GB1283722A - A control apparatus for blast furnace operation - Google Patents

Abstract

1283722 Automatic temperature control system NIPPON KOKAN K K 5 Aug 1969 [8 Aug 1968] 39092/69 Heading G3R A control system for a blast furnace comprises an infrared vidicon camera for scanning a pattern of heat rays radiated from the top of the charge, a monitor of temperature distribution pattern receiving signals from the camera and indicating a pattern of temperature distribution in corresponding colours, and a data processing device storing information of optimum operating requirements relating to various furnace conditions which compares such information with signals from the camera in order to control factors relating to the operation of the furnace. One or two vidicon cameras 23 fixed atop the furnace scan the stock line and develop, appropriate to the temperature distribution, signals which are amplified at 24 and pass through a circuit 25 which removes horizontal synchronization signals, see Fig. 3A (not shown) to a black/white video monitor 27 producing images of the height and the shape of the stock line, also condition of the gas streams, also to signal processing circuits 28, 29. Circuit 28 detects voltage levels and produces a stepped waveform Fig. 3C (not shown) approximately corresponding to the distribution pattern, which may be divided into a series of stepped waves Figs. 3D-H (not shown) which waves may be displayed in colour on a suitable picture tube (42) Fig. 4 (not shown). The stepped wave may also be fed to an analogue digital converter (43) to produce time averaged values which are reconverted into image signals Fig. 3H (not shown) symbolic of the original waveform which may be displayed on another colour tube (47). Circuit 29 transmits the signals to a data processing device 35 including a computer 32 which stores information on optimum operating conditions which are passed to an analyzer 33 which also receive information relating to the furnace bottom from a circuit 36. The outputs from circuits 27, 30, 35 are passed through circuits 38, 39 which control materials fed to the furnace, e.g. coke and ore, the air feed, and any other factors relating to furnace operation. The camera (s) is protected by a plurality of heat-resistant glass filters mounted on a rotatable disc so that the filters can be changed at intervals and those not in use may be cleaned by a gas blast.