CN-121977711-A - Temperature monitoring method for siliceous refractory bricks

CN121977711ACN 121977711 ACN121977711 ACN 121977711ACN-121977711-A

Abstract

The invention relates to the technical field of temperature monitoring, in particular to a temperature monitoring method for siliceous refractory bricks, which comprises the steps of obtaining heat flux density, determining comprehensive thermal resistance of a repair body and historical thermal resistance of the repair body according to an initial detection period to determine the variation of the thermal resistance of the repair body, determining the bonding state of the repair body and the raw silica bricks at a repair interface based on the variation of the thermal resistance of the repair body, responding to the bonding state, adjusting the initial detection period, obtaining rolling correlation coefficients of the comprehensive thermal resistance of the repair body and the average temperature of the repair surface in a plurality of historical detection periods, determining the correlation of the thermal resistance variation and the thermal load variation, obtaining the maximum stripping width and the actual measured thickness of a repair area to determine the failure risk index of the repair body, and responding to the bonding state and the correlation adjustment variation threshold or correlation coefficient threshold. The invention ensures the overall safety of the masonry by quantifying the combined state of the interface of the siliceous refractory brick repair area and combining with the adaptability monitoring of the deterioration trend.

Inventors

LI SHUANGYAN
ZHANG WEI
ZHANG XING
SU SANG

Assignees

冷水江市中孚新材料有限责任公司

Dates

Publication Date: 20260505
Application Date: 20260408

Claims (10)

1. A method for monitoring the temperature of siliceous refractory bricks comprising: Determining the combination state of the repair body and the raw silica bricks at a repair interface based on the change of the surface thermal resistance of the repair body, wherein the change of the surface thermal resistance of the repair body is determined based on the difference between the comprehensive surface thermal resistance of the repair body and the historical surface thermal resistance of the repair body, and the comprehensive surface thermal resistance of the repair body and the historical surface thermal resistance of the repair body are determined according to an initial detection period based on the heat flux density; Adjusting an initial detection period of the repair area based on the combination state, and determining the correlation between the thermal resistance change and the thermal load change based on rolling correlation coefficients of the comprehensive performance thermal resistance of the repair body and the average temperature of the repair surface in a plurality of historical detection periods; acquiring a thermal resistance change acceleration and a rolling correlation coefficient of the complex comprehensively representing thermal resistance, and predicting whether the complex bonding state has a deterioration risk or not; Obtaining the heat flux density of the repair area and the adjacent heat flux density to determine the local heat load offset ratio so as to determine the heat flux density condition of the repair area and the primary brick area, and adjusting the local heat source intensity corresponding to the repair area or determining the overheat risk of the repair area in response to the heat flux density condition; acquiring equivalent thermal barrier strength to determine that the prosthesis has direct overheat risk, and adjusting an initial detection period or a process temperature set value according to the average temperature of the repair surface; Responding to the heat flux density condition, determining a phase change progress index of the adjacent area based on the correlation of the heat resistance change and the heat load change so as to determine the type of the phase change area where the adjacent area is positioned, and controlling the cooling rate or enhancing the temperature rise control; the maximum peel width and measured thickness of the repair area are obtained to determine a repair failure risk index to determine a failure risk and adjust a change threshold or correlation coefficient threshold in response to the bonding status and correlation.
2. The method for monitoring the temperature of siliceous refractory bricks according to claim 1, wherein the process of determining the bonding state of the repair body and the raw silica bricks at the repair interface comprises; if the absolute value of the thermal resistance change quantity of the surface of the repair body is smaller than or equal to a first change threshold value, judging that the repair area is in a first bonding state, and bonding the repair material and the original silica bricks well; if the thermal resistance change quantity of the restoration body is larger than the first change threshold value and smaller than the second change threshold value, judging that the restoration area is in a second combination state, and adjusting the initial detection period of the restoration material and the original silica bricks; If the absolute value of the thermal resistance change quantity of the surface of the repair body is larger than or equal to the second change threshold value, judging that the repair area is in a third bonding state, and the bonding of the repair material and the original silica bricks is close to failure.
3. The method for monitoring the temperature of siliceous refractory bricks according to claim 2, wherein the repair area is in a second bonding state, and the initial detection period of the repair area is reduced according to the ratio of the amount of change in the surface thermal resistance of the repair area to the first change threshold; Determining a rolling correlation coefficient based on the comprehensive thermal resistance of the restoration body and the average temperature of the restoration surface, and judging that the comprehensive thermal resistance of the restoration body is strongly correlated with the average temperature of the restoration surface if the absolute value of the rolling correlation coefficient is larger than the correlation coefficient threshold value, wherein the comprehensive thermal resistance change of the restoration body is mainly governed by the temperature change; If the absolute value of the rolling correlation coefficient is smaller than or equal to the correlation coefficient threshold, judging that the complex body comprehensively shows weak correlation between the thermal resistance and the average temperature of the repairing surface, wherein the thermal resistance change is not closely related to the current temperature fluctuation.
4. The method for monitoring the temperature of siliceous refractory bricks according to claim 3, wherein the acceleration of thermal resistance change combined with the rolling correlation coefficient of the overall performance thermal resistance of the prosthesis is obtained, and whether the joint state of the prosthesis is at risk of deterioration is predicted; If the complex comprehensively shows that the thermal resistance is strongly related to the average temperature of the repairing surface, and the acceleration of thermal resistance change is smaller than or equal to zero, the complex bonding state is predicted to be stable or to fluctuate along with the temperature period, and the risk of the complex bonding state deterioration is low; If the restoration comprehensively shows weak correlation between the thermal resistance and the average temperature of the restoration surface, and the thermal resistance change acceleration is larger than zero, the combination state of the restoration is predicted to be continuously deteriorated, an early warning signal is sent out, and the early warning level is improved according to the thermal resistance change acceleration.
5. The method for monitoring the temperature of siliceous refractory bricks according to claim 4, wherein a repair area heat flux density and an adjacent heat flux density are obtained, wherein the adjacent heat flux density is a heat flux density of a native silica brick area adjacent to the repair area, and a local heat load offset ratio is calculated; if the local heat load offset ratio is within the offset ratio threshold range, judging that the heat flow density of the repair area is similar to that of the original brick area, and the heat transfer is uniform; If the local heat load offset ratio is lower than the offset ratio threshold range, judging that the heat flow flowing through the repair area is reduced, and adjusting the local heat source intensity corresponding to the repair area, wherein the heat load is unbalanced; if the local heat load offset ratio is higher than the offset ratio threshold range, judging that the heat flow is abnormally concentrated in the repair area, and determining the overheat risk of the repair area.
6. The method of monitoring the temperature of a siliceous refractory brick according to claim 5, wherein determining the risk of overheating in the repair area comprises; if the equivalent heat barrier strength is positive and continuously increases, judging that the repair body has direct risk of burning loss and peeling, and adjusting the initial detection period or the process temperature set value according to the average temperature of the repair surface.
7. A method for monitoring the temperature of a siliceous refractory brick according to claim 6, When the direct risk exists in the restoration body, and the average temperature of the restoration surface is larger than a first temperature threshold value, reducing an initial detection period according to the ratio of the average temperature of the restoration surface to the first temperature threshold value; When the average temperature of the repairing surface is larger than the second temperature threshold value, an alarm is sent out, and the setting value of the furnace temperature of the melting furnace is reduced according to the ratio of the average temperature of the repairing surface to the second temperature threshold value.
8. The method for monitoring the temperature of siliceous refractory bricks according to claim 7, wherein the phase transition progress index of the adjacent region of the repair area is determined when the repair body exhibits a weak correlation between the thermal resistance and the average temperature of the repair surface and the thermal load is unbalanced; If the phase change progress index exceeds the weighted hour range, judging that the thermal load is transferred to a phase change saturation region, wherein the thermal shock resistance is weak, the thermal shock spalling risk exists, and the cooling rate is controlled; If the phase change progress index is lower than the weighted hour range, judging that the heat load is transferred to the phase change initial region, and the risk of abnormal expansion is induced, so that the temperature rise control is enhanced.
9. A method for monitoring the temperature of a siliceous refractory brick according to claim 8, Judging that the failure risk is low when the failure risk index is smaller than a first index threshold; Judging that the failure risk is a medium risk when the failure risk index is larger than or equal to the first index threshold and smaller than the second index threshold; And judging that the failure risk is high risk when the failure risk index is greater than or equal to a second index threshold.
10. A method for monitoring the temperature of a siliceous refractory brick according to claim 9, When the repair area is in the second combination state, if the failure risk is low, the first change threshold value and the second change threshold value are adjusted to be high; And if the failure risk is not low, if the complex of the restoration body shows strong correlation between the thermal resistance and the average temperature of the restoration surface, the correlation coefficient threshold value is reduced.

Description

Temperature monitoring method for siliceous refractory bricks Technical Field The invention relates to the technical field of temperature monitoring, in particular to a temperature monitoring method for siliceous refractory bricks. Background The siliceous refractory brick is made of silicon dioxide) The acid refractory material which is the main component (the content is usually higher than 93%) is widely applied to key parts of high-temperature industrial kilns such as coke ovens, glass melting kilns, hot blast stoves and the like because of higher load softening temperature, excellent acid slag erosion resistance and high-temperature volume stability. These kilns typically operate at temperatures between 1400 ℃ and 1650 ℃ and have a complex furnace atmosphere which may contain acid gases, alkali metal vapors and dust. The accurate, reliable and continuous monitoring of the internal and surface temperature of the siliceous refractory brick is one of the core technologies for guaranteeing the safe, efficient and long-life operation of the kiln. The temperature data is not only a direct basis for process control, but also is key information for evaluating the thermal stress state of the refractory brick, predicting the residual life of the refractory brick and preventing sudden damage (such as peeling and penetration). However, due to the extreme nature of the siliceous refractory brick operating environment and the particularities of the materials themselves, existing temperature monitoring methods have a number of limitations and challenges: The Chinese patent publication No. CN113884195A discloses a device and a method for monitoring the thickness and the temperature of a refractory brick layer, wherein the device for monitoring the thickness of the refractory brick layer comprises a measuring part connected with a furnace body to be monitored, and further comprises a calculating module I, a calculating module II and a calculating module III, the furnace body to be monitored is a gasification furnace, the furnace body to be monitored sequentially comprises a liquid slag layer, a refractory brick layer and a metal wall from inside to outside, the refractory brick layer sequentially comprises a fire surface brick layer, a backing brick layer and a heat insulation brick layer from inside to outside, the calculating module I is used for calculating the thickness of the liquid slag layer through a mass conservation equation in the laminar heat transfer process of the liquid slag layer, the calculating module II is used for calculating the heat flow density penetrating through the metal wall, and the calculating module III is used for obtaining the thicknesses of the fire surface brick layer, the backing brick layer and the heat insulation brick layer. It can be seen that the device and method for monitoring the thickness and temperature of the refractory brick layer have the following problems: failure to quantify the interface bonding state of a refractory siliceous brick repair area and predict it and the overall safety of the masonry is ensured by adaptively regulating and controlling the monitoring parameters of the deterioration trend. Disclosure of Invention Therefore, the invention provides a temperature monitoring method for siliceous refractory bricks, which is used for solving the problems that the interface bonding state of the siliceous refractory brick repair area cannot be quantized and the deterioration trend of the siliceous refractory brick repair area cannot be predicted in the prior art, and the monitoring parameters can be adaptively regulated and controlled. In order to achieve the above object, the present invention provides a temperature monitoring method for siliceous refractory bricks, comprising: Acquiring heat flux density, determining comprehensive thermal resistance of the prosthesis and historical thermal resistance of the prosthesis according to an initial detection period to determine the thermal resistance variation of the prosthesis, and determining the combination state of the prosthesis and the primary silica brick at a repair interface based on the thermal resistance variation of the prosthesis; Responding to the initial detection period of the combined state regulation repair area, acquiring rolling correlation coefficients of the comprehensive performance thermal resistance of the repair body and the average temperature of the repair surface in a plurality of historical detection periods, and determining whether the thermal resistance change is correlated with the thermal load change; acquiring a thermal resistance change acceleration and a rolling correlation coefficient of the complex comprehensively representing thermal resistance, and predicting whether the complex bonding state has a deterioration risk or not; Acquiring the heat flux density of the repair area and the adjacent heat flux density, determining a local heat load offset ratio, determining the heat flux d