公开(公告)号：US20020040889A1

公开(公告)日：2002-04-11

申请号：US09739748

申请日：2000-12-20

Applicant: Research Triangle Institute

Inventor： Robert J. Markunas ,  John B. Posthill ,  Robert C. Hendry ,  Raymond Thomas

IPC: B23K010/00

CPC classification number: H05H1/46 ,  Y10S588/90

Abstract: A method and apparatus for plasma waste disposal of hazardous waste material, where the hazardous material is volatilized under vacuum inside a containment chamber to produce a pre-processed gas as input to a plasma furnace including a plasma-forming region in which a plasma-forming magnetic field is produced. The pre-processed gas is passed at low pressure and without circumvention through the plasma-forming region and is directly energized to an inductively coupled plasma state such that hazardous waste reactants included in the pre-processed gas are completely dissociated in transit through the plasma-forming region. Preferably, the plasma-forming region is shaped as a vacuum annulus and is dimensioned such that there is no bypass by which hazardous waste reactants in the pre-processed gas can circumvent the plasma-forming region. The plasma furnace is powered by a high frequency power supply outputting power at a fundamental frequency. The power supply contains parasitic power dissipation mechanisms to prevent non-fundamental, parasitic frequencies from destabilizing the fundamental frequency output power. These power loss mechanisms use either distributed resistance or frequency-selective power-loss devices to prevent parasitic oscillations from instantaneously turning on the high frequency power oscillator at non-fundamental frequencies.

Abstract translation: 一种用于危险废物等离子体废物处理的方法和装置，其中危险材料在密封室内在真空下挥发，以产生预处理气体作为等离子体炉的输入，其包括等离子体形成区域，其中等离子体形成区域 产生磁场。 预处理气体在低压下通过等离子体形成区域而不规避，并被直接通电到感应耦合的等离子体状态，使得包含在预处理气体中的危险废物反应物在运输过程中完全离解通过等离子体 - 形成区域。 优选地，等离子体形成区域成形为真空环形区域，其尺寸使得不存在预处理气体中的危险废物反应物可绕过等离子体形成区域的旁路。 等离子炉由基频输出功率的高频电源供电。 电源包含寄生功率耗散机制，以防止非基波寄生频率不稳定基频输出功率。 这些功率损耗机制使用分布式电阻或频率选择性功率损耗器件来防止寄生振荡在非基频处瞬时接通高频功率振荡器。