ZHANG Fu-ming
,
MAO Qing-wu
,
MEI Cong-hua
,
LI Xin
,
HU Zu-rui
钢铁研究学报(英文版)
In Shougang Jingtang 5500 m3 huge blast furnace (BF) design, dome combustion hot blast stove (DCHBS) technology is developed. DCHBS process is optimized and integrated, and reasonable hot blast stove (HBS) technical parameters are determined. Mathematic model is established and adopted by computational fluid dynamics (CFD). The transmission theory is studied for hot blast stove combustion and gas flow, and distribution results of HBS velocity field, CO density field and temperature field are achieved. Physical test model and hot trail unit are established, and the numeral calculation result is verified through test and investigation. 3-D simulation design is adopted. HBS process flow and process layout are optimized and designed. Combustion air two-stage high temperature preheating technology is designed and developed. Two sets of small size DCHBSs are adopted to preheat the combustion air to 520-600 ℃. With the precondition of BF gas combustion, the hot blast stove dome temperature can exceed 1420 ℃. According to DCHBS technical features, reasonable refractory structure is designed. Effective technical measures are adopted to prevent hot blast stove shell intercrystalline stress corrosion. Hot blast stove hot pipe and lining system are optimized and designed. After blowing in, the blast temperature keeps increasing, and the monthly average blast temperature reaches 1300 ℃ when burning single BF gas.
关键词:
dome combustion hot blast stove
,
high blast temperature
,
ceramic burner
,
high temperature combustion air preheating
,
CFD
余长林
,
周晚琴
,
杨凯
,
李立清
,
CHAO Fang-Fang
,
LI Xin
无机材料学报
doi:10.3724/SP.J.1077.2010.10282
通过设计反相微乳液反应体系,在水热条件下缓慢氧化SnF2,合成了单分散的四方形SnO2纳米晶.利用X射线多晶粉末衍射、扫描电镜、高分辩透射电镜对合成样品的形貌和结构进行了表征.实验结果表明,通过控制油胺的添加量调控微乳液水相的pH值,可以对SnO2的形貌进行调控.使用适当量的油胺,可以获得分散性极好、大小为10 nm左右的规则四方SnO2纳米晶.合适的pH值有利于晶核的定向生长,从而在微乳液反应器中形成了规则的SnO2四方纳米晶.
关键词:
反相微乳液
,
四方SnO2纳米晶
,
油胺
,
水热
