摘要:大氣污染已成為全世界城市居民生活中一個無法逃避的現實。2009年，全國粉煤灰排放達到3.75億噸。大氣污染控制主要設備之一為電除塵器，除塵效率高、能耗低、能處理溫度高煙氣量大。而粉塵比電阻是表述粉塵導電性能的基本指標，是電除塵器設計及運行調整的重要參數。粉塵比電阻過大或過小都不利于電除塵器的穩定、正常運行，將對除塵效率產生影響，一般粉塵比電阻在104~5×1010（Ω•cm）范圍內最適合電除塵。

本課題采用掃描電子顯微鏡-X射線能譜儀對粉塵試樣的化學成分進行測定，并在DR2-1000型高溫比電阻試驗儀上對粉塵試樣比電阻進行試驗分析，重點探索了粉塵在高溫下比電阻隨化學成分、溫度的變化規律。

研究結果表明：

（1）溫度在100~900°C范圍內，比電阻最大值為1012~1013Ω•cm，最小值為104~107Ω•cm。溫度在450°C以上時，粉塵比電阻值隨溫度升高而下降。

（2）溫度從峰值到900°C時，粉塵比電阻和溫度滿足關系式

（3）粉塵中SiO2含量高，出現比電阻峰值的溫度低；鐵，鋁含量高，出現比電阻峰值的溫度高。溫度達到900°C時，SiO2含量越高，比電阻值越大。

關鍵字：粉塵比電阻，溫度，化學成分

Abstract:Air pollution is one of the realities that all people around the world can't avoid. In 2009, the amount of coal ash let out is 375 million tons. One of the main equipments that control air pollution is electrical precipitator, which has high efficiency of dust collection, low power, ability to deal with large amount and high temperature dust. The dust resistivity is the basic quota indicates the dust electric conductivity, which is the key parameter to electric precipitator's design and adjustment . The dust resistivity oversized or too small does not favor the electric precipitator stably, and  influence the efficiency to remove dust, generally the dust resistivity, in the scope in 104~5×1010(Ω•cm) most suits the electricity dust removal. 

This study uses the scanning electronic microscope - X-ray spectrometer to test specimen chemical composition, and carries on the experiment on the DR2-1000 high temperature resistivity tester to analyze the dust, emphasis under the high temperature the resistivity changes along with the chemical composition and temperature.

Results:

1..Among 100-900°C, the resistivity maximum values 1012~1013Ω•cm, the minimum values 104~107Ω•cm. When the temperature is above 450°C, the resistivity has an inverse ratio to temperature.

2.Among peak value to 900°C, the dust resistivity and the temperature satisfy the relationship .

3.In the dust, if the SiO2 content is high, the temperature resistivity peak value presents to be low; if the iron, the aluminum content is high, the temperature resistivity peak value presents to be high. When the temperature achieves 900°C, the SiO2 content is higher, the resistivity value is bigger.  

Keyword: Dust resistivity, Chemical composition, Temperature