CN114292973A - Method for estimating and monitoring temperature of refractory material in blast furnace lining - Google Patents
Method for estimating and monitoring temperature of refractory material in blast furnace lining Download PDFInfo
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- 239000011819 refractory material Substances 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000012544 monitoring process Methods 0.000 title claims abstract description 20
- 238000003466 welding Methods 0.000 claims abstract description 9
- 230000003628 erosive effect Effects 0.000 description 6
- 230000008569 process Effects 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000009529 body temperature measurement Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000009851 ferrous metallurgy Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
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Abstract
The application provides a method for estimating and monitoring the temperature of a refractory material in a blast furnace lining, which comprises the steps of searching a region with higher temperature on the outer surface of a furnace shell of a blast furnace, and welding a thermal resistance temperature measuring device; then calculating the temperature difference delta T between the pre-embedded thermocouple and the measured temperature of the thermal resistance temperature measuring device; then calculating the linear distance L between the thermocouple and the temperature measuring point of the thermal resistance temperature measuring device0Then, the thermal conductivity λ of the refractory material is obtained according to the formula Q ═ λ × Δ T/L0Calculating the heat flow intensity Q; reversely estimating the temperature T of the refractory material of the furnace lining at different linear distances L from the temperature measuring point of the thermal resistance temperature measuring device according to the heat flow intensity Q, wherein the T is (Q multiplied by L/lambda) + T1; utilize thermal resistance temperature measuring device to monitor and the early warning directly perceivedly to the region of the stove outer covering high temperature, can also estimate, monitor and the early warning to the refractory material temperature of the different degree of depth in the furnace wall through heat conduction model, avoided furnace hearth and stoveBottom burning through and other major accidents.
Description
Technical Field
The invention relates to the technical field of ferrous metallurgy, in particular to a method for estimating and monitoring the temperature of a refractory material in a blast furnace lining.
Background
The realization of high efficiency and long service life of blast furnace production is always an important subject of blast furnace ironmaking, and the prolonging of the service life of the blast furnace can save overhaul cost and reduce yield loss during overhaul. The life of a blast furnace is affected by many factors, such as the design of the furnace type, the quality of the refractory, etc., but all of these factors have already been set before the blast furnace is put into operation. After the blast furnace is put into operation, the hearth and the bottom of the blast furnace are important factors influencing the service life of the blast furnace, because the working conditions of the hearth and the bottom of the blast furnace are particularly severe in the smelting process of the blast furnace, the erosion and damage speed of the hearth and the bottom of the blast furnace is very rapid, the hearth and the bottom of the blast furnace cannot be repaired in the production process like other parts of the blast furnace, and the service life of the blast furnace is mainly determined by the erosion condition of refractory materials of the hearth and the bottom of the blast furnace. Therefore, the erosion condition of the hearth and the bottom of the blast furnace can be known and controlled in time, and serious accidents such as serious erosion or burnthrough can be avoided, which is the most important factor in blast furnace ironmaking.
The traditional thermocouple temperature measuring sensor is built in the refractory material of the furnace lining of the blast furnace and cannot be replaced once being damaged due to the influence of mechanical deformation or self quality and other problems, so that the real-time actual temperature of the refractory material in the furnace lining cannot be obtained, and the blast furnace cannot be monitored in full time, real time and all-round mode.
Therefore, how to estimate the temperature of the refractory material without the thermocouple temperature measuring sensor by using the temperature data measured by the existing thermocouple temperature measuring sensor which can normally work and the temperature of the refractory material which is installed before but the thermocouple temperature measuring sensor is damaged, the erosion condition of the hearth and the bottom of the blast furnace can be known and controlled in time, and serious accidents such as serious erosion or burnthrough can be avoided, and the technical problem which needs to be solved by technical personnel in the field is urgently needed.
Disclosure of Invention
The invention aims to provide a method for estimating and monitoring the temperature of a refractory material in a blast furnace lining.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a method for estimating and monitoring the temperature of a refractory material in a blast furnace lining comprises the following steps in sequence:
1) searching a region with higher temperature on the outer surface of the furnace shell of the blast furnace, welding a thermal resistance temperature measuring device on the region with higher temperature on the outer surface of the furnace shell, and transmitting an electric signal output by the thermal resistance temperature measuring device to a PLC system;
2) acquiring the measured temperature of a thermocouple pre-embedded in a blast furnace lining, and calculating the temperature difference delta T between the measured temperature of the pre-embedded thermocouple and the measured temperature of a thermal resistance temperature measuring device welded at the later stage;
acquiring the embedded position and length of a thermocouple embedded in a furnace lining according to a blast furnace masonry drawing, and calculating the linear distance L between the temperature measuring point of the thermocouple and the temperature measuring point of a thermal resistance temperature measuring device0；
3) Obtaining the heat conductivity coefficient lambda of the refractory material of the blast furnace lining through inquiry, and then calculating the formula Q ═ lambda multiplied by delta T/L according to the heat conductivity of the object0Calculating the heat flow intensity Q of the part;
4) and (3) reversely estimating the temperature T of the lining refractory material at different linear distances L from the temperature measuring point of the thermal resistance temperature measuring device through the calculated heat flow intensity Q, wherein T is (QxL/lambda) + T1, and T1 is the temperature measured by the thermal resistance temperature measuring device.
Preferably, at least three thermal resistance temperature measuring devices are welded on the outer surface of the furnace shell in a region with higher temperature, the at least three thermal resistance temperature measuring devices surround the embedded thermocouple, the heat flow intensity Q between the embedded thermocouple and each thermal resistance temperature measuring device is calculated, then the whole heat flow intensity is averaged, and the average value Q of the heat flow intensity is obtainedAverage；
Then passing through the calculated heat flow intensity average value QAverageAnd reversely estimating the temperature T of the furnace lining refractory material at different linear distances L from the temperature measuring point of the thermal resistance temperature measuring device, wherein the T is (Q)Average×L/λ)+T1。
Preferably, the refractory materials with different linear distances L from the temperature measuring point of the thermal resistance temperature measuring device and the refractory materials at the pre-embedded position of the thermocouple are the same refractory materials.
Preferably, the refractory material of which the temperature is estimated is the refractory material of the hearth and the hearth.
Preferably, the thermocouple is a sheathed thermocouple of 8K type diameter.
Preferably, the thermal resistance temperature measuring device is a PT100 thermal resistance temperature measuring device with a welding block.
The application provides a method for estimating and monitoring the temperature of a refractory material in a blast furnace lining, which uses an infrared thermal imager to search a region with higher temperature on the outer surface of a furnace shell of a blast furnaceWelding the thermal resistance temperature measuring device, and transmitting an electric signal output by the thermal resistance temperature measuring device to the PLC system; then calculating the temperature difference delta T between the measured temperature of the pre-embedded thermocouple and the measured temperature of the later-period welded thermal resistance temperature measuring device; then obtaining the pre-embedded position and length of the thermocouple pre-embedded in the furnace lining according to the blast furnace masonry drawing, and calculating the linear distance L between the temperature measuring point of the thermocouple and the temperature measuring point of the thermal resistance temperature measuring device0Then obtaining the heat conductivity coefficient lambda of the refractory material of the blast furnace lining through inquiry, and then calculating the formula Q ═ lambda multiplied by delta T/L according to the heat conductivity of the object0Calculating the heat flow intensity Q of the part; reversely estimating the temperature T of the lining refractory material at different linear distances L from the temperature measuring point of the thermal resistance temperature measuring device through the calculated heat flow intensity Q, wherein the T is (Q multiplied by L/lambda) + T1;
the estimation monitoring method not only can visually monitor and early warn the areas with higher temperature on the furnace shell by utilizing the thermal resistance temperature measuring device additionally installed in the later welding, but also can estimate, monitor and early warn the refractory material temperatures of different depths in all directions in the blast furnace lining through the heat conduction model, thereby realizing the omnibearing monitoring and early warning of the blast furnace and avoiding serious accidents such as burning-through of the furnace cylinder and the furnace bottom.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The application provides a method for estimating and monitoring the temperature of a refractory material in a blast furnace lining, which comprises the following steps of:
1) searching a region with higher temperature on the outer surface of the furnace shell of the blast furnace, welding a thermal resistance temperature measuring device on the region with higher temperature on the outer surface of the furnace shell, and transmitting an electric signal output by the thermal resistance temperature measuring device to a PLC system;
2) acquiring the measured temperature of a thermocouple pre-embedded in a blast furnace lining, and calculating the temperature difference delta T between the measured temperature of the pre-embedded thermocouple and the measured temperature of a thermal resistance temperature measuring device welded at the later stage;
acquiring the embedded position and length of a thermocouple embedded in a furnace lining according to a blast furnace masonry drawing, and calculating the linear distance L between the temperature measuring point of the thermocouple and the temperature measuring point of a thermal resistance temperature measuring device0；
3) Obtaining the heat conductivity coefficient lambda of the refractory material of the blast furnace lining through inquiry, and then calculating the formula Q ═ lambda multiplied by delta T/L according to the heat conductivity of the object0Calculating the heat flow intensity Q of the part;
4) and (3) reversely estimating the temperature T of the lining refractory material at different linear distances L from the temperature measuring point of the thermal resistance temperature measuring device through the calculated heat flow intensity Q, wherein T is (QxL/lambda) + T1, and T1 is the temperature measured by the thermal resistance temperature measuring device.
In one embodiment of the application, at least three thermal resistance temperature measuring devices are welded on the higher-temperature area on the outer surface of the furnace shell, the at least three thermal resistance temperature measuring devices surround the embedded thermocouple, the heat flow intensity Q between the embedded thermocouple and each thermal resistance temperature measuring device is calculated, then the whole heat flow intensity is averaged, and the average value Q of the heat flow intensity is obtainedAverage；
Then passing through the calculated heat flow intensity average value QAverageAnd reversely estimating the temperature T of the furnace lining refractory material at different linear distances L from the temperature measuring point of the thermal resistance temperature measuring device, wherein the T is (Q)Average×L/λ)+T1。
In one embodiment of the application, the refractory materials with different linear distances L from the temperature measuring point of the thermal resistance temperature measuring device and the refractory materials at the pre-embedded position of the thermocouple are the same refractory materials.
In one embodiment of the present application, the refractory material whose temperature is estimated is the refractory material of the hearth and the bottom of the furnace.
In one embodiment of the present application, the thermocouple is a sheathed thermocouple of type 8K diameter.
In one embodiment of the present application, the thermal resistance temperature measurement device is a PT100 thermal resistance temperature measurement device with a solder bump.
In ferrous metallurgy, the temperature on the outer surface of the furnace shell of a blast furnace is monitored in a patrol mode at ordinary times, and after an infrared thermal imaging instrument is used for finding an area with higher temperature on the outer surface of the furnace shell of the blast furnace, the fact that the temperature of a furnace lining corresponding to the area with higher temperature is higher, the furnace lining is corroded seriously and is corroded more seriously than the furnace lining at other parts, the thickness of the furnace lining is corroded and thinned seriously, and the furnace lining is a weaker part in the furnace lining of the blast furnace is shown, so before stopping overhaul of the furnace, the furnace lining with higher temperature and serious corrosion needs to be focused and monitored, the corrosion speed and degree of the furnace lining are monitored, and the probability and time of serious accidents such as burnthrough are predicted. Therefore, the method for estimating and monitoring the temperature of the refractory material in the blast furnace lining is a simple and easy method for estimating and monitoring, and is a method for monitoring the remedy after the problem occurs by utilizing the existing conditions; and because the thickness of the steel furnace shell is smaller than the thickness of the refractory material of the furnace lining, the heat conduction process and the heat conduction coefficient of the steel furnace shell of the blast furnace can be ignored in the application, and the heat conduction process and the heat conduction coefficient of the steel furnace shell are included and ignored in the estimation process.
The temperatures in this application are both degrees celsius.
Methods and devices not described in detail in the present invention are all the prior art and are not described in detail.
For further understanding of the present invention, the method for estimating and monitoring the temperature of a refractory material in a furnace lining of a blast furnace according to the present invention will be described in detail with reference to the following examples, and the scope of the present invention is not limited by the following examples.
Example 1
Example 1 provides a method of estimating and monitoring the temperature of a refractory material in a blast furnace lining, comprising the following sequential steps:
1) searching a region with higher temperature on the outer surface of a furnace shell of the blast furnace by using an infrared thermal imager, welding a thermal resistance temperature measuring device on the region with higher temperature on the outer surface of the furnace shell, and transmitting an electric signal output by the thermal resistance temperature measuring device to a PLC system;
2) obtaining the measured temperature of a thermocouple pre-embedded in a blast furnace lining, and calculating the temperature difference delta T between the measured temperature of the pre-embedded thermocouple and the measured temperature of a thermal resistance temperature measuring device welded at the later stage to be 200 ℃;
acquiring the embedded position and length of a thermocouple embedded in a furnace lining according to a blast furnace masonry drawing, and calculating the linear distance L between the temperature measuring point of the thermocouple and the temperature measuring point of a thermal resistance temperature measuring device0＝0.42m；
3) Obtaining the heat conductivity coefficient lambda of the refractory material of the blast furnace lining as 2.0W/(m.K) through inquiry, and then calculating the formula Q as lambda multiplied by delta T/L according to the heat conductivity of the object0The heat flux Q at this position is calculated to be 952W/m2；
4) And reversely estimating the temperature T of the lining refractory material with the different linear distance L of 0.3m from the temperature measuring point of the thermal resistance temperature measuring device through the calculated heat flow intensity Q, wherein the T is 212.8 ℃.
Example 2
Embodiment 2 provides a method for estimating and monitoring the temperature of a refractory material in a lining of a blast furnace, which includes welding at least three thermal resistance temperature measuring devices on an outer surface of a furnace shell in a region with a higher temperature, surrounding an embedded thermocouple by the at least three thermal resistance temperature measuring devices, calculating the heat flow intensity between the embedded thermocouple and each thermal resistance temperature measuring device, averaging all the heat flow intensities to obtain a heat flow intensity average value QAverage＝920W/m2；
Then passing through the calculated heat flow intensity average value QAverageAnd reversely estimating the temperature T of the furnace lining refractory material with the different linear distance L of 0.3m from the temperature measuring point of the thermal resistance temperature measuring device, wherein the T is 208 ℃.
Example 3
Example 3A method for estimating and monitoring the temperature of a refractory material in the lining of a blast furnace in the shell of the furnaceThe area with higher temperature on the outer surface is welded with at least three thermal resistance temperature measuring devices, the at least three thermal resistance temperature measuring devices surround the embedded thermocouple, the heat flow intensity between the embedded thermocouple and each thermal resistance temperature measuring device is calculated, then the whole heat flow intensity is averaged, and the heat flow intensity average value Q is obtainedAverage＝920W/m2；
Then passing through the calculated heat flow intensity average value QAverageReversely estimating the temperature T of the furnace lining refractory material with the different linear distance L being 0.3m from the temperature measuring point of the thermal resistance temperature measuring device, wherein the T is 208 ℃;
the refractory materials of the furnace lining at different linear distances L from the temperature measuring point of the thermal resistance temperature measuring device and the refractory materials at the embedded position of the thermocouple are the same refractory materials;
the refractory materials with the estimated temperature are the refractory materials of the hearth and the furnace bottom;
the thermocouple is a sheathed thermocouple with the diameter phi 8K;
the thermal resistance temperature measuring device is a PT100 thermal resistance temperature measuring device with a welding block.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (6)
1. A method for estimating and monitoring the temperature of a refractory material in a blast furnace lining, characterized by comprising the following steps performed in sequence:
1) searching a region with higher temperature on the outer surface of the furnace shell of the blast furnace, welding a thermal resistance temperature measuring device on the region with higher temperature on the outer surface of the furnace shell, and transmitting an electric signal output by the thermal resistance temperature measuring device to a PLC system;
2) acquiring the measured temperature of a thermocouple pre-embedded in a blast furnace lining, and calculating the temperature difference delta T between the measured temperature of the pre-embedded thermocouple and the measured temperature of a thermal resistance temperature measuring device welded at the later stage;
acquiring the embedded position and length of a thermocouple embedded in a furnace lining according to a blast furnace masonry drawing, and calculating the linear distance L between the temperature measuring point of the thermocouple and the temperature measuring point of a thermal resistance temperature measuring device0；
3) Obtaining the heat conductivity coefficient lambda of the refractory material of the blast furnace lining through inquiry, and then calculating the formula Q ═ lambda multiplied by delta T/L according to the heat conductivity of the object0Calculating the heat flow intensity Q of the part;
4) and (3) reversely estimating the temperature T of the lining refractory material at different linear distances L from the temperature measuring point of the thermal resistance temperature measuring device through the calculated heat flow intensity Q, wherein T is (QxL/lambda) + T1, and T1 is the temperature measured by the thermal resistance temperature measuring device.
2. The method as claimed in claim 1, wherein the at least three temperature measuring devices are welded to the outer surface of the furnace shell in a region with a higher temperature, the at least three temperature measuring devices surround an embedded thermocouple, the heat flow intensity Q between the embedded thermocouple and each temperature measuring device is calculated, and then the heat flow intensities are averaged to obtain the average value QAverage；
Then passing through the calculated heat flow intensity average value QAverageAnd reversely estimating the temperature T of the furnace lining refractory material at different linear distances L from the temperature measuring point of the thermal resistance temperature measuring device, wherein the T is (Q)Average×L/λ)+T1。
3. The method for estimating and monitoring the temperature of the refractory material in the lining of the blast furnace according to claim 1, wherein the refractory material at different linear distances L from the temperature measuring point of the thermal resistance temperature measuring device and the refractory material at the position where the thermocouple is embedded are the same refractory material.
4. The method according to claim 1, wherein the refractory material of which the temperature is estimated is refractory material of a hearth and a bottom of the furnace.
5. The method for estimating and monitoring the temperature of a refractory material in a blast furnace lining according to claim 1, wherein the thermocouple is a sheathed thermocouple of type Φ 8K in diameter.
6. The method of claim 1, wherein the temperature measuring device is a PT100 thermal resistance temperature measuring device with a welded block.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111595901A (en) * | 2020-06-10 | 2020-08-28 | 北京科技大学 | Device and method for measuring heat conductivity coefficient of refractory material |
| CN111854668A (en) * | 2020-08-25 | 2020-10-30 | 中冶赛迪工程技术股份有限公司 | Blast furnace lining thickness calculation device and method based on distributed optical fiber temperature measurement |
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- 2021-12-17 CN CN202111555761.XA patent/CN114292973A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111595901A (en) * | 2020-06-10 | 2020-08-28 | 北京科技大学 | Device and method for measuring heat conductivity coefficient of refractory material |
| CN111854668A (en) * | 2020-08-25 | 2020-10-30 | 中冶赛迪工程技术股份有限公司 | Blast furnace lining thickness calculation device and method based on distributed optical fiber temperature measurement |
Non-Patent Citations (1)
| Title |
|---|
| 周莉英等: "马钢新1号高炉炉缸侵蚀模型的在线应用", 《冶金自动化》 * |
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