Online maintenance method for collapse of heat accumulator of hot blast stove

Abstract

The invention relates to the field of hot-blast stove maintenance, and discloses a hot-blast stove heat accumulator collapse online maintenance method. The hot-blast stove heat accumulator collapse online maintenance method comprises the steps that firstly, a heat accumulator collapse part is determined; 2, according to the collapse part of the heat accumulator determined in the step 1, drilling sampling is conducted on the hot blast stove, a sample body is analyzed, and the collapse area and boundary of the heat accumulator are determined; 3, a curing material is manufactured and conveyed to the foundation part of the collapse area, and the foundation part of the collapse area is reinforced; and 4, a new heat accumulator (5) is added to the upper cavity area of the collapse part of the heat accumulator, and the heat accumulation and exchange function of the heat accumulator is recovered. The online maintenance method for collapse of the heat accumulator of the hot blast stove can be used for online maintenance of collapse of the heat accumulator of the hot blast stove in the production process.

Description

Technical Field

[0001] The invention relates to the field of hot blast stove maintenance, and in particular to an online maintenance method for the collapse of a heat storage body of a hot blast stove. Background Art

[0002] A hot blast furnace is a device used to heat air. Its basic working principle is to heat the air by burning fuel or using electricity and then send it into the space or equipment that needs to be heated. Stable hot blast furnace regenerator working conditions are an important condition for stable blast furnace production.

[0003] The heat storage body of the hot blast stove may collapse, and once the heat storage body collapses, measures must be taken quickly, otherwise the working condition of the hot blast stove will deteriorate rapidly, causing the entire hot blast stove to be scrapped and unable to work.

[0004] At present, it is impossible to detect the boundaries and areas of the thermal storage body collapse when the hot blast furnace is in production, so it is impossible to take targeted measures to control and delay the further development of the thermal storage body collapse. The conventional treatment method is to slow down the rapid deterioration trend of the thermal storage body collapse hazard by reducing (or stabilizing) the temperature of the hot blast furnace dome; for a blast furnace equipped with four hot blast furnaces, it is necessary to shut down a hot blast furnace with the hazard of thermal storage body collapse, and start the operation of replacing the thermal storage body offline within a long period. This method usually takes 3 to 4 months; for a blast furnace equipped with only three hot blast furnaces, it is necessary to build a new hot blast furnace. After the new hot blast furnace is put into use, the hot blast furnace with the thermal storage body collapse will be withdrawn from the production sequence for offline maintenance.

[0005] The current maintenance methods have the following disadvantages: large investment. If the method of stopping the furnace to replace the heat storage body is adopted, all the heat storage bodies in the collapsed area and the non-collapsed area need to be replaced with new heat storage bodies at one time, which requires a considerable investment; if the method of building a new hot blast furnace is adopted, the investment will be even greater; and the method of stopping the hot blast furnace and then separating it from the production sequence and then performing offline treatment not only has a long construction period, but also has a very long period of impact on the stable production of the blast furnace; and stopping the furnace to replace the heat storage body requires entering the furnace to operate, and the safety risk is also very high. Summary of the invention

[0006] In order to overcome the problems of large investment, long construction period and high safety risk in the prior art when repairing the collapse of the heat storage body, the present invention provides an online repair method for the collapse of the heat storage body of a hot blast furnace. The online repair method for the collapse of the heat storage body of a hot blast furnace can be used to perform online repair on the collapse of the heat storage body of the hot blast furnace during the production process.

[0007] In order to achieve the above object, the present invention provides an online repair method for the collapse of a heat storage body of a hot blast stove, the online repair method for the collapse of a heat storage body of a hot blast stove comprising:

[0008] Step 1: Determine the location where the thermal storage body collapses;

[0009] Step 2: According to the location of the heat storage body collapse determined in step 1, drilling and sampling are performed on the hot blast stove, and the samples are analyzed to determine the area and boundary of the heat storage body collapse;

[0010] Step 3: Prepare and transport the solidified material to the base of the collapsed area to reinforce the base of the collapsed area;

[0011] Step 4: Add a new heat storage body to the upper hollow area of ​​the collapsed part of the heat storage body to restore the heat storage and exchange function of the heat storage body.

[0012] Preferably, the hot blast furnace is provided with a high temperature resistant endoscope, and in the step 1, the location where the heat storage body collapses is determined by the high temperature resistant endoscope.

[0013] Preferably, in step 1, if the grate is deformed, the deformed grate needs to be reinforced and supported.

[0014] Preferably, the step 2 further comprises building a working platform, and according to the location of the heat storage body collapse determined in the step 1, the working platforms are built at different heights, and the drilling work on the hot blast stove is carried out on the working platform.

[0015] Preferably, in the step 2, a furnace shell flange is welded on the hot blast furnace at the drilling position, and the furnace shell flange is matched with a flange cover plate for sealing the hot blast furnace.

[0016] Preferably, in the step 2, when drilling the hot blast stove, the temperature of the drilling position is recorded in real time.

[0017] Preferably, in step three, the solidified material is produced according to the temperature of the drilling position recorded in step two.

[0018] Preferably, the hot blast stove drilling operation is carried out multiple times on the same working platform, and the boundaries of the thermal storage body collapse are determined by multiple drillings.

[0019] Preferably, the input position of the solidified material is determined according to the area and boundary of the collapsed thermal storage body determined in the step 2, and a plurality of the input positions can be provided, and the plurality of input positions uniformly cover the area at the bottom of the collapsed thermal storage body.

[0020] Preferably, in step 4, the new heat storage body is configured to have a shape with good fluidity.

[0021] According to the above technical solution, the heat storage body of the hot blast furnace is filled in the heat exchange section of the hot blast furnace, and is located above the grate. Due to factors such as the material and manufacturing defects of the grate, installation errors, and foundation deformation, the grate may be deformed. When the grate is deformed, the heat storage body itself has quality problems during manufacturing, or the water-cooled hot air valve of the hot blast furnace equipment leaks a lot of water, the leaked cooling water contacts the heat storage body, which will cause the heat storage body to be broken and pulverized. Once the heat storage body is broken and pulverized, the heat storage body will fall from the grate hole in pieces, and the heat storage body will partially collapse, thereby causing the heat storage body's resistance to the hot air to disappear, so that the hot air can quickly pass through the heat exchange section to reach the grate.

[0022] The temperature of high-temperature flue gas entering the heat exchange section is about 1400℃. Under normal circumstances, these high-temperature gases need to flow downward gradually through the gas path formed by the combination of multiple layers of heat storage bodies. During the flow process, the high-temperature air fully contacts and exchanges heat with the heat storage bodies in the heat exchange section, thus heating the heat storage bodies. Under normal circumstances, the temperature of the high-temperature gas reaching the grate after heat exchange is about 450℃. For the grate made of RQTSi4Mo, a common grate material, the normal operating temperature should be lower than 480℃. However, when the heat storage body collapses, the heat storage body originally filled in the heat exchange section sinks to the bottom, resulting in a cavity in the heat exchange section. The high-temperature gas will quickly reach the bottom through this cavity and contact the grate at the bottom and the heat storage body in the low-temperature section. Since it can directly contact the high-temperature hot gas, the temperature at the grate rises rapidly. When the temperature of the grate is higher than 480℃, it may cause the grate to deform and fail. Once the grate is deformed and fails and cannot be effectively handled, it may cause the heat storage body to break and collapse, thus leading to the failure of the hot blast furnace.

[0023] Therefore, in order to effectively monitor the collapse of the heat storage body in the hot blast stove, multiple sets of thermocouples are installed on the hot blast stove to detect whether the heat storage body therein collapses. Thermocouples are used to detect the heating rate in the hot blast stove to determine whether the heat storage body at that position has failed. Because the heat storage body collapses, it cannot effectively block the high-temperature gas, allowing the high-temperature flue gas to quickly pass through that position and cause the thermocouple at that position to heat up quickly.

[0024] Preferably, multiple thermocouples can be provided, and multiple thermocouples are provided along the height and circumference of the hot blast stove respectively. At the same height, multiple thermocouples arranged along the circumference can detect the position on the cross section of the hot blast stove where the collapse of the heat storage body occurs, while the thermocouples in the height direction can monitor the depth of the collapse of the heat storage body, thereby being able to determine the degree of the collapse of the heat storage body and preliminarily locate the bottom position of the collapse of the heat storage body.

[0025] Preferably, multiple thermocouples are arranged at the grate position, and the multiple thermocouples evenly cover the grate, so that full coverage monitoring of the grate can be achieved. When the thermocouple feedback grate temperature is higher than 480°C, overheating may occur, causing the grate to deform, and the grate deformation is very harmful, which may cause the collapse of the entire heat storage body, so it is necessary to strengthen the temperature detection of the grate.

[0026] When the thermocouple monitors the collapse of the heat storage body, first confirm the rate of temperature change of the grate during operation. If the rate of temperature change of the grate is higher than the temperature change rate of the thermocouple at the corresponding position of other normally working hot blast furnaces for a long time, it is necessary to check the deformation of the grate. Once the grate is found to be deformed, it is necessary to deal with the deformation problem of the grate first.

[0027] When dealing with the deformation of the grate, maintenance personnel can enter the bottom of the grate through the flue manhole during routine maintenance of the blast furnace, and add columns under the grate to support the grate to achieve reinforcement of the grate. This can prevent the grate from further deformation or even displacement, which can cause the heat storage body to collapse.

[0028] After the deformation of the grate is reinforced, the collapsed position of the heat storage body can be processed. Before processing the collapsed position of the heat storage body, it is necessary to first determine the location and range of the heat storage body collapse. The online maintenance method for the heat storage body collapse of the hot blast furnace can determine the location and range of the heat storage body collapse by drilling and sampling the hot blast furnace.

[0029] Specifically: the high temperature resistant endoscope can observe the approximate location of the collapse, and the bottom position of the collapse can be determined through observation with the high temperature resistant endoscope. Then, a hole is drilled and sampled at the bottom position of the collapse through a high temperature resistant drilling machine, and the taken out heat storage body is observed. If any fragmentation or powdering is found, it means that the position is located where the heat storage body has collapsed. Then, sampling can continue to be performed towards the edge of the collapsed heat storage body until the sampled heat storage body is a complete structure. If the heat storage body in the sample is not fragmented or powdered, it means that the boundary between the sampling point and the previous sampling point is the collapse boundary of the heat storage body.

[0030] During the sampling process, the situation inside the hot air furnace can be observed through a high-temperature resistant endoscope to more effectively adjust the sampling point.

[0031] The purpose of sampling to find the collapse boundary is to input the solidified material into the hot air furnace in a targeted manner to prevent the solidified material from exceeding the collapse boundary of the heat storage body and reaching the heat storage body position in the normal area. After the solidified material acts on the normal heat storage body, it may affect the use effect of the heat storage body in the normal area.

[0032] After finding the boundary of the heat storage body collapse, solidified materials can be transported to the debris deposition area below the collapsed area, with the aim of bonding the fragmented materials of the heat storage body into a whole. On the one hand, the bonded whole can block the hot air, and more importantly, after being bonded into a whole, the debris will not continue to fall, and it can have a certain strength to support the new heat storage body material that is subsequently placed in.

[0033] After the solidifying material is delivered to the location, it is necessary to wait for a while. After the solidifying material has solidified and the fragmented heat storage body at the bottom has been bonded into a whole, new heat storage body can be added from the top to the cavity at the collapsed part of the heat storage body until the cavity is filled.

[0034] Preferably, the thermal storage body delivery system needs to be located at an upper position of the collapsed area so as to add new thermal storage body until the new thermal storage body fills up the cavity.

[0035] Preferably, after the hollow position is filled with a new heat storage body, the hot air blocking function of the hot blast furnace can be restored. At this time, the hollow left by drilling during the maintenance process can also be filled with high-temperature resistant materials, so that the hot blast furnace can have a better insulation effect and can also effectively protect the furnace shell. At this time, the heat exchange section of the hot blast furnace has restored the heat exchange function. Therefore, after the new heat storage body is completed and the construction channel of the hot blast furnace wall is blocked by process, the maintenance of the hot blast furnace is completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 The present invention is a schematic diagram of online maintenance of a hot blast stove heat storage body collapse.

[0037] Description of Reference Numerals

[0038] 1 furnace shell 2 wall

[0039] 3High temperature resistant endoscope 4Thermal storage body delivery system

[0040] 5 New heat storage body 6 Working platform

[0041] 13 High temperature resistant transmission pipeline 8 Furnace shell flange

[0042] 9 Flange cover 10 High temperature resistant drilling machine

[0043] 11 grate 12 solidified material conveyor unit DETAILED DESCRIPTION

[0044] In the present invention, unless otherwise stated, directional words such as "boundary, height" generally refer to the orientation of the term in normal use, or are common names understood by those skilled in the art, and should not be regarded as limitations on the term.

[0045] An online repair method for a hot blast stove heat storage body collapse, the online repair method for a hot blast stove heat storage body collapse comprising:

[0046] Step 1: Determine the location where the thermal storage body collapses;

[0047] Step 2: According to the location of the heat storage body collapse determined in step 1, drilling and sampling are performed on the hot blast stove, and the samples are analyzed to determine the area and boundary of the heat storage body collapse;

[0048] Step 3: Prepare and transport solidified materials to the collapsed area to reinforce the collapsed area;

[0049] Step 4: Add new heat storage body 5 to the upper hollow area of ​​the collapsed part of the heat storage body to restore the heat storage and exchange function of the heat storage body.

[0050] Through the implementation of the above technical solution, the heat storage body of the hot blast stove is filled in the heat exchange section of the hot blast stove, and is located above the grate 11. Due to factors such as the material and manufacturing defects of the grate, installation errors, and foundation deformation, the grate may be deformed. When the grate is deformed, the heat storage body itself has quality problems during manufacturing, or a large amount of water leaks from the water-cooled hot air valve of the hot blast stove equipment, the leaked cooling water contacts the heat storage body, which will cause the heat storage body to be fragmented and pulverized. Once the heat storage body is fragmented and pulverized, the heat storage body will collapse and fall downward in fragments, thereby causing the heat storage body's resistance to the hot air to disappear, so that the hot air can quickly pass through the heat exchange section to reach the grate 11.

[0051] The temperature of the high-temperature flue gas entering the heat exchange section is about 1400°C. Under normal circumstances, these high-temperature gases need to flow downward gradually through the gas path formed by the combination of multiple layers of heat storage bodies. During the flow process, the high-temperature air fully contacts and exchanges heat with the heat storage bodies in the heat exchange section, thereby heating the heat storage bodies. Under normal circumstances, the temperature of the high-temperature gas after heat exchange is less than 450°C when it reaches the grate 11. For the grate made of RQTSi4Mo, a common grate material, its normal operating temperature should be lower than 480°C. However, when the heat storage body collapses, the heat storage body originally filled in the heat exchange section sinks to the bottom, resulting in a cavity in the heat exchange section. The high-temperature gas will quickly reach the bottom through this cavity and contact the grate 11 at the bottom and the heat storage body in the low-temperature section. Since it can directly contact the high-temperature hot gas, the temperature at the grate 11 rises rapidly. When the temperature of the grate 11 is higher than 480°C, it may cause the grate 11 to deform and fail. Once the grate 11 fails to deform and is not effectively handled, it may cause large-scale collapse of the heat storage body, thereby causing the hot blast furnace to malfunction.

[0052] Therefore, in order to effectively monitor the collapse of the heat storage body in the hot blast stove, multiple sets of thermocouples are arranged on the hot blast stove to detect the actual working temperature of the heat storage body therein, and monitor whether the heat storage body and / or the grate 11 collapse. Thermocouples are used to detect the heating rate in the hot blast stove to determine whether the heat storage body at that position has failed. Because the heat storage body collapses, it cannot effectively block the high-temperature gas, allowing the high-temperature flue gas to quickly pass through that position, and causing the thermocouple at that position to heat up quickly.

[0053] Preferably, multiple thermocouples can be provided, and multiple thermocouples are provided along the height and circumference of the hot blast stove respectively. At the same height, multiple thermocouples arranged along the circumference can detect the position on the cross section of the hot blast stove where the collapse of the heat storage body occurs, while the thermocouples in the height direction can monitor the depth of the collapse of the heat storage body, thereby being able to determine the degree of the collapse of the heat storage body and preliminarily locate the bottom position of the collapse of the heat storage body.

[0054] Preferably, multiple thermocouples need to be arranged at the position of the grate 11, and the multiple thermocouples evenly cover the grate 11, so as to achieve full coverage monitoring of the grate 11. When the thermocouple feedback shows that the temperature of the grate 11 is higher than 450°C, overheating may occur, causing the grate 11 to deform, and the deformation of the grate 11 is very harmful, which may cause the collapse of the entire heat storage body, so it is necessary to strengthen the temperature detection of the grate 11.

[0055] When the thermocouple detects that the heat storage body has collapsed, first confirm the rate of temperature change of the grate 11 during operation. If the rate of temperature change of the grate 11 is higher than the temperature change rate of the thermocouples at the corresponding positions of other normally working hot blast furnaces for a long time, it is necessary to check the deformation of the grate 11. Once deformation of the grate 11 is found, the deformation problem of the grate 11 needs to be dealt with first.

[0056] When dealing with the deformation of the grate 11, maintenance personnel can enter the bottom of the grate 11 through the manhole at the bottom of the hot blast furnace or the manhole at the flue during routine maintenance of the blast furnace, and add columns under the grate 11 to support the grate 11, so as to reinforce the grate 11. This can prevent the grate 11 from further deformation or even displacement, which may cause the heat storage body to collapse.

[0057] After the deformation of the grate 11 is reinforced, the collapsed position of the heat storage body can be processed. Before processing the collapsed position of the heat storage body, it is necessary to first determine the position and range of the collapsed heat storage body. The online maintenance method for the collapsed heat storage body of the hot blast stove can determine the position and range of the collapsed heat storage body by drilling and sampling the hot blast stove.

[0058] Specifically: the high temperature resistant endoscope 3 can observe the approximate position of the collapse, and the bottom position of the collapse can be determined through the observation of the high temperature resistant endoscope 3. Then, the bottom position of the collapse is drilled and sampled by the high temperature resistant drilling machine 10, and the taken out heat storage body is observed. If there is any fragmentation or powdering, it means that the position is located at the position where the heat storage body collapsed, and then sampling can be continued towards the edge of the collapsed heat storage body until the sampled heat storage body is a complete structure. The heat storage body in the sample is not fragmented or powdered, which means that the boundary between the sampling point and the previous sampling point is the collapse boundary of the heat storage body.

[0059] During the sampling process, the situation inside the hot blast furnace can be observed through the high temperature resistant endoscope 3 so as to more effectively adjust the sampling point.

[0060] The purpose of sampling to find the collapse boundary is to input the solidified material into the hot air furnace in a targeted manner to prevent the solidified material from exceeding the collapse boundary of the heat storage body and reaching the heat storage body position in the normal area. After the solidified material acts on the normal heat storage body, it will affect the use effect of the heat storage body in the normal area.

[0061] After finding the boundary of the heat storage body collapse, solidified materials can be transported to the debris deposition area below the collapsed area, with the aim of bonding the fragmented materials of the heat storage body into a whole. On the one hand, the bonded whole can block the hot air, and more importantly, after being bonded into a whole, the debris will not continue to fall, and it can have a certain compressive strength, which can support the new heat storage body material that is subsequently placed in.

[0062] After the solidifying material is delivered to the place, it is necessary to wait for a while. After the solidifying material has solidified and the fragmented heat storage body at the bottom has been bonded into a whole, a new heat storage body 5 can be added from the top to the cavity at the collapsed part of the heat storage body until the cavity is filled.

[0063] Preferably, the thermal storage body conveying system 4 needs to be located at an upper position of the thermal storage body collapse area so as to add new thermal storage body 5 until the new thermal storage body 5 fills up the cavity.

[0064] Preferably, after the hollow position is filled with the new heat storage body 5, the hot blast stove can restore its function of blocking the hot blast, and the heat exchange section of the hot blast stove can restore its function of heat exchange. At this time, the hollow left by the drilling process can be filled with high temperature resistant materials, so that the hot blast stove can have a better heat preservation effect, and the furnace shell can also be effectively protected. At this time, therefore, after the new heat storage body 5 is added, the hot blast stove is repaired.

[0065] In this embodiment, preferably, the hot blast furnace is provided with a high temperature resistant endoscope 3. In step one, the location where the heat storage body collapses is determined by the high temperature resistant endoscope 3.

[0066] The high temperature resistant endoscope 3 can provide a more intuitive observation of the actual situation in the hot blast furnace, and the monitoring function of the auxiliary thermocouple can more quickly determine the location of the heat storage body collapse.

[0067] Moreover, when implementing step 2, the high temperature endoscope 3 can also more quickly determine the sampling position of the high temperature drilling machine 10. With the help of the high temperature endoscope 3, it is also possible to be more targeted when searching for the boundary of the heat storage body.

[0068] Preferably, the portion of the high-temperature resistant endoscope 3 extending into the hot air furnace needs to be subjected to high-temperature resistant treatment, including but not limited to using high-temperature resistant materials to make the probe portion of the high-temperature resistant endoscope 3, and the probe portion of the high-temperature resistant endoscope 3 extends into the hot air furnace; at the same time, circulating cooling treatment can also be performed at the probe position, and the probe portion can be subjected to real-time and sustainable cooling treatment through cooling water circulation.

[0069] Preferably, at least two detection holes are provided on the hot blast furnace, one detection hole is located at the upper part of the heat storage body, and the other detection hole is located at the lower part of the grate 11. The upper detection hole can observe the position of the heat storage body collapse, and the detection hole located at the lower part of the grate 11 can easily observe the working status of the grate 11. At the same time, the collapse of the heat storage body can also be observed through the detection hole located at the lower part of the grate 11, which can be verified with the situation observed by the upper detection hole, so as to help maintenance personnel judge the degree and range of the collapse of the heat storage body.

[0070] In this embodiment, preferably, in step one, if the grate 11 is deformed, the deformed grate 11 needs to be reinforced and supported.

[0071] The deformation of the grate 11 is extremely harmful to the heat storage body. Once the grate 11 is deformed and displaced to a certain extent, it may detach, and may eventually cause the collapse of all the heat storage bodies in the hot blast furnace. Therefore, it is necessary to detect the state of the grate 11, especially when the collapse of the heat storage body has been found, it is necessary to pay special attention to the state of the grate 11 to avoid the situation where the deformation of the grate 11 causes the heat storage body to collapse aggravatedly.

[0072] The hot blast furnace is provided with a detection hole below the grate 11. During production, the high temperature endoscope 3 can be inserted through the detection hole to observe the use status of the grate 11. At the same time, the temperature value displayed by the thermocouple at the grate 11 can also verify the actual status of the grate 11. When the temperature at the grate 11 is normal and the status of the grate 11 observed by the high temperature endoscope 3 is also normal, it can be considered that the status of the grate 11 is normal and no processing is needed temporarily. Step 2 can be directly performed to drill and sample the hot blast furnace to determine the area and boundary of the heat storage body collapse.

[0073] However, if it is observed that the grate 11 has been deformed, it is necessary to reinforce the grate 11 first, and the second step of sampling can be carried out only after the grate 11 is reinforced.

[0074] When reinforcing the deformed position of the grate 11, maintenance personnel can enter the bottom of the grate 11 through the maintenance passage, and then fix the supporting columns under the deformed position of the grate 11. By supporting the grate 11 with the supporting columns, the aggravation of the deformation of the grate 11 can be avoided, thereby effectively curbing the further collapse of the heat storage body at this position.

[0075] In this embodiment, preferably, step two also includes building a working platform 6 , and according to the location of the heat storage body collapse determined in step one, the working platform 6 is built at different heights, and the drilling work on the hot blast stove is carried out on the working platform 6 .

[0076] The approximate location and range of the thermal storage body collapse can be roughly determined by the data fed back by the thermocouple and the observation photos or videos of the high temperature endoscope 3. According to the determination result, the operator needs to drill the hot blast stove to confirm the boundary of the thermal storage body collapse.

[0077] Drilling operations require human operation and usually need to last for a period of time. Therefore, in order to facilitate the operation of drillers, a work platform 6 needs to be built on the outside of the hot air furnace so that personnel can stand on the work platform 6 to perform drilling operations. The drilled samples can also be placed on the spot, which is very convenient.

[0078] After the high-temperature endoscope monitors the approximate location of the thermal storage body collapse, the operator can determine the bottom position of the thermal storage body collapse area based on experience. After the thermal storage body collapses, the thermal storage body fragments will fall to the bottom of the collapsed area. After drilling a hole at this position and determining the boundary of the collapse, the solidifying material can be transported to the bottom of the collapse to bond the thermal storage body fragments in the entire area.

[0079] The drilling position is selected on the hot blast furnace according to the bottom position of the heat storage body collapse determined by the staff. Since the drilling will start from the furnace shell 1 and gradually drill inward, the drilling will damage the furnace shell 1 of the hot blast furnace, the wall 2 close to the furnace shell 1 and even the heat storage body, and the wall 2 is the insulation layer of the hot blast furnace. Therefore, the drilling holes will affect the insulation performance of the hot blast furnace. Therefore, the number of drillings should be reduced as much as possible.

[0080] When the heat storage body is fragmented or pulverized in the sample obtained through drilling, it means that the location is still at the heat storage body collapse site. When the heat storage body structure in the sample is intact and there is no fragmentation or pulverization, it means that the drilling location is outside the heat storage body collapse site. Therefore, the boundary of the heat storage body collapse is between these two drilling locations.

[0081] In this embodiment, preferably, in step 2, a furnace shell flange 8 is welded to the hot blast furnace at the drilling position, and the furnace shell flange 8 is equipped with a flange cover plate 9 for sealing the hot blast furnace during online construction.

[0082] The working state of the hot blast furnace is divided into three states: burning furnace, stuffy furnace, and air supply. Burning furnace means that the combustion chamber of the hot blast furnace starts to burn, and the burning smoke enters the heat exchange chamber to heat the heat storage body in the heat exchange chamber. When the temperature of the heat storage body reaches the preset target, the combustion can be stopped. At this time, the working state of the burning furnace ends. Then the cold air below is sent into the heat exchange chamber to exchange heat with the already heated heat storage body, and after the heat exchange is completed, it is sent out from the upper outlet for production. When the temperature of the heat storage body drops to the preset target, the air supply working state is completed. The period of time when the air supply is completed and the burning furnace has not started is the stuffy furnace working state of the hot blast furnace. Since hot blast furnaces are usually set up in multiples, and multiple hot blast furnaces work in turn, each hot blast furnace can have a period of rest time after completing the burning and sending operations, which is the stuffy furnace state of the hot blast furnace. The operation of drilling holes in the hot blast furnace is carried out when the hot blast furnace is in the stuffy furnace state.

[0083] When the hot blast stove is in a stuffy state, a high temperature resistant drilling machine 10 is used to drill the hot blast stove, and the samples obtained by drilling are taken out to determine whether the heat storage body at the drilling position is collapsed and the degree of fragmentation of the heat storage body.

[0084] The top of the heat storage body inside the hot blast furnace and the lower part of the grate 11 are monitored with a high temperature endoscope 3 to preliminarily determine the position of the heat storage body collapse, the location of the collapse and the area of ​​the collapsed location. The corresponding defect location is accurately delineated on the outside of the furnace shell 1 and the location and number of openings for defect treatment construction are determined at the bottom of the defect location.

[0085] After determining the number of holes to be opened, weld the furnace shell flange 8 for construction at the hole opening position. During the hot blast furnace rotation interval, that is, when the hot blast furnace is in a stuffy working state, use a high-temperature resistant drilling machine 10 to open holes in the furnace shell 1, the wall 2, and the collapsed part of the heat storage body through the furnace shell flange 8. If the hot blast furnace needs to be started during the opening process, the high-temperature resistant drilling machine 10 will be withdrawn immediately, and the construction flange will be sealed with the flange cover plate 9 to prevent hot air from leaking from the hole position and ensure the normal online air supply of the hot blast furnace. When the hot blast furnace is in a stuffy working state during rotation, open the flange cover plate to continue the hole opening construction work. After the hole opening construction is completed, install the flange cover plate to close it and proceed to the next hole opening construction work.

[0086] During the drilling sampling process, the visible area inside the hot blast furnace is sampled and monitored by video using a high temperature resistant endoscope 3, so as to have a more intuitive understanding of the scattered state of the heat storage body fragments at the bottom of the heat storage body collapse, which is convenient for maintenance personnel to make solidified materials and determine the input position of solidified materials.

[0087] During the drilling process, the samples obtained when the drilling depth is different should be observed and analyzed. After drilling, the high temperature endoscope 3 can be inserted into the hot blast furnace through the hole to observe the visible area of ​​the hot blast furnace at that position. The conditions at different levels in the hot blast furnace can be inspected by taking photos and recording videos. Maintenance personnel can also formulate a more effective curing material input plan by analyzing photos and videos.

[0088] In this embodiment, preferably, in step 2, when drilling the hot blast stove, the temperature of the drilling position is recorded in real time.

[0089] The temperature of the collapsed bottom of the hot blast furnace is detected, and the curing temperature of the curing material is determined based on the detection result.

[0090] The curing material is a heat-sensitive refractory material, which will start to solidify when the temperature reaches the curing temperature. Therefore, a temperature sensor needs to be provided at the front end of the high-temperature resistant drilling machine 10 so that the real-time temperature of the hot air furnace can be detected during the drilling process. The real-time monitored temperature value is provided to the maintenance personnel, who will make curing materials suitable for the temperature after comprehensively considering the temperature in the furnace body. So that the curing material can be reliably cured after being input to the target position, thereby achieving the purpose of bonding the heat storage body fragments.

[0091] In addition to determining the curing temperature, the curing material also needs to consider the curing time, that is, how long it takes for the curing material to completely solidify after reaching the curing temperature. The repair process needs to use this curing time to allow the curing material to flow into the thermal storage body fragments, achieve adhesion to the thermal storage body fragments, and finally form the purpose of overall curing of the thermal storage body fragments.

[0092] Since the solidifying material is a heat-sensitive material, it is necessary to avoid contact between the solidifying material and high-temperature substances before the heat storage body is transported to the target position. Preferably, the solidifying material needs to be cooled during the input of the solidifying material to avoid premature solidification of the solidifying material, which affects the flow effect of the solidifying material after it reaches the target position.

[0093] In this embodiment, preferably, in step three, the solidified material is produced according to the temperature of the drilling position recorded in step two.

[0094] The curing temperature of the curing material needs to be adjusted on-site according to the temperature of the location where it needs to be placed. Therefore, the actual temperature in the hot air furnace measured during the drilling process is the best basis for making the curing temperature of the curing material.

[0095] In addition to the curing temperature, the crushing of the drilled sample and the particle size of the thermal storage body fragments are also factors that need to be considered when making the curing material.

[0096] In this embodiment, preferably, the hot blast stove drilling operation is performed multiple times on the same working platform 6, and the boundaries of the thermal storage body collapse are determined by multiple drillings.

[0097] The bottom position of the collapse is determined by observation with a high temperature endoscope 3, and a working platform 6 is built at a position slightly lower than the bottom of the collapse of the heat storage body. On the working platform 6, a high temperature drilling machine 10 is used to drill the hot blast furnace. Multiple drillings are required to find two drilling positions where the heat storage body sample is pulverized and the heat storage body sample is not pulverized, and the boundary of the collapse is between the two drilling holes.

[0098] Similarly, the state of the heat storage body sample in the drilling depth direction can also determine the boundary of the collapse in the depth direction. After determining the boundary of the bottom of the collapse, the solidifying material can be input in a targeted manner so that the solidifying material can reliably bond to the heat storage body fragments without affecting the normal use of the heat storage body.

[0099] In this embodiment, preferably, the input position of the solidified material is determined according to the area and boundary of the thermal storage body collapse determined in step 2, and multiple input positions can be set, and the multiple input positions evenly cover the area of ​​the thermal storage body collapse.

[0100] When the collapsed area is large, it is necessary to set up multiple input points for the solidifying material. Since the effective range of the solidifying material is limited, full coverage of the collapsed area can be achieved by setting up multiple input points for the solidifying material.

[0101] In the process of conveying the solidified material, in order to prevent the solidified material from solidifying prematurely, the solidified material needs to be cooled. One implementation method is to set a cooling cylinder in the hole wall used by the solidified material conveying unit 12. The cooling cylinder is built into the conveying hole, and the high temperature resistant conveying pipeline 13 of the solidified material conveying unit 12 passes through the cooling cylinder to input the solidified material to the hot blast furnace. Circulating water is set in the cooling cylinder so that the temperature of the solidified material will not rise too high before reaching the target position. After being conveyed to the target position, the solidified material immediately exchanges heat with the hot blast furnace and starts to solidify.

[0102] During the transportation of the curing material, a high-temperature resistant endoscope 3 is used at the bottom of the hot blast furnace grate 11 to timely monitor the curing effect of the curing material, and according to the real-time monitoring situation, the material curing performance is adjusted to prevent the curing material from exceeding the collapse boundary of the heat storage body and affecting the use effect of the heat storage body in the normal non-treatment area.

[0103] In this embodiment, preferably, in step four, the new heat storage body 5 is configured to have a shape with good fluidity.

[0104] After the solidified material is transported to the target position, it will wait for a period of time for the solidified material to be solidified. After the thermal storage body fragments at the bottom are observed to be completely solidified through the high-temperature endoscope at the bottom of the grate 11, a new thermal storage body 5 can be added to the hot blast furnace through the thermal storage body conveying system 4 above, and the new thermal storage body 5 is set to have good fluidity so that it can move better in the hot blast furnace, so as to more effectively fill the space created by the collapse of the thermal storage body.

[0105] Preferably, the new heat storage body 5 is set to be spherical, so that the new heat storage body 5 can roll in the hot blast stove. The rolling makes the new heat storage body 5 have better fluidity and can more conveniently fill the cavity area in the hot blast stove.

[0106] New heat storage bodies 5 are continuously added until the space created by the collapse is completely filled up by the new heat storage bodies 5, thus achieving online maintenance of the collapsed heat storage bodies of the hot blast furnace, at which time the hot blast furnace can be used normally. Moreover, the entire maintenance process does not require the blast furnace to be shut down, but can be carried out in the hot blast furnace's stuffy working state during the intervals between hot blast furnace rotations.

[0107] The process method of the present invention is adopted to treat the hazard at the early stage of the thermal storage body collapse hazard, which can prevent the hazard from further development and deterioration, thereby effectively avoiding the investment in later construction. Compared with conventional methods, the present invention has less investment and good economic benefits.

[0108] This method of online treatment during the production of the hot blast furnace can also avoid the impact on production stability to the greatest extent. At the same time, the present invention occupies less site space, has a very short construction period, has almost no impact on normal production, and can also avoid the waste of materials in the conventional construction of new hot blast furnaces and replacement of heat storage bodies, saving equipment investment. At the same time, online treatment can also effectively utilize the normal heat storage bodies in the hot blast furnace, and the resource reuse rate is also very high.

[0109] The working place of the present invention is carried out outside the hot blast furnace, thus avoiding the defect of high safety risk of entering the hot blast furnace for working in the conventional method. Compared with the conventional method, the present invention has more reliable safety.

[0110] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0111] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0112] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. An online maintenance method for the collapse of a hot blast stove heat storage body, characterized in that: The hot blast stove heat storage body collapse online maintenance method comprises: Step 1: Determine the location where the thermal storage body collapses; Step 2: According to the location of the heat storage body collapse determined in step 1, drilling and sampling are performed on the hot blast stove, and the samples are analyzed to determine the area and boundary of the heat storage body collapse; Step 3: Prepare and transport the solidified material to the base of the collapsed area to reinforce the base of the collapsed area; Step 4: Add a new heat storage body (5) to the upper hollow area of ​​the collapsed part of the heat storage body to restore the heat storage and exchange function of the heat storage body.

2. The online repair method for hot blast stove heat storage body collapse according to claim 1, characterized in that: The hot blast furnace is provided with a high temperature resistant endoscope (3). In the step 1, the location where the heat storage body collapses is determined by using the high temperature resistant endoscope (3).

3. The online repair method for the collapse of the heat storage body of the hot blast stove according to claim 2 is characterized in that: In the step 1, if the grate (11) is deformed, it is also necessary to reinforce and support the deformed grate (11).

4. The online repair method for the collapse of the heat storage body of a hot blast stove according to claim 2 is characterized in that: The step 2 also includes building a working platform (6). According to the location of the heat storage body collapse determined in the step 1, the working platform (6) is built at different heights, and the drilling work on the hot blast furnace is carried out on the working platform (6).

5. The online repair method for hot blast stove heat storage body collapse according to claim 4, characterized in that: In the step 2, a furnace shell flange (8) is welded to the hot blast furnace at the drilling position, and the furnace shell flange (8) is matched with a flange cover plate (9) for sealing the hot blast furnace.

6. The online repair method for hot blast stove heat storage body collapse according to claim 4, characterized in that: In the step 2, when drilling the hot blast stove, the temperature of the drilling position is recorded in real time.

7. The online repair method for the collapse of the heat storage body of a hot blast stove according to claim 5, characterized in that: In step three, a solidified material is produced according to the temperature of the drilling position recorded in step two.

8. The online repair method for the collapse of the heat storage body of a hot blast stove according to claim 6, characterized in that: The hot blast stove drilling operation is performed multiple times on the same working platform (6), and the boundaries of the heat storage body collapse are determined by multiple drillings.

9. The online repair method for the collapse of the heat storage body of a hot blast stove according to claim 7, characterized in that: The input position of the solidified material is determined according to the area and boundary of the collapsed thermal storage body determined in the step 2. A plurality of input positions can be provided, and the plurality of input positions uniformly cover the area at the bottom of the collapsed thermal storage body.

10. The online repair method for hot blast stove heat storage body collapse according to claim 1, characterized in that: In the step 4, the new heat storage body (5) is configured to have a shape with good fluidity.

Images