G - Physics – 01 – L
Patent
G - Physics
01
L
340/145, 341/39
G01L 19/12 (2006.01) F23M 11/04 (2006.01) F23N 5/00 (2006.01)
Patent
CA 1205544
ABSTRACT OF THE DISCLOSURE The invention is concerned with a method for monitoring furnace installations, comprising the steps of (a) passing a flow of gas through a heat-exchange zone where heat is removed from the flow of gas and the tempera- ture thereof is reduced to between 200 and 300°C, (b) measuring the oxygen partial pressure in the flow of waste- gas at the reduced temperature by using a sensing device which responds to the oxygen partial pressure in the waste- gas and which produces an output-signal as a function of the oxygen partial pressure, (c) detecting an abrupt change in the sensing-device output-signal occurring at the transi- tion from super-stoichiometric to sub-stoichiometric com- bustion, and vice-versa, and (d) producing at least one switching and/or warning signal as a function of the abrupt change in the output-signal from the sensing device, the switching or warning signal serving to actuate a shut-off element or alarm. The method of the invention permits simple safety-monitoring of jacketed radiant-heat tubes and recupera- tor-burners, by means of a sensing device responding to the oxygen partial pressure in the waste-gas. Unsatisfactory combustion-conditions, flame-outs with the gas-supply open, leaks in closed gas solenoid-valves and damages, e.g. cracks in the jacket of the radiant-heat tube, are all reliably detected and switching signals for shutting off the media- supplies and returns of the jacketed radiant-heat tube, or for releasing a warning, are produced.
423386
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
Ruhrgas Aktiengesellschaft
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