科技导报
科技導報
과기도보
SCIENCE & TECHNOLOGY REVIEW
2010年
6期
98-102
,共5页
陈志刚%王少雷%毛首蕾%王永伟
陳誌剛%王少雷%毛首蕾%王永偉
진지강%왕소뢰%모수뢰%왕영위
高流场%亚微米粉尘%荷电凝并%电除尘器效率
高流場%亞微米粉塵%荷電凝併%電除塵器效率
고류장%아미미분진%하전응병%전제진기효솔
high flow%submicron dust%charging and coagulation%efficiency of ESP
目前电除尘器存在微小颗粒粉尘捕集效率低、本体体积庞大和能耗高等问题.本文基于烟道中粒子动量高,放电通道中离子输运特性较好的特点,将离子源、荷电凝并装置设置于电除尘器前烟道中.实验结果表明,离子浓度随电场强度加大而增加;在高离子动量情况下,烟道中的离子浓度可达到1.97×10~9/cm~3,比现有电除尘器的离子浓度高出2~3个数量级;矩形电晕极优于圆形电晕极,而芒刺电晕极起晕电压低,耗能少,产生离子浓度高且稳定.因此以芒刺电晕极为最佳;中位径为0.2μm的硅粉、中位径为6μm的滑石粉和两种粉体的混合粉等微细颗粒荷电凝并后被粗化为电除尘器有效捕集的颗粒,电捕集效率显著提高.本实验可在不增加电除尘器室数、不改变原有运行方式和运行参数条件下,有效解决现有电除尘器预荷电离子浓度过低问题,增大其捕集效率.
目前電除塵器存在微小顆粒粉塵捕集效率低、本體體積龐大和能耗高等問題.本文基于煙道中粒子動量高,放電通道中離子輸運特性較好的特點,將離子源、荷電凝併裝置設置于電除塵器前煙道中.實驗結果錶明,離子濃度隨電場彊度加大而增加;在高離子動量情況下,煙道中的離子濃度可達到1.97×10~9/cm~3,比現有電除塵器的離子濃度高齣2~3箇數量級;矩形電暈極優于圓形電暈極,而芒刺電暈極起暈電壓低,耗能少,產生離子濃度高且穩定.因此以芒刺電暈極為最佳;中位徑為0.2μm的硅粉、中位徑為6μm的滑石粉和兩種粉體的混閤粉等微細顆粒荷電凝併後被粗化為電除塵器有效捕集的顆粒,電捕集效率顯著提高.本實驗可在不增加電除塵器室數、不改變原有運行方式和運行參數條件下,有效解決現有電除塵器預荷電離子濃度過低問題,增大其捕集效率.
목전전제진기존재미소과립분진포집효솔저、본체체적방대화능모고등문제.본문기우연도중입자동량고,방전통도중리자수운특성교호적특점,장리자원、하전응병장치설치우전제진기전연도중.실험결과표명,리자농도수전장강도가대이증가;재고리자동량정황하,연도중적리자농도가체도1.97×10~9/cm~3,비현유전제진기적리자농도고출2~3개수량급;구형전훈겁우우원형전훈겁,이망자전훈겁기훈전압저,모능소,산생리자농도고차은정.인차이망자전훈겁위최가;중위경위0.2μm적규분、중위경위6μm적활석분화량충분체적혼합분등미세과립하전응병후피조화위전제진기유효포집적과립,전포집효솔현저제고.본실험가재불증가전제진기실수、불개변원유운행방식화운행삼수조건하,유효해결현유전제진기예하전리자농도과저문제,증대기포집효솔.
Due to the inefficiency of collecting submicren dust, the current electrostatic precipitator (ESP) suffers from disadvantages of great size and much consumed energy. This paper proposes to put the ion source and the charging and coagulation equipment in the flue,to secure a high ion transportation rate with high particle momentum. The results show that the ion density is increased with the increase of the electric field intensity. In the condition of high momentum, the ion density reaches 1.97x10~9/cm~3, 2~3 orders of magnitude higher than that of ESP. Rectangular powered electrodes are shown to be better than circular powered electrodes. The prickle powered electrodes, with low corona onset voltage, consume less power and generate ions of high density in a stable way. So the prickle powered electrodes are the best choice. Median-particle-size of 0.2μm silicon powder, median-particle-size of 6μm talcum powder and the mixed powder of silicon powder and talcum powder were charged and coagulated to big particles. The efficiency of ESP is significantly improved. A charging system equal to a room of ESP can be saved. The problem of low efficiency of the current ESP can be solved without the need to increase the rooms of ESP and to change the running matter and the parameters, but only by making use of the high momentum of charging particles in the flue.