In order to study the influence of nozzles blocking of a 210 t RH unit up-snorkel on circulation flow rate
the 1:4 water model test has been carried out. Results show that with numbers of blocking nozzles in sequence being more than 3
the circulation flow rate decreases obviously; as the number of blocking nozzles is same
the decrease of circulation flow rate with blocking nozales in symmetry is less than that with blocking nozzles in sequence; RH process could be normalcontinuous as the numbers of blocking nozzles are 3 or less than 3;and with lowing the location of nozzles the circulation flow rate increases markedlv.