Method for detecting abnormity of remaining oxygen in thermal treatment furnace
The technology of a heat treatment furnace and a detection method is applied in the detection of abnormal residual oxygen content in the heat treatment furnace, and in the field of manual detection of abnormal residual oxygen content in the heat treatment furnace without oxidation of heat radiation tube, which can solve the problem of long online residual oxygen repair cycle. and other problems, to achieve the effect of improving surface quality, strong operability, and simple and clear method
Active Publication Date: 2015-02-25
SHOUGANG CORPORATION
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However, the recovery period of online residual oxygen is long, and an offline monitoring method is urgently needed in case of instrument damage
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[0010] a) Divide the radiant tube non-oxidation roller hearth heat treatment furnace into 5 detection areas, specifically measuring point 1 at the furnace head, measuring point 2 in the furnace, measuring point 3 in the furnace, measuring point 4 in the furnace, and measuring point at the end of the furnace 5;
[0011] b) Measure the oxygen content in the furnace at the five monitoring ports above the heat treatment furnace with a hand-held residual oxygen meter. The residual oxygen content in the five zones in the furnace is shown in Table 1:
[0012] Table 1 Determination table of residual oxygen content in heat treatment furnace
[0013]
[0014] c) It can be seen from Table 1 that the oxygen content in the measuring point 4 in the furnace exceeds the standard, and the burner in the detection point 4 is discarded and analyzed. The burner discarded analysis results are shown in Table 2:
[0015] Table 2 Determination table of residual oxygen content in heat treatment fur...
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The invention discloses a method for detecting abnormity of remaining oxygen in a thermal treatment furnace, belonging to the technical field of heat treatment of plates with moderate thickness. The method for detecting abnormity of the remaining oxygen in the thermal treatment furnace comprises the following steps of: dividing the thermal treatment furnace into 5-6 detection regions based on a practical condition; measuring oxygen content in the furnace at a monitoring port of the thermal treatment furnace by using a handheld remaining oxygen instrument; considering that the oxygen content exceeds the standard if the oxygen content is greater than 1800 ppm; performing nozzle discarding analysis in an abnormal monitoring region with oxygen content exceeding the standard, wherein the components of an exhaust gas in the nozzle are similar to the components of air under the condition of no consumption, and considering that the remaining oxygen exceeds the standard if the oxygen content in the exhaust gas is lower than 20%; and closing the nozzle with the remaining oxygen exceeding the standard, and recovering during an overhaul period. The method for detecting the abnormality of the remaining oxygen in the thermal treatment furnace has the advantages of being simple and clear, and strong in operability, being able to judge an atmosphere abnormal region in the furnace exactly when an online remaining oxygen instrument loses effectiveness, avoiding oxidization of surface quality of a steel plate caused by the remaining oxygen exceeding the standard in the furnace, and improving surface quality of the thermally treated steel plate.
Description
technical field [0001] The invention belongs to the technical field of heat treatment of medium and thick plates, and in particular relates to a detection method for abnormal residual oxygen content in a heat treatment furnace, and a manual detection method for abnormal residual oxygen content in a thermal radiation tube non-oxidation roller hearth heat treatment furnace. Background technique [0002] In actual production, during the heat treatment process of the steel plate at high temperature (900~940°C), the surface of the hearth roll is easy to stick to the iron oxide scale, and nodules are formed on the surface of the hearth roll. The hardness of the steel plate is low at high temperature. Affected by its own weight, the lower surface of the steel plate is formed by nodules on the lower surface of the steel plate, resulting in the deterioration of the surface quality of the steel plate. One of the main sources of the oxide scale of the thermal radiation tube non-oxidati...
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IPC IPC(8): G01N33/00
Inventor 王雪松刘晓辉熊家祥董占斌张跃飞王立坚闫智平王新周希楠
Owner SHOUGANG CORPORATION