Three-dimensional unstable state monitoring and abnormity diagnosis and maintenance system of blast furnace hearth

Abstract

The invention relates to a three-dimensional unstable state monitoring and abnormity diagnosis and maintenance system of a blast furnace hearth, belonging to the technical field of online monitoring, diagnosis, prewarning and maintenance of the blast furnace. The three-dimensional unstable state monitoring and abnormity diagnosis and maintenance system of the blast furnace hearth comprises a data acquisition module, a data filtering module, a hearth and furnace bottom corrosion and accretion calculation module, an abnormality diagnosis module, a prewarning displaying module and a hearth-guiding and maintaining module. Water temperature of a cooling wall of the hearth and galvanic couple temperature of a furnace body can be collected and filtered in real time; by combining the two data together and using pro and con questions of the heat transmission science in combination with the standard of abnormity diagnosis, the influence of the abnormity possibly occurring in the production of the thermal conductivity coefficient variation of refractories, the ring shake, the air gap, and the like on distribution and corrosion of a temperature field is comprehensively judged, a gradient-regularization method and a chaos optimization method are combined to solve, the online monitoring on the three-dimensional unstable state temperature field of the hearth and the furnace bottom, the internal corrosion type, the slag-metal skull variation and the hot state of the hearth is realized, the abnormal circumstance and the corrosion deterioration causes are diagnosed in real time, and the hearth maintenance means is pertinently guided according to the corrosion deterioration causes. The system is successfully applied to industry.

Description

technical field [0001] The invention belongs to the technical field of on-line monitoring, diagnosis, early warning and maintenance of the blast furnace hearth bottom, and in particular provides a three-dimensional unsteady state monitoring and abnormal diagnosis and maintenance system of the blast furnace hearth, how to collect and filter the cooling water temperature of the blast furnace hearth in real time and the temperature of the thermocouple in the brick lining of the furnace body, how to conduct online monitoring and early warning of the three-dimensional unsteady temperature field of the hearth and furnace bottom, the erosion inner shape, and the change of the slag-iron shell based on these two basic data, and for ring cracks, air gaps, A method and industrial application system for diagnosing the abnormalities such as cross gas and the reasons for the aggravated corrosion of the hearth bottom, and taking targeted measures to effectively maintain the hearth according t...

AI Technical Summary

Problems solved by technology

[0004] (1) There are problems in the selection of basic data in the existing hearth monitoring methods or systems: they all collect the water temperature difference of the hearth cooling wall or the temperature of the thermocouple in the brick lining alone to judge the working state of the hearth, but rely solely on the hearth When judging the hearth erosion by using the heat flow of water temperature difference in the stave, the heat flow of the stave can only reflect the average erosion degree of the brick lining in front of the whole stave, and the hearth burn-through is often point burn-through rather than surface burn-through; relying on bricks alone When the lining thermocouple temperature is used to judge the hearth erosion, due to the limited number of thermocouples, the places without thermocouples will lose the basis for erosion judgment, and at the end of the furnace service (the blast furnace hearth needs to be monitored), the thermocouples in the brick lining are often already More damage, so the accuracy of erosion monitoring will be greatly reduced due to insufficient basic data

[0005] (2) The existing hearth monitoring methods or systems have problems in basic data collection: most of the collected data are directly used for hearth working state diagnosis, and there is a lack of filtering of erroneous data, such as basic data errors will directly lead to wrong judgment results and may undermine the accuracy of continuous monitoring

In addition, most of the traditional multi-module circuit analog signal transmission is used in the collection of cooling water temperature, the data accumulation error is large and the transmission process is susceptible to interference

[0006] (3) There are problems in the calculation model selection of existing hearth monitoring methods or systems when inferring hearth erosion: most of them use one-dimensional or two-dimensional, rectangular coordinates (rectangular), and steady-state calculation models that do not include the latent heat of solidification of molten iron. The three-dimensional design and erosion asymmetry of the hearth bottom of the blast furnace, the geometric shape is approximately cylindrical, and the slag-iron shell forms and releases the solidification latent heat.

[0007] (4) There is a gap in the existing hearth monitoring method or system when judging whether there is an abnormality in the hearth: through the research on the erosion mechanism of the hearth hearth bottom and the erosion monitoring and damage investigation of dozens of blast furnaces in China (the applicant of this patent has long been committed to Blast furnace longevity technology and erosion monitoring research, undertook and completed the national "Eighth Five-Year Plan", "Ninth Five-Year Plan", "Eleventh Five-Year Plan", Natural Science Foundation projects and Shougang, Taiyuan Iron and Steel, Tangshan Iron and Steel, Panzhihua Iron and Steel Co., Ltd. and many factory association projects), we found that after the blast furnace was put into production, with the gradual temperature rise of the refractory material at the bottom of the hearth, tapping operation, corrosion of zinc and alkali metals, thermal stress changes, and the removal of moisture and volatiles in the filling and ramming materials, the hearth The reasons for the obvious change in the working state of the furnace bottom and the intensification of erosion are often due to the occurrence of abnormal conditions, such as ring cracks in the hearth carbon bricks, air gaps between carbon bricks and the cooling system, gas flow, abnormal changes in the thermal conductivity of refractory materials, and furnace bottom seepage. Iron, etc., but the existing erosion monitoring methods or systems have not judged and warned these abnormal situations

[0008] (5) The existing hearth monitoring methods or systems have problems in the display and early warning function: most of them only display a single hearth bottom erosion line, and lack the display of different temperatures at various parts of the hearth bottom; When the system is in an unresponsive state, it does not support man-machine dialogue; when performing historical query on the state of the hearth, it can only provide data query and lacks an intuitive query display of the inner shape of the hearth erosion; , hearth is not active and other real-time early warning prompt function

[0009] (6) There is a gap in the existing hearth monitoring methods or systems in guiding hearth maintenance: most of them can only make judgments on the severity of hearth erosion or the remaining thickness of brick lining, but fail to diagnose the cause of increased erosion , it is impossible to guide targeted hearth maintenance and production operation adjustment

[0010] In summary, the existing hearth bottom monitoring and early warning methods or systems still have defects in basic data selection, erosion calculation model selection, and early warning prompts for hearth working status. There is still a gap in cylinder maintenance, which has not been organically combined with the safe and efficient production of blast furnaces

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