升高率升高.与柴油相比,E10和E20有效热效率与原机相当,E30在高速大负荷工况热效率降低,NOx和碳烟排放明显降低;但HC和CO排放随着混合燃料中乙醇比例的增大,发动机转速为1 500 r/min时,HC排放和CO排放均降低,发动机转速为2 300 r/min时,HC排放和CO排放均有所升高....
2020-09-30 09:14:00浏览：30
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乙醇/柴油混合燃料燃烧过程与排放试验研究
在YZ4DB3柴油机上,通过测量燃用乙醇/柴油混合燃料的示功图和排放污染物,分析了燃烧过程与排放污染物的变化规律.结果表明,随着乙醇掺混比例的增加,乙醇/柴油混合燃料的滞燃期延长,燃烧终点提前,燃烧持续期缩短.小负荷时,与柴油相比,E10和E20的最大爆发压力分别下降了0.2、0.4 MPa,扩散燃烧放热率峰值升高；全负荷时,与柴油相比,乙醇/柴油混合燃料的最大爆发压力变化不大,预混燃烧放热率峰值升高.与燃用柴油相比,掺混乙醇能明显降低烟度,NOx排放变化不大；HC和CO排放随着乙醇掺混比例的增加而升高,小负荷时较明显.乙醇/柴油混合燃料的燃料消耗率与燃用柴油的燃油消耗率基本相同....
2020-09-30 09:14:00浏览：25
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