Heat Exchange Tube and Tube Sheet
welding between heat exchanging tube and tube sheet
a lance with two points
accelerated melting by coal oxygen lance
air lance
空气喷管
恒定势
空气吹灰枪
空气吹灰器
恒电位
用空气清除
吹管
back draught oxygen lance
Coherent Jet Oxygen Lance
Desulphurization injection lance