中国电机工程学报
中國電機工程學報
중국전궤공정학보
ZHONGGUO DIANJI GONGCHENG XUEBAO
2013年
26期
21-26
,共6页
仲蕾%宋蔷%黄乾泽%姚强
仲蕾%宋薔%黃乾澤%姚彊
중뢰%송장%황건택%요강
选择性非催化还原%液滴%蒸发%分解%尿素
選擇性非催化還原%液滴%蒸髮%分解%尿素
선택성비최화환원%액적%증발%분해%뇨소
selective non-catalytic reduction (SNCR)%droplet%evaporation%decomposition%urea
主要围绕SNCR温度区间内尿素液滴的蒸发和转化特性开展研究。建立了尿素液滴蒸发和转化过程的在线观测实验系统和数据处理方法,可定量化描述蒸发和转化过程中的尿素液滴粒径变化。实验发现,尿素液滴在高温环境中主要经历了水分蒸发和尿素分解两个阶段,水分蒸发阶段的特征与单质水基本一致,尿素分解阶段的特征与单质尿素基本一致,在尿素分解阶段伴随有微爆现象。温度、尿素溶液浓度的增加会缩短尿素液滴第1阶段的标准化蒸发时间,加剧第2阶段的微爆现象,而液滴初始粒径对第1阶段的影响较小。
主要圍繞SNCR溫度區間內尿素液滴的蒸髮和轉化特性開展研究。建立瞭尿素液滴蒸髮和轉化過程的在線觀測實驗繫統和數據處理方法,可定量化描述蒸髮和轉化過程中的尿素液滴粒徑變化。實驗髮現,尿素液滴在高溫環境中主要經歷瞭水分蒸髮和尿素分解兩箇階段,水分蒸髮階段的特徵與單質水基本一緻,尿素分解階段的特徵與單質尿素基本一緻,在尿素分解階段伴隨有微爆現象。溫度、尿素溶液濃度的增加會縮短尿素液滴第1階段的標準化蒸髮時間,加劇第2階段的微爆現象,而液滴初始粒徑對第1階段的影響較小。
주요위요SNCR온도구간내뇨소액적적증발화전화특성개전연구。건립료뇨소액적증발화전화과정적재선관측실험계통화수거처리방법,가정양화묘술증발화전화과정중적뇨소액적립경변화。실험발현,뇨소액적재고온배경중주요경력료수분증발화뇨소분해량개계단,수분증발계단적특정여단질수기본일치,뇨소분해계단적특정여단질뇨소기본일치,재뇨소분해계단반수유미폭현상。온도、뇨소용액농도적증가회축단뇨소액적제1계단적표준화증발시간,가극제2계단적미폭현상,이액적초시립경대제1계단적영향교소。
This study focused on the evaporation and conversion process of urea aqueous solution droplet and the process characterization in the temperature range for selective non-catalytic reduction (SNCR). An in-situ observation system was built to study the evaporation and conversion of urea aqueous solution droplet. Based on the analysis of droplet photo, the droplet diameter variation can be quantified. The evaporation and conversion process of urea aqueous solution droplet can be divided into two stages. The first stage (water evaporation) is consistent with the simple substance water and the second stage is basically the same characteristics as evaporation and decomposition of pure urea particle. Increase in evaporation temperature or solution concentration shortens the characteristic time of the first stage and promotes the microexplosion in the second stage. Change in initial droplet size has little influence on the characteristics of the evaporation process in the first stage.