Science: The Environment:
A New Type of Small and High Performance Heat Sources for Environmental Solutions
By Dr. Keiji Taniguchi,
Fukui University; Dr. Tsugio Matsuura, Fukui Industrial Technology Center;
The schematic diagram for the arc-plasma generation is illustrated in Fig. 1. The power source of multi-phase alternating currents that is converted from the three-phase commercial power supply is used for generating the arc-plasma. From our target, using two sets of electrodes (each set consisting of six electrodes) we can select either the two-dimensional arrangement constructed by six or twelve electrodes, or the three-dimensional arrangement constructed by both sets of electrodes as the operation mode of arc-plasma generation.
3. Estimation of minimum temperature
The energy radiated from the arc-plasma is measured by using a spectrometer. Fig. 2 shows an example of the spectral distribution which consists of two major parts: the black body radiation and the line spectral radiation. From the peak value of the black body radiation, we can estimate the minimum temperature value in the arc-plasma space. From Fig. 2, the wavelength λm of the peak point is approximately 570 (nm). Therefore, the temperature in the arc-plasma space is approximately 5000 (K) (this value was calculated by the formula:). The effect for the line spectral radiation shown in Fig. 2 is not contained here at all. Therefore, this is the minimum value of temperature.
Fig. 1. Schematic diagram for the arc-plasma generation
4. Examples of the processed results
The first example is that of incinerated Municipal Solid Waste (MSW) and the processed results are shown in Fig. 3(a) and Fig. 3(b), respectively. In example 2, the medical waste material (used syringes) and the processed result (melted needles and casings, which can then be recycled as raw material) are also shown in Fig. 4(a) and Fig. 4(b), respectively.
This method can easily obtain a significantly higher and wider temperature space as compared with traditional methods. This method is particularly useful for processing solid wastes which contain poisonous materials.
Fig. 2 Spectral distribution radiated from the arc-plasma space
(This illustrates the case of employing six electrodes. Current is 200A/phase. Voltage between phases is about 45(v))
Example 1: Municipal Solid Waste
Fig. 3(a) Incinerated MSW Fig. 3(b) Processed result
Example 2: Medical Waste
Fig. 4(a) Syringes Fig. 4(b) Processed result
Dr. Keiji Taniguchi is a member of the Editorial Advisory Board for Bibliotheque: World Wide/BWW Publishers and the BWW Society; he is currently Honorary Professor at Japan's Fukai University and at Xi'an University of Technology in Xi'an China.
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