Joshi S, Wanner H U
Zentralbl Bakteriol Orig B. 1975 Jul;160(4-5):499-508.
Combustion of dust is an old problem which has gained a new importance since the introduction of electric storage heaters for space heating. Physico-chemical changes caused by heating indoor dust in a model apparatus were investigated. Four dust samples of different origins were heated at three temperatures (200, 400, 600 degrees C) for three residence times (5, 15, 30 min). The higher the temperature, the higher the weight loss expressed as percentage (15 to 75%). The residence time had no effect on the loss. Three dust samples showed pH of about 7 before heated, while the fourth showed pH of about 10. After heating to 200 degrees C, the pH of one of the samples rose from 7 to 10. When heated to 400 and 600 degrees C, all the samples showed pH values between 10 and 11. The residence time had no effect. The pH of the gaseous reaction products did not show uniform pattern at 200 degrees C. At 400 degrees C, the measured pH was between 7.5 and 8.5, while at 600 degrees C no further change was observed. Changes in pH took place during the first fifteen minutes. Chemical analysis of the reaction products with help of detector tubes indicated that dust samples when heated emit carbon monoxide, carbon dioxide, oxides of nitrogen and ammonia.
粉尘燃烧是一个老问题，自从引入用于空间供暖的蓄电式加热器后，它又有了新的重要性。对在模型装置中加热室内粉尘所引起的物理化学变化进行了研究。对四个不同来源的粉尘样本在三个温度（200、400、600摄氏度）下加热三个停留时间（5、15、30分钟）。温度越高，以百分比表示的重量损失越高（15%至75%）。停留时间对损失没有影响。三个粉尘样本在加热前pH约为7，而第四个样本的pH约为10。加热到200摄氏度后，其中一个样本的pH从7升至10。加热到400和600摄氏度时，所有样本的pH值在10至11之间。停留时间没有影响。气态反应产物的pH在200摄氏度时没有呈现出统一的模式。在400摄氏度时，测得的pH在7.5至8.5之间，而在600摄氏度时未观察到进一步变化。pH变化发生在最初的十五分钟内。借助检测管对反应产物进行化学分析表明，粉尘样本加热时会释放一氧化碳、二氧化碳、氮氧化物和氨。
