The welding fume has significant effects on the weld workers＇ health. In order to overwhelm the shortcomings of the control measures of the welding fume, the research of the purifying of welding fume on the spot was ...The welding fume has significant effects on the weld workers＇ health. In order to overwhelm the shortcomings of the control measures of the welding fume, the research of the purifying of welding fume on the spot was carried out. The purifying device was designed. The relationship between the corona discharge voltage and the purifying efficiency was investigated through experiments with different needle electrode numbers, different ring electrode numbers and different needle-plate distances. The results show that 5-needle double-ring electrode has the best efficiency; the purifying efficiency is increase with the lessening of the needle-plate distance and the increase of the discharge voltage. Using 5-needle double-ring electrode, the purifying efficiency reaches its maximum value 97.9% while the needle-plate distance is 6 cm, the discharge voltage is -35 kV. The purifying device has an excellent purifying effect on the welding fume.展开更多
目的探讨以大流量采样器采样，增加滤膜粉尘颗粒负载，来解决样本增重过低，以至于达不到最低检出限（1imit of detection，LOD）的问题。方法在A和B2家造船厂，采用高流量FSP-10和常规流量FSP-2呼吸性粉尘采样器，在同一电焊作业地点...目的探讨以大流量采样器采样，增加滤膜粉尘颗粒负载，来解决样本增重过低，以至于达不到最低检出限（1imit of detection，LOD）的问题。方法在A和B2家造船厂，采用高流量FSP-10和常规流量FSP-2呼吸性粉尘采样器，在同一电焊作业地点平行采集呼吸性电焊烟尘。FSP-10采气流量为10L／min，FSP-2为2Umin，采样持续时间分别为3．O-4．0h和2．0-2．5h。比较分析这两种采样器所获样本的增重、粉尘浓度以及LOD的符合率。结果大流量旋风器FSP-10采集样本的粉尘增重在A和B2家船厂分别为（0．97±0．40）和（1．61±0．86）mg，明显高于常规流量FSP-2的（O．29±0．12）和（0．51±0．27）mg，差异有统计学意义（P〈0．05）。并把LOD符合率平均由26．8％（FSP-2采集时，2厂的样本合计）提高到89．7％，差异有统计学意义（X^2值=32．9085，R0．01）。大流量旋风器FSP-10与常规流量旋风器FSP-2所测呼吸性粉尘浓度比较，差异无统计学意义（P〉0．05）。常规流量旋风器FSP-2采样时间与其样本增重呈正相关关系（R^2=0．7906，y=0．0026x），若达到LOD（0．5mg），常规流量旋风器FSP-2采样时间应该≥192.3min。结论大流量旋风器FSP-10可以提高样本增重，基本上解决了LOD符合率过低的问题，而且所测粉尘浓度与常规流量旋风器FSP-2的差别不显著。展开更多
文摘The welding fume has significant effects on the weld workers＇ health. In order to overwhelm the shortcomings of the control measures of the welding fume, the research of the purifying of welding fume on the spot was carried out. The purifying device was designed. The relationship between the corona discharge voltage and the purifying efficiency was investigated through experiments with different needle electrode numbers, different ring electrode numbers and different needle-plate distances. The results show that 5-needle double-ring electrode has the best efficiency; the purifying efficiency is increase with the lessening of the needle-plate distance and the increase of the discharge voltage. Using 5-needle double-ring electrode, the purifying efficiency reaches its maximum value 97.9% while the needle-plate distance is 6 cm, the discharge voltage is -35 kV. The purifying device has an excellent purifying effect on the welding fume.
文摘目的探讨以大流量采样器采样，增加滤膜粉尘颗粒负载，来解决样本增重过低，以至于达不到最低检出限（1imit of detection，LOD）的问题。方法在A和B2家造船厂，采用高流量FSP-10和常规流量FSP-2呼吸性粉尘采样器，在同一电焊作业地点平行采集呼吸性电焊烟尘。FSP-10采气流量为10L／min，FSP-2为2Umin，采样持续时间分别为3．O-4．0h和2．0-2．5h。比较分析这两种采样器所获样本的增重、粉尘浓度以及LOD的符合率。结果大流量旋风器FSP-10采集样本的粉尘增重在A和B2家船厂分别为（0．97±0．40）和（1．61±0．86）mg，明显高于常规流量FSP-2的（O．29±0．12）和（0．51±0．27）mg，差异有统计学意义（P〈0．05）。并把LOD符合率平均由26．8％（FSP-2采集时，2厂的样本合计）提高到89．7％，差异有统计学意义（X^2值=32．9085，R0．01）。大流量旋风器FSP-10与常规流量旋风器FSP-2所测呼吸性粉尘浓度比较，差异无统计学意义（P〉0．05）。常规流量旋风器FSP-2采样时间与其样本增重呈正相关关系（R^2=0．7906，y=0．0026x），若达到LOD（0．5mg），常规流量旋风器FSP-2采样时间应该≥192.3min。结论大流量旋风器FSP-10可以提高样本增重，基本上解决了LOD符合率过低的问题，而且所测粉尘浓度与常规流量旋风器FSP-2的差别不显著。
