自20世纪50~60年代老化房在发明和开始推广起，老化房冷却除尘就大量使用一种碗形喷嘴，目前还在广泛应用。有些钢厂也采用反溅式和三线内螺旋型喷嘴。碗形喷嘴的最主要问题是易堵塞，比如某厂一文所用的碗形喷嘴，刚用时喷水量为80#90t/h，使用约一周后喷水量就只有40#50t/h。喷嘴堵塞后自然冷却能力不足；另外喷嘴体积大，产生的阻力也大。
Since the invention and popularization of aging rooms in the 1950s and 1960s, a bowl-shaped nozzle has been widely used in cooling and dust removal of aging rooms. Some steel mills also use anti-splash and three-wire internal spiral nozzles. The main problem of bowl nozzle is easy to plug. For example, the bowl nozzle used in a factory is 80 The natural cooling capacity is insufficient after the nozzle is blocked. In addition, the volume of the nozzle is large and the resistance is large.
国外发达国家的一些钢厂老化房采用干法电除尘。在干法电除尘中，对喷嘴的雾化冷却效果要求就更加严格，因为烟气温度低于露点温度，粉尘会粘结到电极板上，不仅增加工作量，而且会使电除尘起不到除尘作用；烟气温度过高则粉尘的比电阻过高，电除尘系统也会形同虚设。采用布袋干式除尘也有类似的问题。
Dry electrostatic precipitation is used in aging rooms of some steel plants in developed countries. In dry electrostatic precipitation, the requirement for atomization cooling effect of nozzle is more stringent, because the temperature of flue gas is lower than dew point temperature, dust will adhere to the electrode plate, not only increase workload, but also make electrostatic precipitation can not play a role in dust removal; if the temperature of flue gas is too high, the specific resistance of dust is too high, and the electrostatic precipitation system will also be virtual. There are similar problems with bag dry dust removal.
