Title:
COMBUSTION VIBRATION MONITORING DEVICE FOR FURNACE
Document Type and Number:
Japanese Patent JP3529161
Kind Code:
B2
Abstract:
PURPOSE: To quickly grasp the minute signs of combustion vibration and enable the consideration of countermeasures to be taken before the vibration is amplified by a method wherein the generation of combustion vibration is estimated based on a ratio of the vibration energy of a resonance frequency of the furnace in the frequency of cross power spectrum of flame to a total vibration energy.
CONSTITUTION: The photoelectric conversion of flame in a furnace is effected by a photo sensor and the electric signal is amplified while a voltage signal of the same is converted into a relative optical strength data by an analogue divider 17 and is converted into a digital data through an A/D converter 18. These data are converted into cross-correlation function by a cross-correlation function operator 40 in time area, then, is converted into a cross-power spectrum in a frequency area by a FFT analyzer 5 and, further, an amplitude I1C in a resonance frequency F1 in this area is obtained by a vibration evaluating device 6 through peak search to operate the ratio I1C/I0C of the amplitude I1C to a total vibration energy I0C. The generation of combustion vibration is estimated based on said ratio.
Inventors:
Baba, Akira
Nomura, Shinichiro
Morita, Shigeki
Tsumura, Shunichi
Nakasaki, Hideki
Nomura, Shinichiro
Morita, Shigeki
Tsumura, Shunichi
Nakasaki, Hideki
Application Number:
JP14336994A
Publication Date:
May 24, 2004
Filing Date:
June 24, 1994
Export Citation:
Assignee:
BABCOCK HITACHI KK
International Classes:
F23N5/00; F22B37/38; F22B37/42; F23N5/08; (IPC1-7): F23N5/08; F22B37/38; F23N5/00
Attorney, Agent or Firm:
川北 武長
Previous Patent: METHOD OF CONTROLLING ELECTRIC MELTING FURNACE
Next Patent: INFRARED VISIBLE WAVE LENGTH UPWARD TRANSFORMING MATERIAL
Next Patent: INFRARED VISIBLE WAVE LENGTH UPWARD TRANSFORMING MATERIAL