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首页> 外文学位 >Plasma process applications: Analysis of wire electrical discharge machining (EDM) process and conversion of methane to acetylene using plasma reactor.
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Plasma process applications: Analysis of wire electrical discharge machining (EDM) process and conversion of methane to acetylene using plasma reactor.

机译：等离子工艺的应用：分析电火花线切割（EDM）工艺以及使用等离子反应器将甲烷转化为乙炔。

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Two applications of plasma process are studied: wire electrical discharge machining (EDM) process and conversion of methane to acetylene process. On the wire EDM process, the causes of wire vibration, bowing and breakage are identified. The cross-sectional configuration of an eroded wire is determined. A computational model has been developed that can predict conditions of wire breakage by determining the stress induced by wire erosion and the stress induced by the sparks during the operation of a wire-cutting EDM machine. This model is also capable of determining the extent of wire bowing and vibrations in these machines but only in the frontal direction. The model is supported by data from experiments performed on an AGIECUT 612 wire machine cutting a 10 mm high copper bar with a 0.15 mm diameter brass wire to acquire wire breakage data. Thermal load, another major factor contributing to the wire breakage, is also discussed. Here, the temperature profile of the wire as a function of axial position is determined using quasi steady state thermal analysis. A dynamic analysis of multiple, sequential sparks in the same location on the wire was done to estimate the hot spot about 73°C after one spark, 93°C after two sparks, 110°C after three sparks, and 195°C after eight sparks.; Conversion of methane to acetylene process is also studied. A simplified calculation to determine the equilibrium number of moles and mole fractions of the final products (methane, acetylene, ethylene, and hydrogen) of the process for different process temperatures is done. Experiments to carry out the process are conducted using a plasma spray-coater reactor. Several factors affecting the final products are studied. These factors are power input, methane flowrate, amount of additives (ethane and hydrogen), and quench position. The conversion process is also carried out using an electrical-furnace reactor setup for comparison with the plasma reactor experiments.
机译：研究了等离子体工艺的两种应用：线放电加工（EDM）工艺和甲烷到乙炔的转化工艺。在电火花线切割加工过程中，确定了导致线振动，弯曲和断裂的原因。确定被侵蚀的线的横截面构造。已经开发出一种计算模型，该模型可以通过确定在电火花线切割机的操作过程中，确定由导线腐蚀引起的应力和由火花引起的应力来预测导线断裂的情况。该模型还能够确定这些机器中导线弯曲和振动的程度，但只能沿正面方向。该模型得到了在AGIECUT 612线切割机上进行的实验数据的支持，该切割机使用直径为0.15毫米的黄铜丝切割10毫米高的铜棒以获得断线数据。还讨论了热负荷，这是造成断线的另一个主要因素。在此，使用准稳态热分析来确定作为轴向位置的函数的导线温度曲线。对电线上相同位置的多个连续火花进行了动态分析，以估算一个火花后约73°C，两个火花后约93°C，三个火花后约110°C的热点。 ，并在经过八次火花放电后达到195°C。还研究了甲烷转化为乙炔的过程。进行了简化的计算以确定在不同工艺温度下该工艺的最终产物（甲烷，乙炔，乙烯和氢）的摩尔数和摩尔分数的平衡数。使用等离子喷涂机反应器进行进行该方法的实验。研究了影响最终产品的几个因素。这些因素是功率输入，甲烷流量，添加剂（乙烷和氢气）的量以及淬火位置。还使用电炉反应器装置进行转化过程，以与等离子体反应器实验进行比较。

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