CN108570524B - Detection and diagnosis process for refractory material of blast furnace hot blast stove pipeline lining - Google Patents
Detection and diagnosis process for refractory material of blast furnace hot blast stove pipeline lining Download PDFInfo
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- CN108570524B CN108570524B CN201710133655.XA CN201710133655A CN108570524B CN 108570524 B CN108570524 B CN 108570524B CN 201710133655 A CN201710133655 A CN 201710133655A CN 108570524 B CN108570524 B CN 108570524B
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- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B9/00—Stoves for heating the blast in blast furnaces
- C21B9/10—Other details, e.g. blast mains
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Abstract
The invention relates to a detection and diagnosis process for a lining refractory material of a pipeline of a hot blast stove of a blast furnace, which comprises the steps of firstly carrying out infrared imaging on the pipeline of the hot blast stove and carrying out temperature field detection; then, the blast furnace damping machine is used for carrying out open hole exploration detection on the hot air pipeline; analyzing and diagnosing the sedimentation amount again; then processing the sedimentation amount; and finally, plugging the detection hole. The hot air pipeline is prevented from being burnt through and the blast furnace does not have planned damping down due to the fact that the operation state of refractory materials in the hot air furnace pipeline is not clear and the refractory materials are not timely and effectively maintained. And simultaneously, the effect of improving the stability of the running state of the hot blast stove is also achieved.
Description
Technical Field
The invention belongs to the technical field of production processes of blast furnace hot blast stoves, and relates to a detection and diagnosis process for a refractory material of a pipeline lining of a blast furnace hot blast stove.
Background
At present, the structure of the blast furnace hot blast stove pipeline is basically similar, and the blast furnace hot blast stove pipeline consists of heavy working layer refractory bricks, high-alumina heat-insulating bricks, clay heat-insulating bricks, refractory fiber boards (blankets), spray coating and a steel shell from inside to outside. Because the refractory fiber board at the bottom of the lower half ring is compressed and shrunk, or the refractory bricks at the heavy working layer of the upper half ring cannot meet the requirements due to refractoriness under load, low creep index and the like, after long-time production and operation, different degrees of settlement can occur below the tube shell and the spray coating. Once the heavy working layer refractory brick has problems due to construction quality, gaps can be caused, hot air in the hot air pipeline is blown out from the gaps, high-alumina heat-insulating bricks, clay heat-insulating bricks and refractory fiber blankets are burnt to different degrees, the settlement of the refractory material of the lower lining of the steel shell is increased finally, the surface temperature of the steel shell is increased, if the situation is found out not to be timely, the hot air pipeline is burnt through, and the blast furnace has to be subjected to planned damping-down treatment.
The settlement condition of refractory materials in a hot air pipeline is not detected and diagnosed reliably, so that visual data cannot be provided for blast furnace and hot air furnace managers, the blind grouting treatment can be roughly described or carried out only by using a detection temperature result of an infrared temperature measuring gun, and the method is far away from the current fine management requirement of speaking by using data.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a detection and diagnosis process for a lining refractory material of a pipeline of a blast furnace hot blast stove, which is characterized in that a blast furnace is holed, detected and diagnosed when the blast furnace is stopped for 10-12 hours; the method is simple and convenient to operate and low in cost, and can realize accurate exploration on the settlement amount of the hot air pipeline lining refractory material, diagnose the actual running state of the refractory material in the hot air furnace pipeline, provide corresponding maintenance suggestions and avoid sudden accidents.
The technical scheme adopted by the invention for solving the technical problems is as follows: a detection and diagnosis process for refractory material of a blast furnace hot blast stove pipeline lining comprises the following process steps:
the first step is as follows: carrying out infrared imaging on a pipeline of a hot blast stove, detecting a temperature field, detecting the upper part of the hot blast pipeline to be detected by using an infrared imager under the normal air supply state of the blast furnace, and taking a high-temperature part in imaging as a subsequent opening exploration detection target;
secondly, utilizing the chance of damping down a blast furnace to carry out open pore exploration detection on the hot air pipeline, wherein in order to reduce the influence on the steel shell, the infrared imaging detection temperature is less than 200 ℃, the temperature difference of different parts in the length direction of the pipeline is less than 10 ℃, the open pore distance can be properly elongated, the infrared imaging temperature is more than 250 ℃, and holes must be formed below the infrared imaging temperature, the method can be specifically divided into ① steel shell open pores, the opening equipment comprises a steel plate drilling machine, the diameter of which is 20-30 mm, if the steel plate drilling machine does not exist, an acetylene gun and the like can be used for cutting the pores, the diameter of which is 20-30 mm, ② a spray coating layer is punched by an air pick, the refractory materials below the spray coating layer are a refractory fiber blanket and a refractory brick, ③ a steel measuring scale or an iron rod which can not deform is inserted into the pores, the numerical value is directly read from the scale or marked on the iron rod, ④ settlement quantity is determined, namely the settlement quantity of the refractory material is obtained by subtracting the thickness of the steel shell thickness and the spray coating material thickness from the size marked by the scale mark, or the steel;
the third step: analyzing and diagnosing the settlement, wherein the bottom of the lower half circle of the pipeline is provided with the refractory fiber board, and if the settlement is slightly larger than the thickness of the refractory fiber board (less than or equal to 20 mm), the refractory brick of the pipeline has good comprehensive indexes such as masonry quality, refractoriness under load, low creep index and the like; if the lower part of the pipeline is not provided with the refractory fiber board, the sedimentation amount is the comprehensive embodiment of the masonry quality, the refractoriness under load, the low creep index and the like of the refractory brick of the pipeline, if the temperature of the original steel shell below the opening is more than 250 ℃, the refractory fiber blanket after the opening does not exist, the sedimentation amount is more than 100mm, and the sedimentation amount is expanded into a skylight to be inspected, wherein the skylight is included, the skylight is inspected, the skylight comprises the burning loss condition of the clay heat-insulating brick and the high-alumina heat-insulating brick and the crack condition of the refractory brick of the heavy working layer, and the state of the refractory brick of the heavy working layer is only cracked but not locally collapsed because the hot air temperature in the hot air pipeline is usually more than 1000 ℃;
the fourth step: the settlement treatment suggests that the settlement is less than 100mm, and grouting can be considered to fill the settlement space. The settlement is more than 100mm, usually because the heavy working layer firebrick has cracks, blow-by gas burns and loses, need to use ceramic fiber to stop up the gap first, then use the heavy material to carry on the pouring joint filling to the gap, then carry on the mud jacking and pack;
the fifth step: plugging the detection hole, filling the detection hole which is not planned for grouting or pouring, filling the detection hole with ceramic fibers, filling the detection hole with clay plastic, and welding the steel shell back; and for the preparation of pouring treatment, welding the steel shell back after the pouring treatment is finished, and after welding, advising to weld reinforcing ribs on the weld joint and carrying out ultrasonic flaw detection to prevent the weld joint from cracking after air supply is resumed.
The hot air pipeline in the first step comprises a hot air surrounding pipe, a hot air main pipe and a hot air branch pipe.
In order to prevent the casting material from flowing uncontrollably into other directions of the pipe in the fourth step, the area around the casting material is filled with ceramic fibers before casting.
The operation involves high temperature, and the labor protection articles should be worn before the operation to prevent scald.
The invention has the beneficial effects that: at present, the sedimentation phenomenon of the lining refractory material of the blast furnace hot air pipeline is more and more, and most of the hot air pipelines are burnt through because the sedimentation condition of a certain part of the pipeline cannot be found out by a feasible method and an effective treatment method is adopted. The invention can utilize the opportunity of 10-12 hours of damping down of the blast furnace to carry out accurate exploration and detection on the sedimentation amount of the refractory material of the lining of the hot air pipeline. And diagnosing the running state of the refractory material in the hot blast stove pipeline by detecting data, and proposing a maintenance suggestion. The hot air pipeline is prevented from being burnt through and the blast furnace does not have planned damping down due to the fact that the operation state of refractory materials in the hot air furnace pipeline is not clear and the refractory materials are not timely and effectively maintained. And simultaneously, the effect of improving the stability of the running state of the hot blast stove is also achieved.
Drawings
FIG. 1 is a schematic view showing a piping structure of a blast furnace hot blast stove according to the present invention.
In the figure: 1-steel shell, 2-spraying coating layer, 3-refractory fiber cotton, 4-refractory fiberboard, 5-measuring scale, 6-hole, 7-clay insulating brick, 8-high-alumina insulating brick and 9-refractory brick.
Detailed Description
The invention is further explained below with reference to the drawings and the embodiments.
Referring to fig. 1, a detection and diagnosis process for refractory material of a blast furnace hot blast stove pipeline lining comprises the following process steps:
the first step is as follows: carrying out infrared imaging on a pipeline of a hot blast stove, detecting a temperature field, detecting the upper part of the hot blast pipeline to be detected by using an infrared imager under the normal air supply state of the blast furnace, and taking a high-temperature part in imaging as a subsequent opening exploration detection target;
secondly, utilizing the blast furnace damping opportunity to carry out open pore exploration detection on the hot air pipeline, wherein in order to reduce the influence on the steel shell 1, the infrared imaging detection temperature is less than 200 ℃, the temperature difference of different parts in the length direction of the pipeline is less than 10 ℃, the open pore distance can be properly elongated, the infrared imaging temperature is greater than 250 ℃, and holes are needed to be opened under the infrared imaging temperature, specifically, ① steel shell 1 is opened, the hole opening equipment is a steel plate drilling machine with the diameter of 20-30 mm, if the steel plate drilling machine is not used, an acetylene gun and the like can be used for cutting the hole with the diameter of 20-30 mm, ② is used for punching a spray coating layer 2 by an air pick, the refractory materials are the refractory fiber cotton 3 and the refractory bricks 9, ③ is used for inserting a steel measuring ruler 5 or an iron rod which can not deform into the hole 6, the numerical value is directly read from the measuring ruler 5 or is marked on the iron rod, ④ settlement amount is determined, namely, the settlement amount of the refractory material is obtained by subtracting the thickness of the hole 1 from the size marked by the measuring ruler 5, and the settlement depth of the sprayed material, or the settlement depth of the steel shell is firstly measured by;
the third step: analyzing and diagnosing the sedimentation amount, wherein the bottom of the lower half circle of the pipeline is provided with the refractory fiber board 4, and if the sedimentation amount is slightly larger than the thickness (less than or equal to 20 mm) of the refractory fiber board 4, the refractory brick 9 of the pipeline has good comprehensive indexes such as masonry quality, refractoriness under load, low creep index and the like; if the lower part of the pipeline is not provided with the refractory fiber plate 4, the sedimentation amount is the comprehensive reflection of the masonry quality, the refractoriness under load, the low creep index and the like of the pipeline refractory bricks 9, if the temperature of the original steel shell 1 below the opening is more than 250 ℃, the refractory fiber cotton 3 after the opening does not exist, the sedimentation amount is more than 100mm, and the sedimentation amount is expanded into a skylight to be checked, wherein the skylight is checked, the skylight comprises the burning loss condition of the clay heat-insulating brick 7 and the high-alumina heat-insulating brick 8 and the crack condition of the heavy working layer refractory bricks 99, and as the hot air temperature in the hot air pipeline is usually more than 1000 ℃, the surface temperature of the steel shell 1 is lower than 300 ℃, the state of the heavy working layer refractory bricks 9 is usually only cracked, and;
the fourth step: the settlement treatment suggests that the settlement is less than 100mm, and grouting can be considered to fill the settlement space. The settlement is more than 100mm, usually because the heavy working layer firebrick 9 has cracks, the blow-by gas burns out and is caused, need to use ceramic fiber to stop up the gap first, then use the heavy material to carry on the pouring joint filling to the gap, then carry on the mud jacking and filling;
the fifth step: plugging the detection hole, filling the detection hole which is not planned for grouting or pouring, filling the detection hole with ceramic fibers, filling the detection hole with clay plastic, and welding the steel shell 1 back; and for the preparation of pouring treatment, welding the steel shell 1 back after the pouring treatment is finished, and after welding, suggesting that reinforcing ribs are welded on the welding seams, and carrying out ultrasonic flaw detection to prevent the welding seams from cracking after air supply is resumed.
The hot air pipeline in the first step comprises a hot air surrounding pipe, a hot air main pipe and a hot air branch pipe.
In order to prevent the casting material from flowing uncontrollably into other directions of the pipe in the fourth step, the area around the casting material is filled with ceramic fibers before casting.
The operation involves high temperature, and the labor protection articles should be worn before the operation to prevent scald.
Example (b):
currently, the thickness of the steel is 3200, 2500 and 1050m in a certain iron and steel group3The blast furnace hot air pipeline is applied, the accurate exploration and detection of the sedimentation amount of the refractory material of the lining of the hot air pipeline can be carried out by utilizing the 10-12-hour damping down opportunity of the blast furnace, the running state of the refractory material of the lining of the hot air pipeline is diagnosed through detection data analysis, and a maintenance suggestion is provided. The hot air pipeline can be prevented from being burnt through and the blast furnace does not have planned damping down due to the fact that the running state of the lining refractory material of the hot air furnace pipeline is not clear and the hot air pipeline is not timely and effectively maintained.
At present, the sedimentation phenomenon of the lining refractory material of the blast furnace hot air pipeline is more and more, and most of the hot air pipelines are burnt through because the sedimentation condition of a certain part of the pipeline cannot be found out by a feasible method and an effective treatment method is adopted. The invention can utilize the opportunity of 10-12 hours of damping down of the blast furnace to carry out accurate exploration and detection on the sedimentation amount of the refractory material of the lining of the hot air pipeline. And diagnosing the running state of the refractory material in the hot blast stove pipeline by detecting data, and proposing a maintenance suggestion. The hot air pipeline is prevented from being burnt through and the blast furnace does not have planned damping down due to the fact that the operation state of refractory materials in the hot air furnace pipeline is not clear and the refractory materials are not timely and effectively maintained. And simultaneously, the effect of improving the stability of the running state of the hot blast stove is also achieved.
Claims (1)
1. A detection and diagnosis process for refractory materials of a blast furnace hot blast stove pipeline lining is characterized by comprising the following process steps:
the first step is as follows: carrying out infrared imaging on a pipeline of a hot blast stove, detecting a temperature field, detecting the upper part of the hot blast pipeline to be detected by using an infrared imager under the normal air supply state of the blast furnace, and taking a high-temperature part in imaging as a subsequent opening exploration detection target, wherein the hot blast pipeline comprises a hot blast surrounding pipe, a hot blast main pipe and a hot blast branch pipe;
secondly, utilizing a blast furnace damping machine to carry out tapping exploration detection on the hot air pipeline, wherein in order to reduce the influence on the steel shell, the infrared imaging detection temperature is less than 200 ℃, the temperature difference of different parts in the length direction of the pipeline is less than 10 ℃, and the tapping distance is elongated, the infrared imaging temperature is more than 250 ℃, and holes must be drilled below the infrared imaging temperature, specifically comprising ① steel shell holes are drilled, the holes are drilled by a steel plate drilling machine with the diameter of 20-30 mm, if the steel plate drilling machine is not used, an acetylene gun is used for cutting the holes with the diameter of 20-30 mm, ② a pneumatic pick is used for punching a spray coating layer, the refractory materials below the spray coating layer are refractory fiber blankets and refractory bricks, ③ a steel measuring ruler or an undeformed iron rod is inserted into the holes, the numerical value is directly read from the graduated ruler or marked on the iron rod, ④ sedimentation amount is determined, namely the sedimentation amount of the refractory materials is determined by subtracting the thickness of the steel shell thickness and the thickness of the spray coating materials from the size in the graduated ruler mark, or the measurement scale is firstly inserted into the holes of the iron rod;
the third step: analyzing and diagnosing the settlement, wherein the bottom of the lower half circle of the pipeline is provided with a refractory fiber board, and if the settlement is slightly larger than the thickness of the refractory fiber board and is less than or equal to 20mm, the refractory brick of the pipeline has good comprehensive indexes including masonry quality, refractoriness under load and low creep index; if the lower part of the pipeline is not provided with the refractory fiber board, the sedimentation amount is the comprehensive embodiment of the masonry quality, the refractoriness under load and the low creep index of the refractory brick of the pipeline, if the temperature of the original steel shell below the opening is more than 250 ℃, the refractory fiber blanket after the opening does not exist, the sedimentation amount is more than 100mm, and the sedimentation amount is expanded into a skylight to be inspected, wherein the skylight is inspected, and the skylight comprises the burning loss condition of clay heat-insulating bricks and high-alumina heat-insulating bricks and the crack condition of the refractory brick of the heavy working layer, and because the hot air temperature in the hot air pipeline is usually more than 1000 ℃, the surface temperature of the steel shell is lower than 300 ℃, the state of the refractory brick of the heavy working layer is usually only;
the fourth step: the settlement amount is less than 100mm, and grouting is carried out to fill a settlement space; the settlement is more than 100mm, usually because the heavy working layer firebrick has cracks, blow-by gas burns and loses, need to use ceramic fiber to stop up the gap first, then use the heavy material to carry on the pouring joint filling to the gap, then carry on the mud jacking and pack; in order to prevent the casting material from uncontrollably flowing into other directions of the pipeline, the periphery to be cast is filled with ceramic fiber before casting;
the fifth step: plugging the detection hole, filling the detection hole which is not planned for grouting or pouring, filling the detection hole with ceramic fibers, filling the detection hole with clay plastic, and welding the steel shell back; for the pouring preparation, the steel shell is welded and repaired after the pouring treatment is finished, reinforcing ribs are recommended to be welded on the welding seams after the welding and the ultrasonic flaw detection is carried out, so that the welding seams are prevented from bursting after air supply is resumed;
the process involves high temperature, and the labor protection articles should be worn before operation to prevent scald.
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| CN111996325B (en) * | 2020-07-13 | 2022-04-12 | 广东韶钢松山股份有限公司 | Method and tool for quickly cleaning burner of hot blast stove |
| CN114383380A (en) * | 2022-01-10 | 2022-04-22 | 广东韶钢松山股份有限公司 | Side cooling device and method for hot air piping system compensator and improvement method |
| CN115820962A (en) * | 2022-11-30 | 2023-03-21 | 中冶武汉冶金建筑研究院有限公司 | Method for quickly replacing damaged area of blast furnace hot blast stove pipeline |
| CN118070407B (en) * | 2024-04-22 | 2024-07-02 | 江苏省建筑工程质量检测中心有限公司 | Image processing-based fireproof air duct fire resistance limit simulation and optimization design method |
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