| 摘要 |
PROBLEM TO BE SOLVED: To shorten the cooling time of a negative pressure circulation type pulverized coal-blowing facility, to expand the nitrogen purge are of the facility, and to add a leakage check function to the facility.SOLUTION: A negative pressure circulation type pulverized coal-blowing facility comprises a pulverizer 1, a gas heater 2, a dust collector 3, an exhaust gas circulation unit 4, a diluting air supply device 5, and further, a hot air delivery pipe 8, a pulverized coal/exhaust gas pipe 9, an exhaust gas discharge pipe 10, a first duct 11 for diffusing the exhaust gas into the atmosphere, and a connection pipe 13. In the facility, there is provided a nitrogen gas supply unit 6 capable of supplying a nitrogen gas halfway from a second pressure control valve 15 of the connection pipe 13 to a circulation flow control valve 14, and halfway from the valve 14 to a gas heater 2. Further, a bypass pipe 16 connecting the pipe 10 and the diffusion port side of a first pressure control valve 12 is provided, and a check valve 17 is also provided to the bypass pipe 16. |
