Improvement in Efficiency of High Temperature Treatment of Waste by Sound Wave Application

应用声波提高废物高温处理效率

• 批准号: 12650731
• 负责人: KOMAROV Sergei V
• 金额: $ 2.24万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650731/
• 关键词: High temperature exhaust gas; Sonoprocessing; Agglomeration efficiency of dust particles; Enhancement of NO reduction; Control of interface heat transfer; Effect of frequency; Effect of sound pressure; Effect of temperature; 音波; 廃棄物; 高音処理; 燃焼 /

1. Behavior of Dust Particles in High Temperature Exhaust Gas during Sound Wave ApplicationA sample of Zn (10 g) was evaporated inside a crucible of vertically arranged experimental set-up, then the vapor was transferred into the set-up working space by Ar carrier gas. Cooling of vapor-containing gas resulted in formation of Zn droplets and/or particles (size 1〜100 μm) which were exposed to powerful sound waves. The particle samples were taken at places of different temperatures. The results revealed that the sound waves forces particles to collide and to form agglomerates between each other. In the low frequency range (35〜992 Hz), the agglomeration efficiency is controlled by sound pressure and independently of frequency. In the high frequency range (6.9〜17.2 kHz), both the frequency and sound pressure govern the agglomeration efficiency. For the both frequency ranges, the higher the temperature, the better is the agglomeration efficiency.2. Improvement in NO Reduction Efficiency by A … More coustic OscillationsSound waves (frequency 6.9〜17.2 kHz) that were produced by the Hartmann sound generators mounted on the top part of a vertical reaction tube. A graphite disc was positioned in the tube bottom part preheated up to certain temperatures (873〜1173 K). An Ar-NO mixture (NO 911〜934 ppm) was blown onto the disc surface to perform reactions between C and NO. Without sound wave application, NO content in flue gas was reduced to a level of 200 〜 600 ppm. Exposing the disc surface to sound waves resulted in the further decrease in NO content to 50 〜 250 ppm. The NO reduction efficiency was found to be dependent on the sound frequency, intensity, gas flow rate and temperature.3. Enhancement of Gas Phase Heat Transfer by Acoustic Field ApplicationExperiments are carried out by using preheated Pt wires (length 0.1〜0.15 m, diameter 50 and 100 μm) positioned at velocity antinode of a standing wave (frequency 216〜1031 Hz) or in the path of a traveling wave (frequency 6.9〜17.2 kHz). Air was blown to the wire surface. Effects of sound frequency, sound strength, blowing gas velocity and wire preheating temperature on augmentation of Nusselt number relative to the natural convection conditions are examined. The gas phase heat transfer rate is enhanced with acoustic field strength. Higher temperatures result in a vigorous radiation from the wire surface and attenuate effect of sound. The large the velocity of blowing gas, the smaller is the effect of sound wave on heat transfer enhancement. Less

1.高温废气中粉尘颗粒在声波作用下的行为将10g的锌样品在垂直布置的实验装置中蒸发，然后通过Ar载气将蒸汽转移到装置工作空间。含蒸汽气体冷却后会形成锌液滴和/或颗粒(尺寸为1~100μm)，并暴露在强大的声波中。颗粒样品是在不同温度的地方采集的。结果表明，声波迫使粒子相互碰撞，并在彼此之间形成团聚。在低频段(35~992 Hz)，聚团效率受声压控制，与频率无关。在高频段(6.9~17.2 kHz)，频率和声压共同控制着聚团效率。在这两个频率范围内，温度越高，团聚效率越高。…提高NO还原效率的研究竖直反应管顶部安装的哈特曼声源产生的声波(频率为6.9~17.2 kHz)。在预热到一定温度(873~1173K)的管子底部放置一个石墨盘。将Ar-NO混合物(NO911~934ppm)吹到圆盘表面，进行C和NO之间的反应。在不使用声波的情况下，烟气中的NO含量可降低到200~600ppm。将光盘表面暴露于声波可使NO含量进一步降低至50~250ppm。NO还原效率与声频、声强、气体流量和温度有关。声场强化气相换热实验采用预热铂丝(长0.1~0.15m，直径5 0和10 0μm)，分别位于驻波(频率2 16~10 31 Hz)和行波(频率6.9~17.2 kHz)的速度波前。空气被吹到了电线表面。研究了声频、声强、吹气速度和钢丝预热温度对自然对流条件下努塞尔数增大的影响。气相换热速率随声场强度的增大而增大。较高的温度会导致导线表面产生强烈的辐射，并减弱声音的影响。吹气速度越大，声波对强化换热的影响越小。较少

项目成果

S.V.Komarov,M.Kuwabara,M.Sano: "Suppression of Slag Foaming under Sound Wave Application"ISIJ International. 40,5. 431-437 (2000)

S.V.Komarov、M.Kuwabara、M.Sano：“声波应用下炉渣泡沫的抑制”ISIJ International。

S.Komarov, M.Kuwabara, M.Sano: "Suppressing of slag foaming by a sound wave"Ultrasonic sonochemistry. 7. 193-199 (2000)

S.Komarov、M.Kuwabara、M.Sano：“通过声波抑制炉渣泡沫”超声波声化学。

K.Okumura, S.Komarov, M.Sano: "Gas Injection from Various Shape Slot Nozzles in Water"ISIJ International. 40. 544-548 (2000)

K.Okumura、S.Komarov、M.Sano：“水中各种形状狭缝喷嘴的气体注入”ISIJ International。

S.V.Komarov,M.Kuwabara,M.Sano: "Suppressing of slag foaming by a sound wave"Ultrasonic sonochemistry. 7. 193-199 (2000)

S.V.Komarov、M.Kuwabara、M.Sano：“通过声波抑制炉渣泡沫”超声波声化学。

T.Uda, S.Komarov, M.Hirasawa: "Dry Separation for rare earth by Vacuum Distillation of Di and Triiodide Mixture"Materials Transactions. 42. 1813-1819 (2001)

T.Uda、S.Komarov、M.Hirasawa：“通过真空蒸馏二碘化物和三碘化物混合物来干式分离稀土”材料交易。