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Patent Searching and Data


Title:
METHOD FOR CONTROLLING SMOKE CONCENTRATION OF BOILER
Document Type and Number:
Japanese Patent JPH06292839
Kind Code:
A
Abstract:

PURPOSE: To provide the method for controlling the smoke concn. of a boiler which suppresses the smoke concn. without delay and maintains the smoke concn. always at a prescribed value or below when the load of the boiler increases sharply.

CONSTITUTION: This method includes a DC high-voltage power source device 8 for sending the charge quantity of a DC high voltage to an electrostatic precipitator 1 and a dust counter 3 for detecting the smoke dust quantity in the outlet of this electrostatic precipitator 1. The load increase of the boiler equipped with a controller 6a to set and command the charge quantity of the DC high voltage to be supplied to the electrostatic precipitator 1 in the DC high-voltage power source device 8 by processing the smoke concn. signal outputted from the dust counter 3 is detected by a load signal 9s of the boiler and the charge quantity is increased stepwise at the point of the time when the smoke concn. signal 4s exceeds a prescribed value so as to prevent the rapid increase of the smoke concn. The next charge quantity is calculated from the change rate of the charge quantity and the change rate of the smoke concn. after the smoke concn. is rapidly suppressed. The charge quantity is further corrected by the momentary value of the smoke concn. at the point of this time just before the output of the charge quantity, and thereafter, this charge quantity is freshly outputted as the charge quantity.


Inventors:
YASUMURA NAOKI
Application Number:
JP1993000084421
Publication Date:
October 21, 1994
Filing Date:
April 12, 1993
Export Citation:
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Assignee:
MITSUBISHI HEAVY IND LTD
International Classes:
B03C3/68; (IPC1-7): B03C3/68
Attorney, Agent or Firm:
坂間 暁 (外1名)