OPENING/CLOSING MECHANISM OF SUPPLY VALVE OF INJECTION MEDIUM OF LONG RETRACTABLE SOOT BLOWER

摘要

PROBLEM TO BE SOLVED: To prevent the thermal shock damage of a lance pipe in a long retractable soot blower used for sweeping off the soot of a wall at the rear of the furnace of a coal-heating boiler. SOLUTION: In the long retractable soot blower 60 for removing built-up and deposits for purifying the inside of a furnace by inserting a lance pipe 31 into the furnace 1 of a boiler or the like and then injecting a high-pressure injection medium from the tip nozzle, the opening/closing mechanism of a head valve 52 for supplying the vapor of the injection medium to the lance pipe 31 is opened or closed in two steps of half open and total open, and includes an opening/closing mechanism for including an opening/closing cam 67 for half-opening the head valve 53 and an opening/closing mechanism for including an opening/closing cam 65 for totally opening the head valve 53.