| 摘要 |
PROBLEM TO BE SOLVED: To prevent backflow of a furnace side to an air side by pressure reducing and exhausting high pressure air and high temperature gas, when a boiler is emergency stopped so that the ratio of relief capacity of the air to that of the gas becomes equal to the ratio of the weight of the air to that of the gas. SOLUTION: An emergency pressure reduced mixed gas relief valve 22 is opened fully, after being equalized at emergency stop. A high temperature gas from emergency pressure reducing high temperature gas relief piping 18 and a high pressure air from emergency pressure reducing air relief piping 20 are mixed, temperature lowered by an emergency pressure reducing air high temperature gas mixer 21, and pressure reduced by an emergency pressure reducing mixed gas pressure reducing orifice 24. The mixed gas is reduced for noise by a silencer 25, dust removed by a dust removing tower 26, and then discharged from an discharge port 27 of the tower into the atmosphere. Here, a discharge ratio A:G of high pressure air A to high temperature gas G of the emergency pressure reducing system is set equal to a ratio Wa:Wg of the high pressure air weight Wa in the air system from high pressure air piping 3 to a wind case 8 to the high temperature gas weight Wg in the gas system from a flow layer 9 to a gas turbine inlet valve 14.
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